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metrics.go
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/
metrics.go
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package utils
import (
"fmt"
"net/http"
"os"
"strconv"
)
const DefaultMetricPort = "3006"
const DefaultMetricPath = "/metrics"
func StartMetrics() {
port := os.Getenv("METRICS_PORT")
if len(port) == 0 {
port = DefaultMetricPort
} else {
p, err := strconv.ParseInt(port, 10, 32)
if err != nil {
panic(err)
}
if p > 65535 || p < 0 {
panic("METRICS_PORT must between 0 and 65535 ")
}
}
err := http.ListenAndServe(fmt.Sprintf(":%s", port), MetricsHandler{})
if err != nil {
Errorf("metrics service error: %v", err)
}
}
type MetricsHandler struct {
}
func (MetricsHandler) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
if req.URL.Path != DefaultMetricPath {
resp.WriteHeader(http.StatusNotFound)
responseBody(resp, "Not Found")
return
}
responseBody(resp, "Hello")
}
func responseBody(resp http.ResponseWriter, data string) {
_, err := resp.Write([]byte(data))
if err != nil {
Errorf("metrics error: %v", err)
}
}