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type {\n AccountsControllerAccountAddedEvent,\n AccountsControllerAccountAssetListUpdatedEvent,\n AccountsControllerAccountRemovedEvent,\n AccountsControllerListMultichainAccountsAction,\n} from '@metamask/accounts-controller';\nimport { BaseController } from '@metamask/base-controller';\nimport type {\n ControllerGetStateAction,\n ControllerStateChangeEvent,\n StateMetadata,\n} from '@metamask/base-controller';\nimport { isEvmAccountType } from '@metamask/keyring-api';\nimport type {\n AccountAssetListUpdatedEventPayload,\n CaipAssetType,\n CaipAssetTypeOrId,\n} from '@metamask/keyring-api';\nimport type { InternalAccount } from '@metamask/keyring-internal-api';\nimport { KeyringClient } from '@metamask/keyring-snap-client';\nimport type { Messenger } from '@metamask/messenger';\nimport type {\n GetPermissions,\n PermissionConstraint,\n SubjectPermissions,\n} from '@metamask/permission-controller';\nimport type {\n BulkTokenScanResponse,\n PhishingControllerBulkScanTokensAction,\n} from '@metamask/phishing-controller';\nimport { TokenScanResultType } from '@metamask/phishing-controller';\nimport type {\n SnapControllerGetRunnableSnapsAction,\n SnapControllerHandleRequestAction,\n} from '@metamask/snaps-controllers';\nimport type { FungibleAssetMetadata, Snap, SnapId } from '@metamask/snaps-sdk';\nimport { HandlerType } from '@metamask/snaps-utils';\nimport { isCaipAssetType, parseCaipAssetType } from '@metamask/utils';\nimport type { CaipChainId } from '@metamask/utils';\nimport type { Json, JsonRpcRequest } from '@metamask/utils';\nimport type { MutexInterface } from 'async-mutex';\nimport { Mutex } from 'async-mutex';\n\nimport type { MultichainAssetsControllerMethodActions } from './MultichainAssetsController-method-action-types';\nimport { getChainIdsCaveat } from './utils';\n\nconst controllerName = 'MultichainAssetsController';\n\nexport type MultichainAssetsControllerState = {\n assetsMetadata: {\n [asset: CaipAssetType]: FungibleAssetMetadata;\n };\n accountsAssets: { [account: string]: CaipAssetType[] };\n allIgnoredAssets: { [account: string]: CaipAssetType[] };\n};\n\n// Represents the response of the asset snap's onAssetLookup handler\nexport type AssetMetadataResponse = {\n assets: {\n [asset: CaipAssetType]: FungibleAssetMetadata;\n };\n};\n\nexport type MultichainAssetsControllerAccountAssetListUpdatedEvent = {\n type: `${typeof controllerName}:accountAssetListUpdated`;\n payload: AccountsControllerAccountAssetListUpdatedEvent['payload'];\n};\n\n/**\n * Constructs the default {@link MultichainAssetsController} 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 MultichainAssetsController} state.\n */\nexport function getDefaultMultichainAssetsControllerState(): MultichainAssetsControllerState {\n return { accountsAssets: {}, assetsMetadata: {}, allIgnoredAssets: {} };\n}\n\n/**\n * Returns the state of the {@link MultichainAssetsController}.\n */\nexport type MultichainAssetsControllerGetStateAction = ControllerGetStateAction<\n typeof controllerName,\n MultichainAssetsControllerState\n>;\n\n/**\n * Event emitted when the state of the {@link MultichainAssetsController} changes.\n */\nexport type MultichainAssetsControllerStateChangeEvent =\n ControllerStateChangeEvent<\n typeof controllerName,\n MultichainAssetsControllerState\n >;\n\n/**\n * Actions exposed by the {@link MultichainAssetsController}.\n */\nexport type MultichainAssetsControllerActions =\n | MultichainAssetsControllerGetStateAction\n | MultichainAssetsControllerMethodActions;\n\n/**\n * Events emitted by {@link MultichainAssetsController}.\n */\nexport type MultichainAssetsControllerEvents =\n | MultichainAssetsControllerStateChangeEvent\n | MultichainAssetsControllerAccountAssetListUpdatedEvent;\n\n/**\n * A function executed within a mutually exclusive lock, with\n * a mutex releaser in its option bag.\n *\n * @param releaseLock - A function to release the lock.\n */\ntype MutuallyExclusiveCallback = ({\n releaseLock,\n}: {\n releaseLock: MutexInterface.Releaser;\n}) => Promise;\n\n/**\n * Actions that this controller is allowed to call.