现象

修改了nacos配置，重新发布
过了一段时间发现，数据库偶尔会连接失败报异常

less 复制代码

- create connection SQLException, url: jdbc:mysql://*******:3306/settlement?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&useSSL=false&zeroDateTimeBehavior=convertToNull&serverTimezone=Asia/Shanghai, errorCode 1045, state 28000java.sql.SQLException: Access denied for user '****'@'ip' (using password: YES)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:836)
	at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:456)
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246)
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:199)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:156)
	at com.alibaba.druid.filter.FilterAdapter.connection_connect(FilterAdapter.java:787)
	at com.alibaba.druid.filter.FilterEventAdapter.connection_connect(FilterEventAdapter.java:38)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150)
	at com.alibaba.druid.filter.stat.StatFilter.connection_connect(StatFilter.java:218)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150)
	at com.alibaba.druid.filter.FilterAdapter.connection_connect(FilterAdapter.java:787)
	at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:150)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1646)
	at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1710)
	at com.alibaba.druid.pool.DruidDataSource$CreateConnectionThread.run(DruidDataSource.java:2753)

环境

mysql 5.7.28-log
maven pom.xml

xml 复制代码

<dependency>
    <groupId>com.github.ulisesbocchio</groupId>
    <artifactId>jasypt-spring-boot-starter</artifactId>
    <version>2.1.2</version>
</dependency>

 <dependency>
        <groupId>com.alibaba.cloud</groupId>
        <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        <version>2.2.0.RELEASE</version>
 </dependency>    

<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid-spring-boot-starter</artifactId>
      <version>1.1.21</version>
</dependency>

bootstrap.yml 配置

yaml 复制代码

spring:
  application:
    name: test
  cloud:
    nacos:
      serveraddr: ***
      namespace: loc
      config:
        server-addr: ${spring.cloud.nacos.serveraddr}
        namespace: ${spring.cloud.nacos.namespace}
        prefix: ${spring.application.name}
        file-extension: yml
      discovery:
        server-addr: ${spring.cloud.nacos.serveraddr}
        namespace: ${spring.cloud.nacos.namespace}

nacos配置 test.yml

yaml 复制代码

jasypt:
  encryptor:
    password: hello

分析

发布nacos配置会导致配置刷新吗？

如下代码可以清楚看到和bootstrap.yml对应的NacosConfigProperties ，默认是开启刷新的。

com.alibaba.cloud.nacos.NacosConfigProperties

arduino 复制代码

	/**
	 * the master switch for refresh configuration, it default opened(true).
	 */
	private boolean refreshEnabled = true;

数据库为啥连接失败？

启动时数据库创建是成功的，为啥现在偶尔失败。

打个断点看一看

com.alibaba.druid.pool.DruidAbstractDataSource#createPhysicalConnection()

ini 复制代码

       // 断点
        String password = getPassword();
        PasswordCallback passwordCallback = getPasswordCallback();

断点处发现密码变成了 ENC()加密数据，密码根本未解密才导致连接失败。

什么时候密码被变成未解密的了？

修改nacos上的配置，重新发布 com.alibaba.druid.pool.DruidAbstractDataSource#setPassword 打个断点看一看

typescript 复制代码

    public void setPassword(String password) {
     // 断点
        if (StringUtils.equals(this.password, password)) {
            return;
        }

