// Copyright 2017 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package bloombits
import (
"bytes"
"math/big"
"math/rand"
"sync"
"sync/atomic"
"testing"
"time"
)
// Tests that the scheduler can deduplicate and forward retrieval requests to
// underlying fetchers and serve responses back, irrelevant of the concurrency
// of the requesting clients or serving data fetchers.
func TestSchedulerSingleClientSingleFetcher(t *testing.T) { testScheduler(t, 1, 1, 5000) }
func TestSchedulerSingleClientMultiFetcher(t *testing.T) { testScheduler(t, 1, 10, 5000) }
func TestSchedulerMultiClientSingleFetcher(t *testing.T) { testScheduler(t, 10, 1, 5000) }
func TestSchedulerMultiClientMultiFetcher(t *testing.T) { testScheduler(t, 10, 10, 5000) }
func testScheduler(t *testing.T, clients int, fetchers int, requests int) {
f := newScheduler(0)
// Create a batch of handler goroutines that respond to bloom bit requests and
// deliver them to the scheduler.
var fetchPend sync.WaitGroup
fetchPend.Add(fetchers)
defer fetchPend.Wait()
fetch := make(chan *request, 16)
defer close(fetch)
var delivered uint32
for i := 0; i < fetchers; i++ {
go func() {
defer fetchPend.Done()
for req := range fetch {
time.Sleep(time.Duration(rand.Intn(int(100 * time.Microsecond))))
atomic.AddUint32(&delivered, 1)
f.deliver([]uint64{
req.section + uint64(requests), // Non-requested data (ensure it doesn't go out of bounds)
req.section, // Requested data
req.section, // Duplicated data (ensure it doesn't double close anything)
}, [][]byte{
{},
new(big.Int).SetUint64(req.section).Bytes(),
new(big.Int).SetUint64(req.section).Bytes(),
})
}
}()
}
// Start a batch of goroutines to concurrently run scheduling tasks
quit := make(chan struct{})
var pend sync.WaitGroup
pend.Add(clients)
for i := 0; i < clients; i++ {
go func() {
defer pend.Done()
in := make(chan uint64, 16)
out := make(chan []byte, 16)
f.run(in, fetch, out, quit, &pend)
go func() {
for j := 0; j < requests; j++ {
in <- uint64(j)
}
close(in)
}()
for j := 0; j < requests; j++ {
bits := <-out
if want := new(big.Int).SetUint64(uint64(j)).Bytes(); !bytes.Equal(bits, want) {
t.Errorf("vector %d: delivered content mismatch: have %x, want %x", j, bits, want)
}
}
}()
}
pend.Wait()
if have := atomic.LoadUint32(&delivered); int(have) != requests {
t.Errorf("request count mismatch: have %v, want %v", have, requests)
}
}