\n */\ntype AllowedActions =\n | SnapControllerGetRunnableSnapsAction\n | SnapControllerHandleRequestAction\n | GetPermissions\n | AccountsControllerListMultichainAccountsAction\n | PhishingControllerBulkScanTokensAction;\n\n/**\n * Events that this controller is allowed to subscribe.\n */\ntype AllowedEvents =\n | AccountsControllerAccountAddedEvent\n | AccountsControllerAccountRemovedEvent\n | AccountsControllerAccountAssetListUpdatedEvent;\n\n/**\n * Messenger type for the MultichainAssetsController.\n */\nexport type MultichainAssetsControllerMessenger = Messenger<\n typeof controllerName,\n MultichainAssetsControllerActions | AllowedActions,\n MultichainAssetsControllerEvents | AllowedEvents\n>;\n\n/**\n * {@link MultichainAssetsController}'s metadata.\n *\n * This allows us to choose if fields of the state should be persisted or not\n * using the `persist` flag; and if they can be sent to Sentry or not, using\n * the `anonymous` flag.\n */\nconst assetsControllerMetadata: StateMetadata =\n {\n assetsMetadata: {\n includeInStateLogs: false,\n persist: true,\n includeInDebugSnapshot: false,\n usedInUi: true,\n },\n accountsAssets: {\n includeInStateLogs: false,\n persist: true,\n includeInDebugSnapshot: false,\n usedInUi: true,\n },\n allIgnoredAssets: {\n includeInStateLogs: false,\n persist: true,\n includeInDebugSnapshot: false,\n usedInUi: true,\n },\n };\n\nconst MESSENGER_EXPOSED_METHODS = [\n 'getAssetMetadata',\n 'ignoreAssets',\n 'addAssets',\n] as const;\n\n// TODO: make this controller extends StaticIntervalPollingController and update all assetsMetadata once a day.\n\nexport class MultichainAssetsController extends BaseController<\n typeof controllerName,\n MultichainAssetsControllerState,\n MultichainAssetsControllerMessenger\n> {\n // Mapping of CAIP-2 Chain ID to Asset Snaps.\n #snaps: Record;\n\n readonly #controllerOperationMutex = new Mutex();\n\n constructor({\n messenger,\n state = {},\n }: {\n messenger: MultichainAssetsControllerMessenger;\n state?: Partial;\n }) {\n super({\n messenger,\n name: controllerName,\n metadata: assetsControllerMetadata,\n state: {\n ...getDefaultMultichainAssetsControllerState(),\n ...state,\n },\n });\n\n this.#snaps = {};\n\n this.messenger.subscribe(\n 'AccountsController:accountAdded',\n async (account) => await this.#handleOnAccountAddedEvent(account),\n );\n this.messenger.subscribe(\n 'AccountsController:accountRemoved',\n async (account) => await this.#handleOnAccountRemovedEvent(account),\n );\n this.messenger.subscribe(\n 'AccountsController:accountAssetListUpdated',\n async (event) => await this.#handleAccountAssetListUpdatedEvent(event),\n );\n\n messenger.registerMethodActionHandlers(this, MESSENGER_EXPOSED_METHODS);\n }\n\n async #handleAccountAssetListUpdatedEvent(\n event: AccountAssetListUpdatedEventPayload,\n ) {\n return this.#withControllerLock(async () =>\n this.#handleAccountAssetListUpdated(event),\n );\n }\n\n async #handleOnAccountAddedEvent(account: InternalAccount) {\n return this.#withControllerLock(async () =>\n this.#handleOnAccountAdded(account),\n );\n }\n\n /**\n * Returns the metadata for the given asset\n *\n * @param asset - The asset to get metadata for\n * @returns The metadata for the asset or undefined if not found.\n */\n getAssetMetadata(asset: CaipAssetType): FungibleAssetMetadata | undefined {\n return this.state.assetsMetadata[asset];\n }\n\n /**\n * Ignores a batch of assets for a specific account.\n *\n * @param assetsToIgnore - Array of asset IDs to ignore.\n * @param accountId - The account ID to ignore assets for.\n */\n ignoreAssets(assetsToIgnore: CaipAssetType[], accountId: string): void {\n this.update((state) => {\n if (state.accountsAssets[accountId]) {\n state.accountsAssets[accountId] = state.accountsAssets[\n accountId\n ].filter((asset) => !assetsToIgnore.includes(asset));\n }\n\n if (!state.allIgnoredAssets[accountId]) {\n state.allIgnoredAssets[accountId] = [];\n }\n\n const newIgnoredAssets = assetsToIgnore.filter(\n (asset) => !state.allIgnoredAssets[accountId].includes(asset),\n );\n state.allIgnoredAssets[accountId].push(...newIgnoredAssets);\n });\n }\n\n /**\n * Adds multiple assets to the stored asset list for a specific account.