rapid-mq/dist/index.mjs.map

A simple and fast RabbitMQ client for Node.js

{"version":3,"sources":["../src/rapid-connector.ts","../src/rapic-encoder.ts","../src/messager.ts","../src/pubsub-messager.ts","../src/rpc-messager.ts","../src/direct-messager.ts"],"sourcesContent":["/**\r\n * RapidConnector - Handles connection management to RabbitMQ for the rapid-mq package.\r\n * Provides methods to connect, disconnect, and access the underlying connection.\r\n */\r\n\r\nimport * as amqp from 'amqplib';\r\nimport { DefaultRapidEncoder, RapidEncoder } from './rapic-encoder';\r\n\r\n/**\r\n * Options for creating a RapidConnector instance.\r\n */\r\nexport interface RapidConnectorOptions {\r\n    /** The RabbitMQ connection URL (e.g., amqp://user:pass@host:port/vhost) */\r\n    url: string;\r\n    /** Unique application identifier for this connector */\r\n    appId: string;\r\n    /** Optional encoder for message serialization */\r\n    encoder?: RapidEncoder;\r\n}\r\n\r\n/**\r\n * RapidConnector provides a simple interface to manage a RabbitMQ connection.\r\n */\r\nexport class RapidConnector {\r\n    private _url: string;\r\n    private _appId: string;\r\n    private _connection: amqp.ChannelModel | null = null;\r\n    private _isConnected: boolean = false;\r\n    private _encoder: RapidEncoder;\r\n\r\n    /**\r\n     * Constructs a new RapidConnector.\r\n     * @param options - Configuration options for the connector.\r\n     * @throws {Error} If url or appId is not provided.\r\n     */\r\n    constructor(private options: RapidConnectorOptions) {\r\n        if (!options.url) {\r\n            throw new Error(\"URL is required\");\r\n        }\r\n\r\n        if (!options.appId) {\r\n            throw new Error(\"App ID is required\");\r\n        }\r\n\r\n        this._url = options.url;\r\n        this._appId = options.appId;\r\n        this._encoder = options.encoder || new DefaultRapidEncoder();\r\n    }\r\n\r\n    /**\r\n     * Establishes a connection to RabbitMQ.\r\n     * If already connected, this method does nothing.\r\n     * @throws {Error} If the connection fails.\r\n     */\r\n    async connect(): Promise<void> {\r\n        if (this._isConnected) {\r\n            return;\r\n        }\r\n\r\n        try {\r\n            this._connection = await amqp.connect(this._url);\r\n            this._isConnected = true;\r\n        } catch (error) {\r\n            this._isConnected = false;\r\n            throw error;\r\n        }\r\n    }\r\n\r\n    /**\r\n     * Closes the RabbitMQ connection if it is open.\r\n     * If not connected, this method does nothing.\r\n     * @throws {Error} If closing the connection fails.\r\n     */\r\n    async disconnect(): Promise<void> {\r\n        if (!this._isConnected || !this._connection) {\r\n            return;\r\n        }\r\n\r\n        try {\r\n            await this._connection.close();\r\n            this._isConnected = false;\r\n            this._connection = null;\r\n        } catch (error) {\r\n            throw error;\r\n        }\r\n    }\r\n\r\n    /**\r\n     * Returns the active RabbitMQ connection.\r\n     * @throws {Error} If the connection is not established.\r\n     */\r\n    get connection(): amqp.ChannelModel {\r\n        if (!this._isConnected || !this._connection) {\r\n            throw new Error(\"Connection is not established\");\r\n        }\r\n        return this._connection;\r\n    }\r\n\r\n    /**\r\n     * Indicates whether the connector is currently connected to RabbitMQ.\r\n     */\r\n    get connected(): boolean {\r\n        return this._isConnected;\r\n    }\r\n\r\n    /**\r\n     * Returns the application ID associated with this connector.\r\n     */\r\n    get appId(): string {\r\n        return this._appId;\r\n    }\r\n\r\n    get encoder(): RapidEncoder {\r\n        return this._encoder;\r\n    }\r\n}","/**\r\n * RapidEncoder Interface and Default Implementation\r\n * Provides methods to encode and decode messages for network transmission.\r\n */\r\nexport interface RapidEncoder {\r\n    /**\r\n     * Encodes a message to be sent over the network.\r\n     * @param message - The message to encode.\r\n     * @return {Promise<Buffer>} - The encoded message as a Buffer.\r\n     */\r\n    encode(message: unknown, exchange: string, topic: string): Promise<Buffer>;\r\n    /**\r\n     * Decodes a message received from the network.\r\n     * @param data - The data to decode.