Tianyi Cui
2be60b9a22
The session event vocabulary carried two standalone trace-only events that
were not load-bearing as separate records. Fold their facts into nearby
load-bearing events and delete the standalone variants.
- Token usage now rides on `assistant/message` as an optional `usage` field —
the assembled model output and its accounting travel together. The loop folds
`assembler.usage` onto the append instead of emitting a separate `usage`
event.
- The max-tokens path is the no-data-loss host: a step cut off with usage but
EMPTY content (e.g. only a dropped tool call) previously emitted a standalone
`usage`; it now records an empty-content `assistant/message { content: [],
usage }`. `deriveMessages()` skips empty-content assistant messages, so the
usage host never injects a spurious content-less assistant turn into the
provider transcript. A step with neither content nor usage appends nothing.
- An operational error's step number now rides on `turn/end.reason` for
`kind: 'error'` (`{ kind: 'error', step, message, code? }`) — the durable
turn outcome ACP and resume already consume. `failTurn` sets the reason
directly (no separate session `error` event). `agent/error` + logging are
unchanged for live diagnostics.
- No format-version bump: pre-release, no persisted data, so per the format
policy there is nothing to migrate or reject (the RFC's "refresh the format
version" criterion over-reached). `version` stays 1.
- ACP fixtures + goldens re-recorded (keyless replay): dropped standalone
usage/error lines, usage folded onto assistant/message, error step on
turn/end.reason.
RFC moved proposed -> implemented with an implementation note recording the two
scope refinements.
429 lines
22 KiB
TypeScript
429 lines
22 KiB
TypeScript
import { describe, expect, it, vi } from 'vitest'
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import { Context } from 'cordis'
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import { CallId } from '@deepseek-ai/dsh-llm'
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import type { Agent } from '@deepseek-ai/dsh-agent'
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import SessionStore, { SessionId } from '@deepseek-ai/dsh-session'
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import * as Invariants from '@deepseek-ai/dsh-invariants'
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import { InvariantError } from '@deepseek-ai/dsh-invariants'
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/** A Context with the session store and the invariants plugin registered. */
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async function setup(config?: { freeze?: boolean }) {
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const ctx = new Context()
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await ctx.plugin(SessionStore)
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const fiber = await ctx.plugin(Invariants, config ?? {})
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return { ctx, fiber }
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}
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/** A minimal Agent stand-in for agent/status emission. */
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function mockAgent(id: string): Agent {
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return { id } as unknown as Agent
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}
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describe('session-log invariants', () => {
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it('accepts a well-formed turn/step/tool sequence', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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expect(() => {
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } })
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session.append('step/start', { turn: 1, step: 1 })
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session.append('assistant/chunk', { turn: 1, step: 1, chunk: { type: 'text-delta', index: 0, text: 'h' } })
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session.append('assistant/message', { turn: 1, step: 1, content: [{ type: 'tool-call', id: CallId('c1'), name: 'echo', arguments: '{}' }] })
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session.append('tool/call', { turn: 1, step: 1, callId: CallId('c1'), name: 'echo', arguments: '{}' })
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session.append('tool/result', { turn: 1, step: 1, callId: CallId('c1'), content: [{ type: 'text', text: 'ok' }], isError: false })
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session.append('step/end', { turn: 1, step: 1 })
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session.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
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}).not.toThrow()
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})
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it('rejects a non-monotonic seq (replay spine)', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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// Session.append enforces seq-contiguity at the source, so drive the
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// invariants seq check directly via session/event with a regressing seq.
