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client.go
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client.go
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package headscale
import (
"context"
"fmt"
"log/slog"
"strings"
"time"
headscalev1 "github.com/juanfont/headscale/gen/go/headscale/v1"
"github.com/juanfont/headscale/hscontrol"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
timestamppb "google.golang.org/protobuf/types/known/timestamppb"
)
type HeadscaleClient struct {
client headscalev1.HeadscaleServiceClient
address string
controlPlaneAddress string
conn *grpc.ClientConn
logger *slog.Logger
}
func NewHeadscaleClient(addr, controlPlaneAddr, apiKey string, logger *slog.Logger) (client *HeadscaleClient, err error) {
if addr != "" || apiKey != "" {
if addr == "" {
return nil, fmt.Errorf("headscale address should be set with api key")
}
if apiKey == "" {
return nil, fmt.Errorf("headscale api key should be set with address")
}
} else {
return
}
h := &HeadscaleClient{
address: addr,
controlPlaneAddress: controlPlaneAddr,
logger: logger,
}
if err = h.connect(apiKey); err != nil {
return nil, fmt.Errorf("failed to connect to Headscale server: %w", err)
}
return h, nil
}
// Connect or reconnect to Headscale server
func (h *HeadscaleClient) connect(apiKey string) (err error) {
ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
grpcOptions := []grpc.DialOption{
grpc.WithBlock(),
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithPerRPCCredentials(tokenAuth{
token: apiKey,
}),
}
h.conn, err = grpc.DialContext(ctx, h.address, grpcOptions...)
if err != nil {
return fmt.Errorf("failed to connect to headscale server %s: %w", h.address, err)
}
h.client = headscalev1.NewHeadscaleServiceClient(h.conn)
return
}
func (h *HeadscaleClient) GetControlPlaneAddress() string {
return h.controlPlaneAddress
}
func (h *HeadscaleClient) UserExists(ctx context.Context, name string) bool {
req := &headscalev1.GetUserRequest{
Name: name,
}
if _, err := h.client.GetUser(ctx, req); err != nil {
return false
}
return true
}
func (h *HeadscaleClient) CreateUser(ctx context.Context, name string) error {
req := &headscalev1.CreateUserRequest{
Name: name,
}
_, err := h.client.CreateUser(ctx, req)
// TODO: this error check is pretty rough, but it's not easily possible to compare the proto error directly :/
if err != nil && !strings.Contains(err.Error(), hscontrol.ErrUserExists.Error()) {
return fmt.Errorf("failed to create new VPN user: %w", err)
}
return nil
}
func (h *HeadscaleClient) CreatePreAuthKey(ctx context.Context, user string, expiration time.Time, isEphemeral bool) (key string, err error) {
req := &headscalev1.CreatePreAuthKeyRequest{
User: user,
Expiration: timestamppb.New(expiration),
Ephemeral: isEphemeral,
}
resp, err := h.client.CreatePreAuthKey(ctx, req)
if err != nil || resp == nil || resp.PreAuthKey == nil {
return "", fmt.Errorf("failed to create new Auth Key: %w", err)
}
return resp.PreAuthKey.Key, nil
}
type connectedMap map[string]bool
func (h *HeadscaleClient) MachinesConnected(ctx context.Context) (connectedMap, error) {
resp, err := h.client.ListMachines(ctx, &headscalev1.ListMachinesRequest{})
if err != nil || resp == nil {
return nil, fmt.Errorf("failed to list machines: %w", err)
}
result := connectedMap{}
for _, m := range resp.Machines {
result[m.Name] = m.Online
}
return result, nil
}
// DeleteMachine removes the node entry from headscale DB
func (h *HeadscaleClient) DeleteMachine(ctx context.Context, machineID, projectID string) (err error) {
machine, err := h.getMachine(ctx, machineID, projectID)
if err != nil || machine == nil {
return err
}
req := &headscalev1.DeleteMachineRequest{
MachineId: machine.Id,
}
if _, err := h.client.DeleteMachine(ctx, req); err != nil {
return fmt.Errorf("failed to delete machine: %w", err)
}
return nil
}
func (h *HeadscaleClient) getMachine(ctx context.Context, machineID, projectID string) (machine *headscalev1.Machine, err error) {
req := &headscalev1.ListMachinesRequest{
User: projectID,
}
resp, err := h.client.ListMachines(ctx, req)
if err != nil || resp == nil {
return nil, fmt.Errorf("failed to list machines: %w", err)
}
for _, m := range resp.Machines {
if m.Name == machineID {
return m, nil
}
}
return nil, nil
}
// Close client
func (h *HeadscaleClient) Close() error {
return h.conn.Close()
}