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// Copyright (c) 2012 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 "chrome/browser/extensions/activity_log/activity_database.h"
#include <string>
#include "base/command_line.h"
#include "base/logging.h"
#include "base/strings/string_util.h"
#include "base/strings/stringprintf.h"
#include "base/threading/thread.h"
#include "base/threading/thread_checker.h"
#include "base/time/clock.h"
#include "base/time/time.h"
#include "chrome/browser/extensions/activity_log/fullstream_ui_policy.h"
#include "chrome/common/chrome_switches.h"
#include "sql/error_delegate_util.h"
#include "sql/transaction.h"
#include "third_party/sqlite/sqlite3.h"
#if defined(OS_MACOSX)
#include "base/mac/mac_util.h"
#endif
using content::BrowserThread;
namespace extensions {
// A size threshold at which data should be flushed to the database. The
// ActivityDatabase will signal the Delegate to write out data based on a
// periodic timer, but will also initiate a flush if AdviseFlush indicates that
// more than kSizeThresholdForFlush action records are queued in memory. This
// should be set large enough that write costs can be amortized across many
// records, but not so large that too much space can be tied up holding records
// in memory.
static const int kSizeThresholdForFlush = 200;
ActivityDatabase::ActivityDatabase(ActivityDatabase::Delegate* delegate)
: delegate_(delegate),
valid_db_(false),
batch_mode_(true),
already_closed_(false),
did_init_(false) {
if (CommandLine::ForCurrentProcess()->HasSwitch(
switches::kEnableExtensionActivityLogTesting)) {
batching_period_ = base::TimeDelta::FromSeconds(10);
} else {
batching_period_ = base::TimeDelta::FromMinutes(2);
}
}
ActivityDatabase::~ActivityDatabase() {}
void ActivityDatabase::Init(const base::FilePath& db_name) {
if (did_init_) return;
did_init_ = true;
if (BrowserThread::IsMessageLoopValid(BrowserThread::DB))
DCHECK_CURRENTLY_ON(BrowserThread::DB);
db_.set_histogram_tag("Activity");
db_.set_error_callback(
base::Bind(&ActivityDatabase::DatabaseErrorCallback,
base::Unretained(this)));
db_.set_page_size(4096);
db_.set_cache_size(32);
if (!db_.Open(db_name)) {
LOG(ERROR) << db_.GetErrorMessage();
return LogInitFailure();
}
// Wrap the initialization in a transaction so that the db doesn't
// get corrupted if init fails/crashes.
sql::Transaction committer(&db_);
if (!committer.Begin())
return LogInitFailure();
#if defined(OS_MACOSX)
// Exclude the database from backups.
base::mac::SetFileBackupExclusion(db_name);
#endif
if (!delegate_->InitDatabase(&db_))
return LogInitFailure();
sql::InitStatus stat = committer.Commit() ? sql::INIT_OK : sql::INIT_FAILURE;
if (stat != sql::INIT_OK)
return LogInitFailure();
// Pre-loads the first <cache-size> pages into the cache.
// Doesn't do anything if the database is new.
db_.Preload();
valid_db_ = true;
timer_.Start(FROM_HERE,
batching_period_,
this,
&ActivityDatabase::RecordBatchedActions);
}
void ActivityDatabase::LogInitFailure() {
LOG(ERROR) << "Couldn't initialize the activity log database.";
SoftFailureClose();
}
void ActivityDatabase::AdviseFlush(int size) {
if (!valid_db_)
return;
if (!batch_mode_ || size == kFlushImmediately ||
size >= kSizeThresholdForFlush) {
if (!delegate_->FlushDatabase(&db_))
SoftFailureClose();
}
}
void ActivityDatabase::RecordBatchedActions() {
if (valid_db_) {
if (!delegate_->FlushDatabase(&db_))
SoftFailureClose();
}
}
void ActivityDatabase::SetBatchModeForTesting(bool batch_mode) {
if (batch_mode && !batch_mode_) {
timer_.Start(FROM_HERE,
batching_period_,
this,
&ActivityDatabase::RecordBatchedActions);
} else if (!batch_mode && batch_mode_) {
timer_.Stop();
RecordBatchedActions();
}
batch_mode_ = batch_mode;
}
sql::Connection* ActivityDatabase::GetSqlConnection() {
if (BrowserThread::IsMessageLoopValid(BrowserThread::DB))
DCHECK_CURRENTLY_ON(BrowserThread::DB);
if (valid_db_) {
return &db_;
} else {
LOG(WARNING) << "Activity log database is not valid";
return NULL;
}
}
void ActivityDatabase::Close() {
timer_.Stop();
if (!already_closed_) {
RecordBatchedActions();
db_.reset_error_callback();
}
valid_db_ = false;
already_closed_ = true;
// Call DatabaseCloseCallback() just before deleting the ActivityDatabase
// itself--these two objects should have the same lifetime.
delegate_->OnDatabaseClose();
delete this;
}
void ActivityDatabase::HardFailureClose() {
if (already_closed_) return;
valid_db_ = false;
timer_.Stop();
db_.reset_error_callback();
db_.RazeAndClose();
delegate_->OnDatabaseFailure();
already_closed_ = true;
}
void ActivityDatabase::SoftFailureClose() {
valid_db_ = false;
timer_.Stop();
delegate_->OnDatabaseFailure();
}
void ActivityDatabase::DatabaseErrorCallback(int error, sql::Statement* stmt) {
if (sql::IsErrorCatastrophic(error)) {
LOG(ERROR) << "Killing the ActivityDatabase due to catastrophic error.";
HardFailureClose();
} else if (error != SQLITE_BUSY) {
// We ignore SQLITE_BUSY errors because they are presumably transient.
LOG(ERROR) << "Closing the ActivityDatabase due to error.";
SoftFailureClose();
}
}
void ActivityDatabase::RecordBatchedActionsWhileTesting() {
RecordBatchedActions();
timer_.Stop();
}
void ActivityDatabase::SetTimerForTesting(int ms) {
timer_.Stop();
timer_.Start(FROM_HERE,
base::TimeDelta::FromMilliseconds(ms),
this,
&ActivityDatabase::RecordBatchedActionsWhileTesting);
}
// static
bool ActivityDatabase::InitializeTable(sql::Connection* db,
const char* table_name,
const char* content_fields[],
const char* field_types[],
const int num_content_fields) {
if (!db->DoesTableExist(table_name)) {
std::string table_creator =
base::StringPrintf("CREATE TABLE %s (", table_name);
for (int i = 0; i < num_content_fields; i++) {
table_creator += base::StringPrintf("%s%s %s",
i == 0 ? "" : ", ",
content_fields[i],
field_types[i]);
}
table_creator += ")";
if (!db->Execute(table_creator.c_str()))
return false;
} else {
// In case we ever want to add new fields, this initializes them to be
// empty strings.
for (int i = 0; i < num_content_fields; i++) {
if (!db->DoesColumnExist(table_name, content_fields[i])) {
std::string table_updater = base::StringPrintf(
"ALTER TABLE %s ADD COLUMN %s %s; ",
table_name,
content_fields[i],
field_types[i]);
if (!db->Execute(table_updater.c_str()))
return false;
}
}
}
return true;
}
} // namespace extensions
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