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/services/flow-configs/index.ts

@@ -1,18 +1,17 @@
+import { StatusCodes } from 'http-status-codes'
 import { findAvailableConfigs } from '../../utils'
 import { IReactFlowObject } from '../../Interface'
 import { getRunningExpressApp } from '../../utils/getRunningExpressApp'
 import chatflowsService from '../chatflows'
+import { InternalFlowiseError } from '../../errors/internalFlowiseError'
+import { getErrorMessage } from '../../errors/utils'
 
 const getSingleFlowConfig = async (chatflowId: string): Promise<any> => {
     try {
         const appServer = getRunningExpressApp()
         const chatflow = await chatflowsService.getChatflowById(chatflowId)
         if (!chatflow) {
-            return {
-                executionError: true,
-                status: 404,
-                msg: `Chatflow ${chatflowId} not found in the database!`
-            }
+            throw new InternalFlowiseError(StatusCodes.NOT_FOUND, `Chatflow ${chatflowId} not found in the database!`)
         }
         const flowData = chatflow.flowData
         const parsedFlowData: IReactFlowObject = JSON.parse(flowData)
@@ -20,7 +19,10 @@ const getSingleFlowConfig = async (chatflowId: string): Promise<any> => {
         const dbResponse = findAvailableConfigs(nodes, appServer.nodesPool.componentCredentials)
         return dbResponse
     } catch (error) {
-        throw new Error(`Error: flowConfigService.getSingleFlowConfig - ${error}`)
+        throw new InternalFlowiseError(
+            StatusCodes.INTERNAL_SERVER_ERROR,
+            `Error: flowConfigService.getSingleFlowConfig - ${getErrorMessage(error)}`
+        )
     }
 }