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ctx.emit('session/event', session, { type: 'turn/start', seq: 0, time: 1, data: { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } } } as never)
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expect(() => { ctx.emit('session/event', session, { type: 'turn/end', seq: 0, time: 2, data: { turn: 1, reason: { kind: 'completed' } } } as never) })
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.toThrow(/seq must strictly increase/)
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})
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it('rejects a turn/start while another turn is open', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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expect(() => session.append('turn/start', { turn: 2, trigger: { kind: 'message', source: { kind: 'user' } } }))
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.toThrow(/turn 1 is still open/)
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})
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it('rejects a turn/end that does not match the open turn', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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expect(() => session.append('turn/end', { turn: 2, reason: { kind: 'completed' } }))
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.toThrow(/does not match open turn 1/)
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})
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it('rejects a step/start outside its declared turn', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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expect(() => session.append('step/start', { turn: 2, step: 1 })).toThrow(/open turn is 1/)
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})
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it('rejects a step/end that does not match the open step', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('step/start', { turn: 1, step: 1 })
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expect(() => session.append('step/end', { turn: 1, step: 2 })).toThrow(/open is turn 1\/step 1/)
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})
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it('rejects an assistant/chunk outside an open step', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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expect(() => session.append('assistant/chunk', { turn: 1, step: 1, chunk: { type: 'text-delta', index: 0, text: 'x' } }))
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.toThrow(/open is turn 1\/step null/)
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})
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it('rejects a message event appended outside any open turn (turn-enclosure)', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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// No turn open: every message-bearing event must be turn-enclosed (the turn-enclosure RFC).
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expect(() => session.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } }))
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.toThrow(/outside any open turn/)
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expect(() => session.append('context/message', { content: [{ type: 'text', text: 'ctx' }], source: { kind: 'user' } }))
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.toThrow(/outside any open turn/)
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})
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it('rejects steering and plugin-added events appended outside any open turn', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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// steering/message is turn-scoped: outside a turn it would land past the
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// commit boundary and be dropped on resume (the turn-enclosure RFC).
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expect(() => session.append('steering/message', { turn: 1, content: [{ type: 'text', text: 'go' }], source: { kind: 'user' } }))
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.toThrow(/outside any open turn/)
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// A PLUGIN-added (merge-extensible) event type is caught by the default too.
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expect(() => session.append('compaction/marker' as never, { foo: 'bar' } as never))
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.toThrow(/outside any open turn/)
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})
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it('accepts message events once a turn is open', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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expect(() => session.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } }))
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.not.toThrow()
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})
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it('rejects a tool/result with no prior tool/call', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('step/start', { turn: 1, step: 1 })
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expect(() => session.append('tool/result', { turn: 1, step: 1, callId: CallId('ghost'), content: [], isError: false }))
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.toThrow(/no prior tool\/call/)
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})
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it('allows a synthetic interrupted tool/result from crash repair without a prior tool/call event', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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expect(() => {
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('step/start', { turn: 1, step: 1 })
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session.append('assistant/message', { turn: 1, step: 1, content: [
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{ type: 'tool-call', id: CallId('crashed'), name: 'bash', arguments: '{}' },
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] })
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session.append('tool/result', {
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turn: 1,
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step: 1,
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callId: CallId('crashed'),
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content: [{ type: 'text', text: 'interrupted' }],
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isError: true,
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error: { name: 'InterruptedError', code: 'interrupted' },
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})
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session.append('step/end', { turn: 1, step: 1 })
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session.append('turn/end', { turn: 1, reason: { kind: 'interrupted' } })
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}).not.toThrow()
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})
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it('allows a tool/call with no matching tool/result (thrown waterfall ends the step)', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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expect(() => {
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('step/start', { turn: 1, step: 1 })
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session.append('tool/call', { turn: 1, step: 1, callId: CallId('c1'), name: 'echo', arguments: '{}' })
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session.append('step/end', { turn: 1, step: 1 })
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session.append('turn/end', { turn: 1, reason: { kind: 'error', step: 1, message: 'boom' } })
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}).not.toThrow()
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})
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it('holds seeded sessions to the contract on session/created', async () => {
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const { ctx } = await setup({ freeze: false })
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// A seq-contiguous, serializable seed (so it passes Session's constructor
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// validation) that nonetheless violates turn nesting — a second turn/start
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// while the first turn is still open — must be rejected by the invariants
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// plugin when it replays the seed on session/created.
