From 293bcf98b7841f6f7b406c18bcc37fa6135a3ea6 Mon Sep 17 00:00:00 2001
From: Melvin Philips <mphilips@vmware.com>
Date: Wed, 31 Jan 2018 23:54:21 -0800
Subject: [PATCH] feat: implement `ipfs ping` flags #928

---
 src/cli/commands/ping.js        | 44 +++++++++++++++++++++++++++++++++
 src/core/components/ping.js     | 30 ++++++++++++++++++++--
 src/http/api/resources/index.js |  1 +
 src/http/api/resources/ping.js  | 18 ++++++++++++++
 src/http/api/routes/index.js    |  1 +
 src/http/api/routes/ping.js     | 19 ++++++++++++++
 test/cli/commands.js            |  2 +-
 7 files changed, 112 insertions(+), 3 deletions(-)
 create mode 100644 src/cli/commands/ping.js
 create mode 100644 src/http/api/resources/ping.js
 create mode 100644 src/http/api/routes/ping.js

diff --git a/src/cli/commands/ping.js b/src/cli/commands/ping.js
new file mode 100644
index 0000000000..e1103849f5
--- /dev/null
+++ b/src/cli/commands/ping.js
@@ -0,0 +1,44 @@
+'use strict'
+
+const print = require('../utils').print
+
+module.exports = {
+  command: 'ping <peerId>',
+
+  describe: 'Measure the latency of a connection',
+
+  builder: {
+    count: {
+      alias: 'n',
+      type: 'integer',
+      default: 10
+    }
+  },
+
+  handler (argv) {
+    const peerId = argv.peerId
+    const count = argv.count || 10
+
+    print('PING ' + peerId)
+
+    let noOfTimes = 0
+    let totalTime = 0
+
+    const pingCb = (err, p) => {
+      if (err) {
+        throw err
+      }
+      let time = p.Time
+      totalTime = totalTime + time
+      noOfTimes = noOfTimes + 1
+      print('Pong received: time=' + time + ' ms')
+      if (noOfTimes === count) {
+        print('Average latency: ' + totalTime / count + 'ms')
+      }
+    }
+
+    for (let i = 0; i < count; i++) {
+      argv.ipfs.ping(peerId, pingCb)
+    }
+  }
+}
diff --git a/src/core/components/ping.js b/src/core/components/ping.js
index eb7a45b34f..bcf7c10f6c 100644
--- a/src/core/components/ping.js
+++ b/src/core/components/ping.js
@@ -1,9 +1,35 @@
 'use strict'
 
 const promisify = require('promisify-es6')
+const OFFLINE_ERROR = require('../utils').OFFLINE_ERROR
+const PeerId = require('peer-id')
+const PeerInfo = require('peer-info')
+var Readable = require('stream').Readable
 
 module.exports = function ping (self) {
-  return promisify((callback) => {
-    callback(new Error('Not implemented'))
+  return promisify((peerId, cb) => {
+    if (!self.isOnline()) {
+      return cb(new Error(OFFLINE_ERROR))
+    }
+
+    var outputStream = new Readable()
+    outputStream._read = function (size) {
+    }
+
+    let peer
+    try {
+      peer = self._libp2pNode.peerBook.get(peerId)
+    } catch (err) {
+      peer = new PeerInfo(PeerId.createFromB58String(peerId))
+    }
+
+    self._libp2pNode.ping(peer, (err, p) => {
+      p.once('ping', (time) => {
+        outputStream.push(JSON.stringify([{}, { Success: true, Time: time }, { Text: 'Average latency: ' + time + ' ms' }]))
+        outputStream.push(null)
+        p.stop()
+        cb(err, outputStream)
+      })
+    })
   })
 }
diff --git a/src/http/api/resources/index.js b/src/http/api/resources/index.js
index 16b0f17128..4f54eccc5c 100644
--- a/src/http/api/resources/index.js
+++ b/src/http/api/resources/index.js
@@ -2,6 +2,7 @@
 
 exports.version = require('./version')
 exports.id = require('./id')
+exports.ping = require('./ping')
 exports.bootstrap = require('./bootstrap')
 exports.repo = require('./repo')
 exports.object = require('./object')
diff --git a/src/http/api/resources/ping.js b/src/http/api/resources/ping.js
new file mode 100644
index 0000000000..b8eaef90f4
--- /dev/null
+++ b/src/http/api/resources/ping.js
@@ -0,0 +1,18 @@
+'use strict'
+
+const boom = require('boom')
+
+exports = module.exports
+
+exports.get = (request, reply) => {
+  const ipfs = request.server.app.ipfs
+  const peerId = request.query.arg
+
+  ipfs.ping(peerId, (err, outputStream) => {
+    if (err) {
+      return reply(boom.badRequest(err))
+    }
+
+    return reply(outputStream).type('application/json').header('x-chunked-output', '1')
+  })
+}
diff --git a/src/http/api/routes/index.js b/src/http/api/routes/index.js
index 908c0c0878..6a3b085359 100644
--- a/src/http/api/routes/index.js
+++ b/src/http/api/routes/index.js
@@ -8,6 +8,7 @@ module.exports = (server) => {
   require('./object')(server)
   // require('./repo')(server)
   require('./config')(server)
+  require('./ping')(server)
   require('./swarm')(server)
   require('./bitswap')(server)
   require('./file')(server)
diff --git a/src/http/api/routes/ping.js b/src/http/api/routes/ping.js
new file mode 100644
index 0000000000..3d75a8580f
--- /dev/null
+++ b/src/http/api/routes/ping.js
@@ -0,0 +1,19 @@
+'use strict'
+
+const resources = require('./../resources')
+
+module.exports = (server) => {
+  const api = server.select('API')
+
+  api.route({
+    method: '*',
+    path: '/api/v0/ping',
+    config: {
+      payload: {
+        parse: false,
+        output: 'stream'
+      },
+      handler: resources.ping.get
+    }
+  })
+}
diff --git a/test/cli/commands.js b/test/cli/commands.js
index 3a2d85a418..cc85d812f6 100644
--- a/test/cli/commands.js
+++ b/test/cli/commands.js
@@ -4,7 +4,7 @@
 const expect = require('chai').expect
 const runOnAndOff = require('../utils/on-and-off')
 
-const commandCount = 60
+const commandCount = 61
 
 describe('commands', () => runOnAndOff((thing) => {
   let ipfs