/
04_consume.ts
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/
04_consume.ts
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/*
* Copyright 2023 The NATS Authors
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { connect } from "../../src/mod.ts";
import { setupStreamAndConsumer } from "./util.ts";
// create a connection
const nc = await connect();
// create a stream with a random name with some messages and a consumer
const { stream, consumer } = await setupStreamAndConsumer(nc);
// retrieve an existing consumer
const js = nc.jetstream();
const c = await js.consumers.get(stream, consumer);
// the consumer is wrapped in loop because this way, if there's some failure
// it will re-setup consume, and carry on.
// this is the basic pattern for processing messages forever
while (true) {
console.log("waiting for messages");
const messages = await c.consume();
try {
for await (const m of messages) {
console.log(m.seq);
m.ack();
}
} catch (err) {
console.log(`consume failed: ${err.message}`);
}
}