feat: migrate nodeAliasCache to room

app/src/main/java/com/bitcointxoko/gudariwallet/api/NodeAliasClient.kt.kt

@@ -7,10 +7,10 @@ import java.util.concurrent.TimeUnit
 
 /**
  * Resolves a Lightning node pubkey to a human-readable alias.
- * Tries 1ml.com first, falls back to mempool.space.
+ * Tries mempool.space first, falls back to 1ml.com.
  * Returns null if neither source has the node or both fail.
  */
-class NodeAliasService {
+class NodeAliasClient {
 
     private val client = OkHttpClient.Builder()
         .connectTimeout(5, TimeUnit.SECONDS)
@@ -34,15 +34,15 @@ class NodeAliasService {
     suspend fun resolveAlias(pubkey: String): String? {
         if (pubkey.isBlank()) return null
 
-        // 1. Try 1ml.com
+        // 1. Try mempool.space
-        runCatching { oneMlApi.getNode(pubkey) }
+        runCatching { mempoolApi.getNode(pubkey) }
             .onSuccess { response ->
                 val alias = response.alias?.takeIf { it.isNotBlank() }
                 if (alias != null) return alias
             }
 
-        // 2. Fall back to mempool.space
+        // 2. Fall back to 1ml.com
-        runCatching { mempoolApi.getNode(pubkey) }
+        runCatching { oneMlApi.getNode(pubkey) }
             .onSuccess { response ->
                 val alias = response.alias?.takeIf { it.isNotBlank() }
                 if (alias != null) return alias

app/src/main/java/com/bitcointxoko/gudariwallet/data/LNbitsNodeAliasRepository.kt

@@ -10,10 +10,10 @@ import kotlinx.coroutines.flow.StateFlow
 class LNbitsNodeAliasRepository(
     private val service: NodeAliasService
 ) : NodeAliasRepository {
-
     override val aliases: StateFlow<Map<String, String>>
         get() = service.aliases
-
     override suspend fun resolve(pubkey: String): String? =
         service.resolve(pubkey)
+    override suspend fun warmUp() = service.warmUp()
+
 }

app/src/main/java/com/bitcointxoko/gudariwallet/data/LNbitsWalletRepository.kt

@@ -1,10 +1,8 @@
 package com.bitcointxoko.gudariwallet.data
 
-import android.content.Context
 import android.net.Uri
 import android.util.Log
 import com.bitcointxoko.gudariwallet.api.*
-import com.bitcointxoko.gudariwallet.api.LNbitsClient.httpClient
 import com.bitcointxoko.gudariwallet.security.SecretStore
 import com.bitcointxoko.gudariwallet.util.LnurlBech32
 import com.bitcointxoko.gudariwallet.util.LnurlMetadataParser
@@ -15,9 +13,6 @@ private const val TAG = "LNbitsWalletRepo"
 class LNbitsWalletRepository(
     private val api: LNbitsApi,
     private val secrets: SecretStore,
-    private val context         : Context,
-    private val nodeAliasService: com.bitcointxoko.gudariwallet.service.NodeAliasService =
-        com.bitcointxoko.gudariwallet.service.NodeAliasService(httpClient, context),
 ) : WalletRepository {
 
     // ── Balance ───────────────────────────────────────────────────────────────
@@ -157,7 +152,7 @@ class LNbitsWalletRepository(
                     append(amountMsat)
                     if (!comment.isNullOrBlank()) {
                             append("&comment=")
-                            append(android.net.Uri.encode(comment))
+                            append(Uri.encode(comment))
                         }
                 }
             Log.d(TAG, "LNURL [FETCH INVOICE] callback=$callbackUrl")

