13 // newTurnLoop returns the loop of agent with its memory, its subagents, and the
14 // WhatsApp link and the schedules of its tools. Its calls go through client,
15 // and notify gets each event. The clock gives the date of a turn. logger gets
16 // the failed turns and the ends of the subagents.
17 func newTurnLoop(agent *Agent, memory *Memory, subagents *Subagents, whatsapp *WhatsApp, schedules *Schedules, client ChainClient, clock func() time.Time, logger *log.Logger, notify func(Event)) (*TurnLoop, error) {
18 layout, err := loadViewLayout(filepath.Join(agent.dir, viewLayoutFileName))
31 wake: make(chan struct{}, 1),
34 l.runs = &SubagentRuns{
46 running: make(map[string]*SubagentRun),
56 workdir: agent.config.Workdir,
62 // Event tells the clients what the agent does as it happens. Kind is the kind
63 // of a logged message (user, reply, tool, echo, note, work), or one of ready,
64 // busy, idle, error, and subagent, which tells that the subagent Text starts a
65 // run. ID is the ID of a logged message. Source names the client that sent a
66 // user message, such as terminal or telegram, so that each client can show the
67 // messages of the others, or the subagent of a report. Status tells how the run
68 // of a report ended: finished, stopped, or failed.
70 Kind string `json:"kind"`
71 ID int `json:"id,omitempty"`
72 Text string `json:"text,omitempty"`
73 Source string `json:"source,omitempty"`
74 Status string `json:"status,omitempty"`
77 // TurnLoop runs the turns of one agent. A user message goes to the log when it
78 // comes, and it wakes the loop. A turn waits until every message before it is
79 // summarized. Then the turn runs a Chain whose first request holds the prompt,
80 // the tools, and the input of turnInput.
82 // The view goes out as the messages of a ViewLayout, so the first request of a
83 // turn reads the view of the turn before from the prompt cache. User messages
84 // that come during a turn join the next request of its chain after the tool
85 // results, and so do the reports of the subagents. The subagents run until the
87 type TurnLoop struct {
94 clock func() time.Time
101 cancel context.CancelFunc
105 // Submit logs a user message from the client source and wakes the loop. The
106 // message joins the next request: the first one of a new turn, or the next one
107 // of a running turn.
108 func (l *TurnLoop) Submit(source, text string) (Message, error) {
109 message, err := l.record("user", source, text)
111 return Message{}, err
116 l.pending = append(l.pending, message)
120 case l.wake <- struct{}{}:
127 // Report logs the report text of the subagent name as a work message and tells
128 // the clients, with the status of the run. Unless the subagent was stopped, the
129 // report joins the waiting messages and wakes the loop, as a user message of
130 // Submit does. A failed write stops the loop, because the log refuses all
132 func (l *TurnLoop) Report(name, text, status string) {
133 message, err := l.Work(name, text, status)
136 l.fail(fmt.Errorf("%w: %w", errChainLogWrite, err))
137 case status != subagentStopped:
142 // Work logs text as a work message of source, such as the name of a subagent,
143 // and tells the clients, with status. The message starts no turn until it goes
145 func (l *TurnLoop) Work(source, text, status string) (Message, error) {
146 message, err := l.memory.Append("work", text)
148 return Message{}, err
162 // Wake adds the logged messages to the waiting messages and wakes the loop
163 // once, as a user message of Submit does. They join the first request of a new
164 // turn together, or the next request of a running turn after the tool results.
165 func (l *TurnLoop) Wake(messages ...Message) {
166 if len(messages) == 0 {
172 l.pending = append(l.pending, messages...)
176 case l.wake <- struct{}{}:
181 // StopSubagent ends the run of the subagent name and tells if it ran. Its
182 // report is logged, but it starts no turn.
183 func (l *TurnLoop) StopSubagent(name string) (bool, error) {
184 return l.runs.Stop(name)
187 // Interrupt ends the running turn. A running tool is killed, and the turn sends
188 // no further request.
189 func (l *TurnLoop) Interrupt() bool {
191 defer l.mutex.Unlock()
202 // Busy tells if a turn runs.