\n * All assets must belong to the same chain.\n *\n * @param assetIds - Array of CAIP asset IDs to add (must be from same chain).\n * @param accountId - The account ID to add the assets to.\n * @returns The updated asset list for the account.\n * @throws Error if assets are from different chains.\n */\n async addAssets(\n assetIds: CaipAssetType[],\n accountId: string,\n ): Promise {\n if (assetIds.length === 0) {\n return this.state.accountsAssets[accountId] || [];\n }\n\n // Validate that all assets are from the same chain\n const chainIds = new Set(\n assetIds.map((assetId) => parseCaipAssetType(assetId).chainId),\n );\n if (chainIds.size > 1) {\n throw new Error(\n `All assets must belong to the same chain. Found assets from chains: ${Array.from(chainIds).join(', ')}`,\n );\n }\n\n return this.#withControllerLock(async () => {\n // Refresh metadata for all assets\n await this.#refreshAssetsMetadata(assetIds);\n\n const addedAssets: CaipAssetType[] = [];\n\n this.update((state) => {\n // Initialize account assets if it doesn't exist\n if (!state.accountsAssets[accountId]) {\n state.accountsAssets[accountId] = [];\n }\n\n // Add assets if they don't already exist\n for (const assetId of assetIds) {\n if (!state.accountsAssets[accountId].includes(assetId)) {\n state.accountsAssets[accountId].push(assetId);\n addedAssets.push(assetId);\n }\n }\n\n // Remove from ignored list if they exist there (inline logic like EVM)\n if (state.allIgnoredAssets[accountId]) {\n state.allIgnoredAssets[accountId] = state.allIgnoredAssets[\n accountId\n ].filter((asset) => !assetIds.includes(asset));\n\n // Clean up empty arrays\n if (state.allIgnoredAssets[accountId].length === 0) {\n delete state.allIgnoredAssets[accountId];\n }\n }\n });\n\n // Publish event to notify other controllers (balances, rates) about the new assets\n if (addedAssets.length > 0) {\n this.messenger.publish(`${controllerName}:accountAssetListUpdated`, {\n assets: {\n [accountId]: {\n added: addedAssets,\n removed: [],\n },\n },\n });\n }\n\n return this.state.accountsAssets[accountId] || [];\n });\n }\n\n /**\n * Checks if an asset is ignored for a specific account.\n *\n * @param asset - The asset ID to check.\n * @param accountId - The account ID to check for.\n * @returns True if the asset is ignored, false otherwise.\n */\n #isAssetIgnored(asset: CaipAssetType, accountId: string): boolean {\n return this.state.allIgnoredAssets[accountId]?.includes(asset) ?? false;\n }\n\n /**\n * Function to update the assets list for an account\n *\n * @param event - The list of assets to update\n */\n async #handleAccountAssetListUpdated(\n event: AccountAssetListUpdatedEventPayload,\n ) {\n this.#assertControllerMutexIsLocked();\n\n const assetsForMetadataRefresh = new Set([]);\n const accountsAndAssetsToUpdate: AccountAssetListUpdatedEventPayload['assets'] =\n {};\n for (const [accountId, { added, removed }] of Object.entries(\n event.assets,\n )) {\n if (added.length > 0 || removed.length > 0) {\n const existing = this.state.accountsAssets[accountId] || [];\n\n // In case accountsAndAssetsToUpdate event is fired with \"added\" assets that already exist, we don't want to add them again\n // Also filter out ignored assets\n const preFilteredToBeAddedAssets = added.filter(\n (asset) =>\n !existing.includes(asset) &&\n isCaipAssetType(asset) &&\n !this.#isAssetIgnored(asset, accountId),\n );\n\n // Filter out tokens flagged by Blockaid as non-benign\n const filteredToBeAddedAssets = await this.