{"record":{"id":"124bf90c9082b3d0","repo":"flipped-aurora/gin-vue-admin","slug":"w-124bf9","errorCode":null,"errorMessage":"菜单授权写回失败: %w","messagePattern":"菜单授权写回失败: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"server/mcp/role_menu_assigner.go","lineNumber":170,"sourceCode":"\t\treturn textResultWithJSON(\"角色菜单授权结果：\", result)\n\t}\n\n\t// 全量写回:当前授权中已被删除的基础菜单构造最小对象原样保留,不因本次授权而丢失\n\tpayload := make([]system.SysBaseMenu, 0, len(merged))\n\tfor _, id := range merged {\n\t\tif menu, ok := menuIndex[id]; ok {\n\t\t\tpayload = append(payload, menu)\n\t\t\tcontinue\n\t\t}\n\t\tvar placeholder system.SysBaseMenu\n\t\tplaceholder.ID = id\n\t\tpayload = append(payload, placeholder)\n\t}\n\tif _, err := postUpstream[map[string]any](ctx, \"/menu/addMenuAuthority\", map[string]any{\n\t\t\"authorityId\": authorityID,\n\t\t\"menus\":       payload,\n\t}); err != nil {\n\t\treturn nil, fmt.Errorf(\"菜单授权写回失败: %w\", err)\n\t}\n\n\tresult.Message = fmt.Sprintf(\"成功为角色 %d 新增 %d 个菜单授权(含自动补齐父级 %d 个),当前共 %d 个\",\n\t\tauthorityID, len(added), len(result.ParentAutoAdded), len(merged))\n\treturn textResultWithJSON(\"角色菜单授权结果：\", result)\n}\n\n// flattenBaseMenus 把基础菜单树摊平成 id→菜单 映射\nfunc flattenBaseMenus(list []system.SysBaseMenu, into map[uint]system.SysBaseMenu) {\n\tfor i := range list {\n\t\tinto[list[i].ID] = list[i]\n\t\tif len(list[i].Children) > 0 {\n\t\t\tflattenBaseMenus(list[i].Children, into)\n\t\t}\n\t}\n}\n","sourceCodeStart":152,"sourceCodeEnd":187,"githubUrl":"https://github.com/flipped-aurora/gin-vue-admin/blob/3136500ef380842b0eb6c4daa87c3f8a47fcf9e0/server/mcp/role_menu_assigner.go#L152-L187","documentation":"Thrown when the write-back step of the role-menu assigner fails: POST /menu/addMenuAuthority with the merged (existing + new + auto-added parents) menu payload returned an error. The read succeeded and a merged payload was built, but persisting the new authorization set to the upstream server failed.","triggerScenarios":"Handle() reaches the addMenuAuthority call with authorityId and menus payload, and postUpstream fails: upstream down, 401/403 (Casbin denies the endpoint), invalid authorityId (role deleted between read and write), malformed payload causing upstream validation error, or network timeout.","commonSituations":"Backend restarted mid-operation; token expired between the two calls; role deleted concurrently by another admin; proxy timeout on large menu payloads; permission for the menu-management API revoked from the MCP user.","solutions":["Re-run the assignment after confirming the upstream server is healthy — the tool is idempotent since it re-reads current grants.","Check the MCP client's JWT is still valid and has access to /menu/addMenuAuthority in Casbin.","Verify the authorityId still exists before invoking the tool.","Inspect the wrapped cause for HTTP status; a 403 points to permissions, 500 to upstream bugs.","For large payloads, check reverse-proxy body size/timeouts."],"exampleFix":"null","handlingStrategy":"try-catch","validationCode":"// verify the role still exists and the token grants menu APIs before write-back\nif !roleExists(authorityID) { return fmt.Errorf(\"authority %d missing\", authorityID) }\nif !canAccess(\"/menu/addMenuAuthority\") { return fmt.Errorf(\"token lacks menu write permission\") }","typeGuard":null,"tryCatchPattern":"_, err := postUpstream[map[string]any](ctx, \"/menu/addMenuAuthority\", body)\nif err != nil {\n    log.Printf(\"addMenuAuthority failed for role %d: %v\", authorityID, err)\n    // safe to retry: the tool re-reads current grants on next run\n    return err\n}","preventionTips":["Re-run the tool after fixing transient issues — it is idempotent due to the pre-read.","Avoid deleting roles while assignments are in flight.","Keep token lifetime longer than the operation window or use auto-refresh.","Monitor upstream 5xx rates on menu endpoints."],"tags":["http","upstream-api","mcp","write-failure"],"backgroundTag":"upstream-http-request-failed","analyzedSha":"3136500ef380842b0eb6c4daa87c3f8a47fcf9e0","analyzedAt":"2026-08-31T13:50:02.721Z","schemaVersion":2},"datasetVersion":"2026-08-31T19:17:28.585Z"}