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authorDeterminant <[email protected]>2019-08-14 01:37:25 -0400
committerDeterminant <[email protected]>2019-08-14 01:37:25 -0400
commit592f21f5b97e5b1e714f194ae90ab83e6547cf41 (patch)
treec500cdf4ca4266af15703eca182df34d66715918 /ethstats
parentad886faec521f1edcb90f6f8eb4555608d085312 (diff)
finish a full chain example (with p2p network)
Diffstat (limited to 'ethstats')
-rw-r--r--ethstats/ethstats.go717
1 files changed, 717 insertions, 0 deletions
diff --git a/ethstats/ethstats.go b/ethstats/ethstats.go
new file mode 100644
index 0000000..e680b87
--- /dev/null
+++ b/ethstats/ethstats.go
@@ -0,0 +1,717 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+// Package ethstats implements the network stats reporting service.
+package ethstats
+
+import (
+ "context"
+ "encoding/json"
+ "errors"
+ "fmt"
+ "math/big"
+ "net/http"
+ "regexp"
+ "runtime"
+ "strconv"
+ "strings"
+ "time"
+
+ "github.com/ethereum/go-ethereum/common"
+ "github.com/ethereum/go-ethereum/common/mclock"
+ "github.com/ethereum/go-ethereum/consensus"
+ "github.com/ethereum/go-ethereum/core"
+ "github.com/ethereum/go-ethereum/core/types"
+ "github.com/Determinant/coreth/eth"
+ "github.com/ethereum/go-ethereum/event"
+ "github.com/ethereum/go-ethereum/les"
+ "github.com/ethereum/go-ethereum/log"
+ "github.com/ethereum/go-ethereum/p2p"
+ "github.com/ethereum/go-ethereum/rpc"
+ "github.com/gorilla/websocket"
+)
+
+const (
+ // historyUpdateRange is the number of blocks a node should report upon login or
+ // history request.
+ historyUpdateRange = 50
+
+ // txChanSize is the size of channel listening to NewTxsEvent.
+ // The number is referenced from the size of tx pool.
+ txChanSize = 4096
+ // chainHeadChanSize is the size of channel listening to ChainHeadEvent.
+ chainHeadChanSize = 10
+)
+
+type txPool interface {
+ // SubscribeNewTxsEvent should return an event subscription of
+ // NewTxsEvent and send events to the given channel.
+ SubscribeNewTxsEvent(chan<- core.NewTxsEvent) event.Subscription
+}
+
+type blockChain interface {
+ SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription
+}
+
+// Service implements an Ethereum netstats reporting daemon that pushes local
+// chain statistics up to a monitoring server.
+type Service struct {
+ server *p2p.Server // Peer-to-peer server to retrieve networking infos
+ eth *eth.Ethereum // Full Ethereum service if monitoring a full node
+ les *les.LightEthereum // Light Ethereum service if monitoring a light node
+ engine consensus.Engine // Consensus engine to retrieve variadic block fields
+
+ node string // Name of the node to display on the monitoring page
+ pass string // Password to authorize access to the monitoring page
+ host string // Remote address of the monitoring service
+
+ pongCh chan struct{} // Pong notifications are fed into this channel
+ histCh chan []uint64 // History request block numbers are fed into this channel
+}
+
+// New returns a monitoring service ready for stats reporting.
+func New(url string, ethServ *eth.Ethereum, lesServ *les.LightEthereum) (*Service, error) {
+ // Parse the netstats connection url
+ re := regexp.MustCompile("([^:@]*)(:([^@]*))?@(.+)")
+ parts := re.FindStringSubmatch(url)
+ if len(parts) != 5 {
+ return nil, fmt.Errorf("invalid netstats url: \"%s\", should be nodename:secret@host:port", url)
+ }
+ // Assemble and return the stats service
+ var engine consensus.Engine
+ if ethServ != nil {
+ engine = ethServ.Engine()
+ } else {
+ engine = lesServ.Engine()
+ }
+ return &Service{
+ eth: ethServ,
+ les: lesServ,
+ engine: engine,
+ node: parts[1],
+ pass: parts[3],
+ host: parts[4],
+ pongCh: make(chan struct{}),
+ histCh: make(chan []uint64, 1),
+ }, nil
+}
+
+// Protocols implements node.Service, returning the P2P network protocols used
+// by the stats service (nil as it doesn't use the devp2p overlay network).