app/src/main/java/com/bitcointxoko/gudariwallet/data/NodeAliasCacheRepository.kt

@@ -0,0 +1,68 @@
+package com.bitcointxoko.gudariwallet.data
+
+import android.content.Context
+import android.util.Log
+import com.bitcointxoko.gudariwallet.data.db.AppDatabase
+import com.bitcointxoko.gudariwallet.data.db.NodeAliasCacheEntity
+import com.bitcointxoko.gudariwallet.util.WalletConstants
+
+private const val TAG = "NodeAliasCacheRepository"
+
+class NodeAliasCacheRepository(context: Context) {
+
+    private val dao = AppDatabase.getInstance(context).nodeAliasCacheDao()
+
+    /**
+     * Returns a cached alias for [pubkey] if it exists and is within
+     * [WalletConstants.ALIAS_CACHE_TTL_MS]. Returns null on miss or stale.
+     */
+    suspend fun get(pubkey: String): String? {
+        val entry = dao.getByPubkey(pubkey) ?: run {
+            Log.d(TAG, "ALIAS [CACHE MISS ] $pubkey")
+            return null
+        }
+        val ageMs = System.currentTimeMillis() - entry.savedAt
+        return if (ageMs < WalletConstants.ALIAS_CACHE_TTL_MS) {
+            Log.d(TAG, "ALIAS [CACHE HIT ] $pubkey → \"${entry.alias}\" (age ${ageMs / 1000}s)")
+            entry.alias
+        } else {
+            Log.d(TAG, "ALIAS [CACHE STALE] $pubkey (age ${ageMs / 1000}s) — will refetch")
+            null
+        }
+    }
+
+    /** Upsert an alias into the Room cache. */
+    suspend fun put(pubkey: String, alias: String) {
+        dao.insert(
+            NodeAliasCacheEntity(
+                pubkey  = pubkey,
+                alias   = alias,
+                savedAt = System.currentTimeMillis()
+            )
+        )
+        Log.d(TAG, "ALIAS [PERSIST   ] $pubkey → \"$alias\"")
+    }
+
+    /**
+     * Load all non-stale entries from Room as a plain map.
+     * Used to seed the StateFlow on startup — replaces [loadPersistedCache].
+     */
+    suspend fun loadAll(): Map<String, String> {
+        val now = System.currentTimeMillis()
+        return dao.getAll()
+            .filter { now - it.savedAt < WalletConstants.ALIAS_PERSIST_TTL_MS }
+            .associate { it.pubkey to it.alias }
+            .also { Log.d(TAG, "ALIAS [PERSIST   ] Loaded ${it.size} non-stale entries from Room") }
+    }
+
+    /** Remove a single entry. */
+    suspend fun remove(pubkey: String) {
+        dao.deleteByPubkey(pubkey)
+    }
+
+    /** Wipe the entire alias cache — mirrors [clearPersistedCache]. */
+    suspend fun clearAll() {
+        dao.deleteAll()
+        Log.d(TAG, "ALIAS [PERSIST   ] Cache cleared")
+    }
+}

app/src/main/java/com/bitcointxoko/gudariwallet/data/NodeAliasRepository.kt

@@ -18,4 +18,5 @@ interface NodeAliasRepository {
      * Results are cached — repeated calls for the same pubkey are cheap.
      */
     suspend fun resolve(pubkey: String): String?
+    suspend fun warmUp()
 }

app/src/main/java/com/bitcointxoko/gudariwallet/data/db/AppDatabase.kt

@@ -9,8 +9,12 @@ import androidx.room.migration.Migration
 import androidx.sqlite.db.SupportSQLiteDatabase
 
 @Database(
-    entities = [PaymentRecordEntity::class, LnurlCacheEntity::class],
+    entities = [
-    version = 2,
+        PaymentRecordEntity::class,
+        LnurlCacheEntity::class,
+        NodeAliasCacheEntity::class,   // ← added
+    ],
+    version = 3,                       // ← bumped
     exportSchema = false
 )
 @TypeConverters(PaymentConverters::class)
@@ -18,6 +22,7 @@ abstract class AppDatabase : RoomDatabase() {
 
     abstract fun paymentDao(): PaymentDao
     abstract fun lnurlCacheDao(): LnurlCacheDao
+    abstract fun nodeAliasCacheDao(): NodeAliasCacheDao   // ← added
 
     companion object {
         @Volatile private var INSTANCE: AppDatabase? = null
@@ -37,6 +42,21 @@ abstract class AppDatabase : RoomDatabase() {
             }
         }
 
