001/*
002 * (C) Copyright 2017 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 *
016 * Contributors:
017 *     bdelbosc
018 */
019package org.nuxeo.lib.stream.tools.command;
020
021import java.time.Duration;
022
023import org.apache.commons.cli.CommandLine;
024import org.apache.commons.cli.Option;
025import org.apache.commons.cli.Options;
026import org.nuxeo.lib.stream.computation.Record;
027import org.nuxeo.lib.stream.log.LogManager;
028import org.nuxeo.lib.stream.log.LogRecord;
029import org.nuxeo.lib.stream.log.LogTailer;
030import org.nuxeo.lib.stream.tools.renderer.Renderer;
031
032/**
033 * Output records to stdout.
034 *
035 * @since 9.3
036 */
037public class CatCommand extends Command {
038
039    protected static final String NAME = "cat";
040
041    @Override
042    public String name() {
043        return NAME;
044    }
045
046    @Override
047    public void updateOptions(Options options) {
048        options.addOption(
049                Option.builder("n").longOpt("lines").desc("Render the first N records").hasArg().argName("N").build());
050        options.addOption(Option.builder("l")
051                                .longOpt("log-name")
052                                .desc("Log name")
053                                .required()
054                                .hasArg()
055                                .argName("LOG_NAME")
056                                .build());
057        options.addOption(
058                Option.builder("g").longOpt("group").desc("Consumer group").hasArg().argName("GROUP").build());
059        options.addOption(Option.builder()
060                                .longOpt("codec")
061                                .desc("Codec used to read record, can be: java, avro, avroBinary, avroJson")
062                                .hasArg()
063                                .argName("CODEC")
064                                .build());
065        options.addOption(
066                Option.builder().longOpt("render").desc("Output rendering").hasArg().argName("FORMAT").build());
067
068    }
069
070    @Override
071    public boolean run(LogManager manager, CommandLine cmd) throws InterruptedException {
072        int limit = Integer.parseInt(cmd.getOptionValue("lines", "-1"));
073        String name = cmd.getOptionValue("log-name");
074        String render = cmd.getOptionValue("render", "default");
075        String group = cmd.getOptionValue("group", "tools");
076        String codec = cmd.getOptionValue("codec");
077        cat(manager, name, group, limit, getRecordRenderer(render), codec);
078        return true;
079    }
080
081    protected void cat(LogManager manager, String name, String group, int limit, Renderer render, String codec)
082            throws InterruptedException {
083        render.header();
084        try (LogTailer<Record> tailer = manager.createTailer(group, name, getRecordCodec(codec))) {
085            int count = 0;
086            do {
087                LogRecord<Record> record = tailer.read(Duration.ofMillis(1000));
088                if (record == null) {
089                    break;
090                }
091                count++;
092                render.accept(record);
093            } while (limit < 0 || (count < limit));
094        }
095        render.footer();
096    }
097}