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smart_merge.go
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smart_merge.go
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package config
import (
"fmt"
"net"
"net/url"
"reflect"
"regexp"
"github.com/golang/glog"
"github.com/GoogleCloudPlatform/kubernetes/pkg/client"
clientcmdapi "github.com/GoogleCloudPlatform/kubernetes/pkg/client/clientcmd/api"
"github.com/GoogleCloudPlatform/kubernetes/pkg/util"
"github.com/openshift/origin/pkg/cmd/flagtypes"
)
var invalidSafeStringSep = regexp.MustCompile(`[.:/]`)
// CreatePartialConfig takes a clientCfg and builds a config (kubeconfig style) from it.
func CreateConfig(credentialsName string, namespace string, clientCfg *client.Config) clientcmdapi.Config {
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
}
if len(credentialsName) == 0 {
credentialsName = "osc-login"
}
config.AuthInfos[credentialsName] = *credentials
serverAddr := flagtypes.Addr{Value: clientCfg.Host}.Default()
clusterName := fmt.Sprintf("%v:%v", serverAddr.Host, serverAddr.Port)
cluster := clientcmdapi.NewCluster()
cluster.Server = clientCfg.Host
cluster.CertificateAuthority = clientCfg.CAFile
if len(cluster.CertificateAuthority) == 0 {
cluster.CertificateAuthorityData = clientCfg.CAData
}
cluster.InsecureSkipTLSVerify = clientCfg.Insecure
config.Clusters[clusterName] = *cluster
contextName := clusterName + "-" + credentialsName
context := clientcmdapi.NewContext()
context.Cluster = clusterName
context.AuthInfo = credentialsName
context.Namespace = namespace
config.Contexts[contextName] = *context
config.CurrentContext = contextName
return *config
}
// MergeConfig takes a haystack to look for existing stanzas in (probably the merged config) and the new additions to merge in.
// It tries to find equivalents for the addition inside of the
// haystack and uses the mapping to avoid creating additional stanzas with duplicate information. It either locates or original
// stanzas or creates new ones for clusters and users. Then it uses the mapped names to build the correct contexts
func MergeConfig(haystack, addition clientcmdapi.Config) (*clientcmdapi.Config, error) {
ret := haystack
requestedClusterNamesToActualClusterNames := map[string]string{}
existingClusterNames, err := getMapKeys(reflect.ValueOf(haystack.Clusters))
if err != nil {
return nil, err
}
for requestedKey, needle := range addition.Clusters {
if existingName := FindExistingClusterName(haystack, needle); len(existingName) > 0 {
requestedClusterNamesToActualClusterNames[requestedKey] = existingName
continue
}
uniqueName := getUniqueName(requestedKey, existingClusterNames)
requestedClusterNamesToActualClusterNames[requestedKey] = uniqueName
ret.Clusters[uniqueName] = needle
}
requestedAuthInfoNamesToActualAuthInfoNames := map[string]string{}
existingAuthInfoNames, err := getMapKeys(reflect.ValueOf(haystack.AuthInfos))
if err != nil {
return nil, err
}
for requestedKey, needle := range addition.AuthInfos {
if existingName := FindExistingAuthInfoName(haystack, needle); len(existingName) > 0 {
requestedAuthInfoNamesToActualAuthInfoNames[requestedKey] = existingName
continue
}
uniqueName := getUniqueName(requestedKey, existingAuthInfoNames)
requestedAuthInfoNamesToActualAuthInfoNames[requestedKey] = uniqueName
ret.AuthInfos[uniqueName] = needle
}
requestedContextNamesToActualContextNames := map[string]string{}
existingContextNames, err := getMapKeys(reflect.ValueOf(haystack.Contexts))
if err != nil {
return nil, err
}
for requestedKey, needle := range addition.Contexts {
exists := false
actualContext := clientcmdapi.NewContext()
actualContext.AuthInfo, exists = requestedAuthInfoNamesToActualAuthInfoNames[needle.AuthInfo]
if !exists {
actualContext.AuthInfo = needle.AuthInfo
}
actualContext.Cluster, exists = requestedClusterNamesToActualClusterNames[needle.Cluster]