#filterBlockaidSpamTokens(\n preFilteredToBeAddedAssets,\n );\n\n // In case accountsAndAssetsToUpdate event is fired with \"removed\" assets that don't exist, we don't want to remove them\n const filteredToBeRemovedAssets = removed.filter(\n (asset) => existing.includes(asset) && isCaipAssetType(asset),\n );\n\n if (\n filteredToBeAddedAssets.length > 0 ||\n filteredToBeRemovedAssets.length > 0\n ) {\n accountsAndAssetsToUpdate[accountId] = {\n added: filteredToBeAddedAssets,\n removed: filteredToBeRemovedAssets,\n };\n }\n\n for (const asset of existing) {\n assetsForMetadataRefresh.add(asset);\n }\n for (const asset of filteredToBeAddedAssets) {\n assetsForMetadataRefresh.add(asset);\n }\n for (const asset of filteredToBeRemovedAssets) {\n assetsForMetadataRefresh.delete(asset);\n }\n }\n }\n\n this.update((state) => {\n for (const [accountId, { added, removed }] of Object.entries(\n accountsAndAssetsToUpdate,\n )) {\n const assets = new Set([\n ...(state.accountsAssets[accountId] || []),\n ...added,\n ]);\n for (const asset of removed) {\n assets.delete(asset);\n }\n\n state.accountsAssets[accountId] = Array.from(assets);\n }\n });\n\n // Trigger fetching metadata for new assets\n await this.#refreshAssetsMetadata(Array.from(assetsForMetadataRefresh));\n\n this.messenger.publish(`${controllerName}:accountAssetListUpdated`, {\n assets: accountsAndAssetsToUpdate,\n });\n }\n\n /**\n * Checks for non-EVM accounts.\n *\n * @param account - The new account to be checked.\n * @returns True if the account is a non-EVM account, false otherwise.\n */\n #isNonEvmAccount(account: InternalAccount): boolean {\n return (\n !isEvmAccountType(account.type) &&\n // Non-EVM accounts are backed by a Snap for now\n account.metadata.snap !== undefined\n );\n }\n\n /**\n * Handles changes when a new account has been added.\n *\n * @param account - The new account being added.\n */\n async #handleOnAccountAdded(account: InternalAccount): Promise {\n if (!this.#isNonEvmAccount(account)) {\n // Nothing to do here for EVM accounts\n return;\n }\n this.#assertControllerMutexIsLocked();\n\n // Get assets list\n if (account.metadata.snap) {\n const allAssets = await this.#getAssetsList(\n account.id,\n account.metadata.snap.id,\n );\n const assets = await this.#filterBlockaidSpamTokens(allAssets);\n await this.#refreshAssetsMetadata(assets);\n this.update((state) => {\n state.accountsAssets[account.id] = assets;\n });\n this.messenger.publish(`${controllerName}:accountAssetListUpdated`, {\n assets: {\n [account.id]: {\n added: assets,\n removed: [],\n },\n },\n });\n }\n }\n\n /**\n * Handles changes when a new account has been removed.\n *\n * @param accountId - The new account id being removed.\n */\n async #handleOnAccountRemovedEvent(accountId: string): Promise {\n this.update((state) => {\n if (state.accountsAssets[accountId]) {\n delete state.accountsAssets[accountId];\n }\n if (state.allIgnoredAssets[accountId]) {\n delete state.allIgnoredAssets[accountId];\n }\n // TODO: We are not deleting the assetsMetadata because we will soon make this controller extends StaticIntervalPollingController\n // and update all assetsMetadata once a day.\n });\n }\n\n /**\n * Refreshes the assets snaps and metadata for the given list of assets\n *\n * @param assets - The assets to refresh\n */\n async #refreshAssetsMetadata(assets: CaipAssetType[]) {\n this.#assertControllerMutexIsLocked();\n\n const assetsWithoutMetadata: CaipAssetType[] = assets.filter(\n (asset) => !this.state.assetsMetadata[asset],\n );\n\n // Call the snap to get the metadata\n if (assetsWithoutMetadata.length > 0) {\n // Check if for every asset in assetsWithoutMetadata there is a snap in snaps by chainId else call getAssetSnaps\n if (\n !assetsWithoutMetadata.every((asset: CaipAssetType) => {\n const { chainId } = parseCaipAssetType(asset);\n return Boolean(this.#getAssetSnapFor(chainId));\n })\n ) {\n this.#snaps = this.#getAssetSnaps();\n }\n await this.#updateAssetsMetadata(assetsWithoutMetadata);\n }\n }\n\n /**\n * Updates the assets metadata for the given list of assets\n *\n * @param assets - The assets to update\n */\n async #updateAssetsMetadata(assets: CaipAssetType[]) {\n // Creates a mapping of scope to their respective assets list.