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iservice.js
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iservice.js
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/* vim: set expandtab tabstop=2 shiftwidth=2 foldmethod=marker: */
"use strict";
var fs = require('fs');
var Path = require('path');
var Util = require('util');
var Tool = require(__dirname + '/tool.js');
var Events = require(__dirname + '/events.js');
var WHOAMI = [require('os').hostname(), process.pid, ];
setInterval(function () {
WHOAMI[0] = require('os').hostname();
}, 60000);
try {
exports.version = JSON.parse(fs.readFileSync(__dirname + '/../package.json', 'utf-8').trim()).version;
} catch (e) {
exports.version = 'unknown';
}
exports.create = function (options) {
/* {{{ config and init */
var _options = {};
for (var i in options) {
_options[i] = options[i];
}
_options.root = Tool.clean(_options.root);
var _http = require(__dirname + '/http-client.js').create({
'prefix' : '/api',
'heartbeat' : 60000,
'pingurl' : '/status.taobao',
'timeout' : 2000, /**< timeout for http call (ms) */
});
_options.host.split(',').forEach(function (item) {
item = item.split(':');
_http.bind(item[0], item[1] || 80);
});
/* }}} */
var _rand = parseInt(100000 * Math.random(), 10);
/* {{{ function _buildURL() */
var _buildURL = function (key, method) {
return Util.format('/%s/%s', method,
encodeURIComponent(Tool.clean(Tool.normalize(_options.root + '/' + key))));
};
/* }}} */
/* {{{ function _parseRes() */
var _parseRes = function (data, callback) {
try {
data = JSON.parse(data.toString());
} catch (e) {
return callback('FormatError', Tool.iError(e));
}
if (!data) {
return callback('FormatError', 'empty data');
}
if (data.error) {
return callback('RemoteError', data.error);
}
callback(null, data.data);
};
/* }}} */
var _me = {};
/**
* @ 访问缓存
*/
var _caches = {};
var selfFolder = Tool.normalize(_options.cache + '/iservice_cache_' + process.pid);
/* {{{ public function get() */
_me.get = function (key) {
key = Tool.normalize('/' + key);
if (_caches[key]) {
return _caches[key];
}
var fna = Tool.normalize(Util.format('%s/%s/%s.zk', selfFolder, _options.root, key));
try {
var data = JSON.parse(fs.readFileSync(fna, 'utf-8'));
_caches[key] = data;
return data;
} catch(e) {
return null;
}
};
/* }}} */
/*{{{ public function getTree() */
_me.getTree = function (key) {
var _self = this;
var tree = {};
/*{{{ cover() */
var cover = function (path) {
try {
var absPath = Tool.normalize(Util.format('%s/%s/%s', selfFolder, _options.root, path));
var file = fs.statSync(absPath);
if (file.isDirectory()) {
var list = fs.readdirSync(absPath);
list.forEach(function (f) {
cover(Tool.normalize(path + '/' + f));
});
} else {
try {
fs.statSync(absPath.substr(0, absPath.length - 3));
return;
} catch(e) {
var key = path.substr(0, path.length - 3);
var data = _self.get(key);
tree[key] = {
data : data ? data.data : undefined,
meta : data ? data.meta : undefined
}
}
}
} catch(e) {
return;
}
}
/*}}}*/
cover(Tool.normalize(key));
return tree;
}
/*}}}*/
/* {{{ public function watch() */
_me.watch = function (key, timeout, callback) {
timeout = timeout || 60000;
var cfg = {
'User-Agent' : 'iservice-client@' + exports.version,
'x-app-tmout' : timeout - 30,
'x-app-token' : _options.token,
};
var url = _buildURL(key, 'watch');
var tms = Math.max(10, Math.min(3000, Math.ceil(timeout / 10)));
(function _checkupdate() {
var val = _me.get(key);
var data = val ? val.data : undefined;
cfg['x-app-uuid'] = WHOAMI.join('-') + '-' + _rand;
_http.post(url, data || '', function (error, data) {
if (error) {
callback(error);
} else {
_parseRes(data, callback);
}
setTimeout(_checkupdate, tms);
}, cfg, timeout);
})();
};
/* }}} */
/* {{{ public function sync() */
_me.sync = function (root, callback) {
var cfg = {
'User-Agent' : 'iservice-client@' + exports.version,
'x-app-token' : _options.token,
'x-app-uuid' : WHOAMI.join('-') + '-' + _rand,
};
_http.get(_buildURL(root, 'tree'), function (error, data) {
if (error) {
return callback(error);
}
_parseRes(data, function (error, data) {
if (error) {
return callback(error);
}
var dir = Tool.clean(Tool.normalize(Util.format(
'/%s/%s/%s', selfFolder, _options.root, root)), 2);
var evt = Events.create(function (error) {
if (!error) {
Tool.rmdir(dir);
fs.renameSync(dir + '_tmp', dir);
try {
fs.renameSync(dir + '.zk_tmp', dir + '.zk');
} catch(e) {}
_me.removeAllCache();
}
callback(error);
});
Tool.rmdir(dir + '_tmp');
data = data || {};
if (Object.keys(data).length === 0) {
evt.wait('empty', function(){
evt.emit('empty', Tool.iError('NoConfig', 'no config'));
});
}
for (var key in data) {
(function () {
var idx = key;
evt.wait(idx, function () {
var relative = idx.substr(Path.normalize('/' + _options.root + '/' + root).length);
var _fn = '';
if (Tool.normalize('/' + relative) !== '/') {
_fn = Tool.normalize(dir + '_tmp/' + relative + '.zk');
} else {
_fn = Tool.normalize(dir + '.zk_tmp');
}
Tool.mkdir(Path.dirname(_fn));
fs.writeFile(_fn, JSON.stringify(data[idx]), 'utf-8', function (error) {
evt.emit(idx, error);
});
});
})();
}
});
}, cfg);
};
/* }}} */
/* {{{ public function removeAllCache() */
_me.removeAllCache = function () {
_caches = {};
};
/* }}} */
return _me;
};