From 7e41d521b6d97ba987ce5b4dfa503c0c25bc0290 Mon Sep 17 00:00:00 2001
From: Xavier Lau <xavier@inv.cafe>
Date: Sat, 24 Jun 2023 02:53:55 +0800
Subject: [PATCH] Release `v0.1.0` (#1)

---
 .github/workflows/checks.yml        |   38 +-
 .github/workflows/pages.yml         |   34 -
 .github/workflows/release.yml       |   11 +-
 .github/workflows/staging.yml       |   11 +-
 .gitignore                          |    3 +-
 Cargo.lock                          | 4352 +++++++++++++++++++++++++++
 Cargo.toml                          |   39 +-
 README.md                           |   43 +-
 build.rs                            |   18 +-
 configuration-template.toml         |  128 +
 src/hunter.rs                       |  517 ++++
 src/hunter/configuration.rs         |  254 ++
 src/hunter/graphql.rs               |  122 +
 src/hunter/node.rs                  |  176 ++
 src/hunter/notification.rs          |   67 +
 src/hunter/tx.rs                    |  169 ++
 src/hunter/util.rs                  |  240 ++
 src/lib.rs                          |    0
 src/main.rs                         |   60 +
 src/primitive.rs                    |  411 +++
 src/primitive/runtime.rs            |   43 +
 src/primitive/runtime/constant.rs   |   43 +
 src/primitive/runtime/event.rs      |   60 +
 src/primitive/runtime/storage.rs    |   19 +
 test/guide.md                       |   65 +
 test/integration/Dockerfile         |   10 +
 test/integration/docker-compose.yml |   61 +
 test/integration/rococo.toml        |  126 +
 28 files changed, 7029 insertions(+), 91 deletions(-)
 delete mode 100644 .github/workflows/pages.yml
 create mode 100644 Cargo.lock
 create mode 100644 configuration-template.toml
 create mode 100644 src/hunter.rs
 create mode 100644 src/hunter/configuration.rs
 create mode 100644 src/hunter/graphql.rs
 create mode 100644 src/hunter/node.rs
 create mode 100644 src/hunter/notification.rs
 create mode 100644 src/hunter/tx.rs
 create mode 100644 src/hunter/util.rs
 delete mode 100644 src/lib.rs
 create mode 100644 src/main.rs
 create mode 100644 src/primitive.rs
 create mode 100644 src/primitive/runtime.rs
 create mode 100644 src/primitive/runtime/constant.rs
 create mode 100644 src/primitive/runtime/event.rs
 create mode 100644 src/primitive/runtime/storage.rs
 create mode 100644 test/guide.md
 create mode 100644 test/integration/Dockerfile
 create mode 100644 test/integration/docker-compose.yml
 create mode 100644 test/integration/rococo.toml

diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index 0df7e8f..9d9f6a3 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -8,34 +8,24 @@ on:
       - main
 
 env:
+  CARGO_INCREMENTAL: 1
   CARGO_TERM_COLOR: always
 
   GITHUB_CACHE_VERSION: 1
   GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
   RUST_BACKTRACE: full
-  RUSTC_WRAPPER: sccache
-
-  SCCACHE_LINK: https://github.com/mozilla/sccache/releases/download
-  SCCACHE_VERSION: v0.3.0
-  SCCACHE_DIR: /home/runner/.cache/sccache
 
 jobs:
-  cargo_checks:
+  cargo-checks:
     name: Task cargo ${{ matrix.action }}
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        action: [clippy, nextest]
+        action: [clippy, fmt, nextest]
     steps:
       - name: Fetch latest code
         uses: actions/checkout@v3
-      - name: Install Sccache
-        run: |
-          export SCCACHE_FILE=sccache-${{ env.SCCACHE_VERSION }}-x86_64-unknown-linux-musl
-          curl -L ${{ env.SCCACHE_LINK }}/${{ env.SCCACHE_VERSION }}/$SCCACHE_FILE.tar.gz | tar xz
-          sudo mv $SCCACHE_FILE/sccache /usr/bin
-          sudo chmod u+x /usr/bin/sccache
       - name: Cache cargo
         uses: actions/cache@v3
         with:
@@ -45,24 +35,26 @@ jobs:
             target
           key: cargo-${{ env.GITHUB_CACHE_VERSION }}-${{ matrix.action }}-${{ hashFiles('**/Cargo.lock') }}
           restore-keys: cargo-${{ env.GITHUB_CACHE_VERSION }}-${{ matrix.action }}-
-      - name: Cache sccache
-        uses: actions/cache@v3
-        with:
-          path: ${{ env.SCCACHE_DIR}}
-          key: sccache-${{ env.GITHUB_CACHE_VERSION }}-${{ matrix.action }}--${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: sccache-${{ env.GITHUB_CACHE_VERSION }}-${{ matrix.action }}-
       - name: Cargo ${{ matrix.action }}
         if: matrix.action == 'clippy'
         uses: actions-rs/clippy-check@v1
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           args: --workspace --all-features --all-targets --locked
+      - name: Cargo ${{ matrix.action }}
+        if: matrix.action == 'fmt'
+        run: cargo ${{ matrix.action }} --all -- --check
       - name: Install cargo-nextest
         if: matrix.action == 'nextest'
         uses: taiki-e/install-action@nextest
-      - name: Cargo nextest
+      - name: Cargo ${{ matrix.action }}
         if: matrix.action == 'nextest'
-        uses: actions-rs/cargo@v1
+        # Skip `node-test` feature.
+        run: cargo ${{ matrix.action }} run --release --workspace --all-targets --locked
+      - name: Fast fail
+        uses: vishnudxb/cancel-workflow@v1.2
+        if: failure()
         with:
-          command: nextest
-          args: run --workspace --all-features --all-targets --locked
+          repo: hack-ink/slothunter
+          workflow_id: ${{ github.run_id }}
+          access_token: ${{ github.token }}
diff --git a/.github/workflows/pages.yml b/.github/workflows/pages.yml
deleted file mode 100644
index 936848c..0000000
--- a/.github/workflows/pages.yml
+++ /dev/null
@@ -1,34 +0,0 @@
-name: Pages
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
-
-env:
-  CARGO_TERM_COLOR: always
-
-jobs:
-  deploy:
-    name: Deploy pages
-    runs-on: ubuntu-latest
-    concurrency:
-      group: ${{ github.workflow }}-${{ github.ref }}
-    steps:
-      - name: Fetch latest code
-        uses: actions/checkout@v3
-      - name: Setup mdBook
-        uses: peaceiris/actions-mdbook@v1
-        with:
-          mdbook-version: "latest"
-      - name: Build pages
-        run: mdbook build doc
-      - name: Deploy
-        uses: peaceiris/actions-gh-pages@v3
-        if: ${{ github.ref == 'refs/heads/main' }}
-        with:
-          github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: doc/book
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index b6eebc4..256e2ad 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -30,18 +30,15 @@ jobs:
       - name: Setup Rust toolchain
         run: rustup target add ${{ matrix.target.name }}
       - name: Build
-        uses: actions-rs/cargo@v1
-        with:
-          command: build
-          args: --release --locked --target ${{ matrix.target.name }}
+        run: cargo build --release --locked --target ${{ matrix.target.name }}
       - name: Compress
         run: |
-          mv target/${{ matrix.target.name }}/release/<NAME>${{ matrix.target.extension }} .
-          zstd --ultra -22 -o <NAME>-${{ matrix.target.name }}.zst <NAME>${{ matrix.target.extension }}
+          mv target/${{ matrix.target.name }}/release/slothunter${{ matrix.target.extension }} .
+          zstd --ultra -22 -o slothunter-${{ matrix.target.name }}.zst slothunter${{ matrix.target.extension }}
       - name: Collect artifact
         run: |
           mkdir -p artifacts
-          mv <NAME>-${{ matrix.target.name }}.zst artifacts
+          mv slothunter-${{ matrix.target.name }}.zst artifacts
       - name: Upload artifact
         uses: actions/upload-artifact@v3.1.2
         with:
diff --git a/.github/workflows/staging.yml b/.github/workflows/staging.yml
index 8278e8f..71e04a8 100644
--- a/.github/workflows/staging.yml
+++ b/.github/workflows/staging.yml
@@ -28,18 +28,15 @@ jobs:
       - name: Setup Rust toolchain
         run: rustup target add ${{ matrix.target.name }}
       - name: Build
-        uses: actions-rs/cargo@v1
-        with:
-          command: build
-          args: --release --locked --target ${{ matrix.target.name }}
+        run: cargo build --release --locked --target ${{ matrix.target.name }}
       - name: Compress
         run: |
-          mv target/${{ matrix.target.name }}/release/<NAME>${{ matrix.target.extension }} .
-          zstd --ultra -22 -o <NAME>-${{ matrix.target.name }}.zst <NAME>${{ matrix.target.extension }}
+          mv target/${{ matrix.target.name }}/release/slothunter${{ matrix.target.extension }} .
+          zstd --ultra -22 -o slothunter-${{ matrix.target.name }}.zst slothunter${{ matrix.target.extension }}
       - name: Collect artifact
         run: |
           mkdir -p artifacts
-          mv <NAME>-${{ matrix.target.name }}.zst artifacts
+          mv slothunter-${{ matrix.target.name }}.zst artifacts
       - name: Upload artifact
         uses: actions/upload-artifact@v3.1.2
         with:
diff --git a/.gitignore b/.gitignore
index 261e78d..05108a7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,4 +14,5 @@ book
 index.html
 
 # Test data
-test-data
+test/integration/data
+test/integration/secret.toml
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..f06b972
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,4352 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "Inflector"
+version = "0.11.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fe438c63458706e03479442743baae6c88256498e6431708f6dfc520a26515d3"
+dependencies = [
+ "lazy_static",
+ "regex",
+]
+
+[[package]]
+name = "addr2line"
+version = "0.19.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a76fd60b23679b7d19bd066031410fb7e458ccc5e958eb5c325888ce4baedc97"
+dependencies = [
+ "gimli",
+]
+
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "ahash"
+version = "0.7.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcb51a0695d8f838b1ee009b3fbf66bda078cd64590202a864a8f3e8c4315c47"
+dependencies = [
+ "getrandom 0.2.10",
+ "once_cell",
+ "version_check",
+]
+
+[[package]]
+name = "ahash"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c99f64d1e06488f620f932677e24bc6e2897582980441ae90a671415bd7ec2f"
+dependencies = [
+ "cfg-if",
+ "getrandom 0.2.10",
+ "once_cell",
+ "version_check",
+]
+
+[[package]]
+name = "aho-corasick"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "43f6cb1bf222025340178f382c426f13757b2960e89779dfcb319c32542a5a41"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "android-tzdata"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "ansi_term"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d52a9bb7ec0cf484c551830a7ce27bd20d67eac647e1befb56b0be4ee39a55d2"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "anstream"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0ca84f3628370c59db74ee214b3263d58f9aadd9b4fe7e711fd87dc452b7f163"
+dependencies = [
+ "anstyle",
+ "anstyle-parse",
+ "anstyle-query",
+ "anstyle-wincon",
+ "colorchoice",
+ "is-terminal",
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3a30da5c5f2d5e72842e00bcb57657162cdabef0931f40e2deb9b4140440cecd"
+
+[[package]]
+name = "anstyle-parse"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "938874ff5980b03a87c5524b3ae5b59cf99b1d6bc836848df7bc5ada9643c333"
+dependencies = [
+ "utf8parse",
+]
+
+[[package]]
+name = "anstyle-query"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ca11d4be1bab0c8bc8734a9aa7bf4ee8316d462a08c6ac5052f888fef5b494b"
+dependencies = [
+ "windows-sys 0.48.0",
+]
+
+[[package]]
+name = "anstyle-wincon"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "180abfa45703aebe0093f79badacc01b8fd4ea2e35118747e5811127f926e188"
+dependencies = [
+ "anstyle",
+ "windows-sys 0.48.0",
+]
+
+[[package]]
+name = "anyhow"
+version = "1.0.71"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c7d0618f0e0b7e8ff11427422b64564d5fb0be1940354bfe2e0529b18a9d9b8"
+
+[[package]]
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+checksum = "a7e7b35733e3a8c1ccb90385088dd5b6eaa61325cb4d1ad56e683b5224ff352e"
+dependencies = [
+ "jni",
+ "ndk-context",
+ "winapi",
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+
+[[package]]
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+version = "4.2.0"
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+
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+
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+checksum = "fa24f727524730b077666307f2734b4a1a1c57acb79193127dcc8914d5242dd7"
+dependencies = [
+ "event-listener",
+]
+
+[[package]]
+name = "async-trait"
+version = "0.1.68"
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+checksum = "b9ccdd8f2a161be9bd5c023df56f1b2a0bd1d83872ae53b71a84a12c9bf6e842"
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+dependencies = [
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+ "cc",
+ "cfg-if",
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+ "rustc-demangle",
+]
+
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+
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+
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+name = "block-padding"
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+dependencies = [
+ "byte-tools",
+]
+
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+name = "bounded-collections"
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+dependencies = [
+ "log",
+ "parity-scale-codec",
+ "scale-info",
+ "serde",
+]
+
+[[package]]
+name = "bs58"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "771fe0050b883fcc3ea2359b1a96bcfbc090b7116eae7c3c512c7a083fdf23d3"
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+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
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+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
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+checksum = "e686886bc078bc1b0b600cac0147aadb815089b6e4da64016cbd754b6342700f"
+dependencies = [
+ "windows-targets 0.48.0",
+]
+
+[[package]]
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+checksum = "5a3e1820f08b8513f676f7ab6c1f99ff312fb97b553d30ff4dd86f9f15728aa7"
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+ "windows_aarch64_gnullvm 0.42.2",
+ "windows_aarch64_msvc 0.42.2",
+ "windows_i686_gnu 0.42.2",
+ "windows_i686_msvc 0.42.2",
+ "windows_x86_64_gnu 0.42.2",
+ "windows_x86_64_gnullvm 0.42.2",
+ "windows_x86_64_msvc 0.42.2",
+]
+
+[[package]]
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+ "windows-targets 0.42.2",
+]
+
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+checksum = "677d2418bec65e3338edb076e806bc1ec15693c5d0104683f2efe857f61056a9"
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+ "windows-targets 0.48.0",
+]
+
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+ "windows_aarch64_gnullvm 0.42.2",
+ "windows_aarch64_msvc 0.42.2",
+ "windows_i686_gnu 0.42.2",
+ "windows_i686_msvc 0.42.2",
+ "windows_x86_64_gnu 0.42.2",
+ "windows_x86_64_gnullvm 0.42.2",
+ "windows_x86_64_msvc 0.42.2",
+]
+
+[[package]]
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+ "windows_aarch64_gnullvm 0.48.0",
+ "windows_aarch64_msvc 0.48.0",
+ "windows_i686_gnu 0.48.0",
+ "windows_i686_msvc 0.48.0",
+ "windows_x86_64_gnu 0.48.0",
+ "windows_x86_64_gnullvm 0.48.0",
+ "windows_x86_64_msvc 0.48.0",
+]
+
+[[package]]
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+
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+
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+
+[[package]]
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+checksum = "c61d927d8da41da96a81f029489353e68739737d3beca43145c8afec9a31a84f"
+
+[[package]]
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+checksum = "622a1962a7db830d6fd0a69683c80a18fda201879f0f447f065a3b7467daa241"
+
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+
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+
+[[package]]
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+
+[[package]]
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+checksum = "26d41b46a36d453748aedef1486d5c7a85db22e56aff34643984ea85514e94a3"
+
+[[package]]
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+checksum = "7896dbc1f41e08872e9d5e8f8baa8fdd2677f29468c4e156210174edc7f7b953"
+
+[[package]]
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+version = "0.42.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9aec5da331524158c6d1a4ac0ab1541149c0b9505fde06423b02f5ef0106b9f0"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.48.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1a515f5799fe4961cb532f983ce2b23082366b898e52ffbce459c86f67c8378a"
+
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+version = "0.4.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ca0ace3845f0d96209f0375e6d367e3eb87eb65d27d445bdc9f1843a26f39448"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "winreg"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80d0f4e272c85def139476380b12f9ac60926689dd2e01d4923222f40580869d"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "wyz"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "05f360fc0b24296329c78fda852a1e9ae82de9cf7b27dae4b7f62f118f77b9ed"
+dependencies = [
+ "tap",
+]
+
+[[package]]
+name = "xdg"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "688597db5a750e9cad4511cb94729a078e274308099a0382b5b8203bbc767fee"
+dependencies = [
+ "home",
+]
+
+[[package]]
+name = "yap"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2a7eb6d82a11e4d0b8e6bda8347169aff4ccd8235d039bba7c47482d977dcf7"
+
+[[package]]
+name = "zeroize"
+version = "1.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a0956f1ba7c7909bfb66c2e9e4124ab6f6482560f6628b5aaeba39207c9aad9"
+dependencies = [
+ "zeroize_derive",
+]
+
+[[package]]
+name = "zeroize_derive"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce36e65b0d2999d2aafac989fb249189a141aee1f53c612c1f37d72631959f69"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.18",
+]
diff --git a/Cargo.toml b/Cargo.toml
index 5cf288e..944b2b4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,11 +1,42 @@
 [package]
 authors     = ["Xavier Lau <xavier@inv.cafe>"]
 build       = "build.rs"
-description = "<DESCRIPTION>"
+description = "A bot for Polkadot parachain auction."
