General
opEvents versions 2.0 and newer provide a REST-style API for limited event management, e.g. creation and retrieval of single events, and lookup of events.
This version also comes with a simple client (both source and compiled), /usr/local/omk/bin/create_remote_event.pl (and .exe).
Authentication
Authentication is required to access any of the methods listed below.
POST to /login to Authenticate
POST /omk/opEvents/login
You must authenticate to opEvents first. Two parameters must be supplied as post-body, username and password.
Request
Parameter | Description |
|---|---|
| username | The username to authenticate with |
| password | The password for the user |
Successful Response
A cookie is created and sent with the response. This must be saved and used with subsequent requests.
Event Management
POST to /events for Event Creation
POST /omk/opEvents/events
The body of the request must be a valid JSON document, containing the desired event properties as a hash. Some properties (e.g. date, time) can be omitted and will be filled in automatically. As an absolute minimum, a node or a host property, and an event property must be present. If (and only if!) node is not present, then opEvents looks up host and attempts to find the canonical node for the hostname or IP address from the host property - this heuristic is described in more detail here. The resulting node must be known to opEvents and must not be disabled for opEvents.
Request Example
{
"node": "test-node",
"event": "Node Down",
"level": "Major",
"priority": 6,
"state": "down",
"stateful": "Node",
"details" : "Ping failed"
}
Successful Response
| HTTP Status | HTTP Headers | Body | Description |
|---|---|---|---|
| 201 | Location | JSON hash with success and id properties | The success property is set to 1 and only if the request was successful. The id property is the new event's ID (but see the Limitations section below) The Location header contains the complete URL for retrieving the newly created event. |
Unsuccessful Response
| HTTP Status | Body | Description |
|---|---|---|
| 401 | N/A | You are not authenticated. |
| 404 | N/A | You are authenticated but not authorised to create events in opEvents. |
| 400 | JSON hash with success being 0 and an error property. | The error property contains an explanation of what went wrong with your request, e.g. why the parameters were considered invalid. |
GET of /events for Event Listing
If your GET call provides an Accept header indicating JSON, or if you use /events.json as URI, then opEvents will look for matching events and return their properties in the form of a JSON array of hashes. Extra query parameters can be used to narrow down the listing or search for particular events only; without parameters you will get all events of the last two hours.
Optional Query Parameters
| Parameter | Description |
|---|---|
o_start, o_end | Start and end of the period you are interested in. Note, you should pass o_summarise=1 to make sure UNIX time is not rounded. |
o_node | Name of the node you are interested in. You can use " regex:<regular expression>" or a plain text string. |
ev_event_name | Name of the event you are interested in. You can use " regex:<regular expression>" or a plain text string. |
ev_event_type | Type of the event, i.e. what source it came from. e.g: nmis_eventlog, api. |
ev_event_element | Element in question. Not present for all events. Regex or plain text string. |
| Details that were supplied with the event. Not present for all events. Regex or plain text string. |
Successful Response
| HTTP Status | Body | Description |
|---|---|---|
| 200 | JSON array of hashes | Each array element is a hash of the raw properties of the event in question. |
Unsuccessful Response
| HTTP Status | Body | Description |
|---|---|---|
| 401 | N/A | You are not authenticated. |
| 404 | N/A | You are authenticated but not authorised to create events in opEvents. |
| 200 | Empty JSON array | Your request was valid, but there were no matching events. |
GET of /events/<eventid> for Event Retrieval
If your GET call provides an Accept header indicating JSON, or if you use /events/<eventid>.json as URI, then the event will be looked up and all properties will be returned in the form of a JSON hash.
Successful Response
| HTTP Status | Body |
|---|---|
| 200 | JSON hash with all known event properties. |
Unsuccessful Response
| HTTP Status | Body | Description |
|---|---|---|
| 401 | N/A | You are not authenticated. |
| 404 | N/A | You are authenticated but not authorised to view events in opEvents. |
| 404 | JSON hash with an error property. | The |
Limitations
- Events created by the REST API are subject to (stateful) deduplication, which is performed asynchronously and after the API call returns.
If your newly created event is eliminated by the deduplication process, then the event ID returned by the creation API call will point to a non-existent event.