@rxap/nest-amqp
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@rxap/nest-amqp
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RmqExchangeOptions</li>
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<code>src/lib/client-rmq-exchange.ts</code>
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<h6><b>Properties</b></h6>
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<code>options: <code><a href="../interfaces/ExchangeRmqOptions.html" target="_self" >ExchangeRmqOptions</a></code>
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<i>Type : </i> <code><a href="../interfaces/ExchangeRmqOptions.html" target="_self" >ExchangeRmqOptions</a></code>
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<pre class="line-numbers compodoc-sourcecode"><code class="language-typescript">import { Logger } from '@nestjs/common/services/logger.service';
import { randomStringGenerator } from '@nestjs/common/utils/random-string-generator.util';
import { isFunction } from '@nestjs/common/utils/shared.utils';
import {
ClientProxy,
ReadPacket,
RmqRecord,
WritePacket,
} from '@nestjs/microservices';
import {
CONNECT_EVENT,
CONNECT_FAILED_EVENT,
DISCONNECT_EVENT,
DISCONNECTED_RMQ_MESSAGE,
ERROR_EVENT,
RQM_DEFAULT_NOACK,
} from '@nestjs/microservices/constants';
import { RmqRecordSerializer } from '@nestjs/microservices/serializers';
import { ExchangeRmqOptions } from './options';
import {
AmqpConnectionManager,
ChannelWrapper,
connect,
} from 'amqp-connection-manager';
import {
Channel,
Connection,
ConsumeMessage,
Options,
} from 'amqplib';
import { EventEmitter } from 'events';
import {
firstValueFrom,
fromEvent,
merge,
Observable,
ReplaySubject,
tap,
} from 'rxjs';
import {
first,
map,
retryWhen,
scan,
skip,
} from 'rxjs/operators';
import { IncomingResponseDeserializer } from './incoming-response.deserializer';
export const REPLY_QUEUE = 'amq.rabbitmq.reply-to';
export interface RmqExchangeOptions {
options?: ExchangeRmqOptions;
}
export class ClientRMQExchange extends ClientProxy {
protected connection$!: ReplaySubject<Connection>;
protected client: AmqpConnectionManager | null = null;
protected channel: ChannelWrapper | null = null;
protected responseEmitter!: EventEmitter;
constructor(
protected readonly options: ExchangeRmqOptions,
protected readonly logger = new Logger(ClientProxy.name),
) {
super();
this.initializeSerializer(options);
this.initializeDeserializer(options);
}
public isConnected() {
return this.client && this.client.isConnected();
}
public close(): void {
this.channel && this.channel.close();
this.client && this.client.close();
this.channel = null;
this.client = null;
}
public connect(): Promise<Connection> {
if (this.client) {
return this.convertConnectionToPromise();
}
this.client = this.createClient();
this.handleError(this.client);
this.handleDisconnectError(this.client);
this.responseEmitter = new EventEmitter();
this.responseEmitter.setMaxListeners(0);
const connect$ = this.connect$(this.client);
const withDisconnect$ = this.mergeDisconnectEvent(
this.client,
connect$,
).pipe(
tap(() => this.createChannel()),
);
const withReconnect$ = fromEvent(this.client, CONNECT_EVENT).pipe(
skip(1),
);
const source$: Observable<{ url: string, connection: Connection }> = merge(withDisconnect$, withReconnect$);
this.connection$ = new ReplaySubject(1);
source$.subscribe({
next: data => {
this.connection$.next(data.connection);
},
});
return this.convertConnectionToPromise();
}
public createChannel(): Promise<void> {
return new Promise(resolve => {
this.channel = this.client!.createChannel({
json: false,
setup: (channel: Channel) => this.setupExchange(channel, resolve),
});
});
}
public createClient(): AmqpConnectionManager {
const socketOptions = this.getOptionsProp(this.options, 'socketOptions');
return connect(this.options.urls, socketOptions);
}
public mergeDisconnectEvent<T = any>(
instance: any,
source$: Observable<T>,
): Observable<T> {
const eventToError = (eventType: string) =>
fromEvent(instance, eventType).pipe(
map((err: unknown) => {
throw err;
}),
);
const disconnect$ = eventToError(DISCONNECT_EVENT);
const urls = this.getOptionsProp(this.options, 'urls', []) ?? [];
const connectFailed$ = eventToError(CONNECT_FAILED_EVENT).pipe(
retryWhen(e =>
e.pipe(
scan((errorCount, error: any) => {
if (urls.indexOf(error.url) >= urls.length - 1) {
throw error;
}
return errorCount + 1;
}, 0),
),
),
);
// If we ever decide to propagate all disconnect errors & re-emit them through
// the "connection" stream then comment out "first()" operator.
