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feat(proxy): add failed connection count stats

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For the summary log and for Prometheus metrics.

Log output example:

> In the last 1h0m0s, there were 7 completed successful connections. 2 connections failed. Traffic Relayed ↓ 321 KB (0.10 KB/s), ↑ 123 KB (0.05 KB/s).
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WofWca 2025-02-21 02:00:47 +04:00 • committed by Shelikhoo
parent 5ef4761968
commit 583178f4f2
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5 changed files with 53 additions and 13 deletions
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21
common/event/interface.go
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@ -75,6 +75,8 @@ func (e EventOnProxyClientConnected) String() string {
return fmt.Sprintf("client connected")
}
// The connection with the client has now been closed,
// after getting successfully established.
type EventOnProxyConnectionOver struct {
SnowflakeEvent
Country string
@ -84,17 +86,30 @@ func (e EventOnProxyConnectionOver) String() string {
return fmt.Sprintf("Proxy connection closed")
}
// Rendezvous with a client succeeded,
// but a data channel has not been created.
type EventOnProxyConnectionFailed struct {
SnowflakeEvent
}
func (e EventOnProxyConnectionFailed) String() string {
return "Failed to connect to the client"
}
type EventOnProxyStats struct {
SnowflakeEvent
ConnectionCount int
// Completed successful connections.
ConnectionCount int
// Connections that failed to establish.
FailedConnectionCount uint
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 (%.2f %v%s), ↑ %v %v (%.2f %v%s).",
e.SummaryInterval.String(), e.ConnectionCount,
statString := fmt.Sprintf("In the last %v, there were %v completed successful connections. %v connections failed to establish. Traffic Relayed ↓ %v %v (%.2f %v%s), ↑ %v %v (%.2f %v%s).",
e.SummaryInterval.String(), e.ConnectionCount, e.FailedConnectionCount,
e.InboundBytes, e.InboundUnit, float64(e.InboundBytes)/e.SummaryInterval.Seconds(), e.InboundUnit, "/s",
e.OutboundBytes, e.OutboundUnit, float64(e.OutboundBytes)/e.SummaryInterval.Seconds(), e.OutboundUnit, "/s")
return statString