lnd.xprv/lnrpc/autopilotrpc/autopilot_server.go
2019-01-23 09:05:43 +01:00

220 lines
5.8 KiB
Go

// +build autopilotrpc
package autopilotrpc
import (
"context"
"encoding/hex"
"os"
"sync/atomic"
"github.com/btcsuite/btcd/btcec"
"github.com/lightningnetwork/lnd/autopilot"
"github.com/lightningnetwork/lnd/lnrpc"
"google.golang.org/grpc"
"gopkg.in/macaroon-bakery.v2/bakery"
)
const (
// subServerName is the name of the sub rpc server. We'll use this name
// to register ourselves, and we also require that the main
// SubServerConfigDispatcher instance recognize tt as the name of our
// RPC service.
subServerName = "AutopilotRPC"
)
var (
// macPermissions maps RPC calls to the permissions they require.
macPermissions = map[string][]bakery.Op{
"/autopilotrpc.Autopilot/Status": {{
Entity: "info",
Action: "read",
}},
"/autopilotrpc.Autopilot/ModifyStatus": {{
Entity: "onchain",
Action: "write",
}, {
Entity: "offchain",
Action: "write",
}},
"/autopilotrpc.Autopilot/QueryScores": {{
Entity: "info",
Action: "read",
}},
}
)
// Server is a sub-server of the main RPC server: the autopilot RPC. This sub
// RPC server allows external callers to access the status of the autopilot
// currently active within lnd, as well as configuring it at runtime.
type Server struct {
started int32 // To be used atomically.
shutdown int32 // To be used atomically.
cfg *Config
manager *autopilot.Manager
}
// A compile time check to ensure that Server fully implements the
// AutopilotServer gRPC service.
var _ AutopilotServer = (*Server)(nil)
// fileExists reports whether the named file or directory exists.
func fileExists(name string) bool {
if _, err := os.Stat(name); err != nil {
if os.IsNotExist(err) {
return false
}
}
return true
}
// New returns a new instance of the autopilotrpc Autopilot sub-server. We also
// return the set of permissions for the macaroons that we may create within
// this method. If the macaroons we need aren't found in the filepath, then
// we'll create them on start up. If we're unable to locate, or create the
// macaroons we need, then we'll return with an error.
func New(cfg *Config) (*Server, lnrpc.MacaroonPerms, error) {
// We don't create any new macaroons for this subserver, instead reuse
// existing onchain/offchain permissions.
server := &Server{
cfg: cfg,
manager: cfg.Manager,
}
return server, macPermissions, nil
}
// Start launches any helper goroutines required for the Server to function.
//
// NOTE: This is part of the lnrpc.SubServer interface.
func (s *Server) Start() error {
if atomic.AddInt32(&s.started, 1) != 1 {
return nil
}
return s.manager.Start()
}
// Stop signals any active goroutines for a graceful closure.
//
// NOTE: This is part of the lnrpc.SubServer interface.
func (s *Server) Stop() error {
if atomic.AddInt32(&s.shutdown, 1) != 1 {
return nil
}
return s.manager.Stop()
}
// Name returns a unique string representation of the sub-server. This can be
// used to identify the sub-server and also de-duplicate them.
//
// NOTE: This is part of the lnrpc.SubServer interface.
func (s *Server) Name() string {
return subServerName
}
// RegisterWithRootServer will be called by the root gRPC server to direct a
// sub RPC server to register itself with the main gRPC root server. Until this
// is called, each sub-server won't be able to have
// requests routed towards it.
//
// NOTE: This is part of the lnrpc.SubServer interface.
func (s *Server) RegisterWithRootServer(grpcServer *grpc.Server) error {
// We make sure that we register it with the main gRPC server to ensure
// all our methods are routed properly.
RegisterAutopilotServer(grpcServer, s)
log.Debugf("Autopilot RPC server successfully register with root " +
"gRPC server")
return nil
}
// Status returns the current status of the autopilot agent.
//
// NOTE: Part of the AutopilotServer interface.
func (s *Server) Status(ctx context.Context,
in *StatusRequest) (*StatusResponse, error) {
return &StatusResponse{
Active: s.manager.IsActive(),
}, nil
}
// ModifyStatus activates the current autopilot agent, if active.
//
// NOTE: Part of the AutopilotServer interface.
func (s *Server) ModifyStatus(ctx context.Context,
in *ModifyStatusRequest) (*ModifyStatusResponse, error) {
log.Debugf("Setting agent enabled=%v", in.Enable)
var err error
if in.Enable {
err = s.manager.StartAgent()
} else {
err = s.manager.StopAgent()
}
return &ModifyStatusResponse{}, err
}
// QueryScores queries all available autopilot heuristics, in addition to any
// active combination of these heruristics, for the scores they would give to
// the given nodes.
//
// NOTE: Part of the AutopilotServer interface.
func (s *Server) QueryScores(ctx context.Context, in *QueryScoresRequest) (
*QueryScoresResponse, error) {
var nodes []autopilot.NodeID
for _, pubStr := range in.Pubkeys {
pubHex, err := hex.DecodeString(pubStr)
if err != nil {
return nil, err
}
pubKey, err := btcec.ParsePubKey(pubHex, btcec.S256())
if err != nil {
return nil, err
}
nID := autopilot.NewNodeID(pubKey)
nodes = append(nodes, nID)
}
// Query the heuristics.
heuristicScores, err := s.manager.QueryHeuristics(nodes)
if err != nil {
return nil, err
}
resp := &QueryScoresResponse{}
for heuristic, scores := range heuristicScores {
result := &QueryScoresResponse_HeuristicResult{
Heuristic: heuristic,
Scores: make(map[string]float64),
}
for pub, score := range scores {
pubkeyHex := hex.EncodeToString(pub[:])
result.Scores[pubkeyHex] = score
}
// Since a node not being part of the internally returned
// scores imply a zero score, we add these before we return the
// RPC results.
for _, node := range nodes {
if _, ok := scores[node]; ok {
continue
}
pubkeyHex := hex.EncodeToString(node[:])
result.Scores[pubkeyHex] = 0.0
}
resp.Results = append(resp.Results, result)
}
return resp, nil
}