Discussion Forum Middleware Error Codes

Introduction

This document describes how to construct Error codes for all operations

Background

Jira Issues

https://project-sunbird.atlassian.net/browse/SB-21578

Examples Of Error code

PFT_CCRT10  >> PBK_CCRT10  >> DMW_CCRT10  >> NBB_CCRT10 

TraceId: 1234 
Error happened at NodeBB end. 
NBB_CCRT10 << NBB_CCRT10  << NBB_CCRT10 << NBB_CCRT10 

===> Servies: 
Discussion Middleware service -> DMW 
NodeBB Sercie -> NBB 

===> Operations: 
Category create - CCRT 
Topic create    - TCRT 
Group create    - GCRT 
Usr create      - UCRT 

===> ERROR CODES: 
01 - Category creation failed because of reason 1? 
02 - Category create failed because of reason 2? 
03 - Category update failed because of reason 1? 
04 - Category update failed because of reason 2? 
... 
DMW_CCRT01 
NBB_GCRT{error_code}

Problem Statement:

How to assign specific error code to api?

Solution:

API	Unique Operation Name	Operation Name	Error Number	Error Description	Error Code	API errors- Revised	User Interface error
FORUM API's
/forum/v2/read	FRED	DMW_FRED	01	Forum read failed because of nodebb-plugin-create-forum plugin not enabled.	DMW_FRED01	The nodebb plug-in or the API is not available. Contact your system administrator to enable it.	Could not read Forum. Try again later.
/forum/v2/read	FRED	DMW_FRED	02	Forum read failed because of request payload issue	DMW_FRED02	Mandatory fields are missing in the request. Enter the required values and resend the request.	Could not read Forum. Try again later.
/forum/v2/read	FRED	DMW_FRED	03	Forum read failed	DMW_FRED03	Forum read failed due to internal server error or database issues. Try again later.	Could not read Forum. Try again later.
/forum/v2/create	FCRT	DMW_FCRT	04	Forum create failed because nodebb-plugin-create-forum not enabled.	DMW_FCRT04	Forum creation failed as the nodebb plug-in or the API is not available. Contact your system administrator to enable it.	Could not create Forum. Contact your system administrator.
/forum/v2/create		DMW_FCRT	05	Forum create failed because of request payload issue.	DMW_FCRT05	Forum creation failed, mandatory fields are missing in the request. Enter the required values and resend the request.	Could not create forum, re-enter the values and try again.
/forum/v2/create		DMW_FCRT	06	Forum create failed	DMW_FCRT06	Forum creation failed due to internal server error or database issues. Try again later.	Could not create forum, try again later.
/forum/v2/remove	FREM	DMW_FREM	07	Forum remove failed because nodebb-plugin-create-forum not enabled.	DMW_FREM07	Removing forum failed, the nodebb plug-in or the API is not available. Contact your system administrator to enable it.	Could not remove forum. Contact your system administrator
/forum/v2/remove		DMW_FREM	08	Forum remove failed	DMW_FREM08	Removing forum failed as mandatory fields are missing in the request. Enter the required values and resend the request.	Could not remove forum. Try again later.
/forum/v2/remove		DMW_FREM	09	Forum remove failed because of request pay is incorrect	DMW_FREM09	Removing Forum failed due to internal server error or database issues. Try again later.	Could not remove forum. Try again later.
Tags API
/tags	TRED	DMW_TRED	01	Tags read failed	DMW_TRED01	Reading tags failed due to internal server error or database issues. Try again later.	Could not read tags. Try again later
/tags/list	TLST	DMW_TLST	02	Tags list read failed	DMW_TLST02	Reading tags failed due to internal server error or database issues. Try again later.	Could not read tags. Try again later
/tags/:tag	TRDIS	DMW_TRDIS	03	Tag details read failed	DMW_TRDIS03	Reading tags failed due to internal server error or database issues. Try again later.	Could not read tags. Try again later.
/tags/list	TLSL	DMW_TLST	04	Tag list failed because nodebb-plugin-create-forum not enabled.	DMW_TLST04	Tag list failed as, the nodebb plug-in or the API is not available. Contact your system administrator to enable it.	Could not read tags. Try again later.
/tags/list	TSLS	DMW_TLST	05	Tag list failed because of request payload is incorrect	DMW_TLST05	Tag list failed as mandatory fields are missing in the request. Enter the required values and resend the request.	Could not read tags. Try again later.
USER DETAILS API's
/user/:userslug	URED	DMW_URED	01	User details read failed	DMW_URED01	Failed to read user details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not read user details. Try again later.
/user/:userslug		DMW_URED	02	Users details read failed because of user not exists	DMW_URED02	Failed to read user details, user does not exists. Contact your system administrator.	User does not exists. Contact your system administrator.
