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import { LayerNode } from "@opencode-ai/core/effect/layer-node"
import { InstanceState } from "@/effect/instance-state"
import { SessionV1 } from "@opencode-ai/core/v1/session"
import { Runner } from "@/effect/runner"
import { BackgroundJob } from "@/background/job"
import { Effect, Latch, Layer, Scope, Context } from "effect"
import { Session } from "./session"
import { SessionID } from "./schema"
import { SessionStatus } from "./status"
export interface Interface {
readonly assertNotBusy: (sessionID: SessionID) => Effect.Effect<void, Session.BusyError>
readonly cancel: (sessionID: SessionID) => Effect.Effect<void>
readonly ensureRunning: (
sessionID: SessionID,
onInterrupt: Effect.Effect<SessionV1.WithParts>,
work: Effect.Effect<SessionV1.WithParts>,
) => Effect.Effect<SessionV1.WithParts>
readonly startShell: (
sessionID: SessionID,
onInterrupt: Effect.Effect<SessionV1.WithParts>,
work: Effect.Effect<SessionV1.WithParts>,
ready?: Latch.Latch,
) => Effect.Effect<SessionV1.WithParts, Session.BusyError>
}
export class Service extends Context.Service<Service, Interface>()("@opencode/SessionRunState") {}
const layer = Layer.effect(
Service,
Effect.gen(function* () {
const background = yield* BackgroundJob.Service
const status = yield* SessionStatus.Service
const state = yield* InstanceState.make(
Effect.fn("SessionRunState.state")(function* () {
const scope = yield* Scope.Scope
const runners = new Map<SessionID, Runner.Runner<SessionV1.WithParts>>()
yield* Effect.addFinalizer(
Effect.fnUntraced(function* () {
yield* Effect.forEach(runners.values(), (runner) => runner.cancel, {
concurrency: "unbounded",
discard: true,
})
runners.clear()
}),
)
return { runners, scope }
}),
)
const runner = Effect.fn("SessionRunState.runner")(function* (
sessionID: SessionID,
onInterrupt: Effect.Effect<SessionV1.WithParts>,
) {
const data = yield* InstanceState.get(state)
const existing = data.runners.get(sessionID)
if (existing) return existing
const next = Runner.make<SessionV1.WithParts>(data.scope, {
onIdle: Effect.gen(function* () {
data.runners.delete(sessionID)
yield* status.set(sessionID, { type: "idle" })
}),
onBusy: status.set(sessionID, { type: "busy" }),
onInterrupt,
})
data.runners.set(sessionID, next)
return next
})
const assertNotBusy = Effect.fn("SessionRunState.assertNotBusy")(function* (sessionID: SessionID) {
const data = yield* InstanceState.get(state)
const existing = data.runners.get(sessionID)
if (existing?.busy) yield* busyError(sessionID)
})
const cancel = Effect.fn("SessionRunState.cancel")(function* (sessionID: SessionID) {
yield* cancelBackgroundJobs(background, sessionID)
const data = yield* InstanceState.get(state)
const existing = data.runners.get(sessionID)
if (!existing) {
yield* status.set(sessionID, { type: "idle" })
return
}
yield* existing.cancel
})
const ensureRunning = Effect.fn("SessionRunState.ensureRunning")(function* (
sessionID: SessionID,
onInterrupt: Effect.Effect<SessionV1.WithParts>,
work: Effect.Effect<SessionV1.WithParts>,
) {
return yield* (yield* runner(sessionID, onInterrupt)).ensureRunning(work)
})
const startShell = Effect.fn("SessionRunState.startShell")(function* (
sessionID: SessionID,
onInterrupt: Effect.Effect<SessionV1.WithParts>,
work: Effect.Effect<SessionV1.WithParts>,
ready?: Latch.Latch,
) {
return yield* (yield* runner(sessionID, onInterrupt))
.startShell(work, ready)
.pipe(Effect.catchTag("RunnerBusy", () => Effect.fail(busyError(sessionID))))
})
return Service.of({ assertNotBusy, cancel, ensureRunning, startShell })
}),
)
const cancelBackgroundJobs = Effect.fn("SessionRunState.cancelBackgroundJobs")(function* (
background: BackgroundJob.Interface,
sessionID: SessionID,
) {
const jobs = yield* background.list()
const pending = new Set<string>([sessionID])
const cancelled = new Set<string>()
const matches = (job: BackgroundJob.Info) => {
if (job.status !== "running") return false
if (cancelled.has(job.id)) return false
if (pending.has(job.id)) return true
if (typeof job.metadata?.sessionId === "string" && pending.has(job.metadata.sessionId)) return true
return typeof job.metadata?.parentSessionId === "string" && pending.has(job.metadata.parentSessionId)
}
let batch = jobs.filter(matches)
while (batch.length > 0) {
yield* Effect.forEach(
batch,
(job) =>
background.cancel(job.id).pipe(
Effect.tap(() =>
Effect.sync(() => {
cancelled.add(job.id)
pending.add(job.id)
if (typeof job.metadata?.sessionId === "string") pending.add(job.metadata.sessionId)
}),
),
),
{ concurrency: "unbounded", discard: true },
)
batch = jobs.filter(matches)
}
})
function busyError(sessionID: SessionID) {
return new Session.BusyError({ sessionID })
}
export const node = LayerNode.make({ service: Service, layer: layer, deps: [BackgroundJob.node, SessionStatus.node] })
export * as SessionRunState from "./run-state"