 edition     = "2021"
-homepage    = "https://<NAME>.hack.ink"
+homepage    = "https://slothunter.hack.ink"
 license     = "GPL-3.0"
-name        = "<NAME>"
+name        = "slothunter"
 readme      = "README.md"
-repository  = "https://github.com/hack-ink/<NAME>"
+repository  = "https://github.com/hack-ink/slothunter"
 version     = "0.1.0"
+
+[features]
+node-test = []
+
+[build-dependencies]
+# crates.io
+vergen = { version = "8.2", features = ["build", "cargo", "git", "gitcl"] }
+
+[dependencies]
+# crates.io
+anyhow             = { version = "1.0" }
+app_dirs2          = { version = "2.5" }
+array-bytes        = { version = "6.1" }
+clap               = { version = "4.3", features = ["derive"] }
+color-eyre         = { version = "0.6" }
+futures            = { version = "0.3" }
+lettre             = { version = "0.10" }
+parity-scale-codec = { version = "3.6" }
+regex              = { version = "1.8" }
+reqwest            = { version = "0.11", features = ["json"] }
+scale-decode       = { version = "0.7" }
+scale-value        = { version = "0.10" }
+serde              = { version = "1.0", features = ["derive"] }
+serde_json         = { version = "1.0" }
+sp-core            = { version = "21.0" }
+sp-runtime         = { version = "24.0" }
+subxt              = { version = "0.29" }
+tokio              = { version = "1.28", features = ["macros", "rt-multi-thread"] }
+toml               = { version = "0.7" }
+tracing            = { version = "0.1" }
+tracing-subscriber = { version = "0.3" }
diff --git a/README.md b/README.md
index 00d358c..9b35a21 100644
--- a/README.md
+++ b/README.md
@@ -1,13 +1,42 @@
 <div align="center">
 
-# \<NAME\>
-### \<DESCRIPTION\>
+# Slothunter
+### A bot for Polkadot parachain auction.
 
 [![License](https://img.shields.io/badge/License-GPLv3-blue.svg)](https://www.gnu.org/licenses/gpl-3.0)
-[![Checks](https://github.com/hack-ink/<NAME>/actions/workflows/checks.yml/badge.svg?branch=main)](https://github.com/hack-ink/<NAME>/actions/workflows/checks.yml)
-[![Release](https://github.com/hack-ink/<NAME>/actions/workflows/release.yml/badge.svg)](https://github.com/hack-ink/<NAME>/actions/workflows/release.yml)
-[![GitHub tag (latest by date)](https://img.shields.io/github/v/tag/hack-ink/<NAME>)](https://github.com/hack-ink/<NAME>/tags)
-[![GitHub code lines](https://tokei.rs/b1/github/hack-ink/<NAME>)](https://github.com/hack-ink/<NAME>)
-[![GitHub last commit](https://img.shields.io/github/last-commit/hack-ink/<NAME>?color=red&style=plastic)](https://github.com/hack-ink/<NAME>)
+[![Checks](https://github.com/hack-ink/slothunter/actions/workflows/checks.yml/badge.svg?branch=main)](https://github.com/hack-ink/slothunter/actions/workflows/checks.yml)
+[![Release](https://github.com/hack-ink/slothunter/actions/workflows/release.yml/badge.svg)](https://github.com/hack-ink/slothunter/actions/workflows/release.yml)
+[![GitHub tag (latest by date)](https://img.shields.io/github/v/tag/hack-ink/slothunter)](https://github.com/hack-ink/slothunter/tags)
+[![GitHub code lines](https://tokei.rs/b1/github/hack-ink/slothunter)](https://github.com/hack-ink/slothunter)
+[![GitHub last commit](https://img.shields.io/github/last-commit/hack-ink/slothunter?color=red&style=plastic)](https://github.com/hack-ink/slothunter)
 
 </div>
+
+## Usage
+```sh
+# Use `--help` flag to get more information.
+slothunter --help
+```
+
+### Configuration
+To create a template configuration file for the program, run it directly for the first time and use the command below.
+After that, press `CTRL-C`.
+```sh
+slothunter
+# Or
+slothunter -c config.toml
+```
+
+If a path is provided, it will create the configuration file at that location.
+Otherwise, Slothunter will create the configuration file at the default path.
+The default paths are:
+```
+Linux:   /home/alice/.config/slothunter
+Windows: C:\Users\Alice\AppData\Roaming\slothunter
+MacOS:   /Users/Alice/Library/Application Support/slothunter
+```
+
+Open the configuration file and edit the items. The file contains highly detailed documentation for each item.
+
+### Addition
+For more details, please refer to [guide.md](test/guide.md).
diff --git a/build.rs b/build.rs
index f6072f5..5f8f3b2 100644
--- a/build.rs
+++ b/build.rs
@@ -1,17 +1,19 @@
 // crates.io
-use vergen::{Config, ShaKind};
+use vergen::EmitBuilder;
 
 fn main() {
-	let mut config = Config::default();
+	let mut emitter = EmitBuilder::builder();
 
-	*config.git_mut().sha_kind_mut() = ShaKind::Short;
+	emitter.cargo_target_triple();
 
 	// Disable the git version if installed from <crates.io>.
-	if vergen::vergen(config.clone()).is_err() {
-		*config.git_mut().enabled_mut() = false;
+	if emitter.clone().git_sha(true).fail_on_error().emit().is_err() {
+		println!("cargo:rustc-env=VERGEN_GIT_SHA=crates.io");
 
-		println!("cargo:rustc-env=VERGEN_GIT_SHA_SHORT=crates.io");
-
-		vergen::vergen(config).unwrap();
+		emitter
+	} else {
+		*emitter.git_sha(true)
 	}
+	.emit()
+	.unwrap();
 }
diff --git a/configuration-template.toml b/configuration-template.toml
new file mode 100644
index 0000000..e8f7a88
--- /dev/null
+++ b/configuration-template.toml
@@ -0,0 +1,128 @@
+# Relaychain network.
+#
+# Possible values: "kusama", "polkadot".
+network = "polkadot"
+# GraphQL HTTP(S) URI.
+#
+# This line can be commented out. Otherwise, it will replace the default URI of `network`.
+# graphql-endpoint = "http://127.0.0.1:3000/graphql"
+# Network WS(S) URI.
+#
+# This line can be commented out. Otherwise, it will replace the default URI of `network`.
+# node-endpoint = "ws://127.0.0.1:9944"
+# Block subscription mode.
+#
+# Possible values: "best", "finalized".
+#
+# best: Subscribe to the best block, this strategy is faster and can increase your chances of
+# winning the auction, but it becomes unsafe if there is a fork.
+#
+# finalized: Subscribe to the latest finalized block.
+block-subscription-mode = "finalized"
+
+[bid]
+# Parachain's identity you are bidding for.
+para-id = 2000
+# Lease(s) you are bidding for.
+#
+# E.G.
+# Bid for 8 leases.
+# Example values: [0, 7], [10, 17], [100, 107]
+leases = [0, 0]
+# Bidding type.
+#
+# Possible values: "self-funded", "crowdloan".
+type = "self-funded"
+# The real account's public key.
+#
+# E.G.
+# Secret Key URI `//Alice` is account:
+#   Network ID:        substrate
+#  Secret seed:       0xe5be9a5092b81bca64be81d212e7f2f9eba183bb7a90954f7b76361f6edb5c0a
+#   Public key (hex):  0xd43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d
+#   Account ID:        0xd43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d
+#   Public key (SS58): 5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY
+#   SS58 Address:      5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY
+real = "0xd43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d"
+# Delegate/proxy account's private key/seed.
+#
+# For better safety, Slothunter only allows the use of delegate/proxy accounts for bidding/contributing.
+#
+# E.G.
+# Secret Key URI `//Bob` is account:
+#   Network ID:        substrate
+#  Secret seed:       0x398f0c28f98885e046333d4a41c19cee4c37368a9832c6502f6cfd182e2aef89
+#   Public key (hex):  0x8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a48
+#   Account ID:        0x8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a48
+#   Public key (SS58): 5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty
+#   SS58 Address:      5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty
+delegate = "0x398f0c28f98885e046333d4a41c19cee4c37368a9832c6502f6cfd182e2aef89"
+# Upper limit of the bids.
+#
+# Slothunter will stop bidding if the minimum winning amount exceeds this value.
+#
+# Generally, this value should be equal to or greater than the increment.
+upper-limit = "1000000000000000"
+# Bid increment.
+#
+# This should be at least 1 DOT/KSM.
+#
+# Generally, the minimum value(1 DOT/KSM) should help you win the auction.
+# However, if there are a lot of Slothunters or someone bids at the same time, you may lose the auction.
+# To increase your chances of winning, consider increasing this value.
+#
+# Note that this value will serve as the default bid for the first bidder in case there are no other bidders.
+#
+# E.G.
+# A  : (0, 3) -> 10
+# B  : (0, 1) -> 10
+# C  : (2, 2) -> 5
+# D  : (1, 3) -> 11
+# E  : (3, 3) -> 16
+# You: (1, 2) -> x
+#
+# Current winners are `B`, `C`, and `E`, the threshold is calculated as `2 * 10 + 5 + 16 = 41`.
+# Slothunter will calculate the value of `x` which is equal to `12` and then bid with the amount of `(x + increment)`.
+# The calculation for winning the bid would be: `(x(12) + increment(1)) * 2 + 16 = 42 > 41`, hence, win.
+# Since DOT's decimals are ten, there should be ten zeros here.
+increment = "10000000000"
+
+[notification]
+# Notification webhooks.
+#
+# Periodic notification will be sent to the following webhook addresses.
+#
+# If you don't wish to use any webhooks, leave this field empty.
+#
+# E.G.
+# This can be integrated into:
+# - A Discord channel using a Discord webhook.
+# - A Telegram channel using a Telegram bot.
+# - A Slack channel using a Slack webhook.
+webhooks = [
+	# "https://example.com/webhook",
+	# "https://example.com/webhook1",
+	# "https://example.com/webhook2",
+]
+# Notification mail configurations.
+#
+# If you don't wish to use any mail notifications, keep this(`[notification.mail]`) whole section commented out.
+[notification.mail]
+# Notification will be sent to the following recipients.
+# receivers = [
+# 	"example1@gmail.com",
+# 	"example2@gmail.com",
+# 	"example@gmail.com",
+# ]
+# [notification.mail.sender]
+# Sender's mail password:
+# Note:
+#   This is usually an app-specific password instead of your account password.
+#   For example, you can generate an app-spceific password by following the instructions provided in this link: https://support.google.com/accounts/answer/185833?hl=en.
+# password = "google mail app password"
+# Sender's mail address.
+# username = "example@gmail.com"
+# SMTP server address.
+#
+# The default value is the SMTP server address of Gmail.