/user/:userslug/upvoted	UUVR	DMW_URED	03	User up vote post details read failed	DMW_UUVR03	Failed to read user up-vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not read up vote post. Try again later.
/user/:userslug/upvoted		DMW_URED	04	User up vote post details read failed because of user not exists	DMW_UUVR04	Failed to read user up-vote post details, user does not exist. Contact your system administrator.	Could not read up vote post as user does not exists. Contact your system administrator.
/user/:userslug/downvoted	UDVR	DMW_URED	05	User down vote post details read failed	DMW_UDVR05	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not read down vote post. Try again later.
/user/:userslug/downvoted		DMW_URED	06	User down vote post details read failed because of user not exists.	DMW_UDVR06	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not read down vote post as user does not exists. Contact your system administrator.
/user/:userslug/bookmarks	UBMR	DMW_URED	07	User saved post details read failed	DMW_UBMR07	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not read saved post. Try again later.
/user/:userslug/bookmarks		DMW_URED	08	User saved post details read failed because of user not exists	DMW_UBMR08	Failed to read user saved post details as user does not exist. Contact your system administrator.	Could not read saved post as user does not exists. Contact your system administrator.
/user/v1/create	UCRT	DMW_UCRT	09	Create user failed	DMW_UCRT09	Failed to create user, there may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/user/v1/create		DMW_UCRT	10	Create user failed because of nodebb-plugin-sunbird-oidc plugin not enable	DMW_UCRT10	Failed to create user, the nodebb plug-in or the API is not available. Contact your system administrator to enable it.	Could not create user. Try again later.
CATEGORY API's
/category/:category_id/:slug	CDTL	DMW_CRED	01	Category details read failed.	DMW_CDTL01	Failed to read category details, there may be a network error or there are too many concurrent calls to the server. Try again later.	Could not read category details. Try again later.
/category/:category_id/:slug		DMW_CRED	02	Category details read failed because of category id not exists.	DMW_CDTL02	Failed to read category details, as category ID does not exists. Contact your system administrator.	Could not read category details. Try again later.
/category/:cid	CRED	DMW_CRED	03	Category details read by cid failed	DMW_CRED03	Failed to read category cid details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not read category details. Try again later.
/category/:cid		DMW_CRED	04	Category details read by cid failed because of cid not exists.	DMW_CRED04	Failed to read category as cid details does not exists. Contact your system administrator to enable it.	Could not read category details. Try again later.
/categories	CLST	DMW_CRED	05	Access list of categories failed.	DMW_CLST05	Failed to access category list. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not access category list. Try again later.
/v2/categories	CCRT	DMW_CCRT	06	Create category failed	DMW_CCRT06	Failed to create category. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create category. Try again later.
/v2/categories		DMW_CCRT	07	Create category failed because of nodebb-plugin-write-api not enable.	DMW_CCRT07	Failed to create category as nodebb-plugin write API is not enabled. Contact your system administrator.	Could not create category. Try again later.
/v2/categories		DMW_CCRT	08	Create category failed because of you are not authorized	DMW_CCRT08	Failed to create category, unauthorised user. Contact your system administrator.	Could not create category. Try again later.
/v2/categories		DMW_CCRT	09	Create category failed because of request payload is incorrect.	DMW_CCRT09	Failed to create category, mandatory fields are missing in the request. Enter the required values and resend the request.	Could not create category. Try again later.
/v2/categories/:cid(PUT)	CUDT	DMW_CUDT	10	Update category failed	DMW_CUDT10	Failed to update category, there may be a network error or there are too many concurrent calls to the server. Try again later.	Could not update category. Try again later.
/v2/categories/:cid(PUT)		DMW_CUDT	11	Update category failed because of nodebb-plugin-write-api not enable or cid not exists.	DMW_CUDT11	Failed to update category as nodebb-plugin write API is not enabled or cid does not exists. Contact your system administrator to enable it.	Could not update category. Try again later.
