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/*
* Copyright (C) 2015-2019 S.Violet
*
* 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.
*
* Project GitHub: https://github.com/shepherdviolet/slate
* Email: [email protected]
*/
package sviolet.slate.common.helper.sentinel;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeRule;
import com.alibaba.csp.sentinel.slots.block.degrade.DegradeRuleManager;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRule;
import com.alibaba.csp.sentinel.slots.block.flow.FlowRuleManager;
import com.alibaba.csp.sentinel.slots.system.SystemRule;
import com.alibaba.csp.sentinel.slots.system.SystemRuleManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.*;
import static com.alibaba.csp.sentinel.slots.block.RuleConstant.*;
/**
* 说明文档见: https://github.com/shepherdviolet/slate/blob/master/docs/ezsentinel/guide.md
*
* Sentinel官方最佳实践的方案中, 应该是改造Dashboard, 由Dashboard向一个数据源推送规则, 而客户端则连接数据源获取更新.
* 而EzSentinel是一个简易的变通方案, 不改造Dashboard, 也不配置客户端数据源. 通过一个大JSON来维护规则(人工), 然后手动
* 将这个JSON配置到Apollo配置中心, 借助Apollo准实时将配置用setter方法注入的特性, 在setter方法中显式地调用Sentinel的
* API来实现规则配置. 而Dashboard仅用于观察(不做配置).
*
* 通过EzSentinel配置规则后, 可以在Dashboard的流控规则中看到_ez_开头的资源, 这个是用来观察某个应用规则是否生效/何时生效/
* 失败原因的.
*
* @param 规则数据类型
* @author S.Violet
*/
public abstract class AbstractEzSentinelRuleConfigurer implements EzSentinelRuleConfigurer {
private static final DateTimeFormatter TIME_FORMATTER = DateTimeFormatter.ofPattern("yyyyMMdd-HHmmss");
private static final String RULE_VERSION = "_ez_rule_version=";
private static final String UPDATE_TIME = "_ez_rule_update_time=";
private static final String ERROR_MESSAGE = "_ez_error_msg=";
private final Logger logger = LoggerFactory.getLogger(getClass());
/**
* 在Apollo配置变化时, setter方法中调用该方法更新规则, 参考{@link EnableEzSentinel}
*
* @param ruleData 规则数据
*/
public void update(T ruleData) {
logger.info("EzSentinel | Update sentinel rule start");
//convert
Rules rules = null;
if (ruleData != null) {
try {
rules = convertRuleData(ruleData);
} catch (Exception e) {
handleException("illegal_rule_data", e, ruleData);
return;
}
}
//update
updateRules(rules);
logger.info("EzSentinel | Update sentinel rule finish");
}
protected abstract Rules convertRuleData(T ruleData);
protected void updateRules(Rules rules) {
if (rules == null) {
SystemRuleManager.loadRules(Collections.emptyList());
DegradeRuleManager.loadRules(Collections.emptyList());
FlowRuleManager.loadRules(Collections.emptyList());
logger.info("EzSentinel | No sentinel rules (It will clear all previous rules!)");
return;
}
//System rules
if (rules.systemRule != null) {
SystemRuleManager.loadRules(Collections.singletonList(rules.systemRule.build()));
logger.info("EzSentinel | System rule updated, 1 rules");
} else {
SystemRuleManager.loadRules(Collections.emptyList());
logger.info("EzSentinel | System rule updated, 0 rules");
}
//Degrade / Flow rules
List degradeRules = new LinkedList<>();
List flowRules = new LinkedList<>();
if (rules.getResourceRules() != null && rules.getResourceRules().size() > 0) {
Map ruleGroups = rules.getRuleGroups();
if (ruleGroups == null) {
handleException("missing_rule_groups", new Exception("Missing 'ruleGroups' in the rule data"), null);
return;
}
for (Map.Entry entry : rules.getResourceRules().entrySet()) {
//Entry -> key: resourceName value: ruleGroupId
String resource = entry.getKey();
String ruleGroupId = entry.getValue();
RuleGroup ruleGroup = ruleGroups.get(ruleGroupId);
if (ruleGroup == null) {
handleException("undefined_rule_group", new Exception("Undefined rule group '" + ruleGroupId +
"' in ruleGroups, required by resource '" + resource + "'"), null);
return;
}
if (logger.isDebugEnabled()) {
logger.debug("EzSentinel | Resource '" + resource + "' -> ruleGroup '" + ruleGroupId + "'");
