Add node dapi HTTP implementation
* src/dapi/http/HttpError.js: Add error subtype. * src/dapi/http/NodeHttpImpl.js: Add node-based HTTP impl. * test/dapi/http/HttpErrorTest.js: Add test. * test/dapi/http/NodeHttpImplTest.js: Add test.master
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/**
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* Error representing non-200 HTTP status code
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*
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* Copyright (C) 2017 R-T Specialty, LLC.
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*
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* This file is part of the Liza Data Collection Framework.
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*
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* liza is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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'use strict';
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const { Class } = require( 'easejs' );
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/**
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* Represents error in performing HTTP request
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*/
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module.exports = Class( 'HttpError' )
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.extend( Error,
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{
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/**
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* HTTP status code
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* @type {number}
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*/
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'public statuscode': 500,
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/**
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* Set error message and HTTP status code
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*
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* The HTTP status code defaults to 500 if not set. No check is
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* performed to determine whether the given status code is a valid error
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* code.
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*
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* The mesage is _not_ automatically set from the status code.
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*
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* @param {string} message error message
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* @param {number=} statuscode HTTP status code
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*/
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__construct( message, statuscode )
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{
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this.statuscode = statuscode || 500;
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},
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} );
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/**
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* HTTP over Node.js-compatible API
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*
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* Copyright (C) 2017 R-T Specialty, LLC.
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*
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* This file is part of the Liza Data Collection Framework.
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*
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* liza is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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'use strict';
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const { Class } = require( 'easejs' );
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const HttpImpl = require( './HttpImpl' );
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const HttpError = require( './HttpError' );
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/**
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* HTTP adapter using Node.js-compatible objects (e.g. its `http` modules)
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*/
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module.exports = Class( 'NodeHttpImpl' )
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.implement( HttpImpl )
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.extend(
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{
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/**
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* Clients for desired protocols (e.g. HTTP(s))
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* @type {Object}
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*/
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'private _protoHandlers': {},
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/**
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* URL parser
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* @type {url}
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*/
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'private _urlParser': '',
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/**
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* Initialize with protocol handlers and URL parser
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*
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* `proto_handlers` must be a key-value mapping of the protocol string
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* to a handler object conforming to Node's http(s) APIs---that is, it
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* should provide a `#request` method.
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*
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* @param {Object} proto_handlers protocol handler key-value map
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* @param {Object} url_parser URL parser
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*/
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constructor( proto_handlers, url_parser )
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{
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this._protoHandlers = proto_handlers;
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this._urlParser = url_parser;
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},
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/**
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* Perform HTTP request
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*
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* If the request is synchronous, it must still return the data via the
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* provided callback. The provided data is expected to be key-value if an
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* object is given, otherwise a string of binary data.
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*
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* @param {string} url destination URL
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* @param {string} method RFC-2616-compliant HTTP method
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* @param {Object|string} data request params
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* @param {function(?Error, ?string)} callback server response callback
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*
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* @return {HttpImpl} self
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*/
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'public requestData'( url, method, data, callback )
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{
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const options = this._urlParser.parse( url );
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const protocol = options.protocol.replace( /:$/, '' );
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const handler = this._protoHandlers[ protocol ];
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if ( !handler )
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{
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throw Error( `No handler for ${protocol}` );
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}
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this._setOptions( options, method, data );
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let forbid_end = false;
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const req = handler.request( options, res =>
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{
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let data = '';
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res.on( 'data', chunk => data += chunk );
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res.on( 'end', () =>
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!forbid_end && this.requestEnd( res, data, callback )
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);
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} );
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req.on( 'error', e =>
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{
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this.serveError( e, null, null, callback );
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// guarantee that the callback will not be invoked a second time
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// if something tries to end the request
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forbid_end = true;
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} );
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if ( method === 'POST' )
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{
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req.write( data );
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}
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req.end();
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},
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/**
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* Set request options
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*
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* @param {Object} options request options
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* @param {string} method HTTP method
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* @param {string} data request data
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*
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* @return {Object} request headers
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*/
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'private _setOptions'( options, method, data )
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{
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const { headers = {} } = options;
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options.method = method;
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if ( method === 'POST' )
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{
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headers[ 'Content-Type' ] = 'application/x-www-form-urlencoded';
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options.headers = headers;
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}
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else
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{
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if ( data )
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{
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options.path += '?' + data;
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}
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}
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},
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/**
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* Invoked when a request is completed
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*
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* Subtypes may override this method to handle their own request
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* processing before the continuation `callback` is invoked with the
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* final data.
