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* Account Activity Service for monitoring account transactions and balance changes\n *\n * This service subscribes to account activity and receives all transactions\n * and balance updates for those accounts via the comprehensive AccountActivityMessage format.\n */\n\nimport type {\n AccountsControllerGetSelectedAccountAction,\n AccountsControllerSelectedAccountChangeEvent,\n} from '@metamask/accounts-controller';\nimport type { TraceCallback } from '@metamask/controller-utils';\nimport type { InternalAccount } from '@metamask/keyring-internal-api';\nimport type { Messenger } from '@metamask/messenger';\n\nimport { projectLogger, createModuleLogger } from '../logger';\nimport type {\n Transaction,\n AccountActivityMessage,\n BalanceUpdate,\n} from '../types';\nimport type { AccountActivityServiceMethodActions } from './AccountActivityService-method-action-types';\nimport type {\n WebSocketConnectionInfo,\n BackendWebSocketServiceConnectionStateChangedEvent,\n ServerNotificationMessage,\n} from './BackendWebSocketService';\nimport { WebSocketState } from './BackendWebSocketService';\nimport type { BackendWebSocketServiceMethodActions } from './BackendWebSocketService-method-action-types';\n\n// =============================================================================\n// Types and Constants\n// =============================================================================\n\n/**\n * System notification data for chain status updates\n */\nexport type SystemNotificationData = {\n /** Array of chain IDs affected (e.g., ['eip155:137', 'eip155:1']) */\n chainIds: string[];\n /** Status of the chains: 'down' or 'up' */\n status: 'down' | 'up';\n /** Timestamp of the notification */\n timestamp?: number;\n};\n\nconst SERVICE_NAME = 'AccountActivityService';\n\nconst log = createModuleLogger(projectLogger, SERVICE_NAME);\n\nconst MESSENGER_EXPOSED_METHODS = ['subscribe', 'unsubscribe'] as const;\n\nconst SUBSCRIPTION_NAMESPACE = 'account-activity.v1';\n\n/**\n * Account subscription options\n */\nexport type SubscriptionOptions = {\n address: string; // Should be in CAIP-10 format, e.g., \"eip155:0:0x1234...\" or \"solana:0:ABC123...\"\n};\n\n/**\n * Configuration options for the account activity service\n */\nexport type AccountActivityServiceOptions = {\n /** Custom subscription namespace (default: 'account-activity.v1') */\n subscriptionNamespace?: string;\n /** Optional callback to trace performance of account activity operations (default: no-op) */\n traceFn?: TraceCallback;\n};\n\n// =============================================================================\n// Action and Event Types\n// =============================================================================\n\n// Action types for the messaging system - using generated method actions\nexport type AccountActivityServiceActions = AccountActivityServiceMethodActions;\n\n// Allowed actions that AccountActivityService can call on other controllers\nexport const ACCOUNT_ACTIVITY_SERVICE_ALLOWED_ACTIONS = [\n 'AccountsController:getSelectedAccount',\n 'BackendWebSocketService:connect',\n 'BackendWebSocketService:forceReconnection',\n 'BackendWebSocketService:subscribe',\n 'BackendWebSocketService:getConnectionInfo',\n 'BackendWebSocketService:channelHasSubscription',\n 'BackendWebSocketService:getSubscriptionsByChannel',\n 'BackendWebSocketService:findSubscriptionsByChannelPrefix',\n 'BackendWebSocketService:addChannelCallback',\n 'BackendWebSocketService:removeChannelCallback',\n] as const;\n\n// Allowed events that AccountActivityService can listen to\nexport const ACCOUNT_ACTIVITY_SERVICE_ALLOWED_EVENTS = [\n 'AccountsController:selectedAccountChange',\n 'BackendWebSocketService:connectionStateChanged',\n] as const;\n\nexport type AllowedActions =\n | AccountsControllerGetSelectedAccountAction\n | BackendWebSocketServiceMethodActions;\n\n// Event types for the messaging system\n\nexport type AccountActivityServiceTransactionUpdatedEvent = {\n