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smart_merge.go
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smart_merge.go
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package config
import (
"net/url"
"reflect"
"strings"
"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
clientcmdapi "github.com/GoogleCloudPlatform/kubernetes/pkg/client/clientcmd/api"
"github.com/GoogleCloudPlatform/kubernetes/third_party/golang/netutil"
osclient "github.com/openshift/origin/pkg/client"
)
// getClusterNickname returns host:port of the clientConfig.Host, with .'s replaced by -'s
func getClusterNickname(clientCfg *client.Config) (string, error) {
u, err := url.Parse(clientCfg.Host)
if err != nil {
return "", err
}
hostPort := netutil.CanonicalAddr(u)
// we need a character other than "." to avoid conflicts with. replace with '-'
return strings.Replace(hostPort, ".", "-", -1), nil
}
// getUserNickname returns "username(as known by the server)/getClusterNickname". This allows tab completion for switching users to
// work easily and obviously.
func getUserNickname(clientCfg *client.Config) (string, error) {
client, err := osclient.New(clientCfg)
if err != nil {
return "", err
}
userInfo, err := client.Users().Get("~")
if err != nil {
return "", err
}
clusterNick, err := getClusterNickname(clientCfg)
if err != nil {
return "", err
}
return userInfo.Name + "/" + clusterNick, nil
}
// getContextNickname returns "namespace/getClusterNickname/username(as known by the server)". This allows tab completion for switching projects/context
// to work easily. First tab is the most selective on project. Second stanza in the next most selective on cluster name. The chances of a user trying having
// one projects on a single server that they want to operate against with two identities is low, so username is last.
func getContextNickname(namespace string, clientCfg *client.Config) (string, error) {
client, err := osclient.New(clientCfg)
if err != nil {
return "", err
}
userInfo, err := client.Users().Get("~")
if err != nil {
return "", err
}
clusterNick, err := getClusterNickname(clientCfg)
if err != nil {
return "", err
}
return namespace + "/" + clusterNick + "/" + userInfo.Name, nil
}
// CreatePartialConfig takes a clientCfg and builds a config (kubeconfig style) from it.
func CreateConfig(namespace string, clientCfg *client.Config) (*clientcmdapi.Config, error) {
clusterNick, err := getClusterNickname(clientCfg)
if err != nil {
return nil, err
}
userNick, err := getUserNickname(clientCfg)
if err != nil {
return nil, err
}
contextNick, err := getContextNickname(namespace, clientCfg)
if err != nil {
return nil, err
}
config := clientcmdapi.NewConfig()
credentials := clientcmdapi.NewAuthInfo()
credentials.Token = clientCfg.BearerToken
credentials.ClientCertificate = clientCfg.TLSClientConfig.CertFile
if len(credentials.ClientCertificate) == 0 {
credentials.ClientCertificateData = clientCfg.TLSClientConfig.CertData
}
credentials.ClientKey = clientCfg.TLSClientConfig.KeyFile
if len(credentials.ClientKey) == 0 {
credentials.ClientKeyData = clientCfg.TLSClientConfig.KeyData
}
config.AuthInfos[userNick] = *credentials
cluster := clientcmdapi.NewCluster()
cluster.Server = clientCfg.Host
cluster.CertificateAuthority = clientCfg.CAFile
if len(cluster.CertificateAuthority) == 0 {
cluster.CertificateAuthorityData = clientCfg.CAData
}
cluster.InsecureSkipTLSVerify = clientCfg.Insecure
cluster.APIVersion = clientCfg.Version
config.Clusters[clusterNick] = *cluster
context := clientcmdapi.NewContext()
context.Cluster = clusterNick
context.AuthInfo = userNick
context.Namespace = namespace
config.Contexts[contextNick] = *context
config.CurrentContext = contextNick
return config, nil
}
// MergeConfig adds the additional Config stanzas to the startingConfig. It blindly stomps clusters and users, but
// it searches for a matching context before writing a new one.
func MergeConfig(startingConfig, addition clientcmdapi.Config) (*clientcmdapi.Config, error) {
ret := startingConfig
for requestedKey, value := range addition.Clusters {
ret.Clusters[requestedKey] = value
}
for requestedKey, value := range addition.AuthInfos {
ret.AuthInfos[requestedKey] = value
}
requestedContextNamesToActualContextNames := map[string]string{}
for requestedKey, newContext := range addition.Contexts {
actualContext := clientcmdapi.NewContext()
actualContext.AuthInfo = newContext.AuthInfo
actualContext.Cluster = newContext.Cluster
actualContext.Namespace = newContext.Namespace
actualContext.Extensions = newContext.Extensions
if existingName := FindExistingContextName(startingConfig, *actualContext); len(existingName) > 0 {
// if this already exists, just move to the next, our job is done
requestedContextNamesToActualContextNames[requestedKey] = existingName
continue
}
requestedContextNamesToActualContextNames[requestedKey] = requestedKey
ret.Contexts[requestedKey] = *actualContext
}
if len(addition.CurrentContext) > 0 {
if newCurrentContext, exists := requestedContextNamesToActualContextNames[addition.CurrentContext]; exists {
ret.CurrentContext = newCurrentContext
} else {
ret.CurrentContext = addition.CurrentContext
}
}
return &ret, nil
}
// FindExistingContextName finds the nickname for the passed context
func FindExistingContextName(haystack clientcmdapi.Config, needle clientcmdapi.Context) string {
for key, context := range haystack.Contexts {
context.LocationOfOrigin = ""
if reflect.DeepEqual(context, needle) {
return key
}
}
return ""
}