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// Copyright 2014 Google Inc. 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.google.devtools.build.lib.bazel.repository;
import com.google.devtools.build.lib.bazel.repository.RepositoryFunction.RepositoryFunctionException;
import com.google.devtools.build.lib.packages.AggregatingAttributeMapper;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.packages.Type;
import com.google.devtools.build.lib.skyframe.FileValue;
import com.google.devtools.build.lib.skyframe.RepositoryValue;
import com.google.devtools.build.lib.syntax.EvalException;
import com.google.devtools.build.lib.vfs.FileSystemUtils;
import com.google.devtools.build.lib.vfs.Path;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyFunctionException;
import com.google.devtools.build.skyframe.SkyFunctionName;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Objects;
import javax.annotation.Nullable;
/**
* Downloads an archive file over HTTP.
*/
public class HttpDownloadFunction implements SkyFunction {
public static final String NAME = "HTTP_DOWNLOAD";
@Nullable
@Override
public SkyValue compute(SkyKey skyKey, Environment env) throws RepositoryFunctionException {
HttpDescriptor descriptor = (HttpDescriptor) skyKey.argument();
try {
FileSystemUtils.createDirectoryAndParents(descriptor.outputDirectory);
} catch (IOException e) {
throw new RepositoryFunctionException(e, SkyFunctionException.Transience.TRANSIENT);
}
FileValue repositoryValue = RepositoryFunction.getRepositoryDirectory(
descriptor.outputDirectory, env);
if (repositoryValue == null) {
System.out.println("Returning null");
return null;
}
Path archive;
try {
archive = new HttpDownloader(descriptor.url, descriptor.sha256, descriptor.outputDirectory)
.download();
} catch (IOException e) {
throw new RepositoryFunctionException(new IOException("Error downloading from "
+ descriptor.url + " to " + descriptor.outputDirectory + ": " + e.getMessage()),
SkyFunctionException.Transience.TRANSIENT);
}
return new RepositoryValue(archive, repositoryValue);
}
@Nullable
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
public static SkyKey key(Rule rule, Path outputDirectory)
throws RepositoryFunction.RepositoryFunctionException {
AggregatingAttributeMapper mapper = AggregatingAttributeMapper.of(rule);
URL url = null;
try {
url = new URL(mapper.get("url", Type.STRING));
} catch (MalformedURLException e) {
throw new RepositoryFunction.RepositoryFunctionException(
new EvalException(rule.getLocation(), "Error parsing URL: " + e.getMessage()),
SkyFunctionException.Transience.PERSISTENT);
}
String sha256 = mapper.get("sha256", Type.STRING);
return new SkyKey(
SkyFunctionName.computed(NAME),
new HttpDownloadFunction.HttpDescriptor(url, sha256, outputDirectory));
}
static final class HttpDescriptor {
private URL url;
private String sha256;
private Path outputDirectory;
public HttpDescriptor(URL url, String sha256, Path outputDirectory) {
this.url = url;
this.sha256 = sha256;
this.outputDirectory = outputDirectory;
}
@Override
public String toString() {
return url + " -> " + outputDirectory + " (" + sha256 + ")";
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof HttpDescriptor)) {
return false;
}
HttpDescriptor other = (HttpDescriptor) obj;
return Objects.equals(url, other.url)
&& Objects.equals(sha256, other.sha256)
&& Objects.equals(outputDirectory, other.outputDirectory);
}
@Override
public int hashCode() {
return Objects.hash(url, sha256, outputDirectory);
}
}
}
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