7 as a library user i want to create a consumer so i can consume messages

src/connection.ts

@@ -3,17 +3,21 @@ import { AmqpManagement, Management } from "./management.js"
 import { EnvironmentParams } from "./environment.js"
 import { AmqpPublisher, Publisher } from "./publisher.js"
 import { DestinationOptions } from "./message.js"
+import { AmqpConsumer, Consumer, CreateConsumerParams } from "./consumer.js"
 
 export interface Connection {
   close(): Promise<boolean>
   isOpen(): boolean
   management(): Management
   createPublisher(options?: DestinationOptions): Promise<Publisher>
   get publishers(): Map<string, Publisher>
+  get consumers(): Map<string, Consumer>
+  createConsumer(queueName: string, params: CreateConsumerParams): Promise<Consumer>
 }
 
 export class AmqpConnection implements Connection {
   private _publishers: Map<string, Publisher> = new Map<string, Publisher>()
+  private _consumers: Map<string, Consumer> = new Map<string, Consumer>()
 
   static async create(params: EnvironmentParams) {
     const connection = await AmqpConnection.open(params)
@@ -50,10 +54,17 @@ export class AmqpConnection implements Connection {
       })
 
       this._publishers.forEach((p) => p.close())
+      this._consumers.forEach((p) => p.close())
       this.connection.close()
     })
   }
 
+  async createConsumer(queueName: string, params: CreateConsumerParams): Promise<Consumer> {
+    const consumer = await AmqpConsumer.createFrom(this.connection, this._consumers, queueName, params)
+    this._consumers.set(consumer.id, consumer)
+    return consumer
+  }
+
   management(): Management {
     return this.topologyManagement
   }
@@ -68,6 +79,10 @@ export class AmqpConnection implements Connection {
     return this._publishers
   }
 
+  public get consumers(): Map<string, Consumer> {
+    return this._consumers
+  }
+
   public isOpen(): boolean {
     return this.connection ? this.connection.is_open() : false
   }

src/consumer.ts

@@ -0,0 +1,102 @@
+import {
+  generate_uuid,
+  Receiver,
+  ReceiverEvents,
+  ReceiverOptions,
+  Connection,
+  SenderOptions,
+  EventContext,
+  Message,
+} from "rhea"
+import { openLink } from "./utils.js"
+import { createAddressFrom } from "./message.js"
+
+export type ConsumerMessageHandler = (message: Message) => void
+
+export type CreateConsumerParams = {
+  messageHandler: ConsumerMessageHandler
+}
+
+const getConsumerReceiverLinkConfigurationFrom = (
+  address: string,
+  consumerId: string
+): SenderOptions | ReceiverOptions => ({
+  snd_settle_mode: 0,
+  rcv_settle_mode: 0,
+  name: consumerId,
+  target: { address, expiry_policy: "SESSION_END", durable: 0, dynamic: false },
+  source: {
+    address,
+    expiry_policy: "LINK_DETACH",
+    timeout: 0,
+    dynamic: false,
+    durable: 0,
+  },
+})
+
+export interface Consumer {
+  start(): void
+  close(): void
+  get id(): string
+}
+
+export class AmqpConsumer implements Consumer {
+  static async createFrom(
+    connection: Connection,
+    consumersList: Map<string, Consumer>,
+    queueName: string,
+    params: CreateConsumerParams
+  ) {
+    const id = generate_uuid()
+    const address = createAddressFrom({ queue: { name: queueName } })
+    const receiverLink = await AmqpConsumer.openReceiver(connection, address, id)
+    return new AmqpConsumer(id, connection, consumersList, receiverLink, params)
+  }
+
+  private static async openReceiver(connection: Connection, address: string, consumerId: string): Promise<Receiver> {
+    return openLink<Receiver>(
+      connection,
+      ReceiverEvents.receiverOpen,
+      ReceiverEvents.receiverError,
+      connection.open_receiver.bind(connection),
+      getConsumerReceiverLinkConfigurationFrom(address, consumerId)
+    )
+  }
+
+  constructor(
+    private readonly _id: string,
+    private readonly connection: Connection,
+    private readonly consumersList: Map<string, Consumer>,
+    private readonly receiverLink: Receiver,
+    private readonly params: CreateConsumerParams
+  ) {
+    console.log(this.connection.container_id)
+  }
+
+  get id() {
+    return this._id
+  }
+
+  start() {
+    this.receiverLink.on(ReceiverEvents.message, (context: EventContext) => {
+      console.log("message received", context.message?.body)
+      if (context.message && context.delivery) {
+        console.log("message accepted")
+        try {
+          this.params.messageHandler(context.message)
+          context.delivery.accept()
+          console.log("message consumed")
+        } catch (e) {
+          context.delivery.reject({ condition: "Message Handler error", info: e })
+          console.log("message rejected")
+        }
+      }
+    })
+  }
+
+  close() {
+    this.receiverLink.removeAllListeners()
+    if (this.receiverLink.is_open()) this.receiverLink.close()
+    if (this.consumersList.has(this._id)) this.consumersList.delete(this._id)
+  }
+}

