traefik/cmd/healthcheck/healthcheck.go

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package healthcheck
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import (
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"errors"
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"fmt"
"net/http"
"os"
"time"
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"github.com/containous/traefik/v2/pkg/cli"
"github.com/containous/traefik/v2/pkg/config/static"
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)
// NewCmd builds a new HealthCheck command.
func NewCmd(traefikConfiguration *static.Configuration, loaders []cli.ResourceLoader) *cli.Command {
return &cli.Command{
Name: "healthcheck",
Description: `Calls Traefik /ping endpoint (disabled by default) to check the health of Traefik.`,
Configuration: traefikConfiguration,
Run: runCmd(traefikConfiguration),
Resources: loaders,
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}
}
func runCmd(traefikConfiguration *static.Configuration) func(_ []string) error {
return func(_ []string) error {
traefikConfiguration.SetEffectiveConfiguration()
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resp, errPing := Do(*traefikConfiguration)
if resp != nil {
resp.Body.Close()
}
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if errPing != nil {
fmt.Printf("Error calling healthcheck: %s\n", errPing)
os.Exit(1)
}
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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
}
}
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// Do try to do a healthcheck
func Do(staticConfiguration static.Configuration) (*http.Response, error) {
if staticConfiguration.Ping == nil {
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return nil, errors.New("please enable `ping` to use health check")
}
ep := staticConfiguration.Ping.EntryPoint
if ep == "" {
ep = "traefik"
}
pingEntryPoint, ok := staticConfiguration.EntryPoints[ep]
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if !ok {
return nil, fmt.Errorf("ping: missing %s entry point", ep)
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}
client := &http.Client{Timeout: 5 * time.Second}
protocol := "http"
// FIXME Handle TLS on ping etc...
// if pingEntryPoint.TLS != nil {
// protocol = "https"
// tr := &http.Transport{
// TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
// }
// client.Transport = tr
// }
path := "/"
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return client.Head(protocol + "://" + pingEntryPoint.Address + path + "ping")
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}