opbi / toolchain

import { initTracer } from 'jaeger-client';

import logger from './logger';

const config = {

  // serviceName is anchored to APP_NAME exported in Makefile

  serviceName: process.env.APP_NAME,

  sampler: {

    type: 'const',

    param: 1,

  },

  reporter: {

    logSpans: process.env.NODE_ENV === 'development',

  },

};

const option = { logger };

const configTracer = () => initTracer(config, option);

let instance;

const tracer = {

  rootSpan: undefined,

  start: (name) => {

    if (!instance) {

      instance = configTracer();

    }

    if (tracer.rootSpan) {

      const span = instance.startSpan(name, { childOf: tracer.rootSpan });

      return span;

    }

    const span = instance.startSpan(name);

    tracer.rootSpan = span;

    return span;

  },

};

export default tracer;