1package server
2
3import (
4 "encoding/json"
5 "fmt"
6 "log/slog"
7
8 "github.com/charmbracelet/crush/internal/agent/notify"
9 "github.com/charmbracelet/crush/internal/agent/tools/mcp"
10 "github.com/charmbracelet/crush/internal/app"
11 "github.com/charmbracelet/crush/internal/history"
12 "github.com/charmbracelet/crush/internal/message"
13 "github.com/charmbracelet/crush/internal/permission"
14 "github.com/charmbracelet/crush/internal/proto"
15 "github.com/charmbracelet/crush/internal/pubsub"
16 "github.com/charmbracelet/crush/internal/session"
17)
18
19// wrapEvent converts a raw tea.Msg (a pubsub.Event[T] from the app
20// event fan-in) into a pubsub.Payload envelope with the correct
21// PayloadType discriminator and a proto-typed inner payload that has
22// proper JSON tags. Returns nil if the event type is unrecognized.
23func wrapEvent(ev any) *pubsub.Payload {
24 switch e := ev.(type) {
25 case pubsub.Event[app.LSPEvent]:
26 return envelope(pubsub.PayloadTypeLSPEvent, pubsub.Event[proto.LSPEvent]{
27 Type: e.Type,
28 Payload: proto.LSPEvent{
29 Type: proto.LSPEventType(e.Payload.Type),
30 Name: e.Payload.Name,
31 State: e.Payload.State,
32 Error: e.Payload.Error,
33 DiagnosticCount: e.Payload.DiagnosticCount,
34 },
35 })
36 case pubsub.Event[mcp.Event]:
37 return envelope(pubsub.PayloadTypeMCPEvent, pubsub.Event[proto.MCPEvent]{
38 Type: e.Type,
39 Payload: proto.MCPEvent{
40 Type: mcpEventTypeToProto(e.Payload.Type),
41 Name: e.Payload.Name,
42 State: proto.MCPState(e.Payload.State),
43 Error: e.Payload.Error,
44 ToolCount: e.Payload.Counts.Tools,
45 },
46 })
47 case pubsub.Event[permission.PermissionRequest]:
48 return envelope(pubsub.PayloadTypePermissionRequest, pubsub.Event[proto.PermissionRequest]{
49 Type: e.Type,
50 Payload: proto.PermissionRequest{
51 ID: e.Payload.ID,
52 SessionID: e.Payload.SessionID,
53 ToolCallID: e.Payload.ToolCallID,
54 ToolName: e.Payload.ToolName,
55 Description: e.Payload.Description,
56 Action: e.Payload.Action,
57 Path: e.Payload.Path,
58 Params: e.Payload.Params,
59 },
60 })
61 case pubsub.Event[permission.PermissionNotification]:
62 return envelope(pubsub.PayloadTypePermissionNotification, pubsub.Event[proto.PermissionNotification]{
63 Type: e.Type,
64 Payload: proto.PermissionNotification{
65 ToolCallID: e.Payload.ToolCallID,
66 Granted: e.Payload.Granted,
67 Denied: e.Payload.Denied,
68 },
69 })
70 case pubsub.Event[message.Message]:
71 return envelope(pubsub.PayloadTypeMessage, pubsub.Event[proto.Message]{
72 Type: e.Type,
73 Payload: messageToProto(e.Payload),
74 })
75 case pubsub.Event[session.Session]:
76 return envelope(pubsub.PayloadTypeSession, pubsub.Event[proto.Session]{
77 Type: e.Type,
78 Payload: sessionToProto(e.Payload),
79 })
80 case pubsub.Event[history.File]:
81 return envelope(pubsub.PayloadTypeFile, pubsub.Event[proto.File]{
82 Type: e.Type,
83 Payload: fileToProto(e.Payload),
84 })
85 case pubsub.Event[notify.Notification]:
86 return envelope(pubsub.PayloadTypeAgentEvent, pubsub.Event[proto.AgentEvent]{
87 Type: e.Type,
88 Payload: proto.AgentEvent{
89 SessionID: e.Payload.SessionID,
90 SessionTitle: e.Payload.SessionTitle,
91 Type: proto.AgentEventType(e.Payload.Type),
92 },
93 })
94 default:
95 slog.Warn("Unrecognized event type for SSE wrapping", "type", fmt.Sprintf("%T", ev))
96 return nil
97 }
98}
99
100// envelope marshals the inner event and wraps it in a pubsub.Payload.
