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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.plugins.circuitbreaker.composite;
import com.tencent.polaris.api.plugin.Plugin;
import com.tencent.polaris.api.plugin.cache.FlowCache;
import com.tencent.polaris.api.plugin.circuitbreaker.ResourceStat;
import com.tencent.polaris.api.plugin.circuitbreaker.entity.InstanceResource;
import com.tencent.polaris.api.plugin.circuitbreaker.entity.MethodResource;
import com.tencent.polaris.api.plugin.circuitbreaker.entity.Resource;
import com.tencent.polaris.api.plugin.circuitbreaker.entity.ServiceResource;
import com.tencent.polaris.api.plugin.common.PluginTypes;
import com.tencent.polaris.api.plugin.compose.Extensions;
import com.tencent.polaris.api.plugin.stat.DefaultCircuitBreakResult;
import com.tencent.polaris.api.plugin.stat.StatInfo;
import com.tencent.polaris.api.plugin.stat.StatReporter;
import com.tencent.polaris.api.pojo.CircuitBreakerStatus;
import com.tencent.polaris.api.pojo.CircuitBreakerStatus.FallbackInfo;
import com.tencent.polaris.api.pojo.CircuitBreakerStatus.Status;
import com.tencent.polaris.api.pojo.HalfOpenStatus;
import com.tencent.polaris.api.pojo.RetStatus;
import com.tencent.polaris.api.utils.CollectionUtils;
import com.tencent.polaris.api.utils.RuleUtils;
import com.tencent.polaris.logging.LoggerFactory;
import com.tencent.polaris.plugins.circuitbreaker.composite.trigger.ConsecutiveCounter;
import com.tencent.polaris.plugins.circuitbreaker.composite.trigger.CounterOptions;
import com.tencent.polaris.plugins.circuitbreaker.composite.trigger.ErrRateCounter;
import com.tencent.polaris.plugins.circuitbreaker.composite.trigger.TriggerCounter;
import com.tencent.polaris.specification.api.v1.fault.tolerance.CircuitBreakerProto;
import com.tencent.polaris.specification.api.v1.fault.tolerance.CircuitBreakerProto.*;
import com.tencent.polaris.specification.api.v1.fault.tolerance.CircuitBreakerProto.FallbackResponse.MessageHeader;
import com.tencent.polaris.specification.api.v1.model.ModelProto.MatchString;
import org.slf4j.Logger;
import java.util.*;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Function;
import java.util.regex.Pattern;
import static com.tencent.polaris.logging.LoggingConsts.LOGGING_CIRCUITBREAKER_EVENT;
public class ResourceCounters implements StatusChangeHandler {
private static final Logger CB_EVENT_LOG = LoggerFactory.getLogger(LOGGING_CIRCUITBREAKER_EVENT);
private static final Logger LOG = LoggerFactory.getLogger(ErrRateCounter.class);
private final CircuitBreakerProto.CircuitBreakerRule currentActiveRule;
private final List counters = new ArrayList<>();
private final Resource resource;
private final ScheduledExecutorService stateChangeExecutors;
private final AtomicReference circuitBreakerStatusReference = new AtomicReference<>();
private final FallbackInfo fallbackInfo;
private final Function regexFunction;
private Extensions extensions;
private final AtomicBoolean destroyed = new AtomicBoolean(false);
public ResourceCounters(Resource resource, CircuitBreakerRule currentActiveRule,
ScheduledExecutorService stateChangeExecutors, PolarisCircuitBreaker polarisCircuitBreaker) {
this.currentActiveRule = currentActiveRule;
this.resource = resource;
this.stateChangeExecutors = stateChangeExecutors;
this.regexFunction = regex -> {
if (null == polarisCircuitBreaker) {
return Pattern.compile(regex);
}
FlowCache flowCache = polarisCircuitBreaker.getExtensions().getFlowCache();
return flowCache.loadOrStoreCompiledRegex(regex);
};
circuitBreakerStatusReference
.set(new CircuitBreakerStatus(currentActiveRule.getName(), Status.CLOSE, System.currentTimeMillis()));
fallbackInfo = buildFallbackInfo(currentActiveRule);
if (Objects.nonNull(polarisCircuitBreaker)) {
this.extensions = polarisCircuitBreaker.getExtensions();
}
init();
}
private void init() {
List triggerConditionList = currentActiveRule.getTriggerConditionList();
for (TriggerCondition triggerCondition : triggerConditionList) {
CounterOptions counterOptions = new CounterOptions();
counterOptions.setResource(resource);
counterOptions.setTriggerCondition(triggerCondition);
counterOptions.setStatusChangeHandler(this);
