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