feat: add exception handling utility with common HTTP error responses (#76)

Author: Leoj030

src/index.luau

@@ -28,11 +28,9 @@ Nova.__index = Nova
 
 Nova.chain = require("@utils/Chain")
 Nova.response = require("@utils/Response")
+Nova.exception = require("@utils/Exception")
 
-local function devMiddleware(req: Types.Request, next: Types.Next)
-    local res = next()
-    local status = res.config.status or 200
-
+local function statusLog(status: number, req)
     local statusColor = "\27[31m"
     if status >= 200 and status < 300 then
         statusColor = "\27[32m"
@@ -47,6 +45,13 @@ local function devMiddleware(req: Types.Request, next: Types.Next)
     end
 end
 
+local function devMiddleware(req: Types.Request, next: Types.Next)
+    local res = next()
+    local status = res.config.status or 200
+
+    statusLog(status, req)
+end
+
 function Nova.new(port: number, middlewares: { (req: Types.Request, next: Types.Next) -> () }?)
     local self = setmetatable({}, Nova)
     self.port = port
@@ -120,20 +125,30 @@ function Nova:listen(handler: () -> ())
                 return FAVICON_CACHED_RESPONSE or FAVICON_EMPTY_RESPONSE :: net.NetResponse
             end
 
-            local success, result: Types.ResponsePayload | any = pcall(rootPipeline, request)
-
+            local success, result: Types.ResponsePayload 
+            | { statusCode: number, message: string } | any = pcall(rootPipeline, request)
+            
             if not success then
-                if isDev then
+                statusLog(result.statusCode or 500, request)
+                if typeof(result) == "table" then
+                    return {
+                        status = result.statusCode,
+                        body = encode("json", { error = result.message }),
+                        headers = { ["Content-Type"] = "application/json" }
+                    }
+                else
                     local errorMessage = debug.traceback(tostring(result), 2)
-                    print("\27[31m[Error]: " .. errorMessage .. "\27[0m")
+                    print("\27[31m[Error]: \n" .. errorMessage .. "\27[0m")
+
+                    return INTERNAL_ERROR_RESPONSE :: net.NetResponse
                 end
-                return INTERNAL_ERROR_RESPONSE :: net.NetResponse
             end
-
-            local status: number
+            
+            local status: number?
             local headers = nil
 
             if result.config then
+                
                 status = result.config.status
                 headers = result.config.headers
             end

src/utils/Exception.luau

@@ -0,0 +1,52 @@
+local Exception = {}
+
+-- // BASE EXCEPTION FUNCTION // --
+
+function Exception.HttpException(statusCode: number, message: string)
+    return {
+        statusCode = statusCode,
+        message = message
+    }
+end
+
+-- // COMMON 4xx // --
+
+function Exception.BadRequest(message: string?)
+    return Exception.HttpException(400, message or "Bad Request")
+end
+
+function Exception.Unauthorized(message: string?)
+    return Exception.HttpException(401, message or "Unauthorized")
+end
+
+function Exception.Forbidden(message: string?)
+    return Exception.HttpException(403, message or "Forbidden")
+end
+
+function Exception.NotFound(message: string?)
+    return Exception.HttpException(404, message or "Not Found")
+end
+
+function Exception.Conflict(message: string?)
+    return Exception.HttpException(409, message or "Conflict")
+end
+
+function Exception.TooManyRequests(message: string?)
+    return Exception.HttpException(429, message or "Too Many Requests")
+end
+
+-- // COMMON 5xx // --
+
+function Exception.InternalServerError(message: string?)
+    return Exception.HttpException(500, message or "Internal Server Error")
+end
+
+function Exception.BadGateway(message: string?)
+    return Exception.HttpException(502, message or "Bad Gateway")
+end
+
+function Exception.ServiceUnavailable(message: string?)
+    return Exception.HttpException(503, message or "Service Unavailable")
+end
+
+return Exception