git.giacomolli.uk - onechat/blob - daemon.go

   1 package main
   2
   3 import (
   4         "bufio"
   5         "context"
   6         "encoding/json"
   7         "errors"
   8         "fmt"
   9         "io"
  10         "log"
  11         "net"
  12         "os"
  13         "path/filepath"
  14         "sync"
  15         "time"
  16 )
  17
  18 const (
  19         // daemonAgentDirName is the directory of the root agent in the data
  20         // directory.
  21         daemonAgentDirName = "agent"
  22
  23         // daemonClientEvents is the number of events that can wait for a slow
  24         // client before the daemon drops it.
  25         daemonClientEvents = 1024
  26 )
  27
  28 // daemon runs "onechat daemon": it owns the root agent and its files and serves
  29 // the clients on the Unix socket in the data directory until ctx ends. When
  30 // telegram.json exists, it also runs the Telegram bot. It also keeps a linked
  31 // WhatsApp device connected. It holds the lock of the token file, so it is the
  32 // only process that refreshes the tokens and opens the WhatsApp session.
  33 func daemon(ctx context.Context, out io.Writer) (err error) {
  34         dir, err := dataDir()
  35         if err != nil {
  36                 return err
  37         }
  38
  39         // Check the socket path before the daemon writes a file, so that a data
  40         // directory with a long path stays empty.
  41         socket := filepath.Join(dir, socketFileName)
  42         err = checkSocketPath(socket)
  43         if err != nil {
  44                 return err
  45         }
  46
  47         config, err := loadConfig(dir)
  48         if err != nil {
  49                 return err
  50         }
  51
  52         botSettings, hasBot, err := loadTelegramConfig(dir)
  53         if err != nil {
  54                 return err
  55         }
  56
  57         tokens, err := lockTokens(dir)
  58         if err != nil {
  59                 return err
  60         }
  61
  62         defer func() {
  63                 err = errors.Join(err, tokens.Close())
  64         }()
  65
  66         whatsappSetDeviceProps()
  67         whatsapp, err := openWhatsApp(ctx, dir, time.Now, log.New(out, "whatsapp: ", log.LstdFlags), whatsappNewClient)
  68         if err != nil {
  69                 return err
  70         }
  71
  72         defer func() {
  73                 err = errors.Join(err, whatsapp.Close())
  74         }()
  75
  76         address, auth, err := modelEndpoint(config, dir)
  77         if err != nil {
  78                 return err
  79         }
  80
  81         agent, err := openAgent(filepath.Join(dir, daemonAgentDirName))
  82         if err != nil {
  83                 return err
  84         }
  85
  86         client := newModelClient(address, auth, agent.CacheKey(), filepath.Join(agent.dir, "usage.jsonl"))
  87         memory, err := openMemory(ctx, agent.dir, time.Now, newCompactor(client, agent.Prompt, config.Compactor))
  88         if err != nil {
  89                 return err
  90         }
  91
  92         defer func() {
  93                 err = errors.Join(err, memory.Close())
  94         }()
  95
  96         subagents := newSubagents(filepath.Join(agent.dir, subagentDirName), time.Now, subagentNameRandom)
  97         defer func() {
  98                 err = errors.Join(err, subagents.Close())
  99         }()
 100
 101         listener, err := daemonListenSocket(socket)
 102         if err != nil {
 103                 return err
 104         }
 105
 106         _, err = fmt.Fprintf(out, "onechat: %s on %s, %s at %s effort, in %s\n", agent.config.Name, listener.Addr(), agent.config.Model, agent.config.Effort, agent.config.Workdir)
 107         if err != nil {
 108                 return errors.Join(err, listener.Close())
 109         }
 110
 111         var telegram *TelegramBot
 112         if hasBot {
 113                 telegram = newTelegramBot(newTelegramAPI(telegramAPIURL, botSettings.Token), botSettings.Owner, filepath.Join(agent.dir, telegramOffsetFileName), log.New(out, "telegram: ", log.LstdFlags))
 114                 _, err = fmt.Fprintln(out, "onechat: the Telegram bot waits for messages of its owner")
 115                 if err != nil {
 116                         return errors.Join(err, listener.Close())
 117                 }
 118         }
 119
 120         return daemonServe(ctx, listener, telegram, whatsapp, func(notify func(Event)) (*TurnLoop, error) {
 121                 return newTurnLoop(agent, memory, subagents, whatsapp, client, time.Now, notify)
 122         })
 123 }
 124
 125 // DaemonHub holds the connected clients and sends each event to all of them. It
 126 // runs the WhatsApp commands of the clients on whatsapp.