+# stmp = "smtp.gmail.com"
diff --git a/src/hunter.rs b/src/hunter.rs
new file mode 100644
index 0000000..b07c830
--- /dev/null
+++ b/src/hunter.rs
@@ -0,0 +1,517 @@
+pub mod util;
+
+mod configuration;
+pub use configuration::*;
+
+mod graphql;
+pub use graphql::*;
+
+mod node;
+pub use node::*;
+
+mod notification;
+pub use notification::*;
+
+mod tx;
+pub use tx::*;
+
+pub use crate::prelude::*;
+
+// std
+use std::mem;
+// crates.io
+use futures::StreamExt;
+use reqwest::Client;
+use scale_value::ValueDef;
+#[cfg(feature = "node-test")] use sp_core::{sr25519::Pair, Pair as _};
+#[cfg(feature = "node-test")] use subxt::tx::PairSigner;
+use subxt::{config::polkadot::H256, OnlineClient, PolkadotConfig};
+
+type BlockStream = std::pin::Pin<
+	Box<dyn Send + futures::Stream<Item = std::result::Result<Block, subxt::error::Error>>>,
+>;
+type Block =
+	subxt::blocks::Block<subxt::PolkadotConfig, subxt::OnlineClient<subxt::PolkadotConfig>>;
+
+#[derive(Debug)]
+pub struct Hunter {
+	pub configuration: Configuration,
+	pub http: Client,
+	pub node: OnlineClient<PolkadotConfig>,
+	pub auction: Option<AuctionDetail>,
+	pub auction_ending_period: BlockNumber,
+	pub auction_sample_length: BlockNumber,
+	pub auction_is_open: bool,
+	pub bidder: AccountId,
+}
+impl Hunter {
+	#[allow(unused)]
+	#[cfg(feature = "node-test")]
+	async fn tester() -> Self {
+		let configuration = Configuration {
+			graphql_endpoint: "http://127.0.0.1:3000/graphql".into(),
+			node_endpoint: "ws://127.0.0.1:9944".into(),
+			block_subscription_mode: BlockSubscriptionMode::Best,
+			token: Token { symbol: "UNIT", decimals: 12. },
+			bid: Bid {
+				para_id: 2000,
+				leases: (0, 0),
+				watch_only: false,
+				r#type: BidType::SelfFunded,
+				real: array_bytes::hex2array_unchecked(
+					"0xd43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d",
+				),
+				delegate: PairSigner::new(Pair::from_seed(&array_bytes::hex2array_unchecked(
+					"0x3c881bc4d45926680c64a7f9315eeda3dd287f8d598f3653d7c107799c5422b3",
+				))),
+				upper_limit: 100_000_000_000_000,
+				increment: 1_000_000_000_000,
+			},
+			notification: Notification { mail: None, webhooks: Vec::new() },
+		};
+		let node = OnlineClient::from_url(&configuration.node_endpoint).await.unwrap();
+
+		Self {
+			configuration,
+			http: util::http_json_client(),
+			node,
+			auction: None,
+			auction_ending_period: 0,
+			auction_sample_length: 0,
+			auction_is_open: false,
+			bidder: AccountId::default(),
+		}
+	}
+
+	fn watch_only(&self) -> bool {
+		self.configuration.bid.watch_only
+	}
+
+	fn is_self_funded(&self) -> bool {
+		self.configuration.bid.r#type == BidType::SelfFunded
+	}
+
+	fn can_spend(&self, value: Balance) -> bool {
+		self.configuration.bid.upper_limit >= value
+	}
+
+	fn is_bidder(&self, who: &AccountId, para_id: ParaId) -> bool {
+		who == &self.bidder && para_id == self.configuration.bid.para_id
+	}
+
+	fn is_winner(&self, winners: &[Winner]) -> bool {
+		winners.iter().any(|w| self.is_bidder(&w.who, w.para_id))
+	}
+
+	pub async fn start(&mut self) -> Result<()> {
+		let mut block_stream = self.initialize().await?;
+		let mut has_bid = false;
+
+		loop {
+			let block = if has_bid {
+				tracing::info!("skip 1 block after tendering");
+
+				has_bid = false;
+
+				Self::next_block(&mut block_stream).await?;
+
+				Self::next_block(&mut block_stream).await?
+			} else {
+				Self::next_block(&mut block_stream).await?
+			};
+			let block_height = block.number();
+			let block_hash = block.hash();
+
+			tracing::info!("block(#{block_height}, {block_hash:?})");
+
+			self.update(&block_hash).await?;
+			self.hunt(block_height, block_hash, &mut has_bid).await?;
+		}
+	}
+
+	async fn initialize(&mut self) -> Result<BlockStream> {
+		self.auction_ending_period = self.auction_ending_period().await?;
+		self.auction_sample_length = self.auction_sample_length().await?;
+
+		let mut block_stream = match self.configuration.block_subscription_mode {
+			BlockSubscriptionMode::Best => self.node.blocks().subscribe_best().await?,
+			BlockSubscriptionMode::Finalized => self.node.blocks().subscribe_finalized().await?,
+		};
+		let block_hash = Self::next_block(&mut block_stream).await?.hash();
+
+		self.check(&block_hash).await?;
+
+		self.auction = self.auction_at(&block_hash).await?;
+		self.auction_is_open = self.auction.is_some();
+		self.bidder = if self.is_self_funded() {
+			self.configuration.bid.real
+		} else {
+			util::crowdloan_id_of(self.fund_index_at(&block_hash).await?.expect(&format!(
+				"no existing crowdloan found for parachain({})",
+				self.configuration.bid.para_id,
+			)))
+		};
+
+		Ok(block_stream)
+	}
+
+	async fn next_block(block_stream: &mut BlockStream) -> Result<Block> {
+		Ok(block_stream.next().await.ok_or(anyhow::anyhow!("failed to get the next block"))??)
+	}
+
+	async fn check(&self, block_hash: &H256) -> Result<()> {
+		tracing::info!("############################################################");
+
+		{
+			let uri = &self.configuration.node_endpoint;
+
+			if util::check_ws_uri(uri) {
+				tracing::info!("node endpoint({uri})");
+			} else {
+				panic!("invalid node endpoint({uri})");
+			}
+		}
+
+		{
+			let uri = &self.configuration.graphql_endpoint;
+
+			if util::check_http_uri(uri) {
+				tracing::info!("graphql endpoint({uri})");
+			} else {
+				panic!("invalid graphql endpoint({uri})");
+			}
+		}
+
+		tracing::info!("bid");
+		tracing::info!("  hunting a slot for parachain({})", self.configuration.bid.para_id);
+		tracing::info!("  watch-only({})", self.watch_only());
+
+		if !self.watch_only() {
+			const E_DELEGATE: &str = "no delegate(`ProxyType::All` or `ProxyType::Auction`) found, please check your configurations";
+
+			tracing::info!("  funding type({})", self.configuration.bid.r#type);
+
+			let real = &self.configuration.bid.real;
+			let delegate = self.configuration.bid.delegate.account_id();
+
+			tracing::info!("  real account({})", array_bytes::bytes2hex("0x", real));
+			tracing::info!("  proxy delegate({})", array_bytes::bytes2hex("0x", delegate.0));
+
+			let ValueDef::Variant(v) = self
+				.proxies_at(block_hash, real)
+				.await?
+				.expect(E_DELEGATE)
+				.into_iter()
+				.find(|p| p.delegate.r#type == delegate.0)
+				.expect(E_DELEGATE)
+				.proxy_type
+				.value else { panic!("{E_DELEGATE}") };
+
+			if !matches!(v.name.as_str(), "All" | "Auction") {
+				panic!("{E_DELEGATE}")
+			}
+
+			tracing::info!("  proxy type({})", v.name);
+			tracing::info!(
+				"  upper limit {}",
+				self.configuration.token.fmt(self.configuration.bid.upper_limit)
+			);
+
+			let increment = self.configuration.bid.increment;
+
+			tracing::info!("  increment {}", self.configuration.token.fmt(increment));
+
+			assert!(
+				increment as f64 / 10_f64.powf(self.configuration.token.decimals) >= 1.,
+				"increment should be at least {}(1)",
+				self.configuration.token.symbol
+			);
+		}
+
+		tracing::info!("notification");
+		tracing::info!("  webhooks");
+
+		self.configuration.notification.webhooks.iter().for_each(|u| {
+			tracing::info!("    uri({})", u);
+		});
+
+		if let Some(m) = &self.configuration.notification.mail {
+			tracing::info!("  mail");
+			tracing::info!("    sender({})", m.sender.username.email);
+
+			if util::check_smtp_uri(&m.sender.smtp) {
+				tracing::info!("    smtp({})", m.sender.smtp);
+			} else {
+				panic!("invalid smtp({})", m.sender.smtp);
+			}
+
+			for to in &m.receivers {
+				tracing::info!("    receiver({})", to.email);
+			}
+		}
+
+		tracing::info!("############################################################");
+
+		Ok(())
+	}
+
+	async fn update(&mut self, block_hash: &H256) -> Result<()> {
+		let previous_auction = {
+			let auction = self.auction_at(block_hash).await?;
+
+			mem::replace(&mut self.auction, auction)
+		};
+
+		self.auction_is_open = match (self.auction_is_open, self.auction.is_some()) {
+			// An auction has just been opened.
+			(false, true) => {
+				let a = self.auction.as_ref().expect("`self.auction` must be some");
+
+				self.notify_mail(a, "auction has just been started");
+				self.notify_webhook(a, "auction has just been started").await;
+
+				true
+			},
+			// An auction has just been closed.
+			(true, false) => {
+				let a = previous_auction.expect("`previous_auction` must be some");
+
+				self.notify_mail(&a, "auction has just been closed");
+				self.notify_webhook(&a, "auction has just been closed").await;
+
+				false
+			},
+			// Still in/not in an auction.
+			(_, is_some) => is_some,
+		};
+
+		Ok(())
+	}
+
+	async fn hunt(
+		&self,
+		block_height: BlockNumber,
+		block_hash: H256,
+		has_bid: &mut bool,
+	) -> Result<()> {
+		let Some(auction) = &self.auction else { return Ok(()) };
+		let end_at = auction.ending_period_start_at + self.auction_ending_period;
+
+		if end_at <= block_height {
+			return Ok(());
+		}
+
+		tracing::info!("  {}", auction.fmt(block_height, end_at));
+
+		let Some(self_bid) = self.analyze_bidders(&block_hash, auction, has_bid).await? else { return Ok(()); };
+		let Some(winning) = self.analyze_winning(
+			&block_hash,
+			block_height,
+			auction,
+		).await? else { return Ok(()); };
+
+		self.analyze_winners(block_height, &block_hash, auction, &winning, self_bid, has_bid).await
+	}
+
+	async fn analyze_bidders(
+		&self,
+		block_hash: &H256,
+		auction: &AuctionDetail,
+		has_bid: &mut bool,
+	) -> Result<Option<Balance>> {
+		tracing::info!("    bidders");
+
+		let bidders = self.bidders_at(block_hash).await?;
+
+		if bidders.is_empty() {
+			tracing::info!("      no bidders were found");
+
+			self.try_tender(auction.index, self.configuration.bid.increment, 0).await?;
+
+			*has_bid = true;
+
+			return Ok(None);
+		}
+
+		let mut self_bid = 0;
+
+		bidders.into_iter().for_each(|b| {
+			tracing::info!("      {}", b.fmt(&self.configuration.token));
+
+			if let Some(l) = &b.last_accepted_bid {
+				tracing::info!("        last accepted bid is {}", l.fmt(&self.configuration.token));
+
+				if self.is_bidder(&b.who, b.para_id) {
+					self_bid = l.amount;
+				}
+			}
+		});
+
+		Ok(Some(self_bid))
+	}
+
+	async fn analyze_winning(
+		&self,
+		block_hash: &H256,
+		block_height: BlockNumber,
+		auction: &AuctionDetail,
+	) -> Result<Option<Winning>> {
+		tracing::info!("    winning");
+
+		let winning = self
+			.winning_at(block_hash, block_height, auction.ending_period_start_at)
+			.await?