203 func (l *TurnLoop) Busy() bool {
205 defer l.mutex.Unlock()
207 return l.cancel != nil
210 // Append logs a message and tells the clients. The toolbox logs its calls and
211 // results through it.
212 func (l *TurnLoop) Append(kind, text string) (Message, error) {
213 return l.record(kind, "", text)
216 // Flush makes the log durable.
217 func (l *TurnLoop) Flush(ctx context.Context) error {
218 return l.memory.Flush(ctx)
221 // Run runs a turn each time user messages or reports wait, until ctx ends. It
222 // returns the error of a failed log write, which stops the agent. At its start
223 // it resumes the subagents that a stop of the daemon cut, and at its end it
224 // ends the runs of the subagents and waits for them.
225 func (l *TurnLoop) Run(ctx context.Context) error {
228 err := l.runs.Resume(ctx)
230 return fmt.Errorf("resume subagents: %w", err)
254 // note logs a note and tells the clients. A note starts no turn.
255 func (l *TurnLoop) note(text string) error {
256 _, err := l.record("note", "", text)
261 // record logs a message and tells the clients, with the client source of a user
263 func (l *TurnLoop) record(kind, source, text string) (Message, error) {
264 message, err := l.memory.Append(kind, text)
266 return Message{}, err
279 // waiting tells if user messages or reports wait for a request.
280 func (l *TurnLoop) waiting() bool {
282 defer l.mutex.Unlock()
284 return len(l.pending) > 0
287 // fail stops the loop with err.
288 func (l *TurnLoop) fail(err error) {
291 l.failure = errors.Join(l.failure, err)
295 case l.wake <- struct{}{}:
300 // failed returns the error of a failed write of a report.
301 func (l *TurnLoop) failed() error {
303 defer l.mutex.Unlock()
308 // turn runs one turn. A failed or interrupted model call ends the turn and
309 // tells the clients. A failure also goes to the logger, so that it is not lost
310 // when no client is connected, but an interrupt does not. The messages of the
311 // turn stay in the log and the view, and the next turn starts only with a new
312 // message, so a lasting failure such as a needed login does not repeat. Only a
313 // failed log write is an error of turn.
314 func (l *TurnLoop) turn(ctx context.Context) error {
315 ctx, cancel := context.WithCancel(ctx)
335 if err != nil && !errors.Is(err, errChainLogWrite) {
336 if ctx.Err() == nil {
337 l.logger.Printf("turn failed: %v", err)
342 Text: turnError(ctx, err),
355 // chain runs the request chain of a turn until the final answer.
356 func (l *TurnLoop) chain(ctx context.Context) error {
358 if len(messages) == 0 {
362 err := l.memory.Wait(ctx)
367 instructions, err := l.agent.Prompt()
372 skip := make(map[int]bool, len(messages))
373 for _, message := range messages {
374 skip[message.ID] = true
377 view, err := l.layout.Split(l.memory.ViewLines(skip))
385 request: ModelRequest{
386 Model: l.agent.config.Model,
387 Effort: l.agent.config.Effort,
388 Instructions: instructions,
389 Tools: promptTools(),
394 _, err = chain.Run(ctx, turnInput(view, l.state(), messages))
399 // take returns the user messages that wait for a request, and removes them.
400 func (l *TurnLoop) take() []Message {
402 defer l.mutex.Unlock()
404 messages := l.pending
410 // state returns the per-turn state: the end of the view, and the date and time
412 func (l *TurnLoop) state() string {
413 return "</chat>\n\nNow: " + l.clock().Format("Monday 2006-01-02 15:04 -07:00")
416 // turnError returns the text of the error that ended a turn.
417 func turnError(ctx context.Context, err error) string {
418 if ctx.Err() != nil {
425 // turnInput returns the input of the first request of a turn, stable parts
426 // first: a user message for each view message, one with the per-turn state,
427 // and one for each new message, whole. The view leaves out the leaf lines of
429 func turnInput(view []string, state string, messages []Message) []any {
430 input := make([]any, 0, len(view)+1+len(messages))
431 for _, text := range view {
432 input = append(input, modelUserMessage(text))
435 input = append(input, modelUserMessage(state))
436 for _, message := range messages {
437 input = append(input, modelUserMessage(message.Text))