implements suggested solution

docs/advanced-guide/gofr-errors/page.md

@@ -44,6 +44,8 @@ dbErr2 := datasource.ErrorDB{Message : "database connection timed out!"}
 GoFr's error structs implements an interface with `Error() string` and `StatusCode() int` methods, users can override the 
 status code by implementing it for their custom error.
 
+You can optionally define a log level for your error with the `LogLevel() logging.Level` methods
+
 #### Usage:
 ```go
 type customError struct {
@@ -57,4 +59,8 @@ func (c customError) Error() string {
 func (c customError) StatusCode() int {
 	return http.StatusMethodNotAllowed
 }
+
+func (c customError) LogLevel() logging.Level {
+	return logging.WARN
+}
 ```

pkg/gofr/handler.go

@@ -145,22 +145,30 @@ func panicRecoveryHandler(re any, log logging.Logger, panicked chan struct{}) {
 	})
 }
 
-//nolint:nestif // Log the error(if any) with traceID and errorMessage.
+// Log the error(if any) with traceID and errorMessage.
 func (h handler) logError(traceID string, err error) {
 	if err != nil {
 		errorLog := &ErrorLogEntry{TraceID: traceID, Error: err.Error()}
 
-		if errors.As(err, &gofrHTTP.ErrorEntityAlreadyExist{}) {
-			h.container.Logger.Info(errorLog)
-		} else if errors.As(err, &gofrHTTP.ErrorEntityNotFound{}) {
-			h.container.Logger.Info(errorLog)
-		} else if errors.As(err, &gofrHTTP.ErrorInvalidParam{}) {
-			h.container.Logger.Info(errorLog)
-		} else if errors.As(err, &gofrHTTP.ErrorMissingParam{}) {
-			h.container.Logger.Info(errorLog)
-		} else {
-			h.container.Logger.Error(errorLog)
+		// define the default log level for error
+		loggerHelper := h.container.Logger.Error
+
+		switch logging.GetLogLevelForError(err) {
+		case logging.ERROR:
+			// we use the default log level for error
+		case logging.INFO:
+			loggerHelper = h.container.Logger.Info
+		case logging.NOTICE:
+			loggerHelper = h.container.Logger.Notice
+		case logging.DEBUG:
+			loggerHelper = h.container.Logger.Debug
+		case logging.WARN:
+			loggerHelper = h.container.Logger.Warn
+		case logging.FATAL:
+			loggerHelper = h.container.Logger.Fatal
 		}
+
+		loggerHelper(errorLog)
 	}
 }
 

pkg/gofr/http/errors.go

@@ -5,6 +5,8 @@ import (
 	"fmt"
 	"net/http"
 	"strings"
+
+	"gofr.dev/pkg/gofr/logging"
 )
 
 const alreadyExistsMessage = "entity already exists"
@@ -24,10 +26,13 @@ func (ErrorEntityNotFound) StatusCode() int {
 	return http.StatusNotFound
 }
 
-// ErrorEntityAlreadyExist represents an error for when entity is already present in the storage and we are trying to make duplicate entry.
-type ErrorEntityAlreadyExist struct {
+func (ErrorEntityNotFound) LogLevel() logging.Level {
+	return logging.INFO
 }
 
+// ErrorEntityAlreadyExist represents an error for when entity is already present in the storage and we are trying to make duplicate entry.
+type ErrorEntityAlreadyExist struct{}
+
 func (ErrorEntityAlreadyExist) Error() string {
 	return alreadyExistsMessage
 }
@@ -36,6 +41,10 @@ func (ErrorEntityAlreadyExist) StatusCode() int {
 	return http.StatusConflict
 }
 
+func (ErrorEntityAlreadyExist) LogLevel() logging.Level {
+	return logging.WARN
+}
+
 // ErrorInvalidParam represents an error for invalid parameter values.
 type ErrorInvalidParam struct {
 	Params []string `json:"param,omitempty"` // Params contains the list of invalid parameter names.
@@ -49,6 +58,10 @@ func (ErrorInvalidParam) StatusCode() int {
 	return http.StatusBadRequest
 }
 
+func (ErrorInvalidParam) LogLevel() logging.Level {
+	return logging.INFO
+}
+
 // ErrorMissingParam represents an error for missing parameters in a request.
 type ErrorMissingParam struct {
 	Params []string `json:"param,omitempty"`
@@ -58,6 +71,10 @@ func (e ErrorMissingParam) Error() string {
 	return fmt.Sprintf("'%d' missing parameter(s): %s", len(e.Params), strings.Join(e.Params, ", "))
 }
 
+func (ErrorMissingParam) LogLevel() logging.Level {
+	return logging.INFO
+}
+
 func (ErrorMissingParam) StatusCode() int {
 	return http.StatusBadRequest
 }
@@ -69,6 +86,10 @@ func (ErrorInvalidRoute) Error() string {
 	return "route not registered"
 }
 
+func (ErrorInvalidRoute) LogLevel() logging.Level {
+	return logging.INFO
+}
+
 func (ErrorInvalidRoute) StatusCode() int {
 	return http.StatusNotFound
 }
@@ -84,6 +105,10 @@ func (ErrorRequestTimeout) StatusCode() int {
 	return http.StatusRequestTimeout
 }
 
+func (ErrorRequestTimeout) LogLevel() logging.Level {
+	return logging.INFO
+}
+
 // ErrorPanicRecovery represents an error for request which panicked.
 type ErrorPanicRecovery struct{}
 
@@ -94,3 +119,26 @@ func (ErrorPanicRecovery) Error() string {
 func (ErrorPanicRecovery) StatusCode() int {
 	return http.StatusInternalServerError
 }
+
+func (ErrorPanicRecovery) LogLevel() logging.Level {
+	return logging.ERROR
+}
+
+// validate the errors satisfy the underlying interfaces they depend on.
+var (
+	_ statusCodeResponder = ErrorEntityNotFound{}
+	_ statusCodeResponder = ErrorEntityAlreadyExist{}
+	_ statusCodeResponder = ErrorInvalidParam{}
+	_ statusCodeResponder = ErrorMissingParam{}
+	_ statusCodeResponder = ErrorInvalidRoute{}
+	_ statusCodeResponder = ErrorRequestTimeout{}
+	_ statusCodeResponder = ErrorPanicRecovery{}
+
+	_ logging.LogLevelResponder = ErrorEntityNotFound{}
+	_ logging.LogLevelResponder = ErrorEntityAlreadyExist{}
+	_ logging.LogLevelResponder = ErrorInvalidParam{}
+	_ logging.LogLevelResponder = ErrorMissingParam{}
+	_ logging.LogLevelResponder = ErrorInvalidRoute{}
+	_ logging.LogLevelResponder = ErrorRequestTimeout{}
+	_ logging.LogLevelResponder = ErrorPanicRecovery{}
+)

pkg/gofr/logging/logger.go

@@ -219,3 +219,21 @@ func checkIfTerminal(w io.Writer) bool {
 func (l *logger) ChangeLevel(level Level) {
 	l.level = level
 }
+
+// LogLevelResponder is an interface that provides a method to get the log level.
+type LogLevelResponder interface {
+	LogLevel() Level
+}
+
+// GetLogLevelForError returns the log level for the given error.
+// If the error implements [logLevelResponder], its log level is returned.
+// Otherwise, the default log level "error" is returned.
+func GetLogLevelForError(err error) Level {
+	level := ERROR
+
+	if e, ok := err.(LogLevelResponder); ok {
+		level = e.LogLevel()
+	}
+
+	return level
+}