cerc-io/plugeth
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ethstats: implement block history retrievals

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This commit is contained in:
Péter Szilágyi 2016-12-11 23:53:22 +02:00
parent 13614f4e1c
commit b2c226cb7d
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GPG Key ID: 119A76381CCB7DD2
1 changed files with 190 additions and 38 deletions
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216
ethstats/ethstats.go
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@ -42,6 +42,10 @@ import (
"golang.org/x/net/websocket"
)
// historyUpdateRange is the number of blocks a node should report upon login or
// history request.
const historyUpdateRange = 50
// Service implements an Ethereum netstats reporting daemon that pushes local
// chain statistics up to a monitoring server.
type Service struct {
@ -54,6 +58,9 @@ type Service struct {
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.
@ -71,6 +78,8 @@ func New(url string, ethServ *eth.Ethereum, lesServ *les.LightEthereum) (*Servic
node: parts[1],
pass: parts[3],
host: parts[4],
pongCh: make(chan struct{}),
histCh: make(chan []uint64, 1),
}, nil
}
@ -135,22 +144,34 @@ func (s *Service) loop() {
time.Sleep(10 * time.Second)
continue
}
if err = s.report(in, out); err != nil {
go s.readLoop(conn, in)
// Send the initial stats so our node looks decent from the get go
if err = s.report(out); err != nil {
glog.V(logger.Warn).Infof("Initial stats report failed: %v", err)
conn.Close()
continue
}
if err = s.reportHistory(out, nil); err != nil {
glog.V(logger.Warn).Infof("History report failed: %v", err)
conn.Close()
continue
}
// Keep sending status updates until the connection breaks
fullReport := time.NewTicker(15 * time.Second)
for err == nil {
select {
case <-fullReport.C:
if err = s.report(in, out); err != nil {
if err = s.report(out); err != nil {
glog.V(logger.Warn).Infof("Full stats report failed: %v", err)
}
case head := <-headSub.Chan():
if head == nil { // node stopped
case list := <-s.histCh:
if err = s.reportHistory(out, list); err != nil {
glog.V(logger.Warn).Infof("Block history report failed: %v", err)
}
case head, ok := <-headSub.Chan():
if !ok { // node stopped
conn.Close()
return
}
@ -160,8 +181,8 @@ func (s *Service) loop() {
if err = s.reportPending(out); err != nil {
glog.V(logger.Warn).Infof("Post-block transaction stats report failed: %v", err)
}
case ev := <-txSub.Chan():
if ev == nil { // node stopped
case _, ok := <-txSub.Chan():
if !ok { // node stopped
conn.Close()
return
}
@ -183,6 +204,76 @@ func (s *Service) loop() {
}
}
// 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, in *json.Decoder) {
// 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 := in.Decode(&msg); err != nil {
glog.V(logger.Warn).Infof("Failed to decode stats server message: %v", err)
return
}
if len(msg["emit"]) == 0 {
glog.V(logger.Warn).Infof("Stats server sent non-broadcast: %v", msg)
return
}
command, ok := msg["emit"][0].(string)
if !ok {
glog.V(logger.Warn).Infof("Invalid stats server message type: %v", 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
glog.V(logger.Warn).Infof("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 {
glog.V(logger.Warn).Infof("Invalid history request: %v", msg["emit"][1])
return
}
list, ok := request["list"].([]interface{})
if !ok {
glog.V(logger.Warn).Infof("Invalid history block list: %v", 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 {
glog.V(logger.Warn).Infof("Invalid history block number: %v", num)
return
}
numbers[i] = uint64(n)
}
select {
case s.histCh <- numbers:
continue
default:
}
}
// Report anything else and continue
glog.V(logger.Info).Infof("Unknown stats message: %v", msg)
}
}
// nodeInfo is the collection of metainformation about a node that is displayed
// on the monitoring page.
type nodeInfo struct {
@ -195,6 +286,7 @@ type nodeInfo struct {
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.
@ -229,6 +321,7 @@ func (s *Service) login(in *json.Decoder, out *json.Encoder) error {
Os: runtime.GOOS,
OsVer: runtime.GOARCH,
Client: "0.1.1",
History: true,
},
Secret: s.pass,
}
@ -249,8 +342,8 @@ func (s *Service) login(in *json.Decoder, out *json.Encoder) error {
// 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(in *json.Decoder, out *json.Encoder) error {
if err := s.reportLatency(in, out); err != nil {
func (s *Service) report(out *json.Encoder) error {
if err := s.reportLatency(out); err != nil {
return err
}
if err := s.reportBlock(out, nil); err != nil {
@ -267,7 +360,7 @@ func (s *Service) report(in *json.Decoder, out *json.Encoder) error {
// reportLatency sends a ping request to the server, measures the RTT time and
// finally sends a latency update.
