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Fixes to tm-bench transaction content

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- Initialize random with current time as seed so transaction messages are different at every run
- Added hash of hostname to make transactions coming from different hosts different in every case
- Added current time to transaction to make sure that messages are different even if random numbers are the same in subsequent runs
- Shortened the transaction size to 64 bytes from the original 250
This commit is contained in:
Greg Szabo
2017-08-23 10:57:14 -04:00
committed by Anton Kaliaev
parent cd5173f9a5
commit 45a7ae2e62
2 changed files with 37 additions and 8 deletions
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31
tm-bench/transacter.go
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@ -30,6 +30,7 @@ type transacter struct {
Target string
Rate int
Connections int
HostHash [16]byte
conns []*websocket.Conn
wg sync.WaitGroup
@ -38,11 +39,12 @@ type transacter struct {
logger log.Logger
}
func newTransacter(target string, connections int, rate int) *transacter {
func newTransacter(target string, connections int, rate int, hosthash [16]byte) *transacter {
return &transacter{
Target: target,
Rate: rate,
Connections: connections,
HostHash: hosthash,
conns: make([]*websocket.Conn, connections),
logger: log.NewNopLogger(),
}
@ -136,7 +138,7 @@ func (t *transacter) sendLoop(connIndex int) {
for i := 0; i < t.Rate; i++ {
// each transaction embeds connection index and tx number
tx := generateTx(connIndex, txNumber)
tx := generateTx(connIndex, txNumber, t.HostHash)
paramsJson, err := json.Marshal(map[string]interface{}{"tx": hex.EncodeToString(tx)})
if err != nil {
fmt.Printf("failed to encode params: %v\n", err)
@ -189,11 +191,26 @@ func connect(host string) (*websocket.Conn, *http.Response, error) {
return websocket.DefaultDialer.Dial(u.String(), nil)
}
func generateTx(a int, b int) []byte {
tx := make([]byte, 250)
binary.PutUvarint(tx[:32], uint64(a))
binary.PutUvarint(tx[32:64], uint64(b))
if _, err := rand.Read(tx[234:]); err != nil {
func generateTx(a int, b int, hosthash [16]byte) []byte {
// 64 byte transaction
tx := make([]byte, 64)
// 0-8 connection number
binary.PutUvarint(tx[:8], uint64(a))
// 8-16 transaction number
binary.PutUvarint(tx[8:16], uint64(b))
// 16-32 hostname hash
for i:=0; i < 16 ; i++ {
tx[16+i] = hosthash[i]
}
// 32-40 current time
PutUvarint(tx[32:40], uint64(time.Now().Unix()))
// 40-64 random data
if _, err := rand.Read(tx[40:]); err != nil {
panic(errors.Wrap(err, "failed to generate transaction"))
}
return tx