mirror of
https://gitlab.com/pulsechaincom/erigon-pulse.git
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775 lines
23 KiB
Go
775 lines
23 KiB
Go
// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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// Package ethstats implements the network stats reporting service.
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package ethstats
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/*
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import (
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"context"
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"encoding/json"
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"errors"
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"fmt"
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"math/big"
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"net/http"
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"regexp"
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"runtime"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/gorilla/websocket"
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"github.com/ledgerwatch/erigon/common"
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"github.com/ledgerwatch/erigon/common/mclock"
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"github.com/ledgerwatch/erigon/consensus"
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"github.com/ledgerwatch/erigon/core"
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"github.com/ledgerwatch/erigon/core/types"
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"github.com/ledgerwatch/erigon/eth"
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"github.com/ledgerwatch/erigon/eth/downloader"
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"github.com/ledgerwatch/erigon/event"
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"github.com/ledgerwatch/erigon/log"
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"github.com/ledgerwatch/erigon/miner"
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"github.com/ledgerwatch/erigon/node"
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"github.com/ledgerwatch/erigon/p2p"
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"github.com/ledgerwatch/erigon/rpc"
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)
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const (
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// historyUpdateRange is the number of blocks a node should report upon login or
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// history request.
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historyUpdateRange = 50
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// txChanSize is the size of channel listening to NewTxsEvent.
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// The number is referenced from the size of tx pool.
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txChanSize = 4096
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// chainHeadChanSize is the size of channel listening to ChainHeadEvent.
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chainHeadChanSize = 10
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)
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// backend encompasses the bare-minimum functionality needed for ethstats reporting
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type backend interface {
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SubscribeChainHeadEvent(ch chan<- core.ChainHeadEvent) event.Subscription
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SubscribeNewTxsEvent(ch chan<- core.NewTxsEvent) event.Subscription
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CurrentHeader() *types.Header
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HeaderByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Header, error)
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GetTd(ctx context.Context, hash common.Hash) *big.Int
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Stats() (pending int, queued int)
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Downloader() *downloader.Downloader
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}
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// fullNodeBackend encompasses the functionality necessary for a full node
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// reporting to ethstats
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type fullNodeBackend interface {
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backend
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Miner() *miner.Miner
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BlockByNumber(ctx context.Context, number rpc.BlockNumber) (*types.Block, error)
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CurrentBlock() *types.Block
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SuggestPrice(ctx context.Context) (*big.Int, error)
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}
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// Service implements an Ethereum netstats reporting daemon that pushes local
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// chain statistics up to a monitoring server.
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type Service struct {
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server *p2p.Server // Peer-to-peer server to retrieve networking infos
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backend backend
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engine consensus.Engine // Consensus engine to retrieve variadic block fields
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node string // Name of the node to display on the monitoring page
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pass string // Password to authorize access to the monitoring page
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host string // Remote address of the monitoring service
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pongCh chan struct{} // Pong notifications are fed into this channel
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histCh chan []uint64 // History request block numbers are fed into this channel
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}
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// connWrapper is a wrapper to prevent concurrent-write or concurrent-read on the
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// websocket.
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//
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// From Gorilla websocket docs:
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// Connections support one concurrent reader and one concurrent writer.
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// Applications are responsible for ensuring that no more than one goroutine calls the write methods
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// - NextWriter, SetWriteDeadline, WriteMessage, WriteJSON, EnableWriteCompression, SetCompressionLevel
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// concurrently and that no more than one goroutine calls the read methods
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// - NextReader, SetReadDeadline, ReadMessage, ReadJSON, SetPongHandler, SetPingHandler
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// concurrently.
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// The Close and WriteControl methods can be called concurrently with all other methods.
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type connWrapper struct {
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conn *websocket.Conn
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rlock sync.Mutex
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wlock sync.Mutex
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}
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func newConnectionWrapper(conn *websocket.Conn) *connWrapper {
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return &connWrapper{conn: conn}
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}
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// WriteJSON wraps corresponding method on the websocket but is safe for concurrent calling
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func (w *connWrapper) WriteJSON(v interface{}) error {
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w.wlock.Lock()
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defer w.wlock.Unlock()
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return w.conn.WriteJSON(v)
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}
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// ReadJSON wraps corresponding method on the websocket but is safe for concurrent calling
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func (w *connWrapper) ReadJSON(v interface{}) error {
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w.rlock.Lock()
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defer w.rlock.Unlock()
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return w.conn.ReadJSON(v)
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}
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// Close wraps corresponding method on the websocket but is safe for concurrent calling
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func (w *connWrapper) Close() error {
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// The Close and WriteControl methods can be called concurrently with all other methods,
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// so the mutex is not used here
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return w.conn.Close()
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}
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// New returns a monitoring service ready for stats reporting.
