openhim-core/src/api/heartbeat.js

The OpenHIM core application that provides logging and routing of http requests

import moment from 'moment'
import * as utils from '../utils'
import * as server from '../server'
import { MediatorModelAPI } from '../model/mediators'
import { promisify } from 'util'

export async function getHeartbeat (ctx) {
  try {
    const uptime = promisify(server.getUptime)
    const result = await uptime()

    const mediators = await MediatorModelAPI.find().exec()
    for (const mediator of Array.from(mediators)) {
      if (!result.mediators) { result.mediators = {} }

      if ((mediator._lastHeartbeat != null) && (mediator._uptime != null) &&
        // have we received a heartbeat within the last minute?
        (moment().diff(mediator._lastHeartbeat, 'seconds') <= 60)) {
        result.mediators[mediator.urn] = mediator._uptime
      } else {
        result.mediators[mediator.urn] = null
      }
    }

    result.now = Date.now()
    ctx.body = result
  } catch (e) {
    return utils.logAndSetResponse(ctx, 500, `Error: ${e}`, 'error')
  }
}