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// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cache
import (
"bytes"
"encoding/binary"
"fmt"
"internal/testenv"
"os"
"path/filepath"
"testing"
"time"
)
func init() {
verify = false // even if GODEBUG is set
}
func TestBasic(t *testing.T) {
dir, err := os.MkdirTemp("", "cachetest-")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dir)
_, err = Open(filepath.Join(dir, "notexist"))
if err == nil {
t.Fatal(`Open("tmp/notexist") succeeded, want failure`)
}
cdir := filepath.Join(dir, "c1")
if err := os.Mkdir(cdir, 0777); err != nil {
t.Fatal(err)
}
c1, err := Open(cdir)
if err != nil {
t.Fatalf("Open(c1) (create): %v", err)
}
if err := c1.putIndexEntry(dummyID(1), dummyID(12), 13, true); err != nil {
t.Fatalf("addIndexEntry: %v", err)
}
if err := c1.putIndexEntry(dummyID(1), dummyID(2), 3, true); err != nil { // overwrite entry
t.Fatalf("addIndexEntry: %v", err)
}
if entry, err := c1.Get(dummyID(1)); err != nil || entry.OutputID != dummyID(2) || entry.Size != 3 {
t.Fatalf("c1.Get(1) = %x, %v, %v, want %x, %v, nil", entry.OutputID, entry.Size, err, dummyID(2), 3)
}
c2, err := Open(cdir)
if err != nil {
t.Fatalf("Open(c2) (reuse): %v", err)
}
if entry, err := c2.Get(dummyID(1)); err != nil || entry.OutputID != dummyID(2) || entry.Size != 3 {
t.Fatalf("c2.Get(1) = %x, %v, %v, want %x, %v, nil", entry.OutputID, entry.Size, err, dummyID(2), 3)
}
if err := c2.putIndexEntry(dummyID(2), dummyID(3), 4, true); err != nil {
t.Fatalf("addIndexEntry: %v", err)
}
if entry, err := c1.Get(dummyID(2)); err != nil || entry.OutputID != dummyID(3) || entry.Size != 4 {
t.Fatalf("c1.Get(2) = %x, %v, %v, want %x, %v, nil", entry.OutputID, entry.Size, err, dummyID(3), 4)
}
}
func TestGrowth(t *testing.T) {
dir, err := os.MkdirTemp("", "cachetest-")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dir)
c, err := Open(dir)
if err != nil {
t.Fatalf("Open: %v", err)
}
n := 10000
if testing.Short() {
n = 10
}
for i := 0; i < n; i++ {
if err := c.putIndexEntry(dummyID(i), dummyID(i*99), int64(i)*101, true); err != nil {
t.Fatalf("addIndexEntry: %v", err)
}
id := ActionID(dummyID(i))
entry, err := c.Get(id)
if err != nil {
t.Fatalf("Get(%x): %v", id, err)
}
if entry.OutputID != dummyID(i*99) || entry.Size != int64(i)*101 {
t.Errorf("Get(%x) = %x, %d, want %x, %d", id, entry.OutputID, entry.Size, dummyID(i*99), int64(i)*101)
}
}
for i := 0; i < n; i++ {
id := ActionID(dummyID(i))
entry, err := c.Get(id)
if err != nil {
t.Fatalf("Get2(%x): %v", id, err)
}
if entry.OutputID != dummyID(i*99) || entry.Size != int64(i)*101 {
t.Errorf("Get2(%x) = %x, %d, want %x, %d", id, entry.OutputID, entry.Size, dummyID(i*99), int64(i)*101)
}
}
}
func TestVerifyPanic(t *testing.T) {
os.Setenv("GODEBUG", "gocacheverify=1")
initEnv()
defer func() {
os.Unsetenv("GODEBUG")
verify = false
}()
if !verify {
t.Fatal("initEnv did not set verify")
}
dir, err := os.MkdirTemp("", "cachetest-")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dir)
c, err := Open(dir)
if err != nil {
t.Fatalf("Open: %v", err)
}
id := ActionID(dummyID(1))
if err := PutBytes(c, id, []byte("abc")); err != nil {
t.Fatal(err)
}
defer func() {
if err := recover(); err != nil {
t.Log(err)
return
}
}()
PutBytes(c, id, []byte("def"))
t.Fatal("mismatched Put did not panic in verify mode")
}
func dummyID(x int) [HashSize]byte {
var out [HashSize]byte
binary.LittleEndian.PutUint64(out[:], uint64(x))
return out
}
func TestCacheTrim(t *testing.T) {
dir, err := os.MkdirTemp("", "cachetest-")
if err != nil {
t.Fatal(err)
}
defer os.RemoveAll(dir)
c, err := Open(dir)
if err != nil {
t.Fatalf("Open: %v", err)
}
const start = 1000000000
now := int64(start)
c.now = func() time.Time { return time.Unix(now, 0) }
checkTime := func(name string, mtime int64) {
t.Helper()
file := filepath.Join(c.dir, name[:2], name)
info, err := os.Stat(file)
if err != nil {
t.Fatal(err)
}
if info.ModTime().Unix() != mtime {
t.Fatalf("%s mtime = %d, want %d", name, info.ModTime().Unix(), mtime)
}
}
id := ActionID(dummyID(1))
PutBytes(c, id, []byte("abc"))
entry, _ := c.Get(id)
PutBytes(c, ActionID(dummyID(2)), []byte("def"))
mtime := now
checkTime(fmt.Sprintf("%x-a", id), mtime)
checkTime(fmt.Sprintf("%x-d", entry.OutputID), mtime)
// Get should not change recent mtimes.
