Perf traces in the CLI.

packages/xen-api/package.json

@@ -30,6 +30,7 @@
   ],
   "dependencies": {
     "babel-runtime": "^5",
+    "blocked": "^1.1.0",
     "bluebird": "^2.9.21",
     "debug": "^2.1.3",
     "event-to-promise": "^0.3.2",

packages/xen-api/src/cli.js

@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+import blocked from 'blocked'
 import Bluebird, {coroutine} from 'bluebird'
 import eventToPromise from 'event-to-promise'
 import execPromise from 'exec-promise'
@@ -9,17 +10,27 @@ import {start as createRepl} from 'repl'
 
 import {createClient} from './'
 
+// ===================================================================
+
+Bluebird.longStackTraces()
+
+import createDebug from 'debug'
+const debug = createDebug('xen-api:cli')
+
 import sourceMapSupport from 'source-map-support'
 sourceMapSupport.install()
 
+// ===================================================================
+
 const usage = `Usage: xen-api <url> <user>`
 
 const main = coroutine(function * (args) {
   const opts = minimist(args, {
-    boolean: ['help'],
+    boolean: ['help', 'verbose'],
 
     alias: {
-      help: 'h'
+      help: 'h',
+      verbose: 'v'
     }
   })
 
@@ -27,6 +38,13 @@ const main = coroutine(function * (args) {
     return usage
   }
 
+  if (opts.verbose) {
+    // Does not work perfectly.
+    //
+    // https://github.com/visionmedia/debug/pull/156
+    createDebug.enable('xen-api,xen-api:*')
+  }
+
   const [url, user] = opts._
   if (!url || !user) {
     throw new Error('missing arguments')
@@ -37,6 +55,13 @@ const main = coroutine(function * (args) {
     pw(resolve)
   })
 
+  {
+    const debug = createDebug('xen-api:perf')
+    blocked(ms => {
+      debug('blocked for %sms', ms | 0)
+    })
+  }
+
   const xapi = createClient({url, auth: {user, password}})
   yield xapi.connect()
 

packages/xen-api/src/index.js

@@ -107,10 +107,16 @@ const noop = () => {}
 
 // -------------------------------------------------------------------
 
-const notConnectedPromise = Bluebird.reject(new Error('not connected'))
+let getNotConnectedPromise = function () {
+  const promise = Bluebird.reject(new Error('not connected'))
 
-// Does nothing but avoid a Bluebird message error.
-notConnectedPromise.catch(noop)
+  // Does nothing but avoid a Bluebird message error.
+  promise.catch(noop)
+
+  getNotConnectedPromise = () => promise
+
+  return promise
+}
 
 // ===================================================================
 
@@ -155,7 +161,7 @@ export class Xapi extends EventEmitter {
     this._url = parseUrl(opts.url)
     this._auth = opts.auth
 
-    this._sessionId = notConnectedPromise
+    this._sessionId = getNotConnectedPromise()
 
     this._init()
 
@@ -237,7 +243,7 @@ export class Xapi extends EventEmitter {
       })
     }
 
-    this._sessionId = notConnectedPromise
+    this._sessionId = getNotConnectedPromise()
 
     return Bluebird.resolve().then(() => {
       debug('%s: disconnected', this._humanId)
@@ -316,7 +322,7 @@ export class Xapi extends EventEmitter {
       // Try to login again.
       debug('%s: the session has been reinitialized', this._humanId)
 
-      this._sessionId = notConnectedPromise
+      this._sessionId = getNotConnectedPromise()
 
       return this._sessionCall(method, args)
     })