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type {\n AccountsControllerListMultichainAccountsAction,\n AccountsControllerAccountAddedEvent,\n AccountsControllerGetSelectedMultichainAccountAction,\n} from '@metamask/accounts-controller';\nimport type {\n ControllerStateChangeEvent,\n ControllerGetStateAction,\n StateMetadata,\n} from '@metamask/base-controller';\nimport { isEvmAccountType } from '@metamask/keyring-api';\nimport type { CaipAssetType } from '@metamask/keyring-api';\nimport type {\n KeyringControllerLockEvent,\n KeyringControllerUnlockEvent,\n} from '@metamask/keyring-controller';\nimport type { InternalAccount } from '@metamask/keyring-internal-api';\nimport type { Messenger } from '@metamask/messenger';\nimport { StaticIntervalPollingController } from '@metamask/polling-controller';\nimport type { SnapControllerHandleRequestAction } from '@metamask/snaps-controllers';\nimport type {\n SnapId,\n AssetConversion,\n OnAssetsConversionArguments,\n OnAssetHistoricalPriceArguments,\n OnAssetHistoricalPriceResponse,\n HistoricalPriceIntervals,\n OnAssetsMarketDataArguments,\n OnAssetsMarketDataResponse,\n FungibleAssetMarketData,\n OnAssetsConversionResponse,\n} from '@metamask/snaps-sdk';\nimport { HandlerType } from '@metamask/snaps-utils';\nimport { Mutex } from 'async-mutex';\nimport type { Draft } from 'immer';\n\nimport type {\n CurrencyRateState,\n CurrencyRateStateChange,\n GetCurrencyRateState,\n} from '../CurrencyRateController';\nimport type {\n MultichainAssetsControllerGetStateAction,\n MultichainAssetsControllerAccountAssetListUpdatedEvent,\n} from '../MultichainAssetsController';\nimport { MAP_CAIP_CURRENCIES } from './constant';\nimport type { MultichainAssetsRatesControllerMethodActions } from './MultichainAssetsRatesController-method-action-types';\n\n/**\n * The name of the MultichainAssetsRatesController.\n */\nconst controllerName = 'MultichainAssetsRatesController';\n\n// This is temporary until its exported from snap\ntype HistoricalPrice = {\n intervals: HistoricalPriceIntervals;\n // The UNIX timestamp of when the historical price was last updated.\n updateTime: number;\n // The UNIX timestamp of when the historical price will expire.\n expirationTime?: number;\n};\n\n/**\n * State used by the MultichainAssetsRatesController to cache token conversion rates.\n */\nexport type MultichainAssetsRatesControllerState = {\n conversionRates: Record;\n historicalPrices: Record>; // string being the current currency we fetched historical prices for\n};\n\n/**\n * Returns the state of the MultichainAssetsRatesController.\n */\nexport type MultichainAssetsRatesControllerGetStateAction =\n ControllerGetStateAction<\n typeof controllerName,\n MultichainAssetsRatesControllerState\n >;\n\ntype UnifiedAssetConversion = AssetConversion & {\n marketData?: FungibleAssetMarketData;\n};\n\n/**\n * Constructs the default {@link MultichainAssetsRatesController} state. This allows\n * consumers to provide a partial state object when initializing the controller\n * and also helps in constructing complete state objects for this controller in\n * tests.\n *\n * @returns The default {@link MultichainAssetsRatesController} state.\n */\nexport function getDefaultMultichainAssetsRatesControllerState(): MultichainAssetsRatesControllerState {\n return { conversionRates: {}, historicalPrices: {} };\n}\n\n/**\n * Event emitted when the state of the MultichainAssetsRatesController changes.\n */\nexport type MultichainAssetsRatesControllerStateChange =\n ControllerStateChangeEvent<\n typeof controllerName,\n MultichainAssetsRatesControllerState\n >;\n\n/**\n * Actions exposed by the MultichainAssetsRatesController.\n */\nexport type MultichainAssetsRatesControllerActions =\n | MultichainAssetsRatesControllerGetStateAction\n | MultichainAssetsRatesControllerMethodActions;\n\n/**\n * Events emitted by MultichainAssetsRatesController.\n */\nexport type MultichainAssetsRatesControllerEvents =\n MultichainAssetsRatesControllerStateChange;\n\n/**\n * Actions that this controller is allowed to call.