/v2/categories/:cid(PUT)		DMW_CUDT	12	Update category failed because of you are not authorized	DMW_CUDT12	Failed to update category, unauthorised user. Contact your system administrator.	Could not update category, unautorised user. Contact your system administrator.
/v2/categories/:cid(PUT)		DMW_CUDT	13	Update category failed because of request payload is incorrect.	DMW_CUDT13	Failed to update category, mandatory fields are missing in the request. Enter the required values and resend the request.	Could not update category. Try again later.
/v2/categories/:cid(DELETE)	CDEL	DMW_CDEL	14	Delete category failed	DMW_CDEL14	Failed to delete category. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not delete category. Try again later.
/v2/categories/:cid(DELETE)		DMW_CDEL	15	Delete category failed because of nodebb-plugin-write-api not enable or cid not exists.	DMW_CDEL15	Failed to delete category as nodebb-plugin write API is not enabled or cid does not exists. Contact your system administrator to enable it.	Could not delete category. Try again later.
/v2/categories/:cid(DELETE)			16	Delete category failed because of you are not authorized	DMW_CDEL16	Failed to delete category, unauthorised user. Contact your system administrator.	Could not delete category. Try again later.
/category/list	CLST	DMW_CLST	17	Category list api failed	DMW_CLST17	Failed to read category list API. The plugin might not be enabled for your instance. Contact your system administrator to enable it.	Could not read category list. Try again later.
/category/list	CLST	DMW_CLST	18	Category id not found, Use correct cid.	DMW_CLST18	Failed to read category as cid details does not exists. Contact your system administrator to enable it.	Could not read category. Try again later.
TOPICS API's
/unread	TUNR	DMW_TRED	01	Access unread topics failed	DMW_TUNR01	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/recent	TRCT	DMW_TRED	02	Access recent topics failed.	DMW_TRCT02	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/topic/:topic_id/:slug	TDTL	DMW_TRED	03	Access topic details failed	DMW_TDTL03	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/topic/:topic_id/:slug		DMW_TRED	04	Access topic details failed because of topic id is not exists	DMW_TDTL04	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/topics	TCRT	DMW_TCRT	05	Create topic failed	DMW_TCRT05	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/v2/topics		DMW_TCRT	06	Create topic failed because of nodebb-plugin-write-api plugin not enabled.	DMW_TCRT06	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/topics		DMW_TCRT	07	Create topic failed because of you are not authorized.	DMW_TCRT07		Could not create user. Try again later.
/v2/topics		DMW_TCRT	08	Create topic failed because of request payload is incorrect.	DMW_TCRT08		Could not create user. Try again later.
/v2/topics/:tid(POST)	RCRT	DMW_RCRT	09	Add reply failed	DMW_RCRT09	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/topics/:tid(POST)		DMW_RCRT	10	Add reply failed because f nodebb-plugin-write-api is not enabled or tid not exists	DMW_RCRT10	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/v2/topics/:tid(POST)		DMW_RCRT	11	Add reply failed because you are not authorized	DMW_RCRT11	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/topics/:tid(POST)		DMW_RCRT	12	Add reply failed because of request payload is incorrect.	DMW_RCRT12	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/topics/:tid(PUT)	TUDT	DMW_TUDT	13	Update topics/reply failed	DMW_TUDT13	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/v2/topics/:tid(PUT)		DMW_TUDT	14	Update topics/reply failed because of nodebb-plugin-write-api is not enabled or tid not exists.	DMW_TUDT14	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/topics/:tid(PUT)		DMW_TUDT	15	Update topics/reply failed because of you are not authorized	DMW_TUDT15	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/topics/:tid(PUT)		DMW_TUDT	16	Update topics/reply failed because of request payload is incorrect.	DMW_TUDT16	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/v2/topics/:tid(DELETE)	TDEL	DMW_TDEL	17	Delete topic/reply failed	DMW_TDEL17	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/topics/:tid(DELETE)		DMW_TDEL	18	Delete topic/reply failed because of nodebb-plugin-write-api is not enabled or tid not exists	DMW_TDEL18	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/topics/:tid(DELETE)		DMW_TDEL	19	Delete topic/reply failed because of you are not authorized	DMW_TDEL19	Failed to delete topic details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/v2/topics/:tid(DELETE)		DMW_TDEL	20	Delete topic/reply failed because of tid is not exists.	DMW_TDEL20	Failed to delete topic/reply. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