type: `AccountActivityService:transactionUpdated`;\n payload: [Transaction];\n};\n\nexport type AccountActivityServiceBalanceUpdatedEvent = {\n type: `AccountActivityService:balanceUpdated`;\n payload: [{ address: string; chain: string; updates: BalanceUpdate[] }];\n};\n\nexport type AccountActivityServiceSubscriptionErrorEvent = {\n type: `AccountActivityService:subscriptionError`;\n payload: [{ addresses: string[]; error: string; operation: string }];\n};\n\nexport type AccountActivityServiceStatusChangedEvent = {\n type: `AccountActivityService:statusChanged`;\n payload: [\n {\n chainIds: string[];\n status: 'up' | 'down';\n timestamp?: number;\n },\n ];\n};\n\nexport type AccountActivityServiceEvents =\n | AccountActivityServiceTransactionUpdatedEvent\n | AccountActivityServiceBalanceUpdatedEvent\n | AccountActivityServiceSubscriptionErrorEvent\n | AccountActivityServiceStatusChangedEvent;\n\nexport type AllowedEvents =\n | AccountsControllerSelectedAccountChangeEvent\n | BackendWebSocketServiceConnectionStateChangedEvent;\n\nexport type AccountActivityServiceMessenger = Messenger<\n typeof SERVICE_NAME,\n AccountActivityServiceActions | AllowedActions,\n AccountActivityServiceEvents | AllowedEvents\n>;\n\n// =============================================================================\n// Main Service Class\n// =============================================================================\n\n/**\n * High-performance service for real-time account activity monitoring using optimized\n * WebSocket subscriptions with direct callback routing. Automatically subscribes to\n * the currently selected account and switches subscriptions when the selected account changes.\n * Receives transactions and balance updates using the comprehensive AccountActivityMessage format.\n *\n * Performance Features:\n * - Direct callback routing (no EventEmitter overhead)\n * - Minimal subscription tracking (no duplication with BackendWebSocketService)\n * - Optimized cleanup for mobile environments\n * - Single-account subscription (only selected account)\n * - Comprehensive balance updates with transfer tracking\n *\n * Architecture:\n * - Uses messenger pattern to communicate with BackendWebSocketService\n * - AccountActivityService tracks channel-to-subscriptionId mappings via messenger calls\n * - Automatically subscribes to selected account on initialization\n * - Switches subscriptions when selected account changes\n * - No direct dependency on BackendWebSocketService (uses messenger instead)\n *\n * @example\n * ```typescript\n * const service = new AccountActivityService({\n * messenger: activityMessenger,\n * });\n *\n * // Service automatically subscribes to the currently selected account\n * // When user switches accounts, service automatically resubscribes\n *\n * // All transactions and balance updates are received via optimized\n * // WebSocket callbacks and processed with zero-allocation routing\n * // Balance updates include comprehensive transfer details and post-transaction balances\n * ```\n */\nexport class AccountActivityService {\n /**\n * The name of the service.\n */\n readonly name = SERVICE_NAME;\n\n readonly #messenger: AccountActivityServiceMessenger;\n\n readonly #options: Required>;\n\n readonly #trace: TraceCallback;\n\n // Track chains that are currently up (based on system notifications)\n readonly #chainsUp: Set = new Set();\n\n // =============================================================================\n // Constructor and Initialization\n // =============================================================================\n\n /**\n * Creates a new Account Activity service instance\n *\n * @param options - Configuration options including messenger\n */\n constructor(\n options: AccountActivityServiceOptions & {\n messenger: AccountActivityServiceMessenger;\n },\n ) {\n this.#messenger = options.messenger;\n\n // Set configuration with defaults\n this.