Orion Context Broker中QuantumLeap订阅创建后无法查询求助

问题情况 #

执行POST请求创建QuantumLeap订阅后，收到HTTP 201 Created响应，Orion服务日志也明确记录订阅已创建，但使用GET请求查询订阅时返回空数组。

相关请求与日志 #

创建订阅的请求命令

curl -iX POST 'http://localhost:1026/v2/subscriptions/' \
  -H 'Content-Type: application/json' \
  -H 'Fiware-Service: myClassRoom' \
  -H 'Fiware-ServicePath: /' \
  -d '{
  "description": "Notify QuantumLeap when the temperature changes",
  "subject": {
    "entities": [{ "idPattern": "SensTemp.*"}],
    "condition": {
      "attrs": [ "temperature"]
    }
  },
  "notification": {
    "http": {
      "url": "http://quantum-leap:8668/v2/notify"
    },
    "attrs": ["temperature"],
    "metadata": ["dateCreated", "dateModified"]
  },
  "expires": "2025-02-03T08:00:00.00Z",
  "throttling": 5
}'

创建响应

HTTP/1.1 201 Created
Connection: Keep-Alive
Content-Length: 0
Location: /v2/subscriptions/62e3a39b8aa7c71c4b3e6c05
Fiware-Correlator: 0b597668-0f1e-11ed-b343-0242ac120005
Date: Fri, 29 Jul 2022 09:08:43 GMT

原查询订阅的请求命令（存在错误）

curl -X GET   --url 'http://localhost:1026/v2/subscriptions/

Orion服务日志

srdjan-orion-1 | time=2022-07-29T09:18:31.342Z | lvl=INFO | corr=69e57bcc-0f1f-11ed-abf0-0242ac120005 | trans=1659082790-602-00000000170 | from=172.18.0.1 | srv=myclassroom | subsrv=/ | comp=Orion | op=logTracing.cpp[148]:logInfoRequestWithPayload | msg=Request received: POST /v2/subscriptions/, request payload (377 bytes): { "description": "Notify QuantumLeap when the temperature changes", "subject": { "entities": [ { "idPattern": "SensTemp" } ], "condition": { "attrs": [ "temperature" ] } }, "notification": { "http": { "url": "http://quantum-leap:8668/v2/notify" }, "attrs": [ "temperature" ], "metadata": ["dateCreated", "dateModified"] },"expires": "2025-02-03T08:00:00.00Z", "throttling": 5 }, response code: 201

问题原因及解决方案 #

1. 查询请求缺少Fiware上下文头部 #

Orion的订阅与Fiware-Service和Fiware-ServicePath强绑定，创建时指定了这两个头部，查询时必须携带相同的头部才能访问对应上下文的订阅。原查询命令未携带这些头部，默认会查询空服务上下文，自然无法找到已创建的订阅。

2. 查询命令URL格式错误 #

原查询命令的URL未闭合单引号，且路径末尾多余斜杠，导致请求本身存在语法错误。

正确的查询命令 #

查询所有订阅

curl -X GET 'http://localhost:1026/v2/subscriptions' \
  -H 'Fiware-Service: myClassRoom' \
  -H 'Fiware-ServicePath: /'

根据订阅ID查询单个订阅（使用创建响应中Location头的ID）

curl -X GET 'http://localhost:1026/v2/subscriptions/62e3a39b8aa7c71c4b3e6c05' \
  -H 'Fiware-Service: myClassRoom' \
  -H 'Fiware-ServicePath: /'

额外检查点 #

• 注意Fiware-Service的大小写：Orion日志中记录的srv=myclassroom为全小写，虽然Orion对服务名大小写不敏感，但查询时保持与创建请求一致可避免潜在问题。
• 可直接查看Orion绑定的MongoDB数据库，检查csubs集合中是否存在对应服务的订阅文档，确认订阅确实已持久化。

内容的提问来源于stack exchange，提问作者Srdjan Zec