\n */\nexport type AllowedActions =\n | SnapControllerHandleRequestAction\n | AccountsControllerListMultichainAccountsAction\n | GetCurrencyRateState\n | MultichainAssetsControllerGetStateAction\n | AccountsControllerGetSelectedMultichainAccountAction;\n\n/**\n * Events that this controller is allowed to subscribe to.\n */\nexport type AllowedEvents =\n | KeyringControllerLockEvent\n | KeyringControllerUnlockEvent\n | AccountsControllerAccountAddedEvent\n | CurrencyRateStateChange\n | MultichainAssetsControllerAccountAssetListUpdatedEvent;\n/**\n * Messenger type for the MultichainAssetsRatesController.\n */\nexport type MultichainAssetsRatesControllerMessenger = Messenger<\n typeof controllerName,\n MultichainAssetsRatesControllerActions | AllowedActions,\n MultichainAssetsRatesControllerEvents | AllowedEvents\n>;\n\n/**\n * The input for starting polling in MultichainAssetsRatesController.\n */\nexport type MultichainAssetsRatesPollingInput = {\n accountId: string;\n};\n\nconst metadata: StateMetadata = {\n conversionRates: {\n includeInStateLogs: false,\n persist: true,\n includeInDebugSnapshot: true,\n usedInUi: true,\n },\n historicalPrices: {\n includeInStateLogs: false,\n persist: false,\n includeInDebugSnapshot: true,\n usedInUi: true,\n },\n};\n\nexport type ConversionRatesWithMarketData = {\n conversionRates: Record<\n CaipAssetType,\n Record\n >;\n};\n\n/**\n * Arguments for a Snap request.\n */\ntype SnapRequestArgs = {\n snapId: SnapId;\n handler: HandlerType;\n params: T;\n};\n\nconst MESSENGER_EXPOSED_METHODS = [\n 'updateAssetsRates',\n 'fetchHistoricalPricesForAsset',\n] as const;\n\n/**\n * Controller that manages multichain token conversion rates.\n *\n * This controller polls for token conversion rates and updates its state.\n */\nexport class MultichainAssetsRatesController extends StaticIntervalPollingController()<\n typeof controllerName,\n MultichainAssetsRatesControllerState,\n MultichainAssetsRatesControllerMessenger\n> {\n readonly #mutex = new Mutex();\n\n #currentCurrency: CurrencyRateState['currentCurrency'];\n\n #isUnlocked = true;\n\n /**\n * Creates an instance of MultichainAssetsRatesController.\n *\n * @param options - Constructor options.\n * @param options.interval - The polling interval in milliseconds.\n * @param options.state - The initial state.\n * @param options.messenger - A reference to the messenger.\n */\n constructor({\n interval = 18000,\n state = {},\n messenger,\n }: {\n interval?: number;\n state?: Partial;\n messenger: MultichainAssetsRatesControllerMessenger;\n }) {\n super({\n name: controllerName,\n messenger,\n state: {\n ...getDefaultMultichainAssetsRatesControllerState(),\n ...state,\n },\n metadata,\n });\n\n this.setIntervalLength(interval);\n\n messenger.registerMethodActionHandlers(this, MESSENGER_EXPOSED_METHODS);\n\n // Subscribe to keyring lock/unlock events.\n this.messenger.subscribe('KeyringController:lock', () => {\n this.#isUnlocked = false;\n });\n this.messenger.subscribe('KeyringController:unlock', () => {\n this.#isUnlocked = true;\n });\n\n ({ currentCurrency: this.#currentCurrency } = this.messenger.call(\n 'CurrencyRateController:getState',\n ));\n\n this.messenger.subscribe(\n 'CurrencyRateController:stateChange',\n // eslint-disable-next-line @typescript-eslint/no-misused-promises\n async (currentCurrency: string) => {\n this.#currentCurrency = currentCurrency;\n await this.updateAssetsRates();\n },\n (currencyRateControllerState) =>\n currencyRateControllerState.currentCurrency,\n );\n\n this.messenger.subscribe(\n 'MultichainAssetsController:accountAssetListUpdated',\n // eslint-disable-next-line @typescript-eslint/no-misused-promises\n async ({ assets }) => {\n const newAccountAssets = Object.entries(assets).map(\n ([accountId, { added }]) => ({\n accountId,\n assets: [...added],\n }),\n );\n // TODO; removed can be used in future for further cleanup\n await this.#updateAssetsRatesForNewAssets(newAccountAssets);\n },\n );\n }\n\n /**\n * Executes a poll by updating token conversion rates for the current account.