Adds filtering feature on publishing side

src/client.ts

@@ -4,7 +4,7 @@ import { Compression, CompressionType, GzipCompression, NoneCompression } from "
 import { Consumer, ConsumerFunc, StreamConsumer } from "./consumer"
 import { STREAM_ALREADY_EXISTS_ERROR_CODE } from "./error_codes"
 import { Logger, NullLogger } from "./logger"
-import { Message, Publisher, StreamPublisher } from "./publisher"
+import { FilterFunc, Message, Publisher, StreamPublisher } from "./publisher"
 import { ConsumerUpdateResponse } from "./requests/consumer_update_response"
 import { CreateStreamArguments, CreateStreamRequest } from "./requests/create_stream_request"
 import { CreditRequest, CreditRequestParams } from "./requests/credit_request"
@@ -41,6 +41,7 @@ import { DeleteSuperStreamRequest } from "./requests/delete_super_stream_request
 import { lt, coerce } from "semver"
 import { ConnectionInfo, Connection, errorMessageOf } from "./connection"
 import { ConnectionPool } from "./connection_pool"
+import { DeliverResponseV2 } from "./responses/deliver_response_v2"
 
 export type ConnectionClosedListener = (hadError: boolean) => void
 
@@ -125,7 +126,7 @@ export class Client {
     return res.streams
   }
 
-  public async declarePublisher(params: DeclarePublisherParams): Promise<Publisher> {
+  public async declarePublisher(params: DeclarePublisherParams, filter?: FilterFunc): Promise<Publisher> {
     const { stream, publisherRef } = params
     const publisherId = this.incPublisherId()
 
@@ -137,16 +138,23 @@ export class Client {
       await connection.close()
       throw new Error(`Declare Publisher command returned error with code ${res.code} - ${errorMessageOf(res.code)}`)
     }
-    const publisher = new StreamPublisher({
-      connection: connection,
-      stream: params.stream,
-      publisherId: publisherId,
-      publisherRef: params.publisherRef,
-      boot: params.boot,
-      maxFrameSize: this.maxFrameSize,
-      maxChunkLength: params.maxChunkLength,
-      logger: this.logger,
-    })
+    if (filter && !connection.isFilteringEnabled) {
+      await connection.close()
+      throw new Error(`Broker does not support message filtering.`)
+    }
+    const publisher = new StreamPublisher(
+      {
+        connection: connection,
+        stream: params.stream,
+        publisherId: publisherId,
+        publisherRef: params.publisherRef,
+        boot: params.boot,
+        maxFrameSize: this.maxFrameSize,
+        maxChunkLength: params.maxChunkLength,
+        logger: this.logger,
+      },
+      filter
+    )
     this.publishers.set(publisherId, { publisher: publisher, connection: connection })
     this.logger.info(
       `New publisher created with stream name ${params.stream}, publisher id ${publisherId} and publisher reference ${params.publisherRef}`
@@ -410,14 +418,28 @@ export class Client {
     return consumerId
   }
 
-  private getDeliverCallback() {
+  private getDeliverV1Callback() {
     return async (response: DeliverResponse) => {
       const consumer = this.consumers.get(response.subscriptionId)
       if (!consumer) {
-        this.logger.error(`On deliver no consumer found`)
+        this.logger.error(`On deliverV1 no consumer found`)
+        return
+      }
+      this.logger.debug(`on deliverV1 -> ${consumer.consumerRef}`)
+      this.logger.debug(`response.messages.length: ${response.messages.length}`)
+      await this.askForCredit({ credit: 1, subscriptionId: response.subscriptionId })
+      response.messages.map((x) => consumer.handle(x))
+    }
+  }
+
+  private getDeliverV2Callback() {
+    return async (response: DeliverResponseV2) => {
+      const consumer = this.consumers.get(response.subscriptionId)
+      if (!consumer) {
+        this.logger.error(`On deliverV2 no consumer found`)
         return
       }
-      this.logger.debug(`on deliver -> ${consumer.consumerRef}`)
+      this.logger.debug(`on deliverV2 -> ${consumer.consumerRef}`)
       this.logger.debug(`response.messages.length: ${response.messages.length}`)
       await this.askForCredit({ credit: 1, subscriptionId: response.subscriptionId })
       response.messages.map((x) => consumer.handle(x))
@@ -493,7 +515,8 @@ export class Client {
     const connectionListeners = {
       ...this.params.listeners,
       connection_closed: connectionClosedListener,
-      deliver: this.getDeliverCallback(),
+      deliverV1: this.getDeliverV1Callback(),
+      deliverV2: this.getDeliverV2Callback(),
       consumer_update_query: this.getConsumerUpdateCallback(),
     }
     return { ...this.params, listeners: connectionListeners, leader: leader, streamName: streamName }

