effect(server): typed errors in session/sync handlers, fix concurrency (#27146)

packages/opencode/src/server/routes/instance/httpapi/handlers/instance.ts

@@ -38,7 +38,9 @@ export const instanceHandlers = HttpApiBuilder.group(InstanceHttpApi, "instance"
     })
 
     const getVcs = Effect.fn("InstanceHttpApi.vcs")(function* () {
-      const [branch, default_branch] = yield* Effect.all([vcs.branch(), vcs.defaultBranch()], { concurrency: 2 })
+      const [branch, default_branch] = yield* Effect.all([vcs.branch(), vcs.defaultBranch()], {
+        concurrency: "unbounded",
+      })
       return { branch, default_branch }
     })
 

packages/opencode/src/server/routes/instance/httpapi/handlers/session.ts

@@ -36,6 +36,12 @@ import {
 } from "../groups/session"
 import * as SessionError from "./session-errors"
 
+const tryParseJson = (text: string) =>
+  Effect.try({
+    try: () => JSON.parse(text) as unknown,
+    catch: () => new HttpApiError.BadRequest({}),
+  })
+
 export const sessionHandlers = HttpApiBuilder.group(InstanceHttpApi, "session", (handlers) =>
   Effect.gen(function* () {
     const session = yield* Session.Service
@@ -160,10 +166,7 @@ export const sessionHandlers = HttpApiBuilder.group(InstanceHttpApi, "session",
       const body = yield* Effect.orDie(ctx.request.text)
       if (body.trim().length === 0) return yield* create({})
 
-      const json = yield* Effect.try({
-        try: () => JSON.parse(body) as unknown,
-        catch: () => new HttpApiError.BadRequest({}),
-      })
+      const json = yield* tryParseJson(body)
       const payload = yield* Schema.decodeUnknownEffect(Session.CreateInput)(json).pipe(
         Effect.mapError(() => new HttpApiError.BadRequest({})),
       )
@@ -211,10 +214,7 @@ export const sessionHandlers = HttpApiBuilder.group(InstanceHttpApi, "session",
       const body = yield* Effect.orDie(ctx.request.text)
       if (body.trim().length === 0) return yield* fork({ params: ctx.params })
 
-      const json = yield* Effect.try({
-        try: () => JSON.parse(body) as unknown,
-        catch: () => new HttpApiError.BadRequest({}),
-      })
+      const json = yield* tryParseJson(body)
       const payload = yield* Schema.decodeUnknownEffect(ForkPayload)(json).pipe(
         Effect.mapError(() => new HttpApiError.BadRequest({})),
       )

packages/opencode/src/server/routes/instance/httpapi/handlers/sync.ts

@@ -11,7 +11,7 @@ import { lte } from "drizzle-orm"
 import { not } from "drizzle-orm"
 import { or } from "drizzle-orm"
 import { Effect, Scope } from "effect"
-import { HttpApiBuilder } from "effect/unstable/httpapi"
+import { HttpApiBuilder, HttpApiError } from "effect/unstable/httpapi"
 import { InstanceHttpApi } from "../api"
 import { HistoryPayload, ReplayPayload, SessionPayload } from "../groups/sync"
 import * as Log from "@opencode-ai/core/util/log"
@@ -59,7 +59,7 @@ export const syncHandlers = HttpApiBuilder.group(InstanceHttpApi, "sync", (handl
 
     const steal = Effect.fn("SyncHttpApi.steal")(function* (ctx: { payload: typeof SessionPayload.Type }) {
       const workspaceID = yield* InstanceState.workspaceID
-      if (!workspaceID) throw new Error("Cannot steal session without workspace context")
+      if (!workspaceID) return yield* new HttpApiError.BadRequest({})
 
       yield* sync.run(Session.Event.Updated, {
         sessionID: ctx.payload.sessionID,