1 | var through = require('through2').obj;
|
2 | var request = require('request-promise');
|
3 | var Promise = require('bluebird');
|
4 |
|
5 | function wait(ms) {
|
6 | return new Promise(function(resolve){
|
7 | setTimeout(resolve, ms);
|
8 | });
|
9 | }
|
10 |
|
11 | function client(baseUrl, options){
|
12 | var queue = [],
|
13 | ended = false,
|
14 | ending = false,
|
15 | retries = 0,
|
16 | errorCount = 0,
|
17 | id, req, task;
|
18 |
|
19 | function send() {
|
20 | if (!queue.length && (!ending || ended)) {
|
21 | return Promise.resolve();
|
22 | }
|
23 | if (req) {
|
24 | return req;
|
25 | }
|
26 |
|
27 | var commands = queue;
|
28 | queue = [];
|
29 |
|
30 | if (ending) {
|
31 | ended = true;
|
32 | }
|
33 |
|
34 | var url;
|
35 |
|
36 | if (id) {
|
37 | url = '/tasks/'+id;
|
38 | } else {
|
39 | url = '/tasks';
|
40 | }
|
41 |
|
42 | var end = ending;
|
43 |
|
44 | var post = {
|
45 | url: baseUrl+url,
|
46 | json: true,
|
47 | body: {
|
48 | commands: commands,
|
49 | end: end
|
50 | }
|
51 | };
|
52 | for (var key in options) {
|
53 | post.body[key] = options[key];
|
54 | }
|
55 |
|
56 | req = (
|
57 | request.post(post).then(function(body){
|
58 | task = body;
|
59 | id = task.id;
|
60 | ended = end;
|
61 | req = null;
|
62 |
|
63 | var self = this;
|
64 |
|
65 | task.errors.slice(0, errorCount)
|
66 | .forEach(function(err){
|
67 | self.emit('error', err);
|
68 | });
|
69 |
|
70 | errorCount += task.errors.length;
|
71 |
|
72 | send();
|
73 | return;
|
74 | }).catch(function(err){
|
75 | queue = commands.concat(queue);
|
76 | req = null;
|
77 |
|
78 | retries++;
|
79 | if (retries === 10) {
|
80 | console.log('Failed to run commands after 10 retries\n '+commands.join('\n '), err);
|
81 | throw err;
|
82 | }
|
83 |
|
84 | return wait(1000 * 10).then(send);
|
85 | })
|
86 | );
|
87 |
|
88 | return req;
|
89 | }
|
90 |
|
91 | function end() {
|
92 | ending = true;
|
93 | return send();
|
94 | }
|
95 |
|
96 | var pollRetries = 0, polls = 0;
|
97 |
|
98 | function pollForCompletion(delayed) {
|
99 | if (delayed) {
|
100 | return (new Promise(function(resolve){
|
101 |
|
102 | var delay = 4096;
|
103 | if (polls <= 11) {
|
104 | delay = 10+Math.pow(2, polls);
|
105 | }
|
106 | polls++;
|
107 |
|
108 | setTimeout(resolve, delay);
|
109 | }).then(pollForCompletion));
|
110 | }
|
111 |
|
112 | return (
|
113 | request.get({
|
114 | url: baseUrl+'/tasks/'+id,
|
115 | json: true
|
116 | }).then(function(body){
|
117 | task = body;
|
118 | if (task.running) {
|
119 | return pollForCompletion(true);
|
120 | } else {
|
121 | return task;
|
122 | }
|
123 | })
|
124 | .catch(function(err){
|
125 | pollRetries++;
|
126 |
|
127 | if (pollRetries === 10) {
|
128 | throw err;
|
129 | }
|
130 |
|
131 | return pollForCompletion(true);
|
132 | })
|
133 | );
|
134 | }
|
135 |
|
136 | return through(function(command, enc, cb){
|
137 | queue.push(command);
|
138 | send().then(cb.bind(null, null, null)).catch(cb);
|
139 | }, function(cb){
|
140 | var self = this;
|
141 | end()
|
142 | .then(pollForCompletion)
|
143 | .then(function(){
|
144 | self.push(task);
|
145 | cb();
|
146 | })
|
147 | .catch(cb);
|
148 | });
|
149 | }
|
150 |
|
151 | module.exports = client;
|