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/*
* Tencent is pleased to support the open source community by making Polaris available.
*
* Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
*
* Licensed under the BSD 3-Clause License (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://opensource.org/licenses/BSD-3-Clause
*
* 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.tencent.polaris.ratelimit.client.codec;
import com.google.protobuf.StringValue;
import com.tencent.polaris.api.plugin.registry.AbstractCacheHandler;
import com.tencent.polaris.api.pojo.RegistryCacheValue;
import com.tencent.polaris.api.pojo.ServiceEventKey.EventType;
import com.tencent.polaris.api.utils.CollectionUtils;
import com.tencent.polaris.api.utils.RuleUtils;
import com.tencent.polaris.api.utils.StringUtils;
import com.tencent.polaris.client.pb.ModelProto.MatchString;
import com.tencent.polaris.client.pb.RateLimitProto.MatchArgument;
import com.tencent.polaris.client.pb.RateLimitProto.MatchArgument.Type;
import com.tencent.polaris.client.pb.RateLimitProto.RateLimit;
import com.tencent.polaris.client.pb.RateLimitProto.Rule;
import com.tencent.polaris.client.pb.ResponseProto.DiscoverResponse;
import com.tencent.polaris.client.pojo.ServiceRuleByProto;
import com.tencent.polaris.ratelimit.api.rpc.RateLimitConsts;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
public class RateLimitingCacheHandler extends AbstractCacheHandler {
@Override
public EventType getTargetEventType() {
return EventType.RATE_LIMITING;
}
@Override
protected String getRevision(DiscoverResponse discoverResponse) {
RateLimit rateLimit = discoverResponse.getRateLimit();
if (null == rateLimit) {
return "";
}
return rateLimit.getRevision().getValue();
}
@Override
public RegistryCacheValue messageToCacheValue(RegistryCacheValue oldValue, Object newValue, boolean isCacheLoaded) {
DiscoverResponse discoverResponse = (DiscoverResponse) newValue;
RateLimit rateLimit = discoverResponse.getRateLimit();
String revision = getRevision(discoverResponse);
//需要做一次排序,PB中的数据不可变，需要单独构建一份
List sortedRules = unifiedRules(rateLimit.getRulesList());
sortedRules.sort(RateLimitingCacheHandler::compareRule);
Collections.reverse(sortedRules);
RateLimit newRateLimit = RateLimit.newBuilder().addAllRules(sortedRules)
.setRevision(StringValue.newBuilder().setValue(revision).build()).build();
return new ServiceRuleByProto(newRateLimit, revision, isCacheLoaded, getTargetEventType());
}
private static final int RULE_SERVICE_LEVEL = 1;
private static final int RULE_METHOD_LEVEL = 2;
private static final int RULE_ARGUMENT_LEVEL = 3;
private static int getRuleLevel(Rule rule) {
MatchString method = rule.getMethod();
List argumentsList = rule.getArgumentsList();
if (CollectionUtils.isNotEmpty(argumentsList)) {
return RULE_ARGUMENT_LEVEL + argumentsList.size();
}
if (null != method && !RuleUtils.isMatchAllValue(method)) {
return RULE_METHOD_LEVEL;
}
return RULE_SERVICE_LEVEL;
}
private static int compareRule(Rule rule1, Rule rule2) {
Rule.Type type1 = rule1.getType();
Rule.Type type2 = rule2.getType();
if (type1 != type2) {
return type1.getNumber() - type2.getNumber();
}
return getRuleLevel(rule1) - getRuleLevel(rule2);
}
private List unifiedRules(List rules) {
List retRules = new ArrayList<>();
if (CollectionUtils.isEmpty(rules)) {
return rules;
}
for (Rule rule : rules) {
if (CollectionUtils.isEmpty(rule.getLabelsMap())) {
// not labels, nothing to convert
retRules.add(rule);
continue;
}
if (CollectionUtils.isNotEmpty(rule.getArgumentsList())) {
// new server version, already transfer to arguments
retRules.add(rule);
continue;
}
// transfer the labels to arguments
List arguments = new ArrayList<>();
for (Map.Entry entry : rule.getLabelsMap().entrySet()) {
String labelKey = StringUtils.defaultString(entry.getKey());
if (StringUtils.equals(labelKey, RateLimitConsts.LABEL_KEY_METHOD)) {
arguments.add(MatchArgument.newBuilder().setType(Type.METHOD).setValue(entry.getValue()).build());
} else if (StringUtils.equals(labelKey, RateLimitConsts.LABEL_KEY_CALLER_IP)) {
arguments
.add(MatchArgument.newBuilder().setType(Type.CALLER_IP).setValue(entry.getValue()).build());
} else if (labelKey.startsWith(RateLimitConsts.LABEL_KEY_HEADER)) {
arguments
.add(MatchArgument.newBuilder().setType(Type.HEADER)
.setKey(labelKey.substring(RateLimitConsts.LABEL_KEY_HEADER.length()))
.setValue(entry.getValue()).build());
} else if (labelKey.startsWith(RateLimitConsts.LABEL_KEY_QUERY)) {
arguments
.add(MatchArgument.newBuilder().setType(Type.QUERY)
.setKey(labelKey.substring(RateLimitConsts.LABEL_KEY_QUERY.length()))
.setValue(entry.getValue()).build());
} else if (labelKey.startsWith(RateLimitConsts.LABEL_KEY_CALLER_SERVICE)) {
arguments
.add(MatchArgument.newBuilder().setType(Type.CALLER_SERVICE)
.setKey(labelKey.substring(RateLimitConsts.LABEL_KEY_CALLER_SERVICE.length()))
.setValue(entry.getValue()).build());
} else {
arguments
.add(MatchArgument.newBuilder().setType(Type.CUSTOM)
.setKey(labelKey).setValue(entry.getValue()).build());
}
}
Rule.Builder retRule = Rule.newBuilder().mergeFrom(rule).addAllArguments(arguments);
retRules.add(retRule.build());
}
return retRules;
}
}