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type {\n ControllerGetStateAction,\n ControllerStateChangeEvent,\n StateMetadata,\n} from '@metamask/base-controller';\nimport { safelyExecute } from '@metamask/controller-utils';\nimport type { Messenger } from '@metamask/messenger';\nimport type {\n NetworkControllerStateChangeEvent,\n NetworkState,\n NetworkControllerGetNetworkClientByIdAction,\n} from '@metamask/network-controller';\nimport { StaticIntervalPollingController } from '@metamask/polling-controller';\nimport type {\n StorageServiceSetItemAction,\n StorageServiceGetItemAction,\n StorageServiceGetAllKeysAction,\n} from '@metamask/storage-service';\nimport type { Hex } from '@metamask/utils';\n\nimport {\n isTokenListSupportedForNetwork,\n formatAggregatorNames,\n formatIconUrlWithProxy,\n} from './assetsUtil';\nimport { TokenRwaData, fetchTokenListByChainId } from './token-service';\n\n// 4 Hour Interval Cache Refresh Threshold\nconst DEFAULT_INTERVAL = 4 * 60 * 60 * 1000;\nconst DEFAULT_THRESHOLD = 4 * 60 * 60 * 1000;\n\nconst name = 'TokenListController';\n\nexport type TokenListToken = {\n name: string;\n symbol: string;\n decimals: number;\n address: string;\n occurrences: number;\n aggregators: string[];\n iconUrl: string;\n rwaData?: TokenRwaData;\n};\n\nexport type TokenListMap = Record;\n\nexport type DataCache = {\n timestamp: number;\n data: TokenListMap;\n};\nexport type TokensChainsCache = {\n [chainId: Hex]: DataCache;\n};\n\nexport type TokenListState = {\n tokensChainsCache: TokensChainsCache;\n};\n\nexport type TokenListStateChange = ControllerStateChangeEvent<\n typeof name,\n TokenListState\n>;\n\nexport type TokenListControllerEvents = TokenListStateChange;\n\nexport type GetTokenListState = ControllerGetStateAction<\n typeof name,\n TokenListState\n>;\n\nexport type TokenListControllerActions = GetTokenListState;\n\ntype AllowedActions =\n | NetworkControllerGetNetworkClientByIdAction\n | StorageServiceSetItemAction\n | StorageServiceGetItemAction\n | StorageServiceGetAllKeysAction;\n\ntype AllowedEvents = NetworkControllerStateChangeEvent;\n\nexport type TokenListControllerMessenger = Messenger<\n typeof name,\n TokenListControllerActions | AllowedActions,\n TokenListControllerEvents | AllowedEvents\n>;\n\nconst metadata: StateMetadata = {\n tokensChainsCache: {\n includeInStateLogs: false,\n persist: false, // Persisted separately via StorageService\n includeInDebugSnapshot: true,\n usedInUi: true,\n },\n};\n\nexport const getDefaultTokenListState = (): TokenListState => {\n return {\n tokensChainsCache: {},\n };\n};\n\n/** The input to start polling for the {@link TokenListController} */\ntype TokenListPollingInput = {\n chainId: Hex;\n};\n\n/**\n * Controller that passively polls on a set interval for the list of tokens from metaswaps api\n */\nexport class TokenListController extends StaticIntervalPollingController()<\n typeof name,\n TokenListState,\n TokenListControllerMessenger\n> {\n /**\n * Debounce timer for persisting state changes to storage.\n */\n #persistDebounceTimer?: ReturnType;\n\n /**\n * Promise for the in-flight initialization sequence.\n */\n #initializePromise?: Promise;\n\n /**\n * Promise that resolves when the current persist operation completes.\n * Used to prevent race conditions between persist operations.\n */\n #persistInFlightPromise?: Promise;\n\n /**\n * Tracks which chains have pending changes to persist.\n * Only changed chains are persisted to reduce write amplification.\n */\n readonly #changedChainsToPersist: Set = new Set();\n\n /**\n * Previous tokensChainsCache for detecting which chains changed.\n */\n #previousTokensChainsCache: TokensChainsCache = {};\n\n /**\n * Debounce delay for persisting state changes (in milliseconds).\n */\n static readonly #persistDebounceMs = 500;\n\n // Storage key prefix for per-chain files\n static readonly #storageKeyPrefix = 'tokensChainsCache';\n\n /**\n * Get storage key for a specific chain.