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*
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* To override only error situations, see `#serveError`.
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*
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* @param {Object} res Node http.ServerResponse
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* @param {string} data raw response data
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* @param {function(?Error,?string)} callback completion continuation
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*
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* @return {undefined}
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*/
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'virtual protected requestEnd'( res, data, callback )
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{
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if ( !this.isSuccessful( res ) )
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{
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this.serveError(
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HttpError( res.statusMessage, res.statusCode ),
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res,
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data,
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callback
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);
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return;
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}
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callback( null, data );
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},
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/**
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* Predicate to determine whether HTTP request was successful
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*
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* Non-2xx status codes represent failures.
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*
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* @param {Object} res Node http.ServerResponse
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*
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* @return {boolean} whether HTTP status code represents a success
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*/
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'virtual protected isSuccessful'( res )
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{
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return ( +res.statusCode >= 200 ) && ( +res.statusCode < 300 );
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},
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/**
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* Invoke continuation `callback` with an error `e`
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*
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* @param {Error} e error
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* @param {Object} res Node http.ServerResponse
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* @param {string} data raw response data
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* @param {function(?Error,?data)} callback continuation
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*
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* @return {undefined}
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*/
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'virtual protected serveError'( e, res, data, callback )
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{
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callback( e, data );
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},
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} );
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/**
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* Tests error representing non-200 HTTP status code
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*
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* Copyright (C) 2017 R-T Specialty, LLC.
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*
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* This file is part of the Liza Data Collection Framework.
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*
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* liza is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
|
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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const { expect } = require( 'chai' );
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const Sut = require( '../../../' ).dapi.http.HttpError;
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'use strict';
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describe( "HttpError", () =>
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{
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it( "provides HTTP status code", () =>
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{
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const code = 418;
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expect( Sut( 'message', code ).statuscode )
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.to.equal( code );
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} );
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// just make sure overriding ctor calls parent
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it( "sets message", () =>
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{
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const message = 'foobar';
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expect( Sut( message ).message )
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.to.equal( message );
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} );
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} );
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/**
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* Test HTTP using Node.js-compatible API
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*
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* Copyright (C) 2017 R-T Specialty, LLC.
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*
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* This file is part of the Liza Data Collection Framework.
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*
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* liza is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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'use strict';
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const { expect } = require( 'chai' );
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const { Class } = require( 'easejs' );
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const {
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HttpImpl,
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NodeHttpImpl: Sut,
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HttpError,
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} = require( '../../../' ).dapi.http;
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describe( "NodeHttpImpl", () =>
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{
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it( 'is an HttpImpl', function()
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{
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var sut = Sut( function() {} );
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expect( Class.isA( HttpImpl, sut ) ).to.be.ok;
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} );
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[
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{