\n *\n * @returns A promise that resolves when the polling completes.\n */\n async _executePoll(): Promise {\n await this.updateAssetsRates();\n }\n\n /**\n * Determines whether the controller is active.\n *\n * @returns True if the keyring is unlocked; otherwise, false.\n */\n get isActive(): boolean {\n return this.#isUnlocked;\n }\n\n /**\n * Checks if an account is a non-EVM account with a Snap.\n *\n * @param account - The account to check.\n * @returns True if the account is non-EVM and has Snap metadata; otherwise, false.\n */\n #isNonEvmAccount(account: InternalAccount): boolean {\n return (\n !isEvmAccountType(account.type) && account.metadata.snap !== undefined\n );\n }\n\n /**\n * Retrieves all multichain accounts from the AccountsController.\n *\n * @returns An array of internal accounts.\n */\n #listMultichainAccounts(): InternalAccount[] {\n return this.messenger.call('AccountsController:listMultichainAccounts');\n }\n\n /**\n * Filters and returns non-EVM accounts that should have balances.\n *\n * @returns An array of non-EVM internal accounts.\n */\n #listAccounts(): InternalAccount[] {\n const accounts = this.#listMultichainAccounts();\n return accounts.filter((account) => this.#isNonEvmAccount(account));\n }\n\n /**\n * Adds the assets to a map of Snap ID to assets.\n *\n * @param snapIdToAssets - The map of Snap ID to assets.\n * @param account - The account to add the assets for.\n * @param assets - The assets to add.\n */\n #addAssetsToSnapIdMap(\n snapIdToAssets: Map>,\n account: InternalAccount,\n assets: CaipAssetType[],\n ): void {\n // Prevent creating a new set if there are no assets to add.\n if (assets.length === 0) {\n return;\n }\n\n // FIXME: Instead of using the Snap ID from the account, we should\n // select the Snap based on the supported scopes defined in the Snaps'\n // manifest.\n const snapId = account.metadata.snap?.id as SnapId | undefined;\n if (!snapId) {\n return;\n }\n\n let snapAssets = snapIdToAssets.get(snapId);\n if (!snapAssets) {\n snapAssets = new Set();\n snapIdToAssets.set(snapId, snapAssets);\n }\n\n for (const asset of assets) {\n snapAssets.add(asset);\n }\n }\n\n /**\n * Updates token conversion rates for each non-EVM account.\n *\n * @returns A promise that resolves when the rates are updated.\n */\n async updateAssetsRates(): Promise {\n const releaseLock = await this.#mutex.acquire();\n\n return (async (): Promise => {\n if (!this.isActive) {\n return;\n }\n\n // Compute the set of unique assets from all accounts. It's important to\n // deduplicate assets here to avoid duplicate requests to the Snap.\n const accounts = this.#listAccounts();\n const snapIdToAssets = new Map>();\n for (const account of accounts) {\n this.#addAssetsToSnapIdMap(\n snapIdToAssets,\n account,\n this.#getAssetsForAccount(account.id),\n );\n }\n\n this.#applyUpdatedRates(await this.#getUpdatedRatesFor(snapIdToAssets));\n })().finally(() => {\n releaseLock();\n });\n }\n\n /**\n * Returns the CAIP-19 asset type for the current selected currency. Defaults\n * to USD if the current selected currency is not supported.\n *\n * @returns The CAIP-19 asset type for the current selected currency.\n */\n #getCaipCurrentCurrency(): CaipAssetType {\n return (\n MAP_CAIP_CURRENCIES[this.#currentCurrency] ?? MAP_CAIP_CURRENCIES.usd\n );\n }\n\n /**\n * Fetches the conversion rates for the given assets from the given Snap.\n *\n * @param snapId - The ID of the Snap.\n * @param assets - The assets to fetch the conversion rates for.\n * @param currency - The currency to fetch the conversion rates for.\n * @returns A record of CAIP-19 asset types to conversion rates.\n */\n async #getConversionRates(\n snapId: SnapId,\n assets: Set,\n currency: CaipAssetType,\n ): Promise> {\n // Prevent making a Snap call if there are no assets to fetch.\n if (assets.size === 0) {\n return {};\n }\n\n const response = await this.