commit b7028ebff16566762b71cdbc597c1244529d208a
author Spencer Ku <Spencer.Ku@quantatw.com> Tue Oct 26 15:27:35 2021 +0800
committer Spencer Ku <Spencer.Ku@quantatw.com> Thu Nov 04 08:05:26 2021 +0800
tree 9236974696dac002cb871578ab289572582880ae
parent c52ee72b01507e3ee1fca3fdf79c1d2748439357

Redfish: Support Host Log Entries

This commit is designing and implementing a new logging service in
Redfish to expose host serial console logs.The goal is that clients
can talk to bmc via Redfish and get a real-time console. It will improve
the debuggability of BMCs.

We will add three paths to redfish tree to implement the feature:
1. /redfish/v1/Systems/system/LogServices/HostLogger
2. /redfish/v1/Systems/system/LogServices/HostLogger/Entries
3. /redfish/v1/Systems/system/LogServices/HostLogger/Entries/<str>

To use this feature, we expect to use phosphor-hostlogger(stream mode)
+ rsyslog + bmcweb. Phosphor-hostlooger in stream mode forwards the byte
stream into rsyslog via the imuxsock module. The log is persisted via
the omfile module as soon as collected. It makes Host Logger leverage
exsisting tools (rsyslog and logrotate). Then we can expose host serial
console logs via bmcweb.

This feature can be enabled or disabled by setting the option
"redfish-host-logger", and the default value is "enabled". If you don't
want to expose host serial console logs, you need to turn the value to
"disabled".

Sample Output:
curl -k -H "X-Auth-Token: $token" -X GET https://${bmc}/redfish/v1/Systems/system/LogServices/HostLogger/
{
  "@odata.id": "/redfish/v1/Systems/system/LogServices/HostLogger",
  "@odata.type": "#LogService.v1_1_0.LogService",
  "Description": "Host Logger Service",
  "Entries": {
    "@odata.id": "/redfish/v1/Systems/system/LogServices/HostLogger/Entries"
  },
  "Id": "HostLogger",
  "Name": "Host Logger Service"
}

curl -k -H "X-Auth-Token: $token" -X GET https://${bmc}/redfish/v1/Systems/system/LogServices/HostLogger/Entries
{
  "@odata.id": "/redfish/v1/Systems/system/LogServices/HostLogger/Entries",
  "@odata.type": "#LogEntryCollection.LogEntryCollection",
  "Description": "Collection of HostLogger Entries",
  "Members": [
    {
      "@odata.id": "/redfish/v1/Systems/system/LogServices/HostLogger/Entries/0",
      "@odata.type": "#LogEntry.v1_4_0.LogEntry",
      "EntryType": "Oem",
      "Id": "0",
      "Message": "123123",
      "Name": "Host Logger Entry",
      "OemRecordFormat": "Host Logger Entry",
      "Severity": "OK"
    }
  ],
  "Members@odata.count": 1,
  "Name": "HostLogger Entries"
}

curl -k -H "X-Auth-Token: $token" -X GET https://${bmc}/redfish/v1/Systems/system/LogServices/HostLogger/Entries/0
{
  "@odata.id": "/redfish/v1/Systems/system/LogServices/HostLogger/Entries/0",
  "@odata.type": "#LogEntry.v1_4_0.LogEntry",
  "EntryType": "Oem",
  "Id": "0",
  "Message": "123123",
  "Name": "Host Logger Entry",
  "OemRecordFormat": "Host Logger Entry",
  "Severity": "OK"
}

Signed-off-by: Spencer Ku <Spencer.Ku@quantatw.com>
Change-Id: I4ad2652a80fb1c441a25382b7d422ecd7ffc8557