class CheckpointService:
STASHED_CHECKPOINTS_BEFORE_CATCHUP = 1
# TODO: Remove view_no from key after implementing INDY-1336
CheckpointKey = NamedTuple('CheckpointKey', [('view_no', int),
('pp_seq_no', int),
('digest', str)])
def __init__(
self,
data: ConsensusSharedData,
bus: InternalBus,
network: ExternalBus,
stasher: StashingRouter,
db_manager: DatabaseManager,
metrics: MetricsCollector = NullMetricsCollector(),
):
self._data = data
self._bus = bus
self._network = network
self._stasher = stasher
self._subscription = Subscription()
self._validator = CheckpointMsgValidator(self._data)
self._db_manager = db_manager
self.metrics = metrics
# Received checkpoints, mapping CheckpointKey -> List(node_alias)
self._received_checkpoints = defaultdict(
set) # type: Dict[CheckpointService.CheckpointKey, Set[str]]
self._config = getConfig()
self._logger = getlogger()
self._subscription.subscribe(stasher, Checkpoint,
self.process_checkpoint)
self._subscription.subscribe(bus, Ordered, self.process_ordered)
self._subscription.subscribe(bus, BackupSetupLastOrdered,
self.process_backup_setup_last_ordered)
self._subscription.subscribe(bus, NewViewAccepted,
self.process_new_view_accepted)
def cleanup(self):
self._subscription.unsubscribe_all()
@property
def view_no(self):
return self._data.view_no
@property
def is_master(self):
return self._data.is_master
@property
def last_ordered_3pc(self):
return self._data.last_ordered_3pc
@measure_consensus_time(MetricsName.PROCESS_CHECKPOINT_TIME,
MetricsName.BACKUP_PROCESS_CHECKPOINT_TIME)
def process_checkpoint(self, msg: Checkpoint, sender: str) -> (bool, str):
"""
Process checkpoint messages
:return: whether processed (True) or stashed (False)
"""
self._logger.info('{} processing checkpoint {} from {}'.format(
self, msg, sender))
result, reason = self._validator.validate(msg)
if result != PROCESS:
return result, reason
key = self._checkpoint_key(msg)
self._received_checkpoints[key].add(sender)
self._try_to_stabilize_checkpoint(key)
self._start_catchup_if_needed(key)
def process_backup_setup_last_ordered(self, msg: BackupSetupLastOrdered):
if msg.inst_id != self._data.inst_id:
return
self.update_watermark_from_3pc()
def process_ordered(self, ordered: Ordered):
for batch_id in reversed(self._data.preprepared):
if batch_id.pp_seq_no == ordered.ppSeqNo:
self._add_to_checkpoint(batch_id.pp_seq_no, batch_id.view_no,
ordered.auditTxnRootHash)
return
raise LogicError(
"CheckpointService | Can't process Ordered msg because "
"ppSeqNo {} not in preprepared".format(ordered.ppSeqNo))
def _start_catchup_if_needed(self, key: CheckpointKey):
if self._have_own_checkpoint(key):
return
unknown_stabilized = self._unknown_stabilized_checkpoints()
lag_in_checkpoints = len(unknown_stabilized)
if lag_in_checkpoints <= self.STASHED_CHECKPOINTS_BEFORE_CATCHUP:
return
last_key = sorted(unknown_stabilized,
key=lambda v: (v.view_no, v.pp_seq_no))[-1]
if self.is_master:
# TODO: This code doesn't seem to be needed, but it was there. Leaving just in case
# tests explain why it was really needed.
# self._logger.display(
# '{} has lagged for {} checkpoints so updating watermarks to {}'.format(
# self, lag_in_checkpoints, last_key.pp_seq_no))
# self.set_watermarks(low_watermark=last_key.pp_seq_no)
if not self._data.is_primary:
self._logger.display(
'{} has lagged for {} checkpoints so the catchup procedure starts'
.format(self, lag_in_checkpoints))
self._bus.send(NeedMasterCatchup())
else:
self._logger.info(
'{} has lagged for {} checkpoints so adjust last_ordered_3pc to {}, '
'shift watermarks and clean collections'.format(
self, lag_in_checkpoints, last_key.pp_seq_no))
# Adjust last_ordered_3pc, shift watermarks, clean operational
# collections and process stashed messages which now fit between
# watermarks
# TODO: Actually we might need to process view_no from last_key as well, however
# it wasn't processed before, and it will go away when INDY-1336 gets implemented
key_3pc = (self.view_no, last_key.pp_seq_no)
self._bus.send(
NeedBackupCatchup(inst_id=self._data.inst_id,
caught_up_till_3pc=key_3pc))
self.caught_up_till_3pc(key_3pc)
def gc_before_new_view(self):
self._reset_checkpoints()