\n *\n * @param chainId - The chain ID.\n * @returns Storage key for the chain.\n */\n static #getChainStorageKey(chainId: Hex): string {\n return `${TokenListController.#storageKeyPrefix}:${chainId}`;\n }\n\n #intervalId?: ReturnType;\n\n readonly #intervalDelay: number;\n\n readonly #cacheRefreshThreshold: number;\n\n #chainId: Hex;\n\n #abortController: AbortController;\n\n /**\n * Creates a TokenListController instance.\n *\n * @param options - The controller options.\n * @param options.chainId - The chain ID of the current network.\n * @param options.onNetworkStateChange - A function for registering an event handler for network state changes.\n * @param options.interval - The polling interval, in milliseconds.\n * @param options.cacheRefreshThreshold - The token cache expiry time, in milliseconds.\n * @param options.messenger - A restricted messenger.\n * @param options.state - Initial state to set on this controller.\n */\n constructor({\n chainId,\n onNetworkStateChange,\n interval = DEFAULT_INTERVAL,\n cacheRefreshThreshold = DEFAULT_THRESHOLD,\n messenger,\n state,\n }: {\n chainId: Hex;\n onNetworkStateChange?: (\n listener: (networkState: NetworkState) => void,\n ) => void;\n interval?: number;\n cacheRefreshThreshold?: number;\n messenger: TokenListControllerMessenger;\n state?: Partial;\n }) {\n super({\n name,\n metadata,\n messenger,\n state: { ...getDefaultTokenListState(), ...state },\n });\n\n this.#intervalDelay = interval;\n this.setIntervalLength(interval);\n this.#cacheRefreshThreshold = cacheRefreshThreshold;\n this.#chainId = chainId;\n this.#abortController = new AbortController();\n\n if (onNetworkStateChange) {\n // TODO: Either fix this lint violation or explain why it's necessary to ignore.\n // eslint-disable-next-line @typescript-eslint/no-misused-promises\n onNetworkStateChange(async (networkControllerState) => {\n await this.#onNetworkControllerStateChange(networkControllerState);\n });\n } else {\n this.messenger.subscribe(\n 'NetworkController:stateChange',\n // TODO: Either fix this lint violation or explain why it's necessary to ignore.\n // eslint-disable-next-line @typescript-eslint/no-misused-promises\n async (networkControllerState) => {\n await this.#onNetworkControllerStateChange(networkControllerState);\n },\n );\n }\n }\n\n /**\n * Initialize the controller by loading cache from storage and running migration.\n * This method should be called by clients after construction.\n *\n * @returns A promise that resolves when initialization is complete.\n */\n async initialize(): Promise {\n if (this.#initializePromise) {\n await this.#initializePromise;\n return;\n }\n\n const executeInit = async (): Promise => {\n try {\n await this.#synchronizeCacheWithStorage();\n\n // Subscribe to state changes to automatically persist tokensChainsCache\n this.messenger.subscribe(\n 'TokenListController:stateChange',\n (newCache: TokensChainsCache) => this.#onCacheChanged(newCache),\n (controllerState) => controllerState.tokensChainsCache,\n );\n } catch {\n // do nothing\n } finally {\n this.#initializePromise = undefined;\n }\n };\n\n this.#initializePromise = executeInit();\n\n await this.#initializePromise;\n }\n\n /**\n * Waits for any in-flight initialization to complete.\n * Polling should not run against partially initialized state.\n */\n async #waitForInitialization(): Promise {\n try {\n await this.#initializePromise;\n } catch {\n // do nothing\n }\n }\n\n /**\n * Handle tokensChainsCache changes by detecting which chains changed\n * and scheduling debounced persistence.\n *\n * @param newCache - The new tokensChainsCache state.\n */\n #onCacheChanged(newCache: TokensChainsCache): void {\n // Detect which chains changed by comparing with previous cache\n for (const chainId of Object.keys(newCache) as Hex[]) {\n const newData = newCache[chainId];\n const prevData = this.