lib/compiler-finder.js - compiler-explorer - Rivoreo Source Code Repositories

 // Copyright (c) 2018, Compiler Explorer Authors
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are met:
 //
 //     * Redistributions of source code must retain the above copyright notice,
 //       this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above copyright
 //       notice, this list of conditions and the following disclaimer in the
 //       documentation and/or other materials provided with the distribution.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 // POSSIBILITY OF SUCH DAMAGE.

 const logger = require('./logger').logger,
     _ = require('underscore'),
     fs = require('fs-extra'),
     path = require('path'),
     urljoin = require('url-join'),
     http = require('http'),
     https = require('https'),
     aws = require('./aws');

 /***
  * Finds and initializes the compilers stored on the properties files
  */
 class CompilerFinder {
     /***
      * @param {CompileHandler} compileHandler
      * @param {CompilerProps} compilerProps
      * @param {propsFor} awsProps
      * @param {Object} args
      */
     constructor(compileHandler, compilerProps, awsProps, args, optionsHandler) {
         this.compilerProps = compilerProps.get.bind(compilerProps);
         this.ceProps = compilerProps.ceProps;
         this.awsProps = awsProps;
         this.args = args;
         this.compileHandler = compileHandler;
         this.languages = compilerProps.languages;
         this.awsPoller = null;
         this.optionsHandler = optionsHandler;
     }

     awsInstances() {
         if (!this.awsPoller) this.awsPoller = new aws.InstanceFetcher(this.awsProps);
         return this.awsPoller.getInstances();
     }

     fetchRemote(host, port, uriBase, props, langId) {
         const requestLib = port === 443 ? https : http;
         const uriSchema = port === 443 ? "https" : "http";
         const uri = urljoin(`${uriSchema}://${host}:${port}`, uriBase);
         let apiPath = urljoin('/', uriBase || '', 'api/compilers', langId || '');
         logger.info(`Fetching compilers from remote source ${uri}`);
         return this.retryPromise(
             () => {
                 return new Promise((resolve, reject) => {
                     const request = requestLib.get({
                         hostname: host,
                         port: port,
                         path: apiPath,
                         headers: {
                             Accept: 'application/json'
                         }
                     }, res => {
                         let error;
                         const {statusCode} = res;
                         const contentType = res.headers['content-type'];

                         if (statusCode !== 200) {
                             error = new Error('Failed fetching remote compilers from ' +
                                 `${uriSchema}://${host}:${port}${apiPath}\n` +
                                 `Status Code: ${statusCode}`);
                         } else if (!/^application\/json/.test(contentType)) {
                             error = new Error('Invalid content-type.\n' +
                                 `Expected application/json but received ${contentType}`);
                         }
                         if (error) {
                             logger.error(error.message);
                             // consume response data to free up memory
                             res.resume();
                             reject(error);
                             return;
                         }
                         let str = '';
                         res.on('data', chunk => {
                             str += chunk;
                         });
                         res.on('end', () => {
                             try {
                                 const compilers = JSON.parse(str).map(compiler => {
                                     // Fix up old upstream implementations of Compiler Explorer
                                     // e.g. https://www.godbolt.ms
                                     // (see https://github.com/mattgodbolt/compiler-explorer/issues/1768)
                                     if (!compiler.alias) compiler.alias = [];
                                     if (typeof compiler.alias == "string") compiler.alias = [compiler.alias];
                                     // End fixup
                                     compiler.exe = null;
                                     compiler.remote = {
                                         target: `${uriSchema}://${host}:${port}`,
                                         path: urljoin('/', uriBase, 'api/compiler', compiler.id, 'compile')
                                     };
                                     return compiler;
                                 });
                                 resolve(compilers);
                             } catch (e) {
                                 logger.error(`Error parsing response from ${uri} '${str}': ${e.message}`);
                                 reject(e);
                             }
                         });
                     })
                         .on('error', reject)
                         .on('timeout', () => reject("timeout"));
                     request.setTimeout(this.awsProps('proxyTimeout', 1000));
                 });
             },
             `${host}:${port}`,
             props('proxyRetries', 5),
             props('proxyRetryMs', 500)
         ).catch(() => {
             logger.warn(`Unable to contact ${host}:${port}; skipping`);
             return [];
         });
     }