}
//Degrade rules
if (ruleGroup.getDegradeRules() != null) {
for (DegradeRuleBuilder degradeRuleBuilder : ruleGroup.getDegradeRules()) {
degradeRules.add(degradeRuleBuilder.build(resource));
if (logger.isDebugEnabled()) {
logger.debug("EzSentinel | Resource '" + resource + "' -> " + degradeRuleBuilder);
}
}
}
//Flow rules
if (ruleGroup.getFlowRules() != null) {
for (FlowRuleBuilder flowRuleBuilder : ruleGroup.getFlowRules()) {
flowRules.add(flowRuleBuilder.build(resource));
if (logger.isDebugEnabled()) {
logger.debug("EzSentinel | Resource '" + resource + "' -> " + flowRuleBuilder);
}
}
}
}
}
//comment
flowRules.add(commentRule(UPDATE_TIME + TIME_FORMATTER.format(LocalDateTime.now())));
flowRules.add(commentRule(RULE_VERSION + rules.getRuleVersion()));
//load
DegradeRuleManager.loadRules(degradeRules);
FlowRuleManager.loadRules(flowRules);
logger.info("EzSentinel | Degrade rule updated, " + degradeRules.size() + " rules");
logger.info("EzSentinel | Flow rule updated, " + flowRules.size() + " rules");
}
protected void handleException(String errorCode, Exception e, T ruleData){
if (e != null) {
logger.error("EzSentinel | Error while updating sentinel rules, " + errorCode + ", " + TIME_FORMATTER.format(LocalDateTime.now()), e);
} else {
logger.error("EzSentinel | Error while updating sentinel rules, " + errorCode + ", " + TIME_FORMATTER.format(LocalDateTime.now()));
}
if (ruleData != null) {
logger.error("EzSentinel | Rule data:" + ruleData);
}
List flowRules = FlowRuleManager.getRules();
flowRules.add(commentRule(ERROR_MESSAGE + errorCode + "_" + TIME_FORMATTER.format(LocalDateTime.now())));
FlowRuleManager.loadRules(flowRules);
}
// Utils /////////////////////////////////////////////////////////////////////////////////////////////
protected static int nullable(Integer value, int fallback){
if (value == null) {
return fallback;
}
return value;
}
protected static FlowRule commentRule(String comment){
FlowRule flowRule = new FlowRule(comment);
flowRule.setCount(0);
return flowRule;
}
// Classes /////////////////////////////////////////////////////////////////////////////////////////////
public static class Rules {
private Map ruleGroups;
private SystemRuleBuilder systemRule;
private Map resourceRules;
private String ruleVersion;
public Map getRuleGroups() {
return ruleGroups;
}
public void setRuleGroups(Map ruleGroups) {
this.ruleGroups = ruleGroups;
}
public SystemRuleBuilder getSystemRule() {
return systemRule;
}
public void setSystemRule(SystemRuleBuilder systemRule) {
this.systemRule = systemRule;
}
public Map getResourceRules() {
return resourceRules;
}
public void setResourceRules(Map resourceRules) {
this.resourceRules = resourceRules;
}
public String getRuleVersion() {
return ruleVersion;
}
public void setRuleVersion(String ruleVersion) {
this.ruleVersion = ruleVersion;
}
}
public static class RuleGroup {
private List flowRules;
private List degradeRules;
public List getFlowRules() {
return flowRules;
}
public void setFlowRules(List flowRules) {
this.flowRules = flowRules;
}
public List getDegradeRules() {
return degradeRules;
}
public void setDegradeRules(List degradeRules) {
this.degradeRules = degradeRules;
}
}
public static class FlowRuleBuilder {
private double count;
private String grade = "THREAD";
private String limitApp = "default";
private String strategy = "DIRECT";
private String controlBehavior = "DEFAULT";
public double getCount() {
return count;
}
public void setCount(double count) {
this.count = count;
}
public String getGrade() {
return grade;
}
public void setGrade(String grade) {
this.grade = grade;
}
public String getLimitApp() {
return limitApp;
}
public void setLimitApp(String limitApp) {
this.limitApp = limitApp;
}
