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main.go
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main.go
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package main
import (
"crypto/tls"
"fmt"
"log"
"net"
"net/http"
"os"
"os/signal"
"strconv"
"strings"
"syscall"
"time"
"github.com/prometheus/client_golang/prometheus"
"github.com/google/uuid"
"github.com/prometheus/client_golang/prometheus/promauto"
"github.com/prometheus/client_golang/prometheus/promhttp"
"github.com/rcrowley/go-metrics"
)
const RFC5424TimeOffsetNum = "2006-01-02T15:04:05.999999-07:00"
var egress = promauto.NewCounter(prometheus.CounterOpts{
Name: "syslogspinner_egress",
Help: "The total number of egressed logs",
})
var dropped = promauto.NewCounter(prometheus.CounterOpts{
Name: "syslogspinner_dropped",
Help: "The total number of dropped logs",
})
var reset = promauto.NewCounter(prometheus.CounterOpts{
Name: "syslogspinner_connections_reset",
Help: "The total number of reset connections",
})
var egressRateMinute = promauto.NewGauge(prometheus.GaugeOpts{
Name: "syslogspinner_egress_rate_minute",
Help: "egress rate",
})
var egressDuration = promauto.NewHistogram(prometheus.HistogramOpts{
Name: "syslogspinner_egress_duration",
Help: "egress rate",
})
var egressRate = metrics.NewMeter()
func main() {
logsPerSecondPerEmitter := os.Getenv("LOGS_PER_SECOND_PER_EMITTER")
ipsString := os.Getenv("IPS")
numEmitters := os.Getenv("NUM_EMITTERS")
syslogPort := os.Getenv("SYSLOG_PORT")
enableTLSEnv := os.Getenv("ENABLE_TLS")
logMsg := os.Getenv("LOG_MSG")
logsPerSecond, err := strconv.Atoi(logsPerSecondPerEmitter)
if err != nil {
log.Panic("failed to convert logs per second")
}
enableTLS, err := strconv.ParseBool(enableTLSEnv)
if err != nil {
log.Panic("failed to convert enable TLS")
}
ips := strings.Split(ipsString, ",")
ne, err := strconv.Atoi(numEmitters)
if err != nil {
log.Panic("failed to convert num emitters")
}
if logMsg == "" {
logMsg = "- just a test"
}
log.Print("Starting writers")
for i := 0; i < ne; i++ {
ip := ips[i%len(ips)]
go writeLogs(logsPerSecond, ip, syslogPort, logMsg, enableTLS)
log.Printf("Started writer for ip: %s", ip)
}
http.Handle("/metrics", promhttp.Handler())
go func() {
err = http.ListenAndServe(fmt.Sprintf(":%s", os.Getenv("PORT")), nil)
if err != nil {
log.Fatalf("Failed to start metrics server: %s", err)
}
}()
go func() {
t := time.NewTicker(time.Second)
for range t.C {
egressRateMinute.Set(egressRate.Snapshot().Rate1())
}
}()
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGTERM, syscall.SIGINT)
<-sigs
log.Println("EXITING")
}
func writeLogs(logsPerSecond int, ip, syslogPort, logMsg string, enableTLS bool) {
guid := uuid.New()
conn := connect(ip, syslogPort, enableTLS)
defer conn.Close()
fmt.Println("emitting for guid: " + guid.String())
for {
conn = emitBatch(logsPerSecond, guid, ip, syslogPort, logMsg, conn, enableTLS)
}
}
func emitBatch(batchSize int, guid uuid.UUID, ip, syslogPort, logMsg string, conn net.Conn, enableTLS bool) net.Conn {
for i := 0; i < batchSize; i++ {
msg := fmt.Sprintf("<14>1 %s test-hostname %s [MY-TASK/2] - %s \n", time.Now().Format(RFC5424TimeOffsetNum), guid, logMsg)
var err error
start := time.Now()
conn, err = writeWithRetry(conn, ip, syslogPort, fmt.Sprintf("%d %s", len([]byte(msg)), msg), enableTLS)
end := time.Now()
if err != nil {
log.Printf("Error writing to log cache: %s\n", err.Error())
dropped.Inc()
} else {
egressDuration.Observe(end.Sub(start).Seconds())
egress.Inc()
egressRate.Mark(1)
}
}
return conn
}
func writeWithRetry(conn net.Conn, ip, syslogPort, msg string, enableTLS bool) (net.Conn, error) {
_, err := conn.Write([]byte(msg))
if err != nil {
conn.Close()
conn = connect(ip, syslogPort, enableTLS)
if opErr, ok := err.(*net.OpError); ok {
if syscallErr, ok := opErr.Err.(*os.SyscallError); ok {
if syscallErr.Err == syscall.ECONNRESET {
reset.Inc()
_, err = conn.Write([]byte(msg))
}
}
}
}
return conn, err
}
func connect(ip, syslogPort string, enableTLS bool) net.Conn {
for {
var conn net.Conn
var err error
if enableTLS {
config := &tls.Config{InsecureSkipVerify: true}
conn, err = tls.Dial("tcp", ip+":"+syslogPort, config)
} else {
conn, err = net.Dial("tcp", ip+":"+syslogPort)
}
if err != nil {
log.Printf("failed connect to endpoint %s: %s", ip, err)
time.Sleep(100 * time.Millisecond)
} else {
return conn
}
}
}