 127 type DaemonHub struct {
 128         whatsapp *WhatsApp
 129
 130         mutex   sync.Mutex
 131         clients map[*DaemonClient]bool
 132         workers sync.WaitGroup
 133 }
 134
 135 // Accept serves each client of listener until the listener closes. A new
 136 // client gets a ready event with the name of the agent, and a busy event when a
 137 // turn runs.
 138 func (h *DaemonHub) Accept(ctx context.Context, listener net.Listener, l *TurnLoop) {
 139         for {
 140                 conn, err := listener.Accept()
 141                 if err != nil {
 142                         return
 143                 }
 144
 145                 client := &DaemonClient{
 146                         conn:   conn,
 147                         events: make(chan Event, daemonClientEvents),
 148                 }
 149
 150                 h.mutex.Lock()
 151                 h.clients[client] = true
 152                 h.mutex.Unlock()
 153
 154                 h.workers.Add(2)
 155                 go h.write(client)
 156                 go h.read(ctx, client, l)
 157
 158                 h.Send(client, Event{
 159                         Kind: "ready",
 160                         Text: l.agent.config.Name,
 161                 })
 162
 163                 if l.Busy() {
 164                         h.Send(client, Event{
 165                                 Kind: "busy",
 166                         })
 167                 }
 168         }
 169 }
 170
 171 // write sends the events of client as JSON lines until its channel closes.
 172 func (h *DaemonHub) write(client *DaemonClient) {
 173         defer h.workers.Done()
 174
 175         encoder := json.NewEncoder(client.conn)
 176         for event := range client.events {
 177                 err := encoder.Encode(event)
 178                 if err != nil {
 179                         h.drop(client)
 180                 }
 181         }
 182 }
 183
 184 // read runs the requests of client until it closes its connection.
 185 func (h *DaemonHub) read(ctx context.Context, client *DaemonClient, l *TurnLoop) {
 186         defer h.workers.Done()
 187         defer h.drop(client)
 188
 189         scanner := bufio.NewScanner(client.conn)
 190         scanner.Buffer(make([]byte, 64*1024), socketRequestBytes)
 191         for ctx.Err() == nil && scanner.Scan() {
 192                 var request SocketRequest
 193                 err := json.Unmarshal(scanner.Bytes(), &request)
 194                 if err == nil {
 195                         err = daemonRunRequest(l, h.whatsapp, request, func(text string) {
 196                                 h.Send(client, Event{
 197                                         Kind: "notice",
 198                                         Text: text,
 199                                 })
 200                         })
 201                 }
 202
 203                 if err != nil {
 204                         h.Send(client, Event{
 205                                 Kind: "error",
 206                                 Text: err.Error(),
 207                         })
 208                 }
 209         }
 210 }
 211
 212 // Send gives event to one client, or drops the client when its events do not
 213 // fit.
 214 func (h *DaemonHub) Send(client *DaemonClient, event Event) {
 215         h.mutex.Lock()
 216         defer h.mutex.Unlock()
 217
 218         h.send(client, event)
 219 }
 220
 221 // drop removes client and closes its connection.
 222 func (h *DaemonHub) drop(client *DaemonClient) {
 223         h.mutex.Lock()
 224         defer h.mutex.Unlock()
 225
 226         h.remove(client)
 227 }
 228
 229 // send gives event to client. The caller holds the mutex.
 230 func (h *DaemonHub) send(client *DaemonClient, event Event) {
 231         if !h.clients[client] {
 232                 return
 233         }
 234
 235         select {
 236         case client.events <- event:
 237         default:
 238                 h.remove(client)
 239         }
 240 }
 241
 242 // remove removes client, closes its connection, and ends its writer. The
 243 // caller holds the mutex.
 244 func (h *DaemonHub) remove(client *DaemonClient) {
 245         delete(h.clients, client)
 246         client.once.Do(func() {
 247                 close(client.events)
 248                 _ = client.conn.Close()
 249         })
 250 }
 251
 252 // Broadcast gives event to every client.
 253 func (h *DaemonHub) Broadcast(event Event) {
 254         h.mutex.Lock()
 255         defer h.mutex.Unlock()
 256
 257         for client := range h.clients {
 258                 h.send(client, event)
 259         }
 260 }
 261
 262 // CloseAll drops every client and waits for their readers and writers.
 263 func (h *DaemonHub) CloseAll() {
 264         h.mutex.Lock()
 265         for client := range h.clients {
 266                 h.remove(client)
 267         }
 268         h.mutex.Unlock()
 269
 270         h.workers.Wait()
 271 }
 272
 273 // DaemonClient is one connected client. Its events wait in a channel for the
 274 // writer, so a slow client does not stop the agent.
