overleaf/libraries/metrics/tracing.js

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let tracer
function tracingEnabled() {
return process.env.GCP_OPENTELEMETRY || process.env.JAEGER_OPENTELEMETRY
}
function initialize(appName) {
const opentelemetry = require('@opentelemetry/sdk-node')
const {
getNodeAutoInstrumentations,
} = require('@opentelemetry/auto-instrumentations-node')
const {
diag,
DiagConsoleLogger,
DiagLogLevel,
trace,
} = require('@opentelemetry/api')
const { JaegerExporter } = require('@opentelemetry/exporter-jaeger')
const { Resource } = require('@opentelemetry/resources')
const {
SemanticResourceAttributes,
} = require('@opentelemetry/semantic-conventions')
const GCP = require('@google-cloud/opentelemetry-cloud-trace-exporter')
diag.setLogger(new DiagConsoleLogger(), DiagLogLevel.INFO)
const resource = new Resource({
[SemanticResourceAttributes.SERVICE_NAME]: appName,
[SemanticResourceAttributes.SERVICE_NAMESPACE]: 'Overleaf',
'host.type': 'VM',
})
let exporter
if (process.env.GCP_OPENTELEMETRY) {
exporter = new GCP.TraceExporter()
} else if (process.env.JAEGER_OPENTELEMETRY) {
exporter = new JaegerExporter({ host: process.env.JAEGER_HOST || 'jaeger' })
} else {
return
}
const sdk = new opentelemetry.NodeSDK({
traceExporter: exporter,
logger: console,
instrumentations: [getNodeAutoInstrumentations()],
resource,
})
tracer = trace.getTracer(appName)
sdk.start()
}
function getTracer() {
return tracer
}
module.exports = { initialize, getTracer, tracingEnabled }