Move cli back into cmd/ after filter branch

cmd/virtual-kubelet/commands/root/opts.go

@@ -0,0 +1,146 @@
+// Copyright © 2017 The virtual-kubelet authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package root
+
+import (
+	"os"
+	"path/filepath"
+	"strconv"
+	"time"
+
+	"github.com/mitchellh/go-homedir"
+	"github.com/pkg/errors"
+	corev1 "k8s.io/api/core/v1"
+)
+
+// Defaults for root command options
+const (
+	DefaultNodeName             = "virtual-kubelet"
+	DefaultOperatingSystem      = "Linux"
+	DefaultInformerResyncPeriod = 1 * time.Minute
+	DefaultMetricsAddr          = ":10255"
+	DefaultListenPort           = 10250 // TODO(cpuguy83)(VK1.0): Change this to an addr instead of just a port.. we should not be listening on all interfaces.
+	DefaultPodSyncWorkers       = 10
+	DefaultKubeNamespace        = corev1.NamespaceAll
+
+	DefaultTaintEffect = string(corev1.TaintEffectNoSchedule)
+	DefaultTaintKey    = "virtual-kubelet.io/provider"
+)
+
+// Opts stores all the options for configuring the root virtual-kubelet command.
+// It is used for setting flag values.
+//
+// You can set the default options by creating a new `Opts` struct and passing
+// it into `SetDefaultOpts`
+type Opts struct {
+	// Path to the kubeconfig to use to connect to the Kubernetes API server.
+	KubeConfigPath string
+	// Namespace to watch for pods and other resources
+	KubeNamespace string
+	// Sets the port to listen for requests from the Kubernetes API server
+	ListenPort int32
+
+	// Node name to use when creating a node in Kubernetes
+	NodeName string
+
+	// Operating system to run pods for
+	OperatingSystem string
+
+	Provider           string
+	ProviderConfigPath string
+
+	TaintKey     string
+	TaintEffect  string
+	DisableTaint bool
+
+	MetricsAddr string
+
+	// Number of workers to use to handle pod notifications
+	PodSyncWorkers       int
+	InformerResyncPeriod time.Duration
+
+	// Use node leases when supported by Kubernetes (instead of node status updates)
+	EnableNodeLease bool
+
+	TraceExporters  []string
+	TraceSampleRate string
+	TraceConfig     TracingExporterOptions
+
+	// Startup Timeout is how long to wait for the kubelet to start
+	StartupTimeout time.Duration
+}
+
+// SetDefaultOpts sets default options for unset values on the passed in option struct.
+// Fields tht are already set will not be modified.
+func SetDefaultOpts(c *Opts) error {
+	if c.OperatingSystem == "" {
+		c.OperatingSystem = DefaultOperatingSystem
+	}
+
+	if c.NodeName == "" {
+		c.NodeName = getEnv("DEFAULT_NODE_NAME", DefaultNodeName)
+	}
+
+	if c.InformerResyncPeriod == 0 {
+		c.InformerResyncPeriod = DefaultInformerResyncPeriod
+	}
+
+	if c.MetricsAddr == "" {
+		c.MetricsAddr = DefaultMetricsAddr
+	}
+
+	if c.PodSyncWorkers == 0 {
+		c.PodSyncWorkers = DefaultPodSyncWorkers
+	}
+
+	if c.TraceConfig.ServiceName == "" {
+		c.TraceConfig.ServiceName = DefaultNodeName
+	}
+
+	if c.ListenPort == 0 {
+		if kp := os.Getenv("KUBELET_PORT"); kp != "" {
+			p, err := strconv.Atoi(kp)
+			if err != nil {
+				return errors.Wrap(err, "error parsing KUBELET_PORT environment variable")
+			}
+			c.ListenPort = int32(p)
+		} else {
+			c.ListenPort = DefaultListenPort
+		}
+	}
+
+	if c.KubeNamespace == "" {
+		c.KubeNamespace = DefaultKubeNamespace
+	}
+
+	if c.TaintKey == "" {
+		c.TaintKey = DefaultTaintKey
+	}
+	if c.TaintEffect == "" {
+		c.TaintEffect = DefaultTaintEffect
+	}
+
+	if c.KubeConfigPath == "" {
+		c.KubeConfigPath = os.Getenv("KUBECONFIG")
+		if c.KubeConfigPath == "" {
+			home, _ := homedir.Dir()
+			if home != "" {
+				c.KubeConfigPath = filepath.Join(home, ".kube", "config")
+			}
+		}
+	}
+
+	return nil
+}