ipfs-api/src/dht/get.js

A client library for the IPFS HTTP API

'use strict'

const promisify = require('promisify-es6')

module.exports = (send) => {
  return promisify((key, opts, callback) => {
    if (typeof opts === 'function' && !callback) {
      callback = opts
      opts = {}
    }

    // opts is the real callback --
    // 'callback' is being injected by promisify
    if (typeof opts === 'function' && typeof callback === 'function') {
      callback = opts
      opts = {}
    }

    function handleResult (done, err, res) {
      if (err) {
        return done(err)
      }
      if (!res) {
        return done(new Error('empty response'))
      }
      if (res.length === 0) {
        return done(new Error('no value returned for key'))
      }

      // Inconsistent return values in the browser vs node
      if (Array.isArray(res)) {
        res = res[0]
      }

      if (res.Type === 5) {
        done(null, res.Extra)
      } else {
        let error = new Error('key was not found (type 6)')
        done(error)
      }
    }

    send({
      path: 'dht/get',
      args: key,
      qs: opts
    }, handleResult.bind(null, callback))
  })
}