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[6.4.0] Fetch
RepoSpecs in parallel (#19354)
Computing `RepoSpec`s for all selected Bazel modules is on the critical path for the computation of the main repository mapping and thus benefits from parallelized downloads. On my machine, this change has the following effect on `bazel build //src:bazel-dev --enable_bzlmod --nobuild`: ``` before compute main repo mapping: 8s 127ms after compute main repo mapping: 4s 226ms ``` Closes #19294. Commit 8a68310 PiperOrigin-RevId: 559819452 Change-Id: Ieef957fcfe402c909d2863ba4a4ca3540781a56d
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73 changes: 73 additions & 0 deletions
73
src/main/java/com/google/devtools/build/lib/bazel/bzlmod/RepoSpecFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,73 @@ | ||
| // Copyright 2021 The Bazel Authors. 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.bzlmod; | ||
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|
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| import com.google.devtools.build.lib.profiler.Profiler; | ||
| import com.google.devtools.build.lib.profiler.ProfilerTask; | ||
| import com.google.devtools.build.lib.profiler.SilentCloseable; | ||
| import com.google.devtools.build.lib.server.FailureDetails; | ||
| import com.google.devtools.build.skyframe.SkyFunction; | ||
| import com.google.devtools.build.skyframe.SkyFunctionException; | ||
| import com.google.devtools.build.skyframe.SkyKey; | ||
| import com.google.devtools.build.skyframe.SkyValue; | ||
| import java.io.IOException; | ||
| import java.net.URISyntaxException; | ||
| import javax.annotation.Nullable; | ||
|
|
||
| /** | ||
| * A simple SkyFunction that computes a {@link RepoSpec} for the given {@link InterimModule} by | ||
| * fetching required information from its {@link Registry}. | ||
| */ | ||
| public class RepoSpecFunction implements SkyFunction { | ||
| private final RegistryFactory registryFactory; | ||
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|
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| public RepoSpecFunction(RegistryFactory registryFactory) { | ||
| this.registryFactory = registryFactory; | ||
| } | ||
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| @Override | ||
| @Nullable | ||
| public SkyValue compute(SkyKey skyKey, Environment env) | ||
| throws InterruptedException, RepoSpecException { | ||
| RepoSpecKey key = (RepoSpecKey) skyKey.argument(); | ||
| try (SilentCloseable c = | ||
| Profiler.instance() | ||
| .profile(ProfilerTask.BZLMOD, () -> "compute repo spec: " + key.getModuleKey())) { | ||
| return registryFactory | ||
| .getRegistryWithUrl(key.getRegistryUrl()) | ||
| .getRepoSpec( | ||
| key.getModuleKey(), key.getModuleKey().getCanonicalRepoName(), env.getListener()); | ||
| } catch (IOException e) { | ||
| throw new RepoSpecException( | ||
| ExternalDepsException.withCauseAndMessage( | ||
| FailureDetails.ExternalDeps.Code.ERROR_ACCESSING_REGISTRY, | ||
| e, | ||
| "Unable to get module repo spec for %s from registry", | ||
| key.getModuleKey())); | ||
| } catch (URISyntaxException e) { | ||
| // This should never happen since we obtain the registry URL from an already constructed | ||
| // registry. | ||
| throw new IllegalStateException(e); | ||
| } | ||
| } | ||
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| static final class RepoSpecException extends SkyFunctionException { | ||
|
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| RepoSpecException(ExternalDepsException cause) { | ||
| super(cause, Transience.TRANSIENT); | ||
| } | ||
| } | ||
| } |
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