Charon/backend/internal/api/middleware/request_id.go

package middleware

import (
	"context"

	"github.com/Wikid82/charon/backend/internal/logger"
	"github.com/Wikid82/charon/backend/internal/trace"
	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
	"github.com/sirupsen/logrus"
)

const RequestIDHeader = "X-Request-ID"

// RequestID generates a uuid per request and places it in context and header.
func RequestID() gin.HandlerFunc {
	return func(c *gin.Context) {
		rid := uuid.New().String()
		c.Set(string(trace.RequestIDKey), rid)
		c.Writer.Header().Set(RequestIDHeader, rid)
		// Add to logger fields for this request
		entry := logger.WithFields(map[string]any{"request_id": rid})
		c.Set("logger", entry)
		// Propagate into the request context so it can be used by services
		ctx := context.WithValue(c.Request.Context(), trace.RequestIDKey, rid)
		c.Request = c.Request.WithContext(ctx)
		c.Next()
	}
}

// GetRequestLogger retrieves the request-scoped logger from context or the global logger
func GetRequestLogger(c *gin.Context) *logrus.Entry {
	if v, ok := c.Get("logger"); ok {
		if entry, ok := v.(*logrus.Entry); ok {
			return entry
		}
	}
	// fallback
	return logger.Log()
}