Health server runs on 127.0.0.1:9999, fix #272

internal/healthcheck/client.go

@@ -0,0 +1,42 @@
+package healthcheck
+
+import (
+	"context"
+	"fmt"
+	"io/ioutil"
+	"net/http"
+)
+
+type Checker interface {
+	Check(ctx context.Context, url string) error
+}
+
+type checker struct {
+	httpClient *http.Client
+}
+
+func NewChecker(httpClient *http.Client) Checker {
+	return &checker{
+		httpClient: httpClient,
+	}
+}
+
+func (h *checker) Check(ctx context.Context, url string) error {
+	request, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return err
+	}
+	response, err := h.httpClient.Do(request)
+	if err != nil {
+		return err
+	}
+	defer response.Body.Close()
+	if response.StatusCode == http.StatusOK {
+		return nil
+	}
+	b, err := ioutil.ReadAll(response.Body)
+	if err != nil {
+		return err
+	}
+	return fmt.Errorf("%s: %s", response.Status, string(b))
+}