func (n *Node) initManagerConnection(ctx context.Context, ready chan<- struct{}) error {
opts := []grpc.DialOption{}
insecureCreds := credentials.NewTLS(&tls.Config{InsecureSkipVerify: true})
opts = append(opts, grpc.WithTransportCredentials(insecureCreds))
// Using listen address instead of advertised address because this is a
// local connection.
addr := n.config.ListenControlAPI
opts = append(opts, grpc.WithDialer(
func(addr string, timeout time.Duration) (net.Conn, error) {
return net.DialTimeout("unix", addr, timeout)
}))
conn, err := grpc.Dial(addr, opts...)
if err != nil {
return err
}
client := api.NewHealthClient(conn)
for {
resp, err := client.Check(ctx, &api.HealthCheckRequest{Service: "ControlAPI"})
if err != nil {
return err
}
if resp.Status == api.HealthCheckResponse_SERVING {
break
}
time.Sleep(500 * time.Millisecond)
}
n.setControlSocket(conn)
if ready != nil {
close(ready)
}
return nil
}
// checkHealth tries to contact an aspiring member through its advertised address
// and checks if its raft server is running.
func (n *Node) checkHealth(ctx context.Context, addr string, timeout time.Duration) error {
conn, err := dial(addr, "tcp", n.tlsCredentials, timeout)
if err != nil {
return err
}
if timeout != 0 {
tctx, cancel := context.WithTimeout(ctx, timeout)
defer cancel()
ctx = tctx
}
client := api.NewHealthClient(conn)
defer conn.Close()
resp, err := client.Check(ctx, &api.HealthCheckRequest{Service: "Raft"})
if err != nil {
return ErrHealthCheckFailure
}
if resp != nil && resp.Status != api.HealthCheckResponse_SERVING {
return ErrHealthCheckFailure
}
return nil
}
func healthCheckConn(ctx context.Context, cc *grpc.ClientConn) error {
resp, err := api.NewHealthClient(cc).Check(ctx, &api.HealthCheckRequest{Service: "Raft"})
if err != nil {
return errors.Wrap(err, "failed to check health")
}
if resp.Status != api.HealthCheckResponse_SERVING {
return errors.Errorf("health check returned status %s", resp.Status)
}
return nil
}
// HealthCheck sends a health check RPC to the member and returns the response.
func (member *Member) HealthCheck(ctx context.Context) error {
healthClient := api.NewHealthClient(member.Conn)
resp, err := healthClient.Check(ctx, &api.HealthCheckRequest{Service: "Raft"})
if err != nil {
return err
}
if resp.Status != api.HealthCheckResponse_SERVING {
return fmt.Errorf("health check returned status %s", resp.Status.String())
}
return nil
}