ipfs/src/http/api/routes/debug.js

JavaScript implementation of the IPFS specification

'use strict'

const client = require('prom-client')
const Boom = require('boom')

// Clear the register to make sure we're not registering multiple ones
client.register.clear()
const gauge = new client.Gauge({ name: 'number_of_peers', help: 'the_number_of_currently_connected_peers' })

// Endpoint for handling debug metrics
module.exports = {
  method: 'GET',
  path: '/debug/metrics/prometheus',
  async handler (request, h) {
    if (!process.env.IPFS_MONITORING) {
      throw Boom.notImplemented('Monitoring is disabled. Enable it by setting environment variable IPFS_MONITORING')
    }

    const { ipfs } = request.server.app
    const peers = await ipfs.swarm.peers()

    gauge.set(peers.length)

    return h.response(client.register.metrics())
      .type(client.register.contentType)
  }
}