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Added support for tracing to the api-server service.
- Added a tracing backend service powered by Jaeger. - Instrumented api-server service using the jaeger-client Opentracing library.
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Uzziah Eyee
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May 4, 2019
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,17 +1,60 @@ | ||
| const app = require('express')() | ||
| const uuid = require('uuid/v1') | ||
| const axios = require('axios') | ||
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| // For portability, we initialize tracer from envars instead of local options. | ||
| // See: https://www.npmjs.com/package/jaeger-client#environment-variables | ||
| var initTracer = require('jaeger-client').initTracerFromEnv; | ||
| var tracer = initTracer(); | ||
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| app.use('/api/v1/tokens', (req, res) => { | ||
| const span = tracer.startSpan('token-request') | ||
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| console.log(`Handling request for token`) | ||
| res.json({token: uuid()}) | ||
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| span.finish() | ||
| }) | ||
| app.use('/api/v1/whereami', (req, res) => { | ||
| // TODO: get geolocation info from IP address | ||
| // TODO: get weather info from geolocation | ||
| // TODO: return everything | ||
| let data = {'info': null} | ||
| res.json(data) | ||
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| app.use('/api/v1/whereami', async (req, res, next) => { | ||
| const parentSpan = tracer.startSpan('whereami-request') | ||
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| try { | ||
| // get location of IP Address | ||
| const IP = '23.16.76.104' | ||
| const locSpan = tracer.startSpan('get-location', {childOf: parentSpan}) | ||
| const location = await axios.get(`http://ip-api.com/json/${IP}`) | ||
| locSpan.finish() | ||
| const {lat, lon, city, country} = location.data | ||
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| // do some other async task | ||
| const fakeSpan = tracer.startSpan('fake-fetch', {childOf: parentSpan}) | ||
| const _ = await fakeFetch(100, 0.7) | ||
| fakeSpan.finish() | ||
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| // return results | ||
| const data = {lat: lat, lon: lon, city: city, country: country} | ||
| res.json(data) | ||
| } catch(err) { | ||
| parentSpan.setTag('ERROR', err) | ||
| next(err) | ||
| } | ||
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| parentSpan.finish() | ||
| }) | ||
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| const server = app.listen(process.env.PORT || 3000, () => { | ||
| console.log(`Listening on ${ server.address().address }:${ server.address().port }`) | ||
| }) | ||
| }) | ||
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| function fakeFetch(msDelay, successRate) { | ||
| return new Promise((resolve, reject) => { | ||
| setTimeout(() => { | ||
| if (Math.random() <= successRate) { | ||
| resolve() | ||
| } else { | ||
| reject('Fake fetch failed randomly.') | ||
| } | ||
| }, msDelay) | ||
| }) | ||
| } |
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