@electrum-cash/network/dist/index.mjs.map

@electrum-cash/network is a lightweight JavaScript library that lets you connect with one or more Electrum servers.

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{ default as ElectrumClient } from './electrum-client';\n\nexport * from './interfaces';\nexport * from './enums';\n","import debug from '@electrum-cash/debug-logs';\nimport { ElectrumConnection } from './electrum-connection';\nimport { ElectrumProtocol } from './electrum-protocol';\nimport { defaultNetworkOptions } from './constants';\nimport { EventEmitter } from 'eventemitter3';\nimport { ConnectionStatus } from './enums';\nimport { RPCParameter, isRPCNotification, isRPCErrorResponse, RPCNotification, RPCResponse } from './rpc-interfaces';\nimport { Mutex } from 'async-mutex';\n\nimport type { ElectrumNetworkOptions, ElectrumClientEvents, ElectrumSocket, ResolveFunction, RequestResolver, RequestResponse } from './interfaces';\n\n/**\n * High-level Electrum client that lets applications send requests and subscribe to notification events from a server.\n */\nclass ElectrumClient<ElectrumEvents extends ElectrumClientEvents> extends EventEmitter<ElectrumClientEvents | ElectrumEvents> implements ElectrumClientEvents\n{\n\t/**\n\t * The name and version of the server software indexing the blockchain.\n\t */\n\tpublic software: string;\n\n\t/**\n\t * The genesis hash of the blockchain indexed by the server.\n\t * @remarks This is only available after a 'server.features' call.\n\t */\n\tpublic genesisHash: string;\n\n\t/**\n\t * The chain height of the blockchain indexed by the server.\n\t * @remarks This is only available after a 'blockchain.headers.subscribe' call.\n\t */\n\tpublic chainHeight: number;\n\n\t/**\n\t * Timestamp of when we last received data from the server indexing the blockchain.\n\t */\n\tpublic lastReceivedTimestamp: number;\n\n\t/**\n\t * Number corresponding to the underlying connection status.\n\t */\n\tpublic get status(): ConnectionStatus\n\t{\n\t\treturn this.connection.status;\n\t}\n\n\t// Declare instance variables\n\tprivate connection: ElectrumConnection;\n\n\t// Initialize an empty list of subscription metadata.\n\tprivate subscriptionMethods: Record<string, Set<string>> = {};\n\n\t// Start counting the request IDs from 0\n\tprivate requestId = 0;\n\n\t// Initialize an empty dictionary for keeping track of request resolvers\n\tprivate requestResolvers: { [index: number]: RequestResolver } = {};\n\n\t// Mutex lock used to prevent simultaneous connect() and disconnect() calls.\n\tprivate connectionLock = new Mutex();\n\n\t/**\n\t * Initializes an Electrum client.\n\t *\n\t * @param application       - your application name, used to identify to the electrum host.\n\t * @param version           - protocol version to use with the host.\n\t * @param socketOrHostname  - pre-configured electrum socket or fully qualified domain name or IP number of the host\n\t * @param options           - ...\n\t *\n\t * @throws {Error} if `version` is not a valid version string.\n\t */\n\tconstructor(\n\t\tpublic application: string,\n\t\tpublic version: string,\n\t\tpublic socketOrHostname: ElectrumSocket | string,\n\t\tpublic options: ElectrumNetworkOptions = {},\n\t)\n\t{\n\t\t// Initialize the event emitter.\n\t\tsuper();\n\n\t\t// Update default options with the provided values.\n\t\tconst networkOptions: ElectrumNetworkOptions = { ...defaultNetworkOptions, ...options };\n\n\t\t// Set up a connection to an electrum server.\n\t\tthis.connection = new ElectrumConnection(application, version, socketOrHostname, networkOptions);\n\t}\n\n\t// Expose hostIdentifier from the connection.\n\tget hostIdentifier(): string\n\t{\n\t\treturn this.connection.hostIdentifier;\n\t}\n\n\t// Expose port from the connection.\n\tget encrypted(): boolean\n\t{\n\t\treturn this.connection.encrypted;\n\t}\n\n\t/**\n\t * Connects to the remote server.\n\t *\n\t * @throws {Error} if the socket connection fails.\n\t * @returns a promise resolving when the connection is established.