@nestjstools/messaging-nats-extension
Version:
Extension to handle messages and dispatch them over Nats
85 lines • 4.44 kB
JavaScript
;
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
if (typeof Reflect === "object" && typeof Reflect.decorate === "function") r = Reflect.decorate(decorators, target, key, desc);
else for (var i = decorators.length - 1; i >= 0; i--) if (d = decorators[i]) r = (c < 3 ? d(r) : c > 3 ? d(target, key, r) : d(target, key)) || r;
return c > 3 && r && Object.defineProperty(target, key, r), r;
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.NatsJetStreamMessagingConsumer = void 0;
const messaging_1 = require("@nestjstools/messaging");
const common_1 = require("@nestjs/common");
const nats_jet_stream_channel_1 = require("../channel/nats-jet-stream.channel");
const jsapi_types_1 = require("nats/lib/jetstream/jsapi_types");
const nats_jet_stream_channel_config_1 = require("../channel/nats-jet-stream-channel.config");
let NatsJetStreamMessagingConsumer = class NatsJetStreamMessagingConsumer {
channel = undefined;
async consume(dispatcher, channel) {
this.channel = channel;
const jsm = await channel.jetStreamManager();
const js = await channel.jetStreamClient();
try {
await jsm.streams.info(channel.config.streamConfig.streamName);
if (channel.config.streamConfig.autoUpdate) {
await jsm.streams.update(channel.config.streamConfig.streamName, {
subjects: channel.config.streamConfig.deliverSubjects,
max_msgs: channel.config.streamConfig.maxMsgs,
max_bytes: channel.config.streamConfig.maxBytes,
});
}
}
catch (err) {
if (err.code === '404') {
await jsm.streams.add({
name: channel.config.streamConfig.streamName,
subjects: channel.config.streamConfig.deliverSubjects,
max_msgs: channel.config.streamConfig.maxMsgs,
max_bytes: channel.config.streamConfig.maxBytes,
retention: jsapi_types_1.RetentionPolicy.Interest,
storage: channel.config.streamConfig.storageType === nats_jet_stream_channel_config_1.StorageType.Memory
? jsapi_types_1.StorageType.Memory
: jsapi_types_1.StorageType.File,
});
}
else {
throw err;
}
}
try {
await jsm.consumers.add(channel.config.streamConfig.streamName, {
durable_name: channel.config.consumerConfig.durableName,
filter_subject: channel.config.consumerConfig.subject,
ack_policy: jsapi_types_1.AckPolicy.None,
deliver_policy: jsapi_types_1.DeliverPolicy.New,
});
}
catch (e) {
if (channel.config.consumerConfig.autoUpdate &&
channel.config.consumerConfig.durableName) {
await jsm.consumers.update(channel.config.streamConfig.streamName, channel.config.consumerConfig.durableName, {
filter_subject: channel.config.consumerConfig.subject,
});
}
}
const consumer = await js.consumers.get(channel.config.streamConfig.streamName, channel.config.consumerConfig.durableName);
const messages = await consumer.consume();
async function consumeMessages() {
for await (const msg of messages) {
const headers = msg.headers ?? undefined;
const deserialized = msg.json();
await dispatcher.dispatch(new messaging_1.ConsumerMessage(deserialized, headers?.get('messaging-routing-key') ?? msg.subject));
}
}
consumeMessages();
return Promise.resolve();
}
async onError(errored, channel) {
return Promise.resolve();
}
};
exports.NatsJetStreamMessagingConsumer = NatsJetStreamMessagingConsumer;
exports.NatsJetStreamMessagingConsumer = NatsJetStreamMessagingConsumer = __decorate([
(0, common_1.Injectable)(),
(0, messaging_1.MessageConsumer)(nats_jet_stream_channel_1.NatsJetStreamChannel)
], NatsJetStreamMessagingConsumer);
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