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rpc: add pub/sub support

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This commit is contained in:
Bas van Kervel
2016-03-29 15:07:40 +02:00
parent fb578f4550
commit f7328c5ecb
16 changed files with 849 additions and 315 deletions
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212
eth/api.go
View File

@ -28,6 +28,8 @@ import (
"sync"
"time"
"golang.org/x/net/context"
"github.com/ethereum/ethash"
"github.com/ethereum/go-ethereum/accounts"
"github.com/ethereum/go-ethereum/common"
@ -457,16 +459,46 @@ func (s *PrivateAccountAPI) LockAccount(addr common.Address) bool {
// It offers only methods that operate on public data that is freely available to anyone.
type PublicBlockChainAPI struct {
config *core.ChainConfig
bc *core.BlockChain
chainDb ethdb.Database
eventMux *event.TypeMux
am *accounts.Manager
miner *miner.Miner
bc *core.BlockChain
chainDb ethdb.Database
eventMux *event.TypeMux
muNewBlockSubscriptions sync.Mutex // protects newBlocksSubscriptions
newBlockSubscriptions map[string]func(core.ChainEvent) error // callbacks for new block subscriptions
am *accounts.Manager
miner *miner.Miner
}
// NewPublicBlockChainAPI creates a new Etheruem blockchain API.
func NewPublicBlockChainAPI(config *core.ChainConfig, bc *core.BlockChain, m *miner.Miner, chainDb ethdb.Database, eventMux *event.TypeMux, am *accounts.Manager) *PublicBlockChainAPI {
return &PublicBlockChainAPI{config: config, bc: bc, miner: m, chainDb: chainDb, eventMux: eventMux, am: am}
api := &PublicBlockChainAPI{
config: config,
bc: bc,
miner: m,
chainDb: chainDb,
eventMux: eventMux,
am: am,
newBlockSubscriptions: make(map[string]func(core.ChainEvent) error),
}
go api.subscriptionLoop()
return api
}
// subscriptionLoop reads events from the global event mux and creates notifications for the matched subscriptions.
func (s *PublicBlockChainAPI) subscriptionLoop() {
sub := s.eventMux.Subscribe(core.ChainEvent{})
for event := range sub.Chan() {
if chainEvent, ok := event.Data.(core.ChainEvent); ok {
s.muNewBlockSubscriptions.Lock()
for id, notifyOf := range s.newBlockSubscriptions {
if notifyOf(chainEvent) == rpc.ErrNotificationNotFound {
delete(s.newBlockSubscriptions, id)
}
}
s.muNewBlockSubscriptions.Unlock()
}
}
}
// BlockNumber returns the block number of the chain head.
@ -564,20 +596,36 @@ type NewBlocksArgs struct {
// NewBlocks triggers a new block event each time a block is appended to the chain. It accepts an argument which allows
// the caller to specify whether the output should contain transactions and in what format.
func (s *PublicBlockChainAPI) NewBlocks(args NewBlocksArgs) (rpc.Subscription, error) {
sub := s.eventMux.Subscribe(core.ChainEvent{})
output := func(rawBlock interface{}) interface{} {
if event, ok := rawBlock.(core.ChainEvent); ok {
notification, err := s.rpcOutputBlock(event.Block, args.IncludeTransactions, args.TransactionDetails)
if err == nil {
return notification
}
}
return rawBlock
func (s *PublicBlockChainAPI) NewBlocks(ctx context.Context, args NewBlocksArgs) (rpc.Subscription, error) {
notifier, supported := ctx.Value(rpc.NotifierContextKey).(rpc.Notifier)
if !supported {
return nil, rpc.ErrNotificationsUnsupported
}
return rpc.NewSubscriptionWithOutputFormat(sub, output), nil
// create a subscription that will remove itself when unsubscribed/cancelled
subscription, err := notifier.NewSubscription(func(subId string) {
s.muNewBlockSubscriptions.Lock()
delete(s.newBlockSubscriptions, subId)
s.muNewBlockSubscriptions.Unlock()
})
if err != nil {
return nil, err
}
// add a callback that is called on chain events which will format the block and notify the client
s.muNewBlockSubscriptions.Lock()
s.newBlockSubscriptions[subscription.ID()] = func(e core.ChainEvent) error {
if notification, err := s.rpcOutputBlock(e.Block, args.IncludeTransactions, args.TransactionDetails); err == nil {
return subscription.Notify(notification)
} else {
glog.V(logger.Warn).Info("unable to format block %v\n", err)
}
return nil
}
s.muNewBlockSubscriptions.Unlock()
return subscription, nil
}
// GetCode returns the code stored at the given address in the state for the given block number.
