/*
 * Copyright 2017-present Facebook, Inc.
 *
 * 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.facebook.buck.distributed;

import com.facebook.buck.distributed.thrift.BuildJobStateFileHashEntry;
import com.google.common.base.Preconditions;
import com.google.common.io.ByteStreams;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Path;

public class ServerContentsProvider implements FileContentsProvider {
  private final DistBuildService service;

  public ServerContentsProvider(DistBuildService service) {
    this.service = service;
  }

  @Override
  public boolean materializeFileContents(BuildJobStateFileHashEntry entry, Path targetAbsPath)
      throws IOException {
    Preconditions.checkState(
        entry.isSetHashCode(), String.format("File hash missing for file [%s]", entry.getPath()));

    try (InputStream inputStream = service.fetchSourceFile(entry.getHashCode());
        OutputStream outputStream = InlineContentsProvider.newOutputStream(targetAbsPath)) {
      ByteStreams.copy(inputStream, outputStream);
    }

    return true;
  }
}