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Resource rules (flow/degrade/param/authority) support regex matching (a…
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sentinel-core/src/main/java/com/alibaba/csp/sentinel/slots/block/RuleManager.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,186 @@ | ||
| /* | ||
| * Copyright 1999-2018 Alibaba Group Holding Ltd. | ||
| * | ||
| * 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.alibaba.csp.sentinel.slots.block; | ||
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| import com.alibaba.csp.sentinel.util.function.Function; | ||
| import com.alibaba.csp.sentinel.util.function.Predicate; | ||
|
|
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| import java.util.*; | ||
| import java.util.regex.Pattern; | ||
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| /** | ||
| * Unified rule management tool, mainly used for matching and caching of regular rules and simple rules. | ||
| * @author quguai | ||
| * @date 2023/10/9 20:35 | ||
| */ | ||
| public class RuleManager<R> { | ||
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|
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| private Map<String, List<R>> originalRules = new HashMap<>(); | ||
| private Map<Pattern, List<R>> regexRules = new HashMap<>(); | ||
| private Map<String, List<R>> regexCacheRules = new HashMap<>(); | ||
| private Map<String, List<R>> simpleRules = new HashMap<>(); | ||
| private Function<List<R>, List<R>> generator = Function.identity(); | ||
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| private final Predicate<R> predicate; | ||
|
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| public RuleManager() { | ||
| predicate = r -> r instanceof AbstractRule && ((AbstractRule) r).isRegex(); | ||
| } | ||
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| public RuleManager(Function<List<R>, List<R>> generator, Predicate<R> predicate) { | ||
| this.generator = generator; | ||
| this.predicate = predicate; | ||
| } | ||
|
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| /** | ||
| * Update rules from datasource, split rules map by regex, | ||
| * rebuild the regex rule cache to reduce the performance loss caused by publish rules. | ||
| * | ||
| * @param rulesMap origin rules map | ||
| */ | ||
| public void updateRules(Map<String, List<R>> rulesMap) { | ||
| originalRules = rulesMap; | ||
| Map<Pattern, List<R>> regexRules = new HashMap<>(); | ||
| Map<String, List<R>> simpleRules = new HashMap<>(); | ||
| for (Map.Entry<String, List<R>> entry : rulesMap.entrySet()) { | ||
| String resource = entry.getKey(); | ||
| List<R> rules = entry.getValue(); | ||
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| List<R> rulesOfSimple = new ArrayList<>(); | ||
| List<R> rulesOfRegex = new ArrayList<>(); | ||
| for (R rule : rules) { | ||
| if (predicate.test(rule)) { | ||
| rulesOfRegex.add(rule); | ||
| } else { | ||
| rulesOfSimple.add(rule); | ||
| } | ||
| } | ||
| if (!rulesOfRegex.isEmpty()) { | ||
| regexRules.put(Pattern.compile(resource), rulesOfRegex); | ||
| } | ||
| if (!rulesOfSimple.isEmpty()) { | ||
| simpleRules.put(resource, rulesOfSimple); | ||
| } | ||
| } | ||
| // rebuild regex cache rules | ||
| setRules(regexRules, simpleRules); | ||
| } | ||
|
|
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| /** | ||
| * Get rules by resource name, save the rule list after regular matching to improve performance | ||
| * @param resource resource name | ||
| * @return matching rule list | ||
| */ | ||
| public List<R> getRules(String resource) { | ||
| List<R> result = new ArrayList<>(simpleRules.getOrDefault(resource, Collections.emptyList())); | ||
| if (regexRules.isEmpty()) { | ||
| return result; | ||
| } | ||
| if (regexCacheRules.containsKey(resource)) { | ||
| result.addAll(regexCacheRules.get(resource)); | ||
| return result; | ||
| } | ||
| synchronized (this) { | ||
| if (regexCacheRules.containsKey(resource)) { | ||
| result.addAll(regexCacheRules.get(resource)); | ||
| return result; | ||
| } | ||
| List<R> compilers = matcherFromRegexRules(resource); | ||
| regexCacheRules.put(resource, compilers); | ||
| result.addAll(compilers); | ||
| return result; | ||
| } | ||
| } | ||
|
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| /** | ||
| * Get rules from regex rules and simple rules | ||
| * @return rule list | ||
| */ | ||
| public List<R> getRules() { | ||
| List<R> rules = new ArrayList<>(); | ||
| for (Map.Entry<Pattern, List<R>> entry : regexRules.entrySet()) { | ||
| rules.addAll(entry.getValue()); | ||
| } | ||
| for (Map.Entry<String, List<R>> entry : simpleRules.entrySet()) { | ||
| rules.addAll(entry.getValue()); | ||
| } | ||
| return rules; | ||
| } | ||
|
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| /** | ||
| * Get origin rules, includes regex and simple rules | ||
| * @return original rules | ||
| */ | ||
| public Map<String, List<R>> getOriginalRules() { | ||
| return originalRules; | ||
| } | ||
|
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| /** | ||
| * Determine whether has rule based on the resource name | ||
| * @param resource resource name | ||
| * @return whether | ||
| */ | ||
|
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| public boolean hasConfig(String resource) { | ||
| if (resource == null) { | ||
| return false; | ||
| } | ||
| return !getRules(resource).isEmpty(); | ||
| } | ||
|
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| /** | ||
| * Is valid regex rules | ||
| * @param rule rule | ||
| * @return weather valid regex rule | ||
| */ | ||
| public static boolean checkRegexResourceField(AbstractRule rule) { | ||
| if (!rule.isRegex()) { | ||
| return true; | ||
| } | ||
| String resourceName = rule.getResource(); | ||
| try { | ||
| Pattern.compile(resourceName); | ||
| return true; | ||
| } catch (Exception e) { | ||
| return false; | ||
| } | ||
| } | ||
|
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| private List<R> matcherFromRegexRules(String resource) { | ||
| List<R> compilers = new ArrayList<>(); | ||
| for (Map.Entry<Pattern, List<R>> entry : regexRules.entrySet()) { | ||
| if (entry.getKey().matcher(resource).matches()) { | ||
| compilers.addAll(generator.apply(entry.getValue())); | ||
| } | ||
| } | ||
| return compilers; | ||
| } | ||
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| private synchronized void setRules(Map<Pattern, List<R>> regexRules, Map<String, List<R>> simpleRules) { | ||
| this.regexRules = regexRules; | ||
| this.simpleRules = simpleRules; | ||
| if (regexRules.isEmpty()) { | ||
| this.regexCacheRules = Collections.emptyMap(); | ||
| return; | ||
| } | ||
| // rebuild from regex cache rules | ||
| Map<String, List<R>> rebuildCacheRule = new HashMap<>(regexCacheRules.size()); | ||
| for (String resource : regexCacheRules.keySet()) { | ||
| rebuildCacheRule.put(resource, matcherFromRegexRules(resource)); | ||
| } | ||
| this.regexCacheRules = rebuildCacheRule; | ||
| } | ||
| } |
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