     fetchAws() {
         logger.info("Fetching instances from AWS");
         return this.awsInstances().then(instances => {
             return Promise.all(instances.map(instance => {
                 logger.info("Checking instance " + instance.InstanceId);
                 let address = instance.PrivateDnsName;
                 if (this.awsProps("externalTestMode", false)) {
                     address = instance.PublicDnsName;
                 }
                 return this.fetchRemote(address, this.args.port, '', this.awsProps, null);
             }));
         });
     }

     compilerConfigFor(langId, compilerName, parentProps) {
         const base = `compiler.${compilerName}.`;

         function props(propName, def) {
             let propsForCompiler = parentProps(langId, base + propName, undefined);
             if (propsForCompiler === undefined) {
                 propsForCompiler = parentProps(langId, propName, def);
             }
             return propsForCompiler;
         }

         const ceToolsPath = props("ceToolsPath", "./");
         const supportsBinary = !!props("supportsBinary", true);
         const supportsExecute = supportsBinary && !!props("supportsExecute", true);
         const supportsLibraryCodeFilter = !!props("supportsLibraryCodeFilter", true);
         const group = props("group", "");
         const demanglerProp = props("demangler", undefined);
         const demangler = demanglerProp === undefined ?
             "" : path.normalize(demanglerProp.replace("${ceToolsPath}", ceToolsPath));
         const isSemVer = props("isSemVer", false);
         const baseName = props("baseName", null);
         const semverVer = props("semver", "");
         const name = props("name", compilerName);
         const envVars = (() => {
             let envVarsString = props("envVars", "");
             if (envVarsString === "") {
                 return [];
             } else {
                 let arr = [];
                 for (const el of envVarsString.split(':')) {
                     const [env, setting] = el.split('=');
                     arr.push([env, setting]);
                 }
                 return arr;
             }
         })();
         const exe = props("exe", compilerName);
         const exePath = path.dirname(exe);
         const compilerInfo = {
             id: compilerName,
             exe: exe,
             name: isSemVer && baseName ? `${baseName} ${semverVer}` : name,
             alias: _.filter(props("alias", "").split(":"), (a) => a !== ""),
             options: props("options"),
             versionFlag: props("versionFlag"),
             versionRe: props("versionRe"),
             compilerType: props("compilerType", ""),
             demangler: demangler,
             demanglerClassFile: props("demanglerClassFile", ""),
             objdumper: props("objdumper", ""),
             intelAsm: props("intelAsm", ""),
             needsMulti: !!props("needsMulti", true),
             supportsDemangle: !!demangler,
             supportsBinary: supportsBinary,
             supportsExecute: supportsExecute,
             supportsLibraryCodeFilter: supportsLibraryCodeFilter,
             postProcess: props("postProcess", "").split("|"),
             lang: langId,
             group: group,
             groupName: props("groupName", ""),
             includeFlag: props("includeFlag", "-isystem"),
             includePath: props("includePath", ""),
             linkFlag: props("linkFlag", "-l"),
             rpathFlag: props("rpathFlag", "-Wl,-rpath,"),
             libpathFlag: props("libpathFlag", "-L"),
             libPath: props("libPath", ""),
             ldPath: props("ldPath", "")
                 .split("|")
                 .map(x => path.normalize(x.replace("${exePath}", exePath))),
             envVars: envVars,
             notification: props("notification", ""),
             isSemVer: isSemVer,
             semver: semverVer,
             libs: this.optionsHandler.get().libs[langId],
             tools: _.omit(this.optionsHandler.get().tools[langId], tool => tool.isCompilerExcluded(compilerName)),
             unwiseOptions: props("unwiseOptions", "").split("|")
         };
         logger.debug("Found compiler", compilerInfo);
         return Promise.resolve(compilerInfo);
     }