\r\n     * @return {Promise<unknown>} - The decoded message.\r\n     */\r\n    decode(data: Buffer, exchange: string, topic: string): Promise<unknown>;\r\n}\r\n\r\n/**\r\n * DefaultRapidEncoder provides a basic implementation of RapidEncoder.\r\n * It encodes messages as JSON strings and decodes them back to their original form.\r\n */\r\nexport class DefaultRapidEncoder implements RapidEncoder {\r\n    async encode(message: unknown): Promise<Buffer> {\r\n        let type: string = typeof message;\r\n        let result;\r\n\r\n        if (type === 'object' && message instanceof Date) {\r\n            type = 'date';\r\n            message = message.getTime();\r\n        }\r\n\r\n        result = JSON.stringify([type, message]);\r\n        return Buffer.from(result, 'utf-8');\r\n    }\r\n\r\n    async decode(data: Buffer): Promise<unknown> {\r\n        const [type, message] = JSON.parse(data.toString('utf-8'));\r\n        switch (type) {\r\n            case 'date':\r\n                return new Date(message);\r\n            default:\r\n                return message;\r\n        }\r\n    }\r\n}","import { RapidConnector } from \"./rapid-connector\";\r\n\r\nexport interface MessagerOptions {\r\n    /** The RapidConnector instance to use for RabbitMQ connection */\r\n    connector: RapidConnector;\r\n\r\n    /** (Optional) Name of the exchange to use for messaging */\r\n    exchangeName?: string;\r\n\r\n    /** (Optional) Name of the queue to use for messaging */\r\n    durable?: boolean;\r\n\r\n    /** (Optional) Whether the queue should be durable */\r\n    exclusive?: boolean;\r\n}\r\n\r\nexport class Messager {\r\n    constructor(\r\n        protected _connector: RapidConnector,\r\n        protected _exchangeName: string,\r\n        protected _durable: boolean,\r\n        protected _exclusive: boolean,\r\n    ) {}\r\n\r\n    public get connector(): RapidConnector {\r\n        return this._connector;\r\n    }\r\n\r\n    public get exchangeName(): string {\r\n        return this._exchangeName;\r\n    }\r\n}","/**\r\n * PubSubMessager - Implements the publish/subscribe messaging pattern for RabbitMQ.\r\n * Part of the rapid-mq package.\r\n */\r\n\r\nimport * as amqp from 'amqplib';\r\n\r\nimport { Messager, MessagerOptions } from './messager';\r\n\r\n/**\r\n * Options for PubSubMessager.\r\n */\r\nexport interface PubSubMessagerOptions extends MessagerOptions {\r\n    /**\r\n     * Logical group for consumers.\r\n     */\r\n    appGroup: string;\r\n}\r\n\r\n/**\r\n * PubSubMessager - A class that implements the publish/subscribe messaging pattern using RabbitMQ.\r\n * It allows publishing messages to a topic and subscribing to messages from a topic.\r\n */\r\nexport class PubSubMessager extends Messager {\r\n    private _appGroup: string;\r\n    private _channel: amqp.Channel | null = null;\r\n\r\n    constructor(options: PubSubMessagerOptions) {\r\n        if (!options.connector) {\r\n            throw new Error(\"RapidConnector is required\");\r\n        }\r\n\r\n        if (!options.appGroup) {\r\n            throw new Error(\"App group is required\");\r\n        }\r\n\r\n        super(\r\n            options.connector,\r\n            options.exchangeName || 'pubsub-exchange',\r\n            options.durable ?? true,\r\n            options.exclusive ?? false,\r\n        );\r\n        this._appGroup = options.appGroup;\r\n    }\r\n\r\n    /**\r\n     * The logical group for consumers.\r\n     */\r\n    get appGroup(): string {\r\n        return this._appGroup;\r\n    }\r\n\r\n    /**\r\n     * Prepare the messager for use by establishing a connection and creating a channel.\r\n     * This method must be called before using the publish or subscribe methods.\r\n     * @throws {Error} If the connection is not established.\r\n     */\r\n    async initialize(): Promise<void> {\r\n        if (!this._connector.connected) {\r\n            await this._connector.connect();\r\n        }\r\n\r\n        this._channel = await this._connector.connection.createChannel();\r\n        if (!this._channel) {\r\n            throw new Error(\"Connection is not established\");\r\n        }\r\n\r\n        await this._channel.assertExchange(this._exchangeName, 'topic', { durable: this._durable });\r\n    }\r\n\r\n    /**\r\n     * Publish a message to a specific topic.\r\n     * @param topic - The topic to publish the message to.