hailey.at
1package server
2
3import (
4 "context"
5 "time"
6
7 "github.com/bluesky-social/indigo/events"
8 "github.com/bluesky-social/indigo/lex/util"
9 "github.com/btcsuite/websocket"
10 "github.com/haileyok/cocoon/metrics"
11 "github.com/labstack/echo/v4"
12)
13
14func (s *Server) handleSyncSubscribeRepos(e echo.Context) error {
15 ctx, cancel := context.WithCancel(e.Request().Context())
16 defer cancel()
17
18 logger := s.logger.With("component", "subscribe-repos-websocket")
19
20 conn, err := websocket.Upgrade(e.Response().Writer, e.Request(), e.Response().Header(), 1<<10, 1<<10)
21 if err != nil {
22 logger.Error("unable to establish websocket with relay", "err", err)
23 return err
24 }
25
26 ident := e.RealIP() + "-" + e.Request().UserAgent()
27 logger = logger.With("ident", ident)
28 logger.Info("new connection established")
29
30 metrics.RelaysConnected.WithLabelValues(ident).Inc()
31 defer func() {
32 metrics.RelaysConnected.WithLabelValues(ident).Dec()
33 }()
34
35 evts, evtManCancel, err := s.evtman.Subscribe(ctx, ident, func(evt *events.XRPCStreamEvent) bool {
36 return true
37 }, nil)
38 if err != nil {
39 return err
40 }
41 defer evtManCancel()
42
43 // drop the connection whenever a subscriber disconnects from the socket, we should get errors
44 go func() {
45 for {
46 if _, _, err := conn.ReadMessage(); err != nil {
47 logger.Warn("websocket error", "err", err)
48 cancel()
49 }
50 }
51 }()
52
53 header := events.EventHeader{Op: events.EvtKindMessage}
54 for evt := range evts {
55 func() {
56 defer func() {
57 metrics.RelaySends.WithLabelValues(ident, header.MsgType).Inc()
58 }()
59
60 wc, err := conn.NextWriter(websocket.BinaryMessage)
61 if err != nil {
62 logger.Error("error writing message to relay", "err", err)
63 return
64 }
65
66 if ctx.Err() != nil {
67 logger.Error("context error", "err", err)
68 return
69 }
70
71 var obj util.CBOR
72 switch {
73 case evt.Error != nil:
74 header.Op = events.EvtKindErrorFrame
75 obj = evt.Error
76 case evt.RepoCommit != nil:
77 header.MsgType = "#commit"
78 obj = evt.RepoCommit
79 case evt.RepoIdentity != nil:
80 header.MsgType = "#identity"
81 obj = evt.RepoIdentity
82 case evt.RepoAccount != nil:
83 header.MsgType = "#account"
84 obj = evt.RepoAccount
85 case evt.RepoInfo != nil:
86 header.MsgType = "#info"
87 obj = evt.RepoInfo
88 default:
89 logger.Warn("unrecognized event kind")
90 return
91 }
92
93 if err := header.MarshalCBOR(wc); err != nil {
94 logger.Error("failed to write header to relay", "err", err)
95 return
96 }
97
98 if err := obj.MarshalCBOR(wc); err != nil {
99 logger.Error("failed to write event to relay", "err", err)
100 return
101 }
102
103 if err := wc.Close(); err != nil {
104 logger.Error("failed to flush-close our event write", "err", err)
105 return
106 }
107 }()
108 }
109
110 // we should tell the relay to request a new crawl at this point if we got disconnected
111 // use a new context since the old one might be cancelled at this point
112 go func() {
113 retryCtx, retryCancel := context.WithTimeout(context.Background(), 10*time.Second)
114 defer retryCancel()
115 if err := s.requestCrawl(retryCtx); err != nil {
116 logger.Error("error requesting crawls", "err", err)
117 }
118 }()
119
120 return nil
121}