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package loglevel
import (
"io"
"os"
"path/filepath"
"strings"
"sync"
"testing"
)
func createFileRotater(t *testing.T) (*FileRotater, func()) {
d, err := os.MkdirTemp("", "logtest")
if err != nil {
t.Fatalf("failed creating tmp dir: %v", err)
}
fn := filepath.Join(d, "test.log")
fr, err := NewFileRotater(fn)
if err != nil {
t.Fatalf("NewFileRotater error: %v", err)
}
if fr == nil {
t.Fatal("NewFileRotater returned nil")
}
return fr, func() {
err := os.RemoveAll(d)
if err != nil {
t.Errorf("failed removing file: %v", err)
}
}
}
func TestNewFileRotater(t *testing.T) {
_, cleanup := createFileRotater(t)
cleanup()
d, err := os.MkdirTemp("", "anotherlogtest")
if err != nil {
t.Fatalf("failed creating another tmp dir: %v", err)
}
nef := filepath.Join(d, "notexist", "test.log")
_, err = NewFileRotater(nef)
if err == nil {
t.Error("NewFileRotater returned no error with nonexistent dir")
}
}
func TestWriteConcurrent(t *testing.T) {
fr, cleanup := createFileRotater(t)
defer cleanup()
MaxSize = 5
var wg sync.WaitGroup
for range 5 {
wg.Add(1)
go func() {
_, err := fr.Write([]byte("test"))
defer wg.Done()
if err != nil {
t.Errorf("concurrent write returned an error: %v", err)
}
}()
}
wg.Wait()
}
func TestWriteTrim(t *testing.T) {
fr, cleanup := createFileRotater(t)
defer cleanup()
writeNCheckSize := func(n int, size int64) {
buf := make([]byte, n)
for i := range n {
buf[i] = 'x'
}
_, err := fr.Write(buf)
if err != nil {
t.Fatalf("failed writing: %v", err)
}
fs, err := fr.file.Stat()
if err != nil {
t.Fatalf("failed getting size: %v", err)
}
gsize := fs.Size()
if gsize != size {
t.Fatalf("got: %v, want: %v, max size: %v", gsize, size, MaxSize)
}
}
// we test by writing a start message and checking if it disappears after trimmign
// the max size we set to the length of the start message + 20 bytes
begS := "this is the start"
begB := []byte(begS)
startN := int64(len(begB))
MaxSize = startN + 20
TrimSize = MaxSize / 2
// no trim yet
_, err := fr.Write(begB)
if err != nil {
t.Fatalf("failed writing start message: %v", err)
}
// write until the trimming size
writeNCheckSize(5, startN+5)
writeNCheckSize(15, MaxSize)
// set the length we want to write
var n int64 = 11
// now the size should be the length of the trimmed message plus the remaining (non-trimmed part of the file) plus the length we want to write
size := int64(len(TrimMsg)) + (MaxSize - TrimSize) + n
writeNCheckSize(11, size)
// disable trimming by setting it to a high value
MaxSize = 9000
TrimSize = 9000
// now the size should be the old size plus the write size
newN := 12
writeNCheckSize(newN, size+int64(newN))
_, err = fr.file.Seek(0, io.SeekStart)
if err != nil {
t.Fatalf("failed going to beginning of file: %v", err)
}
b, err := io.ReadAll(fr.file)
if err != nil {
t.Fatalf("failed reading file: %v", err)
}
corpus := string(b)
if strings.Contains(corpus, begS) {
t.Fatalf("file still contains beginning message: %v", corpus)
}
if !strings.Contains(corpus, TrimMsg) {
t.Fatalf("file does not contain trim message: %v", corpus)
}
}
|