        if (inited) {
            LOG.info("password changed");
        }

        this.password = password;
    }

堆栈如下，收到NacosContextRefresher事件后，动态刷新触发了密码的修改

vbnet 复制代码

setPassword:1134, DruidAbstractDataSource (com.alibaba.druid.pool)
invoke:-1, GeneratedMethodAccessor502 (sun.reflect)
invoke:43, DelegatingMethodAccessorImpl (sun.reflect)
invoke:498, Method (java.lang.reflect)
setValue:346, JavaBeanBinder$BeanProperty (org.springframework.boot.context.properties.bind)
bind:96, JavaBeanBinder (org.springframework.boot.context.properties.bind)
bind:79, JavaBeanBinder (org.springframework.boot.context.properties.bind)
bind:56, JavaBeanBinder (org.springframework.boot.context.properties.bind)
lambda$bindDataObject$5:452, Binder (org.springframework.boot.context.properties.bind)
get:-1, 540325452 (org.springframework.boot.context.properties.bind.Binder$$Lambda$42)
withIncreasedDepth:570, Binder$Context (org.springframework.boot.context.properties.bind)
withDataObject:556, Binder$Context (org.springframework.boot.context.properties.bind)
access$400:513, Binder$Context (org.springframework.boot.context.properties.bind)
bindDataObject:450, Binder (org.springframework.boot.context.properties.bind)
bindObject:391, Binder (org.springframework.boot.context.properties.bind)
bind:320, Binder (org.springframework.boot.context.properties.bind)
bind:308, Binder (org.springframework.boot.context.properties.bind)
bind:238, Binder (org.springframework.boot.context.properties.bind)
bind:225, Binder (org.springframework.boot.context.properties.bind)
bind:89, ConfigurationPropertiesBinder (org.springframework.boot.context.properties)
bind:107, ConfigurationPropertiesBindingPostProcessor (org.springframework.boot.context.properties)
postProcessBeforeInitialization:96, ConfigurationPropertiesBindingPostProcessor (org.springframework.boot.context.properties)
applyBeanPostProcessorsBeforeInitialization:416, AbstractAutowireCapableBeanFactory (org.springframework.beans.factory.support)
initializeBean:1795, AbstractAutowireCapableBeanFactory (org.springframework.beans.factory.support)
initializeBean:407, AbstractAutowireCapableBeanFactory (org.springframework.beans.factory.support)
rebind:108, ConfigurationPropertiesRebinder (org.springframework.cloud.context.properties)
rebind:84, ConfigurationPropertiesRebinder (org.springframework.cloud.context.properties)
onApplicationEvent:142, ConfigurationPropertiesRebinder (org.springframework.cloud.context.properties)
onApplicationEvent:51, ConfigurationPropertiesRebinder (org.springframework.cloud.context.properties)
doInvokeListener:172, SimpleApplicationEventMulticaster (org.springframework.context.event)
invokeListener:165, SimpleApplicationEventMulticaster (org.springframework.context.event)
multicastEvent:139, SimpleApplicationEventMulticaster (org.springframework.context.event)
publishEvent:403, AbstractApplicationContext (org.springframework.context.support)
publishEvent:360, AbstractApplicationContext (org.springframework.context.support)
refreshEnvironment:96, ContextRefresher (org.springframework.cloud.context.refresh)
refresh:85, ContextRefresher (org.springframework.cloud.context.refresh)
handle:72, RefreshEventListener (org.springframework.cloud.endpoint.event)
onApplicationEvent:61, RefreshEventListener (org.springframework.cloud.endpoint.event)
doInvokeListener:172, SimpleApplicationEventMulticaster (org.springframework.context.event)
invokeListener:165, SimpleApplicationEventMulticaster (org.springframework.context.event)
multicastEvent:139, SimpleApplicationEventMulticaster (org.springframework.context.event)
publishEvent:403, AbstractApplicationContext (org.springframework.context.support)
publishEvent:360, AbstractApplicationContext (org.springframework.context.support)
innerReceive:133, NacosContextRefresher$1 (com.alibaba.cloud.nacos.refresh)
receiveConfigInfo:38, AbstractSharedListener (com.alibaba.nacos.api.config.listener)
run:203, CacheData$1 (com.alibaba.nacos.client.config.impl)
safeNotifyListener:233, CacheData (com.alibaba.nacos.client.config.impl)
checkListenerMd5:174, CacheData (com.alibaba.nacos.client.config.impl)
run:552, ClientWorker$LongPollingRunnable (com.alibaba.nacos.client.config.impl)
call:511, Executors$RunnableAdapter (java.util.concurrent)
run$$$capture:266, FutureTask (java.util.concurrent)
run:-1, FutureTask (java.util.concurrent)

如何解决？

1. 不刷新

bootstrap.yml 配置 spring.cloud.nacos.config.refreshEnabled 为false

yaml 复制代码

spring:
  application:
    name: test
  cloud:
    nacos:
      serveraddr: ***
      namespace: loc
      config:
        server-addr: ${spring.cloud.nacos.serveraddr}
        namespace: ${spring.cloud.nacos.namespace}
        prefix: ${spring.application.name}
        file-extension: yml
        refreshEnabled: false
      discovery:
        server-addr: ${spring.cloud.nacos.serveraddr}
        namespace: ${spring.cloud.nacos.namespace}

2. 让获取的property是解密后。

梳理一下事件和动作点

时刻	动作
T1	我们点击发布新的nacos配置
T2	触发ContextRefresh，更新本地的属性
T3	连接池重新连接数据库

复现

在T1，T2时间之间，我kill掉了当前的connection。

因为是连接池，可能原来connection继续使用，这样无法看到报错，我需要kill掉之前的connection。

为了方便kill，我将druid初始化连接数，最小连接数都改为1。

mysql kill connection

dart 复制代码

// 查看当前connection
show processlist;
// 杀掉当前连接
kill pid;

refresh() 刷新

org.springframework.cloud.context.refresh.ContextRefresher

typescript 复制代码

public synchronized Set<String> refresh() {
   Set<String> keys = refreshEnvironment();
   this.scope.refreshAll();
   return keys;
}

public synchronized Set<String> refreshEnvironment() {
   Map<String, Object> before = extract(
         this.context.getEnvironment().getPropertySources());
   addConfigFilesToEnvironment();
   // 哪些属性修改了，哪些Bean需要重新创建
   Set<String> keys = changes(before,
         extract(this.context.getEnvironment().getPropertySources())).keySet();
   this.context.publishEvent(new EnvironmentChangeEvent(this.context, keys));
   return keys;
}

debug看一下,可以看到是加密的PropertySource

在调用 addConfigFilesToEnvironment 之后，可以看到此时是不加密的PropertySource了。

nacos Property 如何刷新

com.alibaba.cloud.nacos.client.NacosPropertySourceLocator#loadNacosDataIfPresent

arduino 复制代码

private void loadNacosDataIfPresent(final CompositePropertySource composite,
      final String dataId, final String group, String fileExtension,
      boolean isRefreshable) {
   if (null == dataId || dataId.trim().length() < 1) {
      return;
   }
   if (null == group || group.trim().length() < 1) {
      return;
   }
   NacosPropertySource propertySource = this.loadNacosPropertySource(dataId, group,
         fileExtension, isRefreshable);
   this.addFirstPropertySource(composite, propertySource, false);
}

