File size: 7,841 Bytes
d04f74a | 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 | /** Web presentation fold joining transient Assistant frames to one durable v2 settlement. */
import type {
SessionAssistantStreamBaseline,
SessionAssistantStreamFrame,
} from '../../types.ts'
import { expandAssistantStream } from '@deepseek-ai/dsh-llm/assistant-stream'
import type { AssistantStreamRecord } from '@deepseek-ai/dsh-llm/assistant-stream'
import type { LlmAttemptId } from '@deepseek-ai/dsh-llm/brand'
import type {
SessionAssistantSettlementEntry,
SessionEventLikeEntry,
SessionLiveEventEntry,
SessionTransientEventEntry,
} from '../contract/events.ts'
interface ActiveAttempt {
readonly attemptId: LlmAttemptId
readonly startedAfterSeq: number
readonly turn: number
readonly step: number
nextIndex: number
}
/** One Web publication decision from the assistant stream fold. */
export type ClientAssistantStreamResult =
| { readonly type: 'publish'; readonly entry: SessionLiveEventEntry }
| {
readonly type: 'settlement'
readonly attemptId: LlmAttemptId
readonly entry: SessionAssistantSettlementEntry
}
| { readonly type: 'abandonment'; readonly attemptId: LlmAttemptId }
| { readonly type: 'transient'; readonly entry: SessionTransientEventEntry }
| { readonly type: 'rebaseline' }
| undefined
/** Keeps transient Assistant presentation behind one settlement-aware interface. */
export class ClientAssistantStream {
private activeAttempt: ActiveAttempt | undefined
private readonly pending = new Map<number, SessionAssistantSettlementEntry>()
private publishedSeqs = new Set<number>()
private durableCursor = -1
private transientInGap = 0
/**
* Replace the durable Web window and adopt an optional reconnect baseline.
* @param entries - durable entries in the replacement window.
* @param baseline - compact prefix for an Assistant attempt that is still live.
* @returns immediately visible durable entries plus reconstructed transient chunks.
*/
replace(
entries: readonly SessionEventLikeEntry[],
baseline?: SessionAssistantStreamBaseline,
): readonly SessionEventLikeEntry[] {
this.pending.clear()
this.transientInGap = 0
this.activeAttempt = undefined
const opening = baseline?.activeAttempt
if (opening !== undefined) {
this.activeAttempt = {
attemptId: opening.attemptId,
startedAfterSeq: opening.startedAfterSeq,
turn: opening.turn,
step: opening.step,
nextIndex: opening.nextIndex,
}
}
const visible: SessionEventLikeEntry[] = [...entries]
this.publishedSeqs = new Set(visible.map(entry => entry.event.seq))
this.durableCursor = visible.reduce((cursor, entry) => Math.max(cursor, entry.event.seq), -1)
if (opening !== undefined) {
for (const [index, member] of expandAssistantStream(
opening.stream as unknown as readonly AssistantStreamRecord[],
).entries()) {
this.transientInGap += 1
visible.push({
type: 'transient',
event: {
type: 'assistant/live-chunk',
seq: this.durableCursor + 1 - 1 / (this.transientInGap + 1),
time: member.time,
data: {
attemptId: opening.attemptId,
turn: opening.turn,
step: opening.step,
chunk: member.chunk,
},
},
})
if (index + 1 >= opening.nextIndex) break
}
}
return visible
}
/**
* Stage one durable v2 settlement while its matching live attempt is open.
* @param entry - newly followed durable entry.
* @returns a publication decision, or `undefined` when no entry becomes visible.
*/
acceptDurable(entry: SessionLiveEventEntry): ClientAssistantStreamResult {
const event = entry.event
this.durableCursor = Math.max(this.durableCursor, event.seq)
this.transientInGap = 0
const settlement = assistantSettlementEntry(entry)
if (settlement !== undefined && this.attemptForSettlement(settlement.event) !== undefined) {
if (this.pending.has(event.seq)) return { type: 'rebaseline' }
this.pending.set(event.seq, settlement)
return undefined
}
return this.publish(entry)
}
/**
* Fold one dense transient frame and release its named durable settlement.
* @param frame - next Assistant stream frame received by the follow connection.
* @returns a transient, publication, or rebaseline decision, or `undefined` when no entry becomes visible.
*/
acceptFrame(frame: SessionAssistantStreamFrame): ClientAssistantStreamResult {
switch (frame.type) {
case 'start':
if (this.activeAttempt !== undefined || this.pending.size > 0) return { type: 'rebaseline' }
this.pending.clear()
this.activeAttempt = {
attemptId: frame.attemptId,
startedAfterSeq: frame.startedAfterSeq,
turn: frame.turn,
step: frame.step,
nextIndex: 0,
}
return undefined
case 'chunk': {
const attempt = this.activeAttempt
// A controller mounted after the Host saw this attempt has no start
// frame to reconstruct. Its durable settlement publishes directly;
// ignore the transient suffix until the next known start.
if (attempt === undefined || attempt.attemptId !== frame.attemptId) return undefined
if (frame.index !== attempt.nextIndex) return { type: 'rebaseline' }
attempt.nextIndex += 1
this.transientInGap += 1
return {
type: 'transient',
entry: {
type: 'transient',
event: {
type: 'assistant/live-chunk',
seq: this.durableCursor + 1 - 1 / (this.transientInGap + 1),
time: frame.time,
data: {
attemptId: frame.attemptId,
turn: attempt.turn,
step: attempt.step,
chunk: frame.chunk as never,
},
},
},
}
}
case 'end': {
const attempt = this.activeAttempt
if (attempt === undefined || attempt.attemptId !== frame.attemptId) {
return undefined
}
this.activeAttempt = undefined
if (frame.index !== attempt.nextIndex) return { type: 'rebaseline' }
if (frame.outcome.kind === 'abandoned') {
return this.pending.size === 0
? { type: 'abandonment', attemptId: attempt.attemptId }
: { type: 'rebaseline' }
}
if (this.publishedSeqs.has(frame.outcome.seq)) return undefined
const entry = this.pending.get(frame.outcome.seq)
if (entry === undefined
|| entry.event.type !== frame.outcome.eventType) {
return { type: 'rebaseline' }
}
this.pending.delete(frame.outcome.seq)
this.publishedSeqs.add(entry.event.seq)
return { type: 'settlement', attemptId: attempt.attemptId, entry }
}
}
}
private attemptForSettlement(
event: SessionAssistantSettlementEntry['event'],
): ActiveAttempt | undefined {
const attempt = this.activeAttempt
if (attempt === undefined
|| (event.type === 'assistant/message' && event.surfaceOp !== 'append')
|| event.seq <= attempt.startedAfterSeq
|| attempt.turn !== event.data.turn
|| attempt.step !== event.data.step) return undefined
return attempt
}
private publish(entry: SessionLiveEventEntry): ClientAssistantStreamResult {
this.publishedSeqs.add(entry.event.seq)
return { type: 'publish', entry }
}
}
function assistantSettlementEntry(
entry: SessionLiveEventEntry,
): SessionAssistantSettlementEntry | undefined {
return entry.event.type === 'assistant/message' || entry.event.type === 'assistant/attempt'
? entry as SessionAssistantSettlementEntry
: undefined
}
|