1package app
2
3import (
4 "context"
5 "database/sql"
6 "errors"
7 "fmt"
8 "log/slog"
9 "maps"
10 "sync"
11 "time"
12
13 tea "github.com/charmbracelet/bubbletea/v2"
14 "github.com/charmbracelet/crush/internal/config"
15 "github.com/charmbracelet/crush/internal/csync"
16 "github.com/charmbracelet/crush/internal/db"
17 "github.com/charmbracelet/crush/internal/format"
18 "github.com/charmbracelet/crush/internal/history"
19 "github.com/charmbracelet/crush/internal/llm/agent"
20 "github.com/charmbracelet/crush/internal/log"
21 "github.com/charmbracelet/crush/internal/pubsub"
22
23 "github.com/charmbracelet/crush/internal/lsp"
24 "github.com/charmbracelet/crush/internal/message"
25 "github.com/charmbracelet/crush/internal/permission"
26 "github.com/charmbracelet/crush/internal/session"
27)
28
29type App struct {
30 Sessions session.Service
31 Messages message.Service
32 History history.Service
33 Permissions permission.Service
34
35 CoderAgent agent.Service
36
37 LSPClients map[string]*lsp.Client
38
39 clientsMutex sync.RWMutex
40
41 watcherCancelFuncs *csync.Slice[context.CancelFunc]
42 lspWatcherWG sync.WaitGroup
43
44 config *config.Config
45
46 serviceEventsWG *sync.WaitGroup
47 eventsCtx context.Context
48 events chan tea.Msg
49 tuiWG *sync.WaitGroup
50
51 // global context and cleanup functions
52 globalCtx context.Context
53 cleanupFuncs []func() error
54}
55
56// New initializes a new applcation instance.
57func New(ctx context.Context, conn *sql.DB, cfg *config.Config) (*App, error) {
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: make(map[string]*lsp.Client),
74
75 globalCtx: ctx,
76
77 config: cfg,
78
79 watcherCancelFuncs: csync.NewSlice[context.CancelFunc](),
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// Config returns the application configuration.
106func (app *App) Config() *config.Config {
107 return app.config
108}
109
110// RunNonInteractive handles the execution flow when a prompt is provided via
111// CLI flag.
112func (app *App) RunNonInteractive(ctx context.Context, prompt string, quiet bool) error {
113 slog.Info("Running in non-interactive mode")
114
115 ctx, cancel := context.WithCancel(ctx)
116 defer cancel()
117
118 // Start spinner if not in quiet mode.
119 var spinner *format.Spinner
120 if !quiet {
121 spinner = format.NewSpinner(ctx, cancel, "Generating")
122 spinner.Start()
123 }
124
125 // Helper function to stop spinner once.
126 stopSpinner := func() {
127 if !quiet && spinner != nil {
128 spinner.Stop()
129 spinner = nil
130 }
131 }
132 defer stopSpinner()
133
134 const maxPromptLengthForTitle = 100
135 titlePrefix := "Non-interactive: "
136 var titleSuffix string
137
138 if len(prompt) > maxPromptLengthForTitle {
139 titleSuffix = prompt[:maxPromptLengthForTitle] + "..."
140 } else {
141 titleSuffix = prompt
142 }
143 title := titlePrefix + titleSuffix
144
145 sess, err := app.Sessions.Create(ctx, title)
146 if err != nil {
147 return fmt.Errorf("failed to create session for non-interactive mode: %w", err)
148 }
149 slog.Info("Created session for non-interactive run", "session_id", sess.ID)
150
151 // Automatically approve all permission requests for this non-interactive session
152 app.Permissions.AutoApproveSession(sess.ID)
153
154 done, err := app.CoderAgent.Run(ctx, sess.ID, prompt)
155 if err != nil {
156 return fmt.Errorf("failed to start agent processing stream: %w", err)
157 }
158
159 messageEvents := app.Messages.Subscribe(ctx)
160 messageReadBytes := make(map[string]int)
161
162 for {
163 select {
164 case result := <-done:
165 stopSpinner()
166
167 if result.Error != nil {
168 if errors.Is(result.Error, context.Canceled) || errors.Is(result.Error, agent.ErrRequestCancelled) {
169 slog.Info("Non-interactive: agent processing cancelled", "session_id", sess.ID)
170 return nil
171 }
172 return fmt.Errorf("agent processing failed: %w", result.Error)
173 }
174
175 msgContent := result.Message.Content().String()
176 readBts := messageReadBytes[result.Message.ID]
177
178 if len(msgContent) < readBts {
179 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(msgContent), "read_bytes", readBts)
180 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(msgContent), readBts)
181 }
182 fmt.Println(msgContent[readBts:])
183 messageReadBytes[result.Message.ID] = len(msgContent)
184
185 slog.Info("Non-interactive: run completed", "session_id", sess.ID)
186 return nil
187
188 case event := <-messageEvents:
189 msg := event.Payload
190 if msg.SessionID == sess.ID && msg.Role == message.Assistant && len(msg.Parts) > 0 {
191 stopSpinner()
192
193 content := msg.Content().String()
194 readBytes := messageReadBytes[msg.ID]
195
196 if len(content) < readBytes {
197 slog.Error("Non-interactive: message content is shorter than read bytes", "message_length", len(content), "read_bytes", readBytes)
