From 692140fc0153cbf0e4ea93eed1fdb0d0a216e823 Mon Sep 17 00:00:00 2001
From: Adam Tucker <adam@osmosis.team>
Date: Fri, 27 Sep 2024 01:05:24 -0600
Subject: [PATCH] chore: regenerate addrbook.json for in-place-testnet (#21941)

(cherry picked from commit dc09671841e1f98e1695047600b7c397f273eb64)
---
 CHANGELOG.md    |  1 +
 server/start.go | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index a633c7dbec3e..4f49693eab4b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -130,6 +130,7 @@ Every module contains its own CHANGELOG.md. Please refer to the module you are i
 * (internal) [#21412](https://github.com/cosmos/cosmos-sdk/pull/21412) Using unsafe.String and unsafe.SliceData.
 * (client) [#21436](https://github.com/cosmos/cosmos-sdk/pull/21436) Use `address.Codec` from client.Context in `tx.Sign`.
 * (x/genutil) [#21249](https://github.com/cosmos/cosmos-sdk/pull/21249) Incremental JSON parsing for AppGenesis where possible.
+* (testnet) [#21941](https://github.com/cosmos/cosmos-sdk/pull/21941) Regenerate addrbook.json for in place testnet.
 
 ### Bug Fixes
 
diff --git a/server/start.go b/server/start.go
index cff5807fbdb4..f9ae56676305 100644
--- a/server/start.go
+++ b/server/start.go
@@ -9,6 +9,7 @@ import (
 	"io"
 	"net"
 	"os"
+	"path/filepath"
 	"runtime/pprof"
 	"strings"
 	"time"
@@ -780,6 +781,17 @@ func testnetify[T types.Application](ctx *Context, testnetAppCreator types.AppCr
 		return nil, err
 	}
 
+	// Regenerate addrbook.json to prevent peers on old network from causing error logs.
+	addrBookPath := filepath.Join(config.RootDir, "config", "addrbook.json")
+	if err := os.Remove(addrBookPath); err != nil && !os.IsNotExist(err) {
+		return nil, fmt.Errorf("failed to remove existing addrbook.json: %w", err)
+	}
+
+	emptyAddrBook := []byte("{}")
+	if err := os.WriteFile(addrBookPath, emptyAddrBook, 0o600); err != nil {
+		return nil, fmt.Errorf("failed to create empty addrbook.json: %w", err)
+	}
+
 	// Load the comet genesis doc provider.
 	genDocProvider := node.DefaultGenesisDocProviderFunc(config)