func buildEnvoySidecar()

in pkg/inject/sidecar_builder.go [192:238]
42 lines of code
3 McCabe index (conditional complexity)

func buildEnvoySidecar(vars EnvoyTemplateVariables, env map[string]string) (corev1.Container, error) {

	envoy := corev1.Container{
		Name:  "envoy",
		Image: fmt.Sprintf("%s:%s", vars.SidecarImageRepository, vars.SidecarImageTag),
		SecurityContext: &corev1.SecurityContext{
			RunAsUser: aws.Int64(1337),
		},
		Ports: []corev1.ContainerPort{
			{
				Name:          "stats",
				ContainerPort: vars.AdminAccessPort,
				Protocol:      "TCP",
			},
		},
		Lifecycle: &corev1.Lifecycle{
			PostStart: nil,
			PreStop: &corev1.LifecycleHandler{
				Exec: &corev1.ExecAction{Command: []string{
					"sh", "-c", fmt.Sprintf("sleep %s", vars.PreStopDelay),
				}},
			},
		},
	}

	if vars.WaitUntilProxyReady {
		envoy.Lifecycle.PostStart = &corev1.LifecycleHandler{
			Exec: &corev1.ExecAction{Command: []string{
				// use bash regex and rematch to parse and check envoy version is >= 1.22.2.1
				"sh", "-c", fmt.Sprintf("if [[ $(/usr/bin/envoy --version) =~ ([0-9]+)\\.([0-9]+)\\.([0-9]+)-appmesh\\.([0-9]+) && "+
					"${BASH_REMATCH[1]} -ge 2 || (${BASH_REMATCH[1]} -ge 1 && ${BASH_REMATCH[2]} -gt 22) || (${BASH_REMATCH[1]} -ge 1 && "+
					"${BASH_REMATCH[2]} -ge 22 && ${BASH_REMATCH[3]} -gt 2) || (${BASH_REMATCH[1]} -ge 1 && ${BASH_REMATCH[2]} -ge 22 && "+
					"${BASH_REMATCH[3]} -ge 2 && ${BASH_REMATCH[4]} -gt 0) ]]; then APPNET_AGENT_POLL_ENVOY_READINESS_TIMEOUT_S=%d "+
					"APPNET_AGENT_POLL_ENVOY_READINESS_INTERVAL_S=%d /usr/bin/agent -envoyReadiness; else echo 'WaitUntilProxyReady "+
					"is not supported in Envoy version < 1.22.2.1'; fi", vars.PostStartTimeout, vars.PostStartInterval),
			}},
		}
	}

	vname := fmt.Sprintf("mesh/%s/virtualNode/%s", vars.MeshName, vars.VirtualGatewayOrNodeName)
	if err := updateEnvMapForEnvoy(vars, env, vname); err != nil {
		return envoy, err
	}
	envoy.Env = getEnvoyEnv(env)
	return envoy, nil

}