尝试使用Gin Gonic应用程序时的恐慌错误
尝试使用Gin Gonic应用程序时的恐慌错误
提问于 2016-11-26 00:21:45
我正在尝试使用Go的Gin框架创建一个小API，当我试图将它拆分到许多文件中时，会遇到一个错误。因为我是围棋的新手，所以我可能犯了一个很愚蠢的错误，所以请原谅我:)
我的项目结构是：
models.go
package models
type Note struct {
Title string `form:"title" json:"title" binding:"required"`
Body string `form:"body" json:"body" binding:"required"`
}
var Notes []Note
func MockData() {
Notes = append(Notes, Note{Title: "My first note", Body: "Brazil beated Argentina very badly :("})
Notes = append(Notes, Note{Title: "Some more notes", Body: "I hope we can defeat Colombia"})
}url_mappings.go
package mappings
import (
"gopkg.in/gin-gonic/gin.v1"
"github.com/juanmougan/notepad/api/controllers"
)
var Router *gin.Engine
func CreateUrlMappings() {
Router := gin.Default()
// v1 of the API
v1 := Router.Group("/v1")
{
v1.GET("/notes", controllers.AllNotesEndpoint)
}
}main.go
package main
import (
"github.com/juanmougan/notepad/api/models"
"github.com/juanmougan/notepad/api/mappings"
)
func main() {
// TODO eventually use a real DB
models.MockData()
mappings.CreateUrlMappings()
// Listen and server on 0.0.0.0:8080
mappings.Router.Run(":8080")
}notes_controllers.go
package controllers
import (
"gopkg.in/gin-gonic/gin.v1"
"net/http"
"github.com/juanmougan/notepad/api/models"
)
func AllNotesEndpoint(c *gin.Context) {
c.JSON(http.StatusOK, models.Notes)
}当我运行这个应用程序时，它似乎启动的很好。
MacBook-Pro-de-Juan:notepad juanma$ go run api/main/main.go
[GIN-debug] [WARNING] Running in "debug" mode. Switch to "release" mode in production.
- using env: export GIN_MODE=release
- using code: gin.SetMode(gin.ReleaseMode)
[GIN-debug] GET /v1/notes --> github.com/juanmougan/notepad/api/controllers.AllNotesEndpoint (3 handlers)
[GIN-debug] Listening and serving HTTP on :8080但是，当试图导航到http://localhost:8080/v1/notes时，我会得到以下错误：
http: panic serving [::1]:50178: runtime error: invalid memory address or nil pointer dereference
goroutine 35 [running]:
net/http.(*conn).serve.func1(0xc420166400)
/usr/local/opt/go/libexec/src/net/http/server.go:1491 +0x12a
panic(0x396220, 0xc42000c0b0)
/usr/local/opt/go/libexec/src/runtime/panic.go:458 +0x243
gopkg.in/gin-gonic/gin%2ev1.(*Engine).ServeHTTP(0x0, 0x5a7c80, 0xc4201ec0d0, 0xc4200f0870)
/Users/juanma/.go/src/gopkg.in/gin-gonic/gin.v1/gin.go:260 +0x26
net/http.serverHandler.ServeHTTP(0xc420166380, 0x5a7c80, 0xc4201ec0d0, 0xc4200f0870)
/usr/local/opt/go/libexec/src/net/http/server.go:2202 +0x7d
net/http.(*conn).serve(0xc420166400, 0x5a83c0, 0xc420174440)
/usr/local/opt/go/libexec/src/net/http/server.go:1579 +0x4b7
created by net/http.(*Server).Serve
/usr/local/opt/go/libexec/src/net/http/server.go:2293 +0x44d
http: panic serving [::1]:50179: runtime error: invalid memory address or nil pointer dereference
goroutine 36 [running]:
net/http.(*conn).serve.func1(0xc420166600)
/usr/local/opt/go/libexec/src/net/http/server.go:1491 +0x12a
panic(0x396220, 0xc42000c0b0)
/usr/local/opt/go/libexec/src/runtime/panic.go:458 +0x243
gopkg.in/gin-gonic/gin%2ev1.(*Engine).ServeHTTP(0x0, 0x5a7c80, 0xc420214000, 0xc4200f0960)
/Users/juanma/.go/src/gopkg.in/gin-gonic/gin.v1/gin.go:260 +0x26
net/http.serverHandler.ServeHTTP(0xc420166380, 0x5a7c80, 0xc420214000, 0xc4200f0960)
/usr/local/opt/go/libexec/src/net/http/server.go:2202 +0x7d
net/http.(*conn).serve(0xc420166600, 0x5a83c0, 0xc420174600)
/usr/local/opt/go/libexec/src/net/http/server.go:1579 +0x4b7
created by net/http.(*Server).Serve
/usr/local/opt/go/libexec/src/net/http/server.go:2293 +0x44d这很奇怪，因为我没有看到任何对我自己的代码的引用。我发现了一些类似的问题，像这样，但它们似乎都在堆栈跟踪的顶部对自己的代码有错误。因为我可以看到，我只得到框架错误。
对这里可能出什么问题有什么想法吗？
提前感谢
回答 1
Stack Overflow用户
回答已采纳
发布于 2016-11-26 01:30:43
更改映射的初始化
var Router *gin.Engine
func CreateUrlMappings() {
Router = gin.Default()
// v1 of the API
v1 := Router.Group("/v1")
{
v1.GET("/notes", controllers.AllNotesEndpoint)
}
}当使用":=“运算符时，您正在创建一个新的局部变量
Router := gin.Default() // this is wrong if you are using a global var页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/40813776
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