\r\n     * @param message - The message to publish. It can be any serializable object.\r\n     * @param ttl - Optional time-to-live for the message in milliseconds.\r\n     * @returns {boolean} - Returns true if the message was published successfully.\r\n     * @throws {Error} - Throws an error if the channel is not initialized or if publishing fails.\r\n     */\r\n    async publish(topic: string, message: unknown, ttl?: number): Promise<boolean> {\r\n        if (!this._channel) {\r\n            throw new Error(\"Channel is not initialized\");\r\n        }\r\n\r\n        const data = await this._connector.encoder.encode(message, this._exchangeName, topic);\r\n        return this._channel.publish(this._exchangeName, topic, data, { expiration: ttl });\r\n    }\r\n\r\n    /**\r\n     * Subscribe to a topic and process incoming messages with the provided callback.\r\n     * @param topic - The topic to subscribe to.\r\n     * @param callback - The function to call when a message is received.\r\n     * @returns {Promise<void>} - Resolves when the subscription is set up.\r\n     * @throws {Error} - Throws an error if the channel is not initialized.\r\n     */\r\n    async subscribe(topic: string, callback: (message: unknown) => void): Promise<void> {\r\n        if (!this._channel) {\r\n            throw new Error(\"Channel is not initialized\");\r\n        }\r\n\r\n        const queue = await this._channel.assertQueue(`${this._appGroup}.${topic}`, { durable: this._durable, exclusive: this._exclusive });\r\n        await this._channel.bindQueue(queue.queue, this._exchangeName, topic);\r\n        await this._channel.bindQueue(queue.queue, this._exchangeName, `${this._appGroup}.${topic}`);\r\n\r\n        this._channel.consume(queue.queue, async (msg) => {\r\n            try {\r\n                if (msg !== null) {\r\n                    const message = await this._connector.encoder.decode(msg.content, this._exchangeName, topic);\r\n                    await callback(message);\r\n                }\r\n            } catch (error) {\r\n                console.error(\"Error processing message:\", error);\r\n            }\r\n        }, { noAck: true });\r\n    }\r\n}","/**\r\n * RpcMessager - Implements the request/response (RPC) messaging pattern for RabbitMQ.\r\n * Allows sending RPC calls and serving RPC methods with automatic correlation and timeout handling.\r\n */\r\n\r\nimport * as crypto from 'crypto';\r\nimport { EventEmitter } from 'stream';\r\nimport * as amqp from 'amqplib';\r\n\r\nimport { Messager, MessagerOptions } from './messager';\r\n\r\n/**\r\n * Options for creating an RpcMessager instance.\r\n */\r\nexport interface RpcMessagerOptions extends MessagerOptions {\r\n    /** (Optional) Timeout in seconds for RPC calls. Defaults to 5 seconds. */\r\n    timeoutInSec?: number;\r\n    /** (Optional) EventEmitter instance for handling RPC responses. Defaults to a new EventEmitter. */\r\n    emitter?: EventEmitter;\r\n}\r\n\r\n/**\r\n * RpcMessager provides methods to make RPC calls and serve RPC endpoints using RabbitMQ.\r\n */\r\nexport class RpcMessager extends Messager {\r\n    private _timeout: number;\r\n    private _channel: amqp.Channel | null = null;\r\n    private _responseQueue: string = 'amq.rabbitmq.reply-to';\r\n    private _emitter:EventEmitter;\r\n\r\n    /**\r\n     * Constructs a new RpcMessager.\r\n     * @param options - Configuration options for the messager.\r\n     * @throws {Error} If connector is not provided.\r\n     */\r\n    constructor(options: RpcMessagerOptions) {\r\n        if (!options.connector) {\r\n            throw new Error(\"RapidConnector is required\");\r\n        }\r\n\r\n        super(\r\n            options.connector,\r\n            options.exchangeName || 'rpc-exchange',\r\n            options.durable ?? true,\r\n            options.exclusive ?? false,\r\n        );\r\n        this._timeout = (options.timeoutInSec || 5) * 1000;\r\n        this._emitter = options.emitter || new EventEmitter();\r\n    }\r\n\r\n    /**\r\n     * Initializes the RpcMessager by creating a channel, asserting the exchange,\r\n     * and setting up a consumer for the reply-to queue.\r\n     * @throws {Error} If the connection is not established.