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template_functions.go
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template_functions.go
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package nodeup
import (
"encoding/base64"
"fmt"
"github.com/golang/glog"
"k8s.io/kops/upup/pkg/api"
"k8s.io/kops/upup/pkg/fi"
"k8s.io/kops/upup/pkg/fi/secrets"
"k8s.io/kops/util/pkg/vfs"
"text/template"
)
const TagMaster = "_kubernetes_master"
const DefaultProtokubeImage = "kope/protokube:1.4"
// templateFunctions is a simple helper-class for the functions accessible to templates
type templateFunctions struct {
nodeupConfig *NodeUpConfig
// cluster is populated with the current cluster
cluster *api.Cluster
// instanceGroup is populated with this node's instance group
instanceGroup *api.InstanceGroup
// keyStore is populated with a KeyStore, if KeyStore is set
keyStore fi.CAStore
// secretStore is populated with a SecretStore, if SecretStore is set
secretStore fi.SecretStore
tags map[string]struct{}
// kubeletConfig is the kubelet config for the current node
kubeletConfig *api.KubeletConfigSpec
}
// newTemplateFunctions is the constructor for templateFunctions
func newTemplateFunctions(nodeupConfig *NodeUpConfig, cluster *api.Cluster, instanceGroup *api.InstanceGroup, tags map[string]struct{}) (*templateFunctions, error) {
t := &templateFunctions{
nodeupConfig: nodeupConfig,
cluster: cluster,
instanceGroup: instanceGroup,
tags: tags,
}
if cluster.Spec.SecretStore != "" {
glog.Infof("Building SecretStore at %q", cluster.Spec.SecretStore)
p, err := vfs.Context.BuildVfsPath(cluster.Spec.SecretStore)
if err != nil {
return nil, fmt.Errorf("error building secret store path: %v", err)
}
t.secretStore = secrets.NewVFSSecretStore(p)
} else {
return nil, fmt.Errorf("SecretStore not set")
}
if cluster.Spec.KeyStore != "" {
glog.Infof("Building KeyStore at %q", cluster.Spec.KeyStore)
p, err := vfs.Context.BuildVfsPath(cluster.Spec.KeyStore)
if err != nil {
return nil, fmt.Errorf("error building key store path: %v", err)
}
t.keyStore = fi.NewVFSCAStore(p)
} else {
return nil, fmt.Errorf("KeyStore not set")
}
{
instanceGroup := t.instanceGroup
if instanceGroup == nil {
// Old clusters might not have exported instance groups
// in that case we build a synthetic instance group with the information that BuildKubeletConfigSpec needs
// TODO: Remove this once we have a stable release
glog.Warningf("Building a synthetic instance group")
instanceGroup = &api.InstanceGroup{}
instanceGroup.Name = "synthetic"
if t.IsMaster() {
instanceGroup.Spec.Role = api.InstanceGroupRoleMaster
} else {
instanceGroup.Spec.Role = api.InstanceGroupRoleNode
}
t.instanceGroup = instanceGroup
}
kubeletConfigSpec, err := api.BuildKubeletConfigSpec(cluster, instanceGroup)
if err != nil {
return nil, fmt.Errorf("error building kubelet config: %v", err)
}
t.kubeletConfig = kubeletConfigSpec
}
return t, nil
}
func (t *templateFunctions) populate(dest template.FuncMap) {
dest["CACertificatePool"] = t.CACertificatePool
dest["CACertificate"] = t.CACertificate
dest["PrivateKey"] = t.PrivateKey
dest["Certificate"] = t.Certificate
dest["AllTokens"] = t.AllTokens
dest["GetToken"] = t.GetToken
dest["BuildFlags"] = buildFlags
dest["Base64Encode"] = func(s string) string {
return base64.StdEncoding.EncodeToString([]byte(s))
}
dest["HasTag"] = t.HasTag
dest["IsMaster"] = t.IsMaster
// TODO: We may want to move these to a nodeset / masterset specific thing
dest["KubeDNS"] = func() *api.KubeDNSConfig {
return t.cluster.Spec.KubeDNS
}
dest["KubeScheduler"] = func() *api.KubeSchedulerConfig {
return t.cluster.Spec.KubeScheduler
}
dest["KubeAPIServer"] = func() *api.KubeAPIServerConfig {
return t.cluster.Spec.KubeAPIServer