@ -821,26 +869,75 @@ func newRPCTransaction(b *types.Block, txHash common.Hash) (*RPCTransaction, err
// PublicTransactionPoolAPI exposes methods for the RPC interface
type PublicTransactionPoolAPI struct {
eventMux *event.TypeMux
chainDb ethdb.Database
gpo *GasPriceOracle
bc *core.BlockChain
miner *miner.Miner
am *accounts.Manager
txPool *core.TxPool
txMu sync.Mutex
eventMux *event.TypeMux
chainDb ethdb.Database
gpo *GasPriceOracle
bc *core.BlockChain
miner *miner.Miner
am *accounts.Manager
txPool *core.TxPool
txMu sync.Mutex
muPendingTxSubs sync.Mutex
pendingTxSubs map[string]rpc.Subscription
}
// NewPublicTransactionPoolAPI creates a new RPC service with methods specific for the transaction pool.
func NewPublicTransactionPoolAPI(e *Ethereum) *PublicTransactionPoolAPI {
return &PublicTransactionPoolAPI{
eventMux: e.EventMux(),
gpo: NewGasPriceOracle(e),
chainDb: e.ChainDb(),
bc: e.BlockChain(),
am: e.AccountManager(),
txPool: e.TxPool(),
miner: e.Miner(),
api := &PublicTransactionPoolAPI{
eventMux: e.EventMux(),
gpo: NewGasPriceOracle(e),
chainDb: e.ChainDb(),
bc: e.BlockChain(),
am: e.AccountManager(),
txPool: e.TxPool(),
miner: e.Miner(),
pendingTxSubs: make(map[string]rpc.Subscription),
}
go api.subscriptionLoop()
return api
}
// subscriptionLoop listens for events on the global event mux and creates notifications for subscriptions.
func (s *PublicTransactionPoolAPI) subscriptionLoop() {
sub := s.eventMux.Subscribe(core.TxPreEvent{})
accountTimeout := time.NewTicker(10 * time.Second)
// only publish pending tx signed by one of the accounts in the node
accountSet := set.New()
accounts, _ := s.am.Accounts()
for _, acc := range accounts {
accountSet.Add(acc.Address)
}
for {
select {
case event := <-sub.Chan():
if event == nil {
continue
}
tx := event.Data.(core.TxPreEvent)
if from, err := tx.Tx.FromFrontier(); err == nil {
if accountSet.Has(from) {
s.muPendingTxSubs.Lock()
for id, sub := range s.pendingTxSubs {
if sub.Notify(tx.Tx.Hash()) == rpc.ErrNotificationNotFound {
delete(s.pendingTxSubs, id)
}
}
s.muPendingTxSubs.Unlock()
}
}
case <-accountTimeout.C:
// refresh account list when accounts are added/removed from the node.
if accounts, err := s.am.Accounts(); err == nil {
accountSet.Clear()
for _, acc := range accounts {
accountSet.Add(acc.Address)
}
}
}
}
}
@ -1275,40 +1372,27 @@ func (s *PublicTransactionPoolAPI) PendingTransactions() ([]*RPCTransaction, err
// NewPendingTransaction creates a subscription that is triggered each time a transaction enters the transaction pool
// and is send from one of the transactions this nodes manages.
func (s *PublicTransactionPoolAPI) NewPendingTransactions() (rpc.Subscription, error) {
sub := s.eventMux.Subscribe(core.TxPreEvent{})
func (s *PublicTransactionPoolAPI) NewPendingTransactions(ctx context.Context) (rpc.Subscription, error) {
notifier, supported := ctx.Value(rpc.NotifierContextKey).(rpc.Notifier)
if !supported {
return nil, rpc.ErrNotificationsUnsupported
}
subscription, err := notifier.NewSubscription(func(id string) {
s.muPendingTxSubs.Lock()
delete(s.pendingTxSubs, id)
s.muPendingTxSubs.Unlock()
})
accounts, err := s.am.Accounts()
if err != nil {
return rpc.Subscription{}, err
}
accountSet := set.New()
for _, account := range accounts {
accountSet.Add(account.Address)
}
accountSetLastUpdates := time.Now()
output := func(transaction interface{}) interface{} {
if time.Since(accountSetLastUpdates) > (time.Duration(2) * time.Second) {
if accounts, err = s.am.Accounts(); err != nil {
accountSet.Clear()
for _, account := range accounts {
accountSet.Add(account.Address)
}
accountSetLastUpdates = time.Now()
}
}
tx := transaction.(core.TxPreEvent)
if from, err := tx.Tx.FromFrontier(); err == nil {
if accountSet.Has(from) {
return tx.Tx.Hash()
}
}
return nil
return nil, err
}
return rpc.NewSubscriptionWithOutputFormat(sub, output), nil
s.muPendingTxSubs.Lock()
s.pendingTxSubs[subscription.ID()] = subscription
s.muPendingTxSubs.Unlock()
return subscription, nil
}
// Resend accepts an existing transaction and a new gas price and limit. It will remove the given transaction from the

