Tianyi Cui
df4b7d3d9a
Add the durable session-persistence capability seam (ADR 0016): an
abstract SessionPersistence service (dsh-session-persistence,
ctx.sessionPersistence) defining create/append/load/list/has/delete/
update over the existing SessionEvent — no parallel persisted type — and
a first implementation (dsh-session-persistence-jsonl): an append-only
JSONL log per session with crash-safe atomic writes, truncation-repair
of a never-committed crash tail, and a read/replay path. SessionMeta
(format version, cwd, lineage) travels out-of-log via session.header.
A shared runPersistenceContract suite holds every backend to the same
append-only / contiguous-seq / lazy-materialization / serializability
semantics.
Config-driven create() now uses a per-run ${id}-session-<uuid> session
id so a fixed name no longer collides with an on-disk log once a durable
backend is loaded; each run is a new session (a demo simplification). The
examples drop their hand-rolled session-jsonl.ts and load the JSONL
backend via cordis.yml; CI smoke-loads it too.
The agent-facing create/resume factory that consumes load() is a
separate seam, deferred to a follow-up; this change stops at the load
primitive and does not reach into the loop.
96 lines
3.4 KiB
TypeScript
96 lines
3.4 KiB
TypeScript
/**
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* THE concrete agent plugin: creates LoopAgents, runs their loops, and
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* registers them in ctx.agents. Deliberately thin — every behavior beyond
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* "call the model, run the tools, repeat" belongs to plugins on the event
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* taxonomy.
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*
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* @module @deepseek-ai/dsh-agent-loop
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*/
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import { Context, Service } from 'cordis'
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import { randomUUID } from 'node:crypto'
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import z from 'schemastery'
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import { AgentId } from '@deepseek-ai/dsh-agent'
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import type { AgentOptions } from '@deepseek-ai/dsh-agent'
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import type {} from '@deepseek-ai/dsh-llm'
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import type {} from '@deepseek-ai/dsh-session'
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import type {} from '@deepseek-ai/dsh-system-prompt'
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import type {} from '@deepseek-ai/dsh-tools'
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import { LoopAgent } from './agent.ts'
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export { LoopAgent } from './agent.ts'
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export { Inbox, type InboxMessage } from './inbox.ts'
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export { runLoop } from './loop.ts'
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declare module 'cordis' {
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interface Context {
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agentLoop: AgentLoop
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}
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}
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export interface Config {
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/** Agents created from configuration at startup. */
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agents: (AgentOptions & { id: string })[]
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}
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/**
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* The agent-loop plugin (`ctx.agentLoop`): creates {@link LoopAgent}s, runs
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* their loops, and registers them in `ctx.agents`.
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*
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* The loop itself is deliberately thin — every behavior beyond "call the
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* model, run the tools, repeat" belongs to plugins listening on the event
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* taxonomy declared in @deepseek-ai/dsh-agent.
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*/
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export class AgentLoop extends Service {
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static inject = ['agents', 'sessions', 'llm', 'tools', 'systemPrompt']
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static Config: z<Config> = z.object({
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agents: z.array(z.object({
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id: z.string().required(),
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model: z.string(),
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systemPrompt: z.string(),
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})).default([]),
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})
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constructor(ctx: Context, public config: Config) {
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super(ctx, 'agentLoop')
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for (const { id, ...options } of config.agents) {
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this.create(id, options)
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}
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}
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/**
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* Create an agent, start its loop, and register it. Returns the agent.
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* Disposed with the calling fiber.
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*
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* The session id is per-run (`${id}-session-<uuid>`, no fixed name): once a
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* durable persistence backend is loaded, a fixed `${id}-session` collides on
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* the second run — the backend refuses to re-create an id whose log already
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* exists on disk (the SessionId is the identity). A fresh id means each run
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* is a new session.
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*
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* TODO(demo): each run starting a brand-new session is fine for demos but is
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* NOT real conversation continuity. A production config-driven agent needs a
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* deliberate resume-or-create policy (resume the prior session if one exists,
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* else start fresh) or an explicit caller-chosen session id — revisit when the
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* UI/ACP path owns session selection.
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*
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* TODO(sub-agents): spawn/fork land here — accept a parent agent reference;
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* fork seeds the new Session with the parent's event log, spawn starts
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* fresh; the child is returned as a regular Agent handle.
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*/
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create(id: string, options: AgentOptions = {}): LoopAgent {
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const session = this.ctx.sessions.create(`${id}-session-${randomUUID()}`, { meta: {} })
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const agent = new LoopAgent(this.ctx, AgentId(id), options, session)
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// Generator effect: stop and unregister are independent disposables
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// (LIFO), so a throwing stop() cannot leak the registry entry.
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this.ctx.effect(function* (this: AgentLoop) {
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yield this.ctx.agents.register(agent)
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yield agent.start()
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}.bind(this), 'agentLoop.create()')
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return agent
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}
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}
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export default AgentLoop
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