# ToDo: till_3pc_key should be None?
self._remove_received_checkpoints(till_3pc_key=(self.view_no, 0))
def caught_up_till_3pc(self, caught_up_till_3pc):
# TODO: Add checkpoint using audit ledger
cp_seq_no = caught_up_till_3pc[
1] // self._config.CHK_FREQ * self._config.CHK_FREQ
self._mark_checkpoint_stable(cp_seq_no)
def catchup_clear_for_backup(self):
self._reset_checkpoints()
self._remove_received_checkpoints()
self.set_watermarks(low_watermark=0, high_watermark=sys.maxsize)
def _add_to_checkpoint(self, ppSeqNo, view_no, audit_txn_root_hash):
if ppSeqNo % self._config.CHK_FREQ != 0:
return
key = self.CheckpointKey(view_no=view_no,
pp_seq_no=ppSeqNo,
digest=audit_txn_root_hash)
self._do_checkpoint(ppSeqNo, view_no, audit_txn_root_hash)
self._try_to_stabilize_checkpoint(key)
@measure_consensus_time(MetricsName.SEND_CHECKPOINT_TIME,
MetricsName.BACKUP_SEND_CHECKPOINT_TIME)
def _do_checkpoint(self, pp_seq_no, view_no, audit_txn_root_hash):
self._logger.info(
"{} sending Checkpoint {} view {} audit txn root hash {}".format(
self, pp_seq_no, view_no, audit_txn_root_hash))
checkpoint = Checkpoint(self._data.inst_id, view_no, 0, pp_seq_no,
audit_txn_root_hash)
self._network.send(checkpoint)
self._data.checkpoints.add(checkpoint)
def _try_to_stabilize_checkpoint(self, key: CheckpointKey):
if not self._have_quorum_on_received_checkpoint(key):
return
if not self._have_own_checkpoint(key):
return
self._mark_checkpoint_stable(key.pp_seq_no)
def _mark_checkpoint_stable(self, pp_seq_no):
self._data.stable_checkpoint = pp_seq_no
stable_checkpoints = self._data.checkpoints.irange_key(
min_key=pp_seq_no, max_key=pp_seq_no)
if len(list(stable_checkpoints)) == 0:
# TODO: Is it okay to get view_no like this?
view_no = self._data.last_ordered_3pc[0]
checkpoint = Checkpoint(instId=self._data.inst_id,
viewNo=view_no,
seqNoStart=0,
seqNoEnd=pp_seq_no,
digest=self._audit_txn_root_hash(
view_no, pp_seq_no))
self._data.checkpoints.add(checkpoint)
for cp in self._data.checkpoints.copy():
if cp.seqNoEnd < pp_seq_no:
self._logger.trace("{} removing previous checkpoint {}".format(
self, cp))
self._data.checkpoints.remove(cp)
self.set_watermarks(low_watermark=pp_seq_no)
self._remove_received_checkpoints(till_3pc_key=(self.view_no,
pp_seq_no))
self._bus.send(CheckpointStabilized(
(self.view_no, pp_seq_no))) # call OrderingService.gc()
self._logger.info("{} marked stable checkpoint {}".format(
self, pp_seq_no))
def set_watermarks(self, low_watermark: int, high_watermark: int = None):
self._data.low_watermark = low_watermark
self._data.high_watermark = self._data.low_watermark + self._config.LOG_SIZE \
if high_watermark is None else \
high_watermark
self._logger.info('{} set watermarks as {} {}'.format(
self, self._data.low_watermark, self._data.high_watermark))
self._stasher.process_all_stashed(STASH_WATERMARKS)
def update_watermark_from_3pc(self):
last_ordered_3pc = self.last_ordered_3pc
if (last_ordered_3pc is not None) and (last_ordered_3pc[0]
== self.view_no):
self._logger.info(
"update_watermark_from_3pc to {}".format(last_ordered_3pc))
self.set_watermarks(last_ordered_3pc[1])
else:
self._logger.info(
"try to update_watermark_from_3pc but last_ordered_3pc is None"
)
def _remove_received_checkpoints(self, till_3pc_key=None):
"""
Remove received checkpoints up to `till_3pc_key` if provided,
otherwise remove all received checkpoints
"""
if till_3pc_key is None:
self._received_checkpoints.clear()
self._logger.info(
'{} removing all received checkpoints'.format(self))
return
for cp in list(self._received_checkpoints.keys()):
if self._is_below_3pc_key(cp, till_3pc_key):
self._logger.info(
'{} removing received checkpoints: {}'.format(self, cp))
del self._received_checkpoints[cp]
def _reset_checkpoints(self):
