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service.go
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package pool
import (
"context"
"fmt"
"net/url"
"sync"
"time"
"github.com/vipnode/vipnode/internal/pretty"
"github.com/vipnode/vipnode/jsonrpc2"
"github.com/vipnode/vipnode/pool/balance"
"github.com/vipnode/vipnode/pool/store"
"github.com/vipnode/vipnode/request"
)
type hostService struct {
store.Node
jsonrpc2.Service
}
// New returns a new VipnodePool RPC service with the given storage driver and
// balance manager. If manager is nil, then balance.NoBalance{} is used.
func New(storeDriver store.Store, manager balance.Manager) *VipnodePool {
if manager == nil {
manager = balance.NoBalance{}
}
return &VipnodePool{
Store: storeDriver,
BalanceManager: manager,
remoteHosts: map[store.NodeID]jsonrpc2.Service{},
}
}
const poolWhitelistTimeout = 5 * time.Second
// VipnodePool implements a Pool service with balance tracking.
type VipnodePool struct {
// Version is returned as the PoolVersion in the ClientResponse when a new client connects.
Version string
Store store.Store
BalanceManager balance.Manager
ClientMessager func(nodeID string) string
// skipWhitelist is used for testing.
skipWhitelist bool
mu sync.Mutex
remoteHosts map[store.NodeID]jsonrpc2.Service
}
func (p *VipnodePool) verify(sig string, method string, nodeID string, nonce int64, args ...interface{}) error {
// TODO: Switch nonce to strictly timestamp within X time
// TODO: Switch NodeID to pubkey?
if err := p.Store.CheckAndSaveNonce(nodeID, nonce); err != nil {
return VerifyFailedError{Cause: err, Method: method}
}
if err := request.Verify(sig, method, nodeID, nonce, args...); err != nil {
return VerifyFailedError{Cause: err, Method: method}
}
return nil
}
func (p *VipnodePool) disconnectPeers(ctx context.Context, nodeID string, peers []store.Node) error {
callCtx, cancel := context.WithTimeout(ctx, poolWhitelistTimeout)
defer cancel()
errCh := make(chan error, 1)
count := 0
p.mu.Lock()
for _, peer := range peers {
if remote, ok := p.remoteHosts[peer.ID]; ok {
count += 1
go func() {
errCh <- remote.Call(callCtx, nil, "vipnode_disconnect", nodeID)
}()
}
}
p.mu.Unlock()
errors := []error{}
for i := 0; i < count; i++ {
err := <-errCh
if err != nil {
errors = append(errors, err)
}
}
if len(errors) > 0 {
return RemoteHostErrors{
Method: "vipnode_disconnect",
Errors: errors,
}
}
return nil
}
// Update submits a list of peers that the node is connected to, returning the current account balance.
func (p *VipnodePool) Update(ctx context.Context, sig string, nodeID string, nonce int64, req UpdateRequest) (*UpdateResponse, error) {
// TODO: Send sync status?
if err := p.verify(sig, "vipnode_update", nodeID, nonce, req); err != nil {
return nil, err
}
node, err := p.Store.GetNode(store.NodeID(nodeID))
if err != nil {
return nil, err
}
nodeBeforeUpdate := *node
peers := req.Peers
inactive, err := p.Store.UpdateNodePeers(store.NodeID(nodeID), peers, req.BlockNumber)
if err != nil {
return nil, err
}
resp := UpdateResponse{
InvalidPeers: make([]string, 0, len(inactive)),
}
for _, peer := range inactive {
resp.InvalidPeers = append(resp.InvalidPeers, string(peer))
}
validPeers, err := p.Store.NodePeers(store.NodeID(nodeID))
if err != nil {
return nil, err
}
// FIXME: Is there a bug here when a host is connected to another host?
// TODO: Test InvalidPeers
nodeBalance, err := p.BalanceManager.OnUpdate(nodeBeforeUpdate, validPeers)
if err != nil {
if _, ok := err.(balance.LowBalanceError); ok {
disconnectErr := p.disconnectPeers(ctx, nodeID, validPeers)
if disconnectErr != nil {
logger.Printf("Client disconnect due to low balance: %q; disconnect RPC errors: %s", pretty.Abbrev(nodeID), disconnectErr)
} else {
logger.Printf("Client disconnect due to low balance: %q", pretty.Abbrev(nodeID))
}
}
return nil, err
}
resp.Balance = &nodeBalance
if node.IsHost {
logger.Printf("Host update %q: %d peers, %d active, %d invalid. Balance: %d", pretty.Abbrev(nodeID), len(peers), len(validPeers), len(inactive), &nodeBalance.Credit)
} else {
logger.Printf("Client update %q: %d peers, %d active, %d invalid: Balance: %d", pretty.Abbrev(nodeID), len(peers), len(validPeers), len(inactive), &nodeBalance.Credit)
}
return &resp, nil
}
// Host registers a full node to participate as a vipnode host in this pool.
