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package event
import (
"fmt"
"time"
"github.com/pion/webrtc/v3"
"gitlab.torproject.org/tpo/anti-censorship/pluggable-transports/ptutil/safelog"
)
type SnowflakeEvent interface {
IsSnowflakeEvent()
String() string
}
type EventOnOfferCreated struct {
SnowflakeEvent
WebRTCLocalDescription *webrtc.SessionDescription
Error error
}
func (e EventOnOfferCreated) String() string {
if e.Error != nil {
scrubbed := safelog.Scrub([]byte(e.Error.Error()))
return fmt.Sprintf("offer creation failure %s", scrubbed)
}
return "offer created"
}
type EventOnBrokerRendezvous struct {
SnowflakeEvent
WebRTCRemoteDescription *webrtc.SessionDescription
Error error
}
func (e EventOnBrokerRendezvous) String() string {
if e.Error != nil {
scrubbed := safelog.Scrub([]byte(e.Error.Error()))
return fmt.Sprintf("broker failure %s", scrubbed)
}
return "broker rendezvous peer received"
}
type EventOnSnowflakeConnected struct {
SnowflakeEvent
}
func (e EventOnSnowflakeConnected) String() string {
return "connected"
}
type EventOnSnowflakeConnectionFailed struct {
SnowflakeEvent
Error error
}
func (e EventOnSnowflakeConnectionFailed) String() string {
scrubbed := safelog.Scrub([]byte(e.Error.Error()))
return fmt.Sprintf("trying a new proxy: %s", scrubbed)
}
type EventOnProxyStarting struct {
SnowflakeEvent
}
func (e EventOnProxyStarting) String() string {
return "Proxy starting"
}
type EventOnProxyConnectionOver struct {
SnowflakeEvent
InboundTraffic int64
OutboundTraffic int64
}
func (e EventOnProxyConnectionOver) String() string {
return fmt.Sprintf("Proxy connection closed")
}
type EventOnProxyStats struct {
SnowflakeEvent
ConnectionCount int
InboundBytes, OutboundBytes int64
InboundUnit, OutboundUnit string
SummaryInterval time.Duration
}
func (e EventOnProxyStats) String() string {
statString := fmt.Sprintf("In the last %v, there were %v completed connections. Traffic Relayed ↓ %v %v, ↑ %v %v.",
e.SummaryInterval.String(), e.ConnectionCount, e.InboundBytes, e.InboundUnit, e.OutboundBytes, e.OutboundUnit)
return statString
}
type EventOnCurrentNATTypeDetermined struct {
SnowflakeEvent
CurNATType string
}
func (e EventOnCurrentNATTypeDetermined) String() string {
return fmt.Sprintf("NAT type: %v", e.CurNATType)
}
type SnowflakeEventReceiver interface {
// OnNewSnowflakeEvent notify receiver about a new event
// This method MUST not block
OnNewSnowflakeEvent(event SnowflakeEvent)
}
type SnowflakeEventDispatcher interface {
SnowflakeEventReceiver
// AddSnowflakeEventListener allow receiver(s) to receive event notification
// when OnNewSnowflakeEvent is called on the dispatcher.
// Every event listener added will be called when an event is received by the dispatcher.
// The order each listener is called is undefined.
AddSnowflakeEventListener(receiver SnowflakeEventReceiver)
RemoveSnowflakeEventListener(receiver SnowflakeEventReceiver)
}
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