com.google.devtools.build.lib.remote.FakeImmutableCacheByteStreamImpl.java Source code

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Here is the source code for com.google.devtools.build.lib.remote.FakeImmutableCacheByteStreamImpl.java

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// Copyright 2017 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.remote;

import static com.google.common.truth.Truth.assertThat;

import com.google.bytestream.ByteStreamGrpc.ByteStreamImplBase;
import com.google.bytestream.ByteStreamProto.ReadRequest;
import com.google.bytestream.ByteStreamProto.ReadResponse;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.remoteexecution.v1test.Digest;
import com.google.protobuf.ByteString;
import io.grpc.Status;
import io.grpc.stub.StreamObserver;
import java.util.HashMap;
import java.util.Map;

class FakeImmutableCacheByteStreamImpl extends ByteStreamImplBase {
    private final Map<ReadRequest, ReadResponse> cannedReplies;
    private final Map<ReadRequest, Integer> numErrors;
    // Start returning the correct response after this number of errors is reached.
    private static final int MAX_ERRORS = 3;

    public FakeImmutableCacheByteStreamImpl(Map<Digest, String> contents) {
        ImmutableMap.Builder<ReadRequest, ReadResponse> b = ImmutableMap.builder();
        for (Map.Entry<Digest, String> e : contents.entrySet()) {
            b.put(ReadRequest.newBuilder()
                    .setResourceName("blobs/" + e.getKey().getHash() + "/" + e.getKey().getSizeBytes()).build(),
                    ReadResponse.newBuilder().setData(ByteString.copyFromUtf8(e.getValue())).build());
        }
        cannedReplies = b.build();
        numErrors = new HashMap<>();
    }

    public FakeImmutableCacheByteStreamImpl(Digest digest, String contents) {
        this(ImmutableMap.of(digest, contents));
    }

    public FakeImmutableCacheByteStreamImpl(Digest d1, String c1, Digest d2, String c2) {
        this(ImmutableMap.of(d1, c1, d2, c2));
    }

    @Override
    public void read(ReadRequest request, StreamObserver<ReadResponse> responseObserver) {
        assertThat(cannedReplies.containsKey(request)).isTrue();
        int errCount = numErrors.getOrDefault(request, 0);
        if (errCount < MAX_ERRORS) {
            numErrors.put(request, errCount + 1);
            responseObserver.onError(Status.UNAVAILABLE.asRuntimeException()); // Retriable error.
        } else {
            responseObserver.onNext(cannedReplies.get(request));
            responseObserver.onCompleted();
        }
    }
}