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const badSeed = [
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{ type: 'turn/start' as const, seq: 0, time: 0, data: { turn: 1, trigger: { kind: 'message' as const, source: { kind: 'user' as const } } } },
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{ type: 'turn/start' as const, seq: 1, time: 0, data: { turn: 2, trigger: { kind: 'message' as const, source: { kind: 'user' as const } } } },
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]
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expect(() => ctx.sessions.create(undefined, { seed: badSeed })).toThrow(InvariantError)
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})
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it('tracks turns per session independently', async () => {
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const { ctx } = await setup({ freeze: false })
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const a = ctx.sessions.create(SessionId('a'))
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const b = ctx.sessions.create(SessionId('b'))
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a.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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// b is a fresh session — its own turn/start must not see a's open turn.
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expect(() => b.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })).not.toThrow()
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})
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it('accepts multiple steps in a turn and consecutive turns', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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expect(() => {
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('step/start', { turn: 1, step: 1 })
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session.append('assistant/message', { turn: 1, step: 1, content: [] })
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session.append('step/end', { turn: 1, step: 1 })
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session.append('step/start', { turn: 1, step: 2 })
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session.append('assistant/message', { turn: 1, step: 2, content: [] })
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session.append('step/end', { turn: 1, step: 2 })
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session.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
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session.append('turn/start', { turn: 2, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('turn/end', { turn: 2, reason: { kind: 'completed' } })
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}).not.toThrow()
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})
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it('rejects a skipped turn number', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('turn/end', { turn: 1, reason: { kind: 'completed' } })
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expect(() => session.append('turn/start', { turn: 3, trigger: { kind: 'message', source: { kind: 'user' } } }))
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.toThrow(/expected turn 2, got 3/)
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})
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it('rejects a skipped step number within a turn', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('step/start', { turn: 1, step: 1 })
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session.append('step/end', { turn: 1, step: 1 })
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expect(() => session.append('step/start', { turn: 1, step: 3 }))
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.toThrow(/expected step 2 in turn 1, got 3/)
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})
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it('rejects a turn/end while a step is still open', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('step/start', { turn: 1, step: 1 })
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expect(() => session.append('turn/end', { turn: 1, reason: { kind: 'completed' } }))
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.toThrow(/while step 1 is still open/)
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})
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it('rejects a step/start while a step is still open', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('step/start', { turn: 1, step: 1 })
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expect(() => session.append('step/start', { turn: 1, step: 2 })).toThrow(/while step 1 is still open/)
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})
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it('rejects a tool/result satisfying a call from a previous step', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('step/start', { turn: 1, step: 1 })
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session.append('tool/call', { turn: 1, step: 1, callId: CallId('c1'), name: 'echo', arguments: '{}' })
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// step ends with the call unresolved — pendingCalls is cleared.
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session.append('step/end', { turn: 1, step: 1 })
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session.append('step/start', { turn: 1, step: 2 })
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expect(() => session.append('tool/result', { turn: 1, step: 2, callId: CallId('c1'), content: [], isError: false }))
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.toThrow(/no prior tool\/call in this step/)
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})
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it('rejects an assistant/message naming the wrong step', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('step/start', { turn: 1, step: 1 })
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expect(() => session.append('assistant/message', { turn: 1, step: 2, content: [] }))
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.toThrow(/open is turn 1\/step 1/)
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})
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})
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describe('HMR state rebuild', () => {
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it('rebuilds trace state for a session that exists at (re-)apply time', async () => {
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const ctx = new Context()
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await ctx.plugin(SessionStore)
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// First registration, mid-turn: a turn is open when the plugin reloads.
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const first = await ctx.plugin(Invariants, { freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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session.append('step/start', { turn: 1, step: 1 })
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await first.dispose()
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// Re-apply (HMR): the fresh fiber must replay the existing log so the open
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// step is known — the next chunk must NOT be a false positive.
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await ctx.plugin(Invariants, { freeze: false })
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expect(() => session.append('assistant/chunk', { turn: 1, step: 1, chunk: { type: 'text-delta', index: 0, text: 'h' } }))
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.not.toThrow()
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// And a genuine violation is still caught after the rebuild.
