refactor(core): split out instance and route through workspaces (#19335)

packages/opencode/src/server/middleware.ts

@@ -0,0 +1,29 @@
+import { Provider } from "../provider/provider"
+import { NamedError } from "@opencode-ai/util/error"
+import { NotFoundError } from "../storage/db"
+import type { ContentfulStatusCode } from "hono/utils/http-status"
+import type { ErrorHandler } from "hono"
+import { HTTPException } from "hono/http-exception"
+import type { Log } from "../util/log"
+
+export function errorHandler(log: Log.Logger): ErrorHandler {
+  return (err, c) => {
+    log.error("failed", {
+      error: err,
+    })
+    if (err instanceof NamedError) {
+      let status: ContentfulStatusCode
+      if (err instanceof NotFoundError) status = 404
+      else if (err instanceof Provider.ModelNotFoundError) status = 400
+      else if (err.name === "ProviderAuthValidationFailed") status = 400
+      else if (err.name.startsWith("Worktree")) status = 400
+      else status = 500
+      return c.json(err.toObject(), { status })
+    }
+    if (err instanceof HTTPException) return err.getResponse()
+    const message = err instanceof Error && err.stack ? err.stack : err.toString()
+    return c.json(new NamedError.Unknown({ message }).toObject(), {
+      status: 500,
+    })
+  }
+}