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index.js
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index.js
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const http = require('http');
const url = require('url');
const zlib = require('zlib');
// utils
const isJSON = require('./util').isJSON;
const extend = require('./util').extend;
const nklient = {};
const keepAliveAgent = new http.Agent({ keepAlive: true });
// TODO: move this to seperate file (much like handler - inject params)
let client = (params, resolve, reject) => {
let reqURI = url.parse(params.uri);
var settings = {
host: reqURI.hostname,
port: reqURI.port || 80,
path: params.newPath || reqURI.pathname,
headers: params.headers || {},
method: params.method || 'GET'
};
if (params.postData){
settings.params = params.postData;
settings.headers['Content-Length'] = params.postData.length;
};
let req = http.request(settings);
if (settings.params) { req.write(settings.params); }
if (params.timeout) {
req.setTimeout(params.timeout, () => {
let err = new Error('ETIMEDOUT');
err.code = 'ETIMEDOUT';
reject(err);
});
}
req.on('response', function(res){
if (res.statusCode >= 300 && res.statusCode < 400 && 'location' in res.headers) {
let newPath = res.headers.location;
params.newPath = newPath;
return client(params, resolve, reject);
}
let chunks = [];
// concat chunks
res.on('data', (chunk) => {
chunks.push(chunk);
});
// when the response has finished
res.on('end', () => {
res.body = Buffer.concat(chunks);
let encoding = res.headers['content-encoding'];
if (encoding === 'gzip') {
zlib.gunzip(res.body, (err, decoded) => {
if (err) { reject(err); }
res.body = decoded && isJSON(decoded) ? JSON.parse(decoded.toString()) : decoded.toString();
resolve(res)
});
} else if (encoding === 'deflate') {
zlib.inflate(res.body, (err, decoded) => (err, decoded) => {
if (err) { reject(err); }
res.body = decoded && isJSON(decoded) ? JSON.parse(decoded.toString()) : decoded.toString();
resolve(res)
});
} else {
res.body = res.body.toString();
res.body = isJSON(res.body) ? JSON.parse(res.body) : res.body;
resolve(res);
}
});
});
// when err'd out
req.on('error', (e) => reject(e));
// end the request
req.end();
}
let initParams = (uri, options) => {
let params = {};
if (typeof options === 'object') {
options.uri = uri;
return extend(params, options);
} else if (typeof uri === 'string') {
return extend(params, {uri: uri});
}
return extend(params, uri);
}
let verbFunc = (verb) => {
let method = verb.toUpperCase();
return (uri, options) => {
nklient.options = extend(initParams(uri, options), {method});
return nklient;
}
}
nklient.get = verbFunc('get');
nklient.head = verbFunc('head');
nklient.post = verbFunc('post');
nklient.put = verbFunc('put');
nklient.patch = verbFunc('patch');
nklient.del = verbFunc('delete');
nklient.headers = (key, val) => {
let headers = nklient.options.headers || {};
headers[key] = val;
extend(nklient.options, {headers});
return nklient;
};
nklient.postBody = (body, encoding) => {
if (typeof body === 'string' || body instanceof String) {
extend(nklient.options, { postData: body, encoding: encoding || 'utf-8' })
} else {
extend(nklient.options, { postData: JSON.stringify(body), encoding: encoding || 'utf-8' })
}
return nklient;
}
nklient.timeout = (timeout) => {
extend(nklient.options, {timeout});
return nklient;
}
nklient.exec = () => new Promise((resolve, reject) => client(nklient.options, resolve, reject));
module.exports = nklient;