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// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2009-2015 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_ALERT_H
#define BITCOIN_ALERT_H
#include "serialize.h"
#include "sync.h"
#include <map>
#include <set>
#include <stdint.h>
#include <string>
class CAlert;
class CNode;
class uint256;
extern std::map<uint256, CAlert> mapAlerts;
extern CCriticalSection cs_mapAlerts;
/** Alerts are for notifying old versions if they become too obsolete and
* need to upgrade. The message is displayed in the status bar.
* Alert messages are broadcast as a vector of signed data. Unserializing may
* not read the entire buffer if the alert is for a newer version, but older
* versions can still relay the original data.
*/
class CUnsignedAlert
{
public:
int nVersion;
int64_t nRelayUntil; // when newer nodes stop relaying to newer nodes
int64_t nExpiration;
int nID;
int nCancel;
std::set<int> setCancel;
int nMinVer; // lowest version inclusive
int nMaxVer; // highest version inclusive
std::set<std::string> setSubVer; // empty matches all
int nPriority;
// Actions
std::string strComment;
std::string strStatusBar;
std::string strReserved;
ADD_SERIALIZE_METHODS;
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
READWRITE(this->nVersion);
nVersion = this->nVersion;
READWRITE(nRelayUntil);
READWRITE(nExpiration);
READWRITE(nID);
READWRITE(nCancel);
READWRITE(setCancel);
READWRITE(nMinVer);
READWRITE(nMaxVer);
READWRITE(setSubVer);
READWRITE(nPriority);
READWRITE(LIMITED_STRING(strComment, 65536));
READWRITE(LIMITED_STRING(strStatusBar, 256));
READWRITE(LIMITED_STRING(strReserved, 256));
}
void SetNull();
std::string ToString() const;
};
/** An alert is a combination of a serialized CUnsignedAlert and a signature. */
class CAlert : public CUnsignedAlert
{
public:
std::vector<unsigned char> vchMsg;
std::vector<unsigned char> vchSig;
CAlert()
{
SetNull();
}
ADD_SERIALIZE_METHODS;
template <typename Stream, typename Operation>
inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
READWRITE(vchMsg);
READWRITE(vchSig);
}
void SetNull();
bool IsNull() const;
uint256 GetHash() const;
bool IsInEffect() const;
bool Cancels(const CAlert& alert) const;
bool AppliesTo(int nVersion, const std::string& strSubVerIn) const;
bool AppliesToMe() const;
bool RelayTo(CNode* pnode) const;
bool CheckSignature(const std::vector<unsigned char>& alertKey) const;
bool ProcessAlert(const std::vector<unsigned char>& alertKey, bool fThread = true); // fThread means run -alertnotify in a free-running thread
static void Notify(const std::string& strMessage, bool fThread);
/*
* Get copy of (active) alert object by hash. Returns a null alert if it is not found.
*/
static CAlert getAlertByHash(const uint256 &hash);
};
#endif // BITCOIN_ALERT_H
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