Schedule Forced Host and Service Notifications and Event Handlers

[nagiosgwesterman]

SUMMARY

• The following two features were requested:
  1. Force send scheduled notifications:
     • Implement two new external commands - one for hosts and one for services.
     • The scheduled forced host notification takes a host name and notification time and, when executed, sends a notification for the specified host "near" the desired notification time.
     • The scheduled forced service notification does the same but additionally takes in a service description and sends the notification for the service.
  2. Force run scheduled event handler:
     • Implement two new external commands - one for hosts and one for services.
     • The scheduled forced host event handler takes a host name and notification time and, when executed, runs the event handler associated with the specified host "near" the desired notification time.
     • The scheduled forced service event handler does the same but additionally takes in a service description and runs the event handler associated with the service.

For internal reviewers, these are the actual feature requests: here and here.

IMPLEMENTATION

• I found it most straightforward to implement each of these new external commands within existing core functionality with new options.
• In order to both force and schedule the notifications and event handlers, I made the external commands schedule a forced check (either for a host or service, appropriately) which is a functionality that already exists.
• However, these checks do not necessarily send a notification or run an event handler. To ensure the notification is sent or the event handler runs, I added two new check options: CHECK_OPTION_FORCE_NOTIFICATION and CHECK_OPTION_FORCE_EVENT_HANDLER. When the check result is processed, it checks for these options and reacts accordingly.

TESTING PLAN

• Run each of the four new external commands and verify that they work properly.

1. SCHEDULE_FORCED_HOST_NOTIFICATION
2. SCHEDULE_FORCED_SVC_NOTIFICATION
3. SCHEDULE_FORCED_HOST_EVENT_HANDLER
4. SCHEDULE_FORCED_SVC_EVENT_HANDLER

• These require some setup to test (including setting up event handlers). Here are some docs to help with that:
  [1] Example external command
  [2] List of external commands
  [3] Setting up event handlers

• Please also check for code quality and any functional flaws in my prospective changes. There is a solid chance this is nowhere near to what was requested or is otherwise terrible. I learned a lot and that's what life is all about isn't it?

[aaronagios]

@tsadpbb would you please review?