chore(GODT-2551): Store and Recover Last User Agent from Vault

internal/vault/settings.go

@@ -225,3 +225,22 @@ func (vault *Vault) SetMaxSyncMemory(maxMemory uint64) error {
 		data.Settings.MaxSyncMemory = maxMemory
 	})
 }
+
+// GetLastUserAgent returns the last user agent recorded by bridge.
+func (vault *Vault) GetLastUserAgent() string {
+	v := vault.get().Settings.LastUserAgent
+
+	// Handle case where there may be no value.
+	if len(v) == 0 {
+		v = DefaultUserAgent
+	}
+
+	return v
+}
+
+// SetLastUserAgent store the last user agent recorded by bridge.
+func (vault *Vault) SetLastUserAgent(userAgent string) error {
+	return vault.mod(func(data *Data) {
+		data.Settings.LastUserAgent = userAgent
+	})
+}

internal/vault/settings_test.go

@@ -216,3 +216,11 @@ func TestVault_Settings_MaxSyncMemory(t *testing.T) {
 	// Check the default first start value.
 	require.Equal(t, vault.DefaultMaxSyncMemory, s.GetMaxSyncMemory())
 }
+
+func TestVault_Settings_LastUserAgent(t *testing.T) {
+	// create a new test vault.
+	s := newVault(t)
+
+	// Check the default first start value.
+	require.Equal(t, vault.DefaultUserAgent, s.GetLastUserAgent())
+}

internal/vault/types_settings.go

@@ -46,12 +46,15 @@ type Settings struct {
 
 	MaxSyncMemory uint64
 
+	LastUserAgent string
+
 	// **WARNING**: These entry can't be removed until they vault has proper migration support.
 	SyncWorkers int
 	SyncAttPool int
 }
 
 const DefaultMaxSyncMemory = 2 * 1024 * uint64(1024*1024)
+const DefaultUserAgent = "UnknownClient/0.0.1"
 
 func GetDefaultSyncWorkerCount() int {
 	const minSyncWorkers = 16
@@ -91,5 +94,7 @@ func newDefaultSettings(gluonDir string) Settings {
 		MaxSyncMemory: DefaultMaxSyncMemory,
 		SyncWorkers:   syncWorkers,
 		SyncAttPool:   syncWorkers,
+
+		LastUserAgent: DefaultUserAgent,
 	}
 }