Prototype with single host server and no admin panel (#2)

Reviewed-on: wrenn/sandbox#2
Co-authored-by: pptx704 <rafeed@omukk.dev>
Co-committed-by: pptx704 <rafeed@omukk.dev>

envd/internal/services/process/signal.go

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: Apache-2.0
+
+package process
+
+import (
+	"context"
+	"fmt"
+	"syscall"
+
+	"connectrpc.com/connect"
+
+	rpc "git.omukk.dev/wrenn/sandbox/envd/internal/services/spec/process"
+)
+
+func (s *Service) SendSignal(
+	_ context.Context,
+	req *connect.Request[rpc.SendSignalRequest],
+) (*connect.Response[rpc.SendSignalResponse], error) {
+	handler, err := s.getProcess(req.Msg.GetProcess())
+	if err != nil {
+		return nil, err
+	}
+
+	var signal syscall.Signal
+	switch req.Msg.GetSignal() {
+	case rpc.Signal_SIGNAL_SIGKILL:
+		signal = syscall.SIGKILL
+	case rpc.Signal_SIGNAL_SIGTERM:
+		signal = syscall.SIGTERM
+	default:
+		return nil, connect.NewError(connect.CodeUnimplemented, fmt.Errorf("invalid signal: %s", req.Msg.GetSignal()))
+	}
+
+	err = handler.SendSignal(signal)
+	if err != nil {
+		return nil, connect.NewError(connect.CodeInternal, fmt.Errorf("error sending signal: %w", err))
+	}
+
+	return connect.NewResponse(&rpc.SendSignalResponse{}), nil
+}