Implement rough architecture

backend/dashapi/error.go

@@ -0,0 +1,62 @@
+/*
+ * Dash API
+ *
+ * No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)
+ *
+ * API version: 0.1
+ * Generated by: OpenAPI Generator (https://openapi-generator.tech)
+ */
+
+package dashapi
+
+import (
+	"errors"
+	"fmt"
+	"net/http"
+)
+
+var (
+	// ErrTypeAssertionError is thrown when type an interface does not match the asserted type
+	ErrTypeAssertionError = errors.New("unable to assert type")
+)
+
+// ParsingError indicates that an error has occurred when parsing request parameters
+type ParsingError struct {
+	Err error
+}
+
+func (e *ParsingError) Unwrap() error {
+	return e.Err
+}
+
+func (e *ParsingError) Error() string {
+	return e.Err.Error()
+}
+
+// RequiredError indicates that an error has occurred when parsing request parameters
+type RequiredError struct {
+	Field string
+}
+
+func (e *RequiredError) Error() string {
+	return fmt.Sprintf("required field '%s' is zero value.", e.Field)
+}
+
+// ErrorHandler defines the required method for handling error. You may implement it and inject this into a controller if
+// you would like errors to be handled differently from the DefaultErrorHandler
+type ErrorHandler func(w http.ResponseWriter, r *http.Request, err error, result *ImplResponse)
+
+// DefaultErrorHandler defines the default logic on how to handle errors from the controller. Any errors from parsing
+// request params will return a StatusBadRequest. Otherwise, the error code originating from the servicer will be used.
+func DefaultErrorHandler(w http.ResponseWriter, r *http.Request, err error, result *ImplResponse) {
+	if _, ok := err.(*ParsingError); ok {
+		// Handle parsing errors
+		EncodeJSONResponse(err.Error(), func(i int) *int { return &i }(http.StatusBadRequest), w)
+	} else if _, ok := err.(*RequiredError); ok {
+		// Handle missing required errors
+		EncodeJSONResponse(err.Error(), func(i int) *int { return &i }(http.StatusUnprocessableEntity), w)
+	} else {
+		// Handle all other errors
+		EncodeJSONResponse(err.Error(), &result.Code, w)
+	}
+}