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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package network
import (
"bytes"
"fmt"
"io"
"testing"
"github.com/stretchr/testify/require"
"github.com/algorand/go-algorand/crypto"
"github.com/algorand/go-algorand/test/partitiontest"
)
func TestLimitedReaderSlurper(t *testing.T) {
partitiontest.PartitionTest(t)
for _, arraySize := range []uint64{30000, 90000, 200000} {
// create a random bytes array.
bytesBlob := make([]byte, arraySize)
crypto.RandBytes(bytesBlob[:])
for baseBufferSize := uint64(0); baseBufferSize < uint64(len(bytesBlob)); baseBufferSize += 731 {
for _, maxSize := range []uint64{arraySize - 10000, arraySize, arraySize + 10000} {
buffer := bytes.NewBuffer(bytesBlob)
reader := MakeLimitedReaderSlurper(baseBufferSize, maxSize)
err := reader.Read(buffer)
if maxSize < uint64(len(bytesBlob)) {
require.Equal(t, ErrIncomingMsgTooLarge, err)
continue
}
require.NoError(t, err)
bytes := reader.Bytes()
require.Equal(t, bytesBlob, bytes)
}
}
}
}
type fuzzReader struct {
pos int
buf []byte
}
func (f *fuzzReader) Read(b []byte) (n int, err error) {
s := int(crypto.RandUint64() % 19)
if s > len(b) {
s = len(b)
}
if f.pos >= len(f.buf) {
return 0, io.EOF
}
if f.pos+s >= len(f.buf) {
// we want a chunk that ends at ( or after ) the end of the data.
n = len(f.buf) - f.pos
err = io.EOF
} else {
n = s
}
copy(b, f.buf[f.pos:f.pos+n])
f.pos += n
return
}
func TestLimitedReaderSlurper_FuzzedBlippedSource(t *testing.T) {
partitiontest.PartitionTest(t)
arraySize := uint64(300000)
bytesBlob := make([]byte, arraySize)
crypto.RandBytes(bytesBlob[:])
for i := 0; i < 500; i++ {
for _, maxSize := range []uint64{arraySize - 10000, arraySize, arraySize + 10000} {
reader := MakeLimitedReaderSlurper(512, maxSize)
err := reader.Read(&fuzzReader{buf: bytesBlob})
if maxSize < uint64(len(bytesBlob)) {
require.Equal(t, ErrIncomingMsgTooLarge, err, "i: %d\nmaxSize: %d", i, maxSize)
continue
}
require.NoError(t, err)
bytes := reader.Bytes()
require.Equal(t, bytesBlob, bytes)
}
}
}
func benchmarkLimitedReaderSlurper(b *testing.B, arraySize uint64) {
bytesBlob := make([]byte, arraySize)
crypto.RandBytes(bytesBlob[:])
readers := make([]*LimitedReaderSlurper, b.N)
buffers := make([]*bytes.Buffer, b.N)
for i := 0; i < b.N; i++ {
buffers[i] = bytes.NewBuffer(bytesBlob)
readers[i] = MakeLimitedReaderSlurper(1024, 1024*1024)
}
b.ResetTimer()
for i := 0; i < b.N; i++ {
reader := readers[i]
err := reader.Read(buffers[i])
require.NoError(b, err)
reader.Bytes()
reader.Reset(0)
}
}
func BenchmarkLimitedReaderSlurper(b *testing.B) {
for _, arraySize := range []uint64{200, 2048, 300000} {
b.Run(fmt.Sprintf("%dbytes_message", arraySize), func(b *testing.B) {
benchmarkLimitedReaderSlurper(b, arraySize)
})
}
}
func TestLimitedReaderSlurperMemoryConsumption(t *testing.T) {
partitiontest.PartitionTest(t)
for _, arraySize := range []uint64{1024, 2048, 65536, 1024 * 1024} {
result := testing.Benchmark(func(b *testing.B) {
benchmarkLimitedReaderSlurper(b, arraySize)
})
require.True(t, uint64(result.AllocedBytesPerOp()) < 2*arraySize+allocationStep, "AllocedBytesPerOp:%d\nmessage size:%d", result.AllocedBytesPerOp(), arraySize)
}
}
func TestLimitedReaderSlurperBufferAllocations(t *testing.T) {
partitiontest.PartitionTest(t)
for baseAllocation := uint64(512); baseAllocation < 100000; baseAllocation += 2048 {
for maxAllocation := uint64(512); maxAllocation < 100000; maxAllocation += 512 {
lrs := MakeLimitedReaderSlurper(baseAllocation, maxAllocation)
// check to see if the allocated buffers count is exactly what needed to match the allocation needs.
allocationNeeds := 1
remainingBytes := int64(maxAllocation - baseAllocation)
for remainingBytes > 0 {
allocationNeeds++
remainingBytes -= int64(allocationStep)
}
require.Equal(t, allocationNeeds, len(lrs.buffers))
}
}
}
func TestLimitedReaderSlurperPerMessageMaxSize(t *testing.T) {
partitiontest.PartitionTest(t)
t.Parallel()
type randMode int
const (
modeLessThan randMode = iota
modeEqual
modeGreaterThan
)
maxMessageSize := 1024
slurper := MakeLimitedReaderSlurper(512, uint64(maxMessageSize))
for i := 0; i < 30; i++ {
var b []byte
randPick := randMode(crypto.RandUint64() % uint64(3))
currentSize := crypto.RandUint64()%uint64(maxMessageSize) + 1
slurper.Reset(currentSize)
if randPick == modeLessThan {
dataSize := crypto.RandUint64() % currentSize
b = make([]byte, dataSize)
crypto.RandBytes(b[:])
err := slurper.Read(bytes.NewBuffer(b))
require.NoError(t, err)
require.Len(t, slurper.Bytes(), int(dataSize))
} else if randPick == modeEqual {
dataSize := currentSize
b = make([]byte, dataSize)
crypto.RandBytes(b[:])
err := slurper.Read(bytes.NewBuffer(b))
require.NoError(t, err)
require.Len(t, slurper.Bytes(), int(currentSize))
} else if randPick == modeGreaterThan {
dataSize := currentSize + 1
b = make([]byte, dataSize)
crypto.RandBytes(b[:])
err := slurper.Read(bytes.NewBuffer(b))
require.Error(t, err)
}
}
}
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