1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
//! Dialogue session management for incremental turn execution.
//!
//! This module provides the DialogueSession type which allows consuming
//! dialogue turns one at a time as they complete, enabling streaming
//! and responsive UIs.
use super::super::{Agent, AgentError, Payload, PayloadMessage};
use super::message::{DialogueMessage, MessageMetadata, MessageOrigin, Speaker};
use super::state::SessionState;
use super::{BroadcastOrder, Dialogue, DialogueTurn, ExecutionModel, ParticipantInfo};
use crate::prompt::ToPrompt;
use tracing::{error, info};
/// Represents an in-flight dialogue execution that can yield turns incrementally.
pub struct DialogueSession<'a> {
pub(super) dialogue: &'a mut Dialogue,
pub(super) state: SessionState,
pub(super) model: ExecutionModel,
}
impl<'a> DialogueSession<'a> {
/// Returns the execution model backing this session.
pub fn execution_model(&self) -> ExecutionModel {
self.model.clone()
}
/// Retrieves the next available dialogue turn.
///
/// Returns `None` when the session is complete.
pub async fn next_turn(&mut self) -> Option<Result<DialogueTurn, AgentError>> {
let participant_total = self.dialogue.participants.len();
loop {
match &mut self.state {
SessionState::Broadcast(state) => {
if let Some(result) = state.try_emit(self.dialogue) {
return Some(result);
}
let current_turn = state.current_turn;
match state.pending.join_next().await {
Some(Ok((idx, name, result))) => {
let participant_name = name;
match &state.order {
BroadcastOrder::Completion => {
match &result {
Ok(content) => {
// Store in MessageStore
let participant = &self.dialogue.participants[idx];
let metadata = MessageMetadata::new()
.with_origin(MessageOrigin::AgentGenerated);
let message = DialogueMessage::new(
current_turn,
Speaker::agent(
participant_name.clone(),
participant.persona.role.clone(),
),
content.clone(),
)
.with_metadata(&metadata);
self.dialogue.message_store.push(message);
info!(
target = "llm_toolkit::dialogue",
mode = ?self.model,
participant = %participant_name,
participant_index = idx,
total_participants = participant_total,
event = "dialogue_turn_completed"
);
}
Err(err) => {
error!(
target = "llm_toolkit::dialogue",
mode = ?self.model,
participant = %participant_name,
participant_index = idx,
total_participants = participant_total,
error = %err,
event = "dialogue_turn_failed"
);
}
}
// Record result and continue to collect all responses
state.record_result(idx, participant_name, result);
continue;
}
BroadcastOrder::ParticipantOrder => {
match &result {
Ok(_) => {
info!(
target = "llm_toolkit::dialogue",
mode = ?self.model,
participant = %participant_name,
participant_index = idx,
total_participants = participant_total,
event = "dialogue_turn_completed"
);
}
Err(err) => {
error!(
target = "llm_toolkit::dialogue",
mode = ?self.model,
participant = %participant_name,
participant_index = idx,
total_participants = participant_total,
error = %err,
event = "dialogue_turn_failed"
);
}
}
state.record_result(idx, participant_name, result);
continue;
}
BroadcastOrder::Explicit(_) => {
// For Explicit order, process results based on the specified order
// For now, implement similar to Completion order
match &result {
Ok(content) => {
// Store in MessageStore
let participant = &self.dialogue.participants[idx];
let metadata = MessageMetadata::new()
.with_origin(MessageOrigin::AgentGenerated);
let message = DialogueMessage::new(
current_turn,
Speaker::agent(
participant_name.clone(),
participant.persona.role.clone(),
),
content.clone(),
)
.with_metadata(&metadata);
self.dialogue.message_store.push(message);
info!(
target = "llm_toolkit::dialogue",
mode = ?self.model,
turn = current_turn,
speaker = %participant_name,
role = %participant.persona.role,
participant_index = idx,
total_participants = participant_total,
event = "dialogue_turn_completed"
);
}
Err(err) => {
error!(
target = "llm_toolkit::dialogue",
mode = ?self.model,
turn = current_turn,
speaker = %participant_name,
participant_index = idx,
total_participants = participant_total,
error = %err,
event = "dialogue_turn_failed"
);
}
}
state.record_result(idx, participant_name, result);
continue;
}
}
}
Some(Err(join_err)) => {
error!(
target = "llm_toolkit::dialogue",
mode = ?self.model,
error = %join_err,
event = "dialogue_task_join_failed"
);
return Some(Err(AgentError::ExecutionFailed(format!(
"Broadcast task failed: {}",
join_err
))));
}
None => {
if let Some(result) = state.try_emit(self.dialogue) {
return Some(result);
}
self.state = SessionState::Completed;
return None;
}