if !exists {
actualContext.Cluster = needle.Cluster
}
actualContext.Namespace = needle.Namespace
actualContext.Extensions = needle.Extensions
if existingName := FindExistingContextName(haystack, *actualContext); len(existingName) > 0 {
// if this already exists, just move to the next, our job is done
requestedContextNamesToActualContextNames[requestedKey] = existingName
continue
}
uniqueName := GenerateContextIdentifier(actualContext.Namespace, actualContext.Cluster, actualContext.AuthInfo, existingContextNames)
requestedContextNamesToActualContextNames[requestedKey] = uniqueName
ret.Contexts[uniqueName] = *actualContext
}
if len(addition.CurrentContext) > 0 {
if newCurrentContext, exists := requestedContextNamesToActualContextNames[addition.CurrentContext]; exists {
ret.CurrentContext = newCurrentContext
} else {
ret.CurrentContext = addition.CurrentContext
}
}
return &ret, nil
}
// FindExistingClusterName finds the nickname for the passed cluster config
func FindExistingClusterName(haystack clientcmdapi.Config, needle clientcmdapi.Cluster) string {
for key, cluster := range haystack.Clusters {
cluster.LocationOfOrigin = ""
if reflect.DeepEqual(cluster, needle) {
return key
}
}
return ""
}
// FindExistingAuthInfoName finds the nickname for the passed auth info
func FindExistingAuthInfoName(haystack clientcmdapi.Config, needle clientcmdapi.AuthInfo) string {
for key, authInfo := range haystack.AuthInfos {
authInfo.LocationOfOrigin = ""
if reflect.DeepEqual(authInfo, needle) {
return key
}
}
return ""
}
// 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 ""
}
func getMapKeys(theMap reflect.Value) (*util.StringSet, error) {
if theMap.Kind() != reflect.Map {
return nil, fmt.Errorf("theMap must be of type %v, not %v", reflect.Map, theMap.Kind())
}
ret := &util.StringSet{}
switch theMap.Kind() {
case reflect.Map:
for _, keyValue := range theMap.MapKeys() {
ret.Insert(keyValue.String())
}
}
return ret, nil
}
func getUniqueName(basename string, existingNames *util.StringSet) string {
if parsedUrl, err := url.Parse(basename); err != nil {
if host, port, err := net.SplitHostPort(parsedUrl.Host); err != nil {
if !existingNames.Has(host) {
return host
}
if id := host + "-" + port; !existingNames.Has(id) {
return id
}
}
}
basename = invalidSafeStringSep.ReplaceAllString(basename, "-")
if !existingNames.Has(basename) {
return basename
}
for i := 0; i < 100; i++ {
trialName := fmt.Sprintf("%v-%d", basename, i)
if !existingNames.Has(trialName) {
return trialName
}
}
return string(util.NewUUID())
}
// GenerateContextIdentifier generates the best context identifier possible based on the information it gets.
func GenerateContextIdentifier(namespace string, cluster string, authInfo string, existingContextIdentifiers *util.StringSet) string {
ctx := ""
// try to use plain namespace
if len(namespace) > 0 {
ctx += namespace
if !existingContextIdentifiers.Has(ctx) {
return ctx
}
}
// tries appending "-host" or "-host-port"
if len(cluster) > 0 {
if parsedUrl, err := url.Parse(cluster); err != nil {
if host, port, err := net.SplitHostPort(parsedUrl.Host); err != nil {
if len(ctx) > 0 {
ctx += "-"
}
ctx += host
if !existingContextIdentifiers.Has(ctx) {
return ctx
}
ctx += "-" + port
if !existingContextIdentifiers.Has(ctx) {
return ctx
}
} else {
if len(ctx) > 0 {
ctx += "-"
}
ctx += "-" + parsedUrl.Host
if !existingContextIdentifiers.Has(ctx) {
return ctx
}
}
}
}
// tries appending "-username"
if len(authInfo) > 0 {
if len(ctx) > 0 {
ctx += "-"
}
ctx += authInfo
if !existingContextIdentifiers.Has(ctx) {
return ctx
}
}
// append an integer
for i := 0; i < 100; i++ {
if trialName := fmt.Sprintf("%v-%d", ctx, i); !existingContextIdentifiers.Has(trialName) {
return trialName
}
}
glog.Fatalf("Unable to generate a context identifier. Please provide a context using the '--context=<context>' flag.")
return ""
}