+			.expect("winning must be some if bidders is not empty");
+
+		if winning.0.iter().all(Option::is_none) {
+			tracing::info!("      no winning has been calculated yet");
+
+			return Ok(None);
+		}
+
+		winning
+			.fmt(&self.configuration.token, auction.first_lease_period)
+			.into_iter()
+			.for_each(|w| tracing::info!("      {w}"));
+
+		Ok(Some(winning))
+	}
+
+	async fn analyze_winners(
+		&self,
+		block_height: BlockNumber,
+		block_hash: &H256,
+		auction: &AuctionDetail,
+		winning: &Winning,
+		self_bid: Balance,
+		has_bid: &mut bool,
+	) -> Result<()> {
+		tracing::info!("    winner(s)");
+
+		let (winners, threshold) = winning.result();
+		let notification = winners
+			.iter()
+			.map(|w| {
+				let n = w.fmt(&self.configuration.token, auction.first_lease_period);
+
+				tracing::info!("      {n}");
+
+				n
+			})
+			.collect::<Vec<_>>()
+			.join(",");
+
+		self.notify_webhook(
+			&serde_json::json!({
+				"block": {
+					"height": block_height,
+					"hash": block_hash,
+				},
+				"winning": winning.0.as_slice(),
+				"winners": winners,
+
+			}),
+			&format!("at block(#{block_height}, {block_hash:?})\n{notification}"),
+		)
+		.await;
+
+		if !self.is_winner(&winners) {
+			let leases = (
+				self.configuration.bid.leases.0 - auction.first_lease_period,
+				self.configuration.bid.leases.1 - auction.first_lease_period,
+			);
+			let bid =
+				winning.minimum_bid_to_win(&leases, threshold) + self.configuration.bid.increment;
+
+			self.try_tender(auction.index, bid, self_bid).await?;
+
+			*has_bid = true;
+		}
+
+		Ok(())
+	}
+
+	async fn try_tender(&self, auction_index: u32, bid: Balance, self_bid: Balance) -> Result<()> {
+		if self.watch_only() {
+			fn log(mode: &str, bid: String) {
+				tracing::warn!("    slothunter is running under the watch-only mode, {mode} {bid} manually to win");
+			}
+
+			if self.is_self_funded() {
+				log("bid", self.configuration.token.fmt(bid))
+			} else {
+				log("contribute", self.configuration.token.fmt(bid - self_bid))
+			}
+
+			Ok(())
+		} else {
+			fn log(mode: &str, bid: String, upper_limit: String) -> String {
+				format!("    skip {mode} {bid} because it exceeds the upper limit {upper_limit}")
+			}
+
+			let notification;
+
+			if self.is_self_funded() {
+				if self.can_spend(bid) {
+					if let Err(e) = self.bid(auction_index, bid).await? {
+						let n = format!("    bid failed due to error({e:?})");
+
+						tracing::error!("{n}");
+
+						notification = n.trim_start_matches(' ').to_string();
+					} else {
+						let n = format!("    bid with {}", self.configuration.token.fmt(bid));
+
+						tracing::info!("{n}");
+
+						notification = n.trim_start_matches(' ').to_string();
+					}
+				} else {
+					let n = log(
+						"bidding",
+						self.configuration.token.fmt(bid),
+						self.configuration.token.fmt(self.configuration.bid.upper_limit),
+					);
+
+					tracing::warn!("{n}");
+
+					notification = n.trim_start_matches(' ').to_string();
+				}
+			} else {
+				let bid = bid - self_bid;
+
+				if self.can_spend(bid) {
+					if let Err(e) = self.contribute(bid).await? {
+						let n = format!("    contribute failed due to error({e:?})");
+
+						tracing::error!("{n}");
+
+						notification = n.trim_start_matches(' ').to_string();
+					} else {
+						let n =
+							format!("    contribute with {}", self.configuration.token.fmt(bid));
+
+						tracing::info!("{n}");
+
+						notification = n.trim_start_matches(' ').to_string();
+					}
+				} else {
+					let n = log(
+						"contributing",
+						self.configuration.token.fmt(bid),
+						self.configuration.token.fmt(self.configuration.bid.upper_limit),
+					);
+
+					tracing::warn!("{n}");
+
+					notification = n.trim_start_matches(' ').to_string();
+				}
+			}
+
+			self.notify_mail(&None::<()>, &notification);
+			self.notify_webhook(&None::<()>, &notification).await;
+
+			Ok(())
+		}
+	}
+}
diff --git a/src/hunter/configuration.rs b/src/hunter/configuration.rs
new file mode 100644
index 0000000..6191181
--- /dev/null
+++ b/src/hunter/configuration.rs
@@ -0,0 +1,254 @@
+// std
+use std::{
+	fmt::{Debug, Display, Formatter, Result as FmtResult},
+	fs,
+	path::PathBuf,
+};
+// crates.io
+use app_dirs2::{AppDataType, AppInfo};
+use serde::Deserialize;
+use sp_core::{sr25519::Pair, Pair as _};
+use subxt::tx::PairSigner;
+// slothunter
+use crate::hunter::*;
+
+pub const SLOTHUNTER: AppInfo = AppInfo { name: "slothunter", author: "Xavier Lau" };
+
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub struct ConfigurationToml {
+	pub network: Network,
+	pub graphql_endpoint: Option<String>,
+	pub node_endpoint: Option<String>,
+	pub block_subscription_mode: BlockSubscriptionMode,
+	pub bid: BidToml,
+	pub notification: NotificationToml,
+}
+impl ConfigurationToml {
+	pub fn load(path: Option<PathBuf>) -> Result<Self> {
+		fn initialize(path: &PathBuf) -> Result<ConfigurationToml> {
+			if !path.is_file() {
+				let s = include_str!("../../configuration-template.toml");
+
+				fs::write(path, s)?;
+
+				Ok(toml::from_str(s)?)
+			} else {
+				Ok(toml::from_str(&fs::read_to_string(path)?)?)
+			}
+		}
+
+		let path = path.unwrap_or(app_dirs2::app_root(AppDataType::UserConfig, &SLOTHUNTER)?);
+
+		if matches!(path.extension().map(|s| s.to_str().unwrap_or_default()), Some("toml")) {
+			return initialize(&path);
+		}
+		if !path.is_dir() {
+			fs::create_dir_all(&path)?;
+		}
+
+		let path = path.join("config.toml");
+
+		initialize(&path)
+	}
+
+	pub fn try_into_configuration(self) -> Result<Configuration> {
+		let Self {
+			network,
+			graphql_endpoint,
+			node_endpoint,
+			block_subscription_mode,
+			bid:
+				BidToml { para_id, leases, watch_only, r#type, real, delegate, upper_limit, increment },
+			notification: NotificationToml { mail, webhooks },
+		} = self;
+		let graphql_endpoint =
+			graphql_endpoint.unwrap_or_else(|| network.graphql_endpoint().to_owned());
+		let node_endpoint = node_endpoint.unwrap_or_else(|| network.node_endpoint().to_owned());
+
+		Ok(Configuration {
+			graphql_endpoint,
+			node_endpoint,
+			block_subscription_mode,
+			token: network.token(),
+			bid: Bid {
+				para_id,
+				leases,
+				watch_only,
+				r#type,
+				real: array_bytes::hex2array(real)
+					.map_err(|e| anyhow::anyhow!("invalid public key, {e:?}"))?,
+				delegate: PairSigner::new(Pair::from_seed(
+					&array_bytes::hex2array(delegate)
+						.map_err(|e| anyhow::anyhow!("invalid seed, {e:?}"))?,
+				)),
+				upper_limit: upper_limit.parse()?,
+				increment: increment.parse()?,
+			},
+			notification: Notification {
+				mail: mail
+					.map(|m| -> Result<_> {
+						Ok(Mail {
+							sender: Sender {
+								username: m.sender.username.parse()?,
+								password: m.sender.password,
+								smtp: m.sender.smtp,
+							},
+							receivers: m
+								.receivers
+								.into_iter()
+								.map(|r| r.parse())
+								.collect::<StdResult<_, _>>()?,
+						})
+					})
+					.transpose()?,
+				webhooks,
+			},
+		})
+	}
+}
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub struct BidToml {
+	pub para_id: ParaId,
+	pub leases: SlotRange,
+	pub watch_only: bool,
+	pub r#type: BidType,
+	pub real: String,
+	pub delegate: String,
+	pub upper_limit: String,
+	pub increment: String,
+}
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub struct NotificationToml {
+	pub mail: Option<MailToml>,
+	pub webhooks: Vec<String>,
+}
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub struct MailToml {
+	pub sender: SenderToml,
+	pub receivers: Vec<String>,
+}
+#[derive(Debug, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub struct SenderToml {
+	pub username: String,
+	pub password: String,
+	pub smtp: String,
+}
+
+#[derive(Debug)]
+pub struct Configuration {
+	pub graphql_endpoint: String,
+	pub node_endpoint: String,
+	pub block_subscription_mode: BlockSubscriptionMode,
+	pub token: Token,
+	pub bid: Bid,
+	pub notification: Notification,
+}
+pub struct Bid {
+	pub para_id: ParaId,
+	pub leases: SlotRange,
+	pub watch_only: bool,
+	pub r#type: BidType,
+	pub real: AccountId,
+	pub delegate: PairSigner<PolkadotConfig, Pair>,
+	pub upper_limit: Balance,
+	pub increment: Balance,
+}
+impl Debug for Bid {
+	fn fmt(&self, f: &mut Formatter) -> FmtResult {
+		f.debug_struct("Configuration")
+			.field("para_id", &self.para_id)
+			.field("real", &array_bytes::bytes2hex("0x", self.real))
+			.field("type", &self.r#type)
+			.field("delegate", &self.delegate.account_id())
+			.finish()
+	}
+}
+#[derive(Debug)]
+pub struct Notification {
+	pub mail: Option<Mail>,
+	pub webhooks: Vec<String>,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub enum BlockSubscriptionMode {
+	Best,
+	Finalized,
+}
+
+#[derive(Clone, Debug, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub enum Network {
+	Polkadot,
+	Kusama,
+}
+impl Network {
+	pub fn graphql_endpoint(&self) -> &'static str {
+		match self {
+			Self::Polkadot => "https://polkadot.explorer.subsquid.io/graphql",
+			Self::Kusama => "https://kusama.explorer.subsquid.io/graphql",
+		}
+	}
+
+	pub fn node_endpoint(&self) -> &'static str {
+		match self {
+			Self::Polkadot => "wss://rpc.polkadot.io:443",
+			Self::Kusama => "wss://kusama-rpc.polkadot.io:443",
+		}
+	}
+
+	pub fn token(&self) -> Token {
+		match self {
+			Self::Polkadot => Token { symbol: "DOT", decimals: 10. },
+			Self::Kusama => Token { symbol: "KSM", decimals: 12. },
+		}
+	}
+}
+
+#[derive(Debug, PartialEq, Eq, Deserialize)]
+#[serde(rename_all = "kebab-case")]
+pub enum BidType {
+	SelfFunded,
+	Crowdloan,
+}
+impl Display for BidType {
+	fn fmt(&self, f: &mut Formatter) -> FmtResult {
+		match self {
+			Self::SelfFunded => write!(f, "self-funded"),
+			Self::Crowdloan => write!(f, "crowdloan"),
+		}
+	}
+}
+
+#[derive(Debug)]
+pub struct Token {
+	pub symbol: &'static str,
+	pub decimals: f64,
+}
+impl Token {
+	pub fn fmt(&self, balance: Balance) -> String {
+		format!("{}({})", self.symbol, balance as f64 / 10_f64.powf(self.decimals))
+	}
+}
+
+impl Hunter {
+	pub async fn from_configuration(configuration: Configuration) -> Result<Self> {
+		let node = OnlineClient::from_url(&configuration.node_endpoint).await?;
+
+		Ok(Self {
+			configuration,
+			http: util::http_json_client(),
+			node,
+			auction: None,
+			auction_ending_period: 0,
+			auction_sample_length: 0,
+			auction_is_open: false,
+			bidder: AccountId::default(),
+		})
+	}
+}
diff --git a/src/hunter/graphql.rs b/src/hunter/graphql.rs
new file mode 100644
index 0000000..ceabd0d
--- /dev/null
+++ b/src/hunter/graphql.rs
@@ -0,0 +1,122 @@
+// std
+use std::fmt::{Display, Formatter, Result as FmtResult};
+// crates.io
+use serde::de::DeserializeOwned;
+// slothunter
+use crate::hunter::*;
+
+#[derive(Debug)]
+pub struct Query<'a> {
+	pub limit: u32,
+	pub name: &'a str,
+	pub args_json_contains: Option<&'a str>,
+}
+#[allow(unused)]
+impl<'a> Query<'a> {
+	pub fn new(name: &'a str) -> Self {
+		Self { limit: 1, name, args_json_contains: None }
+	}
+
+	pub fn limit(mut self, limit: u32) -> Self {
+		self.limit = limit;
+
+		self
+	}
+
+	pub fn name(mut self, name: &'a str) -> Self {
+		self.name = name;
+
+		self
+	}
+
+	pub fn args_json_contains(mut self, args_json_contains: &'a str) -> Self {
+		self.args_json_contains = Some(args_json_contains);
+
+		self
+	}
+}
+impl<'a> Display for Query<'a> {
+	fn fmt(&self, f: &mut Formatter) -> FmtResult {
+		write!(
+			f,
+			"{{\
+				\"query\":\"{{\
+					events(\
+						limit:{},\
+						orderBy:block_id_DESC,\
+						where:{{\
+							name_eq:\\\"{}\\\"\
+							{}\
+						}}\
+					){{\
+						args,\
+						block{{height}}\
+					}}\
+				}}\"\
+			}}",
+			self.limit,
+			self.name,
+			if let Some(args_json_contains) = self.args_json_contains {
+				format!(",args_jsonContains:\\\"{}\\\"", args_json_contains)
+			} else {
+				"".into()
+			}
+		)
+	}
+}
+#[test]
+fn query_string_should_work() {
+	assert_eq!(
+		Query::new("Auctions.BidAccepted")
+			.args_json_contains(
+				"{{\\\\\\\"bidder\\\\\\\":\\\\\\\"0x1234\\\\\\\",\\\\\\\"paraId\\\\\\\":2000}}",
+			)
+			.to_string(),
+		"{\"query\":\"{events(limit:1,orderBy:block_id_DESC,where:{name_eq:\\\"Auctions.BidAccepted\\\",args_jsonContains:\\\"{{\\\\\\\"bidder\\\\\\\":\\\\\\\"0x1234\\\\\\\",\\\\\\\"paraId\\\\\\\":2000}}\\\"}){args,block{height}}}\"}"
+	);
+}
+
+impl Hunter {
+	pub async fn query<'a, D>(&self, query: Query<'a>) -> Result<D>
+	where
+		D: DeserializeOwned,
+	{
+		Ok(self
+			.http
+			.post(&self.configuration.graphql_endpoint)
+			.body(query.to_string())
+			.send()
+			.await?
+			.json()
+			.await?)
+	}
+
+	pub async fn last_accepted_bid_of(
+		&self,
+		who: &str,
+		para_id: ParaId,
+	) -> Result<Option<AcceptedBid>> {
+		let mut events = self
+			.query::<EResponse<Event<EBidAccepted>>>(
+				Query::new("Auctions.BidAccepted").args_json_contains(&format!(
+					"{{\\\\\\\"bidder\\\\\\\":\\\\\\\"{who}\\\\\\\",\\\\\\\"paraId\\\\\\\":{para_id}}}",
+				)),
+			)
+			.await?
+			.data
+			.events;
+
+		if events.is_empty() {
+			Ok(None)
+		} else {
+			let e = events.remove(0);
+
+			Ok(Some(AcceptedBid {
+				at: e.block.height,
+				amount: e.args.amount.parse().expect("`amount` must be invalid digit"),
+				first_slot: e.args.first_slot,
+				last_slot: e.args.last_slot,
+			}))
+		}
+	}
+}
diff --git a/src/hunter/node.rs b/src/hunter/node.rs
new file mode 100644
index 0000000..d082bfa
--- /dev/null
+++ b/src/hunter/node.rs
@@ -0,0 +1,176 @@
+// crates.io
+use parity_scale_codec::Decode;
+use serde::Deserialize;
+use subxt::{
+	config::polkadot::H256,
+	dynamic::{self, At, Value},
+};
+// slothunter
+use crate::hunter::*;
+
+const E_DE: &str = "failed to decode/deserialize, type need to be updated";
+const E_TYPE_CONVERSION: &str = "type conversion never fails";
+
+impl Hunter {
+	pub async fn auction_ending_period(&self) -> Result<BlockNumber> {
+		Ok(self
+			.node
+			.constants()
+			.at(&dynamic::constant("Auctions", "EndingPeriod"))?
