Health check (easegress-io#1143)

* add health check code and integration test

* add more integration test

* add more test for health check

* github actions

* add health check for websocket

* add more test for websocket health check

* update go.mod

* update doc

* update based on views

build/test/client.go

@@ -48,7 +48,7 @@ func createResource(yamlFile string) error {
  cmd := egctlCmd("create", "-f", "-")
  cmd.Stdin = strings.NewReader(yamlFile)
  _, stderr, err := runCmd(cmd)
- if err != nil {
+ if err != nil || stderr != "" {
  return fmt.Errorf("create resource failed\nstderr: %v\nerr: %v", stderr, err)
  }
  return nil
@@ -58,7 +58,7 @@ func applyResource(yamlFile string) error {
  cmd := egctlCmd("apply", "-f", "-")
  cmd.Stdin = strings.NewReader(yamlFile)
  _, stderr, err := runCmd(cmd)
- if err != nil {
+ if err != nil || stderr != "" {
  return fmt.Errorf("apply resource failed\nstderr: %v\nerr: %v", stderr, err)
  }
  return nil
@@ -70,7 +70,7 @@ func deleteResource(kind string, args ...string) error {
  cmd.Args = append(cmd.Args, args...)
  }
  _, stderr, err := runCmd(cmd)
- if err != nil {
+ if err != nil || stderr != "" {
  return fmt.Errorf("delete resource failed\nstderr: %v\nerr: %v", stderr, err)
  }
  return nil
@@ -82,7 +82,7 @@ func describeResource(kind string, args ...string) (string, error) {
  cmd.Args = append(cmd.Args, args...)
  }
  stdout, stderr, err := runCmd(cmd)
- if err != nil {
+ if err != nil || stderr != "" {
  return "", fmt.Errorf("describe resource failed\nstderr: %v\nerr: %v", stderr, err)
  }
  return stdout, nil
@@ -94,7 +94,7 @@ func getResource(kind string, args ...string) (string, error) {
  cmd.Args = append(cmd.Args, args...)
  }
  stdout, stderr, err := runCmd(cmd)
- if err != nil {
+ if err != nil || stderr != "" {
  return "", fmt.Errorf("describe resource failed\nstderr: %v\nerr: %v", stderr, err)
  }
  return stdout, nil