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sshk3s.go
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sshk3s.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 k3s
import (
"context"
"fmt"
"io"
"google.golang.org/grpc/codes"
"google.golang.org/protobuf/proto"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/tools/clientcmd/api"
"namespacelabs.dev/foundation/framework/kubernetes/kubeclient"
"namespacelabs.dev/foundation/framework/rpcerrors"
"namespacelabs.dev/foundation/internal/build/registry"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/internal/runtime/kubernetes/client"
"namespacelabs.dev/foundation/internal/ssh"
"namespacelabs.dev/foundation/std/cfg"
"namespacelabs.dev/foundation/std/tasks"
"namespacelabs.dev/foundation/universe/k3s/configuration"
)
var (
clusterConfigType = cfg.DefineConfigType[*configuration.SshEndpoint]()
)
func Register() {
client.RegisterConfigurationProvider("k3s-ssh", provideCluster)
cfg.RegisterConfigurationProvider(func(remote *configuration.Remote) ([]proto.Message, error) {
if remote.Endpoint == nil {
return nil, fnerrors.BadInputError("remote must be specified")
}
if remote.Registry == "" {
return nil, fnerrors.BadInputError("registry must be specified")
}
messages := []proto.Message{
&client.HostEnv{Provider: "k3s-ssh"},
®istry.Registry{
Url: remote.Registry,
Transport: ®istry.RegistryTransport{
Ssh: ®istry.RegistryTransport_SSH{
User: remote.Endpoint.User,
PrivateKeyPath: remote.Endpoint.PrivateKeyPath,
SshAddr: remote.Endpoint.Address,
},
},
},
remote.Endpoint,
}
return messages, nil
})
}
func provideCluster(ctx context.Context, cfg cfg.Configuration) (client.ClusterConfiguration, error) {
conf, ok := clusterConfigType.CheckGet(cfg)
if !ok {
return client.ClusterConfiguration{}, fnerrors.InternalError("missing configuration")
}
// XXX use ssh tunnel
config, err := makeRemoteConfig(ctx, fmt.Sprintf("https://%s:6443", conf.Address), ssh.Endpoint{
User: conf.User,
PrivateKeyPath: conf.PrivateKeyPath,
Address: conf.Address,
})
if err != nil {
return client.ClusterConfiguration{}, err
}
return client.ClusterConfiguration{
Config: *config,
}, nil
}
func makeRemoteConfig(ctx context.Context, publicEndpoint string, endpoint ssh.Endpoint) (*api.Config, error) {
return tasks.Return(ctx, tasks.Action("k3s.fetch-remote-config").Arg("endpoint", endpoint.Address), func(ctx context.Context) (*api.Config, error) {
deferred, err := ssh.Establish(ctx, endpoint)
if err != nil {
return nil, err
}
conn, err := deferred.Dial()
if err != nil {
return nil, err
}
session, err := conn.NewSession()
if err != nil {
return nil, err
}
defer session.Close()
r, err := session.StdoutPipe()
if err != nil {
return nil, err
}
if err := session.Run("cat /etc/rancher/k3s/k3s.yaml"); err != nil {
return nil, err
}
contents, err := io.ReadAll(r)
if err != nil {
return nil, err
}
return decodeKubeConfig(publicEndpoint, contents)
})
}
func decodeKubeConfig(endpoint string, kubeData []byte) (*api.Config, error) {
cfg, err := clientcmd.Load(kubeData)
if err != nil {
return nil, err
}
cluster := cfg.Clusters["default"]
user := cfg.AuthInfos["default"]
if cluster == nil {
return nil, rpcerrors.Errorf(codes.FailedPrecondition, "cluster data is missing")
}
if user == nil {
return nil, rpcerrors.Errorf(codes.FailedPrecondition, "user data is missing")
}
return kubeclient.MakeApiConfig(&kubeclient.StaticConfig{
EndpointAddress: endpoint,
CertificateAuthorityData: cluster.CertificateAuthorityData,
ClientCertificateData: user.ClientCertificateData,
ClientKeyData: user.ClientKeyData,
}), nil
}