+func (s *Service) Protocols() []p2p.Protocol { return nil }
+
+// APIs implements node.Service, returning the RPC API endpoints provided by the
+// stats service (nil as it doesn't provide any user callable APIs).
+func (s *Service) APIs() []rpc.API { return nil }
+
+// Start implements node.Service, starting up the monitoring and reporting daemon.
+func (s *Service) Start(server *p2p.Server) error {
+ s.server = server
+ go s.loop()
+
+ log.Info("Stats daemon started")
+ return nil
+}
+
+// Stop implements node.Service, terminating the monitoring and reporting daemon.
+func (s *Service) Stop() error {
+ log.Info("Stats daemon stopped")
+ return nil
+}
+
+// loop keeps trying to connect to the netstats server, reporting chain events
+// until termination.
+func (s *Service) loop() {
+ // Subscribe to chain events to execute updates on
+ var blockchain blockChain
+ var txpool txPool
+ if s.eth != nil {
+ blockchain = s.eth.BlockChain()
+ txpool = s.eth.TxPool()
+ } else {
+ blockchain = s.les.BlockChain()
+ txpool = s.les.TxPool()
+ }
+
+ chainHeadCh := make(chan core.ChainHeadEvent, chainHeadChanSize)
+ headSub := blockchain.SubscribeChainHeadEvent(chainHeadCh)
+ defer headSub.Unsubscribe()
+
+ txEventCh := make(chan core.NewTxsEvent, txChanSize)
+ txSub := txpool.SubscribeNewTxsEvent(txEventCh)
+ defer txSub.Unsubscribe()
+
+ // Start a goroutine that exhausts the subsciptions to avoid events piling up
+ var (
+ quitCh = make(chan struct{})
+ headCh = make(chan *types.Block, 1)
+ txCh = make(chan struct{}, 1)
+ )
+ go func() {
+ var lastTx mclock.AbsTime
+
+ HandleLoop:
+ for {
+ select {
+ // Notify of chain head events, but drop if too frequent
+ case head := <-chainHeadCh:
+ select {
+ case headCh <- head.Block:
+ default:
+ }
+
+ // Notify of new transaction events, but drop if too frequent
+ case <-txEventCh:
+ if time.Duration(mclock.Now()-lastTx) < time.Second {
+ continue
+ }
+ lastTx = mclock.Now()
+
+ select {
+ case txCh <- struct{}{}:
+ default:
+ }
+
+ // node stopped
+ case <-txSub.Err():
+ break HandleLoop
+ case <-headSub.Err():
+ break HandleLoop
+ }
+ }
+ close(quitCh)
+ }()
+ // Loop reporting until termination
+ for {
+ // Resolve the URL, defaulting to TLS, but falling back to none too
+ path := fmt.Sprintf("%s/api", s.host)
+ urls := []string{path}
+
+ // url.Parse and url.IsAbs is unsuitable (https://github.com/golang/go/issues/19779)
+ if !strings.Contains(path, "://") {
+ urls = []string{"wss://" + path, "ws://" + path}
+ }
+ // Establish a websocket connection to the server on any supported URL
+ var (
+ conn *websocket.Conn
+ err error
+ )
+ dialer := websocket.Dialer{HandshakeTimeout: 5 * time.Second}
+ header := make(http.Header)
+ header.Set("origin", "http://localhost")
+ for _, url := range urls {
+ conn, _, err = dialer.Dial(url, header)
+ if err == nil {
+ break
+ }
+ }
+ if err != nil {
+ log.Warn("Stats server unreachable", "err", err)
+ time.Sleep(10 * time.Second)
+ continue
+ }
+ // Authenticate the client with the server
+ if err = s.login(conn); err != nil {
+ log.Warn("Stats login failed", "err", err)
+ conn.Close()
+ time.Sleep(10 * time.Second)
+ continue
+ }
+ go s.readLoop(conn)
+
+ // Send the initial stats so our node looks decent from the get go
+ if err = s.report(conn); err != nil {
+ log.Warn("Initial stats report failed", "err", err)
+ conn.Close()
+ continue
+ }
+ // Keep sending status updates until the connection breaks
+ fullReport := time.NewTicker(15 * time.Second)
+
+ for err == nil {
+ select {
