In the Go Gin framework, how to make all controllers share public data?

Implement data sharing among controllers under the Go Gin framework

This article discusses how to implement data sharing between controllers in the Go Gin framework, similar to the way in PHP sharing member attributes by inheriting the parent controller. The data sharing of the Gin framework is mainly divided into two scenarios: global sharing and in-request sharing.

1. Global shared variables

Applicable to configuration information that remains unchanged throughout the application life cycle. It can be implemented using global variables:

 package main

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

var databaseAddress = "127.0.0.1:3306"
var siteName = "My Website"

func main() {
    router := gin.Default()

    router.GET("/test1", func(c *gin.Context) {
        c.String(200, "Database Address: %s, Site Name: %s\n", databaseAddress, siteName)
    })

    router.GET("/test2", func(c *gin.Context) {
        c.String(200, "Database Address: %s, Site Name: %s\n", databaseAddress, siteName)
    })

    router.Run(":8080")
}

All controllers can directly access databaseAddress and siteName .

2. Share variables within the request

Applicable to data that needs to be shared every time you request, such as user information, request ID, etc. The middleware mechanism of the Gin framework is very suitable for this scenario:

 package main

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

func main() {
    router := gin.Default()

    // Middleware settings request shared data router.Use(func(c *gin.Context) {
        c.Set("requestID", "unique-request-id") // Replace with the actual request ID to generate logic c.Next()
    })

    router.GET("/test1", func(c *gin.Context) {
        requestID, _ := c.Get("requestID")
        c.String(200, "Request ID: %s\n", requestID.(string))
    })

    router.GET("/test2", func(c *gin.Context) {
        requestID, _ := c.Get("requestID")
        c.String(200, "Request ID: %s\n", requestID.(string))
    })

    router.Run(":8080")
}

The middleware sets requestID at the beginning of each request, and all subsequent processing functions can be accessed through c.Get("requestID") . This simulates the effect of the parent controller passing data to the child controller in PHP. More complex shared data structures can use custom structures instead of simple strings.

Through the above two methods, public data sharing between different controllers can be effectively realized in the Go Gin framework to meet the needs of different scenarios. Which method to choose depends on the life cycle and scope of the data.

The above is the detailed content of In the Go Gin framework, how to make all controllers share public data?. For more information, please follow other related articles on the PHP Chinese website!