英文:
remote debug golang dlv wait for a client to connect before continuing the code (visual studio code client)
问题
我喜欢能够在等待客户端连接到dlv调试器之前执行简单的操作，但没有成功。我有一个简单的Go服务器：
package main
import (
"fmt"
"net/http"
)
func hello(w http.ResponseWriter, req *http.Request) {
fmt.Fprintf(w, "hello\n")
}
func headers(w http.ResponseWriter, req *http.Request) {
for name, headers := range req.Header {
for _, h := range headers {
fmt.Fprintf(w, "%v: %v\n", name, h)
}
}
}
func main() {
fmt.Println("server started now!")
http.HandleFunc("/hello", hello)
http.HandleFunc("/headers", headers)
http.ListenAndServe(":8090", nil)
}
我在Linux机器上这样启动服务器：
vagrant@vagrant:~/go_dev/very_simple_server_dir$ dlv debug /home/vagrant/go_dev/very_simple_server_dir/very_simple_server.go --headless --listen=:3000 --log
API server listening at: [::]:3000
2022-10-31T06:18:47Z warning layer=rpc Listening for remote connections (connections are not authenticated nor encrypted)
2022-10-31T06:18:47Z info layer=debugger launching process with args: [/home/vagrant/go_dev/very_simple_server_dir/__debug_bin]
2022-10-31T06:18:47Z warning layer=debugger can't find build-id note on binary
在Visual Studio Code中，launch.json文件如下：
{
"version": "0.2.0",
"configurations": [
{
"name": "Connect to server",
"type": "go",
"request": "attach",
"mode": "remote",
"remotePath": "/home/vagrant/go_dev/very_simple_server_dir/",
"cwd": "${workspaceFolder}",
"port": 3000,
"host": "127.0.0.1",
"trace": "verbose",
"asRoot": true
}
]
}
它可以成功连接到远程服务器，问题是我希望dlv调试服务器在执行Go代码之前等待客户端连接。我想要能够在func main()的第二行设置断点。请问我该如何做到这一点？
英文:
I like to be able do very simple thing wait for the client to connect to dlv debugger before continue the code without success .
i have simple go server :
package main
import (
"fmt"
"net/http"
)
func hello(w http.ResponseWriter, req *http.Request) {
fmt.Fprintf(w, "hello\n")
}
func headers(w http.ResponseWriter, req *http.Request) {
for name, headers := range req.Header {
for _, h := range headers {
fmt.Fprintf(w, "%v: %v\n", name, h)
}
}
}
func main() {
fmt.Println("server started now!")
http.HandleFunc("/hello", hello)
http.HandleFunc("/headers", headers)
http.ListenAndServe(":8090", nil)
}
i start the server on the linux mechine like this:
vagrant@vagrant:~/go_dev/very_simple_server_dir$ dlv debug /home/vagrant/go_dev/very_simple_server_dir/very_simple_server.go --headless --listen=:3000 --log
API server listening at: [::]:3000
2022-10-31T06:18:47Z warning layer=rpc Listening for remote connections (connections are not authenticated nor encrypted)
2022-10-31T06:18:47Z info layer=debugger launching process with args: [/home/vagrant/go_dev/very_simple_server_dir/__debug_bin]
2022-10-31T06:18:47Z warning layer=debugger can't find build-id note on binary
in visual studio code the launch.json looks like this :
"version": "0.2.0",
"configurations": [
{
"name": "Connect to server",
"type": "go",
"request": "attach",
"mode": "remote",
"remotePath": "/home/vagrant/go_dev/very_simple_server_dir/",
"cwd" : "${workspaceFolder}",
"port": 3000,
"host": "127.0.0.1",
"trace": "verbose",
"asRoot": true,
}
]
it connectes just fine to the remote server the problem is that i like the dlv debug server wait to the client to connect before it execute the go code .
i want to be able to set break point in func main() second line
how can i do that ?
答案1
得分: 1
你的main.go中的第二行代码只是注册了你的处理函数（在这个例子中是hello函数）。这发生在你使用ListenAndServe()启动应用程序之前。
我猜你想在应用程序启动后进行调试。你可能想在hello函数的第一行（也是唯一一行）设置一个断点。
英文:
The second line in your main.go does no more than register your handler function (hello in this case). This happens before your app is started with ListenAndServe().
I assume you want to debug your app after it is started. You may want to set a breakpoint at the first (and the only) line of your hello function.
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