/
tracer.js
47 lines (38 loc) · 1.73 KB
/
tracer.js
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'use strict';
const opentelemetry = require('@opentelemetry/api');
// Not functionally required but gives some insight what happens behind the scenes
const { diag, DiagConsoleLogger, DiagLogLevel } = opentelemetry;
diag.setLogger(new DiagConsoleLogger(), DiagLogLevel.INFO);
const { registerInstrumentations } = require('@opentelemetry/instrumentation');
const { NodeTracerProvider } = require('@opentelemetry/node');
const { SimpleSpanProcessor } = require('@opentelemetry/tracing');
const { JaegerExporter } = require('@opentelemetry/exporter-jaeger');
const { ZipkinExporter } = require('@opentelemetry/exporter-zipkin');
const { Resource } = require('@opentelemetry/resources');
const { SemanticResourceAttributes: ResourceAttributesSC } = require('@opentelemetry/semantic-conventions');
const Exporter = (process.env.EXPORTER || '')
.toLowerCase().startsWith('z') ? ZipkinExporter : JaegerExporter;
const { ExpressInstrumentation } = require('@opentelemetry/instrumentation-express');
const { HttpInstrumentation } = require('@opentelemetry/instrumentation-http');
module.exports = (serviceName) => {
const provider = new NodeTracerProvider({
resource: new Resource({
[ResourceAttributesSC.SERVICE_NAME]: serviceName,
}),
});
registerInstrumentations({
tracerProvider: provider,
instrumentations: [
// Express instrumentation expects HTTP layer to be instrumented
HttpInstrumentation,
ExpressInstrumentation,
],
});
const exporter = new Exporter({
serviceName,
});
provider.addSpanProcessor(new SimpleSpanProcessor(exporter));
// Initialize the OpenTelemetry APIs to use the NodeTracerProvider bindings
provider.register();
return opentelemetry.trace.getTracer('express-example');
};