\n const assetsByScope: Record = {};\n for (const asset of assets) {\n const { chainId } = parseCaipAssetType(asset);\n if (!assetsByScope[chainId]) {\n assetsByScope[chainId] = [];\n }\n assetsByScope[chainId].push(asset);\n }\n\n let newMetadata: Record = {};\n for (const chainId of Object.keys(assetsByScope) as CaipChainId[]) {\n const assetsForChain = assetsByScope[chainId];\n // Now fetch metadata from the associated asset Snaps:\n const snap = this.#getAssetSnapFor(chainId);\n if (snap) {\n const metadata = await this.#getAssetsMetadataFrom(\n assetsForChain,\n snap.id,\n );\n newMetadata = {\n ...newMetadata,\n ...(metadata?.assets ?? {}),\n };\n }\n }\n this.update((state) => {\n state.assetsMetadata = {\n ...this.state.assetsMetadata,\n ...newMetadata,\n };\n });\n }\n\n /**\n * Creates a mapping of CAIP-2 Chain ID to Asset Snaps.\n *\n * @returns A mapping of CAIP-2 Chain ID to Asset Snaps.\n */\n #getAssetSnaps(): Record {\n const snaps: Record = {};\n const allSnaps = this.#getAllSnaps();\n const allPermissions = allSnaps.map((snap) =>\n this.#getSnapsPermissions(snap.id),\n );\n\n for (const [index, permission] of allPermissions.entries()) {\n let scopes;\n for (const singlePermissionConstraint of Object.values(permission)) {\n scopes = getChainIdsCaveat(singlePermissionConstraint);\n if (!scopes) {\n continue;\n }\n for (const scope of scopes as CaipChainId[]) {\n if (!snaps[scope]) {\n snaps[scope] = [];\n }\n snaps[scope].push(allSnaps[index]);\n }\n }\n }\n return snaps;\n }\n\n /**\n * Returns the first asset snap for the given scope\n *\n * @param scope - The scope to get the asset snap for\n * @returns The asset snap for the given scope\n */\n #getAssetSnapFor(scope: CaipChainId): Snap | undefined {\n const allSnaps = this.#snaps[scope];\n // Pick only the first one, we ignore the other Snaps if there are multiple candidates for now.\n return allSnaps?.[0]; // Will be undefined if there's no Snaps candidate for this scope.\n }\n\n /**\n * Returns all the asset snaps\n *\n * @returns All the asset snaps\n */\n #getAllSnaps(): Snap[] {\n return this.messenger.call('SnapController:getRunnableSnaps');\n }\n\n /**\n * Returns the permissions for the given origin\n *\n * @param origin - The origin to get the permissions for\n * @returns The permissions for the given origin\n */\n #getSnapsPermissions(\n origin: string,\n ): SubjectPermissions {\n return this.messenger.call(\n 'PermissionController:getPermissions',\n origin,\n ) as SubjectPermissions;\n }\n\n /**\n * Returns the metadata for the given assets\n *\n * @param assets - The assets to get metadata for\n * @param snapId - The snap ID to get metadata from\n * @returns The metadata for the assets\n */\n async #getAssetsMetadataFrom(\n assets: CaipAssetType[],\n snapId: string,\n ): Promise {\n try {\n return (await this.messenger.call('SnapController:handleRequest', {\n snapId: snapId as SnapId,\n origin: 'metamask',\n handler: HandlerType.OnAssetsLookup,\n request: {\n jsonrpc: '2.0',\n method: 'onAssetLookup',\n params: {\n assets,\n },\n },\n })) as Promise;\n } catch (error) {\n // Ignore\n console.error(error);\n return undefined;\n }\n }\n\n /**\n * Filters out tokens flagged as malicious by Blockaid via the\n * `PhishingController:bulkScanTokens` messenger action. Only tokens with\n * an `assetNamespace` of \"token\" are scanned (native assets like slip44 are\n * passed through unfiltered). If the scan fails, all tokens are kept\n * (fail open).\n *\n * @param assets - The CAIP asset type list to filter.\n * @returns The filtered list with malicious tokens removed.\n */\n async #filterBlockaidSpamTokens(\n assets: CaipAssetType[],\n ): Promise {\n // Group scannable token assets by chain namespace\n const tokensByChain: Record<\n string,\n { asset: CaipAssetType; address: string }[]\n > = {};\n\n for (const asset of assets) {\n const { assetNamespace, assetReference, chain } =\n parseCaipAssetType(asset);\n\n // Only scan fungible token assets (e.g. SPL tokens), skip native (slip44)\n if (assetNamespace === 'token') {\n const chainName = chain.namespace;\n if (!tokensByChain[chainName]) {\n tokensByChain[chainName] = [];\n }\n tokensByChain[chainName].push({ asset, address: assetReference });\n }\n }\n\n // If there are no token assets to scan, return as-is\n if (Object.keys(tokensByChain).length === 0) {\n return assets;\n }\n\n // Build a set of assets to reject (non-benign tokens)\n const rejectedAssets = new Set();\n\n // PhishingController:bulkScanTokens rejects requests with more than\n // 100 tokens (returning {}). Batch addresses into chunks to stay within\n // the limit.