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181 lines
4.2 KiB
181 lines
4.2 KiB
package main
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import (
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"encoding/binary"
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"encoding/hex"
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"fmt"
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"math/rand"
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"net/http"
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"net/url"
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"os"
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"sync"
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"time"
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"github.com/go-kit/kit/log"
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"github.com/gorilla/websocket"
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"github.com/pkg/errors"
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rpctypes "github.com/tendermint/go-rpc/types"
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)
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const (
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sendTimeout = 500 * time.Millisecond
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// see https://github.com/tendermint/go-rpc/blob/develop/server/handlers.go#L313
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pingPeriod = (30 * 9 / 10) * time.Second
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)
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type transacter struct {
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Target string
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Rate int
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Connections int
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conns []*websocket.Conn
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wg sync.WaitGroup
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stopped bool
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logger log.Logger
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}
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func newTransacter(target string, connections int, rate int) *transacter {
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return &transacter{
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Target: target,
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Rate: rate,
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Connections: connections,
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conns: make([]*websocket.Conn, connections),
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logger: log.NewNopLogger(),
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}
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}
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// SetLogger lets you set your own logger
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func (t *transacter) SetLogger(l log.Logger) {
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t.logger = l
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}
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// Start opens N = `t.Connections` connections to the target and creates read
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// and write goroutines for each connection.
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func (t *transacter) Start() error {
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t.stopped = false
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for i := 0; i < t.Connections; i++ {
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c, _, err := connect(t.Target)
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if err != nil {
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return err
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}
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t.conns[i] = c
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}
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t.wg.Add(2 * t.Connections)
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for i := 0; i < t.Connections; i++ {
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go t.sendLoop(i)
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go t.receiveLoop(i)
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}
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return nil
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}
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// Stop closes the connections.
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func (t *transacter) Stop() {
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t.stopped = true
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t.wg.Wait()
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for _, c := range t.conns {
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c.Close()
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}
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}
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// receiveLoop reads messages from the connection (empty in case of
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// `broadcast_tx_async`).
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func (t *transacter) receiveLoop(connIndex int) {
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c := t.conns[connIndex]
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defer t.wg.Done()
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for {
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_, _, err := c.ReadMessage()
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if err != nil {
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if websocket.IsUnexpectedCloseError(err, websocket.CloseNormalClosure) {
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t.logger.Log("err", errors.Wrap(err, "failed to read response"))
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}
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return
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}
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if t.stopped {
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return
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}
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}
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}
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// sendLoop generates transactions at a given rate.
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func (t *transacter) sendLoop(connIndex int) {
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c := t.conns[connIndex]
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logger := log.With(t.logger, "addr", c.RemoteAddr())
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var txNumber = 0
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pingsTicker := time.NewTicker(pingPeriod)
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txsTicker := time.NewTicker(1 * time.Second)
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defer func() {
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pingsTicker.Stop()
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txsTicker.Stop()
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t.wg.Done()
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}()
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for {
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select {
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case <-txsTicker.C:
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startTime := time.Now()
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for i := 0; i < t.Rate; i++ {
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// each transaction embeds connection index and tx number
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tx := generateTx(connIndex, txNumber)
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c.SetWriteDeadline(time.Now().Add(sendTimeout))
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err := c.WriteJSON(rpctypes.RPCRequest{
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JSONRPC: "2.0",
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ID: "",
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Method: "broadcast_tx_async",
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Params: []interface{}{hex.EncodeToString(tx)},
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})
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if err != nil {
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fmt.Printf("%v. Try increasing the connections count and reducing the rate.\n", errors.Wrap(err, "txs send failed"))
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os.Exit(1)
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}
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txNumber++
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}
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timeToSend := time.Now().Sub(startTime)
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time.Sleep(time.Second - timeToSend)
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logger.Log("event", fmt.Sprintf("sent %d transactions", t.Rate), "took", timeToSend)
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case <-pingsTicker.C:
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// Right now go-rpc server closes the connection in the absence of pings
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c.SetWriteDeadline(time.Now().Add(sendTimeout))
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if err := c.WriteMessage(websocket.PingMessage, []byte{}); err != nil {
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logger.Log("err", errors.Wrap(err, "failed to write ping message"))
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}
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}
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if t.stopped {
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// To cleanly close a connection, a client should send a close
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// frame and wait for the server to close the connection.
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c.SetWriteDeadline(time.Now().Add(sendTimeout))
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err := c.WriteMessage(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""))
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if err != nil {
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logger.Log("err", errors.Wrap(err, "failed to write close message"))
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}
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return
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}
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}
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}
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func connect(host string) (*websocket.Conn, *http.Response, error) {
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u := url.URL{Scheme: "ws", Host: host, Path: "/websocket"}
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return websocket.DefaultDialer.Dial(u.String(), nil)
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}
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func generateTx(a int, b int) []byte {
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tx := make([]byte, 250)
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binary.PutUvarint(tx[:32], uint64(a))
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binary.PutUvarint(tx[32:64], uint64(b))
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if _, err := rand.Read(tx[234:]); err != nil {
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panic(errors.Wrap(err, "failed to generate transaction"))
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}
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return tx
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}
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