\n\t */\n\tasync connect(): Promise<void>\n\t{\n\t\t// Create a lock so that multiple connects/disconnects cannot race each other.\n\t\tconst unlock = 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functions.\n\t\t\tthis.connection.on('version', this.storeSoftwareVersion.bind(this));\n\t\t\tthis.connection.on('received', this.updateLastReceivedTimestamp.bind(this));\n\n\t\t\t// Relay error events.\n\t\t\tthis.connection.on('error', this.emit.bind(this, 'error'));\n\n\t\t\t// Connect with the server.\n\t\t\tawait this.connection.connect();\n\t\t}\n\t\t// Always release our lock so that we do not end up in a stuck-state.\n\t\tfinally\n\t\t{\n\t\t\tunlock();\n\t\t}\n\t}\n\n\t/**\n\t * Disconnects from the remote server and removes all event listeners/subscriptions and open requests.\n\t *\n\t * @param force               - disconnect even if the connection has not been fully established yet.\n\t * @param retainSubscriptions - retain subscription data so they will be restored on reconnection.\n\t *\n\t * @returns true if successfully disconnected, or false if there was no connection.\n\t */\n\tasync disconnect(force: boolean = false, retainSubscriptions: boolean = false): Promise<boolean>\n\t{\n\t\tif(!retainSubscriptions)\n\t\t{\n\t\t\t// Cancel all event listeners.\n\t\t\tthis.removeAllListeners();\n\n\t\t\t// Remove all subscription data\n\t\t\tthis.subscriptionMethods = {};\n\t\t}\n\n\t\t// Disconnect from the remote server.\n\t\treturn this.connection.disconnect(force);\n\t}\n\n\t/**\n\t * Calls a method on the remote server with the supplied parameters.\n\t *\n\t * @param method     - name of the method to call.\n\t * @param parameters - one or more parameters for the method.\n\t *\n\t * @throws {Error} if the client is disconnected.\n\t * @returns a promise that resolves with the result of the method or an Error.\n\t */\n\tasync request(method: string, ...parameters: RPCParameter[]): Promise<Error | RequestResponse>\n\t{\n\t\t// If we are not connected to a server..\n\t\tif(this.connection.status !== ConnectionStatus.CONNECTED)\n\t\t{\n\t\t\t// Reject the request with a disconnected error message.\n\t\t\tthrow(new Error(`Unable to send request to a disconnected server '${this.hostIdentifier}'.`));\n\t\t}\n\n\t\t// Increase the request ID by one.\n\t\tthis.requestId += 1;\n\n\t\t// Store a copy of the request id.\n\t\tconst id = this.requestId;\n\n\t\t// Format the arguments as an electrum request object.\n\t\tconst message = ElectrumProtocol.buildRequestObject(method, parameters, id);\n\n\t\t// Define a function to wrap the request in a promise.\n\t\tconst requestResolver = (resolve: ResolveFunction<Error | RequestResponse>): void =>\n\t\t{\n\t\t\t// Add a request resolver for this promise to the list of requests.\n\t\t\tthis.requestResolvers[id] = (error?: Error, data?: RequestResponse) =>\n\t\t\t{\n\t\t\t\t// If the resolution failed..\n\t\t\t\tif(error)\n\t\t\t\t{\n\t\t\t\t\t// Resolve the promise with the error for the application to handle.\n\t\t\t\t\tresolve(error);\n\t\t\t\t}\n\t\t\t\telse\n\t\t\t\t{\n\t\t\t\t\t// Resolve the promise with the request results.\n\t\t\t\t\tresolve(data);\n\t\t\t\t}\n\t\t\t};\n\n\t\t\t// Send the request message to the remote server.\n\t\t\tthis.connection.send(message);\n\t\t};\n\n\t\t// Write a log message.\n\t\tdebug.network(`Sending request '${method}' to '${this.hostIdentifier}'`);\n\n\t\t// return a promise to deliver results later.\n\t\treturn new Promise<Error | RequestResponse>(requestResolver);\n\t}\n\n\t/**\n\t * Subscribes to the method and payload at the server.\n\t *\n\t * @remarks the response for the subscription request is issued as a notification event.\n\t *\n\t * @param method     - one of the subscribable methods the server supports.\n\t * @param parameters - one or more parameters for the method.\n\t *\n\t * @throws {Error} if the client is disconnected.\n\t * @returns a promise resolving when the subscription is established.