+ case <-quitCh:
+ conn.Close()
+ return
+
+ case <-fullReport.C:
+ if err = s.report(conn); err != nil {
+ log.Warn("Full stats report failed", "err", err)
+ }
+ case list := <-s.histCh:
+ if err = s.reportHistory(conn, list); err != nil {
+ log.Warn("Requested history report failed", "err", err)
+ }
+ case head := <-headCh:
+ if err = s.reportBlock(conn, head); err != nil {
+ log.Warn("Block stats report failed", "err", err)
+ }
+ if err = s.reportPending(conn); err != nil {
+ log.Warn("Post-block transaction stats report failed", "err", err)
+ }
+ case <-txCh:
+ if err = s.reportPending(conn); err != nil {
+ log.Warn("Transaction stats report failed", "err", err)
+ }
+ }
+ }
+ // Make sure the connection is closed
+ conn.Close()
+ }
+}
+
+// readLoop loops as long as the connection is alive and retrieves data packets
+// from the network socket. If any of them match an active request, it forwards
+// it, if they themselves are requests it initiates a reply, and lastly it drops
+// unknown packets.
+func (s *Service) readLoop(conn *websocket.Conn) {
+ // If the read loop exists, close the connection
+ defer conn.Close()
+
+ for {
+ // Retrieve the next generic network packet and bail out on error
+ var msg map[string][]interface{}
+ if err := conn.ReadJSON(&msg); err != nil {
+ log.Warn("Failed to decode stats server message", "err", err)
+ return
+ }
+ log.Trace("Received message from stats server", "msg", msg)
+ if len(msg["emit"]) == 0 {
+ log.Warn("Stats server sent non-broadcast", "msg", msg)
+ return
+ }
+ command, ok := msg["emit"][0].(string)
+ if !ok {
+ log.Warn("Invalid stats server message type", "type", msg["emit"][0])
+ return
+ }
+ // If the message is a ping reply, deliver (someone must be listening!)
+ if len(msg["emit"]) == 2 && command == "node-pong" {
+ select {
+ case s.pongCh <- struct{}{}:
+ // Pong delivered, continue listening
+ continue
+ default:
+ // Ping routine dead, abort
+ log.Warn("Stats server pinger seems to have died")
+ return
+ }
+ }
+ // If the message is a history request, forward to the event processor
+ if len(msg["emit"]) == 2 && command == "history" {
+ // Make sure the request is valid and doesn't crash us
+ request, ok := msg["emit"][1].(map[string]interface{})
+ if !ok {
+ log.Warn("Invalid stats history request", "msg", msg["emit"][1])
+ s.histCh <- nil
+ continue // Ethstats sometime sends invalid history requests, ignore those
+ }
+ list, ok := request["list"].([]interface{})
+ if !ok {
+ log.Warn("Invalid stats history block list", "list", request["list"])
+ return
+ }
+ // Convert the block number list to an integer list
+ numbers := make([]uint64, len(list))
+ for i, num := range list {
+ n, ok := num.(float64)
+ if !ok {
+ log.Warn("Invalid stats history block number", "number", num)
+ return
+ }
+ numbers[i] = uint64(n)
+ }
+ select {
+ case s.histCh <- numbers:
+ continue
+ default:
+ }
+ }
+ // Report anything else and continue
+ log.Info("Unknown stats message", "msg", msg)
+ }
+}
+
+// nodeInfo is the collection of metainformation about a node that is displayed
+// on the monitoring page.
+type nodeInfo struct {
+ Name string `json:"name"`
+ Node string `json:"node"`
+ Port int `json:"port"`
+ Network string `json:"net"`
+ Protocol string `json:"protocol"`
+ API string `json:"api"`
+ Os string `json:"os"`
+ OsVer string `json:"os_v"`
+ Client string `json:"client"`
+ History bool `json:"canUpdateHistory"`
+}
+
+// authMsg is the authentication infos needed to login to a monitoring server.
