152 lines
3.6 KiB
Go
152 lines
3.6 KiB
Go
package connection
|
|
|
|
import (
|
|
"fmt"
|
|
"net/url"
|
|
"strings"
|
|
|
|
tunnelpogs "github.com/cloudflare/cloudflared/tunnelrpc/pogs"
|
|
|
|
"github.com/rs/zerolog"
|
|
)
|
|
|
|
const (
|
|
LogFieldLocation = "location"
|
|
observerChannelBufferSize = 16
|
|
)
|
|
|
|
type Observer struct {
|
|
log *zerolog.Logger
|
|
logTransport *zerolog.Logger
|
|
metrics *tunnelMetrics
|
|
tunnelEventChan chan Event
|
|
uiEnabled bool
|
|
addSinkChan chan EventSink
|
|
}
|
|
|
|
type EventSink interface {
|
|
OnTunnelEvent(event Event)
|
|
}
|
|
|
|
func NewObserver(log, logTransport *zerolog.Logger, uiEnabled bool) *Observer {
|
|
o := &Observer{
|
|
log: log,
|
|
logTransport: logTransport,
|
|
metrics: newTunnelMetrics(),
|
|
uiEnabled: uiEnabled,
|
|
tunnelEventChan: make(chan Event, observerChannelBufferSize),
|
|
addSinkChan: make(chan EventSink, observerChannelBufferSize),
|
|
}
|
|
go o.dispatchEvents()
|
|
return o
|
|
}
|
|
|
|
func (o *Observer) RegisterSink(sink EventSink) {
|
|
o.addSinkChan <- sink
|
|
}
|
|
|
|
func (o *Observer) logServerInfo(connIndex uint8, location, msg string) {
|
|
o.sendEvent(Event{Index: connIndex, EventType: Connected, Location: location})
|
|
o.log.Info().
|
|
Uint8(LogFieldConnIndex, connIndex).
|
|
Str(LogFieldLocation, location).
|
|
Msg(msg)
|
|
o.metrics.registerServerLocation(uint8ToString(connIndex), location)
|
|
}
|
|
|
|
func (o *Observer) logTrialHostname(registration *tunnelpogs.TunnelRegistration) error {
|
|
// Print out the user's trial zone URL in a nice box (if they requested and got one and UI flag is not set)
|
|
if !o.uiEnabled {
|
|
if registrationURL, err := url.Parse(registration.Url); err == nil {
|
|
for _, line := range asciiBox(trialZoneMsg(registrationURL.String()), 2) {
|
|
o.log.Info().Msg(line)
|
|
}
|
|
} else {
|
|
o.log.Error().Msg("Failed to connect tunnel, please try again.")
|
|
return fmt.Errorf("empty URL in response from Cloudflare edge")
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Print out the given lines in a nice ASCII box.
|
|
func asciiBox(lines []string, padding int) (box []string) {
|
|
maxLen := maxLen(lines)
|
|
spacer := strings.Repeat(" ", padding)
|
|
|
|
border := "+" + strings.Repeat("-", maxLen+(padding*2)) + "+"
|
|
|
|
box = append(box, border)
|
|
for _, line := range lines {
|
|
box = append(box, "|"+spacer+line+strings.Repeat(" ", maxLen-len(line))+spacer+"|")
|
|
}
|
|
box = append(box, border)
|
|
return
|
|
}
|
|
|
|
func maxLen(lines []string) int {
|
|
max := 0
|
|
for _, line := range lines {
|
|
if len(line) > max {
|
|
max = len(line)
|
|
}
|
|
}
|
|
return max
|
|
}
|
|
|
|
func trialZoneMsg(url string) []string {
|
|
return []string{
|
|
"Your free tunnel has started! Visit it:",
|
|
" " + url,
|
|
}
|
|
}
|
|
|
|
func (o *Observer) sendRegisteringEvent(connIndex uint8) {
|
|
o.sendEvent(Event{Index: connIndex, EventType: RegisteringTunnel})
|
|
}
|
|
|
|
func (o *Observer) sendConnectedEvent(connIndex uint8, location string) {
|
|
o.sendEvent(Event{Index: connIndex, EventType: Connected, Location: location})
|
|
}
|
|
|
|
func (o *Observer) sendURL(url string) {
|
|
o.sendEvent(Event{EventType: SetURL, URL: url})
|
|
}
|
|
|
|
func (o *Observer) SendReconnect(connIndex uint8) {
|
|
o.sendEvent(Event{Index: connIndex, EventType: Reconnecting})
|
|
}
|
|
|
|
func (o *Observer) SendDisconnect(connIndex uint8) {
|
|
o.sendEvent(Event{Index: connIndex, EventType: Disconnected})
|
|
}
|
|
|
|
func (o *Observer) sendEvent(e Event) {
|
|
select {
|
|
case o.tunnelEventChan <- e:
|
|
break
|
|
default:
|
|
o.log.Warn().Msg("observer channel buffer is full")
|
|
}
|
|
}
|
|
|
|
func (o *Observer) dispatchEvents() {
|
|
var sinks []EventSink
|
|
for {
|
|
select {
|
|
case sink := <-o.addSinkChan:
|
|
sinks = append(sinks, sink)
|
|
case evt := <-o.tunnelEventChan:
|
|
for _, sink := range sinks {
|
|
sink.OnTunnelEvent(evt)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
type EventSinkFunc func(event Event)
|
|
|
|
func (f EventSinkFunc) OnTunnelEvent(event Event) {
|
|
f(event)
|
|
}
|