47 lines
1.5 KiB
JavaScript
47 lines
1.5 KiB
JavaScript
'use strict';
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const api = require('@opentelemetry/api');
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const tracer = require('./tracer')('example-grpc-client');
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const grpc = require('grpc');
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const messages = require('./helloworld_pb');
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const services = require('./helloworld_grpc_pb');
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const PORT = 50051;
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/** A function which makes requests and handles response. */
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function main() {
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// span corresponds to outgoing requests. Here, we have manually created
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// the span, which is created to track work that happens outside of the
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// request lifecycle entirely.
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const span = tracer.startSpan('client.js:main()');
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api.context.with(api.trace.setSpan(api.context.active(), span), () => {
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console.log('Client traceId ', span.spanContext().traceId);
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const client = new services.GreeterClient(
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`localhost:${PORT}`,
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grpc.credentials.createInsecure(),
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);
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const request = new messages.HelloRequest();
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let user;
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if (process.argv.length >= 3) {
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// eslint-disable-next-line prefer-destructuring
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user = process.argv[2];
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} else {
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user = 'world';
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}
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request.setName(user);
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client.sayHello(request, (err, response) => {
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span.end();
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if (err) throw err;
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console.log('Greeting:', response.getMessage());
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});
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});
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// The process must live for at least the interval past any traces that
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// must be exported, or some risk being lost if they are recorded after the
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// last export.
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console.log('Sleeping 5 seconds before shutdown to ensure all records are flushed.');
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setTimeout(() => { console.log('Completed.'); }, 5000);
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}
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main();
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