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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.events.Reporter;
import com.google.devtools.build.lib.packages.AggregatingAttributeMapper;
import com.google.devtools.build.lib.packages.Rule;
import com.google.devtools.build.lib.syntax.Type;
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.util.Objects;
import javax.annotation.Nullable;
/**
* Downloads an archive file over HTTP.
*/
public class HttpDownloadFunction implements SkyFunction {
public static final SkyFunctionName NAME = SkyFunctionName.create("HTTP_DOWNLOAD");
private Reporter reporter;
public void setReporter(Reporter reporter) {
this.reporter = reporter;
}
@Nullable
@Override
public SkyValue compute(SkyKey skyKey, Environment env) throws RepositoryFunctionException {
HttpDescriptor descriptor = (HttpDescriptor) skyKey.argument();
try {
// The downloaded file is not added to Skyframe here, as changes to it do not necessarily
// affect a build (it's usually essentially a temporary file). However, if the downloaded
// file's sha256 is not the expected value on subsequent builds, this is taken as a signal
// that it must be re-downloaded. This might happen if the user deleted the downloaded file.
return new HttpDownloadValue(
new HttpDownloader(
reporter,
descriptor.url,
descriptor.sha256,
descriptor.outputDirectory,
descriptor.type)
.download());
} catch (IOException e) {
throw new RepositoryFunctionException(new IOException("Error downloading from "
+ descriptor.url + " to " + descriptor.outputDirectory + ": " + e.getMessage()),
SkyFunctionException.Transience.TRANSIENT);
}
}
@Nullable
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
public static SkyKey key(Rule rule, Path outputDirectory) {
AggregatingAttributeMapper mapper = AggregatingAttributeMapper.of(rule);
String url = mapper.get("url", Type.STRING);
String sha256 = mapper.get("sha256", Type.STRING);
String type = mapper.has("type", Type.STRING) ? mapper.get("type", Type.STRING) : "";
return new SkyKey(
NAME, new HttpDownloadFunction.HttpDescriptor(url, sha256, outputDirectory, type));
}
/** Data about a remote repository to be accessed via http. */
public static final class HttpDescriptor {
private String url;
private String sha256;
private Path outputDirectory;
private String type;
HttpDescriptor(String url, String sha256, Path outputDirectory, String type) {
this.url = url;
this.sha256 = sha256;
this.outputDirectory = outputDirectory;
this.type = type;
}
public String getSha256() {
return sha256;
}
@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)
&& Objects.equals(type, other.type);
}
@Override
public int hashCode() {
return Objects.hash(url, sha256, outputDirectory, type);
}
}
}
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