1package app
2
3import (
4 "context"
5 "database/sql"
6 "errors"
7 "fmt"
8 "log/slog"
9 "sync"
10 "time"
11
12 tea "github.com/charmbracelet/bubbletea/v2"
13 "github.com/charmbracelet/crush/internal/config"
14 "github.com/charmbracelet/crush/internal/csync"
15 "github.com/charmbracelet/crush/internal/db"
16 "github.com/charmbracelet/crush/internal/format"
17 "github.com/charmbracelet/crush/internal/history"
18 "github.com/charmbracelet/crush/internal/llm/agent"
19 "github.com/charmbracelet/crush/internal/log"
20 "github.com/charmbracelet/crush/internal/pubsub"
21
22 "github.com/charmbracelet/crush/internal/lsp"
23 "github.com/charmbracelet/crush/internal/message"
24 "github.com/charmbracelet/crush/internal/permission"
25 "github.com/charmbracelet/crush/internal/session"
26)
27
28type App struct {
29 Sessions session.Service
30 Messages message.Service
31 History history.Service
32 Permissions permission.Service
33
34 CoderAgent agent.Service
35
36 LSPClients *csync.Map[string, *lsp.Client]
37
38 lspStates *csync.Map[string, LSPClientInfo]
39 lspBroker *pubsub.Broker[LSPEvent]
40
41 config *config.Config
42
43 serviceEventsWG *sync.WaitGroup
44 eventsCtx context.Context
45 events chan tea.Msg
46 tuiWG *sync.WaitGroup
47
48 // global context and cleanup functions
49 globalCtx context.Context
50 cleanupFuncs []func() error
51}
52
53// New initializes a new applcation instance.
54func New(ctx context.Context, conn *sql.DB, cfg *config.Config) (*App, error) {
55 // Attach config to context for use in services.
56 ctx = config.WithContext(ctx, cfg)
57
58 q := db.New(conn)
59 sessions := session.NewService(q)
60 messages := message.NewService(q)
61 files := history.NewService(q, conn)
62 skipPermissionsRequests := cfg.Permissions != nil && cfg.Permissions.SkipRequests
63 allowedTools := []string{}
64 if cfg.Permissions != nil && cfg.Permissions.AllowedTools != nil {
65 allowedTools = cfg.Permissions.AllowedTools
66 }
67
68 app := &App{
69 Sessions: sessions,
70 Messages: messages,
71 History: files,
72 Permissions: permission.NewPermissionService(cfg.WorkingDir(), skipPermissionsRequests, allowedTools),
73 LSPClients: csync.NewMap[string, *lsp.Client](),
74 lspStates: csync.NewMap[string, LSPClientInfo](),
75 lspBroker: pubsub.NewBroker[LSPEvent](),
76
77 globalCtx: ctx,
78
79 config: cfg,
80
81 events: make(chan tea.Msg, 100),
82 serviceEventsWG: &sync.WaitGroup{},
83 tuiWG: &sync.WaitGroup{},
84 }
85
86 app.setupEvents()
87
88 // Initialize LSP clients in the background.
89 app.initLSPClients(ctx)
90
91 // cleanup database upon app shutdown
92 app.cleanupFuncs = append(app.cleanupFuncs, conn.Close)
93
94 // TODO: remove the concept of agent config, most likely.
95 if cfg.IsConfigured() {
96 if err := app.InitCoderAgent(); err != nil {
97 return nil, fmt.Errorf("failed to initialize coder agent: %w", err)
98 }
99 } else {
100 slog.Warn("No agent configuration found")
101 }
102 return app, nil
103}
104
105// Events returns the application's event channel.
106func (app *App) Events() <-chan tea.Msg {
107 return app.events
108}
109
110// Config returns the application configuration.
111func (app *App) Config() *config.Config {
112 return app.config
113}
114
115// RunNonInteractive handles the execution flow when a prompt is provided via
116// CLI flag.
117func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
118 slog.Info("Running in non-interactive mode")
119
120 ctx, cancel := context.WithCancel(ctx)
121 defer cancel()
122
123 // Start spinner if not in quiet mode.
124 var spinner *format.Spinner
125 if !quiet {
126 spinner = format.NewSpinner(ctx, cancel, "Generating")
127 spinner.Start()
128 }
129
130 // Helper function to stop spinner once.
