1package server
2
3import (
4 "context"
5 "fmt"
6 "log/slog"
7 "net"
8 "net/http"
9 "net/url"
10 "os/user"
11 "runtime"
12 "strings"
13
14 "github.com/charmbracelet/crush/internal/app"
15 "github.com/charmbracelet/crush/internal/config"
16 "github.com/charmbracelet/crush/internal/csync"
17)
18
19// ErrServerClosed is returned when the server is closed.
20var ErrServerClosed = http.ErrServerClosed
21
22// InstanceState represents the state of a running [app.App] instance.
23type InstanceState uint8
24
25const (
26 // InstanceStateCreated indicates that the instance has been created but not yet started.
27 InstanceStateCreated InstanceState = iota
28 // InstanceStateStarted indicates that the instance is currently running.
29 InstanceStateStarted
30 // InstanceStateStopped indicates that the instance has been stopped.
31 InstanceStateStopped
32)
33
34// Instance represents a running [app.App] instance with its associated
35// resources and state.
36type Instance struct {
37 *app.App
38 State InstanceState
39 ln net.Listener
40 cfg *config.Config
41 id string
42 path string
43}
44
45// ParseHostURL parses a host URL into a [url.URL].
46func ParseHostURL(host string) (*url.URL, error) {
47 proto, addr, ok := strings.Cut(host, "://")
48 if !ok {
49 return nil, fmt.Errorf("invalid host format: %s", host)
50 }
51
52 var basePath string
53 if proto == "tcp" {
54 parsed, err := url.Parse("tcp://" + addr)
55 if err != nil {
56 return nil, fmt.Errorf("invalid tcp address: %v", err)
57 }
58 addr = parsed.Host
59 basePath = parsed.Path
60 }
61 return &url.URL{
62 Scheme: proto,
63 Host: addr,
64 Path: basePath,
65 }, nil
66}
67
68// DefaultHost returns the default server host.
69func DefaultHost() string {
70 sock := "crush.sock"
71 usr, err := user.Current()
72 if err == nil && usr.Uid != "" {
73 sock = fmt.Sprintf("crush-%s.sock", usr.Uid)
74 }
75 if runtime.GOOS == "windows" {
76 return fmt.Sprintf("npipe:////./pipe/%s", sock)
77 }
78 return fmt.Sprintf("unix:///tmp/%s", sock)
79}
80
81// Server represents a Crush server instance bound to a specific address.
82type Server struct {
83 // Addr can be a TCP address, a Unix socket path, or a Windows named pipe.
84 Addr string
85 network string
86
87 h *http.Server
88 ln net.Listener
89 ctx context.Context
90
91 // instances is a map of running applications managed by the server.
92 instances *csync.Map[string, *Instance]
93 cfg *config.Config
94 logger *slog.Logger
95}
96
97// SetLogger sets the logger for the server.
98func (s *Server) SetLogger(logger *slog.Logger) {
99 s.logger = logger
100}
101
102// DefaultServer returns a new [Server] instance with the default address.
103func DefaultServer(cfg *config.Config) *Server {
104 hostURL, err := ParseHostURL(DefaultHost())
105 if err != nil {
106 panic("invalid default host")
107 }
108 return NewServer(cfg, hostURL.Scheme, hostURL.Host)
109}
110
111// NewServer is a helper to create a new [Server] instance with the given
112// address. On Windows, if the address is not a "tcp" address, it will be
113// converted to a named pipe format.
