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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/offline_pages/core/prefetch/add_unique_urls_task.h"
#include <map>
#include <memory>
#include <set>
#include <utility>
#include "base/bind.h"
#include "base/callback.h"
#include "base/logging.h"
#include "base/time/time.h"
#include "components/offline_pages/core/prefetch/prefetch_types.h"
#include "components/offline_pages/core/prefetch/store/prefetch_store.h"
#include "components/offline_pages/core/prefetch/store/prefetch_store_utils.h"
#include "sql/connection.h"
#include "sql/statement.h"
#include "sql/transaction.h"
#include "url/gurl.h"
namespace offline_pages {
namespace {
std::map<std::string, std::pair<int64_t, PrefetchItemState>>
FindExistingPrefetchItemsInNamespaceSync(sql::Connection* db,
const std::string& name_space) {
static const char kSql[] =
"SELECT offline_id, state, requested_url FROM prefetch_items"
" WHERE client_namespace = ?";
sql::Statement statement(db->GetCachedStatement(SQL_FROM_HERE, kSql));
statement.BindString(0, name_space);
std::map<std::string, std::pair<int64_t, PrefetchItemState>> result;
while (statement.Step()) {
result.insert(std::make_pair(
statement.ColumnString(2),
std::make_pair(statement.ColumnInt64(0), static_cast<PrefetchItemState>(
statement.ColumnInt(1)))));
}
return result;
}
bool CreatePrefetchItemSync(sql::Connection* db,
const std::string& name_space,
const PrefetchURL& prefetch_url) {
static const char kSql[] =
"INSERT INTO prefetch_items"
" (offline_id, requested_url, client_namespace, client_id, creation_time,"
" freshness_time)"
" VALUES"
" (?, ?, ?, ?, ?, ?)";
int64_t now_internal = base::Time::Now().ToInternalValue();
sql::Statement statement(db->GetCachedStatement(SQL_FROM_HERE, kSql));
statement.BindInt64(0, GenerateOfflineId());
statement.BindString(1, prefetch_url.url.spec());
statement.BindString(2, name_space);
statement.BindString(3, prefetch_url.id);
statement.BindInt64(4, now_internal);
statement.BindInt64(5, now_internal);
return statement.Run();
}
// Adds new prefetch item entries to the store using the URLs and client IDs
// from |candidate_prefetch_urls| and the client's |name_space|. Also cleans up
// entries in the Zombie state from the client's |name_space| except for the
// ones whose URL is contained in |candidate_prefetch_urls|.
// Returns the number of added prefecth items.
AddUniqueUrlsTask::Result AddUrlsAndCleanupZombiesSync(
const std::string& name_space,
const std::vector<PrefetchURL>& candidate_prefetch_urls,
sql::Connection* db) {
if (!db)
return AddUniqueUrlsTask::Result::STORE_ERROR;
sql::Transaction transaction(db);
if (!transaction.Begin())
return AddUniqueUrlsTask::Result::STORE_ERROR;
std::map<std::string, std::pair<int64_t, PrefetchItemState>> existing_items =
FindExistingPrefetchItemsInNamespaceSync(db, name_space);
AddUniqueUrlsTask::Result result(AddUniqueUrlsTask::Result::NOTHING_ADDED);
for (const auto& prefetch_url : candidate_prefetch_urls) {
auto iter = existing_items.find(prefetch_url.url.spec());
if (iter == existing_items.end()) {
if (!CreatePrefetchItemSync(db, name_space, prefetch_url))
return AddUniqueUrlsTask::Result::STORE_ERROR; // Transaction rollback.
result = AddUniqueUrlsTask::Result::URLS_ADDED;
} else {
// Removing from the list of existing items if it was requested again, to
// prevent it from being removed in the next step.
existing_items.erase(iter);
}
}
// Purge remaining zombie IDs.
for (const auto& existing_item : existing_items) {
if (existing_item.second.second != PrefetchItemState::ZOMBIE)
continue;
if (!DeletePrefetchItemByOfflineIdSync(db, existing_item.second.first))
return AddUniqueUrlsTask::Result::STORE_ERROR; // Transaction rollback.
}
if (!transaction.Commit())
return AddUniqueUrlsTask::Result::STORE_ERROR; // Transaction rollback.
return result;
}
}
AddUniqueUrlsTask::AddUniqueUrlsTask(
PrefetchStore* prefetch_store,
const std::string& name_space,
const std::vector<PrefetchURL>& prefetch_urls)
: prefetch_store_(prefetch_store),
name_space_(name_space),
prefetch_urls_(prefetch_urls),
weak_ptr_factory_(this) {}
AddUniqueUrlsTask::~AddUniqueUrlsTask() {}
void AddUniqueUrlsTask::Run() {
prefetch_store_->Execute(base::BindOnce(&AddUrlsAndCleanupZombiesSync,
name_space_, prefetch_urls_),
base::BindOnce(&AddUniqueUrlsTask::OnUrlsAdded,
weak_ptr_factory_.GetWeakPtr()));
}
void AddUniqueUrlsTask::OnUrlsAdded(Result result) {
if (result == Result::URLS_ADDED) {
// TODO(carlosk): schedule NWake here if at least one new entry was added to
// the store.
NOTIMPLEMENTED();
}
TaskComplete();
}
} // namespace offline_pages
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