mirror of
https://github.com/deepseek-ai/deepseek-harness
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70 lines
3.1 KiB
TypeScript
70 lines
3.1 KiB
TypeScript
/**
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* Per-loop-instance transmission bookkeeping for the reconstructability
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* contract: which header event to append before a request so the session log
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* always explains the request (the reconstructability RFC). The loop is
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* otherwise transmission-stateless — the comparison baseline is the log's own
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* folded header (`Session.requestHeader()`), so resume and fork need no
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* special path: a fresh loop instance simply logs a `'resume'` snapshot on
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* its first request and full changed-header snapshots from there.
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*
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* @module dsh-agent-loop/request-log
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*/
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import { headerEquals } from '@deepseek-ai/dsh-session'
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import type { EpochHeader, Session } from '@deepseek-ai/dsh-session'
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import type { Message } from '@deepseek-ai/dsh-llm'
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/** Per-loop-instance bookkeeping: whether THIS instance has logged a header yet. */
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export interface TransmissionLog {
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/** True once this loop instance appended its anchoring `request/header` snapshot. */
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loggedHeader: boolean
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/**
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* The instance's composed session prefix (the `agent/session-prefix`
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* waterfall's deep-frozen product), cached on the instance's first
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* request-building step and reused verbatim for every request it sends —
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* the structural guarantee that the prefix never changes mid-session.
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* `undefined` until composed.
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*/
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sessionPrefix?: Message[]
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}
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/**
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* Fresh bookkeeping for a newly-started loop instance.
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* @returns state with `loggedHeader` false, so the instance's first request appends an anchoring snapshot.
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*/
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export function createTransmissionLog(): TransmissionLog {
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return { loggedHeader: false }
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}
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/**
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* Append whatever header event this request owes the log, so folding the log
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* reproduces the header the request was built under. Exactly one of three
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* things happens:
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*
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* 1. This loop instance has not logged a header yet → a full `request/header`
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* snapshot anchors the fold: reason `'initial'` when the log has no header
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* events at all (a new conversation), `'resume'` when it does (process
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* restart, fork seed — the boundary itself is a recorded fact, so the
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* snapshot is appended even when nothing changed).
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* 2. The header equals the folded baseline → nothing; the log already
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* explains this request.
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* 3. It differs → a full snapshot with reason `'change'`.
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*
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* @param session - the session whose log explains the request.
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* @param state - this loop instance's bookkeeping (mutated on first log).
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* @param header - the canonical header the request will ACTUALLY use
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* (post-`agent/request`).
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*/
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export function recordRequestHeader(session: Session, state: TransmissionLog, header: EpochHeader): void {
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if (!state.loggedHeader) {
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session.append('request/header', { header, reason: session.requestHeader() === undefined ? 'initial' : 'resume' })
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state.loggedHeader = true
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return
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}
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// This instance logged a snapshot, so the fold is necessarily defined.
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// eslint-disable-next-line @typescript-eslint/no-non-null-assertion
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const baseline = session.requestHeader()!
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if (headerEquals(baseline, header)) return
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session.append('request/header', { header, reason: 'change' })
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}
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