\n\t */\n\tasync subscribe(method: string, ...parameters: RPCParameter[]): Promise<void>\n\t{\n\t\t// Initialize an empty list of subscription payloads, if needed.\n\t\tif(!this.subscriptionMethods[method])\n\t\t{\n\t\t\tthis.subscriptionMethods[method] = new Set<string>();\n\t\t}\n\n\t\t// Store the subscription parameters to track what data we have subscribed to.\n\t\tthis.subscriptionMethods[method].add(JSON.stringify(parameters));\n\n\t\t// Send initial subscription request.\n\t\tconst requestData = await this.request(method, ...parameters);\n\n\t\t// If the request failed, throw it as an error.\n\t\tif(requestData instanceof Error)\n\t\t{\n\t\t\tthrow(requestData);\n\t\t}\n\n\t\t// If the request returned more than one data point..\n\t\tif(Array.isArray(requestData))\n\t\t{\n\t\t\t// .. throw an error, as this breaks our expectation for subscriptions.\n\t\t\tthrow(new Error('Subscription request returned an more than one data point.'));\n\t\t}\n\n\t\t// Construct a notification structure to package the initial result as a notification.\n\t\tconst notification: RPCNotification =\n\t\t{\n\t\t\tjsonrpc: '2.0',\n\t\t\tmethod: method,\n\t\t\tparams: [ ...parameters, requestData ],\n\t\t};\n\n\t\t// Manually emit an event for the initial response.\n\t\tthis.emit('notification', notification);\n\n\t\t// Try to update the chain height.\n\t\tthis.updateChainHeightFromHeadersNotifications(notification);\n\t}\n\n\t/**\n\t * Unsubscribes to the method at the server and removes any callback functions\n\t * when there are no more subscriptions for the method.\n\t *\n\t * @param method     - a previously subscribed to method.\n\t * @param parameters - one or more parameters for the method.\n\t *\n\t * @throws {Error} if no subscriptions exist for the combination of the provided `method` and `parameters.\n\t * @throws {Error} if the client is disconnected.\n\t * @returns a promise resolving when the subscription is removed.\n\t */\n\tasync unsubscribe(method: string, ...parameters: RPCParameter[]): Promise<void>\n\t{\n\t\t// Throw an error if the client is disconnected.\n\t\tif(this.connection.status !== ConnectionStatus.CONNECTED)\n\t\t{\n\t\t\tthrow(new Error(`Unable to send unsubscribe request to a disconnected server '${this.hostIdentifier}'.`));\n\t\t}\n\n\t\t// If this method has no subscriptions..\n\t\tif(!this.subscriptionMethods[method])\n\t\t{\n\t\t\t// Reject this promise with an explanation.\n\t\t\tthrow(new Error(`Cannot unsubscribe from '${method}' since the method has no subscriptions.`));\n\t\t}\n\n\t\t// Pack up the parameters as a long string.\n\t\tconst subscriptionParameters = JSON.stringify(parameters);\n\n\t\t// If the method payload could not be located..\n\t\tif(!this.subscriptionMethods[method].has(subscriptionParameters))\n\t\t{\n\t\t\t// Reject this promise with an explanation.\n\t\t\tthrow(new Error(`Cannot unsubscribe from '${method}' since it has no subscription with the given parameters.`));\n\t\t}\n\n\t\t// Remove this specific subscription payload from internal tracking.\n\t\tthis.subscriptionMethods[method].delete(subscriptionParameters);\n\n\t\t// Send unsubscription request to the server\n\t\t// NOTE: As a convenience we allow users to define the method as the subscribe or unsubscribe version.\n\t\tawait this.request(method.replace('.subscribe', '.unsubscribe'), ...parameters);\n\n\t\t// Write a log message.\n\t\tdebug.client(`Unsubscribed from '${String(method)}' for the '${subscriptionParameters}' parameters.`);\n\t}\n\n\t/**\n\t * Restores existing subscriptions without updating status or triggering manual callbacks.\n\t *\n\t * @throws {Error} if subscription data cannot be found for all stored event names.\n\t * @throws {Error} if the client is disconnected.\n\t * @returns a promise resolving to true when the subscriptions are restored.\n\t *\n\t * @ignore\n\t */\n\tprivate async resubscribeOnConnect(): Promise<void>\n\t{\n\t\t// Write a log message.\n\t\tdebug.client(`Connected to '${this.hostIdentifier}'.`);\n\n\t\t// Synchronize with the underlying connection status.