2
eth/backend.go
View File

@ -310,7 +310,7 @@ func (s *Ethereum) APIs() []rpc.API {
}, {
Namespace: "eth",
Version: "1.0",
Service: downloader.NewPublicDownloaderAPI(s.Downloader()),
Service: downloader.NewPublicDownloaderAPI(s.Downloader(), s.EventMux()),
Public: true,
}, {
Namespace: "miner",

77
eth/downloader/api.go
View File

@ -17,18 +17,55 @@
package downloader
import (
"sync"
"golang.org/x/net/context"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/rpc"
)
// PublicDownloaderAPI provides an API which gives information about the current synchronisation status.
// It offers only methods that operates on data that can be available to anyone without security risks.
type PublicDownloaderAPI struct {
d *Downloader
d *Downloader
mux *event.TypeMux
muSyncSubscriptions sync.Mutex
syncSubscriptions map[string]rpc.Subscription
}
// NewPublicDownloaderAPI create a new PublicDownloaderAPI.
func NewPublicDownloaderAPI(d *Downloader) *PublicDownloaderAPI {
return &PublicDownloaderAPI{d}
func NewPublicDownloaderAPI(d *Downloader, m *event.TypeMux) *PublicDownloaderAPI {
api := &PublicDownloaderAPI{d: d, mux: m, syncSubscriptions: make(map[string]rpc.Subscription)}
go api.run()
return api
}
func (api *PublicDownloaderAPI) run() {
sub := api.mux.Subscribe(StartEvent{}, DoneEvent{}, FailedEvent{})
for event := range sub.Chan() {
var notification interface{}
switch event.Data.(type) {
case StartEvent:
result := &SyncingResult{Syncing: true}
result.Status.Origin, result.Status.Current, result.Status.Height, result.Status.Pulled, result.Status.Known = api.d.Progress()
notification = result
case DoneEvent, FailedEvent:
notification = false
}
api.muSyncSubscriptions.Lock()
for id, sub := range api.syncSubscriptions {
if sub.Notify(notification) == rpc.ErrNotificationNotFound {
delete(api.syncSubscriptions, id)
}
}
api.muSyncSubscriptions.Unlock()
}
}
// Progress gives progress indications when the node is synchronising with the Ethereum network.
@ -47,19 +84,25 @@ type SyncingResult struct {
}
// Syncing provides information when this nodes starts synchronising with the Ethereum network and when it's finished.
func (s *PublicDownloaderAPI) Syncing() (rpc.Subscription, error) {
sub := s.d.mux.Subscribe(StartEvent{}, DoneEvent{}, FailedEvent{})
output := func(event interface{}) interface{} {
switch event.(type) {
case StartEvent:
result := &SyncingResult{Syncing: true}
result.Status.Origin, result.Status.Current, result.Status.Height, result.Status.Pulled, result.Status.Known = s.d.Progress()
return result
case DoneEvent, FailedEvent:
return false
}
return nil
func (api *PublicDownloaderAPI) Syncing(ctx context.Context) (rpc.Subscription, error) {
notifier, supported := ctx.Value(rpc.NotifierContextKey).(rpc.Notifier)
if !supported {
return nil, rpc.ErrNotificationsUnsupported
}
return rpc.NewSubscriptionWithOutputFormat(sub, output), nil
subscription, err := notifier.NewSubscription(func(id string) {
api.muSyncSubscriptions.Lock()
delete(api.syncSubscriptions, id)
api.muSyncSubscriptions.Unlock()
})
if err != nil {
return nil, err
}
api.muSyncSubscriptions.Lock()
api.syncSubscriptions[subscription.ID()] = subscription
api.muSyncSubscriptions.Unlock()
return subscription, nil
}

