Docker化服务未接收Orion Context Broker通知的问题排查

我搞不懂为什么Orion明明显示已成功发送TrafficFlowObserved实体更新，但我的Docker化服务就是收不到消息。按预期应该出现以下两种情况之一：

• 若无法连接服务（如URL错误），Orion应打印错误信息；
• 我的服务处理请求并将负载打印至控制台。
  但这两种情况均未发生。

Orion 日志 #

2023-01-18 14:16:50 time=Wednesday 18 Jan 13:16:50 2023.790Z | lvl=TMP | corr=N/A | trans=1674046401-299-00000017019 | from=pending | srv=pending | subsrv=pending | comp=Orion | op=httpRequestSend.cpp[564]:httpRequestSendWithCurl | msg=Sending message 16973 to HTTP server: sending message of 994 bytes to HTTP server
2023-01-18 14:16:50 time=Wednesday 18 Jan 13:16:50 2023.792Z | lvl=INFO | corr=N/A | trans=1674046401-299-00000017019 | from=pending | srv=pending | subsrv=pending | comp=Orion | op=httpRequestSend.cpp[587]:httpRequestSendWithCurl | msg=Notification Successfully Sent to http://smart-vertical:9090/subscription/traffic-flow/observation?subscriptionId=urn:ngsi-ld:Subscription:59c301f4-972f-11ed-809c-0242ac190006

接收通知的Quarkus资源代码 #

@Path("/subscription/traffic-flow")
public class TrafficFlowResource {
    @POST
    @Path("/observation")
    @Consumes(MediaType.APPLICATION_JSON)
    public void measurement(@QueryParam("subscriptionId") String id, Payload payload) {
        logger.info(payload);
    }
}

Orion订阅配置 #

curl -L -X POST 'http://localhost:1026/ngsi-ld/v1/subscriptions/' \
    -H 'Content-Type: application/ld+json' \
    -H 'NGSILD-Tenant: openiot' \
    --data-raw '{
      "description": "Notify me of all traffic flow observation changes",
      "type": "Subscription",
      "entities": [{"type": "TrafficFlowObserved"}],
      "watchedAttributes": [
            "averageVehicleSpeed",
            "intensity",
            "occupancy",
            "levelOfService",
            "roadLoad",
            "saturationFlow"
      ],
      "notification": {
        "format": "keyValues",
        "endpoint": {
          "uri": "http://smart-vertical:9090/subscription/traffic-flow/observation",
          "accept": "application/json"
        }
      },
       "@context": "http://ld-context:80/ngsi-context.jsonld"
    }'

服务的Docker Compose配置 #

smart-vertical:
    build:
        context: ./smart-vertical
        dockerfile: src/main/docker/Dockerfile.jvm
    restart: on-failure
    depends_on:
      - orion
    expose:
      - "9090"
    ports:
      - "9090:9090"
    environment:
      - CB_HOST=orion
      - CB_PORT=1026
      - SMART_VERTICAL_PORT=9090
      - SMART_VERTICAL_HOST=http://smart-vertical:9090/subscription
      - NGSI_CONTEXT_URL=http://ld-context:80/ngsi-context.jsonld

排查过程与疑问 #

Orion与所有服务位于Docker自动创建的同一网络中，我怀疑是IP问题，但没有错误信息无法确认。

我尝试过修改订阅中的IP，将smart-vertical替换为localhost、Docker分配的172.30.0.8、0.0.0.0，但情况更糟，出现以下错误日志：

2023-01-18 14:55:44 time=Wednesday 18 Jan 13:55:44 2023.079Z | lvl=ERROR | corr=N/A | trans=1674050062-123-00000000379 | from=pending | srv=pending | subsrv=pending | comp=Orion | op=httpRequestSend.cpp[573]:httpRequestSendWithCurl | msg=curl_easy_perform failed: 7

或

2023-01-18 15:07:43 time=Wednesday 18 Jan 14:07:43 2023.747Z | lvl=ERROR | corr=N/A | trans=1674050827-980-00000000194 | from=pending | srv=pending | subsrv=pending | comp=Orion | op=httpRequestSend.cpp[573]:httpRequestSendWithCurl | msg=curl_easy_perform failed: 28

从Orion的实现代码中得知：

• 错误码7代表消息过大；
• 错误码28对应无效IP+无法初始化libcurl（仅当未提供实际curl作为第一个参数时可能发生）。

Quarkus使用Vertx，默认情况下Vertx使用自身DNS，这会不会是问题所在？但我不理解为何使用配置SMART_VERTICAL_HOST=http://smart-vertical:9090/subscription时没有IP问题，却仍无法接收消息。

内容的提问来源于stack exchange，提问作者Francesco Vignola