#options = {\n subscriptionNamespace:\n options.subscriptionNamespace ?? SUBSCRIPTION_NAMESPACE,\n };\n\n // Default to no-op trace function to keep core platform-agnostic\n this.#trace =\n options.traceFn ??\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n (((_request: any, fn?: any) => fn?.()) as TraceCallback);\n\n this.#messenger.registerMethodActionHandlers(\n this,\n MESSENGER_EXPOSED_METHODS,\n );\n this.#messenger.subscribe(\n 'AccountsController:selectedAccountChange',\n // Promise result intentionally not awaited\n // eslint-disable-next-line @typescript-eslint/no-misused-promises\n async (account: InternalAccount) =>\n await this.#handleSelectedAccountChange(account),\n );\n this.#messenger.subscribe(\n 'BackendWebSocketService:connectionStateChanged',\n // Promise result intentionally not awaited\n // eslint-disable-next-line @typescript-eslint/no-misused-promises\n (connectionInfo: WebSocketConnectionInfo) =>\n this.#handleWebSocketStateChange(connectionInfo),\n );\n this.#messenger.call('BackendWebSocketService:addChannelCallback', {\n channelName: `system-notifications.v1.${this.#options.subscriptionNamespace}`,\n callback: (notification: ServerNotificationMessage) =>\n this.#handleSystemNotification(notification),\n });\n }\n\n // =============================================================================\n // Account Subscription Methods\n // =============================================================================\n\n /**\n * Subscribe to account activity (transactions and balance updates)\n * Address should be in CAIP-10 format (e.g., \"eip155:0:0x1234...\" or \"solana:0:ABC123...\")\n *\n * @param subscription - Account subscription configuration with address\n */\n async subscribe(subscription: SubscriptionOptions): Promise {\n try {\n await this.#messenger.call('BackendWebSocketService:connect');\n\n // Create channel name from address\n const channel = `${this.#options.subscriptionNamespace}.${subscription.address}`;\n\n // Check if already subscribed\n if (\n this.#messenger.call(\n 'BackendWebSocketService:channelHasSubscription',\n channel,\n )\n ) {\n return;\n }\n\n // Create subscription using the proper subscribe method (this will be stored in WebSocketService's internal tracking)\n await this.#messenger.call('BackendWebSocketService:subscribe', {\n channels: [channel],\n channelType: this.#options.subscriptionNamespace, // e.g., 'account-activity.v1'\n callback: (notification: ServerNotificationMessage) => {\n this.#handleAccountActivityUpdate(\n notification.data as AccountActivityMessage,\n );\n },\n });\n } catch (error) {\n log('Subscription failed, forcing reconnection', { error });\n await this.#forceReconnection();\n }\n }\n\n /**\n * Unsubscribe from account activity for specified address\n * Address should be in CAIP-10 format (e.g., \"eip155:0:0x1234...\" or \"solana:0:ABC123...\")\n *\n * @param subscription - Account subscription configuration with address to unsubscribe\n */\n async unsubscribe(subscription: SubscriptionOptions): Promise {\n const { address } = subscription;\n try {\n // Find channel for the specified address\n const channel = `${this.#options.subscriptionNamespace}.${address}`;\n const subscriptions = this.#messenger.call(\n 'BackendWebSocketService:getSubscriptionsByChannel',\n channel,\n );\n\n if (subscriptions.length === 0) {\n return;\n }\n\n // Fast path: Direct unsubscribe using stored unsubscribe function\n // Unsubscribe from all matching subscriptions\n for (const subscriptionInfo of subscriptions) {\n await subscriptionInfo.unsubscribe();\n }\n } catch (error) {\n log('Unsubscription failed, forcing reconnection', { error });\n await this.#forceReconnection();\n }\n }\n\n // =============================================================================\n // Private Methods - Event Handlers\n // =============================================================================\n\n /**\n * Handle account activity updates (transactions + balance changes)\n * Processes the comprehensive AccountActivityMessage format with detailed balance updates and transfers\n *\n * @param payload - The account activity message containing transaction and balance updates\n * @example AccountActivityMessage format handling:\n * Input: {\n * address: \"0xd14b52362b5b777ffa754c666ddec6722aaeee08\",\n * tx: { id: \"0x1cde...