79
eth/filters/api.go
View File

@ -17,15 +17,13 @@
package filters
import (
"sync"
"time"
"crypto/rand"
"encoding/hex"
"errors"
"encoding/json"
"errors"
"fmt"
"sync"
"time"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
@ -33,6 +31,8 @@ import (
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/event"
"github.com/ethereum/go-ethereum/rpc"
"golang.org/x/net/context"
)
var (
@ -202,7 +202,7 @@ func (s *PublicFilterAPI) NewPendingTransactionFilter() (string, error) {
}
// newLogFilter creates a new log filter.
func (s *PublicFilterAPI) newLogFilter(earliest, latest int64, addresses []common.Address, topics [][]common.Hash) (int, error) {
func (s *PublicFilterAPI) newLogFilter(earliest, latest int64, addresses []common.Address, topics [][]common.Hash, callback func(log *vm.Log, removed bool)) (int, error) {
s.logMu.Lock()
defer s.logMu.Unlock()
@ -219,17 +219,70 @@ func (s *PublicFilterAPI) newLogFilter(earliest, latest int64, addresses []commo
filter.SetAddresses(addresses)
filter.SetTopics(topics)
filter.LogCallback = func(log *vm.Log, removed bool) {
s.logMu.Lock()
defer s.logMu.Unlock()
if queue := s.logQueue[id]; queue != nil {
queue.add(vmlog{log, removed})
if callback != nil {
callback(log, removed)
} else {
s.logMu.Lock()
defer s.logMu.Unlock()
if queue := s.logQueue[id]; queue != nil {
queue.add(vmlog{log, removed})
}
}
}
return id, nil
}
func (s *PublicFilterAPI) Logs(ctx context.Context, args NewFilterArgs) (rpc.Subscription, error) {
notifier, supported := ctx.Value(rpc.NotifierContextKey).(rpc.Notifier)
if !supported {
return nil, rpc.ErrNotificationsUnsupported
}
var (
externalId string
subscription rpc.Subscription
err error
)
if externalId, err = newFilterId(); err != nil {
return nil, err
}
// uninstall filter when subscription is unsubscribed/cancelled
if subscription, err = notifier.NewSubscription(func(string) {
s.UninstallFilter(externalId)
}); err != nil {
return nil, err
}
notifySubscriber := func(log *vm.Log, removed bool) {
rpcLog := toRPCLogs(vm.Logs{log}, removed)
if err := subscription.Notify(rpcLog); err != nil {
subscription.Cancel()
}
}
// from and to block number are not used since subscriptions don't allow you to travel to "time"
var id int
if len(args.Addresses) > 0 {
id, err = s.newLogFilter(-1, -1, args.Addresses, args.Topics, notifySubscriber)
} else {
id, err = s.newLogFilter(-1, -1, nil, args.Topics, notifySubscriber)
}
if err != nil {
subscription.Cancel()
return nil, err
}
s.filterMapMu.Lock()
s.filterMapping[externalId] = id
s.filterMapMu.Unlock()
return subscription, err
}
// NewFilterArgs represents a request to create a new filter.
type NewFilterArgs struct {
FromBlock rpc.BlockNumber
@ -364,9 +417,9 @@ func (s *PublicFilterAPI) NewFilter(args NewFilterArgs) (string, error) {
var id int
if len(args.Addresses) > 0 {
id, err = s.newLogFilter(args.FromBlock.Int64(), args.ToBlock.Int64(), args.Addresses, args.Topics)
id, err = s.newLogFilter(args.FromBlock.Int64(), args.ToBlock.Int64(), args.Addresses, args.Topics, nil)
} else {
id, err = s.newLogFilter(args.FromBlock.Int64(), args.ToBlock.Int64(), nil, args.Topics)
id, err = s.newLogFilter(args.FromBlock.Int64(), args.ToBlock.Int64(), nil, args.Topics, nil)
}
if err != nil {
return "", err