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discovery.go
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discovery.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package client
import (
"os"
"path/filepath"
"time"
"k8s.io/client-go/discovery"
diskcached "k8s.io/client-go/discovery/cached/disk"
"k8s.io/client-go/rest"
"k8s.io/client-go/restmapper"
"namespacelabs.dev/foundation/internal/support/naming"
"namespacelabs.dev/foundation/internal/workspace/dirs"
)
func NewDiscoveryClient(config *rest.Config, ephemeral bool) (discovery.CachedDiscoveryInterface, error) {
cacheDir, err := makeCacheDir(config.Host, ephemeral)
if err != nil {
return nil, err
}
return diskcached.NewCachedDiscoveryClientForConfig(config, cacheDir, "", time.Duration(6*time.Hour))
}
func NewRESTMapper(config *rest.Config, ephemeral bool) (*restmapper.DeferredDiscoveryRESTMapper, error) {
discoveryClient, err := NewDiscoveryClient(config, ephemeral)
if err != nil {
return nil, err
}
return restmapper.NewDeferredDiscoveryRESTMapper(discoveryClient), nil
}
func makeCacheDir(host string, ephemeral bool) (string, error) {
if ephemeral {
return os.MkdirTemp(os.TempDir(), "kubernetes-discovery")
}
cacheDir, err := dirs.Ensure(dirs.Subdir("kubernetes"))
if err != nil {
return "", err
}
hostID := naming.StableID(host)
discoveryCacheDir := filepath.Join(cacheDir, "discovery", hostID)
return discoveryCacheDir, nil
}