     recurseGetCompilers(langId, compilerName, parentProps) {
         // Don't treat @ in paths as remote addresses if requested
         if (this.args.fetchCompilersFromRemote && compilerName.indexOf("@") !== -1) {
             const bits = compilerName.split("@");
             const host = bits[0];
             const pathParts = bits[1].split('/');
             const port = parseInt(pathParts.shift());
             const path = pathParts.join('/');
             return this.fetchRemote(host, port, path, this.ceProps, langId);
         }
         if (compilerName.indexOf("&") === 0) {
             const groupName = compilerName.substr(1);

             const props = (langId, name, def) => {
                 if (name === "group") {
                     return groupName;
                 }
                 return this.compilerProps(langId, `group.${groupName}.${name}`, parentProps(langId, name, def));
             };
             const exes = _.compact(this.compilerProps(langId, `group.${groupName}.compilers`, '').split(":"));
             logger.debug(`Processing compilers from group ${groupName}`);
             return Promise.all(exes.map(compiler => this.recurseGetCompilers(langId, compiler, props)));
         }
         if (compilerName === "AWS") return this.fetchAws();
         return this.compilerConfigFor(langId, compilerName, parentProps);
     }

     getCompilers() {
         this.getExes();
         let compilers = [];
         _.each(this.exes, (exs, langId) => {
             _.each(exs, exe => compilers.push(this.recurseGetCompilers(langId, exe, this.compilerProps)));
         });
         return compilers;
     }

     ensureDistinct(compilers) {
         let ids = {};
         let foundClash = false;
         _.each(compilers, compiler => {
             if (!ids[compiler.id]) ids[compiler.id] = [];
             ids[compiler.id].push(compiler);
         });
         _.each(ids, (list, id) => {
             if (list.length !== 1) {
                 foundClash = true;
                 logger.error(`Compiler ID clash for '${id}' - used by ${
                     _.map(list, o => `lang:${o.lang} name:${o.name}`).join(', ')}`);
             }
         });
         return {compilers, foundClash};
     }

     retryPromise(promiseFunc, name, maxFails, retryMs) {
         return new Promise(function (resolve, reject) {
             let fails = 0;

             function doit() {
                 const promise = promiseFunc();
                 promise.then(function (arg) {
                     resolve(arg);
                 }, function (e) {
                     fails++;
                     if (fails < maxFails) {
                         logger.warn(`Failed ${name} : ${e}, retrying`);
                         setTimeout(doit, retryMs);
                     } else {
                         logger.error(`Too many retries for ${name} : ${e}`);
                         reject(e);
                     }
                 });
             }

             doit();
         });
     }

     getExes() {
         this.exes = this.compilerProps(this.languages, "compilers", "", exs => _.compact(exs.split(":")));
         logger.info('Exes found:', this.exes);
         this.getNdkExes();
     }

     getNdkExes() {
         const ndkPaths = this.compilerProps(this.languages, 'androidNdk');
         _.each(ndkPaths, (ndkPath, langId) => {
             if (ndkPath) {
                 let toolchains = fs.readdirSync(`${ndkPath}/toolchains`);
                 toolchains.forEach((version, index, a) => {
                     const path = `${ndkPath}/toolchains/${version}/prebuilt/linux-x86_64/bin/`;
                     if (fs.existsSync(path)) {
                         const cc = fs.readdirSync(path).filter(filename => filename.indexOf("g++") !== -1);
                         a[index] = path + cc[0];
                     } else {
                         a[index] = null;
                     }
                 });
                 toolchains = toolchains.filter(x => x !== null);
                 this.exes[langId].push(toolchains);
             }
         });
     }

     find() {
         return Promise.all(this.getCompilers())
             .then(_.flatten)
             .then(compilers => this.compileHandler.setCompilers(compilers))
             .then(compilers => _.compact(compilers))
             .then(this.ensureDistinct)
             .then(result => {
                 return {foundClash: result.foundClash, compilers: _.sortBy(result.compilers, "name")};
             });
     }
 }

 module.exports = CompilerFinder;
	// Copyright (c) 2018, Compiler Explorer Authors
	// All rights reserved.
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are met:
	//
	// * Redistributions of source code must retain the above copyright notice,
	// this list of conditions and the following disclaimer.
	// * Redistributions in binary form must reproduce the above copyright
	// notice, this list of conditions and the following disclaimer in the
	// documentation and/or other materials provided with the distribution.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
	// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
	// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
	// POSSIBILITY OF SUCH DAMAGE.