+type authMsg struct {
+ ID string `json:"id"`
+ Info nodeInfo `json:"info"`
+ Secret string `json:"secret"`
+}
+
+// login tries to authorize the client at the remote server.
+func (s *Service) login(conn *websocket.Conn) error {
+ // Construct and send the login authentication
+ infos := s.server.NodeInfo()
+
+ var network, protocol string
+ if info := infos.Protocols["eth"]; info != nil {
+ network = fmt.Sprintf("%d", info.(*eth.NodeInfo).Network)
+ protocol = fmt.Sprintf("eth/%d", eth.ProtocolVersions[0])
+ } else {
+ network = fmt.Sprintf("%d", infos.Protocols["les"].(*les.NodeInfo).Network)
+ protocol = fmt.Sprintf("les/%d", les.ClientProtocolVersions[0])
+ }
+ auth := &authMsg{
+ ID: s.node,
+ Info: nodeInfo{
+ Name: s.node,
+ Node: infos.Name,
+ Port: infos.Ports.Listener,
+ Network: network,
+ Protocol: protocol,
+ API: "No",
+ Os: runtime.GOOS,
+ OsVer: runtime.GOARCH,
+ Client: "0.1.1",
+ History: true,
+ },
+ Secret: s.pass,
+ }
+ login := map[string][]interface{}{
+ "emit": {"hello", auth},
+ }
+ if err := conn.WriteJSON(login); err != nil {
+ return err
+ }
+ // Retrieve the remote ack or connection termination
+ var ack map[string][]string
+ if err := conn.ReadJSON(&ack); err != nil || len(ack["emit"]) != 1 || ack["emit"][0] != "ready" {
+ return errors.New("unauthorized")
+ }
+ return nil
+}
+
+// report collects all possible data to report and send it to the stats server.
+// This should only be used on reconnects or rarely to avoid overloading the
+// server. Use the individual methods for reporting subscribed events.
+func (s *Service) report(conn *websocket.Conn) error {
+ if err := s.reportLatency(conn); err != nil {
+ return err
+ }
+ if err := s.reportBlock(conn, nil); err != nil {
+ return err
+ }
+ if err := s.reportPending(conn); err != nil {
+ return err
+ }
+ if err := s.reportStats(conn); err != nil {
+ return err
+ }
+ return nil
+}
+
+// reportLatency sends a ping request to the server, measures the RTT time and
+// finally sends a latency update.
+func (s *Service) reportLatency(conn *websocket.Conn) error {
+ // Send the current time to the ethstats server
+ start := time.Now()
+
+ ping := map[string][]interface{}{
+ "emit": {"node-ping", map[string]string{
+ "id": s.node,
+ "clientTime": start.String(),
+ }},
+ }
+ if err := conn.WriteJSON(ping); err != nil {
+ return err
+ }
+ // Wait for the pong request to arrive back
+ select {
+ case <-s.pongCh:
+ // Pong delivered, report the latency
+ case <-time.After(5 * time.Second):
+ // Ping timeout, abort
+ return errors.New("ping timed out")
+ }
+ latency := strconv.Itoa(int((time.Since(start) / time.Duration(2)).Nanoseconds() / 1000000))
+
+ // Send back the measured latency
+ log.Trace("Sending measured latency to ethstats", "latency", latency)
+
+ stats := map[string][]interface{}{
+ "emit": {"latency", map[string]string{
+ "id": s.node,
+ "latency": latency,
+ }},
+ }
+ return conn.WriteJSON(stats)
+}
+
+// blockStats is the information to report about individual blocks.
+type blockStats struct {
+ Number *big.Int `json:"number"`
+ Hash common.Hash `json:"hash"`
+ ParentHash common.Hash `json:"parentHash"`
+ Timestamp *big.Int `json:"timestamp"`
+ Miner common.Address `json:"miner"`
+ GasUsed uint64 `json:"gasUsed"`
+ GasLimit uint64 `json:"gasLimit"`
+ Diff string `json:"difficulty"`
+ TotalDiff string `json:"totalDifficulty"`
+ Txs []txStats `json:"transactions"`
+ TxHash common.Hash `json:"transactionsRoot"`
+ Root common.Hash `json:"stateRoot"`
+ Uncles uncleStats `json:"uncles"`
+}
+
+// txStats is the information to report about individual transactions.
