sqlite3-cluster.js/client.js

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'use strict';
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/*global Promise*/
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// TODO iterate over the prototype
// translate request / response
var sqlite3real = require('sqlite3');
/*
function createConnection(opts) {
var server = ;
return server.create(opts).then(function () {
// created and listening
});
}
*/
function startServer(opts) {
return require('./server').create(opts).then(function (server) {
// this process doesn't need to connect to itself
// through a socket
return server.masterClient;
});
}
function getConnection(opts) {
return new Promise(function (resolve) {
setTimeout(function () {
var WebSocket = require('ws');
var ws = new WebSocket('ws+unix:' + opts.sock);
if (opts.serve) {
console.log("[EXPLICIT SERVER] #################################################");
return startServer(opts).then(function (client) {
// ws.masterClient = client;
resolve({ masterClient: client });
});
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}
ws.on('error', function (err) {
console.error('[ERROR] ws connection failed, retrying');
console.error(err);
function retry() {
setTimeout(function () {
getConnection(opts).then(resolve);
}, 100 + (Math.random() * 250));
}
if (!opts.connect && ('ENOENT' === err.code || 'ECONNREFUSED' === err.code)) {
console.log('[NO SERVER] attempting to create a server #######################');
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return startServer(opts).then(function (client) {
// ws.masterClient = client;
resolve({ masterClient: client });
}, function () {
retry();
});
}
retry();
});
ws.on('open', function () {
resolve(ws);
});
});
}, 100 + (Math.random() * 250));
}
function create(opts) {
if (!opts.sock) {
opts.sock = opts.filename + '.sock';
}
var promise;
var numcpus = require('os').cpus().length;
if (opts.standalone || (1 === numcpus && !opts.serve && !opts.connect)) {
return require('./wrapper').create(opts);
}
function retryServe() {
return startServer(opts).then(function (client) {
// ws.masterClient = client;
return { masterClient: client };
}, function () {
retryServe();
});
}
if (opts.serve) {
console.log('[EXPLICIT]');
promise = retryServe();
} else {
promise = getConnection(opts);
}
/*
if (opts.connect) {
}
*/
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// TODO maybe use HTTP POST instead?
return promise.then(function (ws) {
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if (ws.masterClient) {
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console.log('[MASTER CLIENT] found');
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return ws.masterClient;
}
var db = {};
var proto = sqlite3real.Database.prototype;
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var messages = [];
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function rpc(fname, args) {
var id;
var cb;
if ('function' === typeof args[args.length - 1]) {
id = Math.random();
cb = args.pop();
}
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console.log('fname, args');
console.log(fname, args);
ws.send(JSON.stringify({
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type: 'rpc'
, func: fname
, args: args
, filename: opts.filename
, id: id
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}));
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if (!cb) {
return;
}
function onMessage(data) {
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var cmd;
try {
cmd = JSON.parse(data.toString('utf8'));
} catch(e) {
console.error('[ERROR] in client, from sql server parse json');
console.error(e);
console.error(data);
console.error();
//ws.send(JSON.stringify({ type: 'error', value: { message: e.message, code: "E_PARSE_JSON" } }));
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return;
}
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if (cmd.id !== id) {
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return;
}
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//console.log('onMessage data');
//console.log(cmd);
cb.apply(cmd.this, cmd.args);
if ('on' !== fname) {
var index = messages.indexOf(onMessage);
messages.splice(index, 1);
}
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}
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messages.push(onMessage);
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}
db.sanitize = require('./wrapper').sanitize;
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db.escape = require('./wrapper').escape;
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Object.keys(sqlite3real.Database.prototype).forEach(function (key) {
if ('function' === typeof proto[key]) {
db[key] = function () {
rpc(key, Array.prototype.slice.call(arguments));
};
}
});
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ws.on('message', function (data) {
messages.forEach(function (fn) {
try {
fn(data);
} catch(e) {
// ignore
}
});
});
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// serialize
// parallel
db.serialize = db.parallel = function () {
throw new Error('NOT IMPLEMENTED in SQLITE3-remote');
};
return db;
});
}
module.exports.sanitize = require('./wrapper').sanitize;
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module.exports.escape = require('./wrapper').escape;
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module.exports.create = create;