\", chain: \"eip155:8453\", status: \"confirmed\", timestamp: 1760099871, ... },\n * updates: [{\n * asset: { fungible: true, type: \"eip155:8453/erc20:0x833...\", unit: \"USDC\", decimals: 6 },\n * postBalance: { amount: \"0xc350\" },\n * transfers: [{ from: \"0x7b07...\", to: \"0xd14b...\", amount: \"0x2710\" }]\n * }]\n * }\n * Output: Transaction and balance updates published separately\n */\n #handleAccountActivityUpdate(payload: AccountActivityMessage): void {\n const { address, tx, updates } = payload;\n\n // Calculate time elapsed between transaction time and message receipt\n const txTimestampMs = tx.timestamp * 1000; // Convert Unix timestamp (seconds) to milliseconds\n const elapsedMs = Date.now() - txTimestampMs;\n\n log('Handling account activity update', {\n address,\n updateCount: updates.length,\n elapsedMs,\n });\n\n // Trace message receipt with latency from transaction time to now\n // Promise result intentionally not awaited\n // eslint-disable-next-line @typescript-eslint/no-floating-promises\n this.#trace(\n {\n name: `${SERVICE_NAME} Transaction Message`,\n data: {\n chain: tx.chain,\n status: tx.status,\n elapsed_ms: elapsedMs,\n },\n tags: {\n service: SERVICE_NAME,\n notification_type: this.#options.subscriptionNamespace,\n },\n },\n () => {\n // Process transaction update\n this.#messenger.publish(\n `AccountActivityService:transactionUpdated`,\n tx,\n );\n\n // Publish comprehensive balance updates with transfer details\n this.#messenger.publish(`AccountActivityService:balanceUpdated`, {\n address,\n chain: tx.chain,\n updates,\n });\n },\n );\n }\n\n /**\n * Handle selected account change event\n *\n * @param newAccount - The newly selected account\n */\n async #handleSelectedAccountChange(\n newAccount: InternalAccount | null,\n ): Promise {\n if (!newAccount?.address) {\n return;\n }\n\n try {\n // Convert new account to CAIP-10 format\n const newAddress = this.#convertToCaip10Address(newAccount);\n\n // First, unsubscribe from all current account activity subscriptions to avoid multiple subscriptions\n await this.#unsubscribeFromAllAccountActivity();\n\n // Then, subscribe to the new selected account\n await this.subscribe({ address: newAddress });\n } catch (error) {\n log('Account change failed', { error });\n }\n }\n\n /**\n * Handle system notification for chain status changes\n * Publishes only the status change (delta) for affected chains\n *\n * @param notification - Server notification message containing chain status updates and timestamp\n */\n #handleSystemNotification(notification: ServerNotificationMessage): void {\n const data = notification.data as SystemNotificationData;\n const { timestamp } = notification;\n\n // Validate required fields\n if (!data.chainIds || !Array.isArray(data.chainIds) || !data.status) {\n throw new Error(\n 'Invalid system notification data: missing chainIds or status',\n );\n }\n\n // Track chain status\n if (data.status === 'up') {\n for (const chainId of data.chainIds) {\n this.#chainsUp.add(chainId);\n }\n } else {\n for (const chainId of data.chainIds) {\n this.#chainsUp.delete(chainId);\n }\n }\n\n // Publish status change directly (delta update)\n this.#messenger.publish(`AccountActivityService:statusChanged`, {\n chainIds: data.chainIds,\n status: data.status,\n timestamp,\n });\n\n log(\n `WebSocket status change - Published tracked chains as ${data.status}`,\n {\n count: data.chainIds.length,\n chains: data.chainIds,\n status: data.status,\n },\n );\n }\n\n /**\n * Handle WebSocket connection state changes for fallback polling and resubscription\n *\n * @param connectionInfo - WebSocket connection state information\n */\n async #handleWebSocketStateChange(\n connectionInfo: WebSocketConnectionInfo,\n ): Promise {\n const { state } = connectionInfo;\n\n if (state === WebSocketState.CONNECTED) {\n // WebSocket connected - resubscribe to selected account\n // The system notification will automatically provide the list of chains that are up\n await this.