cloudlens.cli.Main.java Source code

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Here is the source code for cloudlens.cli.Main.java

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/*
 *  This file is part of the CloudLens project.
 *
 * Copyright omitted for blind review
 *
 * 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.
 */

package cloudlens.cli;

import java.io.InputStream;
import java.util.List;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.DefaultParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.Option;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;

import cloudlens.engine.CL;
import cloudlens.engine.CLException;
import cloudlens.parser.ASTBuilder;
import cloudlens.parser.ASTElement;
import cloudlens.parser.ASTException;
import cloudlens.parser.FileReader;

public class Main {

    public static void main(String[] args) throws Exception {
        final CommandLineParser optionParser = new DefaultParser();
        final HelpFormatter formatter = new HelpFormatter();

        final Option lens = Option.builder("r").longOpt("run").hasArg().argName("lens file").desc("Lens file.")
                .required(true).build();
        final Option log = Option.builder("l").longOpt("log").hasArg().argName("log file").desc("Log file.")
                .build();
        final Option jsonpath = Option.builder().longOpt("jsonpath").hasArg().argName("path")
                .desc("Path to logs in a json object.").build();
        final Option js = Option.builder().longOpt("js").hasArg().argName("js file").desc("Load JS file.").build();
        final Option format = Option.builder("f").longOpt("format").hasArg()
                .desc("Choose log format (text or json).").build();
        final Option streaming = Option.builder().longOpt("stream").desc("Streaming mode.").build();
        final Option history = Option.builder().longOpt("history").desc("Store history.").build();

        final Options options = new Options();
        options.addOption(log);
        options.addOption(lens);
        options.addOption(format);
        options.addOption(jsonpath);
        options.addOption(js);
        options.addOption(streaming);
        options.addOption(history);

        try {
            final CommandLine cmd = optionParser.parse(options, args);

            final String jsonPath = cmd.getOptionValue("jsonpath");
            final String[] jsFiles = cmd.getOptionValues("js");
            final String[] lensFiles = cmd.getOptionValues("run");
            final String[] logFiles = cmd.getOptionValues("log");
            final String source = cmd.getOptionValue("format");

            final boolean stream = cmd.hasOption("stream") || !cmd.hasOption("log");
            final boolean withHistory = cmd.hasOption("history") || !stream;

            final CL cl = new CL(System.out, System.err, stream, withHistory);

            try {
                final InputStream input = (cmd.hasOption("log")) ? FileReader.readFiles(logFiles) : System.in;

                if (source == null) {
                    cl.source(input);
                } else {
                    switch (source) {
                    case "text":
                        cl.source(input);
                        break;
                    case "json":
                        cl.json(input, jsonPath);
                        break;
                    default:
                        input.close();
                        throw new CLException("Unsupported format: " + source);
                    }
                }

                for (final String jsFile : FileReader.fullPaths(jsFiles)) {
                    cl.engine.eval("CL.loadjs('file://" + jsFile + "')");
                }

                final List<ASTElement> top = ASTBuilder.parseFiles(lensFiles);
                cl.launch(top);

            } catch (final CLException | ASTException e) {
                cl.errWriter.println(e.getMessage());
            } finally {
                cl.outWriter.flush();
                cl.errWriter.flush();
            }
        } catch (final ParseException e) {
            System.err.println(e.getMessage());
            formatter.printHelp("cloudlens", options);
        }
    }
}