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func New(node *node.Node, backend backend, engine consensus.Engine, url string) error {
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// Parse the netstats connection url
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re := regexp.MustCompile("([^:@]*)(:([^@]*))?@(.+)")
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parts := re.FindStringSubmatch(url)
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if len(parts) != 5 {
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return fmt.Errorf("invalid netstats url: \"%s\", should be nodename:secret@host:port", url)
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}
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ethstats := &Service{
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backend: backend,
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engine: engine,
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server: node.Server(),
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node: parts[1],
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pass: parts[3],
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host: parts[4],
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pongCh: make(chan struct{}),
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histCh: make(chan []uint64, 1),
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}
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node.RegisterLifecycle(ethstats)
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return nil
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}
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// Start implements node.Lifecycle, starting up the monitoring and reporting daemon.
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func (s *Service) Start() error {
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go s.loop()
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log.Info("Stats daemon started")
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return nil
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}
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// Stop implements node.Lifecycle, terminating the monitoring and reporting daemon.
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func (s *Service) Stop() error {
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log.Info("Stats daemon stopped")
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return nil
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}
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// loop keeps trying to connect to the netstats server, reporting chain events
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// until termination.
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func (s *Service) loop() {
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// Subscribe to chain events to execute updates on
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chainHeadCh := make(chan core.ChainHeadEvent, chainHeadChanSize)
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headSub := s.backend.SubscribeChainHeadEvent(chainHeadCh)
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defer headSub.Unsubscribe()
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txEventCh := make(chan core.NewTxsEvent, txChanSize)
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txSub := s.backend.SubscribeNewTxsEvent(txEventCh)
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defer txSub.Unsubscribe()
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// Start a goroutine that exhausts the subscriptions to avoid events piling up
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var (
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quitCh = make(chan struct{})
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headCh = make(chan *types.Block, 1)
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txCh = make(chan struct{}, 1)
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)
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go func() {
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var lastTx mclock.AbsTime
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HandleLoop:
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for {
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select {
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// Notify of chain head events, but drop if too frequent
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case head := <-chainHeadCh:
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select {
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case headCh <- head.Block:
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default:
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}
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// Notify of new transaction events, but drop if too frequent
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case <-txEventCh:
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if time.Duration(mclock.Now()-lastTx) < time.Second {
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continue
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}
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lastTx = mclock.Now()
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select {
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case txCh <- struct{}{}:
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default:
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}
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// node stopped
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case <-txSub.Err():
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break HandleLoop
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case <-headSub.Err():
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break HandleLoop
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}
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}
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close(quitCh)
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}()
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// Resolve the URL, defaulting to TLS, but falling back to none too
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path := fmt.Sprintf("%s/api", s.host)
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urls := []string{path}
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// url.Parse and url.IsAbs is unsuitable (https://github.com/golang/go/issues/19779)
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if !strings.Contains(path, "://") {
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urls = []string{"wss://" + path, "ws://" + path}
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}
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errTimer := time.NewTimer(0)
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defer errTimer.Stop()
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// Loop reporting until termination
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for {
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select {
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case <-quitCh:
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return
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case <-errTimer.C:
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// Establish a websocket connection to the server on any supported URL
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var (
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conn *connWrapper
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err error
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)
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dialer := websocket.Dialer{HandshakeTimeout: 5 * time.Second}
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header := make(http.Header)
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header.Set("origin", "http://localhost")
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for _, url := range urls {
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c, _, e := dialer.Dial(url, header)
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err = e
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if err == nil {
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conn = newConnectionWrapper(c)
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break
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}
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}
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if err != nil {
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log.Warn("Stats server unreachable", "err", err)
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errTimer.Reset(10 * time.Second)
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continue
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}
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// Authenticate the client with the server
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if err = s.login(conn); err != nil {
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log.Warn("Stats login failed", "err", err)
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conn.Close()
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errTimer.Reset(10 * time.Second)
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continue
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}
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go s.readLoop(conn)
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// Send the initial stats so our node looks decent from the get go
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if err = s.report(conn); err != nil {
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log.Warn("Initial stats report failed", "err", err)
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conn.Close()
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errTimer.Reset(0)
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continue
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}
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// Keep sending status updates until the connection breaks
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fullReport := time.NewTicker(15 * time.Second)
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for err == nil {
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select {
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case <-quitCh:
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fullReport.Stop()
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// Make sure the connection is closed
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conn.Close()
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return
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case <-fullReport.C:
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if err = s.report(conn); err != nil {
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log.Warn("Full stats report failed", "err", err)
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}
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case list := <-s.histCh:
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if err = s.reportHistory(conn, list); err != nil {
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log.Warn("Requested history report failed", "err", err)
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}
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case head := <-headCh:
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if err = s.reportBlock(conn, head); err != nil {
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log.Warn("Block stats report failed", "err", err)
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}
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if err = s.reportPending(conn); err != nil {
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log.Warn("Post-block transaction stats report failed", "err", err)
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}
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case <-txCh:
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if err = s.reportPending(conn); err != nil {
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log.Warn("Transaction stats report failed", "err", err)
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}
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}
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}
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fullReport.Stop()
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// Close the current connection and establish a new one
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conn.Close()
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errTimer.Reset(0)
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}
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}
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}
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// readLoop loops as long as the connection is alive and retrieves data packets
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// from the network socket. If any of them match an active request, it forwards
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// it, if they themselves are requests it initiates a reply, and lastly it drops
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// unknown packets.
