core, eth: clean up bloom filtering, add some tests

core/bloombits/scheduler_test.go

@@ -0,0 +1,105 @@
+// 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{
+					[]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)
+	}
+}