counterOptions.setExecutorService(stateChangeExecutors);
switch (triggerCondition.getTriggerType()) {
case ERROR_RATE:
counters.add(new ErrRateCounter(currentActiveRule.getName(), counterOptions));
break;
case CONSECUTIVE_ERROR:
counters.add(new ConsecutiveCounter(currentActiveRule.getName(), counterOptions));
break;
default:
break;
}
}
}
private static FallbackInfo buildFallbackInfo(CircuitBreakerRule currentActiveRule) {
if (null == currentActiveRule) {
return null;
}
if (currentActiveRule.getLevel() != Level.METHOD && currentActiveRule.getLevel() != Level.SERVICE) {
return null;
}
FallbackConfig fallbackConfig = currentActiveRule.getFallbackConfig();
if (null == fallbackConfig || !fallbackConfig.getEnable()) {
return null;
}
FallbackResponse response = fallbackConfig.getResponse();
if (null == response) {
return null;
}
Map headers = new HashMap<>();
for (MessageHeader messageHeader : response.getHeadersList()) {
headers.put(messageHeader.getKey(), messageHeader.getValue());
}
return new FallbackInfo(response.getCode(), headers, response.getBody());
}
public CircuitBreakerRule getCurrentActiveRule() {
return currentActiveRule;
}
@Override
public void closeToOpen(String circuitBreaker) {
synchronized (this) {
if (destroyed.get()) {
LOG.info("counters {} for resource {} is destroyed, closeToOpen skipped", currentActiveRule.getName(), resource);
return;
}
CircuitBreakerStatus circuitBreakerStatus = circuitBreakerStatusReference.get();
if (circuitBreakerStatus.getStatus() == Status.CLOSE) {
toOpen(circuitBreakerStatus, circuitBreaker);
}
}
}
private void toOpen(CircuitBreakerStatus preStatus, String circuitBreaker) {
CircuitBreakerStatus newStatus = new CircuitBreakerStatus(circuitBreaker, Status.OPEN,
System.currentTimeMillis(), fallbackInfo);
circuitBreakerStatusReference.set(newStatus);
CB_EVENT_LOG.info("previous status {}, current status {}, resource {}, rule {}", preStatus.getStatus(),
newStatus.getStatus(), resource, circuitBreaker);
reportCircuitStatus();
int sleepWindow = currentActiveRule.getRecoverCondition().getSleepWindow();
// add callback after timeout
stateChangeExecutors.schedule(new Runnable() {
@Override
public void run() {
openToHalfOpen();
}
}, sleepWindow, TimeUnit.SECONDS);
}
@Override
public void openToHalfOpen() {
synchronized (this) {
if (destroyed.get()) {
LOG.info("counters {} for resource {} is destroyed, openToHalfOpen skipped", currentActiveRule.getName(), resource);
return;
}
CircuitBreakerStatus circuitBreakerStatus = circuitBreakerStatusReference.get();
if (circuitBreakerStatus.getStatus() != Status.OPEN) {
return;
}
int consecutiveSuccess = currentActiveRule.getRecoverCondition().getConsecutiveSuccess();
HalfOpenStatus halfOpenStatus = new HalfOpenStatus(
circuitBreakerStatus.getCircuitBreaker(), System.currentTimeMillis(), consecutiveSuccess);
CB_EVENT_LOG.info("previous status {}, current status {}, resource {}, rule {}",
circuitBreakerStatus.getStatus(),
halfOpenStatus.getStatus(), resource, circuitBreakerStatus.getCircuitBreaker());
circuitBreakerStatusReference.set(halfOpenStatus);
reportCircuitStatus();
}
}
@Override
public void halfOpenToClose() {
synchronized (this) {
if (destroyed.get()) {
LOG.info("counters {} for resource {} is destroyed, halfOpenToClose skipped", currentActiveRule.getName(), resource);
return;
}
CircuitBreakerStatus circuitBreakerStatus = circuitBreakerStatusReference.get();
if (circuitBreakerStatus.getStatus() == Status.HALF_OPEN) {
CircuitBreakerStatus newStatus = new CircuitBreakerStatus(circuitBreakerStatus.getCircuitBreaker(),
Status.CLOSE, System.currentTimeMillis());
circuitBreakerStatusReference.set(newStatus);
CB_EVENT_LOG.info("previous status {}, current status {}, resource {}, rule {}",
circuitBreakerStatus.getStatus(),
newStatus.getStatus(), resource, circuitBreakerStatus.getCircuitBreaker());
for (TriggerCounter triggerCounter : counters) {
triggerCounter.resume();
}
reportCircuitStatus();
}
}
}
@Override
public void halfOpenToOpen() {
synchronized (this) {
if (destroyed.get()) {
LOG.info("counters {} for resource {} is destroyed, halfOpenToOpen skipped", currentActiveRule.getName(), resource);
return;
}
CircuitBreakerStatus circuitBreakerStatus = circuitBreakerStatusReference.get();
