From c528e3e3cf934f10ab23e603233c9b23848913a5 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?P=C3=A9ter=20Szil=C3=A1gyi?= Date: Fri, 21 Sep 2018 13:15:09 +0300 Subject: cmd/faucet: cache internal state, avoid sync-trashing les --- cmd/faucet/faucet.go | 112 ++++++++++++++++++++++++++++++--------------------- 1 file changed, 67 insertions(+), 45 deletions(-) (limited to 'cmd/faucet') diff --git a/cmd/faucet/faucet.go b/cmd/faucet/faucet.go index cfe4e45f1..e17ac36f5 100644 --- a/cmd/faucet/faucet.go +++ b/cmd/faucet/faucet.go @@ -199,6 +199,8 @@ type faucet struct { keystore *keystore.KeyStore // Keystore containing the single signer account accounts.Account // Account funding user faucet requests + head *types.Header // Current head header of the faucet + balance *big.Int // Current balance of the faucet nonce uint64 // Current pending nonce of the faucet price *big.Int // Current gas price to issue funds with @@ -324,33 +326,30 @@ func (f *faucet) apiHandler(conn *websocket.Conn) { nonce uint64 err error ) - for { - // Attempt to retrieve the stats, may error on no faucet connectivity - ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second) - head, err = f.client.HeaderByNumber(ctx, nil) - if err == nil { - balance, err = f.client.BalanceAt(ctx, f.account.Address, head.Number) - if err == nil { - nonce, err = f.client.NonceAt(ctx, f.account.Address, nil) - } + for head == nil || balance == nil { + // Retrieve the current stats cached by the faucet + f.lock.RLock() + if f.head != nil { + head = types.CopyHeader(f.head) } - cancel() + if f.balance != nil { + balance = new(big.Int).Set(f.balance) + } + nonce = f.nonce + f.lock.RUnlock() - // If stats retrieval failed, wait a bit and retry - if err != nil { - if err = sendError(conn, errors.New("Faucet offline: "+err.Error())); err != nil { + if head == nil || balance == nil { + // Report the faucet offline until initial stats are ready + if err = sendError(conn, errors.New("Faucet offline")); err != nil { log.Warn("Failed to send faucet error to client", "err", err) return } time.Sleep(3 * time.Second) - continue } - // Initial stats reported successfully, proceed with user interaction - break } // Send over the initial stats and the latest header if err = send(conn, map[string]interface{}{ - "funds": balance.Div(balance, ether), + "funds": new(big.Int).Div(balance, ether), "funded": nonce, "peers": f.stack.Server().PeerCount(), "requests": f.reqs, @@ -520,6 +519,47 @@ func (f *faucet) apiHandler(conn *websocket.Conn) { } } +// refresh attempts to retrieve the latest header from the chain and extract the +// associated faucet balance and nonce for connectivity caching. +func (f *faucet) refresh(head *types.Header) error { + // Ensure a state update does not run for too long + ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) + defer cancel() + + // If no header was specified, use the current chain head + var err error + if head == nil { + if head, err = f.client.HeaderByNumber(ctx, nil); err != nil { + return err + } + } + // Retrieve the balance, nonce and gas price from the current head + var ( + balance *big.Int + nonce uint64 + price *big.Int + ) + if balance, err = f.client.BalanceAt(ctx, f.account.Address, head.Number); err != nil { + return err + } + if nonce, err = f.client.NonceAt(ctx, f.account.Address, head.Number); err != nil { + return err + } + if price, err = f.client.SuggestGasPrice(ctx); err != nil { + return err + } + // Everything succeeded, update the cached stats and eject old requests + f.lock.Lock() + f.head, f.balance = head, balance + f.price, f.nonce = price, nonce + for len(f.reqs) > 0 && f.reqs[0].Tx.Nonce() < f.nonce { + f.reqs = f.reqs[1:] + } + f.lock.Unlock() + + return nil +} + // loop keeps waiting for interesting events and pushes them out to connected // websockets. func (f *faucet) loop() { @@ -537,45 +577,27 @@ func (f *faucet) loop() { go func() { for head := range update { // New chain head arrived, query the current stats and stream to clients - var ( - balance *big.Int - nonce uint64 - price *big.Int - err error - ) - ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second) - balance, err = f.client.BalanceAt(ctx, f.account.Address, head.Number) - if err == nil { - nonce, err = f.client.NonceAt(ctx, f.account.Address, nil) - if err == nil { - price, err = f.client.SuggestGasPrice(ctx) - } + timestamp := time.Unix(head.Time.Int64(), 0) + if time.Since(timestamp) > time.Hour { + log.Warn("Skipping faucet refresh, head too old", "number", head.Number, "hash", head.Hash(), "age", common.PrettyAge(timestamp)) + continue } - cancel() - - // If querying the data failed, try for the next block - if err != nil { + if err := f.refresh(head); err != nil { log.Warn("Failed to update faucet state", "block", head.Number, "hash", head.Hash(), "err", err) continue - } else { - log.Info("Updated faucet state", "block", head.Number, "hash", head.Hash(), "balance", balance, "nonce", nonce, "price", price) } // Faucet state retrieved, update locally and send to clients - balance = new(big.Int).Div(balance, ether) + f.lock.RLock() + log.Info("Updated faucet state", "number", head.Number, "hash", head.Hash(), "age", common.PrettyAge(timestamp), "balance", f.balance, "nonce", f.nonce, "price", f.price) - f.lock.Lock() - f.price, f.nonce = price, nonce - for len(f.reqs) > 0 && f.reqs[0].Tx.Nonce() < f.nonce { - f.reqs = f.reqs[1:] - } - f.lock.Unlock() + balance := new(big.Int).Div(f.balance, ether) + peers := f.stack.Server().PeerCount() - f.lock.RLock() for _, conn := range f.conns { if err := send(conn, map[string]interface{}{ "funds": balance, "funded": f.nonce, - "peers": f.stack.Server().PeerCount(), + "peers": peers, "requests": f.reqs, }, time.Second); err != nil { log.Warn("Failed to send stats to client", "err", err) -- cgit v1.2.3 From 30cd5c18549f645002aedb4c00e5bab683cb0835 Mon Sep 17 00:00:00 2001 From: Felix Lange Date: Tue, 25 Sep 2018 00:59:00 +0200 Subject: all: new p2p node representation (#17643) Package p2p/enode provides a generalized representation of p2p nodes which can contain arbitrary information in key/value pairs. It is also the new home for the node database. The "v4" identity scheme is also moved here from p2p/enr to remove the dependency on Ethereum crypto from that package. Record signature handling is changed significantly. The identity scheme registry is removed and acceptable schemes must be passed to any method that needs identity. This means records must now be validated explicitly after decoding. The enode API is designed to make signature handling easy and safe: most APIs around the codebase work with enode.Node, which is a wrapper around a valid record. Going from enr.Record to enode.Node requires a valid signature. * p2p/discover: port to p2p/enode This ports the discovery code to the new node representation in p2p/enode. The wire protocol is unchanged, this can be considered a refactoring change. The Kademlia table can now deal with nodes using an arbitrary identity scheme. This requires a few incompatible API changes: - Table.Lookup is not available anymore. It used to take a public key as argument because v4 protocol requires one. Its replacement is LookupRandom. - Table.Resolve takes *enode.Node instead of NodeID. This is also for v4 protocol compatibility because nodes cannot be looked up by ID alone. - Types Node and NodeID are gone. Further commits in the series will be fixes all over the the codebase to deal with those removals. * p2p: port to p2p/enode and discovery changes This adapts package p2p to the changes in p2p/discover. All uses of discover.Node and discover.NodeID are replaced by their equivalents from p2p/enode. New API is added to retrieve the enode.Node instance of a peer. The behavior of Server.Self with discovery disabled is improved. It now tries much harder to report a working IP address, falling back to 127.0.0.1 if no suitable address can be determined through other means. These changes were needed for tests of other packages later in the series. * p2p/simulations, p2p/testing: port to p2p/enode No surprises here, mostly replacements of discover.Node, discover.NodeID with their new equivalents. The 'interesting' API changes are: - testing.ProtocolSession tracks complete nodes, not just their IDs. - adapters.NodeConfig has a new method to create a complete node. These changes were needed to make swarm tests work. Note that the NodeID change makes the code incompatible with old simulation snapshots. * whisper/whisperv5, whisper/whisperv6: port to p2p/enode This port was easy because whisper uses []byte for node IDs and URL strings in the API. * eth: port to p2p/enode Again, easy to port because eth uses strings for node IDs and doesn't care about node information in any way. * les: port to p2p/enode Apart from replacing discover.NodeID with enode.ID, most changes are in the server pool code. It now deals with complete nodes instead of (Pubkey, IP, Port) triples. The database format is unchanged for now, but we should probably change it to use the node database later. * node: port to p2p/enode This change simply replaces discover.Node and discover.NodeID with their new equivalents. * swarm/network: port to p2p/enode Swarm has its own node address representation, BzzAddr, containing both an overlay address (the hash of a secp256k1 public key) and an underlay address (enode:// URL). There are no changes to the BzzAddr format in this commit, but certain operations such as creating a BzzAddr from a node ID are now impossible because node IDs aren't public keys anymore. Most swarm-related changes in the series remove uses of NewAddrFromNodeID, replacing it with NewAddr which takes a complete node as argument. ToOverlayAddr is removed because we can just use the node ID directly. --- cmd/faucet/faucet.go | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'cmd/faucet') diff --git a/cmd/faucet/faucet.go b/cmd/faucet/faucet.go index e17ac36f5..2ffe12276 100644 --- a/cmd/faucet/faucet.go +++ b/cmd/faucet/faucet.go @@ -54,8 +54,8 @@ import ( "github.com/ethereum/go-ethereum/log" "github.com/ethereum/go-ethereum/node" "github.com/ethereum/go-ethereum/p2p" - "github.com/ethereum/go-ethereum/p2p/discover" "github.com/ethereum/go-ethereum/p2p/discv5" + "github.com/ethereum/go-ethereum/p2p/enode" "github.com/ethereum/go-ethereum/p2p/nat" "github.com/ethereum/go-ethereum/params" "golang.org/x/net/websocket" @@ -255,8 +255,10 @@ func newFaucet(genesis *core.Genesis, port int, enodes []*discv5.Node, network u return nil, err } for _, boot := range enodes { - old, _ := discover.ParseNode(boot.String()) - stack.Server().AddPeer(old) + old, err := enode.ParseV4(boot.String()) + if err != nil { + stack.Server().AddPeer(old) + } } // Attach to the client and retrieve and interesting metadatas api, err := stack.Attach() -- cgit v1.2.3