com.google.gerrit.httpd.raw.BuckUtils.java Source code

Introduction

Here is the source code for com.google.gerrit.httpd.raw.BuckUtils.java
Source

// Copyright (C) 2015 The Android Open Source Project
//
// 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.google.gerrit.httpd.raw;

import static com.google.common.base.MoreObjects.firstNonNull;
import static java.nio.charset.StandardCharsets.UTF_8;

import com.google.common.escape.Escaper;
import com.google.common.html.HtmlEscapers;
import com.google.common.io.ByteStreams;
import com.google.gerrit.common.TimeUtil;
import com.google.gwtexpui.server.CacheHeaders;

import org.eclipse.jgit.util.RawParseUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStream;
import java.io.InterruptedIOException;
import java.io.PrintWriter;
import java.nio.file.Files;
import java.nio.file.NoSuchFileException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Properties;

import javax.servlet.http.HttpServletResponse;

class BuckUtils {
    private static final Logger log = LoggerFactory.getLogger(BuckUtils.class);

    static void build(Path root, Path gen, String target) throws IOException, BuildFailureException {
        log.info("buck build " + target);
        Properties properties = loadBuckProperties(gen);
        String buck = firstNonNull(properties.getProperty("buck"), "buck");
        ProcessBuilder proc = new ProcessBuilder(buck, "build", target).directory(root.toFile())
                .redirectErrorStream(true);
        if (properties.containsKey("PATH")) {
            proc.environment().put("PATH", properties.getProperty("PATH"));
        }
        long start = TimeUtil.nowMs();
        Process rebuild = proc.start();
        byte[] out;
        try (InputStream in = rebuild.getInputStream()) {
            out = ByteStreams.toByteArray(in);
        } finally {
            rebuild.getOutputStream().close();
        }

        int status;
        try {
            status = rebuild.waitFor();
        } catch (InterruptedException e) {
            throw new InterruptedIOException("interrupted waiting for " + buck);
        }
        if (status != 0) {
            throw new BuildFailureException(out);
        }

        long time = TimeUtil.nowMs() - start;
        log.info(String.format("UPDATED    %s in %.3fs", target, time / 1000.0));
    }

    private static Properties loadBuckProperties(Path gen) throws IOException {
        Properties properties = new Properties();
        Path p = gen.resolve(Paths.get("tools/buck/buck.properties"));
        try (InputStream in = Files.newInputStream(p)) {
            properties.load(in);
        } catch (NoSuchFileException e) {
            // Ignore; will be run from PATH, with a descriptive error if it fails.
        }
        return properties;
    }

    static void displayFailure(String rule, byte[] why, HttpServletResponse res) throws IOException {
        res.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
        res.setContentType("text/html");
        res.setCharacterEncoding(UTF_8.name());
        CacheHeaders.setNotCacheable(res);

        Escaper html = HtmlEscapers.htmlEscaper();
        try (PrintWriter w = res.getWriter()) {
            w.write("<html><title>BUILD FAILED</title><body>");
            w.format("<h1>%s FAILED</h1>", html.escape(rule));
            w.write("<pre>");
            w.write(html.escape(RawParseUtils.decode(why)));
            w.write("</pre>");
            w.write("</body></html>");
        }
    }

    static class BuildFailureException extends Exception {
        private static final long serialVersionUID = 1L;

        final byte[] why;

        BuildFailureException(byte[] why) {
            this.why = why;
        }
    }
}