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// SPDX-License-Identifier: GPL-3.0-or-later
package kwcache
import (
"os"
"path/filepath"
"reflect"
"testing"
)
var (
a = ID{Dev: 1, Ino: 10, Size: 100, MTime: 1000}
b = ID{Dev: 1, Ino: 11, Size: 200, MTime: 2000}
)
func saved(t *testing.T, c *Cache, present ...ID) string {
t.Helper()
path := filepath.Join(t.TempDir(), "sub", "dl.cache")
if err := c.Save(path, present); err != nil {
t.Fatal(err)
}
return path
}
// TestLookupAfterReload: answers stored and saved come back after a Load
// with the same fingerprint, for any keywords the entry covers.
func TestLookupAfterReload(t *testing.T) {
c := New("fp")
c.Store(a, map[string]bool{"k:acme": true, "k:faktura": false, "k:nip": true})
path := saved(t, c, a)
got, err := Load(path, "fp")
if err != nil {
t.Fatal(err)
}
hits, ok := got.Lookup(a, []string{"k:faktura", "k:nip"})
if !ok || !reflect.DeepEqual(hits, []bool{false, true}) {
t.Errorf("Lookup = %v, %v; want [false true], true", hits, ok)
}
if _, ok := got.Lookup(a, []string{"k:acme", "k:new"}); ok {
t.Error("a keyword the entry was never checked against must be a miss")
}
if _, ok := got.Lookup(b, []string{"k:acme"}); ok {
t.Error("a file never stored must be a miss")
}
}
// TestLookupBeforeSave: what was stored in this run answers at once.
func TestLookupBeforeSave(t *testing.T) {
c := New("fp")
c.Store(a, map[string]bool{"k:acme": true})
if hits, ok := c.Lookup(a, []string{"k:acme"}); !ok || !hits[0] {
t.Errorf("Lookup = %v, %v", hits, ok)
}
}
// TestChangedFileMisses: a different size or modification time is a
// different ID, so nothing stored for the old one answers.
func TestChangedFileMisses(t *testing.T) {
c := New("fp")
c.Store(a, map[string]bool{"k:acme": true})
for _, id := range []ID{{Dev: 1, Ino: 10, Size: 101, MTime: 1000}, {Dev: 1, Ino: 10, Size: 100, MTime: 1001}} {
if _, ok := c.Lookup(id, []string{"k:acme"}); ok {
t.Errorf("%+v answered from %+v's entry", id, a)
}
}
}
// TestFingerprintMismatchDiscardsAll: a cache written under a different
// extractor fingerprint loads empty, without error.
func TestFingerprintMismatchDiscardsAll(t *testing.T) {
c := New("old")
c.Store(a, map[string]bool{"k:acme": true})
path := saved(t, c, a)
got, err := Load(path, "new")
if err != nil {
t.Fatal(err)
}
if _, ok := got.Lookup(a, []string{"k:acme"}); ok {
t.Error("entry survived a fingerprint change")
}
}
// TestSaveKeepsOnlyPresentFiles: entries for files not passed to Save, from
// this run or an earlier one, are dropped.
func TestSaveKeepsOnlyPresentFiles(t *testing.T) {
c := New("fp")
c.Store(a, map[string]bool{"k:acme": true})
c.Store(b, map[string]bool{"k:acme": false})
path := saved(t, c, a, b)
next, err := Load(path, "fp")
if err != nil {
t.Fatal(err)
}
if err := next.Save(path, []ID{b}); err != nil {
t.Fatal(err)
}
last, err := Load(path, "fp")
if err != nil {
t.Fatal(err)
}
if _, ok := last.Lookup(a, []string{"k:acme"}); ok {
t.Error("a is gone from the directory but its entry was kept")
}
if hits, ok := last.Lookup(b, []string{"k:acme"}); !ok || hits[0] {
t.Errorf("b's entry lost across a reload: %v, %v", hits, ok)
}
}
// TestStoreReplacesLoadedEntry: a file read again this run replaces what
// an earlier run stored for it.
func TestStoreReplacesLoadedEntry(t *testing.T) {
c := New("fp")
c.Store(a, map[string]bool{"k:acme": true})
path := saved(t, c, a)
next, _ := Load(path, "fp")
next.Store(a, map[string]bool{"k:acme": false, "k:new": true})
if hits, ok := next.Lookup(a, []string{"k:acme", "k:new"}); !ok || hits[0] || !hits[1] {
t.Errorf("Lookup = %v, %v; want the new entry", hits, ok)
}
}
// TestSavePermissions: the directory is private and the file readable by
// its owner only, with no temporary file left behind.
func TestSavePermissions(t *testing.T) {
c := New("fp")
c.Store(a, map[string]bool{"k:acme": true})
path := saved(t, c, a)
fi, err := os.Stat(path)
if err != nil {
t.Fatal(err)
}
if perm := fi.Mode().Perm(); perm != 0o600 {
t.Errorf("file mode %o, want 600", perm)
}
di, err := os.Stat(filepath.Dir(path))
if err != nil {
t.Fatal(err)
}
if perm := di.Mode().Perm(); perm != 0o700 {
t.Errorf("directory mode %o, want 700", perm)
}
entries, _ := os.ReadDir(filepath.Dir(path))
if len(entries) != 1 {
t.Errorf("directory holds %d entries, want only the cache", len(entries))
}
}
// TestLoadMissingAndCorrupt: no file is an empty cache and no error; an
// unreadable one is an empty cache and an error saying so.
func TestLoadMissingAndCorrupt(t *testing.T) {
dir := t.TempDir()
c, err := Load(filepath.Join(dir, "none.cache"), "fp")
if err != nil || c == nil {
t.Fatalf("missing: %v, %v", c, err)
}
bad := filepath.Join(dir, "bad.cache")
os.WriteFile(bad, []byte("{not json"), 0o600)
c, err = Load(bad, "fp")
if err == nil || c == nil {
t.Fatalf("corrupt: want an empty cache and an error, got %v, %v", c, err)
}
if _, ok := c.Lookup(a, []string{"k:acme"}); ok {
t.Error("corrupt cache answered")
}
}
// TestSaveWithNothingWritesNothing: a cache that never held an entry, and
// has no file yet, creates none.
func TestSaveWithNothingWritesNothing(t *testing.T) {
path := filepath.Join(t.TempDir(), "sub", "dl.cache")
if err := New("fp").Save(path, []ID{a}); err != nil {
t.Fatal(err)
}
if _, err := os.Stat(filepath.Dir(path)); !os.IsNotExist(err) {
t.Errorf("Save created %s for an empty cache", filepath.Dir(path))
}
}
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