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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.
#ifndef SQL_DIAGNOSTIC_ERROR_DELEGATE_H_
#define SQL_DIAGNOSTIC_ERROR_DELEGATE_H_
#pragma once
#include "base/logging.h"
#include "base/metrics/histogram.h"
#include "sql/connection.h"
#include "sql/sql_export.h"
namespace sql {
// This class handles the exceptional sqlite errors that we might encounter
// if for example the db is corrupted. Right now we just generate a UMA
// histogram for release and an assert for debug builds.
//
// Why is it a template you ask? well, that is a funny story. The histograms
// need to be singletons that is why they are always static at the function
// scope, but we cannot use the Singleton class because they are not default
// constructible. The template parameter makes the compiler to create unique
// classes that don't share the same static variable.
template <class UniqueT>
class DiagnosticErrorDelegate : public ErrorDelegate {
public:
virtual int OnError(int error, Connection* connection,
Statement* stmt) {
LOG(ERROR) << "sqlite error " << error
<< ", errno " << connection->GetLastErrno()
<< ": " << connection->GetErrorMessage();
RecordErrorInHistogram(error);
return error;
}
private:
static void RecordErrorInHistogram(int error) {
// Trim off the extended error codes.
error &= 0xff;
// The histogram values from sqlite result codes go currently from 1 to
// 26 currently but 50 gives them room to grow.
UMA_HISTOGRAM_ENUMERATION(UniqueT::name(), error, 50);
}
};
} // namespace sql
#endif // SQL_DIAGNOSTIC_ERROR_DELEGATE_H_
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