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 com.google.common.collect.ImmutableSet; | ||
| import dev.cel.common.CelAbstractSyntaxTree; | ||
| import dev.cel.common.CelOptions; | ||
| import dev.cel.common.ast.CelReference; | ||
| import dev.cel.runtime.CelRuntime; | ||
| import dev.cel.runtime.CelRuntimeFactory; | ||
| import dev.cel.runtime.CelStandardFunctions; | ||
| import dev.cel.runtime.CelStandardFunctions.StandardFunction; | ||
| import dev.cel.runtime.standard.AddOperator.AddOverload; | ||
| import java.util.Map; | ||
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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) | ||
| .maxRegexProgramSize(100) | ||
| .build(); | ||
| private static final String REQUEST_VARIABLE = "request"; | ||
| private static final CelStandardFunctions FUNCTIONS = | ||
| CelStandardFunctions.newBuilder() | ||
| .filterFunctions((func, over) -> { | ||
| if (func == StandardFunction.STRING) { | ||
| return false; | ||
| } | ||
| if (func == StandardFunction.ADD) { | ||
| return !over.equals(AddOverload.ADD_STRING) | ||
| && !over.equals(AddOverload.ADD_LIST); | ||
| } | ||
| return true; | ||
|
shivaspeaks marked this conversation as resolved.
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| }) | ||
| .build(); | ||
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|
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| /** | ||
| * Set of allowed function names based on gRFC A106. | ||
| */ | ||
| private static final ImmutableSet<String> ALLOWED_FUNCTIONS = ImmutableSet.of( | ||
| "size", "matches", "contains", "startsWith", "endsWith", "timestamp", "duration", | ||
|
Contributor
There was a problem hiding this comment. The overload ids for standard functions will have suffixes like size_string, size_int64, etc and we should check that the overload id starts with one of these rather than use |
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| "int", "uint", "double", "bytes", "bool", "==", "!=", ">", "<", ">=", "<=", | ||
| "&&", "||", "!", "+", "-", "*", "/", "%", "in", "has", "or", "equals", | ||
| "index_map", "divide_int64", "int64_to_int64", "uint64_to_int64", | ||
| "double_to_int64", "string_to_int64", "timestamp_to_int64"); | ||
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| static final CelRuntime RUNTIME = CelRuntimeFactory.standardCelRuntimeBuilder() | ||
| .setStandardEnvironmentEnabled(false) | ||
| .setStandardFunctions(FUNCTIONS) | ||
| .setOptions(CEL_OPTIONS) | ||
| .build(); | ||
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| private CelCommon() {} | ||
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| /** | ||
| * Validates that the AST only references the allowed variable ("request") | ||
| * and supported functions as defined in gRFC A106. | ||
| */ | ||
| static void checkAllowedReferences(CelAbstractSyntaxTree ast) { | ||
| for (Map.Entry<Long, CelReference> entry : ast.getReferenceMap().entrySet()) { | ||
| CelReference ref = entry.getValue(); | ||
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| // Check for variables (where overloadIds is empty) | ||
| if (!ref.value().isPresent() && ref.overloadIds().isEmpty()) { | ||
| if (!REQUEST_VARIABLE.equals(ref.name())) { | ||
| throw new IllegalArgumentException( | ||
| "CEL expression references unknown variable: " + ref.name()); | ||
| } | ||
| } else if (!ref.overloadIds().isEmpty()) { | ||
| String name = ref.name(); | ||
| if (name.isEmpty()) { | ||
| boolean allowed = false; | ||
| for (String id : ref.overloadIds()) { | ||
| if (ALLOWED_FUNCTIONS.contains(id)) { | ||
| allowed = true; | ||
|
Contributor
There was a problem hiding this comment. We should check for all overload ids in the list. |
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| break; | ||
| } | ||
| } | ||
| if (!allowed) { | ||
| throw new IllegalArgumentException( | ||
| "CEL expression references unknown function with overload IDs: " | ||
| + ref.overloadIds()); | ||
| } | ||
| } else if (!ALLOWED_FUNCTIONS.contains(name)) { | ||
|
Contributor
There was a problem hiding this comment. Change the logic to reject any non-empty name when overloadIds is present. Because if a reference has a name, it's not a standard operator or a variable (handled by the first if), so it must be something we don't support, such as custom functions.
Member
Author
There was a problem hiding this comment. Oh, so standard allowed functions never have a name in the AST, so we should remove ALLOWED_FUNCTIONS, which is now an obsolete list here? |
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| throw new IllegalArgumentException( | ||
| "CEL expression references unknown function: " + name); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,70 @@ | ||
| /* | ||
| * 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.types.SimpleType; | ||
| import dev.cel.runtime.CelEvaluationException; | ||
| import dev.cel.runtime.CelRuntime; | ||
| import dev.cel.runtime.CelVariableResolver; | ||
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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. | ||
| * Throws an Exception if evaluation fails during compilation setup. | ||
| */ | ||
| public static CelMatcher compile(CelAbstractSyntaxTree ast) | ||
| throws CelEvaluationException { | ||
| // CelEvaluationException -> inside cel-runtime -> Allowed in production signatures | ||
| // CelValidationException -> inside cel-compiler -> Forbidden in production signatures | ||
| if (ast.getResultType() != SimpleType.BOOL) { | ||
| throw new IllegalArgumentException( | ||
| "CEL expression must evaluate to boolean, got: " + ast.getResultType()); | ||
| } | ||
| CelCommon.checkAllowedReferences(ast); | ||
| CelRuntime.Program program = CelCommon.RUNTIME.createProgram(ast); | ||
| return new CelMatcher(program); | ||
| } | ||
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| /** | ||
| * Evaluates the CEL expression against the input activation. | ||
| */ | ||
| public boolean match(Object input) throws CelEvaluationException { | ||
| Object result; | ||
| if (input instanceof CelVariableResolver) { | ||
| result = program.eval((CelVariableResolver) input); | ||
| } 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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