+        private val MIGRATION_2_3 = object : Migration(2, 3) {   // ← added
+            override fun migrate(db: SupportSQLiteDatabase) {
+                db.execSQL(
+                    """
+                    CREATE TABLE IF NOT EXISTS `node_alias_cache` (
+                        `pubkey`  TEXT    NOT NULL,
+                        `alias`   TEXT    NOT NULL,
+                        `savedAt` INTEGER NOT NULL,
+                        PRIMARY KEY(`pubkey`)
+                    )
+                    """.trimIndent()
+                )
+            }
+        }
+
         fun getInstance(context: Context): AppDatabase =
             INSTANCE ?: synchronized(this) {
                 INSTANCE ?: Room.databaseBuilder(
@@ -44,7 +64,7 @@ abstract class AppDatabase : RoomDatabase() {
                     AppDatabase::class.java,
                     "gudari_wallet.db"
                 )
-                    .addMigrations(MIGRATION_1_2)
+                    .addMigrations(MIGRATION_1_2, MIGRATION_2_3)   // ← added
                     .build()
                     .also { INSTANCE = it }
             }

app/src/main/java/com/bitcointxoko/gudariwallet/data/db/NodeAliasCacheDao.kt

@@ -0,0 +1,25 @@
+package com.bitcointxoko.gudariwallet.data.db
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.OnConflictStrategy
+import androidx.room.Query
+
+@Dao
+interface NodeAliasCacheDao {
+
+    @Insert(onConflict = OnConflictStrategy.REPLACE)
+    suspend fun insert(entry: NodeAliasCacheEntity)
+
+    @Query("SELECT * FROM node_alias_cache WHERE pubkey = :pubkey LIMIT 1")
+    suspend fun getByPubkey(pubkey: String): NodeAliasCacheEntity?
+
+    @Query("SELECT * FROM node_alias_cache")
+    suspend fun getAll(): List<NodeAliasCacheEntity>
+
+    @Query("DELETE FROM node_alias_cache WHERE pubkey = :pubkey")
+    suspend fun deleteByPubkey(pubkey: String)
+
+    @Query("DELETE FROM node_alias_cache")
+    suspend fun deleteAll()
+}

app/src/main/java/com/bitcointxoko/gudariwallet/data/db/NodeAliasCacheEntity.kt

@@ -0,0 +1,12 @@
+package com.bitcointxoko.gudariwallet.data.db
+
+import androidx.room.Entity
+import androidx.room.PrimaryKey
+
+@Entity(tableName = "node_alias_cache")
+data class NodeAliasCacheEntity(
+    @PrimaryKey
+    val pubkey: String,   // node public key
+    val alias: String,    // resolved human-readable alias
+    val savedAt: Long     // epoch ms — used for TTL checks
+)

app/src/main/java/com/bitcointxoko/gudariwallet/service/NodeAliasService.kt

@@ -1,184 +1,54 @@
 package com.bitcointxoko.gudariwallet.service
 
 import android.content.Context
-import android.content.SharedPreferences
 import android.util.Log
-import com.bitcointxoko.gudariwallet.util.WalletConstants
+import com.bitcointxoko.gudariwallet.api.NodeAliasClient as NodeAliasApiClient
-import com.google.gson.Gson
+import com.bitcointxoko.gudariwallet.data.NodeAliasCacheRepository
-import com.google.gson.reflect.TypeToken
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.flow.asStateFlow
-import kotlinx.coroutines.withContext
-import okhttp3.OkHttpClient
-import okhttp3.Request
-import java.util.concurrent.ConcurrentHashMap
 
 private const val TAG = "NodeAliasService"
 
