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server.go
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server.go
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// Copyright (C) 2019-2022, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package pubsub
import (
"net/http"
"sync"
"time"
"github.com/gorilla/websocket"
"go.uber.org/zap"
"github.com/MetalBlockchain/metalgo/utils/logging"
"github.com/MetalBlockchain/metalgo/utils/set"
"github.com/MetalBlockchain/metalgo/utils/units"
)
const (
// Size of the ws read buffer
readBufferSize = units.KiB
// Size of the ws write buffer
writeBufferSize = units.KiB
// Time allowed to write a message to the peer.
writeWait = 10 * time.Second
// Time allowed to read the next pong message from the peer.
pongWait = 60 * time.Second
// Send pings to peer with this period. Must be less than pongWait.
pingPeriod = (pongWait * 9) / 10
// Maximum message size allowed from peer.
maxMessageSize = 10 * units.KiB // bytes
// Maximum number of pending messages to send to a peer.
maxPendingMessages = 1024 // messages
// MaxBytes the max number of bytes for a filter
MaxBytes = 1 * units.MiB
// MaxAddresses the max number of addresses allowed
MaxAddresses = 10000
)
type errorMsg struct {
Error string `json:"error"`
}
var upgrader = websocket.Upgrader{
ReadBufferSize: readBufferSize,
WriteBufferSize: writeBufferSize,
CheckOrigin: func(*http.Request) bool {
return true
},
}
// Server maintains the set of active clients and sends messages to the clients.
type Server struct {
log logging.Logger
lock sync.RWMutex
// conns a list of all our connections
conns set.Set[*connection]
// subscribedConnections the connections that have activated subscriptions
subscribedConnections *connections
}
func New(log logging.Logger) *Server {
return &Server{
log: log,
subscribedConnections: newConnections(),
}
}
func (s *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) {
wsConn, err := upgrader.Upgrade(w, r, nil)
if err != nil {
s.log.Debug("failed to upgrade",
zap.Error(err),
)
return
}
conn := &connection{
s: s,
conn: wsConn,
send: make(chan interface{}, maxPendingMessages),
fp: NewFilterParam(),
active: 1,
}
s.addConnection(conn)
}
func (s *Server) Publish(parser Filterer) {
conns := s.subscribedConnections.Conns()
toNotify, msg := parser.Filter(conns)
for i, shouldNotify := range toNotify {
if !shouldNotify {
continue
}
conn := conns[i].(*connection)
if !conn.Send(msg) {
s.log.Verbo("dropping message to subscribed connection due to too many pending messages")
}
}
}
func (s *Server) addConnection(conn *connection) {
s.lock.Lock()
defer s.lock.Unlock()
s.conns.Add(conn)
go conn.writePump()
go conn.readPump()
}
func (s *Server) removeConnection(conn *connection) {
s.subscribedConnections.Remove(conn)
s.lock.Lock()
defer s.lock.Unlock()
s.conns.Remove(conn)
}