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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/persistent_cache/persistent_cache.h"
#include <cstdint>
#include <memory>
#include "base/containers/span.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_util.h"
#include "components/persistent_cache/backend_params.h"
#include "components/persistent_cache/mock/mock_backend_impl.h"
#include "components/persistent_cache/sqlite/sqlite_backend_impl.h"
#include "components/persistent_cache/sqlite/test_utils.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace {
constexpr const char* kKey = "foo";
using testing::_;
using testing::Return;
class PersistentCacheMockedBackendTest : public testing::Test {
protected:
void SetUp() override {
backend_ = std::make_unique<persistent_cache::MockBackendImpl>(params_);
}
void CreateCache(bool successful) {
EXPECT_CALL(*backend_, Initialize()).WillOnce(Return(successful));
cache_ = std::make_unique<persistent_cache::PersistentCache>(
std::move(backend_));
}
persistent_cache::MockBackendImpl* GetBackend() {
// Can't be called without a cache.
CHECK(cache_);
return static_cast<persistent_cache::MockBackendImpl*>(
cache_->GetBackendForTesting());
}
persistent_cache::BackendParams params_;
std::unique_ptr<persistent_cache::MockBackendImpl> backend_;
std::unique_ptr<persistent_cache::PersistentCache> cache_;
};
} // namespace
namespace persistent_cache {
TEST_F(PersistentCacheMockedBackendTest, CreatingCacheInitializesBackend) {
EXPECT_CALL(*backend_, Initialize()).WillOnce(Return(true));
std::unique_ptr<PersistentCache> cache =
std::make_unique<PersistentCache>(std::move(backend_));
EXPECT_NE(cache->GetBackendForTesting(), nullptr);
}
TEST_F(PersistentCacheMockedBackendTest, CacheFindCallsBackendFind) {
CreateCache(true);
EXPECT_CALL(*GetBackend(), Find(kKey)).WillOnce(Return(nullptr));
cache_->Find(kKey);
}
TEST_F(PersistentCacheMockedBackendTest, CacheInsertCallsBackendInsert) {
CreateCache(true);
EXPECT_CALL(*GetBackend(), Insert(kKey, _, _));
cache_->Insert(kKey, base::byte_span_from_cstring("1"));
}
TEST_F(PersistentCacheMockedBackendTest,
FailedBackendInitializationMeansNoFurtherCalls) {
EXPECT_CALL(*backend_, Insert(kKey, _, _)).Times(0);
EXPECT_CALL(*backend_, Find(kKey)).Times(0);
CreateCache(false);
cache_->Insert(kKey, base::byte_span_from_cstring("1"));
cache_->Find(kKey);
}
#if !BUILDFLAG(IS_FUCHSIA)
class PersistentCacheTest : public testing::Test,
public testing::WithParamInterface<BackendType> {
protected:
// Used to creates a new cache independent from any other.
std::unique_ptr<PersistentCache> OpenCache() {
auto cache = PersistentCache::Open(
(params_provider_.CreateBackendFilesAndBuildParams(GetParam())));
CHECK(cache->GetBackendForTesting());
return cache;
}
// Used to create a new cache with provided params. Use with params copied
// from the creation of another cache to share backing files between the two.
std::unique_ptr<PersistentCache> OpenCache(BackendParams backend_params) {
auto cache = PersistentCache::Open(std::move(backend_params));
CHECK(cache->GetBackendForTesting());
return cache;
}
persistent_cache::test_utils::TestHelper params_provider_;
};
TEST_P(PersistentCacheTest, FindReturnsNullWhenEmpty) {
auto cache = OpenCache();
EXPECT_EQ(cache->Find(kKey), nullptr);
}
TEST_P(PersistentCacheTest, FindReturnsValueWhenPresent) {
auto cache = OpenCache();
for (int i = 0; i < 20; ++i) {
std::string key = base::NumberToString(i);
auto value = base::as_byte_span(key);
EXPECT_EQ(cache->Find(key), nullptr);
cache->Insert(key, value);
std::unique_ptr<Entry> entry = cache->Find(key);
ASSERT_NE(entry, nullptr);
EXPECT_EQ(entry->GetContentSpan(), value);
}
}
TEST_P(PersistentCacheTest, EmptyValueIsStorable) {
auto cache = OpenCache();
cache->Insert(kKey, base::byte_span_from_cstring(""));
EXPECT_EQ(cache->Find(kKey)->GetContentSpan(),
base::span<const std::uint8_t>{});
}
TEST_P(PersistentCacheTest, ValueContainingNullCharIsStorable) {
auto cache = OpenCache();
constexpr std::array<std::uint8_t, 5> value_array{'\0', 'a', 'b', 'c', '\0'};
