feat(web): add durable session metrics (round 1)
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Hypatia May
277
packages/host/apiproxy/tests/session-metrics.spec.ts
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277
packages/host/apiproxy/tests/session-metrics.spec.ts
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import { describe, expect, it, vi } from 'vitest'
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import { Context } from 'cordis'
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import type { Agent, AgentLlmTarget } from '@deepseek-ai/dsh-agent'
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import { Session, SessionId } from '@deepseek-ai/dsh-session'
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import { affectsSessionMetrics, SessionMetricsProjector } from '../src/session-metrics.ts'
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function assistant(
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session: Session,
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turn: number,
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step: number,
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usage: {
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inputTokens: number
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outputTokens: number
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cacheReadTokens?: number
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cacheWriteTokens?: number
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},
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): void {
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session.append('assistant/chunk', {
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turn,
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step,
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chunk: { type: 'usage', usage },
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})
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session.append('assistant/message', {
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turn,
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step,
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content: [{ type: 'text', text: `answer-${turn}-${step}` }],
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provenance: { provider: 'test', model: 'alpha' },
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usage,
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}, { surfaceOp: 'append' })
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}
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function agent(session: Session): Agent {
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return { id: session.id, session } as Agent
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}
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describe('SessionMetricsProjector', () => {
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it('filters text/reasoning stream deltas while retaining usage, headers, and surface mutations', () => {
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const session = new Session(SessionId('metrics-filter'))
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const text = session.append('assistant/chunk', {
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turn: 1,
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step: 1,
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chunk: { type: 'text-delta', index: 0, text: 'x' },
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})
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const usage = session.append('assistant/chunk', {
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turn: 1,
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step: 1,
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chunk: { type: 'usage', usage: { inputTokens: 1, outputTokens: 1 } },
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})
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const header = session.append('request/header', {
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header: { config: { provider: 'test', model: 'alpha' } },
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reason: 'initial',
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})
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const surface = session.append('user/message', {
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content: [{ type: 'text', text: 'question' }],
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source: { kind: 'user' },
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}, { surfaceOp: 'append' })
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expect(affectsSessionMetrics(text)).toBe(false)
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expect(affectsSessionMetrics(usage)).toBe(true)
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expect(affectsSessionMetrics(header)).toBe(true)
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expect(affectsSessionMetrics(surface)).toBe(true)
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})
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it('reconciles usage by turn:step, keeps cache writes disjoint, and survives a surface replacement', () => {
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const ctx = new Context()
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ctx.provide('tokenMeter', {
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measure(session: Session) {
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return { totalTokens: session.surface.nodes.length * 100 }
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},
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})
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const session = new Session(SessionId('metrics-fold'))
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const first = session.append('user/message', {
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content: [{ type: 'text', text: 'large old surface' }],
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source: { kind: 'user' },
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}, { surfaceOp: 'append' })
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assistant(session, 1, 1, {
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inputTokens: 11,
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outputTokens: 3,
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cacheReadTokens: 89,
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cacheWriteTokens: 8,
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})
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const current: AgentLlmTarget = { provider: 'test', model: 'alpha' }
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const projector = new SessionMetricsProjector(ctx, () => current, () => {})
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const attached = agent(session)
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const before = projector.snapshot(session, attached)
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expect(before).toMatchObject({
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uncachedInputTokens: 11,
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outputTokens: 3,
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cacheReadTokens: 89,
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cacheWriteTokens: 8,
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contextTokens: 200,
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})
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const assistantSeq = session.surface.nodes.at(-1)
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if (assistantSeq === undefined) throw new Error('assistant surface missing')
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session.append('user/message', {
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content: [{ type: 'text', text: 'compact summary' }],
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source: { kind: 'plugin', plugin: 'test' },
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}, {
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surfaceOp: { op: 'replace', start: first.seq, end: assistantSeq },
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sourceEventSeqs: [first.seq, assistantSeq],
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})
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// A replayed usage event for the same step replaces the settled value.
