Trail-agent NPM

node-trail-agent

Distributed tracing agent for Node.js

npm install --save trail-agent

Install other instrument libraries

npm install --save trail-instrument-redis

Initialize agent

var agent = require('trail-agent')
agent.instrument(['trail-instrument-redis'])
agent.setRecorder((span) => {
    console.log(span)
})

Record in anywhere else

var agent = require('trail-agent')
let span = agent.start()
setTimeout(() => {
    span.setTag('key', 'value')
    span.finish()
})

To instrument library, you should provide a module with

target: indicate targeting module name.
wrap(agent, module): method with trail-agent instance and target module as arguments, return wrapped module.
unwrap(): method to unwrap method wrapped by wrap(), intention of this method is unwrap method in tests.

Common tags