	const logger = require('./logger').logger,
	_ = require('underscore'),
	fs = require('fs-extra'),
	path = require('path'),
	urljoin = require('url-join'),
	http = require('http'),
	https = require('https'),
	aws = require('./aws');

	/***
	* Finds and initializes the compilers stored on the properties files
	*/
	class CompilerFinder {
	/***
	* @param {CompileHandler} compileHandler
	* @param {CompilerProps} compilerProps
	* @param {propsFor} awsProps
	* @param {Object} args
	*/
	constructor(compileHandler, compilerProps, awsProps, args, optionsHandler) {
	this.compilerProps = compilerProps.get.bind(compilerProps);
	this.ceProps = compilerProps.ceProps;
	this.awsProps = awsProps;
	this.args = args;
	this.compileHandler = compileHandler;
	this.languages = compilerProps.languages;
	this.awsPoller = null;
	this.optionsHandler = optionsHandler;
	}

	awsInstances() {
	if (!this.awsPoller) this.awsPoller = new aws.InstanceFetcher(this.awsProps);
	return this.awsPoller.getInstances();
	}

	fetchRemote(host, port, uriBase, props, langId) {
	const requestLib = port === 443 ? https : http;
	const uriSchema = port === 443 ? "https" : "http";
	const uri = urljoin(`${uriSchema}://${host}:${port}`, uriBase);
	let apiPath = urljoin('/', uriBase \|\| '', 'api/compilers', langId \|\| '');
	logger.info(`Fetching compilers from remote source ${uri}`);
	return this.retryPromise(
	() => {
	return new Promise((resolve, reject) => {
	const request = requestLib.get({
	hostname: host,
	port: port,
	path: apiPath,
	headers: {
	Accept: 'application/json'
	}
	}, res => {
	let error;
	const {statusCode} = res;
	const contentType = res.headers['content-type'];

	if (statusCode !== 200) {
	error = new Error('Failed fetching remote compilers from ' +
	`${uriSchema}://${host}:${port}${apiPath}\n` +
	`Status Code: ${statusCode}`);
	} else if (!/^application\/json/.test(contentType)) {
	error = new Error('Invalid content-type.\n' +
	`Expected application/json but received ${contentType}`);
	}
	if (error) {
	logger.error(error.message);
	// consume response data to free up memory
	res.resume();
	reject(error);
	return;
	}
	let str = '';
	res.on('data', chunk => {
	str += chunk;
	});
	res.on('end', () => {
	try {
	const compilers = JSON.parse(str).map(compiler => {
	// Fix up old upstream implementations of Compiler Explorer
	// e.g. https://www.godbolt.ms
	// (see https://github.com/mattgodbolt/compiler-explorer/issues/1768)
	if (!compiler.alias) compiler.alias = [];
	if (typeof compiler.alias == "string") compiler.alias = [compiler.alias];
	// End fixup
	compiler.exe = null;
	compiler.remote = {
	target: `${uriSchema}://${host}:${port}`,
	path: urljoin('/', uriBase, 'api/compiler', compiler.id, 'compile')
	};
	return compiler;
	});
	resolve(compilers);
	} catch (e) {
	logger.error(`Error parsing response from ${uri} '${str}': ${e.message}`);
	reject(e);
	}
	});
	})
	.on('error', reject)
	.on('timeout', () => reject("timeout"));
	request.setTimeout(this.awsProps('proxyTimeout', 1000));
	});
	},
	`${host}:${port}`,
	props('proxyRetries', 5),
	props('proxyRetryMs', 500)
	).catch(() => {
	logger.warn(`Unable to contact ${host}:${port}; skipping`);
	return [];
	});
	}

