wehub-resource-sync
61 lines
2.7 KiB
TypeScript
61 lines
2.7 KiB
TypeScript
import type { CompressionConfig } from "./types.ts";
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import type { CachingDetectionContext } from "./cachingAware.ts";
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import { detectCachingContext, getCacheAwareStrategy } from "./cachingAware.ts";
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import {
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normalizePreserveSystemPromptMode,
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resolvePreserveSystemPrompt,
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} from "./preserveSystemPromptMode.ts";
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import {
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resolvePrefixFreezeConfig,
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extractStablePrefixHash,
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observePrefix,
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isPrefixFrozen,
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} from "./prefixFreeze.ts";
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/**
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* T08/H5 — augment the static cache signal with usage-observed prefix freeze. Opt-in
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* (default off): when a system prompt has recurred `>= threshold` times, treat it as a stable
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* cacheable prefix to preserve even for a provider the static check does not flag as caching.
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* "Freeze" only *preserves* the prefix, so it never corrupts a payload.
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*/
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function observeAndCheckPrefixFreeze(body: Record<string, unknown>): boolean {
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const cfg = resolvePrefixFreezeConfig();
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if (!cfg.enabled) return false;
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const hash = extractStablePrefixHash(body);
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if (!hash) return false;
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observePrefix(hash);
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return isPrefixFrozen(hash, cfg.threshold);
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}
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/**
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* #3890/#3955 + T05/C5: materialize the engine-facing `preserveSystemPrompt`
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* boolean from the authoritative `preserveSystemPromptMode` intent, using the
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* cache-aware `skipSystemPrompt` signal that `getCacheAwareStrategy` already
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* computes (a caching provider — or `cache_control` — means the system prompt is
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* part of the cacheable prefix, so compressing it breaks the upstream cache).
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*
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* This generalizes the previous hard-coded "force `true` when a cache is present
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* and the operator disabled preservation" into the three modes:
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* - `always` → always `true`.
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* - `whenNoCache` → `true` only when a cache is present (the legacy `false`
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* behaviour — preserved exactly for back-compat).
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* - `never` → always `false`, even when it breaks a prompt cache.
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*/
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export function resolveCacheAwareConfig(
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config: CompressionConfig,
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body?: Record<string, unknown>,
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context?: CachingDetectionContext
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): CompressionConfig {
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const mode = normalizePreserveSystemPromptMode(config);
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// No request body → no cacheable prefix to detect; honor the mode at its no-cache baseline.
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// The signal is the static caching heuristic OR (H5, opt-in) a usage-observed stable prefix.
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const staticCache = body
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? getCacheAwareStrategy(config.defaultMode, detectCachingContext(body, context))
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.skipSystemPrompt
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: false;
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const hasCache = staticCache || (body ? observeAndCheckPrefixFreeze(body) : false);
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const effective = resolvePreserveSystemPrompt(mode, { hasCache });
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if (effective === config.preserveSystemPrompt) return config;
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return { ...config, preserveSystemPrompt: effective };
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}
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