xds: Implementation of Unified Matcher and CEL Integration #12640
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| Original file line number | Diff line number | Diff line change |
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| /* | ||
| * Copyright 2026 The gRPC Authors | ||
| * | ||
| * 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. | ||
| */ | ||
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| package io.grpc.xds.internal.matcher; | ||
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| import dev.cel.common.CelAbstractSyntaxTree; | ||
| import dev.cel.common.CelOptions; | ||
| import dev.cel.common.types.SimpleType; | ||
| import dev.cel.compiler.CelCompiler; | ||
| import dev.cel.compiler.CelCompilerFactory; | ||
| import dev.cel.runtime.CelRuntime; | ||
| import dev.cel.runtime.CelRuntimeFactory; | ||
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| /** | ||
| * Shared utilities for CEL-based matchers and extractors. | ||
| */ | ||
| final class CelCommon { | ||
| private static final CelOptions CEL_OPTIONS = CelOptions.newBuilder() | ||
| .enableComprehension(false) | ||
| .enableStringConversion(false) | ||
| .enableStringConcatenation(false) | ||
| .enableListConcatenation(false) | ||
|
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This is the preferred mechanism, as it gives you more custom control over what functions/overloads are exposed. It's the direction cel-go went too, so this is likely desirable from a consistency standpoint as well. |
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| .maxRegexProgramSize(100) | ||
| .build(); | ||
| static final CelCompiler COMPILER = CelCompilerFactory.standardCelCompilerBuilder() | ||
| .addVar("request", SimpleType.DYN) | ||
| .setOptions(CEL_OPTIONS) | ||
| .build(); | ||
| static final CelRuntime RUNTIME = CelRuntimeFactory.standardCelRuntimeBuilder() | ||
| .setOptions(CEL_OPTIONS) | ||
| .build(); | ||
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| private CelCommon() {} | ||
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| static void checkAllowedVariables(CelAbstractSyntaxTree ast) { | ||
| for (java.util.Map.Entry<Long, dev.cel.common.ast.CelReference> entry : | ||
| ast.getReferenceMap().entrySet()) { | ||
| dev.cel.common.ast.CelReference ref = entry.getValue(); | ||
| // If overload_id is empty, it's a variable reference or type name. | ||
| // We only support "request". | ||
| if (!ref.value().isPresent() && ref.overloadIds().isEmpty()) { | ||
| if (!"request".equals(ref.name())) { | ||
| throw new IllegalArgumentException( | ||
| "CEL expression references unknown variable: " + ref.name()); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| /* | ||
| * Copyright 2026 The gRPC Authors | ||
| * | ||
| * 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. | ||
| */ | ||
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| package io.grpc.xds.internal.matcher; | ||
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| import com.google.common.annotations.VisibleForTesting; | ||
| import dev.cel.common.CelAbstractSyntaxTree; | ||
| import dev.cel.common.CelValidationException; | ||
| import dev.cel.common.types.SimpleType; | ||
| import dev.cel.runtime.CelEvaluationException; | ||
| import dev.cel.runtime.CelRuntime; | ||
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| /** | ||
| * Executes compiled CEL expressions. | ||
| */ | ||
| public final class CelMatcher { | ||
| private final CelRuntime.Program program; | ||
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| private CelMatcher(CelRuntime.Program program) { | ||
| this.program = program; | ||
| } | ||
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| /** | ||
| * Compiles the AST into a CelMatcher. | ||
| */ | ||
| public static CelMatcher compile(CelAbstractSyntaxTree ast) | ||
| throws CelValidationException, CelEvaluationException { | ||
| if (ast.getResultType() != SimpleType.BOOL) { | ||
| throw new IllegalArgumentException( | ||
| "CEL expression must evaluate to boolean, got: " + ast.getResultType()); | ||
| } | ||
| CelCommon.checkAllowedVariables(ast); | ||
| CelRuntime.Program program = CelCommon.RUNTIME.createProgram(ast); | ||
| return new CelMatcher(program); | ||
| } | ||
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| /** | ||
| * Compiles the CEL expression string into a CelMatcher. | ||
| */ | ||
| @VisibleForTesting | ||
| public static CelMatcher compile(String expression) | ||
| throws CelValidationException, CelEvaluationException { | ||