	fetchAws() {
	logger.info("Fetching instances from AWS");
	return this.awsInstances().then(instances => {
	return Promise.all(instances.map(instance => {
	logger.info("Checking instance " + instance.InstanceId);
	let address = instance.PrivateDnsName;
	if (this.awsProps("externalTestMode", false)) {
	address = instance.PublicDnsName;
	}
	return this.fetchRemote(address, this.args.port, '', this.awsProps, null);
	}));
	});
	}

	compilerConfigFor(langId, compilerName, parentProps) {
	const base = `compiler.${compilerName}.`;

	function props(propName, def) {
	let propsForCompiler = parentProps(langId, base + propName, undefined);
	if (propsForCompiler === undefined) {
	propsForCompiler = parentProps(langId, propName, def);
	}
	return propsForCompiler;
	}

	const ceToolsPath = props("ceToolsPath", "./");
	const supportsBinary = !!props("supportsBinary", true);
	const supportsExecute = supportsBinary && !!props("supportsExecute", true);
	const supportsLibraryCodeFilter = !!props("supportsLibraryCodeFilter", true);
	const group = props("group", "");
	const demanglerProp = props("demangler", undefined);
	const demangler = demanglerProp === undefined ?
	"" : path.normalize(demanglerProp.replace("${ceToolsPath}", ceToolsPath));
	const isSemVer = props("isSemVer", false);
	const baseName = props("baseName", null);
	const semverVer = props("semver", "");
	const name = props("name", compilerName);
	const envVars = (() => {
	let envVarsString = props("envVars", "");
	if (envVarsString === "") {
	return [];
	} else {
	let arr = [];
	for (const el of envVarsString.split(':')) {
	const [env, setting] = el.split('=');
	arr.push([env, setting]);
	}
	return arr;
	}
	})();
	const exe = props("exe", compilerName);
	const exePath = path.dirname(exe);
	const compilerInfo = {
	id: compilerName,
	exe: exe,
	name: isSemVer && baseName ? `${baseName} ${semverVer}` : name,
	alias: _.filter(props("alias", "").split(":"), (a) => a !== ""),
	options: props("options"),
	versionFlag: props("versionFlag"),
	versionRe: props("versionRe"),
	compilerType: props("compilerType", ""),
	demangler: demangler,
	demanglerClassFile: props("demanglerClassFile", ""),
	objdumper: props("objdumper", ""),
	intelAsm: props("intelAsm", ""),
	needsMulti: !!props("needsMulti", true),
	supportsDemangle: !!demangler,
	supportsBinary: supportsBinary,
	supportsExecute: supportsExecute,
	supportsLibraryCodeFilter: supportsLibraryCodeFilter,
	postProcess: props("postProcess", "").split("\|"),
	lang: langId,
	group: group,
	groupName: props("groupName", ""),
	includeFlag: props("includeFlag", "-isystem"),
	includePath: props("includePath", ""),
	linkFlag: props("linkFlag", "-l"),
	rpathFlag: props("rpathFlag", "-Wl,-rpath,"),
	libpathFlag: props("libpathFlag", "-L"),
	libPath: props("libPath", ""),
	ldPath: props("ldPath", "")
	.split("\|")
	.map(x => path.normalize(x.replace("${exePath}", exePath))),
	envVars: envVars,
	notification: props("notification", ""),
	isSemVer: isSemVer,
	semver: semverVer,
	libs: this.optionsHandler.get().libs[langId],
	tools: _.omit(this.optionsHandler.get().tools[langId], tool => tool.isCompilerExcluded(compilerName)),
	unwiseOptions: props("unwiseOptions", "").split("\|")
	};
	logger.debug("Found compiler", compilerInfo);
	return Promise.resolve(compilerInfo);
	}

