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; | ||
|
|
||
| /** | ||
| * 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; | ||
|
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There was a problem hiding this comment. Just 2 cases! It's fine to use either. I would have considered if there were more cases. |
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| }) | ||
| .build(); | ||
|
|
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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", | ||
| "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(); | ||
|
|
||
| // 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; | ||
| break; | ||
| } | ||
| } | ||
| if (!allowed) { | ||
| throw new IllegalArgumentException( | ||
| "CEL expression references unknown function with overload IDs: " | ||
| + ref.overloadIds()); | ||
| } | ||
| } else if (!ALLOWED_FUNCTIONS.contains(name)) { | ||
| throw new IllegalArgumentException( | ||
| "CEL expression references unknown function: " + name); | ||
| } | ||
| } | ||
| } | ||
| } | ||
| } | ||
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For educational purpose - Why is this
100, should we extract it out in constant?There was a problem hiding this comment.
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Not entirely sure but by any chance should this be configurable?
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This is coming from grfc:
Per is go/java-practices/constants we should use inlined literal.