}
}
SessionState::Sequential {
next_index,
current_turn,
sequence,
payload,
prev_agent_outputs,
current_turn_outputs,
participants_info,
} => {
if sequence.is_empty() || *next_index >= sequence.len() {
self.state = SessionState::Completed;
return None;
}
let sequence_position = *next_index;
let participant_idx = sequence[sequence_position];
let turn = *current_turn;
*next_index += 1;
let step_number = sequence_position + 1;
let step_total = sequence.len();
// Check if this is initial join before building payload
let participant = &self.dialogue.participants[participant_idx];
let participant_name = participant.name().to_string();
// Handle pending participant: apply JoiningStrategy and mark history as sent
let (joining_history_context, mark_all_as_sent) = if let Some(pending_info) =
self.dialogue.pending_participants.get(&participant_name)
{
let filtered_history: Vec<PayloadMessage> = {
let all_messages = self.dialogue.message_store.all_messages();
let message_refs: Vec<&DialogueMessage> = all_messages.to_vec();
let history_refs = pending_info
.joining_strategy
.historical_messages(&message_refs, turn);
// Convert to PayloadMessage to release the borrow
history_refs
.iter()
.map(|&msg| PayloadMessage::from(msg))
.collect()
};
// Remove from pending (before execution)
self.dialogue.pending_participants.remove(&participant_name);
(filtered_history, true)
} else {
(vec![], false) // Regular participant
};
// Mark all history data as sent for joining participant (after borrowing filtered_history)
if mark_all_as_sent {
let speaker = participant.to_speaker();
self.dialogue.message_store.mark_as_sent_all_for(speaker);
}
let mut prev_messages = joining_history_context;
prev_messages.append(prev_agent_outputs);
let mut response_payload = build_sequential_payload(
payload,
prev_messages.as_slice(),
current_turn_outputs.as_slice(), // Always include current turn outputs (sequential chain requirement)
participants_info.as_slice(),
sequence_position,
);
// Attach context if exists
if let Some(ref context) = self.dialogue.context {
response_payload = response_payload.with_context(context.to_prompt());
}
let response_result = {
let participant = &self.dialogue.participants[participant_idx];
participant.agent.execute(response_payload).await
};
return match response_result {
Ok(content) => {
let participant = &self.dialogue.participants[participant_idx];
let participant_name = participant.name().to_string();
let speaker = Speaker::agent(
participant_name.clone(),
participant.persona.role.clone(),
);
// Store in MessageStore
let metadata =
MessageMetadata::new().with_origin(MessageOrigin::AgentGenerated);
let message =
DialogueMessage::new(turn, speaker.clone(), content.clone())
.with_metadata(&metadata);
self.dialogue.message_store.push(message);
current_turn_outputs
.push(PayloadMessage::new(speaker.clone(), content.clone()));
let turn = DialogueTurn { speaker, content };
info!(
target = "llm_toolkit::dialogue",
mode = ?self.model,
participant = %participant_name,
step_index = participant_idx,
step_number,
total_steps = step_total,
event = "dialogue_turn_completed"
);
Some(Ok(turn))
}
Err(err) => {
error!(
target = "llm_toolkit::dialogue",
mode = ?self.model,
participant_index = participant_idx,
step_number,
total_steps = step_total,
error = %err,
event = "dialogue_turn_failed"
);
Some(Err(err))
}
};
}
SessionState::Failed(error) => {
if let Some(err) = error.take() {
self.state = SessionState::Completed;
return Some(Err(err));
}
self.state = SessionState::Completed;
return None;
}
SessionState::Completed => return None,
}
}
}
}
fn build_sequential_payload(
base_payload: &Payload,
prev_agent_outputs: &[PayloadMessage],
current_turn_outputs: &[PayloadMessage],
participants_info: &[ParticipantInfo],
idx: usize,
) -> Payload {
if idx == 0 {
let mut payload = base_payload.clone();
if !prev_agent_outputs.is_empty() {
payload = Payload::from_messages(prev_agent_outputs.to_vec()).merge(payload);
}
payload.with_participants(participants_info.to_vec())
} else {
// For idx > 0:
// 1. prev_agent_outputs (prior turn's agent outputs)
// 2. base_payload (new input)
// 3. current_turn_outputs (current turn's agent outputs so far)
let mut payload = base_payload.clone();
// Prepend prev_agent_outputs if present
if !prev_agent_outputs.is_empty() {
payload = Payload::from_messages(prev_agent_outputs.to_vec()).merge(payload);
}
// Append current_turn_outputs
if !current_turn_outputs.is_empty() {
payload = payload.merge(Payload::from_messages(current_turn_outputs.to_vec()));
}
payload.with_participants(participants_info.to_vec())
}
}