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main.go
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main.go
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package main
import (
"encoding/json"
"fmt"
"log"
"net/http"
"github.com/official-stallion/race/internal/client"
"github.com/official-stallion/race/internal/config"
"github.com/official-stallion/race/internal/metrics"
)
func handler(metrics *metrics.Handler) func(http.ResponseWriter, *http.Request) {
return func(writer http.ResponseWriter, _ *http.Request) {
js, err := json.Marshal(metrics.Metrics)
if err != nil {
http.Error(writer, err.Error(), http.StatusInternalServerError)
return
}
writer.Header().Set("Content-Type", "application/json")
_, _ = writer.Write(js)
}
}
func main() {
// load configs
cfg := config.Load()
// create new client
cli := client.Client{
Metrics: metrics.New(cfg.Providers, cfg.Consumers, cfg.Topics),
Debug: cfg.Debug,
}
// create consumers
j := 0
for i := 0; i < cfg.Consumers; i++ {
topic := cfg.Topics[j]
go cli.Consumer(cfg.Host, topic)
j++
if j == len(cfg.Topics) {
j = 0
}
}
// create providers
j = 0
for i := 0; i < cfg.Providers; i++ {
topic := cfg.Topics[j]
go cli.Provider(cfg.Host, topic, cfg.Message, cfg.Offset)
j++
if j == len(cfg.Topics) {
j = 0
}
}
mux := http.NewServeMux()
mux.HandleFunc("/metrics", handler(cli.Metrics))
log.Println(fmt.Sprintf("metrics server started on %d ...", 8080))
if err := http.ListenAndServe(fmt.Sprintf(":%d", 8080), mux); err != nil {
log.Println(fmt.Errorf("failed to start metrics server error=%w", err))
}
}