POST API's
/post/pid/:pid	PRED	DWM_PRED	01	Access post details failed	DWM_PRED01	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/post/pid/:pid		DWM_PRED	02	Access post details failed because of pid is not exists	DWM_PRED02	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/v2/posts/:pid(POST)	PCRT	DMW_PCRT	03	Create post failed	DMW_PCRT03	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid(POST)		DMW_PCRT	04	Create post failed because of nodebb-plugin-write-api is not enabled or pid not exists	DMW_PCRT04	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid(POST)		DMW_PCRT	05	Create post failed because of you are not authorized	DMW_PCRT05	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/v2/posts/:pid(POST)		DMW_PCRT	06	Create post failed because of request payload is incorrect	DMW_PCRT06	Failed to create post . There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid(DELETE)	PDEL	DWM_PDEL	07	Delete post failed	DWM_PDEL07	Failed to delete post. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid(DELETE)		DWM_PDEL	08	Delete post failed because of nodebb-plugin-write-api is not enabled or pid not exists	DWM_PDEL08	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/v2/posts/:pid(DELETE)		DWM_PDEL	09	Delete post failed because of you are not authorized	DWM_PDEL09	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid(DELETE)		DWM_PDEL	10	Delete post failed because of pid is not exists	DWM_PDEL10	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid/vote(POST)	PVOT	DMW_PCRT	11	Adding vote to a post failed	DMW_PVOT11	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/v2/posts/:pid/vote(POST)		DMW_PCRT	12	Adding vote to a post failed because of nodebb-plugin-write-api is not enabled or pid not exists	DMW_PVOT12	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid/vote(POST)		DMW_PCRT	13	Adding vote to a post failed because of you are not authorized	DMW_PVOT13	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid/vote(POST)		DMW_PCRT	14	Adding vote to a post failed because of request payload is incorrect	DMW_PVOT14	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/v2/posts/:pid/vote(DELETE)	PVDL	DMW_PCRT	15	Deleting vote failed	DMW_PVDL15	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid/vote(DELETE)		DMW_PCRT	16	Deleting vote failed because of nodebb-plugin-write-api is not enabled or pid not exists	DMW_PVDL16	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid/vote(DELETE)		DMW_PCRT	17	Deleting vote failed because of you are not authorized	DMW_PVDL17	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/v2/posts/:pid/vote(DELETE)		DMW_PCRT	18	Deleting vote failed because of pid is incorrect	DMW_PVDL18	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid/bookmark(POST)	PSVE	DMW_PCRT	19	Bookmark post failed	DMW_PSVE19	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid/bookmark(POST)	PSVE	DMW_PCRT	20	Bookmark post failed because of nodebb-plugin-write-api not enabled or pid not exists	DMW_PSVE20	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/v2/posts/:pid/bookmark(POST)	PSVE	DMW_PCRT	21	Bookmark post failed because of you are not authorized	DMW_PSVE21	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid/bookmark(POST)	PSVE	DMW_PCRT	22	Bookmark post failed because of pid is incorrect	DMW_PSVE22	Failed to read user down vote post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid/bookmark(DELETE)	PUSVE	DMW_PCRT	23	Delete bookmark failed	DMW_PUSVE23	Failed to read user down vote post details as user does not exist. Contact your system administrator.	Could not create user. Try again later.
/v2/posts/:pid/bookmark(DELETE)	PUSVE	DMW_PCRT	24	Delete bookmark failed because of nodebb-plugin-write-api is not enabled or pid incorrect.	DMW_PUSVE24	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid/bookmark(DELETE)	PUSVE	DMW_PCRT	25	Delete bookmark failed because of you are not authorized	DMW_PUSVE25	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
/v2/posts/:pid/bookmark(DELETE)	PUSVE	DMW_PCRT	26	Delete bookmark failed because of pid not exists	DMW_PUSVE26	Failed to read saved post details. There may be a network error or there are too many concurrent calls to the server. Try again later.	Could not create user. Try again later.
						The copy privileges failed as nodebb plugin in not enabled for your instance. Contact your system administrator to enable it.	Could not create user. Try again later.

