zookeeper-helpers.js
3.75 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
'usu strict';
const _ = require('lodash');
const zookeeper = require('node-zookeeper-client');
const _exists = (client, path) => new Promise((resolve, reject) => {
client.exists(path, (err, stat) => {
if (err) {
console.log('path %s exits error', path, err.stack);
resolve(false);
} else {
resolve(stat ? true : false);
}
});
});
const exists = (server, path) => new Promise((resolve, reject) => {
const client = zookeeper.createClient(server);
client.once('connected', function () {
_exists(client, path).then(stat => {
client.close();
resolve(stat);
});
});
client.connect();
});
const creator = (server, path, value, iscover) => new Promise((resolve, reject) => {
const client = zookeeper.createClient(server);
client.once('connected', function () {
_exists(client, path).then(stat => {
if (stat && iscover) {
client.setData(path, new Buffer(value.toString()), function(err, data, stat) {
client.close();
if (err) {
console.log('update path %s data error');
resolve(false);
} else {
console.log('path %s data change to', path, value);
resolve(true);
}
});
} else if (stat) {
client.close();
resolve(true);
} else {
client.mkdirp(path, new Buffer(value), (err, path) => {
client.close();
if (err) {
console.log('Node %s create err', path, err.stack);
resolve(false);
} else {
console.log('Node %s is created', path);
resolve(true);
}
});
}
});
});
client.connect();
});
const getter = (server, path) => new Promise((resolve, reject) => {
const client = zookeeper.createClient(server);
client.once('connected', function () {
_exists(client, path).then(stat => {
if (stat) {
client.getData(
path,
(err, data, statData) => {
if (err) {
console.log('Got path %s data error', path, err.stack);
}
client.close();
resolve(data && data.toString('utf8'));
}
)
} else {
// 不存在的路径
console.log('no path %s, we will create it with value "false" automatic', path);
client.close();
resolve();
}
})
});
client.connect();
});
const setter = (server, path, value) => new Promise((resolve, reject) => {
const client = zookeeper.createClient(server);
client.once('connected', function () {
_exists(client, path).then(stat => {
if (stat) {
client.setData(path, new Buffer(val.toString()), function(err, data, stat) {
client.close();
if (err) {
console.log('update path %s data error');
resolve(false);
} else {
console.log('path %s data change to', path, value);
resolve(true);
}
});
} else {
client.close();
resolve(false);
}
});
});
client.connect();
});
module.exports = {
exists,
creator,
setter,
getter
};