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Philipp Heckel 2021-10-22 18:54:02 -04:00
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Apache License
Version 2.0, January 2004
http://www.apache.org/licenses/
TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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"Contribution" shall mean any work of authorship, including
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to that Work or Derivative Works thereof, that is intentionally
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by such Contributor that are necessarily infringed by their
Contribution(s) alone or by combination of their Contribution(s)
with the Work to which such Contribution(s) was submitted. If You
institute patent litigation against any entity (including a
cross-claim or counterclaim in a lawsuit) alleging that the Work
or a Contribution incorporated within the Work constitutes direct
or contributory patent infringement, then any patent licenses
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as of the date such litigation is filed.
4. Redistribution. You may reproduce and distribute copies of the
Work or Derivative Works thereof in any medium, with or without
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meet the following conditions:
(a) You must give any other recipients of the Work or
Derivative Works a copy of this License; and
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or as an addendum to the NOTICE text from the Work, provided
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You may add Your own copyright statement to Your modifications and
may provide additional or different license terms and conditions
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5. Submission of Contributions. Unless You explicitly state otherwise,
any Contribution intentionally submitted for inclusion in the Work
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module heckel.io/notifyme
go 1.16

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package main
import (
"context"
"encoding/json"
"errors"
"io"
"log"
"math/rand"
"net/http"
"sync"
"time"
)
type Message struct {
Time int64 `json:"time"`
Message string `json:"message"`
}
type Channel struct {
id string
listeners map[int]listener
last time.Time
ctx context.Context
mu sync.Mutex
}
type Server struct {
channels map[string]*Channel
mu sync.Mutex
}
type listener func(msg *Message)
func main() {
s := &Server{
channels: make(map[string]*Channel),
}
go func() {
for {
time.Sleep(5 * time.Second)
s.mu.Lock()
log.Printf("channels: %d", len(s.channels))
s.mu.Unlock()
}
}()
http.HandleFunc("/", s.handle)
if err := http.ListenAndServe(":9997", nil); err != nil {
log.Fatalln(err)
}
}
func (s *Server) handle(w http.ResponseWriter, r *http.Request) {
if err := s.handleInternal(w, r); err != nil {
w.WriteHeader(http.StatusInternalServerError)
_, _ = io.WriteString(w, err.Error())
}
}
func (s *Server) handleInternal(w http.ResponseWriter, r *http.Request) error {
if len(r.URL.Path) == 0 {
return errors.New("invalid path")
}
channel := s.channel(r.URL.Path[1:])
switch r.Method {
case http.MethodGet:
return s.handleGET(w, r, channel)
case http.MethodPut:
return s.handlePUT(w, r, channel)
default:
return errors.New("invalid method")
}
}
func (s *Server) handleGET(w http.ResponseWriter, r *http.Request, ch *Channel) error {
fl, ok := w.(http.Flusher)
if !ok {
return errors.New("not a flusher")
}
listenerID := rand.Int()
l := func (msg *Message) {
json.NewEncoder(w).Encode(&msg)
fl.Flush()
}
ch.mu.Lock()
ch.listeners[listenerID] = l
ch.last = time.Now()
ch.mu.Unlock()
select {
case <-ch.ctx.Done():
case <-r.Context().Done():
}
ch.mu.Lock()
delete(ch.listeners, listenerID)
if len(ch.listeners) == 0 {
s.mu.Lock()
delete(s.channels, ch.id)
s.mu.Unlock()
}
ch.mu.Unlock()
return nil
}
func (s *Server) handlePUT(w http.ResponseWriter, r *http.Request, ch *Channel) error {
ch.mu.Lock()
defer ch.mu.Unlock()
if len(ch.listeners) == 0 {
return errors.New("no listeners")
}
defer r.Body.Close()
ch.last = time.Now()
msg, _ := io.ReadAll(r.Body)
for _, l := range ch.listeners {
l(&Message{
Time: time.Now().UnixMilli(),
Message: string(msg),
})
}
return nil
}
func (s *Server) channel(channelID string) *Channel {
s.mu.Lock()
defer s.mu.Unlock()
c, ok := s.channels[channelID]
if !ok {
ctx, _ := context.WithCancel(context.Background()) // FIXME
c = &Channel{
id: channelID,
listeners: make(map[int]listener),
last: time.Now(),
ctx: ctx,
mu: sync.Mutex{},
}
s.channels[channelID] = c
}
return c
}