# That function most probably redundant in PBFT approach,
# because according to paper, checkpoints cleared only when next stabilized.
# Avoid using it while implement other services.
self._data.checkpoints.clear()
self._data.checkpoints.append(self._data.initial_checkpoint)
def __str__(self) -> str:
return "{} - checkpoint_service".format(self._data.name)
def discard(self, msg, reason, sender):
self._logger.trace("{} discard message {} from {} "
"with the reason: {}".format(
self, msg, sender, reason))
def _have_own_checkpoint(self, key: CheckpointKey) -> bool:
own_checkpoints = self._data.checkpoints.irange_key(
min_key=key.pp_seq_no, max_key=key.pp_seq_no)
return any(cp.viewNo == key.view_no and cp.digest == key.digest
for cp in own_checkpoints)
def _have_quorum_on_received_checkpoint(self, key: CheckpointKey) -> bool:
votes = self._received_checkpoints[key]
return self._data.quorums.checkpoint.is_reached(len(votes))
def _unknown_stabilized_checkpoints(self) -> List[CheckpointKey]:
return [
key for key in self._received_checkpoints
if self._have_quorum_on_received_checkpoint(key)
and not self._have_own_checkpoint(key)
and not self._is_below_3pc_key(key, self.last_ordered_3pc)
]
@staticmethod
def _is_below_3pc_key(cp: CheckpointKey, key: Tuple[int, int]) -> bool:
return compare_3PC_keys((cp.view_no, cp.pp_seq_no), key) >= 0
@staticmethod
def _checkpoint_key(checkpoint: Checkpoint) -> CheckpointKey:
return CheckpointService.CheckpointKey(view_no=checkpoint.viewNo,
pp_seq_no=checkpoint.seqNoEnd,
digest=checkpoint.digest)
@staticmethod
def _audit_seq_no_from_3pc_key(audit_ledger: Ledger, view_no: int,
pp_seq_no: int) -> int:
# TODO: Should we put it into some common code?
seq_no = audit_ledger.size
while seq_no > 0:
txn = audit_ledger.getBySeqNo(seq_no)
txn_data = get_payload_data(txn)
audit_view_no = txn_data[AUDIT_TXN_VIEW_NO]
audit_pp_seq_no = txn_data[AUDIT_TXN_PP_SEQ_NO]
if audit_view_no == view_no and audit_pp_seq_no == pp_seq_no:
break
seq_no -= 1
return seq_no
def _audit_txn_root_hash(self, view_no: int,
pp_seq_no: int) -> Optional[str]:
audit_ledger = self._db_manager.get_ledger(AUDIT_LEDGER_ID)
# TODO: Should we remove view_no at some point?
seq_no = self._audit_seq_no_from_3pc_key(audit_ledger, view_no,
pp_seq_no)