131 stopSpinner := func() {
132 if !quiet && spinner != nil {
133 spinner.Stop()
134 spinner = nil
135 }
136 }
137 defer stopSpinner()
138
139 const maxPromptLengthForTitle = 100
140 titlePrefix := "Non-interactive: "
141 var titleSuffix string
142
143 if len(prompt) > maxPromptLengthForTitle {
144 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
145 } else {
146 titleSuffix = prompt
147 }
148 title := titlePrefix + titleSuffix
149
150 sess, err := app.Sessions.Create(ctx, title)
151 if err != nil {
152 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
153 }
154 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
155
156 // Automatically approve all permission requests for this non-interactive session
157 app.Permissions.AutoApproveSession(sess.ID)
158
159 done, err := app.CoderAgent.Run(ctx, sess.ID, prompt)
160 if err != nil {
161 return fmt.Errorf("failed to start agent processing stream: %w", err)
162 }
163
164 messageEvents := app.Messages.Subscribe(ctx)
165 messageReadBytes := make(map[string]int)
166
167 for {
168 select {
169 case result := <-done:
170 stopSpinner()
171
172 if result.Error != nil {
173 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
174 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
175 return nil
176 }
177 return fmt.Errorf("agent processing failed: %w", result.Error)
178 }
179
180 msgContent := result.Message.Content().String()
181 readBts := messageReadBytes[result.Message.ID]
182
183 if len(msgContent) < readBts {
184 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(msgContent), "read_bytes", readBts)
185 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(msgContent), readBts)
186 }
187 fmt.Println(msgContent[readBts:])
188 messageReadBytes[result.Message.ID] = len(msgContent)
189
190 slog.Info("Non-interactive: run completed", "session_id", sess.ID)
191 return nil
192
193 case event := <-messageEvents:
194 msg := event.Payload
195 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
196 stopSpinner()
197
198 content := msg.Content().String()
199 readBytes := messageReadBytes[msg.ID]
200
201 if len(content) < readBytes {
202 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
203 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
204 }
205
206 part := content[readBytes:]
207 fmt.Print(part)
208 messageReadBytes[msg.ID] = len(content)
209 }
210
211 case <-ctx.Done():
212 stopSpinner()
213 return ctx.Err()
214 }
215 }
216}
217
218func (app *App) UpdateAgentModel() error {
219 return app.CoderAgent.UpdateModel()
220}
221
222func (app *App) setupEvents() {
223 ctx, cancel := context.WithCancel(app.globalCtx)
224 app.eventsCtx = ctx
225 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
226 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
227 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
228 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
229 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
230 setupSubscriber(ctx, app.serviceEventsWG, "mcp", agent.SubscribeMCPEvents, app.events)
231 setupSubscriber(ctx, app.serviceEventsWG, "lsp", app.SubscribeLSPEvents, app.events)
232 cleanupFunc := func() error {
233 cancel()
234 app.serviceEventsWG.Wait()
235 return nil
236 }
237 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
238}
239
240func setupSubscriber[T any](
241 ctx context.Context,
242 wg *sync.WaitGroup,
243 name string,
244 subscriber func(context.Context) <-chan pubsub.Event[T],
245 outputCh chan<- tea.Msg,
246) {
247 wg.Go(func() {
248 subCh := subscriber(ctx)
249 for {
250 select {
251 case event, ok := <-subCh:
252 if !ok {
253 slog.Debug("subscription channel closed", "name", name)
254 return
255 }
256 var msg tea.Msg = event
257 select {
258 case outputCh <- msg:
259 case <-time.After(2 * time.Second):
260 slog.Warn("message dropped due to slow consumer", "name", name)
261 case <-ctx.Done():
262 slog.Debug("subscription cancelled", "name", name)
263 return
264 }
265 case <-ctx.Done():
266 slog.Debug("subscription cancelled", "name", name)
267 return
268 }
269 }
270 })
271}
272
273func (app *App) InitCoderAgent() error {
274 coderAgentCfg := app.config.Agents["coder"]
275 if coderAgentCfg.ID == "" {
276 return fmt.Errorf("coder agent configuration is missing")
277 }
278 var err error
279 app.CoderAgent, err = agent.NewAgent(
280 app.globalCtx,
281 app.config,
282 coderAgentCfg,
283 app.Permissions,
284 app.Sessions,
285 app.Messages,
286 app.History,
287 app.LSPClients,
288 )
289 if err != nil {
290 slog.Error("Failed to create coder agent", "err", err)
291 return err
292 }
293
294 // Add MCP client cleanup to shutdown process
295 app.cleanupFuncs = append(app.cleanupFuncs, agent.CloseMCPClients)
296
297 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
298 return nil
299}
300
301// Subscribe sends events to the TUI as tea.Msgs.
302func (app *App) Subscribe(program *tea.Program) {
303 defer log.RecoverPanic("app.Subscribe", func() {
304 slog.Info("TUI subscription panic: attempting graceful shutdown")
305 program.Quit()
306 })
307
308 app.tuiWG.Add(1)
309 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
310 app.cleanupFuncs = append(app.cleanupFuncs, func() error {
311 slog.Debug("Cancelling TUI message handler")
312 tuiCancel()
313 app.tuiWG.Wait()
314 return nil
315 })
316 defer app.tuiWG.Done()
317
318 for {
319 select {
320 case <-tuiCtx.Done():
321 slog.Debug("TUI message handler shutting down")
322 return
323 case msg, ok := <-app.events:
324 if !ok {
325 slog.Debug("TUI message channel closed")
326 return
327 }
328 program.Send(msg)
329 }
330 }
331}
332
333// Shutdown performs a graceful shutdown of the application.
334func (app *App) Shutdown() {
335 if app.CoderAgent != nil {
336 app.CoderAgent.CancelAll()
337 }
338
339 // Shutdown all LSP clients.
340 for name, client := range app.LSPClients.Seq2() {
341 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
342 if err := client.Close(shutdownCtx); err != nil {
343 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
344 }
345 cancel()
346 }
347
348 // Call call cleanup functions.
349 for _, cleanup := range app.cleanupFuncs {
350 if cleanup != nil {
351 if err := cleanup(); err != nil {
352 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
353 }
354 }
355 }
356}