commit fee887e33ddb2a4f4a95fa2e8532369ab5220075 · veryroundbird.house/core

+93

knotserver/events.go

···

       1
       +
       package knotserver

     

       2
       +
       

     

       3
       +
       import (

     

       4
       +
       	"context"

     

       5
       +
       	"net/http"

     

       6
       +
       	"time"

     

       7
       +
       

     

       8
       +
       	"github.com/gorilla/websocket"

     

       9
       +
       )

     

       10
       +
       

     

       11
       +
       var upgrader = websocket.Upgrader{

     

       12
       +
       	ReadBufferSize:  1024,

     

       13
       +
       	WriteBufferSize: 1024,

     

       14
       +
       }

     

       15
       +
       

     

       16
       +
       func (h *Handle) OpLog(w http.ResponseWriter, r *http.Request) {

     

       17
       +
       	l := h.l.With("handler", "OpLog")

     

       18
       +
       	l.Info("received new connection")

     

       19
       +
       

     

       20
       +
       	conn, err := upgrader.Upgrade(w, r, nil)

     

       21
       +
       	if err != nil {

     

       22
       +
       		l.Error("websocket upgrade failed", "err", err)

     

       23
       +
       		w.WriteHeader(http.StatusInternalServerError)

     

       24
       +
       		return

     

       25
       +
       	}

     

       26
       +
       	defer conn.Close()

     

       27
       +
       	l.Info("upgraded http to wss")

     

       28
       +
       

     

       29
       +
       	ch := h.n.Subscribe()

     

       30
       +
       	defer h.n.Unsubscribe(ch)

     

       31
       +
       

     

       32
       +
       	ctx, cancel := context.WithCancel(r.Context())

     

       33
       +
       	defer cancel()

     

       34
       +
       	go func() {

     

       35
       +
       		for {

     

       36
       +
       			if _, _, err := conn.NextReader(); err != nil {

     

       37
       +
       				l.Error("failed to read", "err", err)

     

       38
       +
       				cancel()

     

       39
       +
       				return

     

       40
       +
       			}

     

       41
       +
       		}

     

       42
       +
       	}()

     

       43
       +
       

     

       44
       +
       	cursor := ""

     

       45
       +
       

     

       46
       +
       	// complete backfill first before going to live data

     

       47
       +
       	l.Info("going through backfill", "cursor", cursor)

     

       48
       +
       	if err := h.streamOps(conn, &cursor); err != nil {

     

       49
       +
       		l.Error("failed to backfill", "err", err)

     

       50
       +
       		return

     

       51
       +
       	}

     

       52
       +
       

     

       53
       +
       	for {

     

       54
       +
       		// wait for new data or timeout

     

       55
       +
       		select {

     

       56
       +
       		case <-ctx.Done():

     

       57
       +
       			l.Info("stopping stream: client closed connection")

     

       58
       +
       			return

     

       59
       +
       		case <-ch:

     

       60
       +
       			// we have been notified of new data

     

       61
       +
       			l.Info("going through live data", "cursor", cursor)

     

       62
       +
       			if err := h.streamOps(conn, &cursor); err != nil {

     

       63
       +
       				l.Error("failed to stream", "err", err)

     

       64
       +
       				return

     

       65
       +
       			}

     

       66
       +
       		case <-time.After(30 * time.Second):

     

       67
       +
       			// send a keep-alive

     

       68
       +
       			l.Info("sent keepalive")

     

       69
       +
       			if err = conn.WriteControl(websocket.PingMessage, []byte{}, time.Now().Add(time.Second)); err != nil {

     

       70
       +
       				l.Error("failed to write control", "err", err)

     

       71
       +
       			}

     

       72
       +
       		}

     

       73
       +
       	}

     

       74
       +
       }

     

       75
       +
       

     

       76
       +
       func (h *Handle) streamOps(conn *websocket.Conn, cursor *string) error {

     

       77
       +
       	ops, err := h.db.GetOps(*cursor)

     

       78
       +
       	if err != nil {

     

       79
       +
       		h.l.Debug("err", "err", err)

     

       80
       +
       		return err

     

       81
       +
       	}

     

       82
       +
       	h.l.Debug("ops", "ops", ops)

     

       83
       +
       

     

       84
       +
       	for _, op := range ops {

     

       85
       +
       		if err := conn.WriteJSON(op); err != nil {

     

       86
       +
       			h.l.Debug("err", "err", err)

     

       87
       +
       			return err

     

       88
       +
       		}

     

       89
       +
       		*cursor = op.Tid

     

       90
       +
       	}

     

       91
       +
       

     

       92
       +
       	return nil

     

       93
       +
       }

knotserver/handler.go

···

       148
        
       		r.Put("/add", h.AddMember)

     

       149
        
       	})

     

       150
        
       

     

       0
        
       
     

       0
        
       
     

       0
        
       
     

       151
        
       	// Initialize the knot with an owner and public key.

     

       152
        
       	r.With(h.VerifySignature).Post("/init", h.Init)

     

       153

···

       148
        
       		r.Put("/add", h.AddMember)

     

       149
        
       	})

     

       150
        
       

     

       151
       +
       	// Socket that streams git oplogs

     

       152
       +
       	r.Get("/oplog", h.OpLog)

     

       153
       +
       

     

       154
        
       	// Initialize the knot with an owner and public key.

     

       155
        
       	r.With(h.VerifySignature).Post("/init", h.Init)

     

       156