\n\t\tthis.handleConnectionStatusChanges('connected');\n\n\t\t// Initialize an empty list of resubscription promises.\n\t\tconst resubscriptionPromises = [];\n\n\t\t// For each method we have a subscription for..\n\t\tfor(const method in this.subscriptionMethods)\n\t\t{\n\t\t\t// .. and for each parameter we have previously been subscribed to..\n\t\t\tfor(const parameterJSON of this.subscriptionMethods[method].values())\n\t\t\t{\n\t\t\t\t// restore the parameters from JSON.\n\t\t\t\tconst parameters = JSON.parse(parameterJSON);\n\n\t\t\t\t// Send a subscription request.\n\t\t\t\tresubscriptionPromises.push(this.subscribe(method, ...parameters));\n\t\t\t}\n\n\t\t\t// Wait for all re-subscriptions to complete.\n\t\t\tawait Promise.all(resubscriptionPromises);\n\t\t}\n\n\t\t// Write a log message if there was any subscriptions to restore.\n\t\tif(resubscriptionPromises.length > 0)\n\t\t{\n\t\t\tdebug.client(`Restored ${resubscriptionPromises.length} previous subscriptions for '${this.hostIdentifier}'`);\n\t\t}\n\t}\n\n\t/**\n\t * Parser messages from the remote server to resolve request promises and emit subscription events.\n\t *\n\t * @param message - the response message\n\t *\n\t * @throws {Error} if the message ID does not match an existing request.\n\t * @ignore\n\t */\n\tresponse(message: RPCResponse): void\n\t{\n\t\t// If the received message is a notification, we forward it to all event listeners\n\t\tif(isRPCNotification(message))\n\t\t{\n\t\t\t// Write a log message.\n\t\t\tdebug.client(`Received notification for '${message.method}' from '${this.hostIdentifier}'`);\n\n\t\t\t// Forward the message content to all event listeners.\n\t\t\tthis.emit('notification', message);\n\n\t\t\t// Try to update the chain height.\n\t\t\tthis.updateChainHeightFromHeadersNotifications(message);\n\n\t\t\t// Return since it does not have an associated request resolver\n\t\t\treturn;\n\t\t}\n\n\t\t// If the response ID is null we cannot use it to index our request resolvers\n\t\tif(message.id === null)\n\t\t{\n\t\t\t// Throw an internal error, this should not happen.\n\t\t\tthrow(new Error('Internal error: Received an RPC response with ID null.'));\n\t\t}\n\n\t\t// Look up which request promise we should resolve this.\n\t\tconst requestResolver = this.requestResolvers[message.id];\n\n\t\t// If we do not have a request resolver for this response message..\n\t\tif(!requestResolver)\n\t\t{\n\t\t\t// Log that a message was ignored since the request has already been rejected.\n\t\t\tdebug.warning(`Ignoring response #${message.id} as the request has already been rejected.`);\n\n\t\t\t// Return as this has now been fully handled.\n\t\t\treturn;\n\t\t}\n\n\t\t// Remove the promise from the request list.\n\t\tdelete this.requestResolvers[message.id];\n\n\t\t// If the message contains an error..\n\t\tif(isRPCErrorResponse(message))\n\t\t{\n\t\t\t// Forward the message error to the request resolver and omit the `result` parameter.\n\t\t\trequestResolver(new Error(message.error.message));\n\t\t}\n\t\telse\n\t\t{\n\t\t\t// Forward the message content to the request resolver and omit the `error` parameter\n\t\t\t// (by setting it to undefined).\n\t\t\trequestResolver(undefined, message.result);\n\n\t\t\t// Attempt to extract genesis hash from feature requests.\n\t\t\tthis.storeGenesisHashFromFeaturesResponse(message);\n\t\t}\n\t}\n\n\t/**\n\t * Callback function that is called when connection to the Electrum server is lost.\n\t * Aborts all active requests with an error message indicating that connection was lost.\n\t *\n\t * @ignore\n\t */\n\tasync onConnectionDisconnect(): Promise<void>\n\t{\n\t\t// Loop over active requests\n\t\tfor(const resolverId in this.requestResolvers)\n\t\t{\n\t\t\t// Extract request resolver for readability\n\t\t\tconst requestResolver = this.requestResolvers[resolverId];\n\n\t\t\t// Resolve the active request with an error indicating that the connection was lost.\n\t\t\trequestResolver(new Error('Connection lost'));\n\n\t\t\t// Remove the promise from the request list.