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package build
import (
"bytes"
"crypto/rand"
"io"
mathrand "math/rand"
"sync"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
func generateRandomData(size int) []byte {
data := make([]byte, size)
rand.Read(data)
return data
}
func TestSyncMultiReaderParallel(t *testing.T) {
data := generateRandomData(1024 * 1024)
source := bytes.NewReader(data)
mr := NewSyncMultiReader(source)
var wg sync.WaitGroup
numReaders := 10
bufferSize := 4096 * 4
readers := make([]io.ReadCloser, numReaders)
for i := 0; i < numReaders; i++ {
readers[i] = mr.NewReadCloser()
}
for i := 0; i < numReaders; i++ {
wg.Add(1)
go func(readerId int) {
defer wg.Done()
reader := readers[readerId]
defer reader.Close()
totalRead := 0
buf := make([]byte, bufferSize)
for totalRead < len(data) {
// Simulate random read sizes
readSize := mathrand.Intn(bufferSize) //nolint:gosec
n, err := reader.Read(buf[:readSize])
if n > 0 {
assert.Equal(t, data[totalRead:totalRead+n], buf[:n], "Reader %d mismatch", readerId)
totalRead += n
}
if err == io.EOF {
assert.Equal(t, len(data), totalRead, "Reader %d EOF mismatch", readerId)
return
}
assert.NoError(t, err, "Reader %d error", readerId)
if mathrand.Intn(1000) == 0 { //nolint:gosec
t.Logf("Reader %d closing", readerId)
// Simulate random close
return
}
// Simulate random timing between reads
time.Sleep(time.Millisecond * time.Duration(mathrand.Intn(5))) //nolint:gosec
}
assert.Equal(t, len(data), totalRead, "Reader %d total read mismatch", readerId)
}(i)
}
wg.Wait()
}
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