114func NewServer(cfg *config.Config, network, address string) *Server {
115 s := new(Server)
116 s.Addr = address
117 s.network = network
118 s.cfg = cfg
119 s.instances = csync.NewMap[string, *Instance]()
120 s.ctx = context.Background()
121
122 var p http.Protocols
123 p.SetHTTP1(true)
124 p.SetUnencryptedHTTP2(true)
125 c := &controllerV1{Server: s}
126 mux := http.NewServeMux()
127 mux.HandleFunc("GET /v1/health", c.handleGetHealth)
128 mux.HandleFunc("GET /v1/version", c.handleGetVersion)
129 mux.HandleFunc("GET /v1/config", c.handleGetConfig)
130 mux.HandleFunc("POST /v1/control", c.handlePostControl)
131 mux.HandleFunc("GET /v1/instances", c.handleGetInstances)
132 mux.HandleFunc("POST /v1/instances", c.handlePostInstances)
133 mux.HandleFunc("DELETE /v1/instances/{id}", c.handleDeleteInstances)
134 mux.HandleFunc("GET /v1/instances/{id}", c.handleGetInstance)
135 mux.HandleFunc("GET /v1/instances/{id}/config", c.handleGetInstanceConfig)
136 mux.HandleFunc("GET /v1/instances/{id}/events", c.handleGetInstanceEvents)
137 mux.HandleFunc("GET /v1/instances/{id}/sessions", c.handleGetInstanceSessions)
138 mux.HandleFunc("POST /v1/instances/{id}/sessions", c.handlePostInstanceSessions)
139 mux.HandleFunc("GET /v1/instances/{id}/sessions/{sid}", c.handleGetInstanceSession)
140 mux.HandleFunc("GET /v1/instances/{id}/sessions/{sid}/history", c.handleGetInstanceSessionHistory)
141 mux.HandleFunc("GET /v1/instances/{id}/sessions/{sid}/messages", c.handleGetInstanceSessionMessages)
142 mux.HandleFunc("GET /v1/instances/{id}/lsps", c.handleGetInstanceLSPs)
143 mux.HandleFunc("GET /v1/instances/{id}/lsps/{lsp}/diagnostics", c.handleGetInstanceLSPDiagnostics)
144 mux.HandleFunc("GET /v1/instances/{id}/permissions/skip", c.handleGetInstancePermissionsSkip)
145 mux.HandleFunc("POST /v1/instances/{id}/permissions/skip", c.handlePostInstancePermissionsSkip)
146 mux.HandleFunc("POST /v1/instances/{id}/permissions/grant", c.handlePostInstancePermissionsGrant)
147 mux.HandleFunc("GET /v1/instances/{id}/agent", c.handleGetInstanceAgent)
148 mux.HandleFunc("POST /v1/instances/{id}/agent", c.handlePostInstanceAgent)
149 mux.HandleFunc("POST /v1/instances/{id}/agent/init", c.handlePostInstanceAgentInit)
150 mux.HandleFunc("POST /v1/instances/{id}/agent/update", c.handlePostInstanceAgentUpdate)
151 mux.HandleFunc("GET /v1/instances/{id}/agent/sessions/{sid}", c.handleGetInstanceAgentSession)
152 mux.HandleFunc("POST /v1/instances/{id}/agent/sessions/{sid}/cancel", c.handlePostInstanceAgentSessionCancel)
153 mux.HandleFunc("GET /v1/instances/{id}/agent/sessions/{sid}/prompts/queued", c.handleGetInstanceAgentSessionPromptQueued)
154 mux.HandleFunc("POST /v1/instances/{id}/agent/sessions/{sid}/prompts/clear", c.handlePostInstanceAgentSessionPromptClear)
155 mux.HandleFunc("POST /v1/instances/{id}/agent/sessions/{sid}/summarize", c.handleGetInstanceAgentSessionSummarize)
156 s.h = &http.Server{
157 Protocols: &p,
158 Handler: s.loggingHandler(mux),
159 }
160 if network == "tcp" {
161 s.h.Addr = address
162 }
163 return s
164}
165
166// Serve accepts incoming connections on the listener.
167func (s *Server) Serve(ln net.Listener) error {
168 return s.h.Serve(ln)
169}
170
171// ListenAndServe starts the server and begins accepting connections.
172func (s *Server) ListenAndServe() error {
173 if s.ln != nil {
174 return fmt.Errorf("server already started")
175 }
176 ln, err := listen(s.network, s.Addr)
177 if err != nil {
178 return fmt.Errorf("failed to listen on %s: %w", s.Addr, err)
179 }
180 return s.Serve(ln)
181}
182
183func (s *Server) closeListener() {
184 if s.ln != nil {
185 s.ln.Close()
186 s.ln = nil
187 }
188}
189
190// Close force close all listeners and connections.
191func (s *Server) Close() error {
192 defer func() { s.closeListener() }()
193 return s.h.Close()
194}
195
196// Shutdown gracefully shuts down the server without interrupting active
197// connections. It stops accepting new connections and waits for existing
198// connections to finish.
199func (s *Server) Shutdown(ctx context.Context) error {
200 defer func() { s.closeListener() }()
201 return s.h.Shutdown(ctx)
202}
203
204func (s *Server) logDebug(r *http.Request, msg string, args ...any) {
205 if s.logger != nil {
206 s.logger.With(
207 slog.String("method", r.Method),
208 slog.String("url", r.URL.String()),
209 slog.String("remote_addr", r.RemoteAddr),
210 ).Debug(msg, args...)
211 }
212}
213
214func (s *Server) logError(r *http.Request, msg string, args ...any) {
215 if s.logger != nil {
216 s.logger.With(
217 slog.String("method", r.Method),
218 slog.String("url", r.URL.String()),
219 slog.String("remote_addr", r.RemoteAddr),
220 ).Error(msg, args...)
221 }
222}