+type txStats struct {
+ Hash common.Hash `json:"hash"`
+}
+
+// uncleStats is a custom wrapper around an uncle array to force serializing
+// empty arrays instead of returning null for them.
+type uncleStats []*types.Header
+
+func (s uncleStats) MarshalJSON() ([]byte, error) {
+ if uncles := ([]*types.Header)(s); len(uncles) > 0 {
+ return json.Marshal(uncles)
+ }
+ return []byte("[]"), nil
+}
+
+// reportBlock retrieves the current chain head and reports it to the stats server.
+func (s *Service) reportBlock(conn *websocket.Conn, block *types.Block) error {
+ // Gather the block details from the header or block chain
+ details := s.assembleBlockStats(block)
+
+ // Assemble the block report and send it to the server
+ log.Trace("Sending new block to ethstats", "number", details.Number, "hash", details.Hash)
+
+ stats := map[string]interface{}{
+ "id": s.node,
+ "block": details,
+ }
+ report := map[string][]interface{}{
+ "emit": {"block", stats},
+ }
+ return conn.WriteJSON(report)
+}
+
+// assembleBlockStats retrieves any required metadata to report a single block
+// and assembles the block stats. If block is nil, the current head is processed.
+func (s *Service) assembleBlockStats(block *types.Block) *blockStats {
+ // Gather the block infos from the local blockchain
+ var (
+ header *types.Header
+ td *big.Int
+ txs []txStats
+ uncles []*types.Header
+ )
+ if s.eth != nil {
+ // Full nodes have all needed information available
+ if block == nil {
+ block = s.eth.BlockChain().CurrentBlock()
+ }
+ header = block.Header()
+ td = s.eth.BlockChain().GetTd(header.Hash(), header.Number.Uint64())
+
+ txs = make([]txStats, len(block.Transactions()))
+ for i, tx := range block.Transactions() {
+ txs[i].Hash = tx.Hash()
+ }
+ uncles = block.Uncles()
+ } else {
+ // Light nodes would need on-demand lookups for transactions/uncles, skip
+ if block != nil {
+ header = block.Header()
+ } else {
+ header = s.les.BlockChain().CurrentHeader()
+ }
+ td = s.les.BlockChain().GetTd(header.Hash(), header.Number.Uint64())
+ txs = []txStats{}
+ }
+ // Assemble and return the block stats
+ author, _ := s.engine.Author(header)
+
+ return &blockStats{
+ Number: header.Number,
+ Hash: header.Hash(),
+ ParentHash: header.ParentHash,
+ Timestamp: new(big.Int).SetUint64(header.Time),
+ Miner: author,
+ GasUsed: header.GasUsed,
+ GasLimit: header.GasLimit,
+ Diff: header.Difficulty.String(),
+ TotalDiff: td.String(),
+ Txs: txs,
+ TxHash: header.TxHash,
+ Root: header.Root,
+ Uncles: uncles,
+ }
+}
+
+// reportHistory retrieves the most recent batch of blocks and reports it to the
+// stats server.
+func (s *Service) reportHistory(conn *websocket.Conn, list []uint64) error {
+ // Figure out the indexes that need reporting
+ indexes := make([]uint64, 0, historyUpdateRange)
+ if len(list) > 0 {
+ // Specific indexes requested, send them back in particular
+ indexes = append(indexes, list...)