	recurseGetCompilers(langId, compilerName, parentProps) {
	// Don't treat @ in paths as remote addresses if requested
	if (this.args.fetchCompilersFromRemote && compilerName.indexOf("@") !== -1) {
	const bits = compilerName.split("@");
	const host = bits[0];
	const pathParts = bits[1].split('/');
	const port = parseInt(pathParts.shift());
	const path = pathParts.join('/');
	return this.fetchRemote(host, port, path, this.ceProps, langId);
	}
	if (compilerName.indexOf("&") === 0) {
	const groupName = compilerName.substr(1);

	const props = (langId, name, def) => {
	if (name === "group") {
	return groupName;
	}
	return this.compilerProps(langId, `group.${groupName}.${name}`, parentProps(langId, name, def));
	};
	const exes = _.compact(this.compilerProps(langId, `group.${groupName}.compilers`, '').split(":"));
	logger.debug(`Processing compilers from group ${groupName}`);
	return Promise.all(exes.map(compiler => this.recurseGetCompilers(langId, compiler, props)));
	}
	if (compilerName === "AWS") return this.fetchAws();
	return this.compilerConfigFor(langId, compilerName, parentProps);
	}

	getCompilers() {
	this.getExes();
	let compilers = [];
	_.each(this.exes, (exs, langId) => {
	_.each(exs, exe => compilers.push(this.recurseGetCompilers(langId, exe, this.compilerProps)));
	});
	return compilers;
	}

	ensureDistinct(compilers) {
	let ids = {};
	let foundClash = false;
	_.each(compilers, compiler => {
	if (!ids[compiler.id]) ids[compiler.id] = [];
	ids[compiler.id].push(compiler);
	});
	_.each(ids, (list, id) => {
	if (list.length !== 1) {
	foundClash = true;
	logger.error(`Compiler ID clash for '${id}' - used by ${
	_.map(list, o => `lang:${o.lang} name:${o.name}`).join(', ')}`);
	}
	});
	return {compilers, foundClash};
	}

	retryPromise(promiseFunc, name, maxFails, retryMs) {
	return new Promise(function (resolve, reject) {
	let fails = 0;

	function doit() {
	const promise = promiseFunc();
	promise.then(function (arg) {
	resolve(arg);
	}, function (e) {
	fails++;
	if (fails < maxFails) {
	logger.warn(`Failed ${name} : ${e}, retrying`);
	setTimeout(doit, retryMs);
	} else {
	logger.error(`Too many retries for ${name} : ${e}`);
	reject(e);
	}
	});
	}

	doit();
	});
	}

	getExes() {
	this.exes = this.compilerProps(this.languages, "compilers", "", exs => _.compact(exs.split(":")));
	logger.info('Exes found:', this.exes);
	this.getNdkExes();
	}

	getNdkExes() {
	const ndkPaths = this.compilerProps(this.languages, 'androidNdk');
	_.each(ndkPaths, (ndkPath, langId) => {
	if (ndkPath) {
	let toolchains = fs.readdirSync(`${ndkPath}/toolchains`);
	toolchains.forEach((version, index, a) => {
	const path = `${ndkPath}/toolchains/${version}/prebuilt/linux-x86_64/bin/`;
	if (fs.existsSync(path)) {
	const cc = fs.readdirSync(path).filter(filename => filename.indexOf("g++") !== -1);
	a[index] = path + cc[0];
	} else {
	a[index] = null;
	}
	});
	toolchains = toolchains.filter(x => x !== null);
	this.exes[langId].push(toolchains);
	}
	});
	}

	find() {
	return Promise.all(this.getCompilers())
	.then(_.flatten)
	.then(compilers => this.compileHandler.setCompilers(compilers))
	.then(compilers => _.compact(compilers))
	.then(this.ensureDistinct)
	.then(result => {
	return {foundClash: result.foundClash, compilers: _.sortBy(result.compilers, "name")};
	});
	}
	}

	module.exports = CompilerFinder;