def fast_getlastblock( impl=None ):
"""
Fast way to get the last block processed,
without loading the db.
"""
lastblock_path = virtualchain.get_lastblock_filename( impl=impl )
try:
with open(lastblock_path, "r") as f:
data = f.read().strip()
return int(data)
except:
log.exception("Failed to read: %s" % lastblock_path)
return None
def fast_getlastblock( impl=None ):
"""
Fast way to get the last block processed,
without loading the db.
"""
lastblock_path = virtualchain.get_lastblock_filename( impl=impl )
try:
with open(lastblock_path, "r") as f:
data = f.read().strip()
return int(data)
except:
log.exception("Failed to read: %s" % lastblock_path)
return None
def get_db_state(disposition=DISPOSITION_RO):
"""
(required by virtualchain state engine)
Callback to the virtual chain state engine.
Get a handle to our state engine implementation
(i.e. our name database).
Note that in this implementation, the database
handle returned will only support read-only operations by default.
NO COMMITS WILL BE ALLOWED.
"""
# make this usable even if we haven't explicitly configured virtualchain
impl = virtualchain.get_implementation()
if impl is None:
impl = sys.modules[__name__]
db_filename = virtualchain.get_db_filename(impl=impl)
lastblock_filename = virtualchain.get_lastblock_filename(impl=impl)
lastblock = None
firstcheck = True
for path in [db_filename, lastblock_filename]:
if os.path.exists(path):
# have already created the db
firstcheck = False
if not firstcheck and not os.path.exists(lastblock_filename):
# this can't ever happen
log.error("FATAL: no such file or directory: %s" % lastblock_filename)
os.abort()
# verify that it is well-formed, if it exists
elif os.path.exists(lastblock_filename):
try:
with open(lastblock_filename, "r") as f:
lastblock = int(f.read().strip())
except Exception, e:
# this can't ever happen
log.error("FATAL: failed to parse: %s" % lastblock_filename)
log.exception(e)
os.abort()
def get_db_state( disposition=DISPOSITION_RO ):
"""
(required by virtualchain state engine)
Callback to the virtual chain state engine.
Get a handle to our state engine implementation
(i.e. our name database).
Note that in this implementation, the database
handle returned will only support read-only operations by default.
NO COMMITS WILL BE ALLOWED.
"""
# make this usable even if we haven't explicitly configured virtualchain
impl = virtualchain.get_implementation()
if impl is None:
impl = sys.modules[__name__]
db_filename = virtualchain.get_db_filename(impl=impl)
lastblock_filename = virtualchain.get_lastblock_filename(impl=impl)
lastblock = None
firstcheck = True
for path in [db_filename, lastblock_filename]:
if os.path.exists( path ):
# have already created the db
firstcheck = False
if not firstcheck and not os.path.exists( lastblock_filename ):
# this can't ever happen
log.error("FATAL: no such file or directory: %s" % lastblock_filename )
os.abort()
# verify that it is well-formed, if it exists
elif os.path.exists( lastblock_filename ):
try:
with open(lastblock_filename, "r") as f:
lastblock = int( f.read().strip() )
except Exception, e:
# this can't ever happen
log.error("FATAL: failed to parse: %s" % lastblock_filename)
log.exception(e)
os.abort()
def clean( confirm=True ):
"""
Remove blockstore's db, lastblock, and snapshot files.
Prompt for confirmation
"""
delete = False
exit_status = 0
if confirm:
warning = "WARNING: THIS WILL DELETE YOUR BLOCKSTORE DATABASE!\n"
warning+= "Are you sure you want to proceed?\n"
warning+= "Type 'YES' if so: "
value = raw_input( warning )
if value != "YES":
sys.exit(exit_status)
else:
delete = True
else:
delete = True
if delete:
print "Deleting..."
db_filename = virtualchain.get_db_filename()
lastblock_filename = virtualchain.get_lastblock_filename()
snapshots_filename = virtualchain.get_snapshots_filename()
for path in [db_filename, lastblock_filename, snapshots_filename]:
try:
os.unlink( path )
except:
log.warning("Unable to delete '%s'" % path)
exit_status = 1
sys.exit(exit_status)
def get_last_block():
"""
Get the last block processed
Return the integer on success
Return None on error
"""
# make this usable even if we haven't explicitly configured virtualchain
impl = virtualchain.get_implementation()
if impl is None:
impl = sys.modules[__name__]
lastblock_filename = virtualchain.get_lastblock_filename(impl=impl)
if os.path.exists(lastblock_filename):
try:
with open(lastblock_filename, "r") as f:
lastblock = int(f.read().strip())
return lastblock
except Exception, e:
# this can't ever happen
log.exception(e)
return None
