110 lines
2.1 KiB
JavaScript
110 lines
2.1 KiB
JavaScript
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/**
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* Module dependencies.
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*/
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var url = require('./url');
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var parser = require('socket.io-parser');
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var Manager = require('./manager');
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var debug = require('debug')('socket.io-client');
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/**
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* Module exports.
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*/
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module.exports = exports = lookup;
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/**
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* Managers cache.
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*/
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var cache = exports.managers = {};
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/**
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* Looks up an existing `Manager` for multiplexing.
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* If the user summons:
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*
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* `io('http://localhost/a');`
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* `io('http://localhost/b');`
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*
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* We reuse the existing instance based on same scheme/port/host,
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* and we initialize sockets for each namespace.
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*
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* @api public
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*/
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function lookup (uri, opts) {
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if (typeof uri === 'object') {
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opts = uri;
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uri = undefined;
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}
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opts = opts || {};
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var parsed = url(uri);
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var source = parsed.source;
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var id = parsed.id;
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var path = parsed.path;
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var sameNamespace = cache[id] && path in cache[id].nsps;
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var newConnection = opts.forceNew || opts['force new connection'] ||
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false === opts.multiplex || sameNamespace;
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var io;
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if (newConnection) {
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debug('ignoring socket cache for %s', source);
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io = Manager(source, opts);
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} else {
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if (!cache[id]) {
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debug('new io instance for %s', source);
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cache[id] = Manager(source, opts);
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}
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io = cache[id];
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}
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if (parsed.query && !opts.query) {
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opts.query = parsed.query;
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} else if (opts && 'object' === typeof opts.query) {
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opts.query = encodeQueryString(opts.query);
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}
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return io.socket(parsed.path, opts);
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}
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/**
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* Helper method to parse query objects to string.
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* @param {object} query
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* @returns {string}
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*/
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function encodeQueryString (obj) {
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var str = [];
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for (var p in obj) {
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if (obj.hasOwnProperty(p)) {
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str.push(encodeURIComponent(p) + '=' + encodeURIComponent(obj[p]));
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}
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}
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return str.join('&');
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}
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/**
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* Protocol version.
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*
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* @api public
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*/
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exports.protocol = parser.protocol;
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/**
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* `connect`.
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*
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* @param {String} uri
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* @api public
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*/
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exports.connect = lookup;
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/**
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* Expose constructors for standalone build.
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*
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* @api public
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*/
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exports.Manager = require('./manager');
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exports.Socket = require('./socket');
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