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airship-in-a-bottle
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UCP Component Health Check API Endpoint 

As discussed, each UCP component will return a simple
response using HTTP Codes to indicate that it is alive

Enhancements to the health check endpoint will be made
at a later stage

Change-Id: I52eb333191fc148d2ea543632c798a3c087347d8
This commit is contained in:
Anthony Lin 2017-09-01 21:41:04 +00:00
parent 383dcaeb4e
commit e66a6507ad
1 changed files with 67 additions and 0 deletions
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67
docs/api-conventions.md
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@ -129,3 +129,70 @@ Success message example:
"code": 200
}
```
## Health Check API
Each UCP component shall expose an endpoint that allows other component
to access and validate its health status. The response shall be received
within 30 seconds.
### GET /v1.0/health
Invokes a UCP component to return its health status
#### Health Check Output
The current design will be for the UCP component to return an empty response
to show that it is alive and healthy. This means that the UCP component that
is performing the query will receive HTTP response code 204.
HTTP response code 503 will be returned if the UCP component fails to receive
any response from the component that it is querying. The time out will be set
to 30 seconds.
### GET /v1.0/health/extended
Invokes a UCP component to return its detailed health status. Authentication
will be required to invoke this API call.
This feature will be implemented in the future.
#### Extended Health Check Output
The output structure reuses the Kubernetes Status kind to represent the health
check results. The Status kind will be returned for both successful and failed
health checks to ensure consistencies. The message field will contain summary
information related to the results of the health check. Detailed information
of the health check will be provided as well.
Failure message example:
```
{
"kind": "Status",
"apiVersion": "v1",
"metadata": {},
"status": "Service Unavailable",
"message": "{{UCP Component Name}} failed to respond",
"reason": "Health Check",
"details": {
"errorCount": {{n}},
"errorList": [
{ "message" : "{{Detailed Health Check failure information}}"},
...
]
},
"code": 503
}
```
Success message example:
```
{
"kind": "Status",
"apiVersion": "v1",
"metadata": {},
"status": "Healthy",
"message": "",
"reason": "Health Check",
"details": {
"errorCount": 0,
"errorList": []
},
"code": 200
}
```