SkyWalking 自定义插件
Gonk 人气:3SkyWalking 自定义插件(Spring RabbitMQ) 官方
RabbitMQ插件问题
skywalking官方提供的RabbitMQ插件存在缺陷,其只针对RabbitMQ官方原生Client实现扩展,但我们在项目中一般不直接使用原生Client,而是使用Spring RabitMQ Client,因Spring RabitMQ Consumer中存在跨线程操作,导致跟踪ID断链。
具体分析过程
1.官方插件源码的拦截点是原生Consumer的handleDelivery方法,源码如下:
2.而Spring RabbitMQ消费者的默认实现是BlockingQueueConsumer, handleDelivery核心逻辑是把消息放到内部的BlockingQueue队列,不做真正的消费处理,因此拦截此处无法关联到消费者逻辑,源码如下
@Override public void handleDelivery(String consumerTag, Envelope envelope, AMQP.BasicProperties properties, byte[] body) { ... try { if (BlockingQueueConsumer.this.abortStarted > 0) { if (!BlockingQueueConsumer.this.queue.offer( new Delivery(consumerTag, envelope, properties, body, this.queueName), BlockingQueueConsumer.this.shutdownTimeout, TimeUnit.MILLISECONDS)) { Channel channelToClose = super.getChannel(); RabbitUtils.setPhysicalCloseRequired(channelToClose, true); // Defensive - should never happen BlockingQueueConsumer.this.queue.clear(); if (!this.canceled) { RabbitUtils.cancel(channelToClose, consumerTag); } try { channelToClose.close(); catch (@SuppressWarnings("unused") TimeoutException e) { // no-op } } else { BlockingQueueConsumer.this.queue .put(new Delivery(consumerTag, envelope, properties, body, this.queueName)); } catch (@SuppressWarnings("unused") InterruptedException e) { Thread.currentThread().interrupt(); catch (Exception e) { BlockingQueueConsumer.logger.warn("Unexpected exception during delivery", e); }
3.真正的消费处理在SimpleMessageListenerContainer,SimpleMessageListenerContainer继承Runnable接口,在其run方法中while循环调用mainLoop方法,整体调用链路为
4.SimpleMessageListenerContainer.run() -> SimpleMessageListenerContainer.mainLoop() -> SimpleMessageListenerContainer.receiveAndExecute() -> SimpleMessageListenerContainer.doReceiveAndExecute() -> AbstractMessageListenerContainer.executeListener()。最终在executeListener中执行消费逻辑
protected void executeListener(Channel channel, Object data) { ... try { // 执行消费逻辑 doExecuteListener(channel, data); if (sample != null) { this.micrometerHolder.success(sample, data instanceof Message ? ((Message) data).getMessageProperties().getConsumerQueue() : queuesAsListString()); } } catch (RuntimeException ex) { .... } }
实现自定义插件
从上面可以分析出,AbstractMessageListenerContainer.executeListener()是最佳的拦截点
实现源码已放到码云仓库:https://gitee.com/eureka-gitee/apm-sniffer-pro/tree/v7.0.0.0/
效果展示
SkyWalking调用链路
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