com.google.devtools.common.options.InvocationPolicyParser.java Source code

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Here is the source code for com.google.devtools.common.options.InvocationPolicyParser.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.common.options;

import com.google.common.base.CharMatcher;
import com.google.common.base.Strings;
import com.google.common.io.BaseEncoding;
import com.google.devtools.build.lib.runtime.proto.InvocationPolicyOuterClass.InvocationPolicy;
import com.google.protobuf.InvalidProtocolBufferException;
import com.google.protobuf.TextFormat;

/**
 * Parses the given InvocationPolicy string, which may be a base64-encoded binary-serialized
 * InvocationPolicy message, or a text formatted InvocationPolicy message. Note that the text
 * format is not backwards compatible as the binary format is.
 */
public class InvocationPolicyParser {
    /**
     * Parses InvocationPolicy in either of the accepted formats. Returns an empty policy if no policy
     * is provided.
     *
     * @throws com.google.devtools.common.options.OptionsParsingException if the value of
     *     --invocation_policy is invalid.
     */
    public static InvocationPolicy parsePolicy(String policy) throws OptionsParsingException {
        if (Strings.isNullOrEmpty(policy)) {
            return InvocationPolicy.getDefaultInstance();
        }

        try {
            try {
                // First try decoding the policy as a base64 encoded binary proto.
                return InvocationPolicy
                        .parseFrom(BaseEncoding.base64().decode(CharMatcher.whitespace().removeFrom(policy)));
            } catch (IllegalArgumentException e) {
                // If the flag value can't be decoded from base64, try decoding the policy as a text
                // formatted proto.
                InvocationPolicy.Builder builder = InvocationPolicy.newBuilder();
                TextFormat.merge(policy, builder);
                return builder.build();
            }
        } catch (InvalidProtocolBufferException | TextFormat.ParseException e) {
            throw new OptionsParsingException("Malformed value of --invocation_policy: " + policy, e);
        }
    }
}