+			.to_value()?
+			.as_u128()
+			.expect(E_TYPE_CONVERSION) as _)
+	}
+
+	pub async fn auction_sample_length(&self) -> Result<BlockNumber> {
+		Ok(self
+			.node
+			.constants()
+			.at(&dynamic::constant("Auctions", "SampleLength"))?
+			.to_value()?
+			.as_u128()
+			.expect(E_TYPE_CONVERSION) as _)
+	}
+
+	pub async fn proxies_at(
+		&self,
+		block: &H256,
+		real: &AccountId,
+	) -> Result<Option<Vec<ProxyDefinition>>> {
+		self.node
+			.storage()
+			.at(block.to_owned())
+			.fetch(&dynamic::storage("Proxy", "Proxies", vec![Value::from_bytes(real)]))
+			.await?
+			.map(|p| {
+				// https://github.com/paritytech/substrate/blob/51b2f0ed6af8dd4facb18f1a489e192fd0673f7b/frame/proxy/src/lib.rs#L573
+				let (p, _) =
+					<(Vec<UnnamedWrapper<ProxyDefinition>>, Balance)>::deserialize(p.to_value()?)
+						.expect(E_DE);
+				let r: Result<Vec<ProxyDefinition>> = Ok(p.into_iter().map(|p| p.r#type).collect());
+
+				r
+			})
+			.transpose()
+	}
+
+	pub async fn auction_at(&self, block: &H256) -> Result<Option<AuctionDetail>> {
+		const E_STORAGE_TYPE: &str = "`AuctionInfo` has an invalid storage type";
+
+		if let Some(auction_info) = self
+			.node
+			.storage()
+			.at(block.to_owned())
+			.fetch(&dynamic::storage_root("Auctions", "AuctionInfo"))
+			.await?
+		{
+			let auction_info = auction_info.to_value()?;
+			let auction_counter = self
+				.node
+				.storage()
+				.at(block.to_owned())
+				.fetch(&dynamic::storage_root("Auctions", "AuctionCounter"))
+				.await?
+				.expect("`Auction::AuctionCounter` must exist");
+			let auction_counter = auction_counter.to_value()?;
+
+			Ok(Some(AuctionDetail {
+				index: auction_counter.as_u128().expect(E_TYPE_CONVERSION) as _,
+				first_lease_period: auction_info
+					.at(0)
+					.expect(E_STORAGE_TYPE)
+					.as_u128()
+					.expect(E_TYPE_CONVERSION) as _,
+				ending_period_start_at: auction_info
+					.at(1)
+					.expect(E_STORAGE_TYPE)
+					.as_u128()
+					.expect(E_TYPE_CONVERSION) as _,
+			}))
+		} else {
+			Ok(None)
+		}
+	}
+
+	pub async fn fund_index_at(&self, block: &H256) -> Result<Option<u32>> {
+		if let Some(f) = self
+			.node
+			.storage()
+			.at(block.to_owned())
+			.fetch(&dynamic::storage(
+				"Crowdloan",
+				"Funds",
+				vec![Value::u128(self.configuration.bid.para_id as _)],
+			))
+			.await?
+		{
+			Ok(Some(
+				f.to_value()?.at("fund_index").expect(E_DE).as_u128().expect(E_TYPE_CONVERSION)
+					as _,
+			))
+		} else {
+			Ok(None)
+		}
+	}
+
+	pub async fn bidders_at(&self, block: &H256) -> Result<Vec<Bidder>> {
+		let mut bidders = Vec::new();
+		let mut bidders_storage = self
+			.node
+			.storage()
+			.at(block.to_owned())
+			.iter(dynamic::storage_root("Auctions", "ReservedAmounts"), 32)
+			.await?;
+
+		while let Some((k, v)) = bidders_storage.next().await? {
+			// twox64_concat
+			// (twox128(b"Auctions") + twox128(b"ReservedAmounts") + twox64(key)).len() = 40
+			// key = k.0[40..]
+			let (who, para_id) = <(AccountId, ParaId)>::decode(&mut &k.0[40..]).expect(E_DE);
+			let existing_deposit = self
+				.node
+				.storage()
+				.at(block.to_owned())
+				.fetch(&dynamic::storage("Slots", "Leases", vec![Value::u128(para_id as _)]))
+				.await?
+				.and_then(|l: dynamic::DecodedValueThunk| {
+					SLeases::decode(&mut &*l.into_encoded())
+						.expect(E_DE)
+						.into_iter()
+						.filter_map(|l| l.and_then(|(w, a)| if who == w { Some(a) } else { None }))
+						.max()
+				})
+				.unwrap_or_default();
+			let last_accepted_bid =
+				self.last_accepted_bid_of(&array_bytes::bytes2hex("0x", who), para_id).await?;
+
+			bidders.push(Bidder {
+				who,
+				para_id,
+				reserved: v.to_value()?.as_u128().expect(E_TYPE_CONVERSION),
+				existing_deposit,
+				last_accepted_bid,
+			});
+		}
+
+		Ok(bidders)
+	}
+
+	pub async fn winning_at(
+		&self,
+		block: &H256,
+		now: BlockNumber,
+		ending_period_start_at: BlockNumber,
+	) -> Result<Option<Winning>> {
+		let winning_offset =
+			util::winning_offset_of(now, ending_period_start_at, self.auction_sample_length);
+
+		Ok(self
+			.node
+			.storage()
+			.at(block.to_owned())
+			.fetch(&dynamic::storage("Auctions", "Winning", vec![Value::u128(winning_offset as _)]))
+			.await?
+			.map(|w| Winning::of(SWinning::decode(&mut &*w.into_encoded()).expect(E_DE))))
+	}
+}
diff --git a/src/hunter/notification.rs b/src/hunter/notification.rs
new file mode 100644
index 0000000..1aaf429
--- /dev/null
+++ b/src/hunter/notification.rs
@@ -0,0 +1,67 @@
+// crates.io
+use lettre::{
+	message::Mailbox, transport::smtp::authentication::Credentials, Message, SmtpTransport,
+	Transport,
+};
+use serde::Serialize;
+// slothunter
+use crate::hunter::*;
+
+#[derive(Debug)]
+pub struct Mail {
+	pub sender: Sender,
+	pub receivers: Vec<Mailbox>,
+}
+#[derive(Debug)]
+pub struct Sender {
+	pub username: Mailbox,
+	pub password: String,
+	pub smtp: String,
+}
+
+impl Hunter {
+	pub fn notify_mail<S>(&self, object: &S, addition: &str)
+	where
+		S: Serialize,
+	{
+		if let Some(m) = &self.configuration.notification.mail {
+			let notification = serde_json::to_string(&serde_json::json!({
+				"object": object,
+				"addition": addition,
+			}))
+			.expect("json must be valid");
+
+			for to in &m.receivers {
+				let mail = Message::builder()
+					.from(m.sender.username.clone())
+					.to(to.to_owned())
+					.subject("Slothunter")
+					.body(notification.clone())
+					.expect("message must be valid");
+				let smtp_transport = SmtpTransport::relay(&m.sender.smtp)
+					.expect("smtp must be valid")
+					.credentials(Credentials::new(
+						m.sender.username.email.to_string(),
+						m.sender.password.clone(),
+					))
+					.build();
+
+				let _ = smtp_transport.send(&mail);
+			}
+		}
+	}
+
+	pub async fn notify_webhook<S>(&self, object: &S, addition: &str)
+	where
+		S: Serialize,
+	{
+		let json = serde_json::json!({
+			"object": object,
+			"addition": addition,
+		});
+
+		for u in &self.configuration.notification.webhooks {
+			let _ = self.http.post(u).json(&json).send().await;
+		}
+	}
+}
diff --git a/src/hunter/tx.rs b/src/hunter/tx.rs
new file mode 100644
index 0000000..7a1b155
--- /dev/null
+++ b/src/hunter/tx.rs
@@ -0,0 +1,169 @@
+// crates.io
+use subxt::{
+	dynamic::{self, Value},
+	tx::TxPayload,
+	Error,
+};
+// slothunter
+use crate::hunter::*;
+
+impl Hunter {
+	async fn tx<C>(&self, call: &C) -> Result<DispatchResult>
+	where
+		C: TxPayload,
+	{
+		match self
+			.node
+			.tx()
+			.sign_and_submit_then_watch_default(call, &self.configuration.bid.delegate)
+			.await?
+			.wait_for_in_block()
+			.await?
+			.wait_for_success()
+			.await
+		{
+			Ok(r) => Ok(r
+				// Always using proxy in production, this must be some.
+				.find_first::<EProxyExecuted>()?
+				.map(EProxyExecuted::into_dispatch_result)
+				.unwrap_or_else(|| {
+					tracing::warn!("this log should only appear in a test");
+
+					Ok(())
+				})),
+			Err(Error::Runtime(e)) => Ok(Err(e.to_string())),
+			Err(e) => Err(e)?,
+		}
+	}
+
+	pub async fn bid(&self, auction_index: u32, value: Balance) -> Result<DispatchResult> {
+		let bid = dynamic::tx(
+			"Auctions",
+			"bid",
+			vec![
+				Value::u128(self.configuration.bid.para_id as _),
+				Value::u128(auction_index as _),
+				Value::u128(self.configuration.bid.leases.0 as _),
+				Value::u128(self.configuration.bid.leases.1 as _),
+				Value::u128(value),
+			],
+		);
+		let proxied_bid = util::proxy_of(&self.configuration.bid.real, bid);
+
+		self.tx(&proxied_bid).await
+	}
+
+	pub async fn contribute(&self, value: Balance) -> Result<DispatchResult> {
+		let contribute = dynamic::tx(
+			"Crowdloan",
+			"contribute",
+			vec![
+				Value::u128(self.configuration.bid.para_id as _),
+				Value::u128(value),
+				Value::unnamed_variant("None", []),
+			],
+		);
+		let proxied_contribute = util::proxy_of(&self.configuration.bid.real, contribute);
+
+		self.tx(&proxied_contribute).await
+	}
+}
+
+#[cfg(feature = "node-test")]
+#[tokio::test]
+async fn tx_should_work() {
+	let hunter = Hunter::tester().await;
+
+	{
+		// Use `Alice//stash` to transfer funds from `Alice` to `Alice//stash`.
+		let transfer = dynamic::tx(
+			"Balances",
+			"transfer",
+			vec![
+				Value::unnamed_variant(
+					"Id",
+					[Value::from_bytes(hunter.configuration.bid.delegate.account_id())],
+				),
+				Value::u128(1_000_000_000_000),
+			],
+		);
+		let proxied_transfer = util::proxy_of(&hunter.configuration.bid.real, transfer);
+
+		assert!(hunter.tx(&proxied_transfer).await.unwrap().is_ok());
+	}
+
+	{
+		// Use `Alice//stash` to transfer too much funds from `Alice` to `Alice//stash`.
+		let transfer_too_much = dynamic::tx(
+			"Balances",
+			"transfer",
+			vec![
+				Value::unnamed_variant(
+					"Id",
+					[Value::from_bytes(hunter.configuration.bid.delegate.account_id())],
+				),
+				Value::u128(10_000_000_000_000_000_000),
+			],
+		);
+		let proxied_transfer_too_much =
+			util::proxy_of(&hunter.configuration.bid.real, transfer_too_much);
+
+		assert_eq!(
+			hunter.tx(&proxied_transfer_too_much).await.unwrap(),
+			Err("Value { value: Variant(Variant { name: \"Token\", values: Unnamed([Value { value: Variant(Variant { name: \"FundsUnavailable\", values: Unnamed([]) }), context: 27 }]) }), context: 25 }".into())
+		);
+	}
+
+	{
+		// Transfer too much funds from `Alice//stash` to `Alice`.
+		let transfer_too_much = dynamic::tx(
+			"Balances",
+			"transfer",
+			vec![
+				Value::unnamed_variant("Id", [Value::from_bytes(hunter.configuration.bid.real)]),
+				Value::u128(10_000_000_000_000_000_000),
+			],
+		);
+
+		assert_eq!(
+			hunter.tx(&transfer_too_much).await.unwrap(),
+			Err("Token error: Funds are unavailable.".into())
+		);
+	}
+
+	{
+		// Transfer all funds from `Alice//stash` to `Alice`.
+		// Note: after this, `Alice//stash` will no longer be available for other tests.
+		let transfer_all = dynamic::tx(
+			"Balances",
+			"transfer_all",
+			vec![
+				Value::unnamed_variant("Id", [Value::from_bytes(hunter.configuration.bid.real)]),
+				Value::bool(true),
+			],
+		);
+
+		assert!(hunter.tx(&transfer_all).await.unwrap().is_ok());
+	}
+
+	{
+		// Use `Alice//stash` to transfer funds from `Alice` to `Alice//stash`.