src/index.ts

@@ -2,4 +2,5 @@ export { Management, AmqpManagement } from "./management.js"
 export { Environment, AmqpEnvironment } from "./environment.js"
 export { Connection, AmqpConnection } from "./connection.js"
 export { Publisher, AmqpPublisher } from "./publisher.js"
+export { Consumer, AmqpConsumer } from "./consumer.js"
 export { createAmqpMessage } from "./message.js"

test/e2e/connection.test.ts

@@ -106,4 +106,39 @@ describe("Connection", () => {
 
     expect(newConnection.publishers.size).eql(0)
   })
+
+  test("create a consumer linked to a queue", async () => {
+    await connection.createConsumer(queueName, {
+      messageHandler: async (msg) => {
+        console.log(msg)
+      },
+    })
+
+    expect(connection.consumers.size).eql(1)
+  })
+
+  test("close a consumer", async () => {
+    const consumer = await connection.createConsumer(queueName, {
+      messageHandler: async (msg) => {
+        console.log(msg)
+      },
+    })
+
+    consumer.close()
+
+    expect(connection.consumers.size).eql(0)
+  })
+
+  test("closing the connection also closes the consumer", async () => {
+    const newConnection = await environment.createConnection()
+    await newConnection.createConsumer(queueName, {
+      messageHandler: async (msg) => {
+        console.log(msg)
+      },
+    })
+
+    await newConnection.close()
+
+    expect(newConnection.consumers.size).eql(0)
+  })
 })

test/e2e/consumer.test.ts

@@ -0,0 +1,107 @@
+import { Management } from "../../src/index.js"
+import { afterEach, beforeEach, describe, expect, test } from "vitest"
+import { eventually, host, password, port, username, cleanRabbit } from "../support/util.js"
+import { createEnvironment, Environment } from "../../src/environment.js"
+import { Connection } from "../../src/connection.js"
+import { Queue } from "../../src/queue.js"
+import { Exchange } from "../../src/exchange.js"
+import { createAmqpMessage } from "../../src/message.js"
+
+describe("Consumer", () => {
+  let environment: Environment
+  let connection: Connection
+  let management: Management
+  let queue: Queue
+  let exchange: Exchange
+
+  const exchangeName = "test-exchange"
+  const queueName = "test-queue"
+  const bindingKey = "test-binding"
+
+  beforeEach(async () => {
+    environment = createEnvironment({
+      host,
+      port,
+      username,
+      password,
+    })
+    connection = await environment.createConnection()
+    management = connection.management()
+    queue = await management.declareQueue(queueName)
+    exchange = await management.declareExchange(exchangeName)
+    await management.bind(bindingKey, { source: exchange, destination: queue })
+  })
+
+  afterEach(async () => {
+    try {
+      await cleanRabbit({ match: /test-/ })
+      await connection.close()
+      await environment.close()
+    } catch (error) {
+      console.error(error)
+    }
+  })
+
+  test("consumer can handle message on exchange", async () => {
+    const publisher = await connection.createPublisher({ exchange: { name: exchangeName, routingKey: bindingKey } })
+    const expectedBody = "ciao"
+    await publisher.publish(createAmqpMessage({ body: expectedBody }))
+    let received: string = ""
+
+    const consumer = await connection.createConsumer(queueName, {
+      messageHandler: (message) => {
+        received = message.body
+      },
+    })
+    consumer.start()
+
+    await eventually(() => {
+      expect(received).to.be.eql(expectedBody)
+    })
+  })
+
+  test.skip("consumer can handle message on exchange, destination on message", async () => {
+    const publisher = await connection.createPublisher()
+    const expectedBody = "ciao"
+    await publisher.publish(
+      createAmqpMessage({
+        body: expectedBody,
+        destination: { exchange: { name: exchangeName, routingKey: bindingKey } },
+      })
+    )
+    let received: string = ""
+
+    const consumer = await connection.createConsumer(queueName, {
+      messageHandler: (message) => {
+        received = message.body
+      },
+    })
+    consumer.start()
+
+    await eventually(() => {
+      expect(received).to.be.eql(expectedBody)
+    })
+  })
+
+  test("consumer can handle message on queue", async () => {
+    const publisher = await connection.createPublisher({ queue: { name: queueName } })
+    const expectedBody = "ciao"
+    await publisher.publish(
+      createAmqpMessage({
+        body: expectedBody,
+      })
+    )
+    let received: string = ""
+
+    const consumer = await connection.createConsumer(queueName, {
+      messageHandler: (message) => {
+        received = message.body
+      },
+    })
+    consumer.start()
+
+    await eventually(() => {
+      expect(received).to.be.eql(expectedBody)
+    })
+  })
+})