#previousTokensChainsCache[chainId];\n\n // Chain is new or timestamp changed (indicating data update)\n if (prevData?.timestamp !== newData.timestamp) {\n this.#changedChainsToPersist.add(chainId);\n }\n }\n\n // Update previous cache reference\n this.#previousTokensChainsCache = { ...newCache };\n\n // Schedule persistence if there are changes\n if (this.#changedChainsToPersist.size > 0) {\n this.#debouncePersist();\n }\n }\n\n /**\n * Debounce persistence of changed chains to storage.\n */\n #debouncePersist(): void {\n if (this.#persistDebounceTimer) {\n clearTimeout(this.#persistDebounceTimer);\n }\n\n this.#persistDebounceTimer = setTimeout(() => {\n // Note: #persistChangedChains handles errors internally via #saveChainCacheToStorage,\n // so this promise will not reject.\n // eslint-disable-next-line @typescript-eslint/no-floating-promises\n this.#persistChangedChains();\n }, TokenListController.#persistDebounceMs);\n }\n\n /**\n * Persist only the chains that have changed to storage.\n * Reduces write amplification by skipping unchanged chains.\n *\n * If a persist operation is already in-flight, this method returns early\n * and reschedules the debounce to ensure accumulated changes are retried\n * after the current operation completes.\n *\n * @returns A promise that resolves when changed chains are persisted.\n */\n async #persistChangedChains(): Promise {\n if (this.#persistInFlightPromise) {\n // Reschedule debounce to retry accumulated changes after in-flight persist completes\n if (this.#changedChainsToPersist.size > 0) {\n this.#debouncePersist();\n }\n return;\n }\n\n const chainsToPersist = [...this.#changedChainsToPersist];\n this.#changedChainsToPersist.clear();\n\n if (chainsToPersist.length === 0) {\n return;\n }\n\n this.#persistInFlightPromise = Promise.all(\n chainsToPersist.map((chainId) => this.#saveChainCacheToStorage(chainId)),\n ).then(() => undefined);\n\n try {\n await this.#persistInFlightPromise;\n } finally {\n this.#persistInFlightPromise = undefined;\n }\n }\n\n /**\n * Synchronize tokensChainsCache between state and storage bidirectionally.\n *\n * This method:\n * 1. Loads cached chains from storage (per-chain files) in parallel\n * 2. Merges loaded data into state (preferring existing state to avoid overwriting fresh data)\n * 3. Persists any chains that exist in state but not in storage\n *\n * Called during initialization to ensure state and storage are consistent.\n *\n * @returns A promise that resolves when synchronization is complete.\n */\n async #synchronizeCacheWithStorage(): Promise {\n try {\n const allKeys = await this.messenger.call(\n 'StorageService:getAllKeys',\n name,\n );\n\n // Filter keys that belong to tokensChainsCache (per-chain files)\n const cacheKeys = allKeys.filter((key) =>\n key.startsWith(`${TokenListController.#storageKeyPrefix}:`),\n );\n\n // Load all chains in parallel\n const chainCaches = await Promise.all(\n cacheKeys.map(async (key) => {\n // Extract chainId from key: 'tokensChainsCache:0x1' → '0x1'\n const chainId = key.split(':')[1] as Hex;\n\n const { result, error } = await this.messenger.call(\n 'StorageService:getItem',\n name,\n key,\n );\n\n if (error) {\n console.error(\n `TokenListController: Error loading cache for ${chainId}:`,\n error,\n );\n return null;\n }\n\n return result ? { chainId, data: result as DataCache } : null;\n }),\n );\n\n // Build complete cache from loaded chains\n const loadedCache: TokensChainsCache = {};\n chainCaches.forEach((chainCache) => {\n if (chainCache) {\n loadedCache[chainCache.chainId] = chainCache.data;\n }\n });\n\n // Chains in state _before loading persisted state_, from a recent update\n const chainsInState = new Set(\n Object.keys(this.state.tokensChainsCache) as Hex[],\n );\n\n // Merge loaded cache with existing state, preferring existing data\n // (which may be fresher if fetched during initialization)\n if (Object.keys(loadedCache).length > 0) {\n this.update((state) => {\n // Only load chains that don't already exist in state\n // This prevents overwriting fresh API data with stale cached data\n for (const [chainId, cacheData] of Object.entries(loadedCache)) {\n if (!state.tokensChainsCache[chainId as Hex]) {\n state.tokensChainsCache[chainId as Hex] = cacheData;\n }\n }\n });\n }\n\n // Persist chains that exist in state but were not loaded from storage.\n // This handles the case where initial state contains chains that don't exist\n // in storage yet (e.g., fresh data from API). Without this, those chains\n // would be lost on the next app restart.\n for (const chainId of chainsInState) {\n this.#changedChainsToPersist.add(chainId);\n }\n\n // Persist any chains that need to be saved\n if (this.#changedChainsToPersist.size > 0) {\n this.#debouncePersist();\n }\n\n this.#previousTokensChainsCache = { ...this.state.tokensChainsCache };\n } catch (error) {\n console.error(\n 'TokenListController: Failed to load cache from storage:',\n error,\n );\n }\n }\n\n /**\n * Save a specific chain's cache to StorageService.\n * This persists only the updated chain's data, reducing write amplification.\n *\n * @param chainId - The chain ID to save.\n * @returns A promise that resolves when saving is complete.\n */\n async #saveChainCacheToStorage(chainId: Hex): Promise {\n try {\n const chainData = this.state.tokensChainsCache[chainId];\n\n if (!chainData) {\n console.warn(`TokenListController: No cache data for chain ${chainId}`);\n return;\n }\n\n const storageKey = TokenListController.#getChainStorageKey(chainId);\n\n await this.messenger.call(\n 'StorageService:setItem',\n name,\n storageKey,\n chainData,\n );\n } catch (error) {\n console.error(\n `TokenListController: Failed to save cache for ${chainId}:`,\n error,\n );\n }\n }\n\n /**\n * Updates state and restarts polling on changes to the network controller\n * state.\n *\n * @param networkControllerState - The updated network controller state.\n */\n async #onNetworkControllerStateChange(\n networkControllerState: NetworkState,\n ): Promise {\n const selectedNetworkClient = this.messenger.call(\n 'NetworkController:getNetworkClientById',\n networkControllerState.selectedNetworkClientId,\n );\n const { chainId } = selectedNetworkClient.configuration;\n\n if (this.#chainId !== chainId) {\n this.#abortController.abort();\n this.#abortController = new AbortController();\n this.#chainId = chainId;\n }\n }\n\n // Eventually we want to remove start/restart/stop controls in favor of new _executePoll API\n // Maintaining these functions for now until we can safely deprecate them for backwards compatibility\n /**\n * Start polling for the token list.\n *\n * @deprecated This method is deprecated and will be removed in the future.\n * Consider using the new polling approach instead\n */\n async start(): Promise {\n if (!isTokenListSupportedForNetwork(this.#chainId)) {\n return;\n }\n await this.#startDeprecatedPolling();\n }\n\n /**\n * Restart polling for the token list.\n *\n * @deprecated This method is deprecated and will be removed in the future.\n * Consider using the new polling approach instead\n */\n async restart(): Promise {\n this.#stopPolling();\n await this.#startDeprecatedPolling();\n }\n\n /**\n * Stop polling for the token list.\n *\n * @deprecated This method is deprecated and will be removed in the future.\n * Consider using the new polling approach instead\n */\n stop(): void {\n this.#stopPolling();\n }\n\n /**\n * This stops any active polling.\n *\n * @deprecated This method is deprecated and will be removed in the future.\n * Consider using the new polling approach instead\n */\n override destroy(): void {\n super.destroy();\n this.#stopPolling();\n\n // Cancel any pending debounced persistence operations\n if (this.#persistDebounceTimer) {\n clearTimeout(this.#persistDebounceTimer);\n this.#persistDebounceTimer = undefined;\n }\n this.#changedChainsToPersist.clear();\n }\n\n /**\n * This stops any active polling intervals.\n *\n * @deprecated This method is deprecated and will be removed in the future.\n * Consider using the new polling approach instead\n */\n #stopPolling(): void {\n if (this.#intervalId) {\n clearInterval(this.#intervalId);\n }\n }\n\n /**\n * Starts a new polling interval for a given chainId (this should be deprecated in favor of _executePoll)\n *\n * @deprecated This method is deprecated and will be removed in the future.\n * Consider using the new polling approach instead\n */\n async #startDeprecatedPolling(): Promise {\n // renaming this to avoid collision with base class\n await safelyExecute(() => this.fetchTokenList(this.#chainId));\n // TODO: Either fix this lint violation or explain why it's necessary to ignore.\n // eslint-disable-next-line @typescript-eslint/no-misused-promises\n this.#intervalId = setInterval(async () => {\n await safelyExecute(() => this.fetchTokenList(this.#chainId));\n }, this.#intervalDelay);\n }\n\n /**\n * This starts a new polling loop for any given chain. Under the hood it is deduping polls\n *\n * @param input - The input for the poll.\n * @param input.chainId - The chainId of the chain to trigger the fetch.\n * @returns A promise that resolves when this operation completes.\n */\n async _executePoll({ chainId }: TokenListPollingInput): Promise {\n await this.#waitForInitialization();\n return this.fetchTokenList(chainId);\n }\n\n /**\n * Fetching token list from the Token Service API. This will fetch tokens across chains.\n * State changes are automatically persisted via the stateChange subscription.\n *\n * @param chainId - The chainId of the current chain triggering the fetch.\n */\n async fetchTokenList(chainId: Hex): Promise {\n if (this.isCacheValid(chainId)) {\n return;\n }\n\n // Fetch fresh token list from the API\n const tokensFromAPI = await safelyExecute(\n () =>\n fetchTokenListByChainId(\n chainId,\n this.#abortController.signal,\n ) as Promise,\n );\n\n // Have response - process and update list\n if (tokensFromAPI) {\n // Format tokens from API (HTTP) and update tokenList\n const tokenList: TokenListMap = {};\n for (const token of tokensFromAPI) {\n tokenList[token.address] = {\n ...token,\n aggregators: formatAggregatorNames(token.aggregators),\n iconUrl: formatIconUrlWithProxy({\n chainId,\n tokenAddress: token.address,\n }),\n };\n }\n\n // Update state - persistence happens automatically via subscription\n const newDataCache: DataCache = {\n data: tokenList,\n timestamp: Date.now(),\n };\n this.update((state) => {\n state.tokensChainsCache[chainId] = newDataCache;\n });\n return;\n }\n\n // No response - fallback to previous state, or initialise empty.\n // Only initialize with a new timestamp if there's no existing cache.\n // If there's existing cache, keep it as-is without updating the timestamp\n // to avoid making stale data appear \"fresh\" and preventing retry attempts.\n if (!tokensFromAPI) {\n const existingCache = this.state.tokensChainsCache[chainId];\n if (!existingCache) {\n // No existing cache - initialize empty (persistence happens automatically)\n const newDataCache: DataCache = { data: {}, timestamp: Date.now() };\n this.update((state) => {\n state.tokensChainsCache[chainId] = newDataCache;\n });\n }\n // If there's existing cache, keep it as-is (don't update timestamp or persist)\n }\n }\n\n isCacheValid(chainId: Hex): boolean {\n const { tokensChainsCache }: TokenListState = this.state;\n const timestamp: number | undefined = tokensChainsCache[chainId]?.timestamp;\n const now = Date.now();\n return (\n timestamp !== undefined && now - timestamp < this.#cacheRefreshThreshold\n );\n }\n}\n\nexport default TokenListController;\n"]}