Could not create user. Try again later.Error Code Json:

    {
        "/discussion/forum/v2/read": {
            "post": {
                "endPoint": "/discussion/forum/v2/read",
                "key": "DiscussionForumRead",
                "errorObject": {
                    "err_404": {
                        "errMsg": "Forum read failed because of nodebb-plugin-create-forum plugin not enabled.",
                        "err": "DMW_FRED01"
                    },
                    "err_400": {
                        "errMsg": "Forum read failed because of request payload issue",
                        "err": "DMW_FRED02"
                    },
                    "err_500": {
                        "errMsg": "Forum read failed",
                        "err": "DMW_FRED03"
                    }
                }
            }
        },
        "/discussion/forum/v2/create": {
            "post": {
                "endPoint": "/discussion/forum/v2/create",
                "key": "DiscussionForumCreate",
                "errorObject": {
                    "err_404": {
                        "errMsg": "Forum create failed because nodebb-plugin-create-forum not enabled",
                        "err": "DMW_FCRT04"
                    },
                    "err_400": {
                        "errMsg": "Forum create failed because of request payload issue.",
                        "err": "DMW_FCRT05"
                    },
                    "err_500": {
                        "errMsg": "Forum create failed",
                        "err": "DMW_FCRT06"
                    }
                }
            }
        },
        "/discussion/forum/v2/remove": {
            "post": {
                "endPoint": "/discussion/forum/v2/remove",
                "key": "DiscussionForumRemove",
                "errorObject": {
                    "err_404": {
                        "errMsg": "Forum remove failed because nodebb-plugin-create-forum not enabled.",
                        "err": "DMW_FREM07"
                    },
                    "err_400": {
                        "errMsg": "Forum remove failed because of request pay is incorrect",
                        "err": "DMW_FREM09"
                    },
                    "err_500": {
                        "errMsg": "Forum remove failed",
                        "err": "DMW_FREM08"
                    }
                }
            }
        },
        "/discussion/tags": {
            "get": {
                "endPoint": "/discussion/tags",
                "key": "DiscussionForumTagsList",
                "errorObject": {
                    "err_500": {
                        "errMsg": "Tags read failed",
                        "err": "DMW_TRED01"
                    }
                }
            }
        },
        "/discussion/user/:userslug": {
            "get": {
                "endPoint": "/discussion/user/:userslug",
                "key": "DiscussionForumUserDetails",
                "errorObject": {
                    "err_500": {
                        "errMsg": "Tags read failed",
                        "err": "DMW_URED01"
                    },
                    "err_404": {
                        "errMsg": "Users details read failed because of user not exists",
                        "err": "DMW_URED02"
                    }
                }
            }
        },
        "/discussion/user/:userslug/upvoted": {
            "get": {
                "endPoint": "/discussion/user/:userslug/upvoted",
                "key": "DiscussionForumUserUpvoteDetails",
                "errorObject": {
                    "err_500": {
                        "errMsg": "User up vote post details read failed ",
                        "err": "DMW_UUVR03"
                    },
                    "err_404": {
                        "errMsg": "User up vote post details read failed because of user not exists",
                        "err": "DMW_UUVR04"
                    }
                }
            }
        },
        "/discussion/user/:userslug/downvoted": {
            "get": {
                "endPoint": "/discussion/user/:userslug/downvoted",
                "key": "DiscussionForumUserDownvoteDetails",
                "errorObject": {
                    "err_500": {
                        "errMsg": "User down vote post details read failed",
                        "err": "DMW_UDVR05"
                    },
                    "err_404": {
                        "errMsg": "User down vote post details read failed because of user not exists.",
                        "err": "DMW_UDVR06"
                    }
                }
            }
        },
        "/discussion/user/:userslug/bookmarks": {
            "get": {
                "endPoint": "/discussion/user/:userslug/bookmarks",
                "key": "DiscussionForumUserBookmarksDetails",
                "errorObject": {
                    "err_500": {
                        "errMsg": "User saved post details read failed",
                        "err": "DMW_UBMR07"
                    },
                    "err_404": {
                        "errMsg": "User saved post details read failed because of user not exists",
                        "err": "DMW_UBMR08"
                    }
                }
            }
        },
        "/discussion/user/v1/create": {
            "post": {
                "endPoint": "/discussion/user/v1/create",
                "key": "DiscussionForumCreate",
                "errorObject": {
                    "err_500": {
                        "errMsg": "Create user failed",
                        "err": "DMW_UCRT09"
                    },
                    "err_404": {
                        "errMsg": "Create user failed because of nodebb-plugin-sunbird-oidc plugin not enable",
                        "err": "DMW_UCRT10"
                    }
                }
            }
        },
        "/discussion/category/:category_id/:slug": {
            "get": {
                "endPoint": "/discussion/category/:category_id/:slug",
                "key": "DiscussionForumCategoryDetails",
                "errorObject": {
                    "err_500": {
                        "errMsg": "Category details read failed",
                        "err": "DMW_CDTL01"
                    },
                    "err_404": {
                        "errMsg": "Category details read failed because of category id not exists.",
                        "err": "DMW_CDTL02"
                    }
                }
            }
        },
        "/discussion/category/:cid": {
            "get": {
                "endPoint": "/discussion/category/:cid",
                "key": "DiscussionForumCategoryDetailsByCid",
                "errorObject": {
                    "err_500": {
                        "errMsg": "Category details read by cid failed",
                        "err": "DMW_CRED03"
                    },
                    "err_404": {
                        "errMsg": "Category details read by cid failed because of cid not exists.",
                        "err": "DMW_CRED04"
                    }
                }
            }
        },
        "/discussion/categories": {
            "get": {
                "endPoint": "/discussion/categories",
                "key": "DiscussionForumCategoryList",
                "errorObject": {
                    "err_500": {
                        "errMsg": "Access list of categories failed.",
                        "err": "DMW_CLST05"
                    }
