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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.common.collect.ImmutableMap;
import com.google.devtools.build.lib.analysis.BlazeDirectories;
import com.google.devtools.build.lib.bazel.repository.RepositoryFunction.RepositoryFunctionException;
import com.google.devtools.build.lib.cmdline.PackageIdentifier.RepositoryName;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.packages.NoSuchPackageException;
import com.google.devtools.build.lib.packages.Rule;
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.Path;
import com.google.devtools.build.skyframe.SkyFunction;
import com.google.devtools.build.skyframe.SkyFunctionException;
import com.google.devtools.build.skyframe.SkyFunctionException.Transience;
import com.google.devtools.build.skyframe.SkyKey;
import com.google.devtools.build.skyframe.SkyValue;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* Implements delegation to the correct repository fetcher.
*/
public class RepositoryDelegatorFunction implements SkyFunction {
// Mapping of rule class name to SkyFunction.
private final ImmutableMap<String, RepositoryFunction> handlers;
// This is a reference to isFetch in BazelRepositoryModule, which tracks whether the current
// command is a fetch. Remote repository lookups are only allowed during fetches.
private final AtomicBoolean isFetch;
private final BlazeDirectories directories;
public RepositoryDelegatorFunction(
BlazeDirectories directories, ImmutableMap<String, RepositoryFunction> handlers,
AtomicBoolean isFetch) {
this.directories = directories;
this.handlers = handlers;
this.isFetch = isFetch;
}
@Override
public SkyValue compute(SkyKey skyKey, Environment env) throws SkyFunctionException {
RepositoryName repositoryName = (RepositoryName) skyKey.argument();
Rule rule = RepositoryFunction.getRule(repositoryName, null, env);
if (rule == null) {
return null;
}
// If Bazel isn't running a fetch command, we shouldn't be able to download anything. To
// prevent having to rerun fetch on server restart, we check if the external repository
// directory already exists and, if it does, just use that.
if (!isFetch.get()) {
FileValue repoRoot = RepositoryFunction.getRepositoryDirectory(
RepositoryFunction.getExternalRepositoryDirectory(directories)
.getRelative(rule.getName()), env);
if (repoRoot == null) {
return null;
}
Path repoPath = repoRoot.realRootedPath().asPath();
if (!repoPath.exists()) {
throw new RepositoryFunctionException(new IOException(
"to fix, run\n\tbazel fetch //...\nExternal repository " + repositoryName
+ " not found"),
Transience.TRANSIENT);
}
return RepositoryValue.create(repoRoot);
}
RepositoryFunction handler = handlers.get(rule.getRuleClass());
if (handler == null) {
throw new RepositoryFunctionException(new EvalException(
Location.fromFile(directories.getWorkspace().getRelative("WORKSPACE")),
"Could not find handler for " + rule), Transience.PERSISTENT);
}
SkyKey key = new SkyKey(handler.getSkyFunctionName(), repositoryName);
try {
return env.getValueOrThrow(
key, NoSuchPackageException.class, IOException.class, EvalException.class);
} catch (NoSuchPackageException e) {
throw new RepositoryFunctionException(e, Transience.PERSISTENT);
} catch (IOException e) {
throw new RepositoryFunctionException(e, Transience.PERSISTENT);
} catch (EvalException e) {
throw new RepositoryFunctionException(e, Transience.PERSISTENT);
}
}
@Override
public String extractTag(SkyKey skyKey) {
return null;
}
}
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