src/connection.ts

@@ -16,6 +16,7 @@ import { TuneRequest } from "./requests/tune_request"
 import {
   ConsumerUpdateQueryListener,
   DeliverListener,
+  DeliverV2Listener,
   MetadataUpdateListener,
   PublishConfirmListener,
   PublishErrorListener,
@@ -29,7 +30,7 @@ import { Response } from "./responses/response"
 import { SaslAuthenticateResponse } from "./responses/sasl_authenticate_response"
 import { SaslHandshakeResponse } from "./responses/sasl_handshake_response"
 import { TuneResponse } from "./responses/tune_response"
-import { DEFAULT_FRAME_MAX, DEFAULT_UNLIMITED_FRAME_MAX, removeFrom } from "./util"
+import { DEFAULT_FRAME_MAX, DEFAULT_UNLIMITED_FRAME_MAX, REQUIRED_MANAGEMENT_VERSION, removeFrom } from "./util"
 import { Version, checkServerDeclaredVersions, getClientSupportedVersions } from "./versions"
 import { WaitingResponse } from "./waiting_response"
 import { ClientListenersParams, ClientParams, ClosingParams, QueryOffsetParams, StoreOffsetParams } from "./client"
@@ -38,11 +39,13 @@ import { QueryPublisherRequest } from "./requests/query_publisher_request"
 import { StoreOffsetRequest } from "./requests/store_offset_request"
 import { QueryOffsetResponse } from "./responses/query_offset_response"
 import { QueryOffsetRequest } from "./requests/query_offset_request"
+import { coerce, lt } from "semver"
 
 export type ConnectionClosedListener = (hadError: boolean) => void
 
 export type ConnectionProxyListenersParams = ClientListenersParams & {
-  deliver?: DeliverListener
+  deliverV1?: DeliverListener
+  deliverV2?: DeliverV2Listener
   consumer_update_query?: ConsumerUpdateQueryListener
 }
 
@@ -82,6 +85,7 @@ export class Connection {
   private serverEndpoint: { host: string; port: number } = { host: "", port: 5552 }
   private readonly serverDeclaredVersions: Version[] = []
   private refs: number = 0
+  private filteringEnabled: boolean = false
 
   constructor(private readonly params: ConnectionProxyParams, private readonly logger: Logger) {
     this.hostname = params.hostname
@@ -125,6 +129,7 @@ export class Connection {
       this.socket.on("connect", async () => {
         this.logger.info(`Connected to RabbitMQ ${this.params.hostname}:${this.params.port}`)
         this.peerProperties = (await this.exchangeProperties()).properties
+        this.filteringEnabled = lt(coerce(this.rabbitManagementVersion)!, REQUIRED_MANAGEMENT_VERSION) ? false : true
         await this.auth({ username: this.params.username, password: this.params.password })
         const { heartbeat } = await this.tune(this.params.heartbeat ?? 0)
         await this.open({ virtualHost: this.params.vhost })
@@ -151,15 +156,23 @@ export class Connection {
   public on(event: "metadata_update", listener: MetadataUpdateListener): void
   public on(event: "publish_confirm", listener: PublishConfirmListener): void
   public on(event: "publish_error", listener: PublishErrorListener): void
-  public on(event: "deliver", listener: DeliverListener): void
+  public on(event: "deliverV1", listener: DeliverListener): void
+  public on(event: "deliverV2", listener: DeliverV2Listener): void
   public on(event: "consumer_update_query", listener: ConsumerUpdateQueryListener): void
   public on(
-    event: "metadata_update" | "publish_confirm" | "publish_error" | "deliver" | "consumer_update_query",
+    event:
+      | "metadata_update"
+      | "publish_confirm"
+      | "publish_error"
+      | "deliverV1"
+      | "deliverV2"
+      | "consumer_update_query",
     listener:
       | MetadataUpdateListener
       | PublishConfirmListener
       | PublishErrorListener
       | DeliverListener
+      | DeliverV2Listener
       | ConsumerUpdateQueryListener
   ) {
     switch (event) {
@@ -172,8 +185,11 @@ export class Connection {
       case "publish_error":
         this.decoder.on("publish_error", listener as PublishErrorListener)
         break
-      case "deliver":
-        this.decoder.on("deliver", listener as DeliverListener)
+      case "deliverV1":
+        this.decoder.on("deliverV1", listener as DeliverListener)
+        break
+      case "deliverV2":
+        this.decoder.on("deliverV2", listener as DeliverV2Listener)
         break
       case "consumer_update_query":
         this.decoder.on("consumer_update_query", listener as ConsumerUpdateQueryListener)
@@ -187,7 +203,8 @@ export class Connection {
     if (listeners?.metadata_update) this.decoder.on("metadata_update", listeners.metadata_update)
     if (listeners?.publish_confirm) this.decoder.on("publish_confirm", listeners.publish_confirm)
     if (listeners?.publish_error) this.decoder.on("publish_error", listeners.publish_error)
-    if (listeners?.deliver) this.decoder.on("deliver", listeners.deliver)
+    if (listeners?.deliverV1) this.decoder.on("deliverV1", listeners.deliverV1)
+    if (listeners?.deliverV2) this.decoder.on("deliverV2", listeners.deliverV2)
     if (listeners?.consumer_update_query) this.decoder.on("consumer_update_query", listeners.consumer_update_query)
   }
 
