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95 lines
2.1 KiB
JavaScript
95 lines
2.1 KiB
JavaScript
7 years ago
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define([
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], function () {
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var Wire = {};
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/* MISSION: write a generic RPC framework
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Requirements
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* some transmission methods can be interrupted
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* handle disconnects and reconnects
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* handle callbacks
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* configurable timeout
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* Service should expose 'addClient' method
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* and handle broadcast
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*
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*/
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var uid = function () {
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return Number(Math.floor(Math.random () *
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Number.MAX_SAFE_INTEGER)).toString(32);
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};
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/*
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opt = {
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send: function () {
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},
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receive: function () {
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},
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constructor: function (cb) {
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cb(void 0 , {
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send: function (content, cb) {
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},
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receive: function () {
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}
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});
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},
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};
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*/
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Wire.create = function (opt, cb) {
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var ctx = {};
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var pending = ctx.pending = {};
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ctx.connected = false;
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var rpc = {};
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opt.constructor(function (e, service) {
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if (e) { return setTimeout(function () { cb(e); }); }
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rpc.send = function (type, data, cb) {
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var txid = uid();
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if (typeof(cb) !== 'function') {
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throw new Error('expected callback');
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}
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ctx.pending[txid] = function (err, response) {
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cb(err, response);
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};
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service.send(JSON.stringify({
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txid: txid,
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message: {
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command: type,
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content: data,
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},
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}));
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};
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service.receive(function (raw) {
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try {
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var data = JSON.parse(raw);
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var txid = data.txid;
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if (!txid) { throw new Error('NO_TXID'); }
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var cb = pending[txid];
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if (data.error) { return void cb(data.error); }
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cb(void 0, data.content);
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} catch (e) { console.error("UNHANDLED_MESSAGE", data); }
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});
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cb(void 0, rpc);
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});
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};
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return Wire;
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});
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