101func envelope(payloadType pubsub.PayloadType, inner any) *pubsub.Payload {
102 raw, err := json.Marshal(inner)
103 if err != nil {
104 slog.Error("Failed to marshal event payload", "error", err)
105 return nil
106 }
107 return &pubsub.Payload{
108 Type: payloadType,
109 Payload: raw,
110 }
111}
112
113func mcpEventTypeToProto(t mcp.EventType) proto.MCPEventType {
114 switch t {
115 case mcp.EventStateChanged:
116 return proto.MCPEventStateChanged
117 case mcp.EventToolsListChanged:
118 return proto.MCPEventToolsListChanged
119 case mcp.EventPromptsListChanged:
120 return proto.MCPEventPromptsListChanged
121 case mcp.EventResourcesListChanged:
122 return proto.MCPEventResourcesListChanged
123 default:
124 return proto.MCPEventStateChanged
125 }
126}
127
128func sessionToProto(s session.Session) proto.Session {
129 return proto.Session{
130 ID: s.ID,
131 ParentSessionID: s.ParentSessionID,
132 Title: s.Title,
133 SummaryMessageID: s.SummaryMessageID,
134 MessageCount: s.MessageCount,
135 PromptTokens: s.PromptTokens,
136 CompletionTokens: s.CompletionTokens,
137 Cost: s.Cost,
138 CreatedAt: s.CreatedAt,
139 UpdatedAt: s.UpdatedAt,
140 }
141}
142
143func fileToProto(f history.File) proto.File {
144 return proto.File{
145 ID: f.ID,
146 SessionID: f.SessionID,
147 Path: f.Path,
148 Content: f.Content,
149 Version: f.Version,
150 CreatedAt: f.CreatedAt,
151 UpdatedAt: f.UpdatedAt,
152 }
153}
154
155func messageToProto(m message.Message) proto.Message {
156 msg := proto.Message{
157 ID: m.ID,
158 SessionID: m.SessionID,
159 Role: proto.MessageRole(m.Role),
160 Model: m.Model,
161 Provider: m.Provider,
162 CreatedAt: m.CreatedAt,
163 UpdatedAt: m.UpdatedAt,
164 }
165
166 for _, p := range m.Parts {
167 switch v := p.(type) {
168 case message.TextContent:
169 msg.Parts = append(msg.Parts, proto.TextContent{Text: v.Text})
170 case message.ReasoningContent:
171 msg.Parts = append(msg.Parts, proto.ReasoningContent{
172 Thinking: v.Thinking,
173 Signature: v.Signature,
174 StartedAt: v.StartedAt,
175 FinishedAt: v.FinishedAt,
176 })
177 case message.ToolCall:
178 msg.Parts = append(msg.Parts, proto.ToolCall{
179 ID: v.ID,
180 Name: v.Name,
181 Input: v.Input,
182 Finished: v.Finished,
183 })
184 case message.ToolResult:
185 msg.Parts = append(msg.Parts, proto.ToolResult{
186 ToolCallID: v.ToolCallID,
187 Name: v.Name,
188 Content: v.Content,
189 IsError: v.IsError,
190 })
191 case message.Finish:
192 msg.Parts = append(msg.Parts, proto.Finish{
193 Reason: proto.FinishReason(v.Reason),
194 Time: v.Time,
195 Message: v.Message,
196 Details: v.Details,
197 })
198 case message.ImageURLContent:
199 msg.Parts = append(msg.Parts, proto.ImageURLContent{URL: v.URL, Detail: v.Detail})
200 case message.BinaryContent:
201 msg.Parts = append(msg.Parts, proto.BinaryContent{Path: v.Path, MIMEType: v.MIMEType, Data: v.Data})
202 }
203 }
204
205 return msg
206}
207
208func messagesToProto(msgs []message.Message) []proto.Message {
209 out := make([]proto.Message, len(msgs))
210 for i, m := range msgs {
211 out[i] = messageToProto(m)
212 }
213 return out
214}