zookeeper-helpers.js
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'usu strict';
const _ = require('lodash');
const zookeeper = require('node-zookeeper-client');
const _createClient = (server) => new Promise((resolve, reject) => {
const client = zookeeper.createClient(server);
let isServerStart = false;
client.once('connected', function (err) {
isServerStart = true;
err ? reject(err) : resolve(client);
});
setTimeout(() => {
!isServerStart && reject({message: 'Failed to authenticate with the server.', code: -1});
}, 5000);
client.connect();
});
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) => {
return _createClient(server).then(client => {
_exists(client, path).then(stat => {
client.close();
resolve(stat);
});
}).catch(state => {
reject(state);
});
});
const creator = (server, path, value, iscover) => new Promise((resolve, reject) => {
return _createClient(server).then(client => {
_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);
}
});
}
});
}).catch(state => {
reject(state);
});
});
const getter = (server, path) => new Promise((resolve, reject) => {
return _createClient(server).then(client => {
_exists(client, path).then(stat => {
if (stat) {
client.getData(
path,
(err, data, statData) => {
if (err) {
console.log('Get 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();
}
});
}).catch(state => {
reject(state);
});
});
const setter = (server, path, value) => new Promise((resolve, reject) => {
return _createClient(server).then(client => {
_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 {
resolve(true);
}
});
} else {
client.close();
resolve(false);
}
});
}).catch(state => {
reject(state);
});
});
const remove = (server, path) => new Promise((resolve, reject) => {
return _createClient(server).then(client => {
_exists(client, path).then(stat => {
if (stat) {
client.remove(path, function(err) {
client.close();
err ? resolve(false) : resolve(true);
});
} else {
client.close();
resolve(false);
}
});
}).catch(state => {
reject(state);
});
});
module.exports = {
exists,
creator,
setter,
getter,
remove
};