During the life cycle of a plumber API various events will be fired, either
automatically or manually. See the article on events in fiery
for a full overview. api_on() allows you to add handlers that are called
when specific events fire. api_off() can be used to remove the handler if
necessary
Usage
api_on(api, event, handler, id = NULL)
api_off(api, id)
Arguments
- api
A plumber2 api object to launch or stop
- event
A string naming the event to listen for
- handler
A function to call when event fires
- id
A string uniquely identifying the handler. If NULL a random id
will be generated making it impossible to remove the handler again
Value
These functions return the api object allowing for easy chaining
with the pipe