Chore/consistent services and error handlers (#2101)

* Update index.ts

* Update buildChatflow.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Update index.ts

* Consistency

* Rename ApiError to InternalServerError

* Use InternalFlowiseError in controllers

* Use InternalFlowiseError in services

* Catch routes without preconditioned parameters

* Reconfigure the route precondition checks

* Fix router precondition checks

* cleanup status codes, get proper error messages

---------

Co-authored-by: Henry <hzj94@hotmail.com>

packages/server/src/errors/internalFlowiseError/index.ts

@@ -1,4 +1,4 @@
-export class ApiError extends Error {
+export class InternalFlowiseError extends Error {
     statusCode: number
     constructor(statusCode: number, message: string) {
         super(message)

packages/server/src/errors/utils.ts

@@ -0,0 +1,25 @@
+type ErrorWithMessage = {
+    message: string
+}
+
+const isErrorWithMessage = (error: unknown): error is ErrorWithMessage => {
+    return (
+        typeof error === 'object' && error !== null && 'message' in error && typeof (error as Record<string, unknown>).message === 'string'
+    )
+}
+
+const toErrorWithMessage = (maybeError: unknown): ErrorWithMessage => {
+    if (isErrorWithMessage(maybeError)) return maybeError
+
+    try {
+        return new Error(JSON.stringify(maybeError))
+    } catch {
+        // fallback in case there's an error stringifying the maybeError
+        // like with circular references for example.
+        return new Error(String(maybeError))
+    }
+}
+
+export const getErrorMessage = (error: unknown) => {
+    return toErrorWithMessage(error).message
+}