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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.
return TextFormat.parse(policy, InvocationPolicy.class);
}
} catch (InvalidProtocolBufferException | TextFormat.ParseException e) {
throw new OptionsParsingException("Malformed value of --invocation_policy: " + policy, e);
}
}
}