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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// TODO: refactor. Remove disposable server. Create a server in the electron process and have it serve assets from local directories. Should be similar to SimpleServer.
// MODULES //
var spawn = require( 'child_process' ).spawn;
var path = require( 'path' );
var logger = require( 'debug' );
var toHTML = require( 'vdom-to-html' );
var instanceOf = require( '@stdlib/assert/instance-of' );
var ENV = require( '@stdlib/process/env' );
var copy = require( '@stdlib/utils/copy' );
var merge = require( '@stdlib/utils/merge' );
var readFileSync = require( '@stdlib/fs/read-file' ).sync;
var httpServer = require( '@stdlib/net/disposable-http-server' );
var tryRequire = require( '@stdlib/utils/try-require' );
// VARIABLES //
var debug = logger( 'plot:view:electron:main' );
var electron = tryRequire( '@stdlib/electron' );
// MAIN //
/**
* Opens a plot in an electron window.
*
* @private
* @param {Plot} plot - plot context
* @param {VTree} vtree - virtual tree
* @throws {Error} Electron must be properly installed
*/
function view( plot, vtree ) {
var index;
var html;
var opts;
var css;
if ( instanceOf( electron, Error ) ) {
throw new Error( 'invalid operation. Unable to load Electron. Ensure Electron is installed and try again.' );
}
debug( 'Transforming virtual DOM tree to HTML...' );
html = toHTML( vtree );
// Define `fs` options:
opts = {
'encoding': 'utf8'
};
debug( 'Injecting HTML into HTML template...' );
index = path.join( __dirname, 'index.html' );
index = readFileSync( index, opts );
index = index.replace( /\{\{plot\}\}/, html );
debug( 'Injecting CSS into HTML template...' );
css = path.join( __dirname, 'css', 'reset.css' );
css = readFileSync( css, opts );
index = index.replace( /\{\{reset\}\}/, css );
css = path.join( __dirname, 'css', 'colors.css' );
css = readFileSync( css, opts );
index = index.replace( /\{\{colors\}\}/, css );
css = path.join( __dirname, 'css', 'styles.css' );
css = readFileSync( css, opts );
index = index.replace( /\{\{styles\}\}/, css );
debug( 'Creating a disposable HTTP server...' );
opts = {
'html': index,
'open': false
};
httpServer( opts, onReady );
/**
* Callback invoked once a server is ready to receive requests.
*
* @private
* @param {(Error|null)} error - error object
* @param {Server} server - HTTP server
* @throws {Error} unexpected error
*/
function onReady( error, server ) {
var child;
var addr;
var opts;
var env;
if ( error ) {
throw error;
}
addr = server.address();
debug( 'HTTP server initialized. Server is listening for requests on %s:%d.', addr.address, addr.port );
debug( 'Electron executable: %s.', electron );
// TODO: extract fixed env vars to config file and then won't need to pass via environment variables, but can simply require
env = {
'SERVER_PORT': addr.port,
'SERVER_ADDRESS': addr.address,
'PLOT_WIDTH': plot.width,
'PLOT_HEIGHT': plot.height,
'PLOT_APP_PATH': __dirname,
'PLOT_MIN_WIDTH': 100,
'PLOT_MIN_HEIGHT': 100,
'PLOT_TITLE': plot.title || 'stdlib'
};
debug( 'Electron process environment variables: %s.', JSON.stringify( env ) );
opts = {
'cwd': __dirname,
'detached': true,
'stdio': 'ignore'
};
debug( 'Electron process options: %s.', JSON.stringify( opts ) );
// Merge the current process' environment variables:
opts.env = merge( {}, copy( ENV ), env );
debug( 'Spawning an electron process...' );
child = spawn( electron, [ './main.js' ], opts );
child.unref();
}
}
// EXPORTS //
module.exports = view;
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