public String getStrategy() {
return strategy;
}
public void setStrategy(String strategy) {
this.strategy = strategy;
}
public String getControlBehavior() {
return controlBehavior;
}
public void setControlBehavior(String controlBehavior) {
this.controlBehavior = controlBehavior;
}
private static final Map FLOW_GRADE_MAP = new HashMap(){{
put("THREAD", FLOW_GRADE_THREAD);
put("QPS", FLOW_GRADE_QPS);
}};
private static final Map STRATEGY_MAP = new HashMap(){{
put("DIRECT", STRATEGY_DIRECT);
put("RELATE", STRATEGY_RELATE);
put("CHAIN", STRATEGY_CHAIN);
}};
private static final Map CONTROL_BEHAVIOR_MAP = new HashMap(){{
put("DEFAULT", CONTROL_BEHAVIOR_DEFAULT);
put("WARM_UP", CONTROL_BEHAVIOR_WARM_UP);
put("RATE_LIMITER", CONTROL_BEHAVIOR_RATE_LIMITER);
put("WARM_UP_RATE_LIMITER", CONTROL_BEHAVIOR_WARM_UP_RATE_LIMITER);
}};
protected FlowRule build(String resource){
FlowRule flowRule = new FlowRule(resource);
flowRule.setCount(getCount());
flowRule.setGrade(nullable(FLOW_GRADE_MAP.get(getGrade()), FLOW_GRADE_THREAD));
flowRule.setLimitApp(getLimitApp());
flowRule.setStrategy(nullable(STRATEGY_MAP.get(getStrategy()), STRATEGY_DIRECT));
flowRule.setControlBehavior(nullable(CONTROL_BEHAVIOR_MAP.get(getControlBehavior()), CONTROL_BEHAVIOR_DEFAULT));
return flowRule;
}
@Override
public String toString() {
return "FlowRule{" +
"count=" + count +
", grade='" + grade + '\'' +
", limitApp='" + limitApp + '\'' +
", strategy='" + strategy + '\'' +
", controlBehavior='" + controlBehavior + '\'' +
'}';
}
}
public static class DegradeRuleBuilder {
private double count;
private int timeWindow;//s
private String grade = "RT";
private String limitApp = "default";
public double getCount() {
return count;
}
public void setCount(double count) {
this.count = count;
}
public String getGrade() {
return grade;
}
public void setGrade(String grade) {
this.grade = grade;
}
public int getTimeWindow() {
return timeWindow;
}
public void setTimeWindow(int timeWindow) {
this.timeWindow = timeWindow;
}
public String getLimitApp() {
return limitApp;
}
public void setLimitApp(String limitApp) {
this.limitApp = limitApp;
}
private static final Map DEGRADE_GRADE_MAP = new HashMap(){{
put("RT", DEGRADE_GRADE_RT);
put("EXCEPTION_RATIO", DEGRADE_GRADE_EXCEPTION_RATIO);
put("EXCEPTION_COUNT", DEGRADE_GRADE_EXCEPTION_COUNT);
}};
protected DegradeRule build(String resource){
DegradeRule degradeRule = new DegradeRule(resource);
degradeRule.setCount(getCount());
degradeRule.setGrade(nullable(DEGRADE_GRADE_MAP.get(getGrade()), DEGRADE_GRADE_RT));
degradeRule.setTimeWindow(getTimeWindow());
degradeRule.setLimitApp(getLimitApp());
return degradeRule;
}
@Override
public String toString() {
return "DegradeRule{" +
"count=" + count +
", timeWindow=" + timeWindow +
", grade='" + grade + '\'' +
", limitApp='" + limitApp + '\'' +
'}';
}
}
public static class SystemRuleBuilder {
private int highestSystemLoad = -1;//-1 disable
private int avgRt = -1;//-1 disable
private int maxThread = -1;//-1 disable
private int qps = -1;//-1 disable
public int getHighestSystemLoad() {
return highestSystemLoad;
}
public void setHighestSystemLoad(int highestSystemLoad) {
this.highestSystemLoad = highestSystemLoad;
}
public int getAvgRt() {
return avgRt;
}
public void setAvgRt(int avgRt) {
this.avgRt = avgRt;
}
public int getMaxThread() {
return maxThread;
}
public void setMaxThread(int maxThread) {
this.maxThread = maxThread;
}
public int getQps() {
return qps;
}
public void setQps(int qps) {
this.qps = qps;
}
protected SystemRule build(){
SystemRule systemRule = new SystemRule();
systemRule.setHighestSystemLoad(getHighestSystemLoad());
systemRule.setAvgRt(getAvgRt());
systemRule.setMaxThread(getMaxThread());
systemRule.setQps(getQps());
return systemRule;
}
}
}