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management_api.md

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Management REST interface

Log and Trace levels

Apart from the NGSI interface, Orion Context Broker exposes a REST API for management that allows to change the log level and the trace levels (whose initial value is set using -t and -logLevel command line options).

To change the log level:

curl -X PUT <host>:<port>/admin/log?level=<NONE|FATAL|ERROR|WARN|INFO|DEBUG>

To retrieve the log level:

curl <host>:<port>:/admin/log

which response follows the following pattern:

{
   "level": "INFO"
}

To manage the trace level:

curl --request DELETE <host>:<port>/log/trace
curl --request DELETE <host>:<port>/log/trace/t1
curl --request DELETE <host>:<port>/log/trace/t1-t2
curl --request DELETE <host>:<port>/log/trace/t1-t2,t3-t4
curl --request GET <host>:<port>/log/trace
curl --request PUT <host>:<port>/log/trace/t1
curl --request PUT <host>:<port>/log/trace/t1-t2
curl --request PUT <host>:<port>/log/trace/t1-t2,t3-t4

'PUT-requests' overwrite the previous log settings. So, in order to ADD a trace level, a GET /log/trace must be issued first and after that the complete trace string to be sent in the PUT request can be assembled.

Tracelevel related with input/output payloads

The following traceleves are particularly useful in order to make Orion print input/output payload in traces:

/* Input/Output payloads (180-199) */
  LmtServiceInputPayload = 180,
  LmtServiceOutPayload,
  LmtClientInputPayload,
  LmtClientOutputPayload = 183,  // Very important for harness test notification_different_sizes
  LmtPartialPayload,
  LmtClientOutputPayloadDump,
  LmtCPrForwardRequestPayload,
  LmtCPrForwardResponsePayload,

Thus, you can enable all them using:

curl --request PUT <host>:<port>/log/trace/180-199

Semaphores

Another useful (especially if the broker stops responding correctly) REST API is the semaphore listing offered:

curl <host>:<port>/admin/sem

The response is a listing of information of all the broker's semaphores:

{
    "alarmMgr": {
        "status": "free"
    },
    "connectionContext": {
        "status": "free"
    },
    "connectionEndpoints": {
        "status": "free"
    },
    "dbConnection": {
        "status": "free"
    },
    "dbConnectionPool": {
        "status": "free"
    },
    "logMsg": {
        "status": "free"
    },
    "metrics": {
        "status": "free"
     },
    "request": {
        "status": "free"
    },
    "subCache": {
        "status": "free"
    },
    "timeStat": {
        "status": "free"
    },
    "transaction": {
        "status": "free"
    }
}

Short explanation of the semaphores:

  • alarmMgr, protects the data of the Alarm Manager
  • connectionContext, protects the curl context for sending HTTP notifications/forwarded messages
  • connectionEndpoints, protects the curl endpoints when sending HTTP notifications/forwarded messages.
  • dbConnectionPool, protects mongo connection pool
  • dbConnection, protects the set of connections of the mongo connection pool
  • logMsg, makes sure that not two messages are written simultaneously to the log-file
  • metrics, protects internal data of the Metrics Manager
  • request, makes sure there are not two simultaneous requests to mongodb
  • subCache, protects the Subscription Cache
  • timeStat, protects the data for timing statistics
  • transaction, protects the Transaction ID (for the log-file)

The information supplied for each of the semaphores is:

  • status: free or taken

[ For now only one item per semaphore but the idea is to add more information in the future ]