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expect(() => session.append('turn/start', { turn: 2, trigger: { kind: 'message', source: { kind: 'user' } } }))
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.toThrow(/turn 1 is still open/)
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})
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})
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describe('dev-freeze', () => {
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it('freezes appended event data so mutating a logged event throws', async () => {
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const { ctx } = await setup() // freeze defaults true
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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const event = session.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } })
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expect(Object.isFrozen(event)).toBe(true)
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expect(Object.isFrozen(event.data)).toBe(true)
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expect(Object.isFrozen(event.data.content)).toBe(true)
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expect(() => { (event.data.content[0] as { text: string }).text = 'HACKED' }).toThrow()
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})
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it('does not freeze when freeze:false', async () => {
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const { ctx } = await setup({ freeze: false })
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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const event = session.append('user/message', { content: [{ type: 'text', text: 'hi' }], source: { kind: 'user' } })
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expect(Object.isFrozen(event)).toBe(false)
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})
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it('freezes seeded events on session/created', async () => {
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const { ctx } = await setup()
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const seed = [
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{ type: 'turn/start' as const, seq: 0, time: 0, data: { turn: 1, trigger: { kind: 'message' as const, source: { kind: 'user' as const } } } },
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{ type: 'user/message' as const, seq: 1, time: 0, data: { content: [{ type: 'text' as const, text: 'seeded' }], source: { kind: 'user' as const } } },
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]
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const session = ctx.sessions.create(undefined, { seed })
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expect(Object.isFrozen(session.events[0])).toBe(true)
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})
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it('freezes mutable descendants of a shallow-frozen event datum', async () => {
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const { ctx } = await setup()
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const session = ctx.sessions.create()
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session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
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// A caller hands in a SHALLOW-frozen block whose nested array is still
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// mutable. deepFreeze must descend into the already-frozen object and
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// freeze the descendant, not short-circuit on the frozen container —
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// otherwise dev-mode misses exactly the history mutation the dev-invariants RFC catches.
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// `append` snapshots `data`, so the freeze applies to the LOGGED clone, not
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// the caller's input — read the event back and assert on its data.
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const innerContent: { type: 'text'; text: string }[] = [{ type: 'text', text: 'inner' }]
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const block = Object.freeze({ type: 'tool-result' as const, toolCallId: CallId('c1'), content: innerContent, isError: false })
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const event = session.append('user/message', { content: [block], source: { kind: 'user' } })
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const logged = event.data.content[0] as { content: { type: 'text'; text: string }[] }
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expect(Object.isFrozen(logged.content)).toBe(true)
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expect(Object.isFrozen(logged.content[0])).toBe(true)
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expect(() => { logged.content.push({ type: 'text', text: 'mutation' }) }).toThrow()
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})
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it('terminates on a cyclic event datum (WeakSet guard)', async () => {
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const { ctx } = await setup()
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|
const session = ctx.sessions.create()
|
|
// The deep-freeze WeakSet guard must terminate on a self-referential
|
|
// structure rather than recursing forever. Session.append now rejects
|
|
// non-serializable (incl. cyclic) data at the source, so drive the freeze
|
|
// handler directly via hand-built session/events — exactly the shape the
|
|
// invariants listener receives. Open a turn first (seq 0) so the cyclic
|
|
// user/message (seq 1) satisfies the turn-enclosure invariant.
