hello-world on Rust 2015 (#486)

build.sbt

@@ -50,9 +50,14 @@ lazy val `vm-hello-world` = (project in file("vm/examples/hello-world"))
     rustVmExample("hello-world")
   )
 
-lazy val `vm-hello-world2` = (project in file("vm/examples/hello-world2/app"))
+lazy val `vm-hello-world2-2015` = (project in file("vm/examples/hello-world2/app-2015"))
   .settings(
-    rustVmExample("hello-world2/app")
+    rustVmExample("hello-world2/app-2015")
+  )
+
+lazy val `vm-hello-world2-2018` = (project in file("vm/examples/hello-world2/app-2018"))
+  .settings(
+    rustVmExample("hello-world2/app-2018")
   )
 
 lazy val `vm-hello-world2-runner` = (project in file("vm/examples/hello-world2/runner"))
@@ -68,7 +73,8 @@ lazy val `vm-hello-world2-runner` = (project in file("vm/examples/hello-world2/r
       cryptoHashing,
     )
   )
-  .dependsOn(vm, `vm-hello-world2`)
+  .dependsOn(vm, `vm-hello-world2-2015`)
+  .dependsOn(vm, `vm-hello-world2-2018`)
   .enablePlugins(AutomateHeaderPlugin)
 
 lazy val `vm-llamadb` = (project in file("vm/examples/llamadb"))

vm/examples/hello-world2/app-2015/Cargo.toml

@@ -0,0 +1,21 @@
+[package]
+name = "hello_world2_2015"
+version = "0.1.0"
+authors = ["Fluence Labs"]
+publish = false
+description = "Just a demo application for Fluence with logging ability"
+
+[lib]
+name = "hello_world2_2015"
+path = "src/lib.rs"
+crate-type = ["cdylib"]
+
+[profile.release]
+debug = false
+lto = true
+opt-level = "z"
+panic = "abort"
+
+[dependencies]
+log = "0.4"
+fluence = { version = "0.0.10", features = ["export_allocator", "wasm_logger"] }

vm/examples/hello-world2/app-2015/src/lib.rs

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2018 Fluence Labs Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+//! A simple demo application for Fluence.
+#![feature(custom_attribute)]
+extern crate fluence;
+
+extern crate log;
+
+use fluence::sdk::*;
+use log::info;
+
+fn init() {
+    logger::WasmLogger::init_with_level(log::Level::Info).unwrap();
+}
+
+#[invocation_handler(init_fn = init)]
+fn greeting(name: String) -> String {
+    info!("{} has been successfully greeted", name);
+    format!("Hello, world! From user {}", name)
+}

vm/examples/hello-world2/app/Cargo.toml → vm/examples/hello-world2/app-2018/Cargo.toml

@@ -1,13 +1,13 @@
 [package]
-name = "hello_world2"
+name = "hello_world2_2018"
 version = "0.1.0"
 authors = ["Fluence Labs"]
 publish = false
 description = "Just a demo application for Fluence with logging ability"
 edition = "2018"
 
 [lib]
-name = "hello_world2"
+name = "hello_world2_2018"
 path = "src/lib.rs"
 crate-type = ["cdylib"]
 

vm/examples/hello-world2/app-2018/rust-toolchain

@@ -0,0 +1 @@
+nightly

vm/examples/hello-world2/runner/src/main/scala/HelloWorldRunner.scala

@@ -22,7 +22,8 @@ import fluence.vm.{VmError, WasmVm}
 import scala.language.higherKinds
 
 /**
- * A hello-world2 example runner that is an example of possible debugger of `hello_world2` backend application.
+ * A hello-world2 examples runner that is an example of possible debugger of `hello_world2` backend applications
+ * (written both on Rust 2015 and 2018).
  * Internally it creates WasmVm and invokes the application with some parameters. Also can be used as a template for
  * debugging other backend applications.
  */
@@ -46,9 +47,9 @@ object HelloWorldRunner extends IOApp {
       /*
         In correct execution the console output should be like this:
 
-        INFO  [hello_world2] John has been successfully greeted
-        INFO  [hello_world2]  has been successfully greeted
-        INFO  [hello_world2] Peter has been successfully greeted
+        INFO  [hello_world2_2018] John has been successfully greeted
+        INFO  [hello_world2_2018]  has been successfully greeted
+        INFO  [hello_world2_2018] Peter has been successfully greeted
         [SUCCESS] Execution Results.
         initState=ByteVector(32 bytes, 0x6f3ebb11cb3266aaf12c1eea3f6892c78f563dccb43d6c4b4b153ea10be3decf)
         result1=Hello from Fluence to John
@@ -81,7 +82,7 @@ object HelloWorldRunner extends IOApp {
         println(s"Starts for input file $value")
         value
       case None ⇒
-        throw new IllegalArgumentException("Full path for wasm file is required!")
+        throw new IllegalArgumentException("Please provide a full path for wasm file as the first CLI argument!")
     }
   }