\n\t\t\tdelete this.requestResolvers[resolverId];\n\t\t}\n\n\t\t// Synchronize with the underlying connection status.\n\t\tthis.handleConnectionStatusChanges('disconnected');\n\t}\n\n\t/**\n\t * Stores the server provider software version field on successful version negotiation.\n\t *\n\t * @ignore\n\t */\n\tasync storeSoftwareVersion(versionStatement): Promise<void>\n\t{\n\t\t// TODO: handle failed version negotiation better.\n\t\tif(versionStatement.error)\n\t\t{\n\t\t\t// Do nothing.\n\t\t\treturn;\n\t\t}\n\n\t\t// Store the software version.\n\t\tthis.software = versionStatement.software;\n\t}\n\n\t/**\n\t * Updates the last received timestamp.\n\t *\n\t * @ignore\n\t */\n\tasync updateLastReceivedTimestamp(): Promise<void>\n\t{\n\t\t// Update the timestamp for when we last received data.\n\t\tthis.lastReceivedTimestamp = Date.now();\n\t}\n\n\t/**\n\t * Checks if the provided message is a response to a headers subscription,\n\t * and if so updates the locally stored chain height value for this client.\n\t *\n\t * @ignore\n\t */\n\tasync updateChainHeightFromHeadersNotifications(message): Promise<void>\n\t{\n\t\t// If the message is a notification for a new chain height..\n\t\tif(message.method === 'blockchain.headers.subscribe')\n\t\t{\n\t\t\t// ..also store the updated chain height locally.\n\t\t\tthis.chainHeight = message.params[0].height;\n\t\t}\n\t}\n\n\t/**\n\t * Checks if the provided message is a response to a server.features request,\n\t * and if so stores the genesis hash for this client locally.\n\t *\n\t * @ignore\n\t */\n\tasync storeGenesisHashFromFeaturesResponse(message): Promise<void>\n\t{\n\t\ttry\n\t\t{\n\t\t\t// If the message is a response to a features request..\n\t\t\tif(typeof message.result.genesis_hash !== 'undefined')\n\t\t\t{\n\t\t\t\t// ..store the genesis hash locally.\n\t\t\t\tthis.genesisHash = message.result.genesis_hash;\n\t\t\t}\n\t\t}\n\t\tcatch(error)\n\t\t{\n\t\t\t// Do nothing.\n\t\t}\n\t}\n\n\t/**\n\t * Helper function to synchronize state and events with the underlying connection.\n\t */\n\tasync handleConnectionStatusChanges(eventName): Promise<void>\n\t{\n\t\t// Re-emit the event.\n\t\tthis.emit(eventName);\n\t}\n\n\t// Add magic glue that makes typedoc happy so that we can have the events listed on the class.\n\tpublic readonly connecting: [];\n\tpublic readonly connected: [];\n\tpublic readonly disconnecting: [];\n\tpublic readonly disconnected: [];\n\tpublic readonly reconnecting: [];\n\tpublic readonly notification: [ RPCNotification ];\n\tpublic readonly error: [ Error ];\n}\n\n// Export the client.\nexport default ElectrumClient;\n","import debug from '@electrum-cash/debug-logs';\nimport { ElectrumWebSocket } from '@electrum-cash/web-socket';\nimport { ElectrumProtocol } from './electrum-protocol';\nimport { ElectrumNetworkOptions, ElectrumConnectionEvents, ElectrumSocket, ResolveFunction, RejectFunction, VersionNegotiationResponse, isVersionRejected } from './interfaces';\nimport { isRPCNotification, isRPCErrorResponse, RPCResponse, RPCErrorResponse } from './rpc-interfaces';\nimport { EventEmitter } from 'eventemitter3';\nimport { ConnectionStatus } from './enums';\nimport { parse, parseNumberAndBigInt } from 'lossless-json';\n\n/**\n * Wrapper around TLS/WSS sockets that gracefully separates a network stream into Electrum protocol messages.\n */\nexport class ElectrumConnection extends EventEmitter<ElectrumConnectionEvents>\n{\n\t// Initialize the connected flag to false to indicate that there is no connection\n\tpublic status: ConnectionStatus = ConnectionStatus.DISCONNECTED;\n\n\t// Declare empty timestamps\n\tprivate lastReceivedTimestamp: number;\n\n\t// Declare an empty socket.\n\tprivate socket: ElectrumSocket;\n\n\t// Declare timers for keep-alive pings and reconnection\n\tprivate keepAliveTimer?: number;\n\tprivate reconnectTimer?: number;\n\n\t// Initialize an empty array of connection verification timers.