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func (s *Service) readLoop(conn *connWrapper) {
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// If the read loop exists, close the connection
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defer conn.Close()
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for {
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// Retrieve the next generic network packet and bail out on error
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var blob json.RawMessage
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if err := conn.ReadJSON(&blob); err != nil {
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log.Warn("Failed to retrieve stats server message", "err", err)
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return
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}
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// If the network packet is a system ping, respond to it directly
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var ping string
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if err := json.Unmarshal(blob, &ping); err == nil && strings.HasPrefix(ping, "primus::ping::") {
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if err := conn.WriteJSON(strings.Replace(ping, "ping", "pong", -1)); err != nil {
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log.Warn("Failed to respond to system ping message", "err", err)
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return
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}
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continue
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}
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// Not a system ping, try to decode an actual state message
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var msg map[string][]interface{}
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if err := json.Unmarshal(blob, &msg); err != nil {
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log.Warn("Failed to decode stats server message", "err", err)
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return
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}
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log.Trace("Received message from stats server", "msg", msg)
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if len(msg["emit"]) == 0 {
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log.Warn("Stats server sent non-broadcast", "msg", msg)
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return
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}
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command, ok := msg["emit"][0].(string)
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if !ok {
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log.Warn("Invalid stats server message type", "type", msg["emit"][0])
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return
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}
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// If the message is a ping reply, deliver (someone must be listening!)
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if len(msg["emit"]) == 2 && command == "node-pong" {
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select {
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case s.pongCh <- struct{}{}:
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// Pong delivered, continue listening
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continue
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default:
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// Ping routine dead, abort
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log.Warn("Stats server pinger seems to have died")
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return
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}
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}
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// If the message is a history request, forward to the event processor
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if len(msg["emit"]) == 2 && command == "history" {
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// Make sure the request is valid and doesn't crash us
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request, ok := msg["emit"][1].(map[string]interface{})
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if !ok {
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log.Warn("Invalid stats history request", "msg", msg["emit"][1])
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select {
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case s.histCh <- nil: // Treat it as an no indexes request
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default:
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}
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continue
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}
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list, ok := request["list"].([]interface{})
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if !ok {
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log.Warn("Invalid stats history block list", "list", request["list"])
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return
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}
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// Convert the block number list to an integer list
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numbers := make([]uint64, len(list))
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for i, num := range list {
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n, ok := num.(float64)
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if !ok {
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log.Warn("Invalid stats history block number", "number", num)
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return
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}
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numbers[i] = uint64(n)
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}
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select {
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case s.histCh <- numbers:
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continue
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default:
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}
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}
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// Report anything else and continue
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log.Info("Unknown stats message", "msg", msg)
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}
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}
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// nodeInfo is the collection of meta information about a node that is displayed
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// on the monitoring page.
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type nodeInfo struct {
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Name string `json:"name"`
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Node string `json:"node"`
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Port int `json:"port"`
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Network string `json:"net"`
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Protocol string `json:"protocol"`
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API string `json:"api"`
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Os string `json:"os"`
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OsVer string `json:"os_v"`
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Client string `json:"client"`
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History bool `json:"canUpdateHistory"`
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}
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// authMsg is the authentication infos needed to login to a monitoring server.
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type authMsg struct {
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ID string `json:"id"`
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Info nodeInfo `json:"info"`
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Secret string `json:"secret"`
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}
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// login tries to authorize the client at the remote server.
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func (s *Service) login(conn *connWrapper) error {
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// Construct and send the login authentication
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infos := s.server.NodeInfo()
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var protocols []string
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for _, proto := range s.server.Protocols {
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protocols = append(protocols, fmt.Sprintf("%s/%d", proto.Name, proto.Version))
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}
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var network string
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if info := infos.Protocols["eth"]; info != nil {
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network = fmt.Sprintf("%d", info.(*ethproto.NodeInfo).Network)
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}
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auth := &authMsg{
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ID: s.node,
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Info: nodeInfo{
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Name: s.node,
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Node: infos.Name,
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Port: infos.Ports.Listener,
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Network: network,
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Protocol: strings.Join(protocols, ", "),
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API: "No",
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Os: runtime.GOOS,
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OsVer: runtime.GOARCH,
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Client: "0.1.1",
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History: true,
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},
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Secret: s.pass,
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}
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login := map[string][]interface{}{
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"emit": {"hello", auth},
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}
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if err := conn.WriteJSON(login); err != nil {
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return err
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}
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// Retrieve the remote ack or connection termination
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var ack map[string][]string
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if err := conn.ReadJSON(&ack); err != nil || len(ack["emit"]) != 1 || ack["emit"][0] != "ready" {
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return errors.New("unauthorized")
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}
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return nil
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}
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// report collects all possible data to report and send it to the stats server.