# TODO: What should we do if txn not found or audit ledger is empty?
if seq_no == 0:
return None
root_hash = audit_ledger.tree.merkle_tree_hash(0, seq_no)
return audit_ledger.hashToStr(root_hash)
def process_new_view_accepted(self, msg: NewViewAccepted):
# 1. update shared data
cp = msg.checkpoint
if cp not in self._data.checkpoints:
self._data.checkpoints.append(cp)
self._mark_checkpoint_stable(cp.seqNoEnd)
self.set_watermarks(low_watermark=cp.seqNoEnd)
# 2. send NewViewCheckpointsApplied
self._bus.send(
NewViewCheckpointsApplied(view_no=msg.view_no,
view_changes=msg.view_changes,
checkpoint=msg.checkpoint,
batches=msg.batches))
return PROCESS, None
class CheckpointService:
STASHED_CHECKPOINTS_BEFORE_CATCHUP = 1
def __init__(
self,
data: ConsensusSharedData,
bus: InternalBus,
network: ExternalBus,
stasher: StashingRouter,
db_manager: DatabaseManager,
metrics: MetricsCollector = NullMetricsCollector(),
):
self._data = data
self._bus = bus
self._network = network
self._checkpoint_state = SortedDict(lambda k: k[1])
self._stasher = stasher
self._subscription = Subscription()
self._validator = CheckpointMsgValidator(self._data)
self._db_manager = db_manager
self.metrics = metrics
# Stashed checkpoints for each view. The key of the outermost
# dictionary is the view_no, value being a dictionary with key as the
# range of the checkpoint and its value again being a mapping between
# senders and their sent checkpoint
# Dict[view_no, Dict[(seqNoStart, seqNoEnd), Dict[sender, Checkpoint]]]
self._stashed_recvd_checkpoints = {}
self._config = getConfig()
self._logger = getlogger()
self._subscription.subscribe(stasher, Checkpoint,
self.process_checkpoint)
self._subscription.subscribe(bus, Ordered, self.process_ordered)
self._subscription.subscribe(bus, BackupSetupLastOrdered,
self.process_backup_setup_last_ordered)
self._subscription.subscribe(bus, NewViewAccepted,
self.process_new_view_accepted)
def cleanup(self):
self._subscription.unsubscribe_all()
@property
def view_no(self):
return self._data.view_no
@property
def is_master(self):
return self._data.is_master
@property
def last_ordered_3pc(self):
return self._data.last_ordered_3pc
@measure_consensus_time(MetricsName.PROCESS_CHECKPOINT_TIME,
MetricsName.BACKUP_PROCESS_CHECKPOINT_TIME)
def process_checkpoint(self, msg: Checkpoint, sender: str) -> (bool, str):
"""
Process checkpoint messages
:return: whether processed (True) or stashed (False)
"""
if msg.instId != self._data.inst_id:
return None, None
self._logger.info('{} processing checkpoint {} from {}'.format(
self, msg, sender))
result, reason = self._validator.validate(msg)
if result == PROCESS:
self._do_process_checkpoint(msg, sender)
return result, reason
def _do_process_checkpoint(self, msg: Checkpoint, sender: str) -> bool:
"""
Process checkpoint messages
:return: whether processed (True) or stashed (False)
"""
seqNoEnd = msg.seqNoEnd
seqNoStart = msg.seqNoStart
key = (seqNoStart, seqNoEnd)
if key not in self._checkpoint_state or not self._checkpoint_state[
key].digest:
self._stash_checkpoint(msg, sender)
self._remove_stashed_checkpoints(self.last_ordered_3pc)
self._start_catchup_if_needed()
return False
checkpoint_state = self._checkpoint_state[key]
# Raise the error only if master since only master's last
# ordered 3PC is communicated during view change
if self.is_master and checkpoint_state.digest != msg.digest:
self._logger.warning("{} received an incorrect digest {} for "
"checkpoint {} from {}".format(
self, msg.digest, key, sender))
return True
checkpoint_state.receivedDigests[sender] = msg.digest
self._check_if_checkpoint_stable(key)
return True
def process_backup_setup_last_ordered(self, msg: BackupSetupLastOrdered):
if msg.inst_id != self._data.inst_id:
return
self.update_watermark_from_3pc()
def process_ordered(self, ordered: Ordered):
if ordered.instId != self._data.inst_id:
return
for batch_id in reversed(self._data.preprepared):
if batch_id.pp_seq_no == ordered.ppSeqNo:
self._add_to_checkpoint(batch_id.pp_seq_no, batch_id.pp_digest,
ordered.ledgerId, batch_id.view_no,
ordered.auditTxnRootHash)
return
raise LogicError(
"CheckpointService | Can't process Ordered msg because "
"ppSeqNo {} not in preprepared".format(ordered.ppSeqNo))
def _start_catchup_if_needed(self):
stashed_checkpoint_ends = self._stashed_checkpoints_with_quorum()
lag_in_checkpoints = len(stashed_checkpoint_ends)