#handleSnapRequest({\n snapId,\n handler: HandlerType.OnAssetsConversion,\n params: {\n conversions: Array.from(assets).map((asset) => ({\n from: asset,\n to: currency,\n })),\n },\n });\n\n if (!response) {\n return {};\n }\n\n const assetToConversionRate: Record<\n CaipAssetType,\n AssetConversion | undefined\n > = {};\n\n for (const asset of assets) {\n assetToConversionRate[asset] =\n response.conversionRates?.[asset]?.[currency] ?? undefined;\n }\n\n return assetToConversionRate;\n }\n\n /**\n * Fetches the market data for the given assets from the given Snap.\n *\n * @param snapId - The ID of the Snap.\n * @param assets - The assets to fetch the market data for.\n * @param currency - The currency to fetch the market data for.\n * @returns A record of CAIP-19 asset types to market data.\n */\n async #getMarketData(\n snapId: SnapId,\n assets: Set,\n currency: CaipAssetType,\n ): Promise> {\n // Prevent making a Snap call if there are no assets to fetch.\n if (assets.size === 0) {\n return {};\n }\n\n const response = await this.#handleSnapRequest({\n snapId,\n handler: HandlerType.OnAssetsMarketData,\n params: {\n assets: Array.from(assets).map((asset) => ({\n asset,\n unit: currency,\n })),\n },\n });\n\n if (!response) {\n return {};\n }\n\n const assetToMarketData: Record<\n CaipAssetType,\n FungibleAssetMarketData | undefined\n > = {};\n\n for (const asset of assets) {\n const assetMarketData = response.marketData?.[asset]?.[currency];\n\n // We do not consider NFTs here, so `fungible` must be `true`.\n if (assetMarketData?.fungible) {\n assetToMarketData[asset] = assetMarketData;\n } else {\n assetToMarketData[asset] = undefined;\n }\n }\n\n return assetToMarketData;\n }\n\n /**\n * Fetches the updated rates for the given assets from the given Snaps.\n *\n * @param snapIdToAssets - A map of Snap ID to CAIP-19 asset types.\n * @returns A record of CAIP-19 asset types to unified asset conversions.\n */\n async #getUpdatedRatesFor(\n snapIdToAssets: Map>,\n ): Promise<\n Record\n > {\n const updatedRates: Record<\n CaipAssetType,\n UnifiedAssetConversion & { currency: CaipAssetType }\n > = {};\n\n // Keep a local copy to ensure that the currency is always the same for the\n // entire loop.\n const currency = this.#getCaipCurrentCurrency();\n\n // Note: Since the assets come from a 1-to-1 mapping with Snap IDs, we know\n // that a given asset will not appear under multiple Snap IDs.\n for (const [snapId, assets] of snapIdToAssets.entries()) {\n const [rates, marketData] = await Promise.all([\n this.#getConversionRates(snapId, assets, currency),\n this.#getMarketData(snapId, assets, currency),\n ]);\n\n for (const asset of assets) {\n const assetRate = rates[asset];\n const assetMarketData = marketData[asset];\n\n // Rates are mandatory, so skip the asset if not available.\n if (!assetRate) {\n continue;\n }\n\n updatedRates[asset] = {\n currency,\n ...assetRate,\n ...(assetMarketData && { marketData: assetMarketData }),\n };\n }\n }\n\n return updatedRates;\n }\n\n /**\n * Fetches historical prices for the current account\n *\n * @param asset - The asset to fetch historical prices for.\n * @param account - optional account to fetch historical prices for\n * @returns The historical prices.\n */\n async fetchHistoricalPricesForAsset(\n asset: CaipAssetType,\n account?: InternalAccount,\n ): Promise {\n const releaseLock = await this.#mutex.acquire();\n return (async () => {\n const currentCaipCurrency =\n MAP_CAIP_CURRENCIES[this.#currentCurrency] ?? MAP_CAIP_CURRENCIES.usd;\n // Check if we already have historical prices for this asset and currency\n const historicalPriceExpirationTime =\n this.state.historicalPrices[asset]?.[this.#currentCurrency]\n ?.expirationTime;\n\n const historicalPriceHasExpired =\n historicalPriceExpirationTime &&\n historicalPriceExpirationTime < Date.now();\n\n if (historicalPriceHasExpired === false) {\n return;\n }\n\n const selectedAccount =\n account ??\n this.messenger.call('AccountsController:getSelectedMultichainAccount');\n try {\n const historicalPricesResponse = await this.messenger.call(\n 'SnapController:handleRequest',\n {\n snapId: selectedAccount?.metadata.snap?.id as SnapId,\n origin: 'metamask',\n handler: HandlerType.OnAssetHistoricalPrice,\n request: {\n jsonrpc: '2.0',\n method: HandlerType.OnAssetHistoricalPrice,\n params: {\n from: asset,\n to: currentCaipCurrency,\n },\n },\n },\n );\n\n // skip state update if no historical prices are returned\n if (!historicalPricesResponse) {\n return;\n }\n\n this.update((state) => {\n state.historicalPrices = {\n ...state.historicalPrices,\n [asset]: {\n ...state.historicalPrices[asset],\n [this.#currentCurrency]: (\n historicalPricesResponse as OnAssetHistoricalPriceResponse\n )?.historicalPrice,\n },\n };\n });\n } catch {\n throw new Error(\n `Failed to fetch historical prices for asset: ${asset}`,\n );\n }\n })().finally(() => {\n releaseLock();\n });\n }\n\n /**\n * Updates the conversion rates for new assets.\n *\n * @param accounts - The accounts to update the conversion rates for.\n * @returns A promise that resolves when the rates are updated.\n */\n async #updateAssetsRatesForNewAssets(\n accounts: {\n accountId: string;\n assets: CaipAssetType[];\n }[],\n ): Promise {\n const releaseLock = await this.#mutex.acquire();\n\n return (async () => {\n if (!this.isActive) {\n return;\n }\n\n // First build a map containing all assets that need to be updated per\n // Snap ID, this will be used to batch the requests.\n const snapIdToAssets = new Map>();\n\n for (const { accountId, assets } of accounts) {\n this.#addAssetsToSnapIdMap(\n snapIdToAssets,\n this.#getAccount(accountId),\n assets,\n );\n }\n\n this.#applyUpdatedRates(await this.#getUpdatedRatesFor(snapIdToAssets));\n })().finally(() => {\n releaseLock();\n });\n }\n\n /**\n * Get a non-EVM account from its ID.\n *\n * @param accountId - The account ID.\n * @returns The non-EVM account.\n */\n #getAccount(accountId: string): InternalAccount {\n const account: InternalAccount | undefined = this.#listAccounts().find(\n (multichainAccount) => multichainAccount.id === accountId,\n );\n\n if (!account) {\n throw new Error(`Unknown account: ${accountId}`);\n }\n\n return account;\n }\n\n /**\n * Returns the array of CAIP-19 assets for the given account ID.\n * If none are found, returns an empty array.\n *\n * @param accountId - The account ID to get the assets for.\n * @returns An array of CAIP-19 assets.\n */\n #getAssetsForAccount(accountId: string): CaipAssetType[] {\n // Always fetch fresh state - MultichainAssetsController uses Immer which creates\n // new object references on every update, so caching would become stale.\n const { accountsAssets } = this.messenger.call(\n 'MultichainAssetsController:getState',\n );\n return accountsAssets?.[accountId] ?? [];\n }\n\n /**\n * Merges the new rates into the controller's state.\n *\n * @param updatedRates - The new rates to merge.\n */\n #applyUpdatedRates(\n updatedRates: Record<\n CaipAssetType,\n UnifiedAssetConversion & { currency: CaipAssetType }\n >,\n ): void {\n if (Object.keys(updatedRates).length === 0) {\n return;\n }\n this.update((state: Draft) => {\n state.conversionRates = {\n ...state.conversionRates,\n ...updatedRates,\n };\n });\n }\n\n /**\n * Forwards a Snap request to the SnapController.\n *\n * @param args - The request parameters.\n * @param args.snapId - The ID of the Snap.\n * @param args.handler - The handler type.\n * @param args.params - The asset conversions.\n * @returns A promise that resolves with the account rates.\n */\n async #handleSnapRequest(\n args: SnapRequestArgs,\n ): Promise;\n\n async #handleSnapRequest(\n args: SnapRequestArgs,\n ): Promise;\n\n async #handleSnapRequest(\n args: SnapRequestArgs,\n ): Promise;\n\n async #handleSnapRequest(args: SnapRequestArgs): Promise {\n const { snapId, handler, params } = args;\n try {\n return await this.messenger.call('SnapController:handleRequest', {\n snapId,\n origin: 'metamask',\n handler,\n request: {\n jsonrpc: '2.0',\n method: handler,\n params,\n },\n });\n } catch (error) {\n console.error(`Snap request failed for ${handler}:`, {\n snapId,\n handler,\n message: (error as Error).message,\n params,\n });\n return undefined;\n }\n }\n}\n"]}