可以从图上看到核心的问题是NacosPropertySource没有被 EncryptableEnumerablePropertySourceWrapper 装饰，导致了获取到属性是未加密的。

可以从 org.springframework.cloud.context.refresh.ContextRefresher 看到触发了 EnvironmentChangeEvent 事件，所以解决方法是我们先处理EnvironmentChangeEvent事件，将NacosPropertySource装饰为EncryptableEnumerablePropertySourceWrapper

官方解决方案

jasypt-spring-boot-parent-3.0.3

1. 升级版本到v3.0.3

xml 复制代码

<dependency> 
    <groupId>com.github.ulisesbocchio</groupId> 
    <artifactId>jasypt-spring-boot-starter</artifactId> 
    <version>3.0.3<version> 
</dependency>

2. nacos test.yml 新增配置

yml 复制代码

jasypt:
  encryptor:
    password: hello
    # 新增配置
    algorithm: PBEWithMD5AndDES
    iv-generator-classname: org.jasypt.iv.NoIvGenerator

源码解析

我拉了v3.0.3和v3.0.3对比，

RefreshScopeRefreshedEventListener 是一个处理ApplicationEvent的Listener，

v3.0.3 新增了对 org.springframework.cloud.context.environment.EnvironmentChangeEvent的处理

V3.0.3 RefreshScopeRefreshedEventListener 代码如下

java 复制代码

package com.ulisesbocchio.jasyptspringboot.caching;

import com.ulisesbocchio.jasyptspringboot.EncryptablePropertySource;
import com.ulisesbocchio.jasyptspringboot.EncryptablePropertySourceConverter;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.springframework.context.ApplicationEvent;
import org.springframework.context.ApplicationListener;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
import org.springframework.core.env.*;
import org.springframework.util.ClassUtils;

@Order(Ordered.HIGHEST_PRECEDENCE)
@Slf4j
public class RefreshScopeRefreshedEventListener implements ApplicationListener<ApplicationEvent> {

    public static final String REFRESHED_EVENT_CLASS = "org.springframework.cloud.context.scope.refresh.RefreshScopeRefreshedEvent";
    public static final String ENVIRONMENT_EVENT_CLASS = "org.springframework.cloud.context.environment.EnvironmentChangeEvent";
    private final ConfigurableEnvironment environment;
    private final EncryptablePropertySourceConverter converter;

    public RefreshScopeRefreshedEventListener(ConfigurableEnvironment environment, EncryptablePropertySourceConverter converter) {
        this.environment = environment;
        this.converter = converter;
    }

    @Override
    @SneakyThrows
    public void onApplicationEvent(ApplicationEvent event) {
        if (isAssignable(ENVIRONMENT_EVENT_CLASS, event) || isAssignable(REFRESHED_EVENT_CLASS, event)) {
            log.info("Refreshing cached encryptable property sources");
            refreshCachedProperties();
            decorateNewSources();
        }
    }

    private void decorateNewSources() {
        // 将新的PropertySource转为EncryptablePropertySource

        MutablePropertySources propSources = environment.getPropertySources();
        converter.convertPropertySources(propSources);
    }

    boolean isAssignable(String className, Object value) {
        try {
            return ClassUtils.isAssignableValue(ClassUtils.forName(className, null), value);
        } catch (ClassNotFoundException e) {
            return false;
        }
    }

    private void refreshCachedProperties() {
        PropertySources propertySources = environment.getPropertySources();
        propertySources.forEach(this::refreshPropertySource);
    }

    @SuppressWarnings("rawtypes")
    private void refreshPropertySource(PropertySource<?> propertySource) {
        if (propertySource instanceof CompositePropertySource) {
            CompositePropertySource cps = (CompositePropertySource) propertySource;
            cps.getPropertySources().forEach(this::refreshPropertySource);
        } else if (propertySource instanceof EncryptablePropertySource) {
            EncryptablePropertySource eps = (EncryptablePropertySource) propertySource;
            eps.refresh();
        }
    }
}

参考资料

jasypt-spring-boot-parent-3.0.3

spring cloud + nacos 配置刷新 jasypt 未解密 数据库连接失败1045

现象

环境

分析

发布nacos配置会导致配置刷新吗？

数据库为啥连接失败？

什么时候密码被变成未解密的了？

如何解决？

1. 不刷新

2. 让获取的property是解密后。

复现

refresh() 刷新

nacos Property 如何刷新

官方解决方案

1. 升级版本到v3.0.3

2. nacos test.yml 新增配置

源码解析

参考资料

spring cloud + nacos 配置刷新 jasypt 未解密数据库连接失败1045