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label: "uses http for plain HTTP requests",
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protocol: 'http:',
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method: 'GET',
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},
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{
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label: "uses http for plain HTTP requests",
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protocol: 'https:',
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method: 'GET',
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}
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].forEach( ( { label, protocol, method } ) =>
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{
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it( label, done =>
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{
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const url_result = {
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protocol: protocol,
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hostname: 'host',
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port: 8888,
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path: 'foo',
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};
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const url = _createMockUrl( given_url => url_result );
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const data = {};
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const callback_expected = {};
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const callback = () => callback_expected;
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const check = proto => ( opts, given_callback ) =>
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{
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expect( opts.protocol ).to.equal( proto );
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expect( opts.hostname ).to.equal( url_result.hostname );
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expect( opts.port ).to.equal( url_result.port );
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expect( opts.path ).to.equal( url_result.path );
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expect( opts.method ).to.equal( method );
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given_callback( _createMockResp() );
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done();
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};
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const http = _createMockHttp( check( 'http:' ) );
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const https = _createMockHttp( check( 'https:' ) );
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Sut( { http: http, https: https }, url )
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.requestData( '', method, data, callback );
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} );
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} );
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it( "returns response when no error", done =>
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{
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const res = _createMockResp();
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const chunks = [ 'a', 'b', 'c', 'd' ];
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const http = _createMockHttp( ( _, callback ) =>
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{
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callback( res );
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chunks.forEach( chunk => res.trigger( 'data', chunk ) );
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res.trigger( 'end' );
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} );
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Sut( { http: http }, _createMockUrl() )
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.requestData( "", 'GET', '', ( e, data ) =>
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{
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expect( e ).to.equal( null );
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expect( data ).to.equal( chunks.join( '' ) );
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done();
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} );
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} );
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it( "adds data to query string on GET", done =>
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{
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const given_path = '/path';
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const expected_query = 'write data';
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const res = _createMockResp();
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const url = _createMockUrl( given_url => ( {
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protocol: 'http:',
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path: given_path,
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} ) );
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const http = _createMockHttp( ( options, callback ) =>
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{
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expect( options.path )
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.to.equal( given_path + '?' + expected_query );
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callback( res );
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res.trigger( 'end' );
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} );
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Sut( { http: http }, url )
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.requestData( "", 'GET', expected_query, done );
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} );
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it( "writes form data on POST", done =>
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{
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const expected_data = 'expected';
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const expected_write = 'write data';
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const res = _createMockResp();
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const http = _createMockHttp( ( options, callback ) =>
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{
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expect( http.req.written ).to.equal( expected_write );
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expect( options.headers[ 'Content-Type' ] )
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.to.equal( 'application/x-www-form-urlencoded' );
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callback( res );
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// make sure we're still handling the response as well
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res.trigger( 'data', expected_data );
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res.trigger( 'end' );
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} );
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Sut( { http: http }, _createMockUrl() )
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.requestData( "", 'POST', expected_write, ( e, data ) =>
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{
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expect( e ).to.equal( null );
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expect( data ).to.equal( expected_data );
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done();
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} );
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} );
