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| var http = require("http"),
logger = require("./logger"),
fs = require("fs"),
vaticanResp = require("./vaticanResponse"),
handlerParser = require("./handlerParser"),
processingChain = require("./processingChain"),
mongoose = require("mongoose"),
_ = require("lodash");
module.exports = Vatican;
var CONFIG_FILE_PATH = process.cwd() + "/vatican-conf.json";
var DEFAULT_CONFIG = {
cors: false,
db: {
host: 'localhost',
dbname: 'vatican-project'
}
}
function Vatican(options) {
var config = null;
this.dbconn = null
try {
config = (options) ? options : require(CONFIG_FILE_PATH);
} catch(ex) {
logger.error("Error loading config file '" + CONFIG_FILE_PATH + "': " + ex);
return;
}
this.options = _.defaults( config, DEFAULT_CONFIG);
this.checkOptions();
this.requestParser = config.requestParser ? require(config.requestParser) : require("./defaultRequestParser");
this.handlers = {};
this.parseHandlers();
this.paths = [];
this.server = null;
this.totalPreprocessors = 0;
this.preprocessors = new processingChain();
this.postprocessors = new processingChain();
}
Vatican.prototype.preprocess = function(fn, endpointNames) {
this.preprocessors.add({fn: fn, names: endpointNames ? endpointNames : []})
this.totalPreprocessors = this.preprocessors.getTotal();
}
Vatican.prototype.postprocess = function(fn, endpointNames) {
this.postprocessors.add({fn: fn, names: endpointNames ? endpointNames : []});
}
Vatican.prototype.parseHandlers = function(cb) {
var dir = this.options.handlers;
var self = this;
handlerParser.parse(dir, function(err, path) {
Iif(typeof cb == 'function' && err) return cb(err)
Eif(!err) {
self.paths = path;
}
if(typeof cb == 'function') cb(self.paths)
})
};
/**
Makes sure that the required options are there
*/
Vatican.prototype.checkOptions = function() {
if( !this.options.port ) {
logger.error("Port not specified, throwing error!");
throw new Error("Port not specified");
}
if( !this.options.handlers ) {
logger.error("Handlers folder not specified, throwing error!");
throw new Error("Handlers folder not specified");
}
};
Vatican.prototype.parseRequest = function( req, template, originalReq , cb) {
this.requestParser.parse(req, template, originalReq, cb);
};
/**
Checks all paths until one that matches the current url is found.
If there is no match, then false is returned
*/
Vatican.prototype.findMethod = function( url, method ) {
var path = (url.indexOf("?") == -1) ? url : url.split("?")[0];
var nmbrOfParts = path.split("/").length;
var nmbrOfPartsPath = null,
regExpStr = null,
regExp = null
var match = _.find(this.paths, function(item) {
regExpStr = item.url.replace(/\:.+(\/)?/g,".+$1");
nmbrOfPartsPath = item.url.split("/").length;
regExp = new RegExp(regExpStr + "$");
return nmbrOfPartsPath == nmbrOfParts && (item.method.toLowerCase() === method.toLowerCase()) && regExp.test(path);
});
return match;
};
/*
Adds usefull methods and properties to node's original request object.
Note: Right now, there is nothing to be added, but I left the method here in case
I think of something in the future.
*/
Vatican.prototype.createRequest = function(req) {
return req;
};
/*
Reads the handler code, comments out the annotation, then
loads the code as a require would and finally returns the new
handler instance
*/
Vatican.prototype.loadHandler = function(path) {
var key = new Buffer(path).toString('base64')
Iif(this.handlers[key]) return this.handlers[key];
var Module = module.constructor
var m = new Module();
var handlerContent = fs.readFileSync(path);
handlerContent = handlerContent.toString().replace(/(@endpoint.+\n)/g,"//$1");
m.paths = module.paths;
try {
m._compile(handlerContent, path);
this.handlers[key] = m.exports;
} catch (ex) {
logger.error("Error compiling handler: ", ex)
}
return this.handlers[key];
};
/**
Handles each request, by looking up the right handler/method to execute
*/
Vatican.prototype.requestHandler = function (req, res) {
logger.info("Request received: [" + req.method + "]: " + req.url);
var self = this;
var methodFound = this.findMethod(req.url, req.method);
if( !methodFound ) {
vaticanResp.writeNotFound(res);
} else {
try {
var request = this.createRequest(req);
var hdlr = this.loadHandler(process.cwd() + "/" + methodFound.handlerPath);
res = vaticanResp.improveResponse(res, request, this.options, this.postprocessors);
//Parse the request to grab the parameters
this.parseRequest(request, methodFound.url, req, function(newRequest) {
//Run the pre-process chain and finally, call the handler
if(self.preprocessors.getTotal() > self.totalPreprocessors) {
self.preprocessors.pop();
}
var hdlrInstance = new hdlr(self.getCorrectModel(methodFound))
hdlrInstance.models = self.dbmodels //Let the handler access all other models in case they're neeeded
self.preprocessors.add({fn: hdlrInstance[methodFound.action].bind(hdlrInstance)})
self.preprocessors.runChain(newRequest, res, null, methodFound);
});
} catch (ex) {
logger.error("Error instantiating handler: " + ex.message);
logger.error("Stacktrace: " + ex.stack);
res.end();
}
}
};
Vatican.prototype.getCorrectModel = function(handler) {
Iif(this.dbmodels) {
var modelName = handler.handlerName.replace("Hdlr", '')
return this.dbmodels[modelName]
}
return false
}
/**
Starts up the server
*/
Vatican.prototype.start = function(cb) {
try {
this.server = http.createServer(this.requestHandler.bind(this));
this.server.listen(this.options.port);
logger.info("Server started on port: " + this.options.port);
if(typeof cb == 'function') {
cb();
}
} catch (ex) {
logger.error("Error creating server: " + ex.message);
return false;
}
};
Vatican.prototype.__dbStart = function(first_argument) {
var connString = 'mongodb://' + this.options.db.host + '/' + this.options.db.dbname
mongoose.connect(connString)
return mongoose.connection
};
Vatican.prototype.dbStart = function(opts, cb) {
Iif(typeof opts === 'function') {
cb = opts
opts = {}
}
var self = this
var schemasFolder = opts.schemasFolder || process.cwd() + '/schemas'
self.dbconn = this.__dbStart()
self.dbconn.on('error', cb)
self.dbconn.once('open', function() {
self.loadDbModels(schemasFolder, function(err, models) {
Iif(err) {
return cb(err)
}
self.dbmodels = models
cb()
})
})
}
Vatican.prototype.loadDbModels = function(folder, cb) {
var models = {}
var self = this
fs.readdir(folder, function(err, files) {
Iif(err) return cb(err)
var path = null, tmp = null
files.forEach(function(f) {
path = folder + "/" + f
tmp = require(path)(mongoose)
models[tmp.modelName] = tmp
})
cb(null, models)
})
}
|