@@ -332,6 +349,10 @@ export class Connection {
     return this.peerProperties.version
   }
 
+  public get isFilteringEnabled() {
+    return this.filteringEnabled
+  }
+
   private async auth(params: { username: string; password: string }) {
     this.logger.debug(`Start authentication process ...`)
     this.logger.debug(`Start SASL handshake ...`)

src/publisher.ts

@@ -11,6 +11,7 @@ import { DEFAULT_UNLIMITED_FRAME_MAX } from "./util"
 import { MetadataUpdateListener } from "./response_decoder"
 import { ConnectionInfo, Connection } from "./connection"
 import { ConnectionPool } from "./connection_pool"
+import { PublishRequestV2 } from "./requests/publish_request_v2"
 
 export type MessageApplicationProperties = Record<string, string | number>
 
@@ -70,6 +71,7 @@ export interface Publisher {
   readonly publisherId: number
 }
 
+export type FilterFunc = (msg: Message) => string | undefined
 type PublishConfirmCallback = (err: number | null, publishingIds: bigint[]) => void
 export class StreamPublisher implements Publisher {
   private connection: Connection
@@ -85,16 +87,19 @@ export class StreamPublisher implements Publisher {
   private maxChunkLength: number
   private closed = false
 
-  constructor(params: {
-    connection: Connection
-    stream: string
-    publisherId: number
-    publisherRef?: string
-    boot?: boolean
-    maxFrameSize: number
-    maxChunkLength?: number
-    logger: Logger
-  }) {
+  constructor(
+    params: {
+      connection: Connection
+      stream: string
+      publisherId: number
+      publisherRef?: string
+      boot?: boolean
+      maxFrameSize: number
+      maxChunkLength?: number
+      logger: Logger
+    },
+    private readonly filter?: FilterFunc
+  ) {
     this.connection = params.connection
     this.stream = params.stream
     this.publisherId = params.publisherId
@@ -187,6 +192,12 @@ export class StreamPublisher implements Publisher {
   }
 
   private async enqueue(publishRequestMessage: PublishRequestMessage) {
+    if (this.filter) {
+      publishRequestMessage.filterValue = this.filter(publishRequestMessage.message)
+    }
+    if (!this.connection.isFilteringEnabled && this.filter) {
+      throw new Error(`Your rabbit server management version does not support filtering.`)
+    }
     this.checkMessageSize(publishRequestMessage)
     const sendCycleNeeded = this.add(publishRequestMessage)
     let sent = false
@@ -211,12 +222,19 @@ export class StreamPublisher implements Publisher {
   private async sendBuffer() {
     const chunk = this.popChunk()
     if (chunk.length > 0) {
-      await this.connection.send(
-        new PublishRequest({
-          publisherId: this.publisherId,
-          messages: chunk,
-        })
-      )
+      this.filter
+        ? await this.connection.send(
+            new PublishRequestV2({
+              publisherId: this.publisherId,
+              messages: chunk,
+            })
+          )
+        : await this.connection.send(
+            new PublishRequest({
+              publisherId: this.publisherId,
+              messages: chunk,
+            })
+          )
     }
   }
 

src/requests/abstract_request.ts

@@ -44,6 +44,12 @@ export class BufferDataWriter implements DataWriter {
     this._offset = this.buffer.writeInt8(data, this._offset)
   }
 
+  writeInt16(data: number) {
+    const bytes = 2
+    this.growIfNeeded(bytes)
+    this._offset = this.buffer.writeInt16BE(data, this._offset)
+  }
+
   writeUInt8(data: number): void {
     const bytes = 1
     this.growIfNeeded(bytes)
@@ -113,7 +119,9 @@ export class BufferDataWriter implements DataWriter {
 export abstract class AbstractRequest implements Request {
   abstract get key(): number
   abstract get responseKey(): number
-  readonly version = 1
+  get version() {
+    return 1
+  }
 
   toBuffer(bufferSizeParams?: BufferSizeParams, correlationId?: number): Buffer {
     const initialSize = bufferSizeParams?.initialSize ?? 65536