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buffered_writer_test.go
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buffered_writer_test.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http:https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package fileexporter
import (
"bytes"
"fmt"
"io"
"os"
"path"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"go.uber.org/multierr"
)
const (
msg = "it is a beautiful world"
SizeByte = 1
SizeKiloByte = 1 << (10 * iota)
SizeMegaByte
)
type NopWriteCloser struct {
w io.Writer
}
func (NopWriteCloser) Close() error { return nil }
func (wc *NopWriteCloser) Write(p []byte) (int, error) { return wc.w.Write(p) }
func TestBufferedWrites(t *testing.T) {
t.Parallel()
b := bytes.NewBuffer(nil)
w := newBufferedWriteCloser(&NopWriteCloser{b})
_, err := w.Write([]byte(msg))
require.NoError(t, err, "Must not error when writing data")
assert.NoError(t, w.Close(), "Must not error when closing writer")
assert.Equal(t, msg, b.String(), "Must match the expected string")
}
var (
benchmarkErr error
)
func BenchmarkWriter(b *testing.B) {
tempfile := func(tb testing.TB) io.WriteCloser {
f, err := os.CreateTemp(tb.TempDir(), tb.Name())
require.NoError(tb, err, "Must not error when creating benchmark temp file")
tb.Cleanup(func() {
assert.NoError(tb, os.RemoveAll(path.Dir(f.Name())), "Must clean up files after being written")
})
return f
}
for _, payloadSize := range []int{
10 * SizeKiloByte,
100 * SizeKiloByte,
SizeMegaByte,
10 * SizeMegaByte,
} {
payload := make([]byte, payloadSize)
for i := 0; i < payloadSize; i++ {
payload[i] = 'a'
}
for name, w := range map[string]io.WriteCloser{
"discard": &NopWriteCloser{io.Discard},
"buffered-discard": newBufferedWriteCloser(&NopWriteCloser{io.Discard}),
"raw-file": tempfile(b),
"buffered-file": newBufferedWriteCloser(tempfile(b)),
} {
w := w
b.Run(fmt.Sprintf("%s_%d_bytes", name, payloadSize), func(b *testing.B) {
b.ReportAllocs()
b.ResetTimer()
var err error
for i := 0; i < b.N; i++ {
_, err = w.Write(payload)
}
benchmarkErr = multierr.Combine(err, w.Close())
})
}
}
}