From 55313bb789f3c4a178c0b3d7dc39e1404d522236 Mon Sep 17 00:00:00 2001
From: Jernej Kos <jernej@kos.mx>
Date: Thu, 19 Oct 2023 09:40:03 +0200
Subject: [PATCH] feat: Automatically migrate old chain contexts for known
 networks

---
 config/config.go  | 34 ++++++++++++++++++++++++++++++++--
 config/default.go |  9 +++++++++
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/config/config.go b/config/config.go
index 572ab379..bd9a687a 100644
--- a/config/config.go
+++ b/config/config.go
@@ -170,16 +170,46 @@ func (cfg *Config) Save() error {
 	return cfg.viper.WriteConfig()
 }
 
-// Migrate migrates the given wallet config entry to the latest version and returns true, if any changes were needed.
+// Migrate migrates the given wallet config entry to the latest version and returns true, if any
+// changes were needed.
 func (cfg *Config) Migrate() (bool, error) {
-	changes, err := cfg.Wallet.Migrate()
+	var changes bool
+
+	// Networks.
+	changes = changes || cfg.migrateNetworks()
+
+	// Wallets.
+	walletChanges, err := cfg.Wallet.Migrate()
 	if err != nil {
 		return false, fmt.Errorf("failed to migrate wallet configuration: %w", err)
 	}
+	changes = changes || walletChanges
 
 	return changes, nil
 }
 
+func (cfg *Config) migrateNetworks() bool {
+	var changes bool
+	for name, net := range cfg.Networks.All {
+		defaultCfg, knownDefault := Default.Networks.All[name]
+		oldChainContexts, knownOld := OldNetworks[name]
+		if !knownDefault || !knownOld {
+			continue
+		}
+
+		for _, oldChainContext := range oldChainContexts {
+			if net.ChainContext == oldChainContext {
+				// If old chain context is known, replace with default.
+				net.ChainContext = defaultCfg.ChainContext
+				changes = true
+				break
+			}
+		}
+	}
+
+	return changes
+}
+
 // Validate performs config validation.
 func (cfg *Config) Validate() error {
 	if err := cfg.Networks.Validate(); err != nil {
diff --git a/config/default.go b/config/default.go
index f9d7a148..7b8d4174 100644
--- a/config/default.go
+++ b/config/default.go
@@ -8,3 +8,12 @@ import (
 var Default = Config{
 	Networks: config.DefaultNetworks,
 }
+
+// OldNetworks contains information about old versions (e.g. chain contexts) of known networks so
+// they can be automatically migrated.
+var OldNetworks = map[string][]string{
+	// Testnet.
+	"testnet": {
+		"50304f98ddb656620ea817cc1446c401752a05a249b36c9b90dba4616829977a", // 2022-03-03
+	},
+}