| CelAbstractSyntaxTree ast = CelCommon.COMPILER.compile(expression).getAst(); | ||
| return compile(ast); | ||
| } | ||
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| /** | ||
| * Evaluates the CEL expression against the input activation. | ||
| */ | ||
| public boolean match(Object input) throws CelEvaluationException { | ||
| Object result; | ||
| if (input instanceof dev.cel.runtime.CelVariableResolver) { | ||
| result = program.eval((dev.cel.runtime.CelVariableResolver) input); | ||
| } else if (input instanceof java.util.Map) { | ||
| @SuppressWarnings("unchecked") | ||
| java.util.Map<String, ?> mapInput = (java.util.Map<String, ?>) input; | ||
| result = program.eval(mapInput); | ||
| } else { | ||
| throw new CelEvaluationException( | ||
| "Unsupported input type for CEL evaluation: " + input.getClass().getName()); | ||
| } | ||
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| if (result instanceof Boolean) { | ||
| return (Boolean) result; | ||
| } | ||
| throw new CelEvaluationException( | ||
| "CEL expression must evaluate to boolean, got: " + result.getClass().getName()); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,80 @@ | ||
| /* | ||
| * Copyright 2026 The gRPC Authors | ||
| * | ||
| * 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. | ||
| */ | ||
|
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| package io.grpc.xds.internal.matcher; | ||
|
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| import dev.cel.common.CelAbstractSyntaxTree; | ||
| import dev.cel.common.CelValidationException; | ||
| import dev.cel.common.types.SimpleType; | ||
| import dev.cel.runtime.CelEvaluationException; | ||
| import dev.cel.runtime.CelRuntime; | ||
|
|
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| /** | ||
| * Executes compiled CEL expressions that extract a string. | ||
| */ | ||
| public final class CelStringExtractor { | ||
| private final CelRuntime.Program program; | ||
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| private CelStringExtractor(CelRuntime.Program program) { | ||
| this.program = program; | ||
| } | ||
|
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| /** | ||
| * Compiles the AST into a CelStringExtractor. | ||
| */ | ||
| public static CelStringExtractor compile(CelAbstractSyntaxTree ast) | ||
| throws CelValidationException, CelEvaluationException { | ||
| if (ast.getResultType() != SimpleType.STRING && ast.getResultType() != SimpleType.DYN) { | ||
| throw new IllegalArgumentException( | ||
| "CEL expression must evaluate to string, got: " + ast.getResultType()); | ||
| } | ||
| CelCommon.checkAllowedVariables(ast); | ||
| CelRuntime.Program program = CelCommon.RUNTIME.createProgram(ast); | ||
| return new CelStringExtractor(program); | ||
| } | ||
|
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| /** | ||
| * Compiles the CEL expression string into a CelStringExtractor. | ||
| */ | ||
| public static CelStringExtractor compile(String expression) | ||
| throws CelValidationException, CelEvaluationException { | ||
| CelAbstractSyntaxTree ast = CelCommon.COMPILER.compile(expression).getAst(); | ||
| return compile(ast); | ||
| } | ||
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| /** | ||
| * Evaluates the CEL expression against the input activation and returns the string result. | ||
| * Returns null if the result is not a string. | ||
| */ | ||
| public String extract(Object input) throws CelEvaluationException { | ||
| Object result; | ||
| if (input instanceof dev.cel.runtime.CelVariableResolver) { | ||
| result = program.eval((dev.cel.runtime.CelVariableResolver) input); | ||
| } else if (input instanceof java.util.Map) { | ||
| @SuppressWarnings("unchecked") | ||
| java.util.Map<String, ?> mapInput = (java.util.Map<String, ?>) input; | ||
| result = program.eval(mapInput); | ||
| } else { | ||
| throw new CelEvaluationException( | ||
| "Unsupported input type for CEL evaluation: " + input.getClass().getName()); | ||
| } | ||
|
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| if (result instanceof String) { | ||
| return (String) result; | ||
| } | ||
| return null; | ||
| } | ||
| } |
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If you plan on using both the compilation and runtime packages, you could consider just taking a dependency on
dev.cel:celinstead, which includes both. It will likely make your dependency management much easier.On a separate note -- let me know if you'd like us to cut a new release.