+ } else {
+ // No indexes requested, send back the top ones
+ var head int64
+ if s.eth != nil {
+ head = s.eth.BlockChain().CurrentHeader().Number.Int64()
+ } else {
+ head = s.les.BlockChain().CurrentHeader().Number.Int64()
+ }
+ start := head - historyUpdateRange + 1
+ if start < 0 {
+ start = 0
+ }
+ for i := uint64(start); i <= uint64(head); i++ {
+ indexes = append(indexes, i)
+ }
+ }
+ // Gather the batch of blocks to report
+ history := make([]*blockStats, len(indexes))
+ for i, number := range indexes {
+ // Retrieve the next block if it's known to us
+ var block *types.Block
+ if s.eth != nil {
+ block = s.eth.BlockChain().GetBlockByNumber(number)
+ } else {
+ if header := s.les.BlockChain().GetHeaderByNumber(number); header != nil {
+ block = types.NewBlockWithHeader(header)
+ }
+ }
+ // If we do have the block, add to the history and continue
+ if block != nil {
+ history[len(history)-1-i] = s.assembleBlockStats(block)
+ continue
+ }
+ // Ran out of blocks, cut the report short and send
+ history = history[len(history)-i:]
+ break
+ }
+ // Assemble the history report and send it to the server
+ if len(history) > 0 {
+ log.Trace("Sending historical blocks to ethstats", "first", history[0].Number, "last", history[len(history)-1].Number)
+ } else {
+ log.Trace("No history to send to stats server")
+ }
+ stats := map[string]interface{}{
+ "id": s.node,
+ "history": history,
+ }
+ report := map[string][]interface{}{
+ "emit": {"history", stats},
+ }
+ return conn.WriteJSON(report)
+}
+
+// pendStats is the information to report about pending transactions.
+type pendStats struct {
+ Pending int `json:"pending"`
+}
+
+// reportPending retrieves the current number of pending transactions and reports
+// it to the stats server.
+func (s *Service) reportPending(conn *websocket.Conn) error {
+ // Retrieve the pending count from the local blockchain
+ var pending int
+ if s.eth != nil {
+ pending, _ = s.eth.TxPool().Stats()
+ } else {
+ pending = s.les.TxPool().Stats()
+ }
+ // Assemble the transaction stats and send it to the server
+ log.Trace("Sending pending transactions to ethstats", "count", pending)
+
+ stats := map[string]interface{}{
+ "id": s.node,
+ "stats": &pendStats{
+ Pending: pending,
+ },
+ }
+ report := map[string][]interface{}{
+ "emit": {"pending", stats},
+ }
+ return conn.WriteJSON(report)
+}
+
+// nodeStats is the information to report about the local node.
+type nodeStats struct {
+ Active bool `json:"active"`
+ Syncing bool `json:"syncing"`
+ Mining bool `json:"mining"`
+ Hashrate int `json:"hashrate"`
+ Peers int `json:"peers"`
+ GasPrice int `json:"gasPrice"`
+ Uptime int `json:"uptime"`
+}
+
+// reportPending retrieves various stats about the node at the networking and
+// mining layer and reports it to the stats server.
+func (s *Service) reportStats(conn *websocket.Conn) error {
+ // Gather the syncing and mining infos from the local miner instance
+ var (
+ mining bool
+ hashrate int
+ syncing bool
+ gasprice int
+ )
+ if s.eth != nil {
+ mining = s.eth.Miner().Mining()
+ hashrate = int(s.eth.Miner().HashRate())
+
+ sync := s.eth.Downloader().Progress()
+ syncing = s.eth.BlockChain().CurrentHeader().Number.Uint64() >= sync.HighestBlock
+
+ price, _ := s.eth.APIBackend.SuggestPrice(context.Background())
+ gasprice = int(price.Uint64())
+ } else {
+ sync := s.les.Downloader().Progress()
+ syncing = s.les.BlockChain().CurrentHeader().Number.Uint64() >= sync.HighestBlock
+ }
+ // Assemble the node stats and send it to the server
+ log.Trace("Sending node details to ethstats")
+
+ stats := map[string]interface{}{
+ "id": s.node,
+ "stats": &nodeStats{
+ Active: true,
+ Mining: mining,
+ Hashrate: hashrate,
+ Peers: s.server.PeerCount(),
+ GasPrice: gasprice,
+ Syncing: syncing,
+ Uptime: 100,
+ },
+ }
+ report := map[string][]interface{}{
+ "emit": {"stats", stats},
+ }
+ return conn.WriteJSON(report)
+}