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fix: improve sync timestamp handling with separate server and local watermarks

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Gabriel20xx
2025-10-26 17:40:29 +01:00
parent e073a6ffda
commit 5b06c3fae1
1 changed files with 42 additions and 15 deletions
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CollabTableAndroid/app/src/main/java/com/collabtable/app/data/repository/SyncRepository.kt
+42 -15
View File
@@ -17,12 +17,35 @@ class SyncRepository(context: Context) {
private val api = ApiClient.api
private val prefs = appContext.getSharedPreferences("collab_table_prefs", Context.MODE_PRIVATE)
private fun getLastSyncTimestamp(): Long {
return prefs.getLong("last_sync_timestamp", 0)
// We keep separate watermarks to avoid clock-skew issues:
// - server watermark: server-assigned timestamp for fetching server changes
// - local watermark: device local time for selecting local changes to upload
private fun getLastServerSyncTs(): Long {
// Backward-compat: fall back to legacy key if new one is absent
if (!prefs.contains("last_server_sync_ts")) {
return prefs.getLong("last_sync_timestamp", 0)
}
return prefs.getLong("last_server_sync_ts", 0)
}
private fun setLastSyncTimestamp(timestamp: Long) {
prefs.edit().putLong("last_sync_timestamp", timestamp).apply()
private fun setLastServerSyncTs(ts: Long) {
prefs.edit()
.putLong("last_server_sync_ts", ts)
// also update legacy for safety
.putLong("last_sync_timestamp", ts)
.apply()
}
private fun getLastLocalSyncTs(): Long {
// Backward-compat: if missing, use legacy key value
if (!prefs.contains("last_local_sync_ts")) {
return prefs.getLong("last_sync_timestamp", 0)
}
return prefs.getLong("last_local_sync_ts", 0)
}
private fun setLastLocalSyncTs(ts: Long) {
prefs.edit().putLong("last_local_sync_ts", ts).apply()
}
suspend fun performSync(): Result<Unit> =
@@ -30,17 +53,18 @@ class SyncRepository(context: Context) {
// Prevent overlapping syncs across screens/viewmodels
syncMutex.withLock {
try {
val lastSync = getLastSyncTimestamp()
val isInitialSync = lastSync == 0L
val lastServerTs = getLastServerSyncTs()
val lastLocalTs = getLastLocalSyncTs()
val isInitialSync = lastServerTs == 0L
if (isInitialSync) {
Logger.i("Sync", "[SYNC] Starting initial sync with server")
}
// Gather local changes since last sync
val localLists = database.listDao().getListsUpdatedSince(lastSync)
val localFields = database.fieldDao().getFieldsUpdatedSince(lastSync)
val localItems = database.itemDao().getItemsUpdatedSince(lastSync)
val localValues = database.itemValueDao().getValuesUpdatedSince(lastSync)
val localLists = database.listDao().getListsUpdatedSince(lastLocalTs)
val localFields = database.fieldDao().getFieldsUpdatedSince(lastLocalTs)
val localItems = database.itemDao().getItemsUpdatedSince(lastLocalTs)
val localValues = database.itemValueDao().getValuesUpdatedSince(lastLocalTs)
// Only log send when there are actual local changes
val localTotal = localLists.size + localFields.size + localItems.size + localValues.size
@@ -56,7 +80,7 @@ class SyncRepository(context: Context) {
// Send to server and get updates
val syncRequest =
SyncRequest(
lastSyncTimestamp = lastSync,
lastSyncTimestamp = lastServerTs,
lists = localLists,
fields = localFields,
items = localItems,
@@ -69,7 +93,8 @@ class SyncRepository(context: Context) {
if (response.code() == 401) {
// Unauthorized: likely bad/missing password. Reset sync baseline and surface a clear error.
Logger.e("Sync", "[ERROR] Unauthorized (401). Check server password in Settings.")
setLastSyncTimestamp(0)
setLastServerSyncTs(0)
setLastLocalSyncTs(0)
return@withContext Result.failure(Exception("Unauthorized (401). Please verify server password."))
}
Logger.e("Sync", "[ERROR] Sync failed: HTTP ${response.code()}")
@@ -152,8 +177,9 @@ class SyncRepository(context: Context) {
}
}
// Update last sync timestamp
setLastSyncTimestamp(syncResponse.serverTimestamp)
// Update watermarks: server ts from response, local ts from device clock now
setLastServerSyncTs(syncResponse.serverTimestamp)
setLastLocalSyncTs(System.currentTimeMillis())
if (isInitialSync) {
Logger.i("Sync", "[SYNC] Initial sync completed")
@@ -166,7 +192,8 @@ class SyncRepository(context: Context) {
}
// If WS indicated unauthorized, align behavior with HTTP path
if (e.message?.contains("Unauthorized") == true) {
setLastSyncTimestamp(0)
setLastServerSyncTs(0)
setLastLocalSyncTs(0)
}
Logger.e("Sync", "[ERROR] Sync error: ${e.message}")
return@withContext Result.failure(e)