Separate command from the main package

cmd/healthcheck/healthcheck.go

@@ -0,0 +1,73 @@
+package healthcheck
+
+import (
+	"crypto/tls"
+	"errors"
+	"fmt"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/containous/flaeg"
+	"github.com/containous/traefik/cmd"
+	"github.com/containous/traefik/configuration"
+)
+
+// NewCmd builds a new HealthCheck command
+func NewCmd(traefikConfiguration *cmd.TraefikConfiguration, traefikPointersConfiguration *cmd.TraefikConfiguration) *flaeg.Command {
+	return &flaeg.Command{
+		Name:                  "healthcheck",
+		Description:           `Calls traefik /ping to check health (web provider must be enabled)`,
+		Config:                traefikConfiguration,
+		DefaultPointersConfig: traefikPointersConfiguration,
+		Run: runCmd(traefikConfiguration),
+		Metadata: map[string]string{
+			"parseAllSources": "true",
+		},
+	}
+}
+
+func runCmd(traefikConfiguration *cmd.TraefikConfiguration) func() error {
+	return func() error {
+		traefikConfiguration.GlobalConfiguration.SetEffectiveConfiguration(traefikConfiguration.ConfigFile)
+
+		resp, errPing := Do(traefikConfiguration.GlobalConfiguration)
+		if errPing != nil {
+			fmt.Printf("Error calling healthcheck: %s\n", errPing)
+			os.Exit(1)
+		}
+		if resp.StatusCode != http.StatusOK {
+			fmt.Printf("Bad healthcheck status: %s\n", resp.Status)
+			os.Exit(1)
+		}
+		fmt.Printf("OK: %s\n", resp.Request.URL)
+		os.Exit(0)
+		return nil
+	}
+}
+
+// Do try to do a healthcheck
+func Do(globalConfiguration configuration.GlobalConfiguration) (*http.Response, error) {
+	if globalConfiguration.Ping == nil {
+		return nil, errors.New("please enable `ping` to use health check")
+	}
+	pingEntryPoint, ok := globalConfiguration.EntryPoints[globalConfiguration.Ping.EntryPoint]
+	if !ok {
+		return nil, errors.New("missing `ping` entrypoint")
+	}
+
+	client := &http.Client{Timeout: 5 * time.Second}
+	protocol := "http"
+	if pingEntryPoint.TLS != nil {
+		protocol = "https"
+		tr := &http.Transport{
+			TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
+		}
+		client.Transport = tr
+	}
+	path := "/"
+	if globalConfiguration.Web != nil {
+		path = globalConfiguration.Web.Path
+	}
+	return client.Head(protocol + "://" + pingEntryPoint.Address + path + "ping")
+}