\n const BATCH_SIZE = 100;\n\n for (const [chainName, tokenEntries] of Object.entries(tokensByChain)) {\n const addresses = tokenEntries.map((entry) => entry.address);\n\n // Create batches of BATCH_SIZE\n const batches: string[][] = [];\n for (let i = 0; i < addresses.length; i += BATCH_SIZE) {\n batches.push(addresses.slice(i, i + BATCH_SIZE));\n }\n\n // Scan all batches in parallel. Using Promise.allSettled so that a\n // single batch failure doesn't discard results from successful batches\n // (fail open at the batch level, not the chain level).\n const batchResults = await Promise.allSettled(\n batches.map((batch) =>\n this.messenger.call('PhishingController:bulkScanTokens', {\n chainId: chainName,\n tokens: batch,\n }),\n ),\n );\n\n // Merge results from fulfilled batches (rejected batches fail open)\n const scanResponse: BulkTokenScanResponse = {};\n for (const result of batchResults) {\n if (result.status === 'fulfilled') {\n Object.assign(scanResponse, result.value);\n }\n }\n\n for (const entry of tokenEntries) {\n const result = scanResponse[entry.address];\n if (result?.result_type === TokenScanResultType.Malicious) {\n rejectedAssets.add(entry.asset);\n }\n }\n }\n\n // Filter while preserving original order\n return assets.filter((asset) => !rejectedAssets.has(asset));\n }\n\n /**\n * Get assets list for an account\n *\n * @param accountId - AccountId to get assets for\n * @param snapId - Snap ID for the account\n * @returns list of assets\n */\n async #getAssetsList(\n accountId: string,\n snapId: string,\n ): Promise {\n return await this.#getClient(snapId).listAccountAssets(accountId);\n }\n\n /**\n * Gets a `KeyringClient` for a Snap.\n *\n * @param snapId - ID of the Snap to get the client for.\n * @returns A `KeyringClient` for the Snap.\n */\n #getClient(snapId: string): KeyringClient {\n return new KeyringClient({\n send: async (request: JsonRpcRequest) =>\n (await this.messenger.call('SnapController:handleRequest', {\n snapId: snapId as SnapId,\n origin: 'metamask',\n handler: HandlerType.OnKeyringRequest,\n request,\n })) as Promise,\n });\n }\n\n /**\n * Assert that the controller mutex is locked.\n *\n * @throws If the controller mutex is not locked.\n */\n #assertControllerMutexIsLocked() {\n if (!this.#controllerOperationMutex.isLocked()) {\n throw new Error(\n 'MultichainAssetsControllerError - Attempt to update state',\n );\n }\n }\n\n /**\n * Lock the controller mutex before executing the given function,\n * and release it after the function is resolved or after an\n * error is thrown.\n *\n * This wrapper ensures that each mutable operation that interacts with the\n * controller and that changes its state is executed in a mutually exclusive way,\n * preventing unsafe concurrent access that could lead to unpredictable behavior.\n *\n * @param callback - The function to execute while the controller mutex is locked.\n * @returns The result of the function.\n */\n async #withControllerLock(\n callback: MutuallyExclusiveCallback,\n ): Promise {\n return withLock(this.#controllerOperationMutex, callback);\n }\n}\n\n/**\n * Lock the given mutex before executing the given function,\n * and release it after the function is resolved or after an\n * error is thrown.\n *\n * @param mutex - The mutex to lock.\n * @param callback - The function to execute while the mutex is locked.\n * @returns The result of the function.\n */\nasync function withLock(\n mutex: Mutex,\n callback: MutuallyExclusiveCallback,\n): Promise {\n const releaseLock = await mutex.acquire();\n\n try {\n return await callback({ releaseLock });\n } finally {\n releaseLock();\n }\n}\n"]}