add graceful process termination on windows (#82)

proxy/process.go

@@ -304,7 +304,9 @@ func (p *Process) stopCommand(sigtermTTL time.Duration) {
 		return
 	}
 
-	p.cmd.Process.Signal(syscall.SIGTERM)
+	if err := p.terminateProcess(); err != nil {
+		fmt.Fprintf(p.logMonitor, "!!! failed to gracefully terminate process [%s]: %v\n", p.ID, err)
+	}
 
 	select {
 	case <-sigtermTimeout.Done():

proxy/process_stop.go

@@ -0,0 +1,9 @@
+//go:build !windows
+
+package proxy
+
+import "syscall"
+
+func (p *Process) terminateProcess() error {
+	return p.cmd.Process.Signal(syscall.SIGTERM)
+}

proxy/process_stop_windows.go

@@ -0,0 +1,14 @@
+//go:build windows
+
+package proxy
+
+import (
+	"fmt"
+	"os/exec"
+)
+
+func (p *Process) terminateProcess() error {
+	pid := fmt.Sprintf("%d", p.cmd.Process.Pid)
+	cmd := exec.Command("taskkill", "/f", "/t", "/pid", pid)
+	return cmd.Run()
+}