Koa Devstack Sleuth
Koa middleware for traceability of requests, based on the spring sleuth headers
Usage
This middelware is a distributed tracing solution for Koa v2, borrowing heavily from Dapper.
Example
var koa = require('koa');
var sleuth = require('koa-devstack-sleuth');
var app = new koa();
app.use(sleuth());However if you want to use in microservices, in this version of koa-devstack-sleuth, you need add the header before call to other microservices. If you use request-promise see example below:
var options = {
uri: 'https://api.github.com/user/repos',
qs: {
access_token: 'xxxxx xxxxx' // -> uri + '?access_token=xxxxx%20xxxxx'
},
headers: {
'X-B3-SpanId': ctx.get('X-B3-SpanId'),
'X-B3-TraceId': ctx.get('X-B3-TraceId')
},
json: true // Automatically parses the JSON string in the response
};
rp(options)
.then(function (repos) {
console.log('User has %d repos', repos.length);
})
.catch(function (err) {
// API call failed...
});Additional Information
If you want to use this library, you need at least node v.7 and Harmony.
