prometheus/util/flock/flock_test.go

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package flock
import (
"os"
"path/filepath"
"testing"
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"github.com/prometheus/prometheus/util/testutil"
)
func TestLocking(t *testing.T) {
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dir := testutil.NewTemporaryDirectory("test_flock", t)
defer dir.Close()
fileName := filepath.Join(dir.Path(), "LOCK")
if _, err := os.Stat(fileName); err == nil {
t.Fatalf("File %q unexpectedly exists.", fileName)
}
lock, existed, err := New(fileName)
if err != nil {
t.Fatalf("Error locking file %q: %s", fileName, err)
}
if existed {
t.Errorf("File %q reported as existing during locking.", fileName)
}
// File must now exist.
if _, err := os.Stat(fileName); err != nil {
t.Errorf("Could not stat file %q expected to exist: %s", fileName, err)
}
// Try to lock again.
lockedAgain, existed, err := New(fileName)
if err == nil {
t.Fatalf("File %q locked twice.", fileName)
}
if lockedAgain != nil {
t.Error("Unsuccessful locking did not return nil.")
}
if !existed {
t.Errorf("Existing file %q not recognized.", fileName)
}
if err := lock.Release(); err != nil {
t.Errorf("Error releasing lock for file %q: %s", fileName, err)
}
// File must still exist.
if _, err := os.Stat(fileName); err != nil {
t.Errorf("Could not stat file %q expected to exist: %s", fileName, err)
}
// Lock existing file.
lock, existed, err = New(fileName)
if err != nil {
t.Fatalf("Error locking file %q: %s", fileName, err)
}
if !existed {
t.Errorf("Existing file %q not recognized.", fileName)
}
if err := lock.Release(); err != nil {
t.Errorf("Error releasing lock for file %q: %s", fileName, err)
}
}