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package main
import (
"context"
"crypto/rand"
"errors"
"fmt"
"math"
"time"
rpchttp "github.com/tendermint/tendermint/rpc/client/http"
e2e "github.com/tendermint/tendermint/test/e2e/pkg"
"github.com/tendermint/tendermint/types"
)
// Load generates transactions against the network until the given
// context is canceled.
func Load(ctx context.Context, testnet *e2e.Testnet) error {
// Since transactions are executed across all nodes in the network, we need
// to reduce transaction load for larger networks to avoid using too much
// CPU. This gives high-throughput small networks and low-throughput large ones.
// This also limits the number of TCP connections, since each worker has
// a connection to all nodes.
concurrency := 64 / len(testnet.Nodes)
if concurrency == 0 {
concurrency = 1
}
initialTimeout := 1 * time.Minute
stallTimeout := 30 * time.Second
chTx := make(chan types.Tx)
chSuccess := make(chan types.Tx)
ctx, cancel := context.WithCancel(ctx)
defer cancel()
// Spawn job generator and processors.
logger.Info(fmt.Sprintf("Starting transaction load (%v workers)...", concurrency))
started := time.Now()
go loadGenerate(ctx, chTx)
for w := 0; w < concurrency; w++ {
go loadProcess(ctx, testnet, chTx, chSuccess)
}
// Monitor successful transactions, and abort on stalls.
success := 0
timeout := initialTimeout
for {
select {
case <-chSuccess:
success++
timeout = stallTimeout
case <-time.After(timeout):
return fmt.Errorf("unable to submit transactions for %v", timeout)
case <-ctx.Done():
if success == 0 {
return errors.New("failed to submit any transactions")
}
logger.Info(fmt.Sprintf("Ending transaction load after %v txs (%.1f tx/s)...",
success, float64(success)/time.Since(started).Seconds()))
return nil
}
}
}
// loadGenerate generates jobs until the context is canceled
func loadGenerate(ctx context.Context, chTx chan<- types.Tx) {
for i := 0; i < math.MaxInt64; i++ {
// We keep generating the same 1000 keys over and over, with different values.
// This gives a reasonable load without putting too much data in the app.
id := i % 1000
bz := make([]byte, 2048) // 4kb hex-encoded
_, err := rand.Read(bz)
if err != nil {
panic(fmt.Sprintf("Failed to read random bytes: %v", err))
}
tx := types.Tx(fmt.Sprintf("load-%X=%x", id, bz))
select {
case chTx <- tx:
time.Sleep(10 * time.Millisecond)
case <-ctx.Done():
close(chTx)
return
}
}
}
// loadProcess processes transactions
func loadProcess(ctx context.Context, testnet *e2e.Testnet, chTx <-chan types.Tx, chSuccess chan<- types.Tx) {
// Each worker gets its own client to each node, which allows for some
// concurrency while still bounding it.
clients := map[string]*rpchttp.HTTP{}
var err error
for tx := range chTx {
node := testnet.RandomNode()
client, ok := clients[node.Name]
if !ok {
client, err = node.Client()
if err != nil {
continue
}
clients[node.Name] = client
}
_, err = client.BroadcastTxCommit(ctx, tx)
if err != nil {
continue
}
chSuccess <- tx
}
}