                }
            }
        },
        "/discussion/v2/categories": {
            "get": {
                "endPoint": "/discussion/v2/categories",
                "key": "DiscussionForumCreateCategory",
                "errorObject": {
                    "err_500": {
                        "errMsg": "Create category failed",
                        "err": "DMW_CCRT06"
                    },
                    "err_404": {
                        "errMsg": "Create category failed because of nodebb-plugin-write-api not enable.",
                        "err": "DMW_CCRT07"
                    },
                    "err_401": {
                        "errMsg": "Create category failed because of you are not authorized",
                        "err": "DMW_CCRT08"
                    },
                    "err_400": {
                        "errMsg": "Create category failed because of request payload is incorrect.",
                        "err": "DMW_CCRT09"
                    }
                }
            }
        },
        "/discussion/v2/categories/:cid": {
            "post": {
                "endPoint": "/discussion/v2/categories/:cid",
                "key": "DiscussionForumUpdateCategory",
                "errorObject": {
                    "err_500": {
                        "errMsg": "Update category failed",
                        "err": "DMW_CUDT10"
                    },
                    "err_404": {
                        "errMsg": "Update category failed because of nodebb-plugin-write-api not enable or cid not exists.",
                        "err": "DMW_CUDT11"
                    },
                    "err_401": {
                        "errMsg": "Update category failed because of you are not authorized",
                        "err": "DMW_CUDT12"
                    },
                    "err_400": {
                        "errMsg": "Update category failed because of request payload is incorrect.",
                        "err": "DMW_CUDT13"
                    }
                },
                "delete": {
                    "endPoint": "/discussion/v2/categories/:cid",
                    "key": "DiscussionForumDeleteCategory",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Delete category failed",
                            "err": "DMW_CDEL14"
                        },
                        "err_404": {
                            "errMsg": "Delete category failed because of nodebb-plugin-write-api not enable or cid not exists.",
                            "err": "DMW_CDEL15"
                        },
                        "err_401": {
                            "errMsg": "Delete category failed because of you are not authorized",
                            "err": "DMW_CDEL16"
                        }
                    }
                }
            },
            "/discussion/unread": {
                "get": {
                    "endPoint": "/discussion/unread",
                    "key": "DiscussionForumUnreadTopics",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Access unread topics failed",
                            "err": "DMW_TUNR01"
                        }
                    }
                }
            },
            "/discussion/recent": {
                "get": {
                    "endPoint": "/discussion/recent",
                    "key": "DiscussionForumRecentopics",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Access recent topics failed.",
                            "err": "DMW_TRCT02"
                        }
                    }
                }
            },
            "/discussion/topic/:topic_id/:slug": {
                "get": {
                    "endPoint": "/discussion/topic/:topic_id/:slug",
                    "key": "DiscussionForumTopicDetails",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Access topic details failed",
                            "err": "DMW_TDTL03"
                        },
                        "err_404": {
                            "errMsg": "Access topic details failed because of topic id is not exists",
                            "err": "DMW_TDTL04"
                        }
                    }
                }
            },
            "/discussion/v2/topics": {
                "post": {
                    "endPoint": "/discussion/v2/topics",
                    "key": "DiscussionForumCreateTopic",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Create topic failed",
                            "err": "DMW_TCRT05"
                        },
                        "err_404": {
                            "errMsg": "Create topic  failed because of nodebb-plugin-write-api plugin not enabled.",
                            "err": "DMW_TCRT06"
                        },
                        "err_401": {
                            "errMsg": "Create topic  failed because of you are not authorized.",
                            "err": "DMW_TCRT07"
                        },
                        "err_400": {
                            "errMsg": "Create topic failed because of request payload is incorrect.",
                            "err": "DMW_TCRT08"
                        }
                    }
                }
            },
            "/discussion/v2/topics/:tid": {
                "post": {
                    "endPoint": "/discussion/v2/topics/:tid",
                    "key": "DiscussionForumAddReplyToTopic",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Add reply failed",
                            "err": "DMW_RCRT09"
                        },
                        "err_404": {
                            "errMsg": "Add reply failed because f nodebb-plugin-write-api is not enabled or tid not exists",
                            "err": "DMW_RCRT10"
                        },
                        "err_401": {
                            "errMsg": "Add reply failed because you are not authorized",
                            "err": "DMW_RCRT11"
                        },
                        "err_400": {
                            "errMsg": "Add reply failed because of request payload is incorrect.",
                            "err": "DMW_RCRT12"
                        }
                    }
                },
                "put": {
                    "endPoint": "/discussion/v2/topics/:tid",
                    "key": "DiscussionForumUpdateTopic",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Update topics/reply failed",
                            "err": "DMW_TUDT13"
                        },
                        "err_404": {
                            "errMsg": "Update topics/reply failed because of nodebb-plugin-write-api is not enabled or tid not exists.",
                            "err": "DMW_TUDT14"
                        },
                        "err_401": {
                            "errMsg": "Update topics/reply failed because of you are not authorized",
                            "err": "DMW_TUDT15"
                        },
                        "err_400": {
                            "errMsg": "Update topics/reply failed because of request payload is incorrect",
                            "err": "DMW_TUDT16"
                        }
                    }
                },
                "delete": {
                    "endPoint": "/discussion/v2/topics/:tid",
                    "key": "DiscussionForumDeleteTopic",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Delete topic/reply failed",
                            "err": "DMW_TDEL17"
