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gke.go
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gke.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 gke
import (
"context"
"encoding/base64"
"fmt"
container "cloud.google.com/go/container/apiv1"
"cloud.google.com/go/container/apiv1/containerpb"
"google.golang.org/api/option"
clientcmdapi "k8s.io/client-go/tools/clientcmd/api"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/networking/ingress"
"namespacelabs.dev/foundation/internal/providers/gcp"
"namespacelabs.dev/foundation/internal/runtime/kubernetes/client"
"namespacelabs.dev/foundation/internal/sdk/gcloud"
"namespacelabs.dev/foundation/std/cfg"
gkepb "namespacelabs.dev/foundation/universe/gcp/gke"
)
var clusterConfigType = cfg.DefineConfigType[*gkepb.Cluster]()
func Register() {
client.RegisterConfigurationProvider("gke", provideGKE)
client.RegisterConfigurationProvider("gcp/gke", provideGKE)
RegisterIngressClass()
}
func RegisterIngressClass() {
ingress.RegisterIngressClass(gclb{})
}
func provideGKE(ctx context.Context, config cfg.Configuration) (client.ClusterConfiguration, error) {
selected, err := ConfiguredCluster(ctx, config)
if err != nil {
return client.ClusterConfiguration{}, err
}
token, err := selected.TokenSource.Token()
if err != nil {
return client.ClusterConfiguration{}, err
}
x, err := Kubeconfig(selected.Cluster, token.AccessToken)
if err != nil {
return client.ClusterConfiguration{}, err
}
return client.ClusterConfiguration{
Config: *x,
TokenProvider: func(ctx context.Context) (string, error) {
token, err := selected.TokenSource.Token()
if err != nil {
return "", err
}
return token.AccessToken, nil
},
SupportedIngressClasses: []string{"nginx", "gclb"},
}, nil
}
type Cluster struct {
Cluster *containerpb.Cluster
ProjectID string
TokenSource *gcloud.TokenSource
}
func ConfiguredCluster(ctx context.Context, config cfg.Configuration) (*Cluster, error) {
conf, ok := clusterConfigType.CheckGet(config)
if !ok {
return nil, fnerrors.BadInputError("gke provider configured, but missing gke.Cluster")
}
project, ok := gcp.ProjectConfigType.CheckGet(config)
if !ok {
return nil, fnerrors.BadInputError("gke provider configured, but missing gcp.Project")
}
ts := gcloud.NewTokenSource(ctx)
c, err := container.NewClusterManagerClient(ctx, option.WithTokenSource(ts))
if err != nil {
return nil, err
}
allClusters, err := c.ListClusters(ctx, &containerpb.ListClustersRequest{
Parent: fmt.Sprintf("projects/%s/locations/-", project.Id),
})
if err != nil {
return nil, err
}
var selected *containerpb.Cluster
for _, cluster := range allClusters.Clusters {
if cluster.Name == conf.Name {
if selected != nil {
return nil, fnerrors.BadInputError("multiple clusters named %q", conf.Name)
}
selected = cluster
}
}
if selected == nil {
return nil, fnerrors.BadInputError("no such cluster %q", conf.Name)
}
return &Cluster{selected, project.Id, ts}, nil
}
func Kubeconfig(cluster *containerpb.Cluster, token string) (*clientcmdapi.Config, error) {
if cluster.Endpoint == "" {
return nil, fnerrors.BadInputError("cluster endpoint is missing")
}
if cluster.GetMasterAuth().GetClusterCaCertificate() == "" {
return nil, fnerrors.BadInputError("cluster is missing a cluster ca certificate")
}
decoded, err := base64.StdEncoding.DecodeString(cluster.GetMasterAuth().GetClusterCaCertificate())
if err != nil {
return nil, fnerrors.BadInputError("failed to parse certificateauthority: %w", err)
}
clusterName := cluster.Name
contextName := clusterName
return &clientcmdapi.Config{
Clusters: map[string]*clientcmdapi.Cluster{
clusterName: {
Server: "https://" + cluster.Endpoint,
CertificateAuthorityData: decoded,
},
},
Contexts: map[string]*clientcmdapi.Context{
contextName: {
Cluster: clusterName,
AuthInfo: contextName,
},
},
CurrentContext: contextName,
AuthInfos: map[string]*clientcmdapi.AuthInfo{
contextName: {
Token: token,
},
},
}, nil
}