198 return fmt.Errorf("message content is shorter than read bytes: %d < %d", len(content), readBytes)
199 }
200
201 part := content[readBytes:]
202 fmt.Print(part)
203 messageReadBytes[msg.ID] = len(content)
204 }
205
206 case <-ctx.Done():
207 stopSpinner()
208 return ctx.Err()
209 }
210 }
211}
212
213func (app *App) UpdateAgentModel() error {
214 return app.CoderAgent.UpdateModel()
215}
216
217func (app *App) setupEvents() {
218 ctx, cancel := context.WithCancel(app.globalCtx)
219 app.eventsCtx = ctx
220 setupSubscriber(ctx, app.serviceEventsWG, "sessions", app.Sessions.Subscribe, app.events)
221 setupSubscriber(ctx, app.serviceEventsWG, "messages", app.Messages.Subscribe, app.events)
222 setupSubscriber(ctx, app.serviceEventsWG, "permissions", app.Permissions.Subscribe, app.events)
223 setupSubscriber(ctx, app.serviceEventsWG, "permissions-notifications", app.Permissions.SubscribeNotifications, app.events)
224 setupSubscriber(ctx, app.serviceEventsWG, "history", app.History.Subscribe, app.events)
225 setupSubscriber(ctx, app.serviceEventsWG, "mcp", agent.SubscribeMCPEvents, app.events)
226 setupSubscriber(ctx, app.serviceEventsWG, "lsp", SubscribeLSPEvents, app.events)
227 cleanupFunc := func() error {
228 cancel()
229 app.serviceEventsWG.Wait()
230 return nil
231 }
232 app.cleanupFuncs = append(app.cleanupFuncs, cleanupFunc)
233}
234
235func setupSubscriber[T any](
236 ctx context.Context,
237 wg *sync.WaitGroup,
238 name string,
239 subscriber func(context.Context) <-chan pubsub.Event[T],
240 outputCh chan<- tea.Msg,
241) {
242 wg.Go(func() {
243 subCh := subscriber(ctx)
244 for {
245 select {
246 case event, ok := <-subCh:
247 if !ok {
248 slog.Debug("subscription channel closed", "name", name)
249 return
250 }
251 var msg tea.Msg = event
252 select {
253 case outputCh <- msg:
254 case <-time.After(2 * time.Second):
255 slog.Warn("message dropped due to slow consumer", "name", name)
256 case <-ctx.Done():
257 slog.Debug("subscription cancelled", "name", name)
258 return
259 }
260 case <-ctx.Done():
261 slog.Debug("subscription cancelled", "name", name)
262 return
263 }
264 }
265 })
266}
267
268func (app *App) InitCoderAgent() error {
269 coderAgentCfg := app.config.Agents["coder"]
270 if coderAgentCfg.ID == "" {
271 return fmt.Errorf("coder agent configuration is missing")
272 }
273 var err error
274 app.CoderAgent, err = agent.NewAgent(
275 app.globalCtx,
276 coderAgentCfg,
277 app.Permissions,
278 app.Sessions,
279 app.Messages,
280 app.History,
281 app.LSPClients,
282 )
283 if err != nil {
284 slog.Error("Failed to create coder agent", "err", err)
285 return err
286 }
287
288 // Add MCP client cleanup to shutdown process
289 app.cleanupFuncs = append(app.cleanupFuncs, agent.CloseMCPClients)
290
291 setupSubscriber(app.eventsCtx, app.serviceEventsWG, "coderAgent", app.CoderAgent.Subscribe, app.events)
292 return nil
293}
294
295// Subscribe sends events to the TUI as tea.Msgs.
296func (app *App) Subscribe(program *tea.Program) {
297 defer log.RecoverPanic("app.Subscribe", func() {
298 slog.Info("TUI subscription panic: attempting graceful shutdown")
299 program.Quit()
300 })
301
302 app.tuiWG.Add(1)
303 tuiCtx, tuiCancel := context.WithCancel(app.globalCtx)
304 app.cleanupFuncs = append(app.cleanupFuncs, func() error {
305 slog.Debug("Cancelling TUI message handler")
306 tuiCancel()
307 app.tuiWG.Wait()
308 return nil
309 })
310 defer app.tuiWG.Done()
311
312 for {
313 select {
314 case <-tuiCtx.Done():
315 slog.Debug("TUI message handler shutting down")
316 return
317 case msg, ok := <-app.events:
318 if !ok {
319 slog.Debug("TUI message channel closed")
320 return
321 }
322 program.Send(msg)
323 }
324 }
325}
326
327// Shutdown performs a graceful shutdown of the application.
328func (app *App) Shutdown() {
329 if app.CoderAgent != nil {
330 app.CoderAgent.CancelAll()
331 }
332
333 for cancel := range app.watcherCancelFuncs.Seq() {
334 cancel()
335 }
336
337 // Wait for all LSP watchers to finish.
338 app.lspWatcherWG.Wait()
339
340 // Get all LSP clients.
341 app.clientsMutex.RLock()
342 clients := make(map[string]*lsp.Client, len(app.LSPClients))
343 maps.Copy(clients, app.LSPClients)
344 app.clientsMutex.RUnlock()
345
346 // Shutdown all LSP clients.
347 for name, client := range clients {
348 shutdownCtx, cancel := context.WithTimeout(app.globalCtx, 5*time.Second)
349 if err := client.Shutdown(shutdownCtx); err != nil {
350 slog.Error("Failed to shutdown LSP client", "name", name, "error", err)
351 }
352 cancel()
353 }
354
355 // Call call cleanup functions.
356 for _, cleanup := range app.cleanupFuncs {
357 if cleanup != nil {
358 if err := cleanup(); err != nil {
359 slog.Error("Failed to cleanup app properly on shutdown", "error", err)
360 }
361 }
362 }
363}