/
kubeconfig.go
87 lines (74 loc) · 2.18 KB
/
kubeconfig.go
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package k8s
import (
"fmt"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/tools/clientcmd/api"
)
type Kubeconfig struct {
RestConfig *rest.Config
ClusterName string
Region string
Profile string
}
func (k Kubeconfig) String() string {
return fmt.Sprintf("cluster name: %s region %s", k.ClusterName, k.Region)
}
func NewKubeconfig(kubeconfigPath string) (Kubeconfig, error) {
clientConfig := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(
&clientcmd.ClientConfigLoadingRules{ExplicitPath: kubeconfigPath},
nil)
apiConfig, err := clientConfig.RawConfig()
if err != nil {
return Kubeconfig{}, fmt.Errorf("raw config: %v", err)
}
restConfig, err := clientConfig.ClientConfig()
if err != nil {
return Kubeconfig{}, fmt.Errorf("client configs: %v", err)
}
user := apiConfig.Contexts[apiConfig.CurrentContext].AuthInfo
exec := apiConfig.AuthInfos[user].Exec
if exec.Command != "aws" {
if exec.Command == "" {
return Kubeconfig{}, fmt.Errorf("exec command is not set in current %s contex, cannot determine cluster name and region", apiConfig.CurrentContext)
}
return Kubeconfig{}, fmt.Errorf("unexpected exec command %s for current %s contex, expected 'aws'", exec.Command, apiConfig.CurrentContext)
}
env := execEnvToMap(exec.Env)
return Kubeconfig{
RestConfig: restConfig,
ClusterName: getClusterName(exec.Args),
Region: getRegion(exec.Args, env),
Profile: getProfile(exec.Args, env),
}, nil
}
func getRegion(args []string, env map[string]string) string {
if v := getFlagValue(args, "--region"); v != "" {
return v
}
return env["AWS_REGION"]
}
func getProfile(args []string, env map[string]string) string {
if v := getFlagValue(args, "--profile"); v != "" {
return v
}
return env["AWS_PROFILE"]
}
func getClusterName(args []string) string {
return getFlagValue(args, "--cluster-name")
}
func getFlagValue(args []string, flag string) string {
for i := range args {
if args[i] == flag && len(args) > i+1 {
return args[i+1]
}
}
return ""
}
func execEnvToMap(env []api.ExecEnvVar) map[string]string {
out := make(map[string]string)
for _, v := range env {
out[v.Name] = v.Value
}
return out
}