if (circuitBreakerStatus.getStatus() == Status.HALF_OPEN) {
toOpen(circuitBreakerStatus, circuitBreakerStatus.getCircuitBreaker());
}
}
}
public RetStatus parseRetStatus(ResourceStat resourceStat) {
List errorConditionsList = currentActiveRule.getErrorConditionsList();
if (CollectionUtils.isEmpty(errorConditionsList)) {
return resourceStat.getRetStatus();
}
for (ErrorCondition errorCondition : errorConditionsList) {
MatchString condition = errorCondition.getCondition();
switch (errorCondition.getInputType()) {
case RET_CODE:
boolean codeMatched = RuleUtils
.matchStringValue(condition, String.valueOf(resourceStat.getRetCode()), regexFunction);
if (codeMatched) {
return RetStatus.RetFail;
}
break;
case DELAY:
String value = condition.getValue().getValue();
int delayValue = Integer.parseInt(value);
if (resourceStat.getDelay() >= delayValue) {
return RetStatus.RetTimeout;
}
break;
default:
break;
}
}
return RetStatus.RetSuccess;
}
public void report(ResourceStat resourceStat) {
RetStatus retStatus = parseRetStatus(resourceStat);
boolean success = retStatus != RetStatus.RetFail && retStatus != RetStatus.RetTimeout;
CircuitBreakerStatus circuitBreakerStatus = circuitBreakerStatusReference.get();
LOG.debug("[CircuitBreaker] report resource stat {}", resourceStat);
if (null != circuitBreakerStatus && circuitBreakerStatus.getStatus() == Status.HALF_OPEN) {
HalfOpenStatus halfOpenStatus = (HalfOpenStatus) circuitBreakerStatus;
boolean checked = halfOpenStatus.report(success);
LOG.debug("[CircuitBreaker] report resource halfOpen stat {}, checked {}", resourceStat.getResource(),
checked);
if (checked) {
Status nextStatus = halfOpenStatus.calNextStatus();
switch (nextStatus) {
case CLOSE:
stateChangeExecutors.execute(new Runnable() {
@Override
public void run() {
halfOpenToClose();
}
});
break;
case OPEN:
stateChangeExecutors.execute(new Runnable() {
@Override
public void run() {
halfOpenToOpen();
}
});
break;
default:
break;
}
}
} else {
LOG.debug("[CircuitBreaker] report resource stat to counter {}", resourceStat.getResource());
for (TriggerCounter counter : counters) {
counter.report(success);
}
}
}
public CircuitBreakerStatus getCircuitBreakerStatus() {
return circuitBreakerStatusReference.get();
}
public void reportCircuitStatus() {
if (Objects.isNull(extensions)) {
return;
}
Collection statPlugins = extensions.getPlugins().getPlugins(PluginTypes.STAT_REPORTER.getBaseType());
if (null != statPlugins) {
try {
for (Plugin statPlugin : statPlugins) {
if (statPlugin instanceof StatReporter) {
DefaultCircuitBreakResult result = new DefaultCircuitBreakResult();
result.setCallerService(resource.getCallerService());
result.setCircuitBreakStatus(getCircuitBreakerStatus());
result.setService(resource.getService().getService());
result.setNamespace(resource.getService().getNamespace());
result.setLevel(resource.getLevel().name());
result.setRuleName(currentActiveRule.getName());
switch (resource.getLevel()) {
case SERVICE:
ServiceResource serviceResource = (ServiceResource) resource;
break;
case METHOD:
MethodResource methodResource = (MethodResource) resource;
result.setMethod(methodResource.getMethod());
break;
case INSTANCE:
InstanceResource instanceResource= (InstanceResource) resource;
result.setHost(instanceResource.getHost());
result.setPort(instanceResource.getPort());
break;
}
StatInfo info = new StatInfo();
info.setCircuitBreakGauge(result);
((StatReporter) statPlugin).reportStat(info);
}
}
} catch (Exception ex) {
LOG.info("circuit breaker report encountered exception, e: {}", ex.getMessage());
}
}
}
public void setDestroyed(boolean value) {
destroyed.set(value);
toDestroy();
}
private void toDestroy() {
synchronized (this) {
CircuitBreakerStatus circuitBreakerStatus = circuitBreakerStatusReference.get();
circuitBreakerStatus.setDestroy(true);
circuitBreakerStatusReference.set(circuitBreakerStatus);
CB_EVENT_LOG.info("previous status {}, current status {}, resource {}, rule {}",
circuitBreakerStatus.getStatus(),
Status.DESTROY, resource, circuitBreakerStatus.getCircuitBreaker());
for (TriggerCounter triggerCounter : counters) {
triggerCounter.resume();
}
reportCircuitStatus();
}
}
}
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