\r\n     */\r\n    async initialize(): Promise<void> {\r\n        if (!this._connector.connected) {\r\n            await this._connector.connect();\r\n        }\r\n\r\n        this._channel = await this._connector.connection.createChannel();\r\n        if (!this._channel) {\r\n            throw new Error(\"Connection is not established\");\r\n        }\r\n\r\n        await this._channel.assertExchange(this._exchangeName, 'direct', { durable: this._durable });\r\n\r\n        this._channel.consume(this._responseQueue, (result) => {\r\n            if (result && result.properties.correlationId) {\r\n                this._emitter.emit(\r\n                    `rpc:${result.properties.correlationId}`,\r\n                    result.content,\r\n                );\r\n            }\r\n        }, { noAck: true });\r\n    }\r\n\r\n    /**\r\n     * Makes an RPC call to a remote method.\r\n     * @param method - The name of the remote method (routing key).\r\n     * @param args - Arguments to pass to the remote method.\r\n     * @returns Promise<T> - Resolves with the response from the server.\r\n     * @throws {Error} If the channel is not initialized or if the call times out.\r\n     */\r\n    async call<T>(method: string, ...args: unknown[]): Promise<T> {\r\n        if (!this._channel) {\r\n            throw new Error(\"Channel is not initialized\");\r\n        }\r\n\r\n        return new Promise<T>(async (resolve, reject) => {\r\n            const requestId = crypto.randomUUID();\r\n            const data = await this._connector.encoder.encode(args, this._exchangeName, method);\r\n\r\n            const timeout = setTimeout(() => {\r\n                this._emitter.removeListener(`rpc:${requestId}`, responseHandler);\r\n                reject(new Error(`RPC call to ${method} timed out after ${this._timeout / 1000} seconds`));\r\n            }, this._timeout);\r\n\r\n            const responseHandler = async (result: Buffer) => {\r\n                clearTimeout(timeout);\r\n                if (result) {\r\n                    const data = await this._connector.encoder.decode(result, this._exchangeName, method);\r\n                    resolve(data as T);\r\n                }\r\n                else reject(new Error(`No response received for RPC call to ${method}`));\r\n            }\r\n\r\n            this._emitter.once(`rpc:${requestId}`, responseHandler);\r\n\r\n            this._channel!.publish(this._exchangeName, method, data, {\r\n                replyTo: this._responseQueue,\r\n                correlationId: requestId,\r\n                expiration: this._timeout,\r\n            });\r\n        });\r\n    }\r\n\r\n    /**\r\n     * Registers a server (handler) for an RPC method.\r\n     * @param method - The name of the method to serve (routing key).\r\n     * @param callback - The function to handle incoming RPC requests.\r\n     * @returns Promise<void>\r\n     * @throws {Error} If the channel is not initialized.\r\n     */\r\n    async server(method: string, callback: (...args: unknown[]) => Promise<unknown> | unknown): Promise<void> {\r\n        if (!this._channel) {\r\n            throw new Error(\"Channel is not initialized\");\r\n        }\r\n\r\n        const queue = await this._channel.assertQueue(method, { durable: this._durable, exclusive: this._exclusive });\r\n        await this._channel.bindQueue(queue.queue, this._exchangeName, method);\r\n\r\n        this._channel.consume(queue.queue, async (msg) => {\r\n            try {\r\n                if (msg !== null) {\r\n                    const args = await this._connector.encoder.decode(msg.content, this._exchangeName, method) as unknown[];\r\n                    const result = await callback(...args);\r\n\r\n                    if (msg.properties.replyTo && msg.properties.correlationId) {\r\n                        this._channel!.sendToQueue(\r\n                            msg.properties.replyTo,\r\n                            await this._connector.encoder.encode(result, this._exchangeName, method),\r\n                            { correlationId: msg.properties.correlationId },\r\n                        );\r\n                    }\r\n                }\r\n            } catch (error) {\r\n                console.error(`Error processing RPC call for method ${method}:`, error);\r\n            }\r\n        }, { noAck: true });\r\n    }\r\n}","/**\r\n * DirectMessager - A class for sending and receiving messages directly using RabbitMQ.\r\n * It allows sending messages to a specific consumer and listening for messages on a queue.