\n\tprivate verifications: Array<number> = [];\n\n\t// Initialize messageBuffer to an empty string\n\tprivate messageBuffer = '';\n\n\t/**\n\t * Sets up network configuration for an Electrum client connection.\n\t *\n\t * @param application       - your application name, used to identify to the electrum host.\n\t * @param version           - protocol version to use with the host.\n\t * @param socketOrHostname  - pre-configured electrum socket or fully qualified domain name or IP number of the host\n\t * @param options           - ...\n\t *\n\t * @throws {Error} if `version` is not a valid version string.\n\t */\n\tconstructor(\n\t\tprivate application: string,\n\t\tprivate version: string,\n\t\tprivate socketOrHostname: ElectrumSocket | string,\n\t\tprivate options: ElectrumNetworkOptions,\n\t)\n\t{\n\t\t// Initialize the event emitter.\n\t\tsuper();\n\n\t\t// Check if the provided version is a valid version number.\n\t\tif(!ElectrumProtocol.versionRegexp.test(version))\n\t\t{\n\t\t\t// Throw an error since the version number was not valid.\n\t\t\tthrow(new Error(`Provided version string (${version}) is not a valid protocol version number.`));\n\t\t}\n\n\t\t// If a hostname was provided..\n\t\tif(typeof socketOrHostname === 'string')\n\t\t{\n\t\t\t// Use a web socket with default parameters.\n\t\t\tthis.socket = new ElectrumWebSocket(socketOrHostname);\n\t\t}\n\t\telse\n\t\t{\n\t\t\t// Use the provided socket.\n\t\t\tthis.socket = socketOrHostname;\n\t\t}\n\n\t\t// Set up handlers for connection and disconnection.\n\t\tthis.socket.on('connected', this.onSocketConnect.bind(this));\n\t\tthis.socket.on('disconnected', this.onSocketDisconnect.bind(this));\n\n\t\t// Set up handler for incoming data.\n\t\tthis.socket.on('data', this.parseMessageChunk.bind(this));\n\n\t\t// Handle visibility changes when run in a browser environment (if not explicitly disabled).\n\t\tif(typeof document !== 'undefined' && !this.options.disableBrowserVisibilityHandling)\n\t\t{\n\t\t\tdocument.addEventListener('visibilitychange', this.handleVisibilityChange.bind(this));\n\t\t}\n\n\t\t// Handle network connection changes when run in a browser environment (if not explicitly disabled).\n\t\tif(typeof window !== 'undefined' && !this.options.disableBrowserConnectivityHandling)\n\t\t{\n\t\t\twindow.addEventListener('online', this.handleNetworkChange.bind(this));\n\t\t\twindow.addEventListener('offline', this.handleNetworkChange.bind(this));\n\t\t}\n\t}\n\n\t// Expose hostIdentifier from the socket.\n\tget hostIdentifier(): string\n\t{\n\t\treturn this.socket.hostIdentifier;\n\t}\n\n\t// Expose port from the socket.\n\tget encrypted(): boolean\n\t{\n\t\treturn this.socket.encrypted;\n\t}\n\n\t/**\n\t * Assembles incoming data into statements and hands them off to the message parser.\n\t *\n\t * @param data - data to append to the current message buffer, as a string.\n\t *\n\t * @throws {SyntaxError} if the passed statement parts are not valid JSON.\n\t */\n\tparseMessageChunk(data: string): void\n\t{\n\t\t// Update the timestamp for when we last received data.\n\t\tthis.lastReceivedTimestamp = Date.now();\n\n\t\t// Emit a notification indicating that the connection has received data.\n\t\tthis.emit('received');\n\n\t\t// Clear and remove all verification timers.\n\t\tthis.verifications.forEach((timer) => clearTimeout(timer));\n\t\tthis.verifications.length = 0;\n\n\t\t// Add the message to the current message buffer.\n\t\tthis.messageBuffer += data;\n\n\t\t// Check if the new message buffer contains the statement delimiter.\n\t\twhile(this.messageBuffer.includes(ElectrumProtocol.statementDelimiter))\n\t\t{\n\t\t\t// Split message buffer into statements.\n\t\t\tconst statementParts = this.messageBuffer.split(ElectrumProtocol.statementDelimiter);\n\n\t\t\t// For as long as we still have statements to parse..\n\t\t\twhile(statementParts.length > 1)\n\t\t\t{\n\t\t\t\t// Move the first statement to its own variable.\n\t\t\t\tconst currentStatementList = String(statementParts.shift());\n\n\t\t\t\t// Parse the statement into an object or list of objects.