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// Copyright 2025 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_collection.h"
#include "base/containers/span.h"
#include "base/files/file_util.h"
#include "base/files/scoped_temp_dir.h"
#include "base/strings/string_number_conversions.h"
#include "components/persistent_cache/backend_params_manager.h"
#include "components/persistent_cache/entry.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace persistent_cache {
namespace {
// Default value large enough to no interfere with functioning of tests.
constexpr size_t kTargetFootprint = 1024 * 1024 * 100;
TEST(PersistentCacheCollection, Retrieval) {
base::ScopedTempDir temp_dir;
CHECK(temp_dir.CreateUniqueTempDir());
PersistentCacheCollection collection(
std::make_unique<BackendParamsManager>(temp_dir.GetPath()),
kTargetFootprint);
constexpr char first_cache_id[] = "first_cache_id";
constexpr char second_cache_id[] = "second_cache_id";
constexpr char first_key[] = "first_key";
constexpr char second_key[] = "second_key";
constexpr const char first_content[] = "first_content";
// At first there is nothing in the collection.
EXPECT_EQ(collection.Find(first_cache_id, first_key), nullptr);
EXPECT_EQ(collection.Find(first_cache_id, second_key), nullptr);
EXPECT_EQ(collection.Find(second_cache_id, first_key), nullptr);
EXPECT_EQ(collection.Find(second_cache_id, second_key), nullptr);
// Inserting for a certain cache id allows retrieval for this id and this id
// only.
collection.Insert(first_cache_id, first_key,
base::byte_span_from_cstring(first_content));
auto entry = collection.Find(first_cache_id, first_key);
ASSERT_NE(entry, nullptr);
EXPECT_EQ(entry->GetContentSpan(),
base::byte_span_from_cstring(first_content));
EXPECT_EQ(collection.Find(second_cache_id, first_key), nullptr);
}
TEST(PersistentCacheCollection, RetrievalAfterClear) {
base::ScopedTempDir temp_dir;
CHECK(temp_dir.CreateUniqueTempDir());
PersistentCacheCollection collection(
std::make_unique<BackendParamsManager>(temp_dir.GetPath()),
kTargetFootprint);
std::string first_cache_id = "first_cache_id";
std::string first_key = "first_key";
constexpr const char first_content[] = "first_content";
// Test basic retrieval.
EXPECT_EQ(collection.Find(first_cache_id, first_key), nullptr);
collection.Insert(first_cache_id, first_key,
base::byte_span_from_cstring(first_content));
EXPECT_NE(collection.Find(first_cache_id, first_key), nullptr);
// Retrieval still works after clear because data persistence is unnafected by
// lifetime of PersistentCache instances.
collection.ClearForTesting();
EXPECT_NE(collection.Find(first_cache_id, first_key), nullptr);
}
TEST(PersistentCacheCollection, DeleteAllFiles) {
base::ScopedTempDir temp_dir;
CHECK(temp_dir.CreateUniqueTempDir());
PersistentCacheCollection collection(
std::make_unique<BackendParamsManager>(temp_dir.GetPath()),
kTargetFootprint);
std::string first_cache_id = "first_cache_id";
std::string first_key = "first_key";
constexpr const char first_content[] = "first_content";
// Inserting an entry makes it available.
collection.Insert(first_cache_id, first_key,
base::byte_span_from_cstring(first_content));
EXPECT_NE(collection.Find(first_cache_id, first_key), nullptr);
collection.DeleteAllFiles();
// After deletion the content is not available anymore.
EXPECT_EQ(collection.Find(first_cache_id, first_key), nullptr);
}
TEST(PersistentCacheCollection, ContinuousFootPrintReduction) {
base::ScopedTempDir temp_dir;
CHECK(temp_dir.CreateUniqueTempDir());
constexpr int64_t kSmallFootprint = 128;
PersistentCacheCollection collection(
std::make_unique<BackendParamsManager>(temp_dir.GetPath()),
kSmallFootprint);
int i = 0;
int64_t added_footprint = 0;
// Add things right up to the limit where files start to be deleted.
while (added_footprint < kSmallFootprint) {
std::string number = base::NumberToString(i);
// Account for size of key and value.
int64_t footprint_after_insertion = added_footprint + number.length() * 2;
if (footprint_after_insertion < kSmallFootprint) {
int64_t directory_size_before =
base::ComputeDirectorySize(temp_dir.GetPath());
collection.Insert(number, number, base::as_byte_span(number));
int64_t directory_size_after =
base::ComputeDirectorySize(temp_dir.GetPath());
// If there's no footprint reduction and the new values are being stored
// then directory size is just going up.
EXPECT_GT(directory_size_after, directory_size_before);
}
added_footprint = footprint_after_insertion;
++i;
}
// If `kSmallFootprint` is not large enough to trigger at least two successful
// insertions into the cache the test does not provide sufficient coverage.
ASSERT_GT(i, 2);
int64_t directory_size_before =
base::ComputeDirectorySize(temp_dir.GetPath());
// Since no footprint reduction should have been triggered all values added
// should still be available.
for (int j = 0; j < i - 1; ++j) {
std::string number = base::NumberToString(j);
EXPECT_NE(collection.Find(number, number), nullptr);
}
// Add one more item which should bring things over the limit.
std::string number = base::NumberToString(i + 1);
collection.Insert(number, number, base::as_byte_span(number));
int64_t directory_size_after = base::ComputeDirectorySize(temp_dir.GetPath());
// Footprint reduction happened automatically. Note that's it's not possible
// to specifically know what the current footprint is since the last insert
// took place after the footprint reduction.
EXPECT_LT(directory_size_after, directory_size_before);
}
} // namespace
} // namespace persistent_cache
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