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provider.go
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/
provider.go
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package metrics
import (
"bufio"
"context"
"net/http"
"strconv"
"strings"
"sync"
"time"
"github.com/sirupsen/logrus"
)
type MetricsProvider interface {
Collect(context.Context, *logrus.Entry) (map[string]float64, error)
}
type ManualMetricsProvider struct {
metrics map[string]float64
collectionDelay time.Duration
mu sync.Mutex
}
func (srv *ManualMetricsProvider) WithMetrics(metrics map[string]float64) *ManualMetricsProvider {
srv.mu.Lock()
defer srv.mu.Unlock()
srv.metrics = metrics
return srv
}
func (srv *ManualMetricsProvider) WithCollectionDelay(d time.Duration) *ManualMetricsProvider {
srv.mu.Lock()
defer srv.mu.Unlock()
srv.collectionDelay = d
return srv
}
func (srv *ManualMetricsProvider) Collect(_ context.Context, _ *logrus.Entry) (map[string]float64, error) {
srv.mu.Lock()
defer srv.mu.Unlock()
if srv.collectionDelay != 0 {
time.Sleep(srv.collectionDelay)
}
return srv.metrics, nil
}
// HttpMetricsProvider is a metrics provider scraping metrics from a url.
type HttpMetricsProvider struct {
url string
client *http.Client
}
func NewHttpMetricsProvider(url string, client *http.Client) *HttpMetricsProvider {
if client == nil {
client = http.DefaultClient
}
return &HttpMetricsProvider{
url: url,
client: client,
}
}
func (srv *HttpMetricsProvider) Collect(ctx context.Context, _ *logrus.Entry) (map[string]float64, error) {
req, err := http.NewRequestWithContext(ctx, "GET", srv.url, nil)
if err != nil {
return nil, err
}
resp, err := srv.client.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
metrics := make(map[string]float64)
scanner := bufio.NewScanner(resp.Body)
for scanner.Scan() {
line := scanner.Text()
if i := strings.Index(line, "#"); i >= 0 && i < len(line) {
line = line[:i]
}
if len(line) == 0 {
continue
}
keyVal := strings.Split(line, " ")
if len(keyVal) != 2 {
continue
}
key := keyVal[0]
val, err := strconv.ParseFloat(keyVal[1], 64)
if err != nil {
continue
}
metrics[key] = val
}
return metrics, nil
}