\n\t\t\t\tlet statementList = parse(currentStatementList, null, this.options.useBigInt ? parseNumberAndBigInt : parseFloat) as RPCResponse | RPCResponse[];\n\n\t\t\t\t// Wrap the statement in an array if it is not already a batched statement list.\n\t\t\t\tif(!Array.isArray(statementList))\n\t\t\t\t{\n\t\t\t\t\tstatementList = [ statementList ];\n\t\t\t\t}\n\n\t\t\t\t// For as long as there is statements in the result set..\n\t\t\t\twhile(statementList.length > 0)\n\t\t\t\t{\n\t\t\t\t\t// Move the first statement from the batch to its own variable.\n\t\t\t\t\tconst currentStatement = statementList.shift();\n\n\t\t\t\t\t// If the current statement is a subscription notification..\n\t\t\t\t\tif(isRPCNotification(currentStatement))\n\t\t\t\t\t{\n\t\t\t\t\t\t// Emit the notification for handling higher up in the stack.\n\t\t\t\t\t\tthis.emit('response', currentStatement);\n\n\t\t\t\t\t\t// Consider this statement handled.\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t}\n\n\t\t\t\t\t// If the current statement is a version negotiation response..\n\t\t\t\t\tif(currentStatement.id === 'versionNegotiation')\n\t\t\t\t\t{\n\t\t\t\t\t\tif(isRPCErrorResponse(currentStatement))\n\t\t\t\t\t\t{\n\t\t\t\t\t\t\t// Then emit a failed version negotiation response signal.\n\t\t\t\t\t\t\tthis.emit('version', { error: currentStatement.error });\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse\n\t\t\t\t\t\t{\n\t\t\t\t\t\t\t// Extract the software and protocol version reported.\n\t\t\t\t\t\t\tconst [ software, protocol ] = currentStatement.result;\n\n\t\t\t\t\t\t\t// Emit a successful version negotiation response signal.\n\t\t\t\t\t\t\tthis.emit('version', { software, protocol });\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\t// Consider this statement handled.\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t}\n\n\t\t\t\t\t// If the current statement is a keep-alive response..\n\t\t\t\t\tif(currentStatement.id === 'keepAlive')\n\t\t\t\t\t{\n\t\t\t\t\t\t// Do nothing and consider this statement handled.\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t}\n\n\t\t\t\t\t// Emit the statements for handling higher up in the stack.\n\t\t\t\t\tthis.emit('response', currentStatement);\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Store the remaining statement as the current message buffer.\n\t\t\tthis.messageBuffer = statementParts.shift() || '';\n\t\t}\n\t}\n\n\t/**\n\t * Sends a keep-alive message to the host.\n\t *\n\t * @returns true if the ping message was fully flushed to the socket, false if\n\t * part of the message is queued in the user memory\n\t */\n\tping(): boolean\n\t{\n\t\t// Write a log message.\n\t\tdebug.ping(`Sending keep-alive ping to '${this.hostIdentifier}'`);\n\n\t\t// Craft a keep-alive message.\n\t\tconst message = ElectrumProtocol.buildRequestObject('server.ping', [], 'keepAlive');\n\n\t\t// Send the keep-alive message.\n\t\tconst status = this.send(message);\n\n\t\t// Return the ping status.\n\t\treturn status;\n\t}\n\n\t/**\n\t * Initiates the network connection negotiates a protocol version. Also emits the 'connect' signal if successful.\n\t *\n\t * @throws {Error} if the socket connection fails.\n\t * @returns a promise resolving when the connection is established\n\t */\n\tasync connect(): Promise<void>\n\t{\n\t\t// If we are already connected return true.\n\t\tif(this.status === ConnectionStatus.CONNECTED)\n\t\t{\n\t\t\treturn;\n\t\t}\n\n\t\t// Indicate that the connection is connecting\n\t\tthis.status = ConnectionStatus.CONNECTING;\n\n\t\t// Emit a connect event now that the connection is being set up.\n\t\tthis.emit('connecting');\n\n\t\t// Define a function to wrap connection as a promise.\n\t\tconst connectionResolver = (resolve: ResolveFunction<void>, reject: RejectFunction): void =>\n\t\t{\n\t\t\tconst rejector = (error: Error): void =>\n\t\t\t{\n\t\t\t\t// Set the status back to disconnected\n\t\t\t\tthis.status = ConnectionStatus.DISCONNECTED;\n\n\t\t\t\t// Emit a connect event indicating that we failed to connect.