feat(core): add session form service (#34855)

packages/core/test/form.test.ts

@@ -0,0 +1,58 @@
+import { describe, expect } from "bun:test"
+import { Effect, Exit } from "effect"
+import { AppNodeBuilder } from "@opencode-ai/core/effect/app-node-builder"
+import { LayerNode } from "@opencode-ai/core/effect/layer-node"
+import { EventV2 } from "@opencode-ai/core/event"
+import { Form } from "@opencode-ai/core/form"
+import { testEffect } from "./lib/effect"
+
+const forms = AppNodeBuilder.build(LayerNode.group([EventV2.node, Form.node]))
+const it = testEffect(forms)
+
+const formID = Form.ID.create("frm_test")
+const input = {
+  id: formID,
+  sessionID: "ses_test",
+  mode: "form",
+  fields: [{ key: "name", type: "string", required: true }],
+} satisfies Form.CreateInput
+
+describe("Form", () => {
+  it.effect("cleans up created forms when event publication fails", () =>
+    Effect.gen(function* () {
+      const service = yield* Form.Service
+      const events = yield* EventV2.Service
+      const unsubscribe = yield* events.listen((event) =>
+        event.type === Form.Event.Created.type ? Effect.die("create listener failed") : Effect.void,
+      )
+      yield* Effect.addFinalizer(() => unsubscribe)
+
+      expect(Exit.isFailure(yield* Effect.exit(service.create(input)))).toBe(true)
+      expect(yield* service.get(formID).pipe(Effect.flip)).toEqual(new Form.NotFoundError({ id: formID }))
+
+      yield* unsubscribe
+      expect(yield* service.create(input)).toMatchObject({ id: formID })
+    }),
+  )
+
+  it.effect("keeps forms pending when reply event publication fails", () =>
+    Effect.gen(function* () {
+      const service = yield* Form.Service
+      const events = yield* EventV2.Service
+      yield* service.create(input)
+      const unsubscribe = yield* events.listen((event) =>
+        event.type === Form.Event.Replied.type ? Effect.die("reply listener failed") : Effect.void,
+      )
+      yield* Effect.addFinalizer(() => unsubscribe)
+
+      expect(
+        Exit.isFailure(yield* Effect.exit(service.reply({ id: formID, answer: { name: "Ava" } }))),
+      ).toBe(true)
+      expect(yield* service.state(formID)).toEqual({ status: "pending" })
+
+      yield* unsubscribe
+      yield* service.reply({ id: formID, answer: { name: "Ava" } })
+      expect(yield* service.state(formID)).toEqual({ status: "answered", answer: { name: "Ava" } })
+    }),
+  )
+})