+		let transfer = dynamic::tx(
+			"Balances",
+			"transfer",
+			vec![
+				Value::unnamed_variant(
+					"Id",
+					[Value::from_bytes(hunter.configuration.bid.delegate.account_id())],
+				),
+				Value::u128(1_000_000_000_000),
+			],
+		);
+		let proxied_transfer = util::proxy_of(&hunter.configuration.bid.real, transfer);
+
+		assert_eq!(
+			hunter.tx(&proxied_transfer).await.unwrap_err().to_string(),
+			"Rpc error: RPC error: RPC call failed: ErrorObject { code: ServerError(1010), message: \"Invalid Transaction\", data: Some(RawValue(\"Inability to pay some fees (e.g. account balance too low)\")) }".to_string()
+		);
+	}
+}
diff --git a/src/hunter/util.rs b/src/hunter/util.rs
new file mode 100644
index 0000000..b91eb88
--- /dev/null
+++ b/src/hunter/util.rs
@@ -0,0 +1,240 @@
+// crates.io
+use parity_scale_codec::{Decode, Encode};
+use regex::Regex;
+use reqwest::{
+	header::{HeaderMap, CONTENT_TYPE},
+	Client, ClientBuilder,
+};
+use scale_value::Composite;
+use serde::ser::Serializer;
+use sp_runtime::{traits::AccountIdConversion, TypeId};
+use subxt::{
+	dynamic::{self, Value},
+	tx::Payload,
+};
+// slothunter
+use crate::hunter::*;
+
+const E_REGEX_MUST_BE_VALID: &str = "regex must be valid";
+
+pub fn check_http_uri(uri: &str) -> bool {
+	Regex::new(r"^https?://[^\s/$.?#].[^\s]*$").expect(E_REGEX_MUST_BE_VALID).is_match(uri)
+}
+pub fn check_ws_uri(uri: &str) -> bool {
+	Regex::new(r"^wss?://[^\s/$.?#].[^\s]*$").expect(E_REGEX_MUST_BE_VALID).is_match(uri)
+}
+pub fn check_smtp_uri(uri: &str) -> bool {
+	Regex::new(r"^[a-zA-Z0-9.-]+(:\d+)?$").expect(E_REGEX_MUST_BE_VALID).is_match(uri)
+}
+#[test]
+fn check_uri_should_work() {
+	assert!(check_http_uri("http://localhost:8080/path/to/file.html"));
+	assert!(check_http_uri("https://www.example.com"));
+	assert!(!check_http_uri("invalid url"));
+
+	assert!(check_ws_uri("ws://localhost:8080/socket"));
+	assert!(check_ws_uri("wss://localhost:8080/socket"));
+	assert!(!check_ws_uri("invalid url"));
+
+	assert!(check_smtp_uri("smtp.example.com"));
+	assert!(check_smtp_uri("smtp.example.com:587"));
+	assert!(!check_smtp_uri("invalid url"));
+}
+
+pub fn http_json_client() -> Client {
+	ClientBuilder::new()
+		.default_headers(HeaderMap::from_iter([(
+			CONTENT_TYPE,
+			"application/json".parse().unwrap(),
+		)]))
+		.build()
+		.unwrap()
+}
+
+pub fn crowdloan_id_of(index: u32) -> AccountId {
+	#[derive(Encode, Decode)]
+	pub struct CrowdloanId(pub [u8; 8]);
+	impl TypeId for CrowdloanId {
+		const TYPE_ID: [u8; 4] = *b"modl";
+	}
+
+	CrowdloanId(*b"py/cfund").into_sub_account_truncating(index)
+}
+#[test]
+fn crowdloan_id_of_should_work() {
+	assert_eq!(
+		crowdloan_id_of(0),
+		array_bytes::hex2array_unchecked(
+			"0x6d6f646c70792f6366756e640000000000000000000000000000000000000000"
+		)
+	);
+}
+
+pub fn winning_offset_of(
+	block_number: BlockNumber,
+	ending_period_start_at: BlockNumber,
+	sample_length: BlockNumber,
+) -> u32 {
+	if let Some(ending_duration) = block_number.checked_sub(ending_period_start_at) {
+		ending_duration / sample_length
+	} else {
+		0
+	}
+}
+#[test]
+fn winning_offset_of_should_work() {
+	const TWO_MINUTES: BlockNumber = 2 * 60 / 6;
+
+	assert_eq!(winning_offset_of(4, 5, TWO_MINUTES), 0);
+	assert_eq!(winning_offset_of(24, 5, TWO_MINUTES), 0);
+	assert_eq!(winning_offset_of(25, 5, TWO_MINUTES), 1);
+	assert_eq!(winning_offset_of(45, 5, TWO_MINUTES), 2);
+	assert_eq!(winning_offset_of(65, 5, TWO_MINUTES), 3);
+	assert_eq!(winning_offset_of(123456, 789, TWO_MINUTES), 6133);
+}
+
+pub fn position_in_ranges(slot_range: &SlotRange) -> Option<usize> {
+	C_SLOT_RANGES.iter().position(|s| s == slot_range)
+}
+#[test]
+fn position_in_ranges_should_work() {
+	assert_eq!(position_in_ranges(&(0, 0)), Some(0));
+	assert_eq!(position_in_ranges(&(0, 1)), Some(1));
+	assert_eq!(position_in_ranges(&(0, 2)), Some(2));
+	assert_eq!(position_in_ranges(&(0, 3)), Some(3));
+	assert_eq!(position_in_ranges(&(0, 4)), Some(4));
+	assert_eq!(position_in_ranges(&(0, 5)), Some(5));
+	assert_eq!(position_in_ranges(&(0, 6)), Some(6));
+	assert_eq!(position_in_ranges(&(0, 7)), Some(7));
+	assert_eq!(position_in_ranges(&(0, 8)), None);
+	assert_eq!(position_in_ranges(&(1, 1)), Some(8));
+	assert_eq!(position_in_ranges(&(1, 2)), Some(9));
+	assert_eq!(position_in_ranges(&(1, 3)), Some(10));
+	assert_eq!(position_in_ranges(&(1, 4)), Some(11));
+	assert_eq!(position_in_ranges(&(1, 5)), Some(12));
+	assert_eq!(position_in_ranges(&(1, 6)), Some(13));
+	assert_eq!(position_in_ranges(&(1, 7)), Some(14));
+	assert_eq!(position_in_ranges(&(2, 2)), Some(15));
+	assert_eq!(position_in_ranges(&(2, 3)), Some(16));
+	assert_eq!(position_in_ranges(&(2, 4)), Some(17));
+	assert_eq!(position_in_ranges(&(2, 5)), Some(18));
+	assert_eq!(position_in_ranges(&(2, 6)), Some(19));
+	assert_eq!(position_in_ranges(&(2, 7)), Some(20));
+	assert_eq!(position_in_ranges(&(3, 3)), Some(21));
+	assert_eq!(position_in_ranges(&(3, 4)), Some(22));
+	assert_eq!(position_in_ranges(&(3, 5)), Some(23));
+	assert_eq!(position_in_ranges(&(3, 6)), Some(24));
+	assert_eq!(position_in_ranges(&(3, 7)), Some(25));
+	assert_eq!(position_in_ranges(&(4, 4)), Some(26));
+	assert_eq!(position_in_ranges(&(4, 5)), Some(27));
+	assert_eq!(position_in_ranges(&(4, 6)), Some(28));
+	assert_eq!(position_in_ranges(&(4, 7)), Some(29));
+	assert_eq!(position_in_ranges(&(5, 5)), Some(30));
+	assert_eq!(position_in_ranges(&(5, 6)), Some(31));
+	assert_eq!(position_in_ranges(&(5, 7)), Some(32));
+	assert_eq!(position_in_ranges(&(6, 6)), Some(33));
+	assert_eq!(position_in_ranges(&(6, 7)), Some(34));
+	assert_eq!(position_in_ranges(&(7, 7)), Some(35));
+	assert_eq!(position_in_ranges(&(8, 7)), None);
+}
+
+pub fn leases_length(leases: &SlotRange) -> u32 {
+	leases.1 - leases.0 + 1
+}
+
+pub fn ranges_are_intersecting(a: &SlotRange, b: &SlotRange) -> bool {
+	a.0 <= b.1 && a.1 >= b.0
+}
+#[test]
+fn ranges_are_intersecting_should_work() {
+	// w = [1, 2], l = [2, 3]
+	assert!(ranges_are_intersecting(&(1, 2), &(2, 3)));
+	// w = [3, 4], l = [2, 3]
+	assert!(ranges_are_intersecting(&(3, 4), &(2, 3)));
+	// w = [1, 4], l = [2, 3]
+	assert!(ranges_are_intersecting(&(1, 4), &(2, 3)));
+}
+
+pub fn combinations<T>(elements: &[T]) -> Vec<Vec<&T>> {
+	let n = elements.len();
+	let mut combinations = Vec::new();
+
+	(1..=(1 << n) - 1).for_each(|i| {
+		let mut combination = Vec::new();
+
+		(0..n).for_each(|j| {
+			if i & (1 << j) != 0 {
+				combination.push(&elements[j]);
+			}
+		});
+
+		combinations.push(combination);
+	});
+
+	combinations
+}
+#[test]
+fn combinations_should_work() {
+	assert_eq!(
+		combinations(&['A', 'B', 'C', 'D']),
+		vec![
+			vec![&'A'],
+			vec![&'B'],
+			vec![&'A', &'B'],
+			vec![&'C'],
+			vec![&'A', &'C'],
+			vec![&'B', &'C'],
+			vec![&'A', &'B', &'C'],
+			vec![&'D'],
+			vec![&'A', &'D'],
+			vec![&'B', &'D'],
+			vec![&'A', &'B', &'D'],
+			vec![&'C', &'D'],
+			vec![&'A', &'C', &'D'],
+			vec![&'B', &'C', &'D'],
+			vec![&'A', &'B', &'C', &'D']
+		]
+	);
+}
+
+pub fn blocks2time(blocks_count: BlockNumber) -> String {
+	const HOUR: u64 = 60 * 60;
+	const DAY: u64 = HOUR * 24;
+	const BLOCK_TIME: u64 = 6;
+
+	let seconds = blocks_count as u64 * BLOCK_TIME;
+	let d = seconds / DAY;
+	let h = (seconds % DAY) / HOUR;
+	let m = (seconds % HOUR) / 60;
+	let s = seconds % 60;
+
+	format!("{d}d:{h}h:{m}m:{s}s")
+}
+#[test]
+fn blocks2time_should_work() {
+	assert_eq!(blocks2time(0), "0d:0h:0m:0s");
+	assert_eq!(blocks2time(1), "0d:0h:0m:6s");
+	assert_eq!(blocks2time(10), "0d:0h:1m:0s");
+	assert_eq!(blocks2time(600), "0d:1h:0m:0s");
+	assert_eq!(blocks2time(14400), "1d:0h:0m:0s");
+	assert_eq!(blocks2time(123456), "8d:13h:45m:36s");
+}
+
+pub fn serialize_account_id<S>(account_id: &AccountId, serializer: S) -> StdResult<S::Ok, S::Error>
+where
+	S: Serializer,
+{
+	serializer.serialize_str(&array_bytes::bytes2hex("0x", account_id))
+}
+
+pub fn proxy_of(real: &AccountId, call: Payload<Composite<()>>) -> Payload<Composite<()>> {
+	dynamic::tx(
+		"Proxy",
+		"proxy",
+		vec![
+			Value::unnamed_variant("Id", [Value::from_bytes(real)]),
+			Value::unnamed_variant("None", []),
+			call.into_value(),
+		],
+	)
+}
diff --git a/src/lib.rs b/src/lib.rs
deleted file mode 100644
index e69de29..0000000
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..b8b660f
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,60 @@
+//! A bot for Polkadot parachain auction.
+
+mod hunter;
+use hunter::*;
+
+mod primitive;
+
+mod prelude {
+	pub use std::result::Result as StdResult;
+
+	pub use anyhow::Result;
+
+	pub use crate::primitive::*;
+}
+
+// std
+use std::path::PathBuf;
+// crates.io
+use clap::Parser;
+
+#[derive(Debug, Parser)]
+#[command(
+	version = concat!(
+		env!("CARGO_PKG_VERSION"),
+		"-",
+		env!("VERGEN_GIT_SHA"),
+		"-",
+		env!("VERGEN_CARGO_TARGET_TRIPLE"),
+	),
+	about,
+	rename_all = "kebab",
+)]
+struct Cli {
+	/// Path to the configuration toml's file or folder.
+	///
+	/// If a file is provided, it will be loaded as the configuration TOML.
+	/// Otherwise, Slothunter will search for the config.toml file in the specified folder.
+	///
+	/// Default paths are:
+	///   Linux:   /home/alice/.config/slothunter
+	///   Windows: C:\Users\Alice\AppData\Roaming\slothunter
+	///   MacOS:   /Users/Alice/Library/Application Support/slothunter
+	#[arg(long, short, value_name = "PATH", verbatim_doc_comment)]
+	configuration: Option<PathBuf>,
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+	color_eyre::install().map_err(|e| anyhow::anyhow!(e))?;
+	tracing_subscriber::fmt::init();
+
+	let Cli { configuration } = Cli::parse();
+
+	Hunter::from_configuration(ConfigurationToml::load(configuration)?.try_into_configuration()?)
+		.await?