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it( "returns error and response given non-200 status code", done =>
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{
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const res = _createMockResp();
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const http = _createMockHttp( ( _, callback ) =>
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{
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callback( res )
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res.statusCode = 418;
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res.statusMessage = "I'm a teapot";
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res.trigger( 'end' );
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} );
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Sut( { http: http }, _createMockUrl() )
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.requestData( "", 'GET', '', ( e, data ) =>
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{
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expect( e ).to.be.instanceOf( HttpError );
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expect( e.message ).to.equal( res.statusMessage );
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expect( e.statuscode ).to.equal( res.statusCode );
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done();
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} );
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} );
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describe( "given a request error", () =>
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{
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it( "returns error with no response on request error", done =>
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{
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const error = Error( 'test error' );
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const http = _createMockHttp( () => {} );
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Sut( { http: http }, _createMockUrl() )
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.requestData( "", 'GET', '', ( e, data ) =>
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{
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expect( data ).to.equal( null );
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expect( e ).to.equal( error );
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done();
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} );
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// request will be hanging at this point since we didn't call
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// the callback, so we can fail the request
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http.req.trigger( 'error', error );
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} );
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// this should never happen in practice, but we want to defend
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// against it to make sure the callback is not invoked twice
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it( "will not complete request on end", () =>
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{
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let res = _createMockResp();
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|
||||
const http = _createMockHttp( ( _, callback ) =>
|
||||
{
|
||||
// allow hooking `end'
|
||||
callback( res );
|
||||
} );
|
||||
|
||||
Sut( { http: http }, _createMockUrl() )
|
||||
.requestData( "", 'GET', '', ( e, data ) =>
|
||||
{
|
||||
// will fail on successful callback
|
||||
expect( data ).to.equal( null );
|
||||
} );
|
||||
|
||||
http.req.trigger( 'error', Error() );
|
||||
|
||||
// do not invoke a second time (should do nothing)
|
||||
res.trigger( 'end' );
|
||||
} );
|
||||
} );
|
||||
|
||||
|
||||
describe( "protected API", () =>
|
||||
{
|
||||
it( "allows overriding request end behavior", done =>
|
||||
{
|
||||
const expected_data = "expected";
|
||||
const e = Error( "test e" );
|
||||
const value = "resp data";
|
||||
const res = _createMockResp();
|
||||
|
||||
const http = _createMockHttp( ( _, callback ) =>
|
||||
{
|
||||
callback( res );
|
||||
|
||||
res.trigger( 'data', expected_data );
|
||||
res.trigger( 'end' );
|
||||
} );
|
||||
|
||||
Sut.extend(
|
||||
{
|
||||
'override requestEnd'( given_res, data, callback )
|
||||
{
|
||||
expect( given_res ).to.equal( res );
|
||||
expect( data ).to.equal( expected_data );
|
||||
|
||||
callback( e, value );
|
||||
},
|
||||
} )( { http: http }, _createMockUrl() )
|
||||
.requestData( "", 'GET', '', ( given_e, given_data ) =>
|
||||
{
|
||||
expect( given_e ).to.equal( e );
|
||||
expect( given_data ).to.equal( value );
|
||||
|
||||
done();
|
||||
} );
|
||||
} );
|
||||
|
||||
|
||||
it( "allows overriding concept of success", done =>
|
||||
{
|
||||
const res = _createMockResp();
|
||||
|
||||
const http = _createMockHttp( ( _, callback ) =>
|
||||
{
|
||||
callback( res );
|
||||
res.trigger( 'end' );
|
||||
} );
|
||||
|
||||
// would normally be a failure
|
||||
res.statusCode = 500;
|
||||
|
||||
Sut.extend(
|
||||
{
|
||||
'override isSuccessful': ( given_res ) => true,
|
||||
} )( { http: http }, _createMockUrl() )
|
||||
.requestData( "", 'GET', '', ( e ) =>
|
||||
{
|
||||
expect( e ).to.equal( null );
|
||||
done();
|
||||
} );
|
||||
} );
|
||||
|
||||
|
||||
it( "allows overriding error handling", done =>
|
||||
{
|
||||
const expected_e = Error( 'expected' );
|
||||
const error = {};
|
||||
const value = 'error data';
|
||||
|
||||
const http = _createMockHttp( ( _, callback ) =>
|
||||
{
|
||||
callback( _createMockResp() );
|
||||
} );
|
||||
|
||||
Sut.extend(
|
||||
{
|
||||
'override serveError'(
|
||||
given_e, given_res, given_data, callback
|
||||
)
|
||||
{
|
||||
expect( given_e ).to.equal( expected_e );
|
||||
expect( given_res ).to.equal( null );
|
||||
expect( given_data ).to.equal( null );
|
||||
|
||||
error.e = given_e;
|
||||
callback( error, value );
|
||||
},
|
||||
} )( { http: http }, _createMockUrl() )
|
||||
.requestData( "", 'GET', '', ( e, given_value ) =>
|
||||
{
|
||||
expect( e ).to.equal( error );
|
||||
expect( e.e ).to.equal( expected_e );
|
||||
expect( given_value ).to.equal( value );
|
||||
|
||||
done();
|
||||
} );
|
||||
|
||||
// we're still hanging the request since we haven't called the
|
||||
// callback in http
|
||||
http.req.trigger( 'error', expected_e );
|
||||
} );
|
||||
} );
|
||||
} );
|
||||
|
||||
|
||||
const _createMockHttp = req_callback =>
|
||||
{
|
||||
const events = {};
|
||||
|
||||
return Object.create( {
|
||||
req: Object.create( {
|
||||
written: '',
|
||||
|
||||
on( event, hook )
|
||||
{
|
||||
events[ event ] = hook;
|
||||
},
|
||||
|
||||
trigger( event, data )
|
||||
{
|
||||
events[ event ]( data );
|
||||
},
|
||||
|
||||
end()
|
||||
{
|
||||
// thunk defined by #request below
|
||||
events.onend();
|
||||
},
|
||||
|
||||
write( data )
|
||||
{
|
||||
this.written = data;
|
||||
},
|
||||
} ),
|
||||
|
||||
request( options, callback )
|
||||
{
|
||||
// not a real event; just for convenience
|
||||
events.onend = () => req_callback( options, callback );
|
||||
|
||||
return this.req;
|
||||
},
|
||||
} );
|
||||
};
|
||||
|
||||
|
||||
const _createMockUrl = callback => ( {
|
||||
parse: callback || ( () => ( { protocol: 'http:' } ) ),
|
||||
} );
|
||||
|
||||
const _createMockResp = () => Object.create( {
|
||||
event: {
|
||||
data() {},
|
||||
end() {},
|
||||
},
|
||||
|
||||
statusCode: 200,
|
||||
|
||||
on( ev, hook )
|
||||
{
|
||||
this.event[ ev ] = hook;
|
||||
},
|
||||
|
||||
trigger( ev, data )
|
||||
{
|
||||
this.event[ ev ]( data );
|
||||
}
|
||||
} );
|
||||
Loading…
Reference in New Issue