commit fee887e33ddb2a4f4a95fa2e8532369ab5220075 · kot.pink/core

+93

knotserver/events.go

···

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       package knotserver

     

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       import (

     

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       	"context"

     

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       	"net/http"

     

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       	"time"

     

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       	"github.com/gorilla/websocket"

     

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       )

     

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       var upgrader = websocket.Upgrader{

     

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       	ReadBufferSize:  1024,

     

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       	WriteBufferSize: 1024,

     

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       }

     

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

     

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

     

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       	l.Info("received new connection")

     

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

     

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       	if err != nil {

     

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

     

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       		w.WriteHeader(http.StatusInternalServerError)

     

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       		return

     

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       	}

     

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       	defer conn.Close()

     

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       	l.Info("upgraded http to wss")

     

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       	ch := h.n.Subscribe()

     

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       	defer h.n.Unsubscribe(ch)

     

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

     

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       	defer cancel()

     

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       	go func() {

     

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       		for {

     

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

     

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

     

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       				cancel()

     

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       				return

     

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       			}

     

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       		}

     

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       	}()

     

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       	cursor := ""

     

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       	// complete backfill first before going to live data

     

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

     

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

     

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

     

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       		return

     

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       	}

     

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       	for {

     

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       		// wait for new data or timeout

     

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       		select {

     

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       		case <-ctx.Done():

     

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

     

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       			return

     

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       		case <-ch:

     

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       			// we have been notified of new data

     

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

     

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

     

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

     

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       				return

     

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       			}

     

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

     

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       			// send a keep-alive

     

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       			l.Info("sent keepalive")

     

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

     

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

     

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       			}

     

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       		}

     

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       	}

     

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       }

     

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

     

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

     

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       	if err != nil {

     

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

     

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       		return err

     

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       	}

     

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

     

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       	for _, op := range ops {

     

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

     

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

     

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       			return err

     

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       		}

     

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       		*cursor = op.Tid

     

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       	}

     

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       	return nil

     

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       }

knotserver/handler.go

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

     

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       	})

     

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       	// Socket that streams git oplogs

     

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

     

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

     

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

     

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