Golang上的基于標頭的版本控制是一種在開發過程中管理代碼版本的有效方法。通過在代碼文件的開頭添加版本信息,開發人員可以方便地跟蹤代碼的變更和版本歷史。這種版本控制方法不僅簡單易用,而且適用于各種規模的項目。php小編西瓜將在本文中詳細介紹Golang上基于標頭的版本控制的使用方法和注意事項,幫助開發人員更好地管理和維護代碼。無論你是初學者還是有經驗的開發者,本文都將為你提供有價值的參考和指導。讓我們一起來探索這個有趣而實用的版本控制技術吧!
問題內容
我想使用 gin 在 go 上實現基于標頭的版本控制。我正在考慮使用中間件功能在路由器上執行此操作。
客戶端將調用相同的 api url,并且版本將位于自定義 http 標頭中,如下所示:
調用版本1
獲取/用戶/12345678
接受版本:v1
調用版本 2:
獲取/用戶/12345678
接受版本:v2
因此,路由器可以識別標頭并調用特定版本。像這樣的事情:
router := gin.Default()
v1 := router.Group("/v1")
v1.Use(VersionMiddleware())
v1.GET("/user/:id", func(c *gin.Context) {
c.String(http.StatusOK, "This is the v1 API")
})
v2 := router.Group("/v2")
v2.Use(VersionMiddleware())
v2.GET("/user/:id", func(c *gin.Context) {
c.String(http.StatusOK, "This is the v2 API")
})
func VersionMiddleware() gin.HandlerFunc {
return func(c *gin.Context) {
version := c.Request.Header.Get(configuration.GetConfigValue("VersionHeader"))
// Construct the new URL path based on the version number
path := fmt.Sprintf("/%s%s", version, c.Request.URL.Path)
// Modify the request URL path to point to the new version-specific endpoint
c.Request.URL.Path = path
c.Next()
}
}
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解決方法
請檢查下面的代碼片段。我使用 reverseproxy 重定向到給定的版本。您需要仔細驗證給定的版本。否則會導致遞歸調用。
注意:我使用了兩個版本的 /user get(/v1/user 和 /v2/user)。
示例代碼
package main
import (
"net/http"
"net/http/httputil"
"regexp"
"github.com/gin-gonic/gin"
)
func main() {
router := gin.default()
router.use(versionmiddleware())
v1 := router.group("/v1")
v1.get("/user", func(c *gin.context) {
c.string(http.statusok, "this is the v1 api")
})
v2 := router.group("/v2")
v2.get("/user", func(c *gin.context) {
c.string(http.statusok, "this is the v2 api")
})
router.run(":8082")
}
func versionmiddleware() gin.handlerfunc {
return func(c *gin.context) {
// you need to check c.request.url.path whether
// already have a version or not, if it has a valid
// version, return.
regex, _ := regexp.compile("/v[0-9]+")
ver := regex.matchstring(c.request.url.path)
if ver {
return
}
version := c.request.header.get("accept-version")
// you need to validate given version by the user here.
// if version is not a valid version, return error
// mentioning that given version is invalid.
director := func(req *http.request) {
r := c.request
req.url.scheme = "http"
req.url.host = r.host
req.url.path = "/"+ version + r.url.path
}
proxy := &httputil.reverseproxy{director: director}
proxy.servehttp(c.writer, c.request)
}
}
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或
您可以使用下面的杜松子酒包裝實現。
示例
package main
import (
"net/http"
"github.com/gin-gonic/gin"
"github.com/udayangaac/stackoverflow/golang/75860989/ginwrapper"
)
func main() {
engine := gin.default()
router := ginwrapper.newrouter(engine)
defaultrouter := router.default()
defaultrouter.get("/profile",func(ctx *gin.context) {
})
v1 := router.withversion("/v1")
v1.get("/user",func(ctx *gin.context) {
ctx.string(http.statusok, "this is the profile v1 api")
})
v2 := router.withversion("/v2")
v2.get("/user",func(ctx *gin.context) {
ctx.string(http.statusok, "this is the profile v2 api")
})
engine.run(":8082")
}
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包裝
package ginwrapper
import (
"fmt"
"net/http"
"github.com/gin-gonic/gin"
)
type router struct {
router *gin.engine
versiongroups map[string]*gin.routergroup
}
type versionedrouter struct {
version string
router
}
func newrouter(router *gin.engine) *router {
return &router{
router: router,
versiongroups: make(map[string]*gin.routergroup),
}
}
func (a *router) default() versionedrouter {
return versionedrouter{router: *a }
}
func (a *router) withversion(version string) versionedrouter {
if _,ok := a.versiongroups[version]; ok {
panic("cannot initialize same version multiple times")
}
a.versiongroups[version] = a.router.group(version)
return versionedrouter{router: *a,version:version }
}
func (vr versionedrouter) get(relativepath string, handlers ...gin.handlerfunc) {
vr.handle(http.methodget,relativepath,handlers...)
}
// note: you need to follow the same for other http methods.
// as an example, we can write a method for post http method as below,
//
// func (vr versionedrouter) post(relativepath string, handlers ...gin.handlerfunc) {
// vr.handle(http.methodpost,relativepath,handlers...)
// }
func (vr versionedrouter)handle(method,relativepath string, handlers ...gin.handlerfunc) {
if !vr.isrouteexist(method,relativepath) {
vr.router.handle(method,relativepath,func(ctx *gin.context) {
version := ctx.request.header.get("accept-version")
if len(version) == 0 {
ctx.string(http.statusbadrequest,"accept-version header is empty")
}
ctx.request.url.path = fmt.sprintf("/%s%s", version, ctx.request.url.path)
vr.router.handlecontext(ctx)
})
}
versionedrelativepath := vr.version + relativepath
if !vr.isrouteexist(method,versionedrelativepath) {
vr.router.handle(method,versionedrelativepath,handlers... )
}
}
func (a versionedrouter) isrouteexist(method,relativepath string) bool {
for _,route := range a.router.routes() {
if route.method == method && relativepath == route.path {
return true
}
}
return false
}
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示例請求
/v1/user
curl --location 'localhost:8082/user' \ --header 'accept-version: v1'
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/v2/user
curl --location 'localhost:8082/user' \ --header 'Accept-version: v2'
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