67 lines
1.7 KiB
Go
67 lines
1.7 KiB
Go
package eventer
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import (
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// stdlib
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"log"
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)
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var (
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// List of known event handler.
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// Format:
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// - commands/CMDNAME - base handler for command. This what
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// networker will execute on any new command. Case-insensitive.
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// - internals/CMDNAME - all other internal things like database
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// access.
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// This map will not be changed after gonewsd initialization is
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// complete.
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events map[string]*EventHandler
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// Flag that indicates that we have completed events mapping
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// initialization.
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// RWMutex can be here, but we also need to write to log if we have
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// completed initialization.
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eventsInitialized bool
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)
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// Initialize initializes package.
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func Initialize() {
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log.Println("Initializing event handler...")
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events = make(map[string]*EventHandler)
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}
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// InitializeCompleted sets eventsInitialized bool to true to avoid
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// all further events mapping changes.
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func InitializeCompleted() {
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eventsInitialized = true
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log.Println("Events initialization completed")
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}
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// AddEventHandler adds event handler to a list of known handlers.
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func AddEventHandler(event *EventHandler) {
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if !eventsInitialized {
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events[event.Command] = event
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} else {
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log.Println("Can't add event '" + event.Command + "' to a list of known events - events mapping initialization already completed, no more changes allowed.")
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}
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}
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// LaunchEvent launches desired event in synchronous manner.
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func LaunchEvent(eventName string, data interface{}) (interface{}, error) {
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handler, exists := events[eventName]
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if !exists {
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return nil, ErrEventNotFound
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}
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returnedData := handler.Handler(data)
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return returnedData, nil
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}
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// Shutdown just nullifies eventer map.
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// Useful for testing and, maybe, reload.
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func Shutdown() {
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events = nil
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eventsInitialized = false
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}
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