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session.append('assistant/chunk', {
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turn: 1,
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step: 1,
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chunk: {
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type: 'usage',
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usage: {
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inputTokens: 12,
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outputTokens: 4,
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cacheReadTokens: 88,
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cacheWriteTokens: 9,
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},
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},
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})
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const compacted = projector.snapshot(session, attached)
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expect(compacted).toMatchObject({
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uncachedInputTokens: 12,
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outputTokens: 4,
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cacheReadTokens: 88,
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cacheWriteTokens: 9,
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contextTokens: 100,
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})
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assistant(session, 1, 2, {
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inputTokens: 1_000,
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outputTokens: 500,
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cacheReadTokens: 2_000,
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cacheWriteTokens: 3_000,
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})
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const after = projector.snapshot(session, attached)
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expect(after).toMatchObject({
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logRevision: session.events.length,
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projectionRevision: 2,
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uncachedInputTokens: 1_012,
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outputTokens: 504,
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cacheReadTokens: 2_088,
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cacheWriteTokens: 3_009,
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contextTokens: 200,
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})
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expect(after.uncachedInputTokens).not.toBe(
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after.uncachedInputTokens + after.cacheReadTokens + after.cacheWriteTokens,
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)
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})
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it('publishes only the selected route capacity when asynchronous resolutions race', async () => {
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const ctx = new Context()
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const resolutions = new Map<string, (contextWindow: number) => void>()
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ctx.provide('tokenMeter', { measure: () => ({ totalTokens: 35_000 }) })
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ctx.provide('llm', {
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resolveModelInfo(_provider: string, model: string) {
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return new Promise<{ context: { contextWindow: number } }>((resolve) => {
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resolutions.set(model, (contextWindow) => { resolve({ context: { contextWindow } }) })
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})
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},
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})
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const session = new Session(SessionId('capacity-race'))
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const attached = agent(session)
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let current: AgentLlmTarget = { provider: 'test', model: 'alpha' }
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const resolved = vi.fn()
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const projector = new SessionMetricsProjector(ctx, () => current, resolved)
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expect(projector.snapshot(session, attached).contextWindow).toBeUndefined()
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await vi.waitFor(() => { expect(resolutions.has('alpha')).toBe(true) })
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current = { provider: 'test', model: 'beta' }
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expect(projector.snapshot(session, attached).contextWindow).toBeUndefined()
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await vi.waitFor(() => { expect(resolutions.has('beta')).toBe(true) })
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resolutions.get('alpha')?.(64_000)
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await Promise.resolve()
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expect(resolved).not.toHaveBeenCalled()
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resolutions.get('beta')?.(128_000)
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await vi.waitFor(() => { expect(resolved).toHaveBeenCalledOnce() })
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expect(projector.snapshot(session, attached)).toMatchObject({
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contextTokens: 35_000,
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contextWindow: 128_000,
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})
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})
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it('omits current context fields when measurement or model metadata is unavailable', async () => {
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const ctx = new Context()
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ctx.provide('tokenMeter', { measure: () => { throw new Error('unmeasurable') } })
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ctx.provide('llm', { resolveModelInfo: () => Promise.reject(new Error('metadata unavailable')) })
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const session = new Session(SessionId('missing-metrics'))
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const attached = agent(session)
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const projector = new SessionMetricsProjector(
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ctx,
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() => ({ provider: 'test', model: 'missing' }),
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() => {},
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)
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const metrics = projector.snapshot(session, attached)
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expect(metrics.contextTokens).toBeUndefined()
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expect(metrics.contextWindow).toBeUndefined()
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await vi.waitFor(() => {
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expect(projector.snapshot(session, attached).contextWindow).toBeUndefined()
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})
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})
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it('keeps optional usage buckets at zero and tolerates absent host services or detached agents', async () => {
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const ctx = new Context()
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const session = new Session(SessionId('optional-metrics'))
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assistant(session, 1, 0, { inputTokens: 7, outputTokens: 2 })
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const attached = agent(session)
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const projector = new SessionMetricsProjector(
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ctx,
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() => ({ provider: 'test', model: 'no-service' }),
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() => {},
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)
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expect(projector.snapshot(session)).toMatchObject({
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uncachedInputTokens: 7,
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outputTokens: 2,
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cacheReadTokens: 0,
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cacheWriteTokens: 0,
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})
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expect(projector.snapshot(session, attached).contextWindow).toBeUndefined()
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expect(projector.snapshot(session, attached).contextWindow).toBeUndefined()
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await Promise.resolve()
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})
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it('publishes a resolved route with no advertised capacity as unknown', async () => {
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const ctx = new Context()
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ctx.provide('llm', { resolveModelInfo: () => Promise.resolve({}) })
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const session = new Session(SessionId('no-capacity'))
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const attached = agent(session)
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const resolved = vi.fn()
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const projector = new SessionMetricsProjector(
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ctx,
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() => ({ provider: 'test', model: 'metadata-without-context' }),
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resolved,
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)
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expect(projector.snapshot(session, attached).contextWindow).toBeUndefined()
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await vi.waitFor(() => { expect(resolved).toHaveBeenCalledOnce() })
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expect(projector.snapshot(session, attached).contextWindow).toBeUndefined()
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})
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it('ignores stale resolution failures and route metadata after the target moves', async () => {
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const ctx = new Context()
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const resolutions = new Map<string, {
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resolve(value: { context: { contextWindow: number } }): void
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reject(error: Error): void
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}>()
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ctx.provide('llm', {
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resolveModelInfo(_provider: string, model: string) {
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return new Promise<{ context: { contextWindow: number } }>((resolve, reject) => {
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resolutions.set(model, { resolve, reject })
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})
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},
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})
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const session = new Session(SessionId('stale-capacity'))
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const attached = agent(session)
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let current: AgentLlmTarget = { provider: 'test', model: 'alpha' }
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const resolved = vi.fn()
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const targetFor = vi.fn(() => current)
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const projector = new SessionMetricsProjector(ctx, targetFor, resolved)
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projector.snapshot(session, attached)
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await vi.waitFor(() => { expect(resolutions.has('alpha')).toBe(true) })
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current = { provider: 'test', model: 'route-moved-before-snapshot' }
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resolutions.get('alpha')?.resolve({ context: { contextWindow: 64_000 } })
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await vi.waitFor(() => { expect(targetFor).toHaveBeenCalledTimes(2) })
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expect(resolved).not.toHaveBeenCalled()
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projector.snapshot(session, attached)
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await vi.waitFor(() => { expect(resolutions.has('route-moved-before-snapshot')).toBe(true) })
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current = { provider: 'test', model: 'beta' }
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projector.snapshot(session, attached)
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await vi.waitFor(() => { expect(resolutions.has('beta')).toBe(true) })
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resolutions.get('route-moved-before-snapshot')?.reject(new Error('stale failure'))
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await Promise.resolve()
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resolutions.get('beta')?.resolve({ context: { contextWindow: 128_000 } })
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await vi.waitFor(() => { expect(resolved).toHaveBeenCalledOnce() })
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expect(projector.snapshot(session, attached).contextWindow).toBe(128_000)
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})
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})
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