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// This should only be used on reconnects or rarely to avoid overloading the
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// server. Use the individual methods for reporting subscribed events.
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func (s *Service) report(conn *connWrapper) error {
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if err := s.reportLatency(conn); err != nil {
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return err
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}
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if err := s.reportBlock(conn, nil); err != nil {
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return err
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}
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if err := s.reportPending(conn); err != nil {
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return err
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}
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if err := s.reportStats(conn); err != nil {
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return err
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}
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return nil
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}
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// reportLatency sends a ping request to the server, measures the RTT time and
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// finally sends a latency update.
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func (s *Service) reportLatency(conn *connWrapper) error {
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// Send the current time to the ethstats server
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start := time.Now()
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ping := map[string][]interface{}{
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"emit": {"node-ping", map[string]string{
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"id": s.node,
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"clientTime": start.String(),
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}},
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}
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if err := conn.WriteJSON(ping); err != nil {
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return err
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}
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// Wait for the pong request to arrive back
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select {
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case <-s.pongCh:
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// Pong delivered, report the latency
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case <-time.After(5 * time.Second):
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// Ping timeout, abort
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return errors.New("ping timed out")
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}
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latency := strconv.Itoa(int((time.Since(start) / time.Duration(2)).Nanoseconds() / 1000000))
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|
|
// 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 *connWrapper, 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
|
|
)
|
|
|
|
// check if backend is a full node
|
|
fullBackend, ok := s.backend.(fullNodeBackend)
|
|
if ok {
|
|
if block == nil {
|
|
block = fullBackend.CurrentBlock()
|
|
}
|
|
header = block.Header()
|
|
td = fullBackend.GetTd(context.Background(), header.Hash())
|
|
|
|
txs = make([]txStats, len(block.Transactions()))
|
|
for i, tx := range block.Transactions() {
|
|
txs[i].Hash = tx.Hash()
|
|
}
|
|
uncles = block.Uncles()
|
|
}
|
|
|
|
// 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 *connWrapper, 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
|
|
head := s.backend.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 {
|
|
fullBackend, ok := s.backend.(fullNodeBackend)
|
|
// Retrieve the next block if it's known to us
|
|
var block *types.Block
|
|
if ok {
|
|
block, _ = fullBackend.BlockByNumber(context.Background(), rpc.BlockNumber(number)) // TODO ignore error here ?
|
|
} else {
|
|
if header, _ := s.backend.HeaderByNumber(context.Background(), rpc.BlockNumber(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 *connWrapper) error {
|
|
// Retrieve the pending count from the local blockchain
|
|
pending, _ := s.backend.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"`
|
|
GoodPeers int `json:"peers"`
|
|
GasPrice int `json:"gasPrice"`
|
|
Uptime int `json:"uptime"`
|
|
}
|
|
|
|
// reportStats retrieves various stats about the node at the networking and
|
|
// mining layer and reports it to the stats server.
|
|
func (s *Service) reportStats(conn *connWrapper) error {
|
|
// Gather the syncing and mining infos from the local miner instance
|
|
var (
|
|
mining bool
|
|
hashrate int
|
|
syncing bool
|
|
gasprice int
|
|
)
|
|
// check if backend is a full node
|
|
fullBackend, ok := s.backend.(fullNodeBackend)
|
|
if ok {
|
|
mining = fullBackend.Miner().Mining()
|
|
hashrate = int(fullBackend.Miner().HashRate())
|
|
|
|
sync := fullBackend.Downloader().Progress()
|
|
syncing = fullBackend.CurrentHeader().Number.Uint64() >= sync.HighestBlock
|
|
|
|
price, _ := fullBackend.SuggestPrice(context.Background())
|
|
gasprice = int(price.Uint64())
|
|
}
|
|
// 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,
|
|
GoodPeers: s.server.PeerCount(),
|
|
GasPrice: gasprice,
|
|
Syncing: syncing,
|
|
Uptime: 100,
|
|
},
|
|
}
|
|
report := map[string][]interface{}{
|
|
"emit": {"stats", stats},
|
|
}
|
|
return conn.WriteJSON(report)
|
|
}
|
|
*/
|