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cpp-ethereum/libdevcore/MemoryDB.cpp at develop · cheny56/cpp-ethereum · GitHub
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/*
This file is part of cpp-ethereum.
cpp-ethereum is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
cpp-ethereum 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
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* @file MemoryDB.cpp
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#
include
"
MemoryDB.h
"
#
include
"
Common.h
"
#
include
"
CommonData.h
"
using
namespace
std
;
using
namespace
dev
;
namespace
dev
{
const
char
*
DBChannel::name
() {
return
"
TDB
"
; }
const
char
*
DBWarn::name
() {
return
"
TDB
"
; }
std::unordered_map<h256, std::string>
MemoryDB::get
()
const
{
#
if
DEV_GUARDED_DB
ReadGuard
l
(x_this);
#
endif
std::unordered_map<h256, std::string> ret;
for
(
auto
const
& i: m_main)
if
(!m_enforceRefs || i.
second
.
second
>
0
)
ret.
insert
(
make_pair
(i.
first
, i.
second
.
first
));
return
ret;
}
MemoryDB& MemoryDB::
operator
=(MemoryDB
const
& _c)
{
if
(
this
== &_c)
return
*
this
;
#
if
DEV_GUARDED_DB
ReadGuard
l
(_c.
x_this
);
WriteGuard
l2
(x_this);
#
endif
m_main = _c.
m_main
;
m_aux = _c.
m_aux
;
return
*
this
;
}
std::string
MemoryDB::lookup
(h256
const
& _h)
const
{
#
if
DEV_GUARDED_DB
ReadGuard
l
(x_this);
#
endif
auto
it = m_main.
find
(_h);
if
(it != m_main.
end
())
{
if
(!m_enforceRefs || it->
second
.
second
>
0
)
return
it->
second
.
first
;
else
cwarn <<
"
Lookup required for value with refcount == 0. This is probably a critical trie issue
"
<< _h;
}
return
std::string
();
}
bool
MemoryDB::exists
(h256
const
& _h)
const
{
#
if
DEV_GUARDED_DB
ReadGuard
l
(x_this);
#
endif
auto
it = m_main.
find
(_h);
if
(it != m_main.
end
() && (!m_enforceRefs || it->
second
.
second
>
0
))
return
true
;
return
false
;
}
void
MemoryDB::insert
(h256
const
& _h, bytesConstRef _v)
{
#
if
DEV_GUARDED_DB
WriteGuard
l
(x_this);
#
endif
auto
it = m_main.
find
(_h);
if
(it != m_main.
end
())
{
it->
second
.
first
= _v.
toString
();
it->
second
.
second
++;
}
else
m_main[_h] =
make_pair
(_v.
toString
(),
1
);
#
if
ETH_PARANOIA
dbdebug <<
"
INST
"
<< _h <<
"
=>
"
<< m_main[_h].
second
;
#
endif
}
bool
MemoryDB::kill
(h256
const
& _h)
{
#
if
DEV_GUARDED_DB
ReadGuard
l
(x_this);
#
endif
if
(m_main.
count
(_h))
{
if
(m_main[_h].
second
>
0
)
{
m_main[_h].
second
--;
return
true
;
}
#
if
ETH_PARANOIA
else
{
//
If we get to this point, then there was probably a node in the level DB which we need to remove and which we have previously
//
used as part of the memory-based MemoryDB. Nothing to be worried about *as long as the node exists in the DB*.
dbdebug <<
"
NOKILL-WAS
"
<< _h;
}
dbdebug <<
"
KILL
"
<< _h <<
"
=>
"
<< m_main[_h].
second
;
}
else
{
dbdebug <<
"
NOKILL
"
<< _h;
#endif
}
return
false
;
}
bytes
MemoryDB::lookupAux
(h256
const
& _h)
const
{
#
if
DEV_GUARDED_DB
ReadGuard
l
(x_this);
#
endif
auto
it = m_aux.
find
(_h);
if
(it != m_aux.
end
() && (!m_enforceRefs || it->
second
.
second
))
return
it->
second
.
first
;
return
bytes
();
}
void
MemoryDB::removeAux
(h256
const
& _h)
{
#
if
DEV_GUARDED_DB
WriteGuard
l
(x_this);
#
endif
m_aux[_h].
second
=
false
;
}
void
MemoryDB::insertAux
(h256
const
& _h, bytesConstRef _v)
{
#
if
DEV_GUARDED_DB
WriteGuard
l
(x_this);
#
endif
m_aux[_h] =
make_pair
(_v.
toBytes
(),
true
);
}
void
MemoryDB::purge
()
{
#
if
DEV_GUARDED_DB
WriteGuard
l
(x_this);
#
endif
//
purge m_main
for
(
auto
it = m_main.
begin
(); it != m_main.
end
(); )
if
(it->
second
.
second
)
++it;
else
it = m_main.
erase
(it);
//
purge m_aux
for
(
auto
it = m_aux.
begin
(); it != m_aux.
end
(); )
if
(it->
second
.
second
)
++it;
else
it = m_aux.
erase
(it);
}
h256Hash
MemoryDB::keys
()
const
{
#
if
DEV_GUARDED_DB
ReadGuard
l
(x_this);
#
endif
h256Hash ret;
for
(
auto
const
& i: m_main)
if
(i.
second
.
second
)
ret.
insert
(i.
first
);
return
ret;
}
}
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