|
|
ctx.emit('session/event', session, { type: 'turn/start', seq: 0, time: 1, data: { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } } } as never)
|
|
const cyclic: Record<string, unknown> = { type: 'text', text: 'x' }
|
|
cyclic['self'] = cyclic
|
|
const event = { type: 'user/message', seq: 1, time: 1, data: { content: [cyclic], source: { kind: 'user' } } }
|
|
expect(() => { ctx.emit('session/event', session, event as never) }).not.toThrow()
|
|
expect(Object.isFrozen(cyclic)).toBe(true)
|
|
})
|
|
})
|
|
|
|
describe('agent status invariants', () => {
|
|
it('accepts legal transitions: idle→running→idle and →disposed', async () => {
|
|
const { ctx } = await setup({ freeze: false })
|
|
const agent = mockAgent('a1')
|
|
expect(() => {
|
|
ctx.emit('agent/status', agent, 'idle')
|
|
ctx.emit('agent/status', agent, 'running')
|
|
ctx.emit('agent/status', agent, 'idle')
|
|
ctx.emit('agent/status', agent, 'disposed')
|
|
}).not.toThrow()
|
|
})
|
|
|
|
it('accepts running→disposed', async () => {
|
|
const { ctx } = await setup({ freeze: false })
|
|
const agent = mockAgent('a2')
|
|
ctx.emit('agent/status', agent, 'running')
|
|
expect(() => { ctx.emit('agent/status', agent, 'disposed') }).not.toThrow()
|
|
})
|
|
|
|
it('rejects a no-op transition', async () => {
|
|
const { ctx } = await setup({ freeze: false })
|
|
const agent = mockAgent('a3')
|
|
ctx.emit('agent/status', agent, 'running')
|
|
expect(() => { ctx.emit('agent/status', agent, 'running') }).toThrow(/no-op transition/)
|
|
})
|
|
|
|
it('rejects leaving the terminal disposed state', async () => {
|
|
const { ctx } = await setup({ freeze: false })
|
|
const agent = mockAgent('a4')
|
|
ctx.emit('agent/status', agent, 'disposed')
|
|
expect(() => { ctx.emit('agent/status', agent, 'idle') }).toThrow(/left terminal state disposed/)
|
|
})
|
|
|
|
it('tracks status per agent independently', async () => {
|
|
const { ctx } = await setup({ freeze: false })
|
|
const a = mockAgent('a5')
|
|
const b = mockAgent('b5')
|
|
ctx.emit('agent/status', a, 'running')
|
|
// b's first observation is independent of a.
|
|
expect(() => { ctx.emit('agent/status', b, 'running') }).not.toThrow()
|
|
})
|
|
})
|
|
|
|
describe('HMR safety', () => {
|
|
it('removes all listeners when the plugin fiber is disposed', async () => {
|
|
const { ctx, fiber } = await setup()
|
|
const session = ctx.sessions.create()
|
|
session.append('turn/start', { turn: 1, trigger: { kind: 'message', source: { kind: 'user' } } })
|
|
|
|
await fiber.dispose()
|
|
|
|
// After disposal: no freezing, no assertions. An event that WOULD have
|
|
// violated the open-turn rule now passes silently, and is not frozen.
|
|
const event = session.append('turn/start', { turn: 2, trigger: { kind: 'message', source: { kind: 'user' } } })
|
|
expect(Object.isFrozen(event)).toBe(false)
|
|
// A no-op status transition no longer throws either.
|
|
const agent = mockAgent('hmr')
|
|
ctx.emit('agent/status', agent, 'idle')
|
|
expect(() => { ctx.emit('agent/status', agent, 'idle') }).not.toThrow()
|
|
})
|
|
|
|
it('InvariantError carries a stable code', () => {
|
|
const err = new InvariantError('seq must strictly increase')
|
|
expect(err).toBeInstanceOf(Error)
|
|
expect(err.name).toBe('InvariantError')
|
|
expect(err.code).toBe('INVARIANT')
|
|
expect(err.message).toBe('invariant violated: seq must strictly increase')
|
|
})
|
|
|
|
it('does not leak listeners across dispose (no stale freezing)', async () => {
|
|
const { ctx, fiber } = await setup()
|
|
await fiber.dispose()
|
|
const spy = vi.fn()
|
|
ctx.on('session/event', spy)
|
|
const session = ctx.sessions.create()
|
|
session.append('user/message', { content: [{ type: 'text', text: 'x' }], source: { kind: 'user' } })
|
|
// our own spy fires, proving events still flow — but the plugin's frozen.
|
|
expect(spy).toHaveBeenCalledOnce()
|
|
expect(Object.isFrozen(session.events[0])).toBe(false)
|
|
})
|
|
})
|