}
dest["KubeControllerManager"] = func() *api.KubeControllerManagerConfig {
return t.cluster.Spec.KubeControllerManager
}
dest["KubeProxy"] = t.KubeProxyConfig
dest["KubeletConfig"] = func() *api.KubeletConfigSpec {
return t.kubeletConfig
}
dest["ClusterName"] = func() string {
return t.cluster.Name
}
dest["ProtokubeImage"] = t.ProtokubeImage
dest["ProtokubeFlags"] = t.ProtokubeFlags
}
// IsMaster returns true if we are tagged as a master
func (t *templateFunctions) IsMaster() bool {
return t.HasTag(TagMaster)
}
// Tag returns true if we are tagged with the specified tag
func (t *templateFunctions) HasTag(tag string) bool {
_, found := t.tags[tag]
return found
}
// CACertificatePool returns the set of valid CA certificates for the cluster
func (t *templateFunctions) CACertificatePool() (*fi.CertificatePool, error) {
if t.keyStore != nil {
return t.keyStore.CertificatePool(fi.CertificateId_CA)
}
// Fallback to direct properties
glog.Infof("Falling back to direct configuration for keystore")
cert, err := t.CACertificate()
if err != nil {
return nil, err
}
if cert == nil {
return nil, fmt.Errorf("CA certificate not found (with fallback)")
}
pool := &fi.CertificatePool{}
pool.Primary = cert
return pool, nil
}
// CACertificate returns the primary CA certificate for the cluster
func (t *templateFunctions) CACertificate() (*fi.Certificate, error) {
return t.keyStore.Cert(fi.CertificateId_CA)
}
// PrivateKey returns the specified private key
func (t *templateFunctions) PrivateKey(id string) (*fi.PrivateKey, error) {
return t.keyStore.PrivateKey(id)
}
// Certificate returns the specified private key
func (t *templateFunctions) Certificate(id string) (*fi.Certificate, error) {
return t.keyStore.Cert(id)
}
// AllTokens returns a map of all tokens
func (t *templateFunctions) AllTokens() (map[string]string, error) {
tokens := make(map[string]string)
ids, err := t.secretStore.ListSecrets()
if err != nil {
return nil, err
}
for _, id := range ids {
token, err := t.secretStore.FindSecret(id)
if err != nil {
return nil, err
}
tokens[id] = string(token.Data)
}
return tokens, nil
}
// GetToken returns the specified token
func (t *templateFunctions) GetToken(key string) (string, error) {
token, err := t.secretStore.FindSecret(key)
if err != nil {
return "", err
}
if token == nil {
return "", fmt.Errorf("token not found: %q", key)
}
return string(token.Data), nil
}
// ProtokubeImage returns the docker image for protokube
func (t *templateFunctions) ProtokubeImage() string {
image := ""
if t.nodeupConfig.ProtokubeImage != nil {
image = t.nodeupConfig.ProtokubeImage.Source
}
if image == "" {
// use current default corresponding to this version of nodeup
image = DefaultProtokubeImage
}
return image
}
// ProtokubeFlags returns the flags object for protokube
func (t *templateFunctions) ProtokubeFlags() *ProtokubeFlags {
f := &ProtokubeFlags{}
master := t.IsMaster()
f.Master = fi.Bool(master)
if master {
f.Channels = t.nodeupConfig.Channels
}
f.LogLevel = fi.Int(8)
f.Containerized = fi.Bool(true)
if t.cluster.Spec.DNSZone != "" {
f.DNSZoneName = fi.String(t.cluster.Spec.DNSZone)
}
return f
}
// KubeProxyConfig builds the KubeProxyConfig configuration object
func (t *templateFunctions) KubeProxyConfig() *api.KubeProxyConfig {
config := &api.KubeProxyConfig{}
*config = *t.cluster.Spec.KubeProxy
// As a special case, if this is the master, we point kube-proxy to the local IP
// This prevents a circular dependency where kube-proxy can't come up until DNS comes up,
// which would mean that DNS can't rely on API to come up
if t.IsMaster() {
glog.Infof("kube-proxy running on the master; setting API endpoint to localhost")
config.Master = "http://127.0.0.1:8080"
}
return config
}