const base::span<const std::uint8_t> value_span(value_array);
CHECK_EQ(value_span.size(), value_array.size())
<< "All characters must be included in span";
cache->Insert(kKey, value_span);
EXPECT_EQ(cache->Find(kKey)->GetContentSpan(), value_span);
}
TEST_P(PersistentCacheTest, ValueContainingInvalidUtf8IsStorable) {
auto cache = OpenCache();
constexpr std::array<std::uint8_t, 4> value_array{0x20, 0x0F, 0xFF, 0xFF};
const base::span<const std::uint8_t> value_span(value_array);
CHECK(
!base::IsStringUTF8(std::string(value_array.begin(), value_array.end())))
<< "Test needs invalid utf8";
cache->Insert(kKey, value_span);
EXPECT_EQ(cache->Find(kKey)->GetContentSpan(), value_span);
}
TEST_P(PersistentCacheTest, OverwritingChangesValue) {
auto cache = OpenCache();
cache->Insert(kKey, base::byte_span_from_cstring("1"));
cache->Insert(kKey, base::byte_span_from_cstring("2"));
EXPECT_EQ(cache->Find(kKey)->GetContentSpan(),
base::byte_span_from_cstring("2"));
}
TEST_P(PersistentCacheTest, MetadataIsRetrievable) {
EntryMetadata metadata{.input_signature =
base::Time::Now().InMillisecondsSinceUnixEpoch()};
auto cache = OpenCache();
cache->Insert(kKey, base::byte_span_from_cstring("1"), metadata);
auto entry = cache->Find(kKey);
EXPECT_EQ(entry->GetMetadata().input_signature, metadata.input_signature);
EXPECT_NE(entry->GetMetadata().write_timestamp, 0);
}
TEST_P(PersistentCacheTest, OverwritingChangesMetadata) {
EntryMetadata metadata{.input_signature =
base::Time::Now().InMillisecondsSinceUnixEpoch()};
auto cache = OpenCache();
cache->Insert(kKey, base::byte_span_from_cstring("1"), metadata);
EXPECT_EQ(cache->Find(kKey)->GetMetadata().input_signature,
metadata.input_signature);
cache->Insert(kKey, base::byte_span_from_cstring("1"), EntryMetadata{});
EXPECT_EQ(cache->Find(kKey)->GetMetadata().input_signature, 0);
}
TEST_P(PersistentCacheTest, MultipleEphemeralCachesAreIndependent) {
for (int i = 0; i < 3; ++i) {
auto cache = OpenCache();
// `kKey` never inserted in this cache so not found.
EXPECT_EQ(cache->Find(kKey), nullptr);
cache->Insert(kKey, base::byte_span_from_cstring("1"));
// `kKey` now present.
EXPECT_NE(cache->Find(kKey), nullptr);
}
}
TEST_P(PersistentCacheTest, MultipleLiveCachesAreIndependent) {
std::vector<std::unique_ptr<PersistentCache>> caches;
for (int i = 0; i < 3; ++i) {
caches.push_back(OpenCache());
std::unique_ptr<PersistentCache>& cache = caches.back();
// `kKey` never inserted in this cache so not found.
EXPECT_EQ(cache->Find(kKey), nullptr);
cache->Insert(kKey, base::byte_span_from_cstring("1"));
// `kKey` now present.
EXPECT_NE(cache->Find(kKey), nullptr);
}
}
TEST_P(PersistentCacheTest, EphemeralCachesSharingParamsShareData) {
BackendParams backend_params =
params_provider_.CreateBackendFilesAndBuildParams(GetParam());
for (int i = 0; i < 3; ++i) {
auto cache = OpenCache(backend_params.Copy());
// First run, setup.
if (i == 0) {
// `kKey` never inserted so not found.
EXPECT_EQ(cache->Find(kKey), nullptr);
cache->Insert(kKey, base::byte_span_from_cstring("1"));
// `kKey` now present.
EXPECT_NE(cache->Find(kKey), nullptr);
} else {
// `kKey` is present because data is shared.
EXPECT_NE(cache->Find(kKey), nullptr);
}
}
}
TEST_P(PersistentCacheTest, LiveCachesSharingParamsShareData) {
BackendParams backend_params =
params_provider_.CreateBackendFilesAndBuildParams(GetParam());
std::vector<std::unique_ptr<PersistentCache>> caches;
for (int i = 0; i < 3; ++i) {
caches.push_back(OpenCache(backend_params.Copy()));
std::unique_ptr<PersistentCache>& cache = caches.back();
// First run, setup.
if (i == 0) {
// `kKey` never inserted so not found.
EXPECT_EQ(cache->Find(kKey), nullptr);
cache->Insert(kKey, base::byte_span_from_cstring("1"));
// `kKey` now present.
EXPECT_NE(cache->Find(kKey), nullptr);
} else {
// `kKey` is present because data is shared.
EXPECT_NE(cache->Find(kKey), nullptr);
}
}
}
INSTANTIATE_TEST_SUITE_P(All,
PersistentCacheTest,
testing::Values(BackendType::kSqlite));
#endif
} // namespace persistent_cache
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