src/main/java/com/google/devtools/build/lib/bazel/bzlmod/RegistryFunction.java

// 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;

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.net.URISyntaxException;
import javax.annotation.Nullable;

/** A simple SkyFunction that creates a {@link Registry} with a given URL. */
public class RegistryFunction implements SkyFunction {
  private final RegistryFactory registryFactory;

  public RegistryFunction(RegistryFactory registryFactory) {
    this.registryFactory = registryFactory;
  }

  @Override
  @Nullable
  public SkyValue compute(SkyKey skyKey, Environment env)
      throws InterruptedException, RegistryException {
    BazelLockFileValue lockfile = (BazelLockFileValue) env.getValue(BazelLockFileValue.KEY);
    if (lockfile == null) {
      return null;
    }

    RegistryKey key = (RegistryKey) skyKey.argument();
    try {
      return registryFactory.createRegistry(key.getUrl(), lockfile.getRegistryFileHashes());
    } catch (URISyntaxException e) {
      throw new RegistryException(
          ExternalDepsException.withCauseAndMessage(
              FailureDetails.ExternalDeps.Code.INVALID_REGISTRY_URL,
              e,
              "Invalid registry URL: %s",
              key.getUrl()));
    }
  }

  static final class RegistryException extends SkyFunctionException {

    RegistryException(ExternalDepsException cause) {
      super(cause, Transience.TRANSIENT);
    }
  }
}