veryroundbird.house
1package spindle
2
3import (
4 "context"
5 "encoding/json"
6 "fmt"
7 "net/http"
8 "strconv"
9 "time"
10
11 "tangled.sh/tangled.sh/core/spindle/engine"
12 "tangled.sh/tangled.sh/core/spindle/models"
13
14 "github.com/go-chi/chi/v5"
15 "github.com/gorilla/websocket"
16 "github.com/hpcloud/tail"
17)
18
19var upgrader = websocket.Upgrader{
20 ReadBufferSize: 1024,
21 WriteBufferSize: 1024,
22}
23
24func (s *Spindle) Events(w http.ResponseWriter, r *http.Request) {
25 l := s.l.With("handler", "Events")
26 l.Debug("received new connection")
27
28 conn, err := upgrader.Upgrade(w, r, nil)
29 if err != nil {
30 l.Error("websocket upgrade failed", "err", err)
31 w.WriteHeader(http.StatusInternalServerError)
32 return
33 }
34 defer conn.Close()
35 l.Debug("upgraded http to wss")
36
37 ch := s.n.Subscribe()
38 defer s.n.Unsubscribe(ch)
39
40 ctx, cancel := context.WithCancel(r.Context())
41 defer cancel()
42 go func() {
43 for {
44 if _, _, err := conn.NextReader(); err != nil {
45 l.Error("failed to read", "err", err)
46 cancel()
47 return
48 }
49 }
50 }()
51
52 defaultCursor := time.Now().UnixNano()
53 cursorStr := r.URL.Query().Get("cursor")
54 cursor, err := strconv.ParseInt(cursorStr, 10, 64)
55 if err != nil {
56 l.Error("empty or invalid cursor", "invalidCursor", cursorStr, "default", defaultCursor)
57 }
58 if cursor == 0 {
59 cursor = defaultCursor
60 }
61
62 // complete backfill first before going to live data
63 l.Debug("going through backfill", "cursor", cursor)
64 if err := s.streamPipelines(conn, &cursor); err != nil {
65 l.Error("failed to backfill", "err", err)
66 return
67 }
68
69 for {
70 // wait for new data or timeout
71 select {
72 case <-ctx.Done():
73 l.Debug("stopping stream: client closed connection")
74 return
75 case <-ch:
76 // we have been notified of new data
77 l.Debug("going through live data", "cursor", cursor)
78 if err := s.streamPipelines(conn, &cursor); err != nil {
79 l.Error("failed to stream", "err", err)
80 return
81 }
82 case <-time.After(30 * time.Second):
83 // send a keep-alive
84 l.Debug("sent keepalive")
85 if err = conn.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(time.Second)); err != nil {
86 l.Error("failed to write control", "err", err)
87 }
88 }
89 }
90}
91
92func (s *Spindle) Logs(w http.ResponseWriter, r *http.Request) {
93 wid, err := getWorkflowID(r)
94 if err != nil {
95 http.Error(w, err.Error(), http.StatusBadRequest)
96 return
97 }
98
99 l := s.l.With("handler", "Logs")
100 l = s.l.With("wid", wid)
101
102 conn, err := upgrader.Upgrade(w, r, nil)
103 if err != nil {
104 l.Error("websocket upgrade failed", "err", err)
105 http.Error(w, "failed to upgrade", http.StatusInternalServerError)
106 return
107 }
108 defer conn.Close()
109 l.Debug("upgraded http to wss")
110
111 ctx, cancel := context.WithCancel(r.Context())
112 defer cancel()
113
114 go func() {
115 for {
116 if _, _, err := conn.NextReader(); err != nil {
117 l.Debug("client disconnected", "err", err)
118 cancel()
119 return
120 }
121 }
122 }()
123
124 if err := s.streamLogsFromDisk(ctx, conn, wid); err != nil {
125 l.Error("log stream failed", "err", err)
126 }
127 l.Debug("logs connection closed")
128}
129
130func (s *Spindle) streamLogsFromDisk(ctx context.Context, conn *websocket.Conn, wid models.WorkflowId) error {
131 filePath := engine.LogFilePath(s.cfg.Pipelines.LogDir, wid)
132
133 config := tail.Config{
134 Follow: true,
135 ReOpen: true,
136 MustExist: false,
137 Location: &tail.SeekInfo{Offset: 0, Whence: 0},
138 Logger: tail.DiscardingLogger,
139 }
140
141 t, err := tail.TailFile(filePath, config)
142 if err != nil {
143 return fmt.Errorf("failed to tail log file: %w", err)
144 }
145 defer t.Stop()
146
147 for {
148 select {
149 case <-ctx.Done():
150 return ctx.Err()
151 case line := <-t.Lines:
152 if line == nil {
153 return fmt.Errorf("tail channel closed unexpectedly")
154 }
155
156 if line.Err != nil {
157 return fmt.Errorf("error tailing log file: %w", line.Err)
158 }
159
160 if err := conn.WriteMessage(websocket.TextMessage, []byte(line.Text)); err != nil {
161 return fmt.Errorf("failed to write to websocket: %w", err)
162 }
163 }
164 }
165}
166
167func (s *Spindle) streamPipelines(conn *websocket.Conn, cursor *int64) error {
168 events, err := s.db.GetEvents(*cursor)
169 if err != nil {
170 s.l.Debug("err", "err", err)
171 return err
172 }
173 s.l.Debug("ops", "ops", events)
174
175 for _, event := range events {
176 // first extract the inner json into a map
177 var eventJson map[string]any
178 err := json.Unmarshal([]byte(event.EventJson), &eventJson)
179 if err != nil {
180 s.l.Error("failed to unmarshal event", "err", err)
181 return err
182 }
183
184 jsonMsg, err := json.Marshal(map[string]any{
185 "rkey": event.Rkey,
186 "nsid": event.Nsid,
187 "event": eventJson,
188 })
189 if err != nil {
190 s.l.Error("failed to marshal record", "err", err)
191 return err
192 }
193
194 if err := conn.WriteMessage(websocket.TextMessage, jsonMsg); err != nil {
195 s.l.Debug("err", "err", err)
196 return err
197 }
198 *cursor = event.Created
199 }
200
201 return nil
202}
203
204func getWorkflowID(r *http.Request) (models.WorkflowId, error) {
205 knot := chi.URLParam(r, "knot")
206 rkey := chi.URLParam(r, "rkey")
207 name := chi.URLParam(r, "name")
208
209 if knot == "" || rkey == "" || name == "" {
210 return models.WorkflowId{}, fmt.Errorf("missing required parameters")
211 }
212
213 return models.WorkflowId{
214 PipelineId: models.PipelineId{
215 Knot: knot,
216 Rkey: rkey,
217 },
218 Name: name,
219 }, nil
220}