#subscribeToSelectedAccount();\n } else if (state === WebSocketState.DISCONNECTED) {\n // On disconnect, flush all tracked chains as down\n const chainsToMarkDown = Array.from(this.#chainsUp);\n\n if (chainsToMarkDown.length > 0) {\n this.#messenger.publish(`AccountActivityService:statusChanged`, {\n chainIds: chainsToMarkDown,\n status: 'down',\n timestamp: Date.now(),\n });\n\n log('WebSocket disconnection - Published tracked chains as down', {\n count: chainsToMarkDown.length,\n chains: chainsToMarkDown,\n });\n\n // Clear the tracking set since all chains are now down\n this.#chainsUp.clear();\n }\n }\n }\n\n // =============================================================================\n // Private Methods - Subscription Management\n // =============================================================================\n\n /**\n * Subscribe to the currently selected account only\n */\n async #subscribeToSelectedAccount(): Promise {\n const selectedAccount = this.#messenger.call(\n 'AccountsController:getSelectedAccount',\n );\n\n if (!selectedAccount?.address) {\n return;\n }\n\n // Convert to CAIP-10 format and subscribe\n const address = this.#convertToCaip10Address(selectedAccount);\n await this.subscribe({ address });\n }\n\n /**\n * Unsubscribe from all account activity subscriptions for this service\n * Finds all channels matching the service's namespace and unsubscribes from them\n */\n async #unsubscribeFromAllAccountActivity(): Promise {\n const accountActivitySubscriptions = this.#messenger.call(\n 'BackendWebSocketService:findSubscriptionsByChannelPrefix',\n this.#options.subscriptionNamespace,\n );\n\n // Unsubscribe from all matching subscriptions\n for (const subscription of accountActivitySubscriptions) {\n await subscription.unsubscribe();\n }\n }\n\n // =============================================================================\n // Private Methods - Utility Functions\n // =============================================================================\n\n /**\n * Convert an InternalAccount address to CAIP-10 format or raw address\n *\n * @param account - The internal account to convert\n * @returns The CAIP-10 formatted address or raw address\n */\n #convertToCaip10Address(account: InternalAccount): string {\n // Check if account has EVM scopes\n if (account.scopes.some((scope) => scope.startsWith('eip155:'))) {\n // CAIP-10 format: eip155:0:address (subscribe to all EVM chains)\n return `eip155:0:${account.address}`;\n }\n\n // Check if account has Solana scopes\n if (account.scopes.some((scope) => scope.startsWith('solana:'))) {\n // CAIP-10 format: solana:0:address (subscribe to all Solana chains)\n return `solana:0:${account.address}`;\n }\n\n // For other chains or unknown scopes, return raw address\n return account.address;\n }\n\n /**\n * Force WebSocket reconnection to clean up subscription state\n */\n async #forceReconnection(): Promise {\n log('Forcing WebSocket reconnection to clean up subscription state');\n\n // Use the dedicated forceReconnection method which performs a controlled\n // disconnect-then-connect sequence to clean up subscription state\n await this.#messenger.call('BackendWebSocketService:forceReconnection');\n }\n\n // =============================================================================\n // Public Methods - Cleanup\n // =============================================================================\n\n /**\n * Destroy the service and clean up all resources\n * Optimized for fast cleanup during service destruction or mobile app termination\n */\n destroy(): void {\n // Clean up system notification callback\n this.#messenger.call(\n 'BackendWebSocketService:removeChannelCallback',\n `system-notifications.v1.${this.#options.subscriptionNamespace}`,\n );\n }\n}\n"]}