91 lines
2.2 KiB
Go
91 lines
2.2 KiB
Go
package operationlock_test
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import (
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"context"
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"os"
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"path/filepath"
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"testing"
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"time"
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"proxyctl/internal/operationlock"
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)
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type recordingLocker struct {
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name string
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events *[]string
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err error
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}
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func (l recordingLocker) Lock(context.Context) (func(), error) {
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*l.events = append(*l.events, "lock "+l.name)
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if l.err != nil {
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return nil, l.err
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}
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return func() { *l.events = append(*l.events, "unlock "+l.name) }, nil
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}
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func TestGroupAcquiresInOrderAndReleasesInReverse(t *testing.T) {
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var events []string
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group := operationlock.NewGroup(
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recordingLocker{name: "system", events: &events},
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recordingLocker{name: "user", events: &events},
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)
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unlock, err := group.Lock(context.Background())
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if err != nil {
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t.Fatal(err)
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}
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unlock()
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want := []string{"lock system", "lock user", "unlock user", "unlock system"}
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if len(events) != len(want) {
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t.Fatalf("events = %v, want %v", events, want)
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}
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for i := range want {
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if events[i] != want[i] {
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t.Fatalf("events = %v, want %v", events, want)
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}
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}
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}
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func TestLockRejectsSymlinkedStateAncestor(t *testing.T) {
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root := t.TempDir()
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victim := filepath.Join(root, "victim")
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if err := os.Mkdir(victim, 0o700); err != nil {
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t.Fatal(err)
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}
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if err := os.Symlink(victim, filepath.Join(root, "state")); err != nil {
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t.Fatal(err)
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}
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lock := operationlock.New(filepath.Join(root, "state", "proxyctl", "operation.lock"))
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if _, err := lock.Lock(context.Background()); err == nil {
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t.Fatal("lock followed a symlinked state ancestor")
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}
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entries, err := os.ReadDir(victim)
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if err != nil {
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t.Fatal(err)
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}
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if len(entries) != 0 {
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t.Fatalf("victim changed: %v", entries)
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}
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}
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func TestLockSerializesIndependentInstancesAndHonorsContext(t *testing.T) {
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path := t.TempDir() + "/proxyctl.lock"
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first := operationlock.New(path)
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second := operationlock.New(path)
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unlock, err := first.Lock(context.Background())
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if err != nil {
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t.Fatal(err)
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}
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ctx, cancel := context.WithTimeout(context.Background(), 30*time.Millisecond)
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defer cancel()
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if _, err := second.Lock(ctx); err == nil {
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t.Fatal("second lock acquired while first held")
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}
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unlock()
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unlockSecond, err := second.Lock(context.Background())
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if err != nil {
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t.Fatal(err)
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}
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unlockSecond()
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}
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