if self._checkpoint_state:
(s, e) = firstKey(self._checkpoint_state)
# If the first stored own checkpoint has a not aligned lower bound
# (this means that it was started after a catch-up), is complete
# and there is a quorumed stashed checkpoint from other replicas
# with the same end then don't include this stashed checkpoint
# into the lag
if s % self._config.CHK_FREQ != 0 \
and self._checkpoint_state[(s, e)].seqNo == e \
and e in stashed_checkpoint_ends:
lag_in_checkpoints -= 1
is_stashed_enough = \
lag_in_checkpoints > self.STASHED_CHECKPOINTS_BEFORE_CATCHUP
if not is_stashed_enough:
return
if self.is_master:
self._logger.display(
'{} has lagged for {} checkpoints so updating watermarks to {}'
.format(self, lag_in_checkpoints, stashed_checkpoint_ends[-1]))
self.set_watermarks(low_watermark=stashed_checkpoint_ends[-1])
if not self._data.is_primary:
self._logger.display(
'{} has lagged for {} checkpoints so the catchup procedure starts'
.format(self, lag_in_checkpoints))
self._bus.send(NeedMasterCatchup())
else:
self._logger.info(
'{} has lagged for {} checkpoints so adjust last_ordered_3pc to {}, '
'shift watermarks and clean collections'.format(
self, lag_in_checkpoints, stashed_checkpoint_ends[-1]))
# Adjust last_ordered_3pc, shift watermarks, clean operational
# collections and process stashed messages which now fit between
# watermarks
key_3pc = (self.view_no, stashed_checkpoint_ends[-1])
self._bus.send(
NeedBackupCatchup(inst_id=self._data.inst_id,
caught_up_till_3pc=key_3pc))
self.caught_up_till_3pc(key_3pc)
def gc_before_new_view(self):
self._reset_checkpoints()
self._remove_stashed_checkpoints(till_3pc_key=(self.view_no, 0))
def caught_up_till_3pc(self, caught_up_till_3pc):
self._reset_checkpoints()
self._remove_stashed_checkpoints(till_3pc_key=caught_up_till_3pc)
self.update_watermark_from_3pc()
def catchup_clear_for_backup(self):
self._reset_checkpoints()
self._remove_stashed_checkpoints()
self.set_watermarks(low_watermark=0, high_watermark=sys.maxsize)
def _add_to_checkpoint(self, ppSeqNo, digest, ledger_id, view_no,
audit_txn_root_hash):
for (s, e) in self._checkpoint_state.keys():
if s <= ppSeqNo <= e:
state = self._checkpoint_state[s, e] # type: CheckpointState
state.digests.append(digest)
state = updateNamedTuple(state, seqNo=ppSeqNo)
self._checkpoint_state[s, e] = state
break
else:
s, e = ppSeqNo, math.ceil(
ppSeqNo / self._config.CHK_FREQ) * self._config.CHK_FREQ
self._logger.debug("{} adding new checkpoint state for {}".format(
self, (s, e)))
state = CheckpointState(ppSeqNo, [
digest,
], None, {}, False)
self._checkpoint_state[s, e] = state
if state.seqNo == e:
if len(state.digests) == self._config.CHK_FREQ:
self._do_checkpoint(state, s, e, ledger_id, view_no,
audit_txn_root_hash)
self._process_stashed_checkpoints((s, e), view_no)
@measure_consensus_time(MetricsName.SEND_CHECKPOINT_TIME,
MetricsName.BACKUP_SEND_CHECKPOINT_TIME)
def _do_checkpoint(self, state, s, e, ledger_id, view_no,
audit_txn_root_hash):
# TODO CheckpointState/Checkpoint is not a namedtuple anymore
# 1. check if updateNamedTuple works for the new message type
# 2. choose another name
# TODO: This is hack of hacks, should be removed when refactoring is complete
if not self.is_master and audit_txn_root_hash is None:
audit_txn_root_hash = "7RJ5bkAKRy2CCvarRij2jiHC16SVPjHcrpVdNsboiQGv"
state = updateNamedTuple(state, digest=audit_txn_root_hash, digests=[])
self._checkpoint_state[s, e] = state
self._logger.info(
"{} sending Checkpoint {} view {} checkpointState digest {}. Ledger {} "
"txn root hash {}. Committed state root hash {} Uncommitted state root hash {}"
.format(
self, (s, e), view_no, state.digest, ledger_id,
self._db_manager.get_txn_root_hash(ledger_id),
self._db_manager.get_state_root_hash(ledger_id,
committed=True),
self._db_manager.get_state_root_hash(ledger_id,
committed=False)))
checkpoint = Checkpoint(self._data.inst_id, view_no, s, e,
state.digest)
self._network.send(checkpoint)
self._data.checkpoints.append(checkpoint)
def _mark_checkpoint_stable(self, seqNo):
previousCheckpoints = []
for (s, e), state in self._checkpoint_state.items():
if e == seqNo:
# TODO CheckpointState/Checkpoint is not a namedtuple anymore
# 1. check if updateNamedTuple works for the new message type
# 2. choose another name
state = updateNamedTuple(state, isStable=True)
self._checkpoint_state[s, e] = state
self._set_stable_checkