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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,154 @@ | ||
| package pubsub | ||
|
|
||
| import ( | ||
| "io" | ||
| "log/slog" | ||
| "strings" | ||
|
|
||
| "github.com/charmbracelet/ssh" | ||
| "github.com/charmbracelet/wish" | ||
| "github.com/google/uuid" | ||
| ) | ||
|
|
||
| type Subscriber struct { | ||
| ID string | ||
| Name string | ||
| Session ssh.Session | ||
| Chan chan error | ||
| } | ||
|
|
||
| func (s *Subscriber) Wait() error { | ||
| err := <-s.Chan | ||
| return err | ||
| } | ||
|
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| type Msg struct { | ||
| Name string | ||
| Reader io.Reader | ||
| } | ||
|
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| type PubSub interface { | ||
| GetSubs() []*Subscriber | ||
| Sub(l *Subscriber) error | ||
| UnSub(l *Subscriber) error | ||
| Pub(msg *Msg) error | ||
| } | ||
|
|
||
| type PubSubMulticast struct { | ||
| Logger *slog.Logger | ||
| subs []*Subscriber | ||
| } | ||
|
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| func (b *PubSubMulticast) GetSubs() []*Subscriber { | ||
| b.Logger.Info("getsubs") | ||
| return b.subs | ||
| } | ||
|
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||
| func (b *PubSubMulticast) Sub(sub *Subscriber) error { | ||
| id := uuid.New() | ||
| sub.ID = id.String() | ||
| b.Logger.Info("sub", "channel", sub.Name, "id", id) | ||
| b.subs = append(b.subs, sub) | ||
| return sub.Wait() | ||
| } | ||
|
|
||
| func (b *PubSubMulticast) UnSub(rm *Subscriber) error { | ||
| b.Logger.Info("unsub", "channel", rm.Name, "id", rm.ID) | ||
| next := []*Subscriber{} | ||
| for _, sub := range b.subs { | ||
| if sub.ID != rm.ID { | ||
| next = append(next, sub) | ||
| } | ||
| } | ||
| b.subs = next | ||
| return nil | ||
| } | ||
|
|
||
| func (b *PubSubMulticast) Pub(msg *Msg) error { | ||
| log := b.Logger.With("channel", msg.Name) | ||
| log.Info("pub") | ||
|
|
||
| matches := []*Subscriber{} | ||
| writers := []io.Writer{} | ||
| for _, sub := range b.subs { | ||
| if sub.Name == msg.Name { | ||
| matches = append(matches, sub) | ||
| writers = append(writers, sub.Session) | ||
| } | ||
| } | ||
|
|
||
| if len(matches) == 0 { | ||
| log.Info("no subs found") | ||
| } | ||
|
|
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| log.Info("copying data") | ||
| writer := io.MultiWriter(writers...) | ||
| _, err := io.Copy(writer, msg.Reader) | ||
| if err != nil { | ||
| log.Error("pub", "err", err) | ||
| } | ||
| for _, sub := range matches { | ||
| sub.Chan <- err | ||
| b.UnSub(sub) | ||
| } | ||
|
|
||
| return err | ||
| } | ||
|
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| type Cfg struct { | ||
| Logger *slog.Logger | ||
| PubSub PubSub | ||
| } | ||
|
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| func PubSubMiddleware(cfg *Cfg) wish.Middleware { | ||
| return func(next ssh.Handler) ssh.Handler { | ||
| return func(sesh ssh.Session) { | ||
| args := sesh.Command() | ||
| if len(args) < 2 { | ||
| wish.Println(sesh, "USAGE: ssh send.pico.sh (sub|pub) {channel}") | ||
| next(sesh) | ||
| return | ||
| } | ||
|
|
||
| cmd := strings.TrimSpace(args[0]) | ||
| channel := args[1] | ||
| logger := cfg.Logger.With( | ||
| "cmd", cmd, | ||
| "channel", channel, | ||
| ) | ||
|
|
||
| logger.Info("running cli") | ||
|
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| if cmd == "help" { | ||
| wish.Println(sesh, "USAGE: ssh send.pico.sh (sub|pub) {channel}") | ||
| } else if cmd == "sub" { | ||
| sub := &Subscriber{ | ||
| Name: channel, | ||
| Session: sesh, | ||
| Chan: make(chan error), | ||
| } | ||
| err := cfg.PubSub.Sub(sub) | ||
| if err != nil { | ||
| wish.Errorln(sesh, err) | ||
| } | ||
| /* defer func() { | ||
| err = cfg.PubSub.UnSub(listener) | ||
| if err != nil { | ||
| wish.Errorln(sesh, err) | ||
| } | ||
| }() */ | ||
| } else if cmd == "pub" { | ||
| msg := &Msg{ | ||
| Name: channel, | ||
| Reader: sesh, | ||
| } | ||
| err := cfg.PubSub.Pub(msg) | ||
| wish.Errorln(sesh, err) | ||
| } else { | ||
| wish.Println(sesh, "USAGE: ssh send.pico.sh (sub|pub) {channel}") | ||
| } | ||
|
|
||
| next(sesh) | ||
| } | ||
| } | ||
| } |