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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include "mongo/base/string_data.h"
#include "mongo/db/service_context.h"
#include "mongo/stdx/mutex.h"
#include "mongo/util/fail_point_service.h"
#include "mongo/util/time_support.h"
namespace mongo {
extern FailPoint keepDiagnosticCaptureOnFailedLock;
/**
* DiagnosticInfo keeps track of diagnostic information such as a developer provided
* name, the time when a lock was first acquired, and a partial caller call stack.
*/
class DiagnosticInfo {
public:
struct Diagnostic {
static std::shared_ptr<DiagnosticInfo> get(Client*);
static void set(Client*, std::shared_ptr<DiagnosticInfo>);
static void clearDiagnostic();
stdx::mutex m;
std::shared_ptr<DiagnosticInfo> diagnostic;
};
virtual ~DiagnosticInfo() = default;
DiagnosticInfo(const DiagnosticInfo&) = delete;
DiagnosticInfo& operator=(const DiagnosticInfo&) = delete;
DiagnosticInfo(DiagnosticInfo&&) = default;
DiagnosticInfo& operator=(DiagnosticInfo&&) = default;
struct StackFrame {
std::string toString() const;
friend bool operator==(const StackFrame& frame1, const StackFrame& frame2);
friend bool operator!=(const StackFrame& frame1, const StackFrame& frame2) {
return !(frame1 == frame2);
}
StringData objectPath;
uintptr_t instructionOffset = 0;
};
struct StackTrace {
std::string toString() const;
friend bool operator==(const StackTrace& trace1, const StackTrace& trace2);
friend bool operator!=(const StackTrace& trace1, const StackTrace& trace2) {
return !(trace1 == trace2);
}
std::vector<StackFrame> frames;
};
Date_t getTimestamp() const {
return _timestamp;
}
StringData getCaptureName() const {
return _captureName;
}
StackTrace makeStackTrace() const;
static std::vector<void*> getBacktraceAddresses();
std::string toString() const;
friend DiagnosticInfo takeDiagnosticInfo(const StringData& captureName);
private:
friend bool operator==(const DiagnosticInfo& info1, const DiagnosticInfo& info2);
friend bool operator!=(const DiagnosticInfo& info1, const DiagnosticInfo& info2) {
return !(info1 == info2);
}
friend std::ostream& operator<<(std::ostream& s, const DiagnosticInfo& info);
Date_t _timestamp;
StringData _captureName;
std::vector<void*> _backtraceAddresses;
DiagnosticInfo(const Date_t& timestamp,
const StringData& captureName,
std::vector<void*> backtraceAddresses)
: _timestamp(timestamp),
_captureName(captureName),
_backtraceAddresses(backtraceAddresses) {}
};
inline std::ostream& operator<<(std::ostream& s, const DiagnosticInfo::StackFrame& frame) {
return s << frame.toString();
}
inline std::ostream& operator<<(std::ostream& s, const DiagnosticInfo& info) {
return s << info.toString();
}
/**
* Captures the diagnostic information based on the caller's context.
*/
DiagnosticInfo takeDiagnosticInfo(const StringData& captureName);
} // namespace mongo
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