70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
// Copyright 2016 The Chihaya Authors. All rights reserved.
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// Use of this source code is governed by the BSD 2-Clause license,
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// which can be found in the LICENSE file.
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// Package event implements type-level constraints for dealing with the events
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// communicated via BitTorrent announce.
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package event
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import (
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"errors"
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"strings"
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)
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// ErrUnknownEvent is returned when New fails to return an event.
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var ErrUnknownEvent = errors.New("unknown event")
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// Event represents an event done by a BitTorrent client.
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type event uint8
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const (
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// None is the event when a BitTorrent client announces due to time lapsed
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// since the previous announce.
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None event = iota
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// Started is the event sent by a BitTorrent client when it joins a swarm.
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Started
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// Stopped is the event sent by a BitTorrent client when it leaves a swarm.
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Stopped
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// Completed is the event sent by a BitTorrent client when it finishes
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// downloading all of the required chunks.
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Completed
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)
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var (
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eventToString = make(map[event]string)
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stringToEvent = make(map[string]event)
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)
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func init() {
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eventToString[None] = "none"
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eventToString[Started] = "started"
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eventToString[Stopped] = "stopped"
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eventToString[Completed] = "completed"
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stringToEvent[""] = None
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stringToEvent["none"] = None
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stringToEvent["started"] = Started
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stringToEvent["stopped"] = Stopped
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stringToEvent["completed"] = Completed
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}
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// New returns the proper Event given a string.
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func New(eventStr string) (event, error) {
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if e, ok := stringToEvent[strings.ToLower(eventStr)]; ok {
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return e, nil
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}
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return None, ErrUnknownEvent
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}
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// String implements Stringer for an event.
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func (e event) String() string {
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if name, ok := eventToString[e]; ok {
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return name
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}
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panic("event: event has no associated name")
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}
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