 275 type DaemonClient struct {
 276         conn   net.Conn
 277         events chan Event
 278         once   sync.Once
 279 }
 280
 281 // daemonListenSocket listens on the Unix socket at path, with mode 0600. The
 282 // caller owns the chat, so a socket file at path is left from a daemon that
 283 // ended, and daemonListenSocket removes it.
 284 func daemonListenSocket(path string) (net.Listener, error) {
 285         err := checkSocketPath(path)
 286         if err != nil {
 287                 return nil, err
 288         }
 289
 290         err = os.Remove(path)
 291         if err != nil && !errors.Is(err, os.ErrNotExist) {
 292                 return nil, fmt.Errorf("remove old socket: %w", err)
 293         }
 294
 295         listener, err := net.Listen("unix", path)
 296         if err != nil {
 297                 return nil, fmt.Errorf("listen on socket: %w", err)
 298         }
 299
 300         err = os.Chmod(path, 0o600)
 301         if err != nil {
 302                 return nil, errors.Join(fmt.Errorf("set socket mode: %w", err), listener.Close())
 303         }
 304
 305         return listener, nil
 306 }
 307
 308 // daemonServe runs the loop that start makes and serves the clients of listener
 309 // until ctx ends or the loop fails. It closes listener. It runs whatsapp, which
 310 // logs its batches and notes in the loop and tells all clients its notices, and
 311 // a failure of whatsapp stops the agent. When bot is not nil, it runs the bot
 312 // too, and a failure of the bot stops the agent.
 313 func daemonServe(ctx context.Context, listener net.Listener, bot *TelegramBot, whatsapp *WhatsApp, start func(notify func(Event)) (*TurnLoop, error)) error {
 314         ctx, cancel := context.WithCancel(ctx)
 315         defer cancel()
 316
 317         hub := &DaemonHub{
 318                 whatsapp: whatsapp,
 319                 clients:  make(map[*DaemonClient]bool),
 320         }
 321
 322         notify := hub.Broadcast
 323         if bot != nil {
 324                 notify = func(event Event) {
 325                         hub.Broadcast(event)
 326                         bot.Notify(event)
 327                 }
 328         }
 329
 330         l, err := start(notify)
 331         if err != nil {
 332                 return errors.Join(err, listener.Close())
 333         }
 334
 335         var workers sync.WaitGroup
 336         workers.Add(2)
 337         go func() {
 338                 defer workers.Done()
 339
 340                 hub.Accept(ctx, listener, l)
 341         }()
 342
 343         var whatsappErr error
 344         go func() {
 345                 defer workers.Done()
 346
 347                 whatsappErr = whatsapp.Run(ctx, l, notify)
 348                 cancel()
 349         }()
 350
 351         var botErr error
 352         if bot != nil {
 353                 workers.Add(1)
 354                 go func() {
 355                         defer workers.Done()
 356
 357                         botErr = bot.Run(ctx, l, whatsapp)
 358                         cancel()
 359                 }()
 360         }
 361
 362         err = l.Run(ctx)
 363         if errors.Is(err, context.Canceled) {
 364                 err = nil
 365         }
 366
 367         cancel()
 368         err = errors.Join(err, listener.Close())
 369         hub.CloseAll()
 370         workers.Wait()
 371
 372         return errors.Join(err, whatsappErr, botErr)
 373 }
 374
 375 // daemonRunRequest runs one request of a client. The answers of a WhatsApp
 376 // command go to answer.
 377 func daemonRunRequest(l *TurnLoop, whatsapp *WhatsApp, request SocketRequest, answer func(text string)) error {
 378         switch request.Type {
 379         case "send":
 380                 if request.Text == "" {
 381                         return errors.New("empty message")
 382                 }
 383
 384                 _, err := l.Submit(terminalSource, request.Text)
 385
 386                 return err
 387         case "interrupt":
 388                 if !l.Interrupt() {
 389                         return errors.New("no turn runs")
 390                 }
 391
 392                 return nil
 393         case "whatsapp":
 394                 whatsapp.Command(request.Text, answer)
 395
 396                 return nil
 397         case "stop":
 398                 found, err := l.StopSubagent(request.Text)
 399                 if err == nil && !found {
 400                         err = fmt.Errorf("no subagent %s runs", request.Text)
 401                 }
 402
 403                 return err
 404         default:
 405                 return fmt.Errorf("unknown request %q", request.Type)
 406         }
 407 }