wip

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Signed-off-by: mudler <mudler@localai.io>

pkg/stdio/server.go

@@ -0,0 +1,237 @@
+package stdio
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/http"
+	"os/exec"
+	"sync"
+	"time"
+
+	"github.com/gorilla/websocket"
+)
+
+// Process represents a running process with its stdio streams
+type Process struct {
+	ID        string
+	Cmd       *exec.Cmd
+	Stdin     io.WriteCloser
+	Stdout    io.ReadCloser
+	Stderr    io.ReadCloser
+	CreatedAt time.Time
+}
+
+// Server handles process management and stdio streaming
+type Server struct {
+	processes map[string]*Process
+	mu        sync.RWMutex
+	upgrader  websocket.Upgrader
+}
+
+// NewServer creates a new stdio server
+func NewServer() *Server {
+	return &Server{
+		processes: make(map[string]*Process),
+		upgrader: websocket.Upgrader{
+			CheckOrigin: func(r *http.Request) bool { return true },
+		},
+	}
+}
+
+// StartProcess starts a new process and returns its ID
+func (s *Server) StartProcess(ctx context.Context, command string, args []string) (string, error) {
+	cmd := exec.CommandContext(ctx, command, args...)
+
+	stdin, err := cmd.StdinPipe()
+	if err != nil {
+		return "", fmt.Errorf("failed to create stdin pipe: %w", err)
+	}
+
+	stdout, err := cmd.StdoutPipe()
+	if err != nil {
+		return "", fmt.Errorf("failed to create stdout pipe: %w", err)
+	}
+
+	stderr, err := cmd.StderrPipe()
+	if err != nil {
+		return "", fmt.Errorf("failed to create stderr pipe: %w", err)
+	}
+
+	if err := cmd.Start(); err != nil {
+		return "", fmt.Errorf("failed to start process: %w", err)
+	}
+
+	process := &Process{
+		ID:        fmt.Sprintf("%d", time.Now().UnixNano()),
+		Cmd:       cmd,
+		Stdin:     stdin,
+		Stdout:    stdout,
+		Stderr:    stderr,
+		CreatedAt: time.Now(),
+	}
+
+	s.mu.Lock()
+	s.processes[process.ID] = process
+	s.mu.Unlock()
+
+	return process.ID, nil
+}
+
+// StopProcess stops a running process
+func (s *Server) StopProcess(id string) error {
+	s.mu.Lock()
+	process, exists := s.processes[id]
+	if !exists {
+		s.mu.Unlock()
+		return fmt.Errorf("process not found: %s", id)
+	}
+	delete(s.processes, id)
+	s.mu.Unlock()
+
+	if err := process.Cmd.Process.Kill(); err != nil {
+		return fmt.Errorf("failed to kill process: %w", err)
+	}
+
+	return nil
+}
+
+// GetProcess returns a process by ID
+func (s *Server) GetProcess(id string) (*Process, error) {
+	s.mu.RLock()
+	process, exists := s.processes[id]
+	s.mu.RUnlock()
+
+	if !exists {
+		return nil, fmt.Errorf("process not found: %s", id)
+	}
+
+	return process, nil
+}
+
+// ListProcesses returns all running processes
+func (s *Server) ListProcesses() []*Process {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+
+	processes := make([]*Process, 0, len(s.processes))
+	for _, p := range s.processes {
+		processes = append(processes, p)
+	}
+
+	return processes
+}
+
+// Start starts the HTTP server
+func (s *Server) Start(addr string) error {
+	http.HandleFunc("/processes", s.handleProcesses)
+	http.HandleFunc("/processes/", s.handleProcess)
+	http.HandleFunc("/ws/", s.handleWebSocket)
+
+	return http.ListenAndServe(addr, nil)
+}
+
+func (s *Server) handleProcesses(w http.ResponseWriter, r *http.Request) {
+	switch r.Method {
+	case http.MethodGet:
+		processes := s.ListProcesses()
+		json.NewEncoder(w).Encode(processes)
+	case http.MethodPost:
+		var req struct {
+			Command string   `json:"command"`
+			Args    []string `json:"args"`
+		}
+		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		id, err := s.StartProcess(r.Context(), req.Command, req.Args)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		w.Header().Set("Content-Type", "application/json")
+		json.NewEncoder(w).Encode(map[string]string{"id": id})
+	default:
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+	}
+}
+
+func (s *Server) handleProcess(w http.ResponseWriter, r *http.Request) {
+	id := r.URL.Path[len("/processes/"):]
+
+	switch r.Method {
+	case http.MethodGet:
+		process, err := s.GetProcess(id)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusNotFound)
+			return
+		}
+		json.NewEncoder(w).Encode(process)
+	case http.MethodDelete:
+		if err := s.StopProcess(id); err != nil {
+			http.Error(w, err.Error(), http.StatusNotFound)
+			return
+		}
+		w.WriteHeader(http.StatusNoContent)
+	default:
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+	}
+}
+
+func (s *Server) handleWebSocket(w http.ResponseWriter, r *http.Request) {
+	id := r.URL.Path[len("/ws/"):]
+	process, err := s.GetProcess(id)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusNotFound)
+		return
+	}
+
+	conn, err := s.upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	defer conn.Close()
+
+	// Handle stdin
+	go func() {
+		for {
+			_, message, err := conn.ReadMessage()
+			if err != nil {
+				return
+			}
+			process.Stdin.Write(message)
+		}
+	}()
+
+	// Handle stdout
+	go func() {
+		buf := make([]byte, 1024)
+		for {
+			n, err := process.Stdout.Read(buf)
+			if err != nil {
+				return
+			}
+			conn.WriteMessage(websocket.TextMessage, buf[:n])
+		}
+	}()
+
+	// Handle stderr
+	go func() {
+		buf := make([]byte, 1024)
+		for {
+			n, err := process.Stderr.Read(buf)
+			if err != nil {
+				return
+			}
+			conn.WriteMessage(websocket.TextMessage, buf[:n])
+		}
+	}()
+
+	// Wait for process to exit
+	process.Cmd.Wait()
+}