91 lines
4.4 KiB
Markdown
91 lines
4.4 KiB
Markdown
# Token 计量
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[English](token-meter.md) | 中文
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`@deepseek-ai/dsh-token-meter` 公开一个独立的回放快照，用于表示请求压力与按位置计算的表层定价。`logRevision` 表示生成该计量中每个字段时所消费的持久事件数量。
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来源：[`packages/llm/token-meter/src/types.ts`](../../packages/llm/token-meter/src/types.ts)
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## `TokenMeasurement`
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```ts type-equiv
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/** Detached immutable request-pressure and surface snapshot at one consumed log revision. */
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interface TokenMeasurement {
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/** Number of durable events consumed; equal to the next unread event seq. */
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readonly logRevision: number
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/** Provider or heuristic anchor used for this measurement. */
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readonly baseline: TokenMeasurementBaseline
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/** Signed repricing of current surface content relative to the baseline anchor. */
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readonly surfaceDeltaTokens: number
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/** Non-negative current request-and-response pressure. */
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readonly totalTokens: number
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/** Total heuristic tokens across the current surface. */
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readonly surfaceTokens: number
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/** Current surface nodes in positional head-to-tail order. */
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readonly nodes: readonly TokenSurfaceNode[]
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}
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```
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`baseline.kind === 'usage'` 表示最近一次成功的提供方调用具有相同的规范请求信封，且该调用的总量不低于其完整启发式锚点。`estimated` 表示不存在可复用的保守 usage 锚点，因此服务使用固定启发式规则对完整信封和表层定价。后续成功请求会替换早先的锚点；有符号的 `surfaceDeltaTokens` 会保留相对于匹配锚点的增长与缩减。`totalTokens` 仍表示请求与响应压力，`surfaceTokens` 则是仅针对表层的启发式总量，等于所有节点价格之和。
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## `TokenSurfaceNode`
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```ts type-equiv
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/** One token-priced node in the current ordered session surface. */
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interface TokenSurfaceNode {
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/** Durable sequence number of the surface event. */
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readonly seq: number
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/** Heuristic tokens for the exact message projected by this node. */
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readonly tokens: number
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}
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```
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表层顺序具有权威性；替换节点的持久 seq 可能高于位置排在其后的节点。该快照不可变，不会随底层回放折叠推进而增长。
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<!-- BEGIN GENERATED cordis-surface (gen-cordis-catalog.ts) — do not edit between markers -->
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<a id="cordis-surface"></a>
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## Cordis API
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Generated from source by `scripts/gen-cordis-catalog.ts` (verified fresh by `pnpm run verify-cordis-catalog` in doc-sync; regenerate with `pnpm run gen-cordis-catalog`) — this section is byte-identical in both language sides of the page. Signature blocks use a `ts cordis-catalog` fence and keep the original source JSDoc; dispatch modes are defined in the [primer](../cordis-primer.md#dispatch-modes), and the framework-inherited `ctx` API lives in [cordis-api/inherited.md](../cordis-api/inherited.md).
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<a id="ctxtokenmeter--tokenmeterservice"></a>
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### `ctx.tokenMeter` — `TokenMeterService`
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Replay owner for one service-wide estimator and isolated per-session folds.
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```ts cordis-catalog
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/**
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* Measure current request pressure and surface through the durable tail.
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*
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* Provider usage is reused only when the latest successful call's canonical
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* request envelope matches `requestHeader` and its total is no lower than
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* that call's full heuristic anchor; otherwise the complete envelope and
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* surface are heuristically repriced.
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*
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* `requestHeader` affects request pressure only; surface fields always
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* describe the current session surface. Every call clones those positional
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* nodes, so measurement is O(surface).
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*
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* @param session - session to replay through its current durable tail.
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* @param requestHeader - optional effective request envelope replacing the latest logged header.
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* @returns a detached deeply immutable pressure and surface measurement.
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*/
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measure(session: Session, requestHeader?: EpochHeader): TokenMeasurement
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/**
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* Heuristically price one model-visible message (instance face of the pure
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* `estimateMessage` export from `estimate.ts`).
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* @param message - message to price without mutation.
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* @returns content and role-framing tokens under the fixed service heuristic.
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*/
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estimateMessage(message: Message): number
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```
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Types: [EpochHeader](session.md) · [Message](llm-streaming.md) · [Session](session.md)
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Source: [`packages/llm/token-meter/src/index.ts:74`](../../packages/llm/token-meter/src/index.ts)
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<!-- END GENERATED cordis-surface -->
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