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moonridge.js
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moonridge.js
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'use strict'
const RPC = require('socket.io-rpc')
const _ = require('lodash')
// const debug = require('debug')('moonridge:server')
const MRModel = require('./mr-server-model')
const debug = require('debug')('moonridge:main')
var userModel
var moonridgeSingleton
const baucis = require('./utils/baucis')
const models = {}
const mongoose = require('mongoose')
const defaultOpts = {
server: {
socketOptions: { keepAlive: 1 }
},
replset: {
socketOptions: { keepAlive: 1 }
}
}
/**
* @param {String} connString to mongoDB
* @param {Object} opts connection options
* @returns {{model: regNewModel, userModel: registerUserModel, authUser: authUser, bootstrap: createServer}} moonridge
* instance which allows to register models and bootstrap itself
*/
function connect (connString, opts) {
_.merge(defaultOpts, opts)
mongoose.connect(connString, defaultOpts, function (err) {
if (err) {
throw err
} else {
console.log(`connected to mongo ${connString} succesfully`)
}
})
mongoose.connection.on('error', function (err) {
console.error('MongoDB error: %s', err)
})
}
/**
* @param {String} name
* @param {Object} schema
* @param {Object} opts
* @param {Function} [opts.checkPermission] function which should return true/false depending if the connected socket has/hasn't priviliges
* @param {Object} [opts.permissions] with 4 properties: 'C', 'R','U', 'D' which each represents one type of operation,
* values should be numbers indicating which level of privilige is needed
* @returns {MRModel}
*/
function regNewModel (name, schema, opts) {
var model = MRModel.apply(moonridgeSingleton, arguments)
models[name] = model
return model
}
/**
*
* @param schemaExtend
* @param {Object} opts
* @returns {MRModel}
*/
function registerUserModel (schemaExtend, opts) {
if (userModel) { // if it was already assigned, we throw
throw new Error('There can only be one user model and it was already registered')
}
var userSchema = require('./utils/user-model-base')
_.extend(userSchema, schemaExtend)
userModel = MRModel.call(moonridgeSingleton, 'user', userSchema, opts)
models['user'] = userModel
return userModel
}
/**
* Shares the same signature as express.js listen method, because it passes arguments to it
* @param {Number} port
* @param {String} [hostname]
* @param {Function} [Callback]
* @returns {{rpcNsp: (Emitter), io: {Object}, server: http.Server}}
*/
function bootstrap () {
var server = RPC.apply(null, arguments)
var io = server.io
var allQueries = []
Object.keys(models).forEach(function (modelName) {
var model = models[modelName]
model._exposeCallback(server)
})
io.use(function (socket, next) {
const registeredLQs = {}
socket.moonridge = {
registeredLQs: registeredLQs,
user: {privilege_level: 0}
} // default privilege level for any connected client
socket.on('disconnect', function () {
// clearing out liveQueries listeners
debug(socket.id, ' socket disconnected, cleaning up LQ listeners')
for (var LQId in registeredLQs) {
var LQ = registeredLQs[LQId]
LQ.removeListener(socket)
}
})
next()
})
server.expose({
MR: {
getModels: function () {
return Object.keys(models)
},
deAuthorize: function () {
this.moonridge.user = {privilege_level: 0} // for logging users out
}
}
})
if (process.env.MOONRIDGE_HEALTH === '1') {
// this reveals any data that you use in queries to the public, so it should not be used in production when dealing with sensitive data
server.expose({
MR: {
getHealth: function () {
var allModels = {}
var index = allQueries.length
while (index--) {
var modelQueriesForSerialization = {}
var model = allQueries[index]
for (var LQ in model.queries) {
modelQueriesForSerialization[LQ] = Object.keys(model.queries[LQ].listeners).length
}
allModels[model.modelName] = modelQueriesForSerialization
}
return {
pid: process.pid,
memory: process.memoryUsage(),
uptime: process.uptime(), // in seconds
liveQueries: allModels // key is LQ.clientQuery and value is number of listening clients
}
}
}
})
}
return server
}
moonridgeSingleton = {
model: regNewModel,
userModel: registerUserModel,
bootstrap: bootstrap,
mongoose: mongoose,
models: models,
connect: connect,
baucis: baucis
}
module.exports = moonridgeSingleton