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epoch.hpp
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epoch.hpp
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#pragma once
#include <vxldollar/lib/numbers.hpp>
#include <type_traits>
#include <unordered_map>
namespace vxldollar
{
/**
* Tag for which epoch an entry belongs to
*/
enum class epoch : uint8_t
{
invalid = 0,
unspecified = 1,
epoch_begin = 2,
epoch_0 = 2,
epoch_1 = 3,
epoch_2 = 4,
max = epoch_2
};
/* This turns epoch_0 into 0 for instance */
std::underlying_type_t<vxldollar::epoch> normalized_epoch (vxldollar::epoch epoch_a);
}
namespace std
{
template <>
struct hash<::vxldollar::epoch>
{
std::size_t operator() (::vxldollar::epoch const & epoch_a) const
{
std::hash<std::underlying_type_t<::vxldollar::epoch>> hash;
return hash (static_cast<std::underlying_type_t<::vxldollar::epoch>> (epoch_a));
}
};
}
namespace vxldollar
{
class epoch_info
{
public:
vxldollar::public_key signer;
vxldollar::link link;
};
class epochs
{
public:
/** Returns true if link matches one of the released epoch links.
* WARNING: just because a legal block contains an epoch link, it does not mean it is an epoch block.
* A legal block containing an epoch link can easily be constructed by sending to an address identical
* to one of the epoch links.
* Epoch blocks follow the following rules and a block must satisfy them all to be a true epoch block:
* epoch blocks are always state blocks
* epoch blocks never change the balance of an account
* epoch blocks always have a link field that starts with the ascii bytes "epoch v1 block" or "epoch v2 block" (and possibly others in the future)
* epoch blocks never change the representative
* epoch blocks are not signed by the account key, they are signed either by genesis or by special epoch keys
*/
bool is_epoch_link (vxldollar::link const & link_a) const;
vxldollar::link const & link (vxldollar::epoch epoch_a) const;
vxldollar::public_key const & signer (vxldollar::epoch epoch_a) const;
vxldollar::epoch epoch (vxldollar::link const & link_a) const;
void add (vxldollar::epoch epoch_a, vxldollar::public_key const & signer_a, vxldollar::link const & link_a);
/** Checks that new_epoch is 1 version higher than epoch */
static bool is_sequential (vxldollar::epoch epoch_a, vxldollar::epoch new_epoch_a);
private:
std::unordered_map<vxldollar::epoch, vxldollar::epoch_info> epochs_m;
};
}