func (s *Service) reportLatency(in *json.Decoder, out *json.Encoder) error {
func (s *Service) reportLatency(out *json.Encoder) error {
// Send the current time to the ethstats server
start := time.Now()
@ -281,9 +374,12 @@ func (s *Service) reportLatency(in *json.Decoder, out *json.Encoder) error {
return err
}
// Wait for the pong request to arrive back
var pong map[string][]interface{}
if err := in.Decode(&pong); err != nil || len(pong["emit"]) != 2 || pong["emit"][0].(string) != "node-pong" {
return errors.New("unexpected ping reply")
select {
case <-s.pongCh:
// Pong delivered, report the latency
case <-time.After(3 * time.Second):
// Ping timeout, abort
return errors.New("ping timed out")
}
// Send back the measured latency
latency := map[string][]interface{}{
@ -336,9 +432,26 @@ func (s uncleStats) MarshalJSON() ([]byte, error) {
// reportBlock retrieves the current chain head and repors it to the stats server.
func (s *Service) reportBlock(out *json.Encoder, block *types.Block) error {
// Gather the head block infos from the local blockchain
// Assemble the block stats report and send it to the server
stats := map[string]interface{}{
"id": s.node,
"block": s.assembleBlockStats(block),
}
report := map[string][]interface{}{
"emit": []interface{}{"block", stats},
}
if err := out.Encode(report); err != nil {
return err
}
return nil
}
// 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 (
head *types.Header
header *types.Header
td *big.Int
txs []*types.Transaction
uncles []*types.Header
@ -348,38 +461,77 @@ func (s *Service) reportBlock(out *json.Encoder, block *types.Block) error {
if block == nil {
block = s.eth.BlockChain().CurrentBlock()
}
head = block.Header()
td = s.eth.BlockChain().GetTd(head.Hash(), head.Number.Uint64())
header = block.Header()
td = s.eth.BlockChain().GetTd(header.Hash(), header.Number.Uint64())
txs = block.Transactions()
uncles = block.Uncles()
} else {
// Light nodes would need on-demand lookups for transactions/uncles, skip
if block != nil {
head = block.Header()
header = block.Header()
} else {
head = s.les.BlockChain().CurrentHeader()
header = s.les.BlockChain().CurrentHeader()
}
td = s.les.BlockChain().GetTd(head.Hash(), head.Number.Uint64())
td = s.les.BlockChain().GetTd(header.Hash(), header.Number.Uint64())
}
// Assemble the block stats report and send it to the server
stats := map[string]interface{}{
"id": s.node,
"block": &blockStats{
Number: head.Number,
Hash: head.Hash(),
Timestamp: head.Time,
Miner: head.Coinbase,
GasUsed: new(big.Int).Set(head.GasUsed),
GasLimit: new(big.Int).Set(head.GasLimit),
Diff: head.Difficulty.String(),
// Assemble and return the block stats
return &blockStats{
Number: header.Number,
Hash: header.Hash(),
Timestamp: header.Time,
Miner: header.Coinbase,
GasUsed: new(big.Int).Set(header.GasUsed),
GasLimit: new(big.Int).Set(header.GasLimit),
Diff: header.Difficulty.String(),
TotalDiff: td.String(),
Txs: txs,
Uncles: uncles,
},
}
}
// reportHistory retrieves the most recent batch of blocks and reports it to the
// stats server.
func (s *Service) reportHistory(out *json.Encoder, 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
for _, idx := range list {
indexes = append(indexes, idx)
}
} else {
// No indexes requested, send back the top ones
var head *types.Header
if s.eth != nil {
head = s.eth.BlockChain().CurrentHeader()
} else {
head = s.les.BlockChain().CurrentHeader()
}
start := head.Number.Int64() - historyUpdateRange
if start < 0 {
start = 0
}
for i := uint64(start); i <= head.Number.Uint64(); i++ {
indexes = append(indexes, i)
}
}
// Gather the batch of blocks to report
history := make([]*blockStats, len(indexes))
for i, number := range indexes {
if s.eth != nil {
history[i] = s.assembleBlockStats(s.eth.BlockChain().GetBlockByNumber(number))
} else {
history[i] = s.assembleBlockStats(types.NewBlockWithHeader(s.les.BlockChain().GetHeaderByNumber(number)))
}
}
// Assemble the history report and send it to the server
stats := map[string]interface{}{
"id": s.node,
"history": history,
}
report := map[string][]interface{}{
"emit": []interface{}{"block", stats},
"emit": []interface{}{"history", stats},
}
if err := out.Encode(report); err != nil {
return err