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filecache_test.go
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filecache_test.go
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package filecache
import (
"bytes"
"crypto/rand"
"io"
"os"
"testing"
)
func TestFileCache(t *testing.T) {
tmpDir, err := os.MkdirTemp("", "tmplreload")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(tmpDir)
file1, err := os.CreateTemp(tmpDir, "file1")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file1.Name())
file2, err := os.CreateTemp(tmpDir, "file2")
if err != nil {
t.Fatal(err)
}
defer os.Remove(file2.Name())
_, err = file1.Write(make([]uint8, 1024*1024))
if err != nil {
t.Fatal(err)
}
_, err = file2.Write(make([]uint8, 3*1024*1024))
if err != nil {
t.Fatal(err)
}
f := NewFileCache(2 * 1024 * 1024)
err = f.Update(file1.Name())
if err != nil {
t.Fatal(err)
}
err = f.Update(file2.Name())
if err != nil {
t.Fatal(err)
}
r, w, err := f.Get(file1.Name())
if err != nil {
t.Fatal(err)
}
if w != nil {
t.Fatalf("expected no writer, got %v", w)
}
buf := make([]uint8, 1024*1024)
n, err := r.Read(buf)
if err != nil {
t.Fatal(err)
}
if n != 1024*1024 {
t.Fatalf("expected to read 1MB, read %d bytes", n)
}
r, w, err = f.Get(file2.Name())
if err != nil {
t.Fatal(err)
}
if w == nil {
t.Fatalf("expected a writer, got nil")
}
defer w.Close()
buf = make([]uint8, 3*1024*1024)
n, err = rand.Read(buf)
if err != nil {
t.Fatal(err)
}
if n != 3*1024*1024 {
t.Fatalf("expected to read 3MB, read %d bytes", n)
}
buf2 := make([]uint8, 3*1024*1024)
n, err = rand.Read(buf2)
if err != nil {
t.Fatal(err)
}
written, err := io.Copy(io.MultiWriter(bytes.NewBuffer(buf[:0]), bytes.NewBuffer(buf2[:0])), r)
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(buf, buf2) {
t.Fatalf("expected to read the same data twice, got different data")
}
if written != 3*1024*1024 {
t.Fatalf("expected to read 3MB, read %d bytes", n)
}
}