 class NodeAliasService(
-    private val httpClient : OkHttpClient,
+    private val apiClient: NodeAliasApiClient,   // ← injected, not duplicated
-    private val context    : Context
+    context: Context
 ) {
-
+    private val repo = NodeAliasCacheRepository(context)
-    // ── Persistence ───────────────────────────────────────────────────────────
-
-    private val prefs: SharedPreferences = context.getSharedPreferences(
-        WalletConstants.ALIAS_PREFS_NAME, Context.MODE_PRIVATE
-    )
-    private val gson = Gson()
-
-    // ── In-memory alias cache ─────────────────────────────────────────────────
-
-    private data class CachedAlias(val alias: String, val fetchedAt: Long)
-
-    // Type token for Gson deserialisation
-    private val cacheType = object : TypeToken<Map<String, CachedAlias>>() {}.type
-
-    private val cache = ConcurrentHashMap<String, CachedAlias>()
-
-    // ── Shared alias StateFlow — all screens collect this ─────────────────────
 
     private val _aliases = MutableStateFlow<Map<String, String>>(emptyMap())
     val aliases: StateFlow<Map<String, String>> = _aliases.asStateFlow()
 
-    // ── Init — load persisted cache from SharedPreferences ────────────────────
+    suspend fun warmUp() {
-
+        _aliases.value = repo.loadAll()
-    init {
-        loadPersistedCache()
     }
 
-    private fun loadPersistedCache() {
-        val json = prefs.getString(WalletConstants.ALIAS_PREFS_KEY, null) ?: run {
-            Log.d(TAG, "ALIAS [PERSIST   ] No persisted cache found — starting fresh")
-            return
-        }
-
-        runCatching {
-            val persisted: Map<String, CachedAlias> = gson.fromJson(json, cacheType)
-            val now       = System.currentTimeMillis()
-            var loaded    = 0
-            var dropped   = 0
-
-            persisted.forEach { (pubkey, entry) ->
-                val ageMs = now - entry.fetchedAt
-                if (ageMs < WalletConstants.ALIAS_PERSIST_TTL_MS) {
-                    cache[pubkey] = entry
-                    loaded++
-                } else {
-                    dropped++
-                    Log.d(TAG, "ALIAS [PERSIST   ] Dropped stale entry for $pubkey (age ${ageMs / 3_600_000}h)")
-                }
-            }
-
-            // Seed the StateFlow with everything we loaded
-            _aliases.value = cache.mapValues { it.value.alias }
-
-            Log.d(TAG, "ALIAS [PERSIST   ] Loaded $loaded entries, dropped $dropped stale entries")
-        }.onFailure { e ->
-            Log.w(TAG, "ALIAS [PERSIST   ] Failed to deserialise cache — starting fresh: ${e.message}")
-        }
-    }
-
-    private fun persistCache() {
-        runCatching {
-            val json = gson.toJson(cache)
-            prefs.edit().putString(WalletConstants.ALIAS_PREFS_KEY, json).apply()
-            Log.d(TAG, "ALIAS [PERSIST   ] Wrote ${cache.size} entries to SharedPreferences")
-        }.onFailure { e ->
-            Log.w(TAG, "ALIAS [PERSIST   ] Failed to write cache: ${e.message}")
-        }
-    }
-
-    // ── Public API ────────────────────────────────────────────────────────────
-
     suspend fun resolve(pubkey: String): String? {
-        val now = System.currentTimeMillis()
+        // 1. Room cache hit
-
+        repo.get(pubkey)?.let {
-        cache[pubkey]?.let { entry ->
+            Log.d(TAG, "ALIAS [CACHE HIT ] $pubkey → \"$it\"")
-            if (now - entry.fetchedAt < WalletConstants.ALIAS_CACHE_TTL_MS) {
+            return it
-                Log.d(TAG, "ALIAS [CACHE HIT ] $pubkey → \"${entry.alias}\" (age ${(now - entry.fetchedAt) / 1000}s)")
-                return entry.alias
-            } else {
-                Log.d(TAG, "ALIAS [CACHE STALE] $pubkey (age ${(now - entry.fetchedAt) / 1000}s) — refetching")
         }
-        } ?: Log.d(TAG, "ALIAS [CACHE MISS ] $pubkey — fetching from network")
 