                        },
                        "err_404": {
                            "errMsg": "Delete topic/reply failed because of nodebb-plugin-write-api is not enabled or tid not exists",
                            "err": "DMW_TDEL18"
                        },
                        "err_401": {
                            "errMsg": "Delete topic/reply failed because of you are not authorized",
                            "err": "DMW_TDEL19"
                        },
                        "err_400": {
                            "errMsg": "Delete topic/reply failed because of tid is not exists",
                            "err": "DMW_TDEL20"
                        }
                    }
                }
            },
            "/discussion/post/pid/:pid": {
                "get": {
                    "endPoint": "/discussion/post/pid/:pid",
                    "key": "DiscussionForumPostDetails",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Access post details failed",
                            "err": "DWM_PRED01"
                        },
                        "err_404": {
                            "errMsg": "Access post details failed because of pid is not exists",
                            "err": "DWM_PRED02"
                        }
                    }
                }
            },
            "/discussion/v2/posts/:pid": {
                "post": {
                    "endPoint": "/discussion/v2/posts/:pid",
                    "key": "DiscussionForumCreatePost",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Create post failed",
                            "err": "DMW_PCRT03"
                        },
                        "err_404": {
                            "errMsg": "Create post failed because of nodebb-plugin-write-api is not enabled or pid not exists",
                            "err": "DMW_PCRT04"
                        },
                        "err_401": {
                            "errMsg": "Create post failed because of you are not authorized",
                            "err": "DMW_PCRT05"
                        },
                        "err_400": {
                            "errMsg": "Create post failed because of request payload is incorrect",
                            "err": "DMW_PCRT06"
                        }
                    }
                },
                "delete": {
                    "endPoint": "/discussion/v2/posts/:pid",
                    "key": "DiscussionForumDeletePost",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Delete post failed",
                            "err": "DMW_PCRT07"
                        },
                        "err_404": {
                            "errMsg": "Delete post failed because of nodebb-plugin-write-api is not enabled or pid not exists",
                            "err": "DMW_PCRT08"
                        },
                        "err_401": {
                            "errMsg": "Delete post failed because of you are not authorized",
                            "err": "DMW_PCRT09"
                        },
                        "err_400": {
                            "errMsg": "Delete post failed because of pid is not exists",
                            "err": "DMW_PCRT10"
                        }
                    }
                }
            },
            "/discussion/v2/posts/:pid/vote": {
                "post": {
                    "endPoint": "/discussion/v2/posts/:pid/vote",
                    "key": "DiscussionForumCreatePost",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Adding vote to a post failed",
                            "err": "DMW_PVOT11"
                        },
                        "err_404": {
                            "errMsg": "Adding vote to a post failed because of nodebb-plugin-write-api is not enabled or pid not exists",
                            "err": "DMW_PVOT12"
                        },
                        "err_401": {
                            "errMsg": "Adding vote to a post failed because of you are not authorized",
                            "err": "DMW_PVOT13"
                        },
                        "err_400": {
                            "errMsg": "Adding vote to a post failed because of request payload is incorrect",
                            "err": "DMW_PVOT14"
                        }
                    }
                },
                "delete": {
                    "endPoint": "/discussion/v2/posts/:pid/vote",
                    "key": "DiscussionForumDeletePost",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Deleting vote failed",
                            "err": "DMW_PVDL15"
                        },
                        "err_404": {
                            "errMsg": "Deleting vote failed because of nodebb-plugin-write-api is not enabled or pid not exists",
                            "err": "DMW_PVDL16"
                        },
                        "err_401": {
                            "errMsg": "Deleting vote failed because of you are not authorized",
                            "err": "DMW_PVDL17"
                        },
                        "err_400": {
                            "errMsg": "Deleting vote failed because of pid is incorrect",
                            "err": "DMW_PVDL18"
                        }
                    }
                }
            },
            "/discussion/v2/posts/:pid/bookmark": {
                "post": {
                    "endPoint": "/discussion/v2/posts/:pid/bookmark",
                    "key": "DiscussionForumSavePost",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Bookmark post failed",
                            "err": "DMW_PSVE19"
                        },
                        "err_404": {
                            "errMsg": "Bookmark post failed because of nodebb-plugin-write-api not enabled or pid not exists",
                            "err": "DMW_PSVE20"
                        },
                        "err_401": {
                            "errMsg": "Bookmark post failed because of you are not authorized",
                            "err": "DMW_PSVE21"
                        },
                        "err_400": {
                            "errMsg": "Bookmark post failed because of pid  is incorrect",
                            "err": "DMW_PSVE22"
                        }
                    }
                },
                "delete": {
                    "endPoint": "/discussion/v2/posts/:pid/bookmark",
                    "key": "DiscussionForumUnsavePost",
                    "errorObject": {
                        "err_500": {
                            "errMsg": "Delete bookmark failed",
                            "err": "DMW_PUSVE23"
                        },
                        "err_404": {
                            "errMsg": "Delete bookmark failed because of nodebb-plugin-write-api is not enabled or pid incorrect.",
                            "err": "DMW_PSVE24"
                        },
                        "err_401": {
                            "errMsg": "Delete bookmark failed because of you are not authorized",
                            "err": "DMW_PSVE25"
                        },
                        "err_400": {
                            "errMsg": "Delete bookmark failed because of pid not exists",
                            "err": "DMW_PSVE26"
                        }
                    }
                }
            }
        }
    }

