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index.js
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index.js
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var Stream = require('stream');
var url = require('url');
var qs = require('querystring');
var parseURL = url.parse;
var METHODS = 'get head post put del'.split(' ');
var HTTP_METHODS = 'GET HEAD POST PUT DELETE'.split(' ');
var BLACKLIST = {expect:1,host:1};
var Request = function(options) {
this.writable = true;
this.readable = true;
this.method = options.method || 'GET';
this.headers = options.headers || {};
this.url = options.path; // we name it url as it's called url on http.ServerRequest
this.agent = options.agent;
this.bytesWritten = 0;
this.maxRedirects = 20;
this.retries = options.retries || 0;
this.request = null;
this.response = null;
this._options = options;
this._encoding = null;
this._paused = false;
this._open = false;
this._piping = false;
var self = this;
this.once('pipe', function(from) {
self._piping = true;
if (from.headers) {
Object.keys(from.headers).forEach(function(name) {
if (!from.headers[name] || BLACKLIST[name]) return;
self.headers[name] = self.headers[name] || from.headers[name];
});
}
if (typeof from.length === 'number') {
self.headers['content-length'] = self.headers['content-length'] || from.length;
}
});
process.nextTick(function() {
if (self._piping || self.bytesWritten || !self.writable) return;
self.headers['content-length'] = 0;
self.end();
});
};
Request.prototype.__proto__ = process.EventEmitter.prototype;
Request.prototype.setEncoding = function(encoding) {
if (this.response) {
this.response.setEncoding(encoding);
} else {
this._encoding = encoding;
}
return this;
};
Request.prototype.setHeader = function(name, val) {
this.headers[name.toLowerCase()] = val;
return this;
};
Request.prototype.pipe = function(dest, opt) {
this.once('response', function(res) {
if (!dest.setHeader) return;
Object.keys(res.headers).forEach(function(name) {
if (dest.getHeader && dest.getHeader(name) || BLACKLIST[name]) return;
dest.setHeader(name, res.headers[name]);
});
dest.statusCode = res.statusCode;
});
return Stream.prototype.pipe.apply(this, arguments);
};
Request.prototype.write = function(a,b) {
this.bytesWritten += a.length;
return this._request().write(a,b);
};
Request.prototype.end = function(a,b) {
this.writable = false;
return this._request().end(a,b);
};
Request.prototype.destroy = function() {
this.retries = 0;
if (this.request) {
this.request.abort();
}
this.finish('close');
};
Request.prototype.pause = function() {
if (this.response) return this.response.pause();
this._paused = true;
};
Request.prototype.resume = function() {
if (this.response) return this.response.resume();
this._paused = false;
};
Request.prototype.finish = function(name, val) {
if (!this.readable) return;
this.readable = this.writable = false;
this.emit(name, val);
};
Request.prototype.retry = function() {
var self = this;
if (!this.retries || this._open) return false;
this.retries--;
setTimeout(function() {
if (!self.readable) return;
self._send(true).end();
}, 5000);
return true;
};
Request.prototype._send = function(silent) {
this._options.method = this.method;
this._options.headers = this.headers;
this._options.agent = this.agent;
this._options.path = this.url;
var self = this;
var lib = this._options.protocol === 'http:' ? require('http') : require('https');
var request = this.request = lib.request(this._options);
request.on('response', function(res) {
if (res.statusCode >= 300 && res.statusCode < 400 && res.headers.location) {
if (!self.maxRedirects--) return self.finish('close', new Error('too many redirects'));
self._options = parseURL(res.headers.location);
self._send(true).end();
return;
}
self.retries = 0;
self.response = res;
self.emit('response', res);
if (self._paused) {
res.pause();
}
if (self._encoding) {
res.setEncoding(self._encoding);
}
res.on('data', function(data) {
if (!self.readable) return;
self.emit('data', data);
});
res.on('end', function() {
self.finish('end');
});
res.on('close', function() {
self.finish('close');
});
});
request.on('close', function() {
if (request !== self.request) return;
self.finish('close');
});
request.on('error', function(err) {
if (request !== self.request) return;
if (!self.retry()) return self.finish('close', err);
request = null;
});
request.on('drain', function() {
if (request !== self.request) return;
self.emit('drain');
});
if (silent) return request;
this.emit('request', request);
return request;
};
Request.prototype._request = function() {
if (!this._open) {
this._open = true;
this.emit('open');
}
return this.request || this._send();
};
var send = function(options) {
options.method = options.method || 'GET';
options.url = options.url.indexOf('://') === -1 ? 'http://'+options.url : options.url;
options.query = options.query || options.qs;
if (options.query) {
options.url += (options.url.indexOf('?') === -1 ? '?' : '&') + qs.stringify(options.query);
}
var parsed = parseURL(options.url);
var body = options.body;
parsed.retries = options.retry === true ? 5 : options.retry;
parsed.method = options.method;
parsed.headers = options.headers || {};
parsed.agent = options.agent;
if (options.pool || options.pool === false) {
parsed.agent = options.pool;
}
if (options.form) {
parsed.headers['content-type'] = 'application/x-www-form-urlencoded; charset=utf-8';
body = qs.stringify(options.form);
}
if (options.json) {
if (options.method !== 'GET' && options.method !== 'HEAD') {
parsed.headers['content-type'] = 'application/json; charset=utf-8';
body = JSON.stringify(typeof options.json !== 'boolean' ? options.json : body);
}
parsed.headers.accept = 'application/json';
}
if (body) {
parsed.headers['content-length'] = Buffer.isBuffer(body) ? body.length : Buffer.byteLength(body);
}
var request = new Request(parsed);
if (body) {
request.write(body);
request.end();
}
if (!options.callback || options.buffer === false) return request;
var buffer = '';
request.setEncoding('utf-8');
request.on('data', function(data) {
buffer += data;
});
request.once('end', function() {
request.response.body = buffer;
if (!options.json) return options.callback(null, request.response, buffer);
try {
request.response.body = buffer = JSON.parse(buffer);
} catch (err) {
return options.callback(err);
}
options.callback(null, request.response, buffer);
});
request.once('close', function(err) {
options.callback(err || new Error('premature close'));
});
return request;
};
var transform = function(url, options, callback) {
if (url && typeof url === 'object') return transform(url.url, url, options);
if (typeof options === 'function') return transform(url, {}, options);
options = options || {};
options.callback = options.callback || callback;
options.url = url;
return options;
};
var use = function(fn) {
var curly = function(url, options, callback) {
return fn(transform(url, options, callback));
};
curly.use = use;
METHODS.forEach(function(method, i) {
var verb = HTTP_METHODS[i];
curly[method] = curly[verb] = function(url, options, callback) {
options = transform(url, options, callback);
options.method = verb;
return fn(options);
};
});
return curly;
};
module.exports = use(send);