-        val alias = fetchFromNetwork(pubkey)
+        // 2. Network via api/NodeAliasService (Retrofit, typed responses)
-
+        Log.d(TAG, "ALIAS [CACHE MISS] $pubkey — fetching from network")
-        if (alias == null) {
+        val alias = apiClient.resolveAlias(pubkey) ?: run {
-            Log.w(TAG, "ALIAS [NOT FOUND  ] $pubkey — no alias from mempool or 1ml")
+            Log.w(TAG, "ALIAS [NOT FOUND ] $pubkey")
             return null
         }
 
-        // Update in-memory cache
+        // 3. Persist to Room
-        cache[pubkey] = CachedAlias(alias = alias, fetchedAt = System.currentTimeMillis())
+        repo.put(pubkey, alias)
 
-        // Publish to shared StateFlow
+        // 4. Publish to StateFlow
         _aliases.value = _aliases.value + (pubkey to alias)
 
-        // Persist to SharedPreferences
+        Log.d(TAG, "ALIAS [FETCHED   ] $pubkey → \"$alias\"")
-        persistCache()
-
-        Log.d(TAG, "ALIAS [API FETCHED] $pubkey → \"$alias\"")
         return alias
     }
 
-    /** Clears in-memory cache, StateFlow, and persisted SharedPreferences entry. */
+    suspend fun clearPersistedCache() {
-    fun clearPersistedCache() {
+        repo.clearAll()
-        cache.clear()
         _aliases.value = emptyMap()
-        prefs.edit().remove(WalletConstants.ALIAS_PREFS_KEY).apply()
-        Log.d(TAG, "ALIAS [PERSIST   ] Cache cleared")
-    }
-
-    // ── Private helpers ───────────────────────────────────────────────────────
-
-    private suspend fun fetchFromNetwork(pubkey: String): String? = withContext(Dispatchers.IO) {
-        Log.d(TAG, "ALIAS [TRYING     ] mempool.space for $pubkey")
-        val mempoolResult = fetchFromMempool(pubkey)
-        if (mempoolResult != null) {
-            Log.d(TAG, "ALIAS [SOURCE     ] mempool.space resolved $pubkey → \"$mempoolResult\"")
-            return@withContext mempoolResult
-        }
-        Log.d(TAG, "ALIAS [TRYING     ] 1ml.com fallback for $pubkey")
-        val mlResult = fetchFrom1ml(pubkey)
-        if (mlResult != null) {
-            Log.d(TAG, "ALIAS [SOURCE     ] 1ml.com resolved $pubkey → \"$mlResult\"")
-        }
-        mlResult
-    }
-
-    private fun fetchFromMempool(pubkey: String): String? {
-        return try {
-            val request = Request.Builder()
-                .url("https://mempool.space/api/v1/lightning/nodes/$pubkey")
-                .build()
-            httpClient.newCall(request).execute().use { response ->
-                if (!response.isSuccessful) return null
-                val body = response.body?.string() ?: return null
-                Regex(""""alias"\s*:\s*"([^"]+)"""").find(body)?.groupValues?.get(1)
-            }
-        } catch (e: Exception) {
-            Log.w(TAG, "mempool.space lookup failed for $pubkey: ${e.message}")
-            null
-        }
-    }
-
-    private fun fetchFrom1ml(pubkey: String): String? {
-        return try {
-            val request = Request.Builder()
-                .url("https://1ml.com/node/$pubkey/json")
-                .build()
-            httpClient.newCall(request).execute().use { response ->
-                if (!response.isSuccessful) return null
-                val body = response.body?.string() ?: return null
-                Regex(""""alias"\s*:\s*"([^"]+)"""").find(body)?.groupValues?.get(1)
-            }
-        } catch (e: Exception) {
-            Log.w(TAG, "1ml.com lookup failed for $pubkey: ${e.message}")
-            null
-        }
     }
 }

app/src/main/java/com/bitcointxoko/gudariwallet/ui/WalletViewModel.kt

@@ -67,6 +67,7 @@ class WalletViewModel(
     init {
         observePaymentEvents()
         fetchLightningAddress()
+        viewModelScope.launch { aliasRepo.warmUp() }
     }
 
