client.coffee

   1 #!/usr/bin/coffee
   2
   3 fs = require 'fs'
   4 async = require 'async'
   5 af = require './api.coffee'
   6
   7 token_file = "#{process.env.HOME}/.af-coffee-token"
   8
   9 timeout = (ms, f) -> setTimeout f, ms
  10
  11 # a session caches the api access token and prompts for the username and
  12 # password if it goes stale. It re-tries API calls that fail due to
  13 # invalid/expired token
  14
  15 commands = {}
  16 for k, v of af
  17         commands[k] = v unless k is 'login'
  18
  19 # this is the friendly one that updates the files then restarts the app
  20 commands.app_publish = (token, app_name, zip_file, callback) ->
  21         async.waterfall [
  22                 (callback) =>      @api 'app_update_files', app_name, zip_file, callback
  23                 (res, callback) => @api 'app_restart',      app_name, callback
  24         ], callback
  25
  26 commands.app_set_state = (token, app_name, state, callback) ->
  27         async.waterfall [
  28                 (callback) =>
  29                         @api 'app_info', app_name, callback
  30                 (info, callback) =>
  31                         info.state = state
  32                         @api 'app_set_info', app_name, info, callback
  33         ], callback
  34
  35 commands.app_start = (token, app_name, callback) ->
  36         @api 'app_set_state', app_name, 'STARTED', callback
  37
  38 commands.app_stop = (token, app_name, callback) ->
  39         @api 'app_set_state', app_name, 'STOPPED', callback
  40
  41
  42 commands.app_restart = (token, app_name, callback) ->
  43         # Server requires you to fetch the app state before each call to change
  44         # it, so there's no quicker way than just calling app_stop then app_start
  45         async.waterfall [
  46                 (callback) =>      @api 'app_stop',  app_name, callback
  47                 (res, callback) => @api 'app_start', app_name, callback
  48         ], callback
  49
  50
  51
  52 class Session
  53         constructor: ->
  54                 @token = 0
  55
  56         api: (call, args..., callback) ->
  57                 async.waterfall [
  58                         (callback) =>
  59                                 switch @token
  60                                         when 0
  61                                                 get_token callback
  62                                         when -1
  63                                                 login callback
  64                                         else
  65                                                 callback null, @token
  66                         (token, callback) =>
  67                                 @token = token
  68                                 # commands implemented in client.coffee need "this" pointing to the session
  69                                 commands[call].call this, @token, args..., callback
  70                 ], (err, result) =>
  71                         # eg /app/xxx/stats sometimes returns 404 with wrong auth token
  72                         if err?.code is 403 or err?.code is 404
  73                                 @token = -1
  74                                 @api(call, args..., callback)
  75                         else
  76                                 callback err, result
  77
  78 ask = (opts, callback) ->
  79         process.stdout.write opts.prompt
  80         process.stdin.setEncoding 'utf8'
  81         process.stdin.resume()
  82         process.stdin.once 'data', (line) ->
  83                 if opts.silent
  84                         # send ^[[A^[[2K to move the cursor up one line, then clear that line
  85                         process.stdout.write new Buffer [27, 91, 65, 27, 91, 50, 75]
  86                         process.stdout.write opts.prompt + "***\n"
  87                 process.stdin.pause()
  88                 callback null, (line.substr 0, line.length - 1)
  89
  90 get_token = (callback) ->
  91         fs.readFile token_file, 'utf8', (err, token) ->
  92                 if err?
  93                         login callback
  94                 else
  95                         callback null, token
  96
  97 login = (callback) ->
  98         async.waterfall [
  99                 (callback) -> async.series [
 100                         (callback) -> ask prompt: 'username: ', callback
 101                         (callback) -> ask prompt: 'password: ', silent: true, callback
 102                 ], callback
 103                 ([username, password], callback) ->
 104                         af.login username, password, callback
 105                 (token, callback) ->
 106                         # wait for file write so there's no race condition if get_token gets called soon
 107                         fs.writeFile token_file, token, (err) ->
 108                                 if err
 109                                         process.stderr.write "Warning: couldn't cache auth token in #{token_file}: #{err}\n"
 110                                 # don't pass on error, it's ok if we can't cache it
 111                                 callback null, token
 112         ], callback
 113
 114
 115 exports.new_session = ->
 116         return new Session()
 117
 118 usage = ->
 119         process.stderr.write "usage: #{process.argv[0]} #{process.argv[1]} command [args...]\n"
 120         process.stderr.write "valid commands are:\n\t#{(k for k, v of commands).join '\n\t'}\n"
 121
 122 # parse and act on commandline arguments unless we were require()d as a module
 123 if require.main is module
 124         args = process.argv[2..]
 125         if args.length is 0
 126                 usage()
 127         else if not commands[args[0]]
 128                 process.stderr.write "unknown command \"#{args[0]}\"\n"
 129                 usage()
 130         else
 131                 session = new Session()
 132                 session.api args[0], args[1..]..., (err, result) ->
 133                         if err?
 134                                 process.stderr.write "Error: #{JSON.stringify err}\n"
 135                         if result?
 136                                 if typeof result is 'string'
 137                                         process.stdout.write result
 138                                 else
 139                                         process.stdout.write JSON.stringify result