Noah Petherbridge
09da9fa23d
To help alleviate rocky chat server reboots, WhoList messages will be
withheld in the first 15 seconds from server start.
When a lot of chatters were online during a reboot (e.g. 50 or more),
they would all try and reconnect after 5 seconds and each login was
broadcasting Who List updates to everybody else logged in. With the
surge of logins in a short time, these WhoList messages would fill up
the buffers of each recipient, kicking them offline for being too slow
to keep up with messages; only for that recipient to reconnect again.
The average user may have experienced 2 or 3 disconnects when the chat
server reboots.
To help alleviate the spam of messages being sent out:
* Presence messages are withheld for the first 30 seconds ("has joined
the room" notifications)
* Now, WhoList messages are withheld for the first 15 seconds.
After 16 seconds of uptime, the server will send a WhoList to everybody
currently online to catch them up.
To accommodate this, the front-end will show a spinner and say "Waiting
for Who List..." when the page is connected but no WhoList has been
received yet. Under normal operation, this spinner won't be visible
beyond a brief moment as a WhoList is normally sent upon joining the
chat.
93 lines
2.8 KiB
Go
93 lines
2.8 KiB
Go
package barertc
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import (
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"io"
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"net/http"
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"sync"
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"time"
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"git.kirsle.net/apps/barertc/pkg/config"
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"git.kirsle.net/apps/barertc/pkg/log"
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"git.kirsle.net/apps/barertc/pkg/models"
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)
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// Server is the primary back-end server struct for BareRTC, see main.go
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type Server struct {
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// Timestamp when the server started.
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upSince time.Time
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// HTTP router.
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mux *http.ServeMux
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// Max number of messages we'll buffer for a subscriber
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subscriberMessageBuffer int
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// Connected WebSocket subscribers.
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subscribersMu sync.RWMutex
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subscribers map[*Subscriber]struct{}
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// Cached filehandles for channel logging.
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logfh map[string]io.WriteCloser
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}
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// NewServer initializes the Server.
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func NewServer() *Server {
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return &Server{
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subscriberMessageBuffer: 32,
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subscribers: make(map[*Subscriber]struct{}),
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}
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}
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// Setup the server: configure HTTP routes, etc.
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func (s *Server) Setup() error {
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// Enable the SQLite database for DM history?
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if config.Current.DirectMessageHistory.Enabled {
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if err := models.Initialize(config.Current.DirectMessageHistory.SQLiteDatabase); err != nil {
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log.Error("Error initializing SQLite database: %s", err)
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}
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}
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var mux = http.NewServeMux()
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mux.Handle("/", IndexPage())
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mux.Handle("/about", AboutPage())
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mux.Handle("/logout", LogoutPage())
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mux.Handle("/ws", s.WebSocket())
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mux.Handle("/poll", s.PollingAPI())
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mux.Handle("/api/statistics", s.Statistics())
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mux.Handle("/api/blocklist", s.BlockList())
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mux.Handle("/api/block/now", s.BlockNow())
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mux.Handle("/api/disconnect/now", s.DisconnectNow())
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mux.Handle("/api/authenticate", s.Authenticate())
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mux.Handle("/api/shutdown", s.ShutdownAPI())
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mux.Handle("/api/profile", s.UserProfile())
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mux.Handle("/api/message/history", s.MessageHistory())
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mux.Handle("/api/message/usernames", s.MessageUsernameHistory())
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mux.Handle("/api/message/clear", s.ClearMessages())
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mux.Handle("/assets/", http.StripPrefix("/assets/", http.FileServer(http.Dir("dist/assets"))))
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mux.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("dist/static"))))
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s.mux = mux
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return nil
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}
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// ListenAndServe starts the web server.
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func (s *Server) ListenAndServe(address string) error {
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// Run the polling user idle kicker.
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s.upSince = time.Now()
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go s.KickIdlePollUsers()
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go s.sendWhoListAfterReady()
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return http.ListenAndServe(address, s.mux)
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}
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// Send first WhoList update 15 seconds after the server reboots. This is in case a lot of chatters
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// are online during a reboot: we avoid broadcasting Presence for 30 seconds and WhoList for 15 to
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// reduce chatter and avoid kicking clients offline repeatedly for filling up their message buffer
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// as everyone rejoins the chat all at once.
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func (s *Server) sendWhoListAfterReady() {
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time.Sleep(16 * time.Second)
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log.Info("Up 15 seconds, sending WhoList to any online chatters")
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s.SendWhoList()
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}
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