+		.start()
+		.await?;
+
+	Ok(())
+}
diff --git a/src/primitive.rs b/src/primitive.rs
new file mode 100644
index 0000000..92c37a1
--- /dev/null
+++ b/src/primitive.rs
@@ -0,0 +1,411 @@
+mod runtime;
+pub use runtime::*;
+
+// std
+#[cfg(test)] use std::fmt::{Debug, Formatter, Result as FmtResult};
+// crates.io
+use serde::Serialize;
+// slothunter
+use crate::hunter::*;
+
+pub type BlockNumber = u32;
+pub type AccountId = [u8; 32];
+pub type Balance = u128;
+pub type ParaId = u32;
+pub type SlotRange = (u32, u32);
+
+#[derive(Debug, Serialize)]
+pub struct AuctionDetail {
+	pub index: u32,
+	pub first_lease_period: u32,
+	pub ending_period_start_at: BlockNumber,
+}
+impl AuctionDetail {
+	pub fn fmt(&self, now: BlockNumber, end_at: BlockNumber) -> String {
+		let remain_blocks = end_at.saturating_sub(now);
+
+		format!(
+			"auction(#{}) for leases[#{}, #{}) has been activated for block range[#{}, #{end_at}], remain {remain_blocks} block(s) approximately {}",
+			self.index,
+			self.first_lease_period,
+			self.first_lease_period + C_RANGE_COUNT,
+			self.ending_period_start_at,
+			util::blocks2time(remain_blocks)
+		)
+	}
+}
+
+#[derive(Debug)]
+pub struct Bidder {
+	pub who: AccountId,
+	pub para_id: ParaId,
+	pub reserved: Balance,
+	pub existing_deposit: Balance,
+	pub last_accepted_bid: Option<AcceptedBid>,
+}
+impl Bidder {
+	pub fn fmt(&self, token: &Token) -> String {
+		format!(
+			"bidder({}, {}) has bid with extra reservation {} this turn{}",
+			array_bytes::bytes2hex("0x", self.who),
+			self.para_id,
+			token.fmt(self.reserved),
+			if self.existing_deposit == 0 {
+				"".into()
+			} else {
+				format!(
+					" and found it has an existing lease with deposit {}",
+					token.fmt(self.existing_deposit)
+				)
+			},
+		)
+	}
+}
+#[derive(Debug)]
+pub struct AcceptedBid {
+	pub at: BlockNumber,
+	pub amount: Balance,
+	pub first_slot: u32,
+	pub last_slot: u32,
+}
+impl AcceptedBid {
+	pub fn fmt(&self, token: &Token) -> String {
+		format!(
+			"{} for lease(s)[#{}, #{}] at block height(#{})",
+			token.fmt(self.amount),
+			self.first_slot,
+			self.last_slot,
+			self.at,
+		)
+	}
+}
+
+#[derive(Debug)]
+pub struct Winning(pub [Option<Winner>; 36]);
+impl Winning {
+	pub fn of(s_winning: SWinning) -> Self {
+		Self(array_bytes::vec2array_unchecked(
+			s_winning
+				.iter()
+				.cloned()
+				.enumerate()
+				.map(|(i, w)| w.map(|w| Winner::construct(w, C_SLOT_RANGES[i])))
+				.collect(),
+		))
+	}
+
+	pub fn fmt(&self, token: &Token, first_lease_period: u32) -> Vec<String> {
+		self.0
+			.iter()
+			.filter_map(|w| w.as_ref().map(|w| w.fmt(token, first_lease_period)))
+			.collect::<Vec<_>>()
+	}
+
+	pub fn result(&self) -> (Vec<Winner>, Balance) {
+		fn winner_of(winning: &Winning, leases: &SlotRange) -> (Option<ParaId>, Balance) {
+			util::position_in_ranges(leases)
+				.and_then(|i| {
+					winning.0.get(i).and_then(|w| {
+						w.as_ref().map(|w| {
+							(Some(w.para_id), w.value * util::leases_length(&w.leases) as Balance)
+						})
+					})
+				})
+				.unwrap_or_default()
+		}
+
+		let mut winning = [
+			(Vec::new(), 0),
+			(Vec::new(), 0),
+			(Vec::new(), 0),
+			(Vec::new(), 0),
+			(Vec::new(), 0),
+			(Vec::new(), 0),
+			(Vec::new(), 0),
+			(Vec::new(), 0),
+		];
+
+		assert_eq!(winning.len(), C_RANGE_COUNT as usize);
+
+		(0..C_RANGE_COUNT).for_each(|i| {
+			let (para_id, value) = winner_of(self, &(0, i));
+
+			winning[i as usize] = (para_id.map(|p| vec![p]).unwrap_or_default(), value);
+
+			(0..i).for_each(|j| {
+				let (para_id, mut value) = winner_of(self, &(j + 1, i));
+
+				value += winning[j as usize].1;
+
+				if value > winning[i as usize].1 {
+					winning[i as usize] = (
+						if let Some(p) = para_id {
+							let mut winners = winning[j as usize].0.clone();
+
+							winners.push(p);
+
+							winners
+						} else {
+							winning[j as usize].0.clone()
+						},
+						value,
+					);
+				}
+			});
+		});
+
+		winning
+			.last()
+			.map(|(winners, threshold)| {
+				(
+					winners
+						.iter()
+						.map(|p| {
+							self.0
+								.iter()
+								.filter_map(Option::as_ref)
+								.find(|w| &w.para_id == p)
+								.expect("para id must exist")
+						})
+						.cloned()
+						.collect(),
+					*threshold,
+				)
+			})
+			.expect("winners must be some")
+	}
+
+	pub fn minimum_bid_to_win(&self, leases: &SlotRange, threshold: Balance) -> Balance {
+		let intersecting_leases = self
+			.0
+			.iter()
+			.filter_map(Option::as_ref)
+			.filter(|w| !util::ranges_are_intersecting(&w.leases, leases))
+			.collect::<Vec<_>>();
+		let mut combinations = util::combinations(&intersecting_leases);
+
+		combinations.retain(|c| {
+			for i in 0..c.len() {
+				for j in i + 1..c.len() {
+					if util::ranges_are_intersecting(&c[i].leases, &c[j].leases) {
+						return false;
+					}
+				}
+			}
+
+			true
+		});
+
+		let leases_length = util::leases_length(leases) as Balance;
+
+		combinations
+			.into_iter()
+			.map(|c| {
+				(threshold
+					- c.into_iter()
+						.fold(0, |v, w| v + w.value * util::leases_length(&w.leases) as Balance))
+					/ leases_length
+			})
+			.min()
+			.unwrap_or(threshold / leases_length)
+	}
+}
+impl Default for Winning {
+	fn default() -> Self {
+		Self([None; 36])
+	}
+}
+#[derive(Clone, Copy, Serialize)]
+#[cfg_attr(not(test), derive(Debug))]
+#[cfg_attr(test, derive(PartialEq))]
+pub struct Winner {
+	#[serde(serialize_with = "util::serialize_account_id")]
+	pub who: AccountId,
+	pub para_id: ParaId,
+	pub leases: SlotRange,
+	pub value: Balance,
+}
+impl Winner {
+	pub fn construct(s_winner: SWinner, leases: SlotRange) -> Self {
+		Self { who: s_winner.0, para_id: s_winner.1, leases, value: s_winner.2 }
+	}
+
+	pub fn fmt(&self, token: &Token, first_lease_period: u32) -> String {
+		format!(
+			"bidder({}, {}) has won the lease(s)[#{}, #{}] with {}",
+			array_bytes::bytes2hex("0x", self.who),
+			self.para_id,
+			first_lease_period + self.leases.0,
+			first_lease_period + self.leases.1,
+			token.fmt(self.value),
+		)
+	}
+}
+#[cfg(test)]
+impl Debug for Winner {
+	fn fmt(&self, f: &mut Formatter) -> FmtResult {
+		write!(
+			f,
+			"Winner {{ para_id: {}, leases: {:?}, value: {} }}",
+			self.para_id as u8 as char, self.leases, self.value,
+		)
+	}
+}
+#[cfg(test)]
+fn winner(para_id: char, leases: SlotRange, value: Balance) -> Winner {
+	Winner { who: [0; 32], para_id: para_id as ParaId, leases, value }
+}
+#[cfg(test)]
+fn add_winner(winning: &mut Winning, para_id: char, leases: SlotRange, value: Balance) {
+	winning.0[util::position_in_ranges(&leases).unwrap()] = Some(winner(para_id, leases, value));
+}
+#[test]
+fn winning_result_should_work() {
+	{
+		let mut winning = Winning([None; 36]);
+
+		assert_eq!(winning.result(), (Vec::new(), 0));
+
+		// A: (0, 1) -> 5
+		// B: (0, 2) -> 6
+		// C: (1, 2) -> 3
+		// D: (0, 3) -> 7
+		// E: (2, 3) -> 4
+		add_winner(&mut winning, 'A', (0, 1), 5);
+		add_winner(&mut winning, 'B', (0, 2), 6);
+		add_winner(&mut winning, 'C', (1, 2), 3);
+		add_winner(&mut winning, 'D', (0, 3), 7);
+		add_winner(&mut winning, 'E', (2, 3), 4);
+
+		assert_eq!(winning.result(), (vec![winner('D', (0, 3), 7)], 28));
+	}
+
+	{
+		let mut winning = Winning([None; 36]);
+
+		// A: (0, 0) -> 5
+		// B: (1, 1) -> 6
+		// C: (2, 2) -> 7
+		// D: (3, 3) -> 8
+		// E: (0, 3) -> 3
+		add_winner(&mut winning, 'A', (0, 0), 5);
+		add_winner(&mut winning, 'B', (1, 1), 6);
+		add_winner(&mut winning, 'C', (2, 2), 7);
+		add_winner(&mut winning, 'D', (3, 3), 8);
+		add_winner(&mut winning, 'E', (0, 3), 3);
+
+		assert_eq!(
+			winning.result(),
+			(
+				vec![
+					winner('A', (0, 0), 5),
+					winner('B', (1, 1), 6),
+					winner('C', (2, 2), 7),
+					winner('D', (3, 3), 8),
+				],
+				26
+			),
+		);
+	}
+
+	{
+		let mut winning = Winning([None; 36]);
+
+		// A: (0, 0) -> 5
+		// B: (1, 1) -> 6
+		// C: (2, 2) -> 7
+		// D: (3, 3) -> 8
+		// E: (0, 3) -> 3
+		add_winner(&mut winning, 'A', (0, 7), 10);
+		add_winner(&mut winning, 'B', (0, 2), 4);
+		add_winner(&mut winning, 'C', (3, 3), 5);
+		add_winner(&mut winning, 'D', (1, 7), 11);
+		add_winner(&mut winning, 'E', (4, 7), 16);
+
+		assert_eq!(
+			winning.result(),
+			(vec![winner('B', (0, 2), 4), winner('C', (3, 3), 5), winner('E', (4, 7), 16)], 81),
+		);
+	}
+}
+#[test]
+fn minimum_bid_to_win_should_work() {
+	{
+		let mut winning = Winning([None; 36]);
+
+		// A: (0, 3) -> 10
+		add_winner(&mut winning, 'A', (0, 3), 10);
+
+		assert_eq!(winning.minimum_bid_to_win(&(1, 2), winning.result().1), 20);
+	}
+
+	{
+		let mut winning = Winning([None; 36]);
+
+		// A: (0, 3) -> 10
+		// B: (0, 1) -> 10
+		add_winner(&mut winning, 'A', (0, 3), 10);
+		add_winner(&mut winning, 'B', (0, 1), 5);
+
+		assert_eq!(winning.minimum_bid_to_win(&(2, 3), winning.result().1), 15);
+	}
+
+	{
+		let mut winning = Winning([None; 36]);
+
+		// A: (0, 3) -> 10
+		// B: (0, 1) -> 5
+		// C: (0, 2) -> 8
+		// D: (1, 2) -> 7
+		add_winner(&mut winning, 'A', (0, 3), 10);
+		add_winner(&mut winning, 'B', (0, 1), 5);
+		add_winner(&mut winning, 'C', (0, 2), 8);
+		add_winner(&mut winning, 'D', (1, 2), 7);
+
+		assert_eq!(winning.minimum_bid_to_win(&(0, 0), winning.result().1), 26);
+	}
+
+	{
+		let mut winning = Winning([None; 36]);
+
+		// A: (1, 3) -> 11
+		// B: (2, 6) -> 21
+		// C: (7, 7) -> 34
+		add_winner(&mut winning, 'A', (1, 3), 11);
+		add_winner(&mut winning, 'B', (2, 6), 21);
+		add_winner(&mut winning, 'C', (7, 7), 34);
+
+		assert_eq!(winning.minimum_bid_to_win(&(0, 7), winning.result().1), 17);
+	}
+
+	{
+		let mut winning = Winning([None; 36]);
+
+		// A: (1, 2) -> 11
+		// B: (3, 6) -> 21
+		// C: (7, 7) -> 34
+		add_winner(&mut winning, 'A', (1, 2), 11);
+		add_winner(&mut winning, 'B', (3, 6), 21);
+		add_winner(&mut winning, 'C', (7, 7), 34);
+
+		assert_eq!(winning.minimum_bid_to_win(&(0, 7), winning.result().1), 17);
+	}
+
+	{
+		let mut winning = Winning([None; 36]);
+
+		// A: (0, 3) -> 10
+		// B: (0, 1) -> 10
+		// C: (2, 2) -> 5
+		// D: (1, 3) -> 11
+		// E: (3, 3) -> 16
+		add_winner(&mut winning, 'A', (0, 3), 10);
+		add_winner(&mut winning, 'B', (0, 1), 10);
+		add_winner(&mut winning, 'C', (2, 2), 5);
+		add_winner(&mut winning, 'D', (1, 3), 11);
+		add_winner(&mut winning, 'E', (3, 3), 16);
+		add_winner(&mut winning, 'F', (0, 0), 1);
+
+		assert_eq!(winning.minimum_bid_to_win(&(1, 2), winning.result().1), 12);
+	}
+}
diff --git a/src/primitive/runtime.rs b/src/primitive/runtime.rs
new file mode 100644
index 0000000..8abed23
--- /dev/null
+++ b/src/primitive/runtime.rs
@@ -0,0 +1,43 @@
+mod constant;
+pub use constant::*;
+
+mod event;
+pub use event::*;
+
+mod storage;
+pub use storage::*;
+
+// crates.io
+use serde::Deserialize;
+use subxt::dynamic::Value;
+// slothunter
+use crate::prelude::*;
+
+pub type DispatchResult = StdResult<(), String>;
+
+#[derive(Debug, Deserialize)]
+pub struct UnnamedWrapper<T> {
+	pub r#type: T,
+}
+
+#[derive(Debug, Deserialize)]
+pub enum DispatchError {
+	CannotLookup,
+	BadOrigin,
+	Module(UnnamedWrapper<ModuleError>),
+	ConsumerRemaining,
+	NoProviders,
+	TooManyConsumers,
+	Token(Value<()>),
+	Arithmetic(Value<()>),
+	Transactional(Value<()>),
+	Exhausted,
+	Corruption,
+	Unavailable,
+	RootNotAllowed,
+}
+#[derive(Debug, Deserialize)]
+pub struct ModuleError {
+	pub index: u8,
+	pub error: [u8; 4],
+}
diff --git a/src/primitive/runtime/constant.rs b/src/primitive/runtime/constant.rs
new file mode 100644
index 0000000..eabd562
--- /dev/null
+++ b/src/primitive/runtime/constant.rs
@@ -0,0 +1,43 @@
+// slothunter
+use crate::hunter::*;
+
+// https://github.com/paritytech/polkadot/blob/b1cc6fa14330261a305d56be36c04e9c99518993/runtime/common/src/slot_range.rs#L20
+pub const C_RANGE_COUNT: u32 = 8;
+pub const C_SLOT_RANGES: [SlotRange; 36] = [
+	(0, 0),
+	(0, 1),
+	(0, 2),
+	(0, 3),
+	(0, 4),
+	(0, 5),
+	(0, 6),
+	(0, 7),
+	(1, 1),
+	(1, 2),
+	(1, 3),
+	(1, 4),
+	(1, 5),
+	(1, 6),
+	(1, 7),
+	(2, 2),
+	(2, 3),
+	(2, 4),
+	(2, 5),
+	(2, 6),
+	(2, 7),
+	(3, 3),
+	(3, 4),
+	(3, 5),
+	(3, 6),
+	(3, 7),
+	(4, 4),
+	(4, 5),
+	(4, 6),
+	(4, 7),
+	(5, 5),
+	(5, 6),
+	(5, 7),
+	(6, 6),
+	(6, 7),
+	(7, 7),
+];
diff --git a/src/primitive/runtime/event.rs b/src/primitive/runtime/event.rs
new file mode 100644
index 0000000..287fb06
--- /dev/null
+++ b/src/primitive/runtime/event.rs
@@ -0,0 +1,60 @@
+// crates.io
+use scale_decode::DecodeAsType;
+use serde::Deserialize;
+use serde_json::Value;
+use subxt::{dynamic::DecodedValue, events::StaticEvent};
+// slothunter
+use crate::hunter::*;
+
+#[derive(Debug, Deserialize)]
+pub struct EResponse<E> {
