howmuch/internal/pkg/middleware/requestid.go

// MIT License
//
// Copyright (c) 2024 vinchent <vinchent@vinchent.xyz>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package middleware

import (
	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

const requestID = "X-Request-Id"

func RequestID() gin.HandlerFunc {
	return func(ctx *gin.Context) {
		var rid string

		if rid = ctx.GetHeader(requestID); rid != "" {
			ctx.Request.Header.Add(requestID, rid)
			ctx.Next()
		}

		rid = uuid.NewString()
		ctx.Request.Header.Add(requestID, rid)
		ctx.Header(requestID, rid)
		ctx.Next()
	}
}