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solr.js
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solr.js
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var http = require('http');
var querystring = require('querystring');
var util = require('util');
var events = require('events');
var DEFAULTS = {
host: '127.0.0.1',
port: '8983',
core: '', // if defined, should begin with a slash
path: '/solr' // should also begin with a slash
};
function Client(options) {
options = options || {};
this.options = merge(options, DEFAULTS);
};
exports.Client = Client;
util.inherits(Client, events.EventEmitter);
Client.prototype.request = function(options, callback) {
var client = this;
options = options || {};
options = merge(options, client.options);
if (!options.headers) options.headers = {};
options.headers.host = options.host + ':' + options.port;
var buffer = '';
var request = http.request(options, function(response) {
response.on('data', function(chunk) {
buffer += chunk;
});
response.on('end', function() {
if (response.statusCode !== 200) {
var err = new Error(exports.getError(buffer));
callback(err);
} else {
callback(null, buffer);
}
});
});
request.on('error', function (e) {
client.emit('error', e);
callback(e);
});
if (options.data) {
request.write(options.data, options.requestEncoding || 'utf8');
}
request.end();
};
Client.prototype.get = function(getPath, callback) {
var options = {
method: 'GET',
path: this.options.path + this.options.core + '/' + getPath
};
this.request(options, callback || noop);
};
Client.prototype.post = function(postPath, data, callback) {
var options = {
method: 'POST',
path: this.options.path + this.options.core + '/' + postPath,
headers: {
'Content-Length': Buffer.byteLength(data),
'Content-Type': 'text/xml'
},
data: data
};
this.request(options, callback || noop);
};
Client.prototype.update = function(data, callback) {
this.post("update", data, callback);
};
Client.prototype.add = function(doc, options, callback) {
if (callback === undefined) {
callback = options;
options = {};
}
options = options || {};
var addParams = {};
if (options.overwrite !== undefined) {
addParams["overwrite"] = Boolean(options.overwrite);
}
if (options.commitWithin !== undefined) {
addParams["commitWithin"] = options.commitWithin;
}
if (options.commit !== undefined) {
addParams["commit"] = Boolean(options.commit);
}
var data = "<add>";
var docs = Array.isArray(doc) ? doc : [doc];
for (var i = 0; i < docs.length; i++) {
data += "<doc>";
var doc = docs[i];
for (var field in doc) if (doc.hasOwnProperty(field)) {
var value = doc[field];
if (!Array.isArray(value)) {
data += serializeScalar(field, value);
} else {
data += serializeList(field, value);
}
}
data += "</doc>";
}
data += "</add>";
this.update(data, callback);
};
Client.prototype.del = function(id, query, callback) {
var data = "<delete>";
if (id) {
if (Array.isArray(id)) {
for (var i=0; i<id.length; i++) {
data = data + "<id>" + id[i] + "</id>";
}
} else {
data = data + "<id>" + id + "</id>";
}
}
if (query) {
if (Array.isArray(query)) {
for (var i=0; i<query.length; i++) {
data = data + "<query>" + query[i] + "</query>";
}
} else {
data = data + "<query>" + query + "</query>";
}
}
data = data + "</delete>";
this.update(data, callback);
};
Client.prototype.query = function(query, options, callback) {
if (callback === undefined) {
callback = options;
options = {};
}
var queryParams = options || {};
queryParams.q = query;
queryParams.wt = "json";
this.get("select?" + querystring.stringify(queryParams), callback);
};
Client.prototype.commit = function(callback) {
var data = "<commit/>";
this.update(data, callback);
};
Client.prototype.optimize = function(callback) {
var data = "<optimize/>";
this.update(data, callback);
};
Client.prototype.rollback = function(callback) {
var data = "<rollback/>";
this.update(data, callback);
};
// parse status from xml response
exports.getStatus = function(statusMessage) {
if (!statusMessage) {
return 1;
}
var statusTag = '<int name="status">';
return statusMessage.charAt(statusMessage.indexOf(statusTag) +
statusTag.length);
};
// parse error from html response
exports.getError = function(errorMessage) {
var err = errorMessage.match(/<pre>([\s\S]+)<\/pre>/);
return (err || ['', errorMessage])[1].trim();
};
// escape dangerous characters in query values
exports.valueEscape = function(query) {
return query.replace(/\\?([&|+\-!(){}[\]^"~*?\:]{1})/g, function(str, c) {
return '\\' + c;
});
}
// main export function
exports.createClient = function(options) {
var client = new Client(options);
return client;
};
// Helper functions
// callback || noop borrowed from node/lib/fs.js
function noop() {};
function escapeXml(str) {
return str.replace(/&/gm, '&')
.replace(/</gm, '<')
.replace(/>/gm, '>')
.replace(/\'/gm, ''')
.replace(/\"/gm, '"');
};
function merge(a, b){
if (a && b) {
for (var key in b) {
if (typeof a[key] == 'undefined') {
a[key] = b[key];
} else if (typeof a[key] == 'object' && typeof b[key] == 'object') {
a[key] = merge(a[key], b[key]);
}
}
}
return a;
};
function serializeScalar(field, value) {
value = '' + value;
return '<field name = "' + field + '">' + escapeXml(value) + '</field>';
};
function serializeList(field, list) {
var data = '';
list.forEach(function(value) {
if (!Array.isArray(value)) {
data += serializeScalar(field, value);
}
});
return data;
};