Challenges:

We can not tract nodebb api errors, because we are only accessing nodebb api, we not doing code changes.
We can track only discussion forum Errors and Portal Errors. But In Middleware and Portal backend we are doing proxy calls only, so we can tract only code issues instead of actual api issues.

How to get proper error code for a particular api in discussion middleware?

To get the proper error code for a particular api, we are maintain a json object like below

{
'/discussions/forum/v2/read': {
                              'errorMsg': "Forum read api failed because of plugin not enabled",
                              'err': "DMW_FRED01"
                              },
'/discussions/forum/v2/creat': {
                                'errorMsg': "Forum creat api failed because of plugin not enabled",
                                'err': "DMW_FCRT02"
                                },
'/discussions/v2/topic': {
                          'errorMsg': "Create topic  failed",
                          'err': "DMW_TCRT17"
                          },
.....
.....
.....
}

in Proxy object we are mapping the error code like below

**** Import Error Json file here as errorCodes *****
app.post(`${BASE_REPORT_URL}/forum/v2/read`, proxyObject());
app.post(`${BASE_REPORT_URL}/forum/v2/create`, proxyObject());
app.post(`${BASE_REPORT_URL}/v2/topics`, proxyObject());

function proxyObject() {
  return proxy(nodebbServiceUrl, {
    proxyReqOptDecorator: proxyUtils.decorateRequestHeaders(),
    proxyReqPathResolver: function (req) {
      let urlParam = req.originalUrl.replace('/discussion', '');
      let query = require('url').parse(req.url).query;
      if (query) {
        return require('url').parse(nodebbServiceUrl+ urlParam + '?' + query).path
      } else {
		const incomingUrl = req.protocol + '://' + req.get('host') + req.originalUrl;
        const proxyUrl = require('url').parse(nodebbServiceUrl + urlParam);
        return proxyUrl.path;
      }
    },
    userResDecorator: (proxyRes, proxyResData, req, res) => {
      try {
        const data = (proxyResData.toString('utf8'));
        if (proxyRes.statusCode === 404 ) {
          return data;
        } else {
          return proxyUtils.handleSessionExpiry(proxyRes, proxyResData, req, res, data);
        }
      } catch (err) {
      
      ***
      Here is mapping happned
      const errorObj = errorCodes[req.originalUrl];
      {
        "id": "discussion.forum.middleware",
        "ver": "1.0",
        "ts": "2020-11-25T07:18:09.945Z",
        "params": {
            "resmsgid": "5f36c090-2eee-11eb-80ed-6bb70096c082",
            "msgid": "req.headers['x-requester-id']",
            "status": "failed",
            "err": errorObj.err,
            "errmsg": errorObj .errorMsg
        }
    }
      ***
        return proxyUtils.handleSessionExpiry(proxyRes, proxyResData, req, res);
      }
    }
  })
}