return merge(source$, disconnect$, connectFailed$).pipe(first());
}
public async convertConnectionToPromise() {
// try {
return await firstValueFrom(this.connection$);
// } catch (err) {
// if (err instanceof EmptyError) {
// return;
// }
// throw err;
// }
}
public async setupExchange(channel: Channel, resolve: () => unknown) {
this.logger.verbose(`Setting up exchange '${ this.options.exchange.name }'`, 'ClientRMQExchange');
if (!this.options.noAssert) {
await channel.assertExchange(
this.options.exchange.name, this.options.exchange.type, this.options.exchange.options);
}
await this.consumeChannel(channel);
resolve();
}
public async consumeChannel(channel: Channel) {
const noAck = this.getOptionsProp(this.options, 'noAck', RQM_DEFAULT_NOACK);
await channel.consume(
this.options.replyQueue ?? REPLY_QUEUE,
(msg: ConsumeMessage | null) => {
if (msg) {
this.responseEmitter.emit(msg.properties.correlationId, msg);
} else {
this.logger.warn(`Message is empty from RMQ queue ${ this.options.replyQueue ?? REPLY_QUEUE }`);
}
},
{
noAck,
},
);
}
public handleError(client: AmqpConnectionManager): void {
client.addListener(ERROR_EVENT, (err: any) => this.logger.error(err));
}
public handleDisconnectError(client: AmqpConnectionManager): void {
client.addListener(DISCONNECT_EVENT, (err: any) => {
this.logger.error(DISCONNECTED_RMQ_MESSAGE);
this.logger.error(err);
});
}
public async handleMessage(
packet: unknown,
callback: (packet: WritePacket) => any,
): Promise<void>;
public async handleMessage(
packet: unknown,
options: Record<string, unknown>,
callback: (packet: WritePacket) => any,
): Promise<void>;
public async handleMessage(
packet: unknown,
optionsOrCallback: Record<string, unknown> | ((packet: WritePacket) => any),
callback?: (packet: WritePacket) => any,
): Promise<void> {
this.logger.verbose('Received message: %JSON', packet, 'ClientRMQExchange');
let options: Record<string, unknown> | undefined = undefined;
if (isFunction(options)) {
callback = options as (packet: WritePacket) => any;
} else {
options = optionsOrCallback as Record<string, unknown>;
}
if (!callback) {
throw new Error('No callback provided');
}
const {
err,
response,
isDisposed,
} = await this.deserializer.deserialize(
packet,
options,
);
this.logger.verbose('Deserialized response: %JSON', response, 'ClientRMQExchange');
if (err) {
this.logger.verbose('Deserialized error: %JSON', err, 'ClientRMQExchange');
}
this.logger.verbose('Deserialized isDisposed: %JSON', isDisposed, 'ClientRMQExchange');
if (isDisposed || err) {
callback({
err,
response,
isDisposed: true,
});
}
callback({
err,
response,
});
}
protected publish(
message: ReadPacket,
callback: (packet: WritePacket) => any,
): () => void {
this.logger.verbose('Publishing message: %JSON', message, 'ClientRMQExchange');
try {
const correlationId = randomStringGenerator();
const listener = ({
content,
fields,
properties,
}: ConsumeMessage) => this.handleMessage(
this.parseMessageContent(content),
{
fields,
properties,
},
callback,
);
Object.assign(message, { id: correlationId });
const serializedPacket: ReadPacket & Partial<RmqRecord> =
this.serializer.serialize(message);
const options = serializedPacket.options;
delete serializedPacket.options;
this.responseEmitter.on(correlationId, listener);
this.channel!
.publish(
this.options.exchange.name,
serializedPacket.pattern,
Buffer.from(JSON.stringify(serializedPacket.data)),
{
replyTo: this.options.replyQueue ?? REPLY_QUEUE,
persistent: this.options.persistent,
...options,
headers: this.mergeHeaders(options?.headers),
correlationId,
} as Options.Publish,
)
.catch(err => callback({ err }));
return () => this.responseEmitter.removeListener(correlationId, listener);
} catch (err) {
callback({ err });
}
return () => void 0;
}
protected dispatchEvent(packet: ReadPacket): Promise<any> {
this.logger.verbose('Dispatching event: %JSON', packet, 'ClientRMQExchange');
const serializedPacket: ReadPacket & Partial<RmqRecord> =
this.serializer.serialize(packet);
const options = serializedPacket.options;
delete serializedPacket.options;
return new Promise<void>((resolve, reject) =>
this.channel!.publish(
this.options.exchange.name,
serializedPacket.pattern,
Buffer.from(JSON.stringify(serializedPacket.data)),
{
persistent: this.options.persistent,
...options,
headers: this.mergeHeaders(options?.headers),
} as Options.Publish,
(err: unknown) => (
err ? reject(err) : resolve()
),
),
);
}
protected override initializeSerializer(options: ExchangeRmqOptions) {
this.serializer = options.serializer ?? new RmqRecordSerializer();
}
protected override initializeDeserializer(options: ExchangeRmqOptions) {
this.deserializer = options.deserializer ?? new IncomingResponseDeserializer();
}
protected mergeHeaders(
requestHeaders?: Record<string, string>,
): Record<string, string> | undefined {
if (!requestHeaders && !this.options?.headers) {
return undefined;
}
return {
...this.options?.headers,
...requestHeaders,
};
}
protected parseMessageContent(content: Buffer) {
const rawContent = content.toString();
try {
return JSON.parse(rawContent);
} catch {
return rawContent;
}
}
}
</code></pre>
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