com.twitter.bazel.checkstyle.PythonCheckstyle.java Source code

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Here is the source code for com.twitter.bazel.checkstyle.PythonCheckstyle.java

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// Copyright 2016 Twitter. All rights reserved.
//
// 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 com.twitter.bazel.checkstyle;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.logging.Logger;

import com.google.common.base.Predicates;
import com.google.common.collect.Collections2;
import com.google.devtools.build.lib.actions.extra.ExtraActionInfo;
import com.google.devtools.build.lib.actions.extra.SpawnInfo;

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;

/**
 * Verifies that the python source styles conform to the python styles in pylint.
 * Usage: java com.twitter.bazel.checkstyle.PythonCheckstyle -f <extra_action_file> -p <pylint_file>
 * <p>
 * To test:
 * $ bazel build --config=darwin --experimental_action_listener=tools/python:compile_python heron/cli/src/python/...
 */
public final class PythonCheckstyle {
    public static final Logger LOG = Logger.getLogger(PythonCheckstyle.class.getName());
    private static final String CLASSNAME = PythonCheckstyle.class.getCanonicalName();

    private PythonCheckstyle() {
    }

    public static void main(String[] args) throws IOException {
        CommandLineParser parser = new DefaultParser();

        // create the Options
        Options options = new Options();
        options.addOption(Option.builder("f").required(true).hasArg().longOpt("extra_action_file")
                .desc("bazel extra action protobuf file").build());
        options.addOption(Option.builder("p").required(true).hasArg().longOpt("pylint_file")
                .desc("Executable pylint file to invoke").build());

        try {
            // parse the command line arguments
            CommandLine line = parser.parse(options, args);

            String extraActionFile = line.getOptionValue("f");
            String pylintFile = line.getOptionValue("p");

            Collection<String> sourceFiles = getSourceFiles(extraActionFile);
            if (sourceFiles.size() == 0) {
                LOG.info("No python files found by checkstyle");
                return;
            }

            LOG.info(sourceFiles.size() + " python files found by checkstyle");

            // Create and run the command
            List<String> commandBuilder = new ArrayList<>();
            commandBuilder.add(pylintFile);
            commandBuilder.addAll(sourceFiles);
            runLinter(commandBuilder);

        } catch (ParseException exp) {
            LOG.severe(String.format("Invalid input to %s: %s", CLASSNAME, exp.getMessage()));
            HelpFormatter formatter = new HelpFormatter();
            formatter.printHelp("java " + CLASSNAME, options);
        }
    }

    private static void runLinter(List<String> command) throws IOException {
        LOG.finer("checkstyle command: " + command);

        ProcessBuilder processBuilder = new ProcessBuilder(command);
        processBuilder.redirectOutput(ProcessBuilder.Redirect.INHERIT);
        processBuilder.redirectError(ProcessBuilder.Redirect.INHERIT);
        Process pylint = processBuilder.start();

        try {
            pylint.waitFor();
        } catch (InterruptedException e) {
            throw new RuntimeException("python checkstyle command was interrupted: " + command, e);
        }

        if (pylint.exitValue() == 30) {
            LOG.warning("python checkstyle detected bad styles.");
            // SUPPRESS CHECKSTYLE RegexpSinglelineJava
            System.exit(1);
        }

        if (pylint.exitValue() != 0) {
            throw new RuntimeException("python checkstyle command failed with status " + pylint.exitValue());
        }
    }

    @SuppressWarnings("unchecked")
    private static Collection<String> getSourceFiles(String extraActionFile) {

        ExtraActionInfo info = ExtraActionUtils.getExtraActionInfo(extraActionFile);
        SpawnInfo spawnInfo = info.getExtension(SpawnInfo.spawnInfo);

        return Collections2.filter(spawnInfo.getInputFileList(),
                Predicates.and(Predicates.containsPattern(".*/src/.+\\.py[c]{0,1}$"),
                        Predicates.not(Predicates.containsPattern("3rdparty/"))));
    }
}