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Unstoppable program: CSignal: interrupt not received #358
Description
Summary
I am trying to run a Golang http server through python but then the program cannot be stopped.
I tried to send SIGTERM(ctrl+c)/SIGKILL(ctrl+d) signals from the terminal but it didn't work.
Sending the signal from another terminal works.
Reproduce the error
File structure
.
├── go.mod
├── go.sum
├── main.go
├── Makefile
├── out
└── test.pyFiles
main.go
package mypackage
import (
"fmt"
"net/http"
)
func helloHandler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hello, World!")
}
func Run() {
http.HandleFunc("/", helloHandler)
http.ListenAndServe(":8080", nil)
}Makefile
build:
export LD_LIBRARY_PATH=$$LD_LIBRARY_PATH:.
gopy build -output=out -vm=python3 .test.py
from out import mypackage
mypackage.Run()NOTE: The example in the README.md says to first enter out folder, but the import does not work from inside the out folder
Run the test
python3 test.pyThen try to stop the process with ctrl+c (NOTE: this interrupt signal works fine if the Go code is compiled as a regular binary and not for the binding)
Workaround
A workaround is to run the server in a goroutine while the main thread block until it receives the signal:
func Run() {
server := &http.Server{
Addr: ":8080",
Handler: http.DefaultServeMux,
}
http.HandleFunc("/", helloHandler)
// Channel to listen for OS signals
stop := make(chan os.Signal, 1)
signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
go func() {
if err := server.ListenAndServe(); err != nil && err != http.ErrServerClosed {
fmt.Printf("ListenAndServe(): %s\n", err)
}
}()
fmt.Println("Server is ready to handle requests at :8080")
<-stop // Block until we receive a signal
fmt.Println("Shutting down the server...")
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
if err := server.Shutdown(ctx); err != nil {
fmt.Printf("Server Shutdown Failed:%+v", err)
}
fmt.Println("Server stopped")
}
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