\r\n */\r\n\r\nimport * as amqp from 'amqplib';\r\n\r\nimport { Messager, MessagerOptions } from './messager';\r\n\r\n/**\r\n * Options for DirectMessager.\r\n */\r\nexport interface DirectMessagerOptions extends MessagerOptions {\r\n    /** Unique consumer tag for identifying the consumer. */\r\n    consumerTag: string;\r\n}\r\n\r\n/**\r\n * DirectMessager - A class that implements direct messaging using RabbitMQ.\r\n * It allows sending messages to a specific consumer and listening for messages on a queue.\r\n */\r\nexport class DirectMessager extends Messager {\r\n    private _consumerTag: string;\r\n    private _channel: amqp.Channel | null = null;\r\n\r\n    constructor(options: DirectMessagerOptions) {\r\n        if (!options.connector) {\r\n            throw new Error(\"RapidConnector is required\");\r\n        }\r\n        \r\n        if (!options.consumerTag) {\r\n            throw new Error(\"Consumer tag is required\");\r\n        }\r\n        \r\n        super(\r\n            options.connector,\r\n            options.exchangeName || 'direct-exchange',\r\n            options.durable ?? true,\r\n            options.exclusive ?? false,\r\n        );\r\n\r\n        this._consumerTag = options.consumerTag;\r\n    }\r\n\r\n    /**\r\n     * The unique consumer tag for identifying the consumer.\r\n     */\r\n    get consumerTag(): string {\r\n        return this._consumerTag;\r\n    }\r\n\r\n    /**\r\n     * Prepare the messager for use by establishing a connection and creating a channel.\r\n     * This method must be called before using the publish or subscribe methods.\r\n     */\r\n    async initialize(): Promise<void> {\r\n        if (!this._connector.connected) {\r\n            await this._connector.connect();\r\n        }\r\n\r\n        this._channel = await this._connector.connection.createChannel();\r\n        if (!this._channel) {\r\n            throw new Error(\"Connection is not established\");\r\n        }\r\n\r\n        await this._channel.assertExchange(this._exchangeName, 'direct', { durable: this._durable });\r\n        const queue = await this._channel.assertQueue(`${this._consumerTag}.queue`, { durable: this._durable, exclusive: this._exclusive });\r\n        await this._channel.bindQueue(queue.queue, this._exchangeName, queue.queue);\r\n        await this._channel.bindQueue(queue.queue, this._exchangeName, this._consumerTag);\r\n    }\r\n\r\n    /**\r\n     * Send a message to a specific consumer.\r\n     * @param sendTo - The consumer tag or queue name to send the message to.\r\n     * @param message - The message to send.\r\n     * @param ttl - Optional time-to-live for the message in milliseconds.\r\n     * @returns {boolean} - A boolean true if the message was sent successfully, false otherwise.\r\n     * @throws {Error} - Throws an error if the channel is not initialized or if publishing fails.\r\n     */\r\n    async send(sendTo: string, message: unknown, ttl?: number): Promise<boolean> {\r\n        if (!this._channel) {\r\n            throw new Error(\"Channel is not initialized\");\r\n        }\r\n\r\n        const data = await this._connector.encoder.encode(message, this._exchangeName, sendTo);\r\n        return this._channel.publish(this._exchangeName, sendTo, data, { expiration: ttl });\r\n    }\r\n\r\n    /**\r\n     * Listen for messages on the consumer tag.\r\n     * @param callback - A callback function that will be called with the received message.\r\n     * @returns {Promise<void>} - A promise that resolves when the listener is set up.\r\n     * @throws {Error} - Throws an error if the channel is not initialized.\r\n     */\r\n    async listen(callback: (message: unknown) => void): Promise<void> {\r\n        if (!this._channel) {\r\n            throw new Error(\"Channel is not initialized\");\r\n        }\r\n\r\n        await this._channel.consume(`${this._consumerTag}.queue`, async (msg) => {\r\n            try {\r\n                if (msg && msg.content) {\r\n                    const message = await this._connector.encoder.decode(msg.content, this._exchangeName, this._consumerTag);\r\n                    await callback(message);\r\n                }\r\n            } catch (error) {\r\n                console.error(\"Error processing message:\", error);\r\n            }\r\n        }, { noAck: true });\r\n    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