func (p *VipnodePool) Host(ctx context.Context, sig string, nodeID string, nonce int64, req HostRequest) (*HostResponse, error) {
// TODO: Send capabilities?
if err := p.verify(sig, "vipnode_host", nodeID, nonce, req); err != nil {
return nil, err
}
service, err := jsonrpc2.CtxService(ctx)
if err != nil {
return nil, err
}
remoteHost := ""
if withAddr, ok := service.(interface{ RemoteAddr() string }); ok {
remoteHost = (&url.URL{Host: withAddr.RemoteAddr()}).Hostname()
}
defaultPort := "30303"
nodeURI, err := normalizeNodeURI(req.NodeURI, nodeID, remoteHost, defaultPort)
if err != nil {
return nil, err
}
// TODO: Confirm that it's a full node, not a light node? Doesn't super matter since if i
// XXX: Check versions
logger.Printf("New %q host: %q", req.Kind, nodeURI)
node := store.Node{
ID: store.NodeID(nodeID),
URI: nodeURI,
Kind: req.Kind,
LastSeen: time.Now(),
IsHost: true,
Payout: store.Account(req.Payout),
}
err = p.Store.SetNode(node)
if err != nil {
return nil, err
}
// FIXME: Clean up disconnected hosts
p.mu.Lock()
p.remoteHosts[node.ID] = service
p.mu.Unlock()
resp := &HostResponse{
PoolVersion: p.Version,
}
return resp, nil
}
// Client returns a list of enodes who are ready for the client node to connect.
func (p *VipnodePool) Client(ctx context.Context, sig string, nodeID string, nonce int64, req ClientRequest) (*ClientResponse, error) {
if err := p.verify(sig, "vipnode_client", nodeID, nonce, req); err != nil {
return nil, err
}
kind := req.Kind
// TODO: Unhardcode this, maybe add to ClientRequest (but limit to some number)
numRequestHosts := 3
response := &ClientResponse{
PoolVersion: p.Version,
}
if p.ClientMessager != nil {
response.Message = p.ClientMessager(nodeID)
}
node := store.Node{
ID: store.NodeID(nodeID),
Kind: kind,
LastSeen: time.Now(),
IsHost: false,
}
if err := p.Store.SetNode(node); err != nil {
return nil, err
}
if err := p.BalanceManager.OnClient(node); err != nil {
return nil, err
}
r, err := p.Store.ActiveHosts(kind, numRequestHosts)
if err != nil {
return nil, err
}
if len(r) == 0 {
logger.Printf("New %q client: %q (no active hosts found)", kind, pretty.Abbrev(nodeID))
return nil, NoHostNodesError{}
}
if p.skipWhitelist {
logger.Printf("New %q client: %q (%d hosts found, skipping whitelist)", kind, pretty.Abbrev(nodeID), len(r))
response.Hosts = r
return response, nil
}
errors := []error{}
remotes := make([]hostService, 0, len(r))
p.mu.Lock()
for _, node := range r {
remote, ok := p.remoteHosts[node.ID]
if ok {
remotes = append(remotes, hostService{
node, remote,
})
} else {
errors = append(errors, fmt.Errorf("missing remote service for candidate host: %q", node.ID))
}
}
p.mu.Unlock()
accepted := make([]store.Node, 0, len(remotes))
callCtx, cancel := context.WithTimeout(ctx, poolWhitelistTimeout)
// Parallelize whitelist, return any hosts that respond within the timeout.
errChan := make(chan error)
acceptChan := make(chan store.Node)
for _, remote := range remotes {
go func(service jsonrpc2.Service, node store.Node) {
if err := service.Call(callCtx, nil, "vipnode_whitelist", nodeID); err != nil {
errChan <- err
} else {
acceptChan <- node
}
}(remote.Service, remote.Node)
}
for i := len(remotes); i > 0; i-- {
select {
case node := <-acceptChan:
accepted = append(accepted, node)
case err := <-errChan:
errors = append(errors, err)
}
}
cancel()
// TODO: Penalize hosts that failed to respond within the deadline?
if len(errors) > 0 {
logger.Printf("New %q client: %s (%d hosts found, %d accepted) %s", kind, nodeID[:8], len(remotes), len(accepted), RemoteHostErrors{"vipnode_whitelist", errors})
} else {
logger.Printf("New %q client: %s (%d hosts found, %d accepted)", kind, nodeID[:8], len(remotes), len(accepted))
}
if len(accepted) >= 1 {
response.Hosts = accepted
return response, nil
}
if len(errors) > 0 {
return nil, RemoteHostErrors{"vipnode_whitelist", errors}
}
return nil, NoHostNodesError{len(r)}
}
// Ping returns "pong", used for testing.
func (p *VipnodePool) Ping(ctx context.Context) string {
return "pong"
}