now = start + 10
c.Get(id)
checkTime(fmt.Sprintf("%x-a", id), mtime)
checkTime(fmt.Sprintf("%x-d", entry.OutputID), mtime)
// Get should change distant mtimes.
now = start + 5000
mtime2 := now
if _, err := c.Get(id); err != nil {
t.Fatal(err)
}
c.OutputFile(entry.OutputID)
checkTime(fmt.Sprintf("%x-a", id), mtime2)
checkTime(fmt.Sprintf("%x-d", entry.OutputID), mtime2)
// Trim should leave everything alone: it's all too new.
if err := c.Trim(); err != nil {
if testenv.SyscallIsNotSupported(err) {
t.Skipf("skipping: Trim is unsupported (%v)", err)
}
t.Fatal(err)
}
if _, err := c.Get(id); err != nil {
t.Fatal(err)
}
c.OutputFile(entry.OutputID)
data, err := os.ReadFile(filepath.Join(dir, "trim.txt"))
if err != nil {
t.Fatal(err)
}
checkTime(fmt.Sprintf("%x-a", dummyID(2)), start)
// Trim less than a day later should not do any work at all.
now = start + 80000
if err := c.Trim(); err != nil {
t.Fatal(err)
}
if _, err := c.Get(id); err != nil {
t.Fatal(err)
}
c.OutputFile(entry.OutputID)
data2, err := os.ReadFile(filepath.Join(dir, "trim.txt"))
if err != nil {
t.Fatal(err)
}
if !bytes.Equal(data, data2) {
t.Fatalf("second trim did work: %q -> %q", data, data2)
}
// Fast forward and do another trim just before the 5 day cutoff.
// Note that because of usedQuantum the cutoff is actually 5 days + 1 hour.
// We used c.Get(id) just now, so 5 days later it should still be kept.
// On the other hand almost a full day has gone by since we wrote dummyID(2)
// and we haven't looked at it since, so 5 days later it should be gone.
now += 5 * 86400
checkTime(fmt.Sprintf("%x-a", dummyID(2)), start)
if err := c.Trim(); err != nil {
t.Fatal(err)
}
if _, err := c.Get(id); err != nil {
t.Fatal(err)
}
c.OutputFile(entry.OutputID)
mtime3 := now
if _, err := c.Get(dummyID(2)); err == nil { // haven't done a Get for this since original write above
t.Fatalf("Trim did not remove dummyID(2)")
}
// The c.Get(id) refreshed id's mtime again.
// Check that another 5 days later it is still not gone,
// but check by using checkTime, which doesn't bring mtime forward.
now += 5 * 86400
if err := c.Trim(); err != nil {
t.Fatal(err)
}
checkTime(fmt.Sprintf("%x-a", id), mtime3)
checkTime(fmt.Sprintf("%x-d", entry.OutputID), mtime3)
// Half a day later Trim should still be a no-op, because there was a Trim recently.
// Even though the entry for id is now old enough to be trimmed,
// it gets a reprieve until the time comes for a new Trim scan.
now += 86400 / 2
if err := c.Trim(); err != nil {
t.Fatal(err)
}
checkTime(fmt.Sprintf("%x-a", id), mtime3)
checkTime(fmt.Sprintf("%x-d", entry.OutputID), mtime3)
// Another half a day later, Trim should actually run, and it should remove id.
now += 86400/2 + 1
if err := c.Trim(); err != nil {
t.Fatal(err)
}
if _, err := c.Get(dummyID(1)); err == nil {
t.Fatal("Trim did not remove dummyID(1)")
}
}
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