\n\t\t\t\tthis.emit('disconnected');\n\n\t\t\t\t// Reject with the error as reason\n\t\t\t\treject(error);\n\t\t\t};\n\n\t\t\t// Replace previous error handlers to reject the promise on failure.\n\t\t\tthis.socket.removeAllListeners('error');\n\t\t\tthis.socket.once('error', rejector);\n\n\t\t\t// Define a function to wrap version negotiation as a callback.\n\t\t\tconst versionNegotiator = (): void =>\n\t\t\t{\n\t\t\t\t// Write a log message to show that we have started version negotiation.\n\t\t\t\tdebug.network(`Requesting protocol version ${this.version} with '${this.hostIdentifier}'.`);\n\n\t\t\t\t// remove the one-time error handler since no error was detected.\n\t\t\t\tthis.socket.removeListener('error', rejector);\n\n\t\t\t\t// Build a version negotiation message.\n\t\t\t\tconst versionMessage = ElectrumProtocol.buildRequestObject('server.version', [ this.application, this.version ], 'versionNegotiation');\n\n\t\t\t\t// Define a function to wrap version validation as a function.\n\t\t\t\tconst versionValidator = (version: VersionNegotiationResponse): void =>\n\t\t\t\t{\n\t\t\t\t\t// Check if version negotiation failed.\n\t\t\t\t\tif(isVersionRejected(version))\n\t\t\t\t\t{\n\t\t\t\t\t\t// Disconnect from the host.\n\t\t\t\t\t\tthis.disconnect(true);\n\n\t\t\t\t\t\t// Declare an error message.\n\t\t\t\t\t\tconst errorMessage = 'unsupported protocol version.';\n\n\t\t\t\t\t\t// Log the error.\n\t\t\t\t\t\tdebug.errors(`Failed to connect with ${this.hostIdentifier} due to ${errorMessage}`);\n\n\t\t\t\t\t\t// Reject the connection with false since version negotiation failed.\n\t\t\t\t\t\treject(errorMessage);\n\t\t\t\t\t}\n\t\t\t\t\t// Check if the host supports our requested protocol version.\n\t\t\t\t\t// NOTE: the server responds with version numbers that truncate 0's, so 1.5.0 turns into 1.5.\n\t\t\t\t\telse if((version.protocol !== this.version) && (`${version.protocol}.0` !== this.version) && (`${version.protocol}.0.0` !== this.version))\n\t\t\t\t\t{\n\t\t\t\t\t\t// Disconnect from the host.\n\t\t\t\t\t\tthis.disconnect(true);\n\n\t\t\t\t\t\t// Declare an error message.\n\t\t\t\t\t\tconst errorMessage = `incompatible protocol version negotiated (${version.protocol} !== ${this.version}).`;\n\n\t\t\t\t\t\t// Log the error.\n\t\t\t\t\t\tdebug.errors(`Failed to connect with ${this.hostIdentifier} due to ${errorMessage}`);\n\n\t\t\t\t\t\t// Reject the connection with false since version negotiation failed.\n\t\t\t\t\t\treject(errorMessage);\n\t\t\t\t\t}\n\t\t\t\t\telse\n\t\t\t\t\t{\n\t\t\t\t\t\t// Write a log message.\n\t\t\t\t\t\tdebug.network(`Negotiated protocol version ${version.protocol} with '${this.hostIdentifier}', powered by ${version.software}.`);\n\n\t\t\t\t\t\t// Set connection status to connected\n\t\t\t\t\t\tthis.status = ConnectionStatus.CONNECTED;\n\n\t\t\t\t\t\t// Emit a connect event now that the connection is usable.\n\t\t\t\t\t\tthis.emit('connected');\n\n\t\t\t\t\t\t// Resolve the connection promise since we successfully connected and negotiated protocol version.\n\t\t\t\t\t\tresolve();\n\t\t\t\t\t}\n\t\t\t\t};\n\n\t\t\t\t// Listen for version negotiation once.\n\t\t\t\tthis.once('version', versionValidator);\n\n\t\t\t\t// Send the version negotiation message.\n\t\t\t\tthis.send(versionMessage);\n\t\t\t};\n\n\t\t\t// Prepare the version negotiation.\n\t\t\tthis.socket.once('connected', versionNegotiator);\n\n\t\t\t// Set up handler for network errors.\n\t\t\tthis.socket.on('error', this.onSocketError.bind(this));\n\n\t\t\t// Connect to the server.\n\t\t\tthis.socket.connect();\n\t\t};\n\n\t\t// Wait until connection is established and version negotiation succeeds.\n\t\tawait new Promise<void>(connectionResolver);\n\t}\n\n\t/**\n\t * Restores the network connection.\n\t */\n\tasync reconnect(): Promise<void>\n\t{\n\t\t// If a reconnect timer is set, remove it\n\t\tawait this.clearReconnectTimer();\n\n\t\t// Write a log message.\n\t\tdebug.network(`Trying to reconnect to '${this.hostIdentifier}'..`);\n\n\t\t// Set the st