     // ── WebSocket event collection ────────────────────────────────────────────

app/src/main/java/com/bitcointxoko/gudariwallet/ui/WalletViewModelFactory.kt

@@ -4,6 +4,7 @@ import android.app.Application
 import androidx.lifecycle.ViewModel
 import androidx.lifecycle.ViewModelProvider
 import com.bitcointxoko.gudariwallet.api.LNbitsClient
+import com.bitcointxoko.gudariwallet.api.NodeAliasClient
 import com.bitcointxoko.gudariwallet.data.BalancePrefsStore
 import com.bitcointxoko.gudariwallet.data.LNbitsNodeAliasRepository
 import com.bitcointxoko.gudariwallet.data.LNbitsWalletRepository
@@ -24,12 +25,12 @@ class WalletViewModelFactory(private val app: Application) : ViewModelProvider.F
         val secrets      = EncryptedSecretStore(app)
         val baseUrl      = secrets.baseUrl.ifBlank { "https://placeholder.invalid" }
         val api          = LNbitsClient.create(baseUrl)
-        val nodeAliasSvc = NodeAliasService(httpClient = LNbitsClient.httpClient, context = app)
+        val nodeAliasSvc = NodeAliasService(apiClient = NodeAliasClient(), context = app)
         val lnurlCache   = LnurlCacheRepository(app)
         val paymentCache = PaymentCacheRepository(app)
 
         val aliasRepo    = LNbitsNodeAliasRepository(nodeAliasSvc)
-        val repo         = LNbitsWalletRepository(api = api, secrets = secrets, context = app)
+        val repo         = LNbitsWalletRepository(api = api, secrets = secrets)
         val balancePrefs = BalancePrefsStore(app)
         val balanceVm    = BalanceViewModel(repo, balancePrefs)
         val fiatVm       = FiatViewModel(repo, balancePrefs, balanceVm)

app/src/main/java/com/bitcointxoko/gudariwallet/util/WalletConstants.kt

@@ -5,10 +5,6 @@ object WalletConstants {
     // ── Unit conversion ───────────────────────────────────────────────────────
     const val MSAT_PER_SAT = 1_000L        // millisatoshis per satoshi
 
-    // ── Polling ───────────────────────────────────────────────────────────────
-    const val POLL_INTERVAL_MS  = 3_000L   // delay between payment status checks
-    const val POLL_MAX_ATTEMPTS = 200      // 200 × 3s = 10 minutes max
-
     // ── WebSocket reconnect ───────────────────────────────────────────────────
     const val WS_INITIAL_BACKOFF_MS = 1_000L    // first retry delay
     const val WS_MAX_BACKOFF_MS     = 16_000L   // cap — never wait longer than this
@@ -33,9 +29,7 @@ object WalletConstants {
     const val PAYMENTS_PAGE_SIZE = 20
     // ── Alias cache ───────────────────────────────────────────────────────────
     const val ALIAS_CACHE_TTL_MS    = 3_600_000L    // 1 hour  — in-memory stale threshold
-    const val ALIAS_PREFS_NAME      = "alias_cache_prefs"
+    const val ALIAS_PERSIST_TTL_MS  = 21 * 24 * 60 * 60 * 1000L   // 21 days — drop on load if older than this
-    const val ALIAS_PREFS_KEY       = "alias_cache"
-    const val ALIAS_PERSIST_TTL_MS  = 86_400_000L   // 24 hours — drop on load if older than this
     // ── LNURL metadata cache ──────────────────────────────────────────────────
     const val LNURL_CACHE_TTL_MS        = 7 * 24 * 60 * 60 * 1000L   // 7 days
     // ── Payments cache ────────────────────────────────────────────────────────
@@ -48,5 +42,4 @@ object WalletConstants {
     const val BALANCE_PREFS_KEY         = "last_balance_sats"
     const val BALANCE_PREFS_SAVED_AT    = "last_balance_saved_at"
     const val BALANCE_CACHE_TTL_MS      = 3_600_000L              // 1 hour
-
 }