+	pub data: Events<E>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Events<E> {
+	pub events: Vec<E>,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct RawEvent {
+	pub args: Value,
+	pub block: Value,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct Event<E> {
+	pub args: E,
+	pub block: BlockResponse,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct BlockResponse {
+	pub height: BlockNumber,
+}
+
+#[derive(Debug, Deserialize)]
+pub struct EBidAccepted {
+	pub amount: String,
+	#[serde(rename(deserialize = "firstSlot"))]
+	pub first_slot: u32,
+	#[serde(rename(deserialize = "lastSlot"))]
+	pub last_slot: u32,
+}
+
+#[derive(Debug, DecodeAsType)]
+pub struct EProxyExecuted {
+	pub result: StdResult<(), DecodedValue>,
+}
+impl EProxyExecuted {
+	pub fn into_dispatch_result(self) -> DispatchResult {
+		match self.result {
+			Ok(()) => Ok(()),
+			Err(v) => Err(format!("{v:?}")),
+		}
+	}
+}
+impl StaticEvent for EProxyExecuted {
+	const EVENT: &'static str = "ProxyExecuted";
+	const PALLET: &'static str = "Proxy";
+}
diff --git a/src/primitive/runtime/storage.rs b/src/primitive/runtime/storage.rs
new file mode 100644
index 0000000..7022468
--- /dev/null
+++ b/src/primitive/runtime/storage.rs
@@ -0,0 +1,19 @@
+// crates.io
+use scale_value::Value;
+use serde::Deserialize;
+// slothunter
+use crate::hunter::*;
+
+// https://github.com/paritytech/polkadot/blob/b1cc6fa14330261a305d56be36c04e9c99518993/runtime/common/src/slots/mod.rs#L117
+pub type SLeases = Vec<Option<(AccountId, Balance)>>;
+// https://github.com/paritytech/polkadot/blob/b1cc6fa14330261a305d56be36c04e9c99518993/runtime/common/src/auctions.rs#L73
+pub type SWinning = [Option<SWinner>; 36];
+pub type SWinner = (AccountId, ParaId, Balance);
+
+// https://github.com/paritytech/substrate/blob/51b2f0ed6af8dd4facb18f1a489e192fd0673f7b/frame/proxy/src/lib.rs#LL76C32-L76C32
+#[derive(Debug, Deserialize)]
+pub struct ProxyDefinition {
+	pub delegate: UnnamedWrapper<AccountId>,
+	pub proxy_type: Value<()>,
+	pub delay: BlockNumber,
+}
diff --git a/test/guide.md b/test/guide.md
new file mode 100644
index 0000000..99e8f58
--- /dev/null
+++ b/test/guide.md
@@ -0,0 +1,65 @@
+# Test guide
+## Unit test
+### Preparation
+- Install
+  - Rust toolchain
+### Test
+1. Go to the root directory of this repository and run `cargo test`
+
+## Integration test
+### Preparation
+- Install
+  - Rust toolchain
+  - Docker
+  - Docker Compose
+- Download
+  - [Polkadot v0.9.43](https://github.com/paritytech/polkadot/releases/download/v0.9.43/polkadot)
+  - [Rococo testing chainspec](#)
+- Addition
+  - Ensure that no other programs are using ports `3000`, `8000`, and `9944`
+### Basic test
+1. Go to the root directory of this repository
+2. Run `docker-compose -f test/integration/docker-compose.yml up -d`
+3. Run `cargo test --features node-test`
+### Advance test
+#### Configuration
+1. Open `test/integration/rococo.toml`
+2. Change the `para-id` if you want to test with different id
+3. Change the `leases` if you want to test with different lease(s)
+4. Change to `watch-only` to `true` if you want to test without the bid components
+5. Change the `type` to test different bidding type
+6. Adjust the `upper-limit` and `increment` to test more situation if you want
+7. Add some `webhooks` to test the notification webhook component
+   - You can use [webhook.site](https://webhook.site), the result should be listed on the left of the website
+   - You can use any other webhook listener
+8. Edit the `mail` to test the notification mail component
+   - Add some `receivers`
+   - Add a `sender`
+     - Recommending using Gmail for testing
+     - Add `username`, e.g. example@gmail.com
+     - Add `password`, e.g. [app password](https://support.google.com/accounts/answer/185833?hl=en)
+#### Test
+1. Go to the root directory of this repository
+2. Run
+   - `docker-compose -f test/integration/docker-compose.yml down && rm -rf test/integration/data/db && docker-compose -f test/integration/docker-compose.yml up -d` if you have run the basic test before
+   - `docker-compose -f test/integration/docker-compose.yml up -d` if you haven't run the basic test before
+3. Run `cargo run -- -c test/integration/rococo.toml`
+4. Open browser and navigate to [Polkadot/Substrate Portal](https://polkadot.js.org/apps/?rpc=ws://127.0.0.1:9944#/explorer)
+5. Navigate to `Developer tab -> Sudo tab -> auctions module -> newAuction call`
+6. *Optional* for crowdloan
+   1. Navigate to `Network tab -> Parachains tab -> Crowdloan tab -> Add fund button`
+   2. Set `crowdfund cap` recommend `1000 UNIT`
+   3. Set `ending block` recommend `1000`
+   3. Set `periods` recommend `(0, 0)`
+7. Submit the new auction call, remember to uncheck the `use a proxy for this call` in the pop-up window
+8. A notification should appear in the webhook and mail to indicate the start of an auction
+9. Additionally, a notification regarding the initial bid should be included in both the webhook and mail
+10. Use `Charlie` and `Dave` to bid for `2001` and `2002` and check the results
+11. Wait until the auction ends, uou should receive a notification via webhook and mail indicating that the auction has ended
+
+## Addition
+- Default real account is `//Alice`
+- Default proxy accounts are `//Alice/stash` with `ProxyType::All` and `//Bob` with `ProxyType::Auction`
+- Default parachains and their owners are `(Alice, 2000)`, `(Charlie, 2001)` and `(Dave, 2002)`
+
+All of this data is pre-set and was built from Polkadot's latest Rococo-local chain with the assistance of [Subalfred fork-off](https://subalfred.hack.ink/user/cli/state.html#command-state-fork-off).
diff --git a/test/integration/Dockerfile b/test/integration/Dockerfile
new file mode 100644
index 0000000..d2babde
--- /dev/null
+++ b/test/integration/Dockerfile
@@ -0,0 +1,10 @@
+FROM archlinux:latest
+
+COPY\
+  data/polkadot\
+  data/rococo.json.fork-off\
+  ./
+
+RUN chmod u+x polkadot
+
+ENTRYPOINT ./polkadot --unsafe-rpc-external --rpc-cors all --rpc-methods unsafe --tmp --chain rococo.json.fork-off --alice
diff --git a/test/integration/docker-compose.yml b/test/integration/docker-compose.yml
new file mode 100644
index 0000000..1fd8846
--- /dev/null
+++ b/test/integration/docker-compose.yml
@@ -0,0 +1,61 @@
+services:
+  db:
+    image: postgres:12
+    restart: always
+    volumes:
+      - ./data/db/postgres:/db/postgres
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: squid-archive
+
+  node:
+    build: .
+    ports:
+      - "9944:9944"
+    volumes:
+      - ./data/db/node:/db/node
+
+  ingest:
+    depends_on:
+      - db
+      - node
+    restart: on-failure
+    image: subsquid/substrate-ingest:firesquid
+    extra_hosts:
+    - "host.docker.internal:host-gateway"
+    command:
+      [
+        "-e",
+        "ws://host.docker.internal:9944",
+        "--out",
+        "postgres://postgres:postgres@db:5432/squid-archive"
+      ]
+
+  gateway:
+    depends_on:
+      - db
+    image: subsquid/substrate-gateway:firesquid
+    environment:
+      RUST_LOG: "substrate_gateway=info,actix_server=info"
+    command:
+      [
+        "--database-url",
+        "postgres://postgres:postgres@db:5432/squid-archive",
+        "--database-max-connections",
+        "3"
+      ]
+    ports:
+      - "8000:8000"
+
+  explorer:
+    image: subsquid/substrate-explorer:firesquid
+    environment:
+      DB_TYPE: postgres
+      DB_HOST: db
+      DB_PORT: "5432"
+      DB_NAME: "squid-archive"
+      DB_USER: "postgres"
+      DB_PASS: "postgres"
+    ports:
+      - "3000:3000"
diff --git a/test/integration/rococo.toml b/test/integration/rococo.toml
new file mode 100644
index 0000000..bdef4d0
--- /dev/null
+++ b/test/integration/rococo.toml
@@ -0,0 +1,126 @@
+# Relaychain network.
+#
+# Possible values: "kusama", "polkadot".
+network = "kusama"
+# GraphQL HTTP(S) URI.
+#
+# This line can be commented out. Otherwise, it will replace the default URI of `network`.
+graphql-endpoint = "http://127.0.0.1:3000/graphql"
+# Network WS(S) URI.
+#
+# This line can be commented out. Otherwise, it will replace the default URI of `network`.
+node-endpoint = "ws://127.0.0.1:9944"
+# Block subscription mode.
+#
+# Possible values: "best", "finalized".
+#
+# best: Subscribe to the best block, this strategy is faster and can increase your chances of
+# winning the auction, but it becomes unsafe if there is a fork.
+#
+# finalized: Subscribe to the latest finalized block.
+block-subscription-mode = "best"
+
+[bid]
+# Parachain's identity you are bidding for.
+para-id = 2000
+# Lease(s) you are bidding for.
+#
+# E.G.
+# Bid for 8 leases.
+# Example values: [0, 7], [10, 17], [100, 107]
+leases = [0, 0]
+# Watch-only mode.
+#
+# No extrinsic will be sent in this mode.
+watch-only = false
+# Bidding type.
+#
+# Possible values: "self-funded", "crowdloan".
+type = "self-funded"
+# The real account's public key.
+#
+# E.G.
+#
+# Secret Key URI `//Alice` is account:
+#   Network ID:        substrate
+#  Secret seed:       0xe5be9a5092b81bca64be81d212e7f2f9eba183bb7a90954f7b76361f6edb5c0a
+#   Public key (hex):  0xd43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d
+#   Account ID:        0xd43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d
+#   Public key (SS58): 5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY
+#   SS58 Address:      5GrwvaEF5zXb26Fz9rcQpDWS57CtERHpNehXCPcNoHGKutQY
+real = "0xd43593c715fdd31c61141abd04a99fd6822c8558854ccde39a5684e7a56da27d"
+# Delegate/proxy account's private key/seed.
+#
+# For better safety, Slothunter only allows the use of delegate/proxy accounts for bidding/contributing.
+#
+# E.G.
+# Secret Key URI `//Bob` is account:
+#   Network ID:        substrate
+#  Secret seed:       0x398f0c28f98885e046333d4a41c19cee4c37368a9832c6502f6cfd182e2aef89
+#   Public key (hex):  0x8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a48
+#   Account ID:        0x8eaf04151687736326c9fea17e25fc5287613693c912909cb226aa4794f26a48
+#   Public key (SS58): 5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty
+#   SS58 Address:      5FHneW46xGXgs5mUiveU4sbTyGBzmstUspZC92UhjJM694ty
+delegate = "0x398f0c28f98885e046333d4a41c19cee4c37368a9832c6502f6cfd182e2aef89"
+# Upper limit of the bids.
+#
+# Slothunter will stop bidding if the minimum winning amount exceeds this value.
+#
+# Generally, this value should be equal to or greater than the increment.
+upper-limit = "1000000000000000"
+# Bid increment.
+#
+# This should be at least 1 DOT/KSM.
+#
+# Generally, the minimum value(1 DOT/KSM) should help you win the auction.
+# However, if there are a lot of Slothunters or someone bids at the same time, you may lose the auction.
+# To increase your chances of winning, consider increasing this value.
+#
+# Note that this value will serve as the default bid for the first bidder in case there are no other bidders.
+#
+# E.G.
+#
+# A  : (0, 3) -> 10
+# B  : (0, 1) -> 10
+# C  : (2, 2) -> 5
+# D  : (1, 3) -> 11
+# E  : (3, 3) -> 16
+# You: (1, 2) -> x
+#
+# Current winners are `B`, `C`, and `E`, the threshold is calculated as `2 * 10 + 5 + 16 = 41`.
+# Slothunter will calculate the value of `x` which is equal to `12` and then bid with the amount of `(x + increment)`.
+# The calculation for winning the bid would be: `(x(12) + increment(1)) * 2 + 16 = 42 > 41`, hence, win.
+# Since DOT's decimals are ten, there should be ten zeros here.
+increment = "10000000000000"
+
+[notification]
+# Notification webhooks.
+#
+# Periodic notification will be sent to the following webhook addresses.
+#
+# If you don't wish to use any webhooks, leave this field empty.
+#
+# E.G.
+# This can be integrated into:
+# - A Discord channel using a Discord webhook.
+# - A Telegram channel using a Telegram bot.
+# - A Slack channel using a Slack webhook.
+webhooks = []
+# Notification mail configurations.
+#
+# If you don't wish to use any mail notifications, keep this(`[notification.mail]`) whole section commented out.
+[notification.mail]
+# Notification will be sent to the following recipients.
+receivers = []
+[notification.mail.sender]
+# Sender's mail password:
+# Note:
+#   This is usually an app-specific password instead of your account password.
+#   For example, you can generate an app-spceific password by following the instructions provided in this link: https://support.google.com/accounts/answer/185833?hl=en.
+password = "PASSWORD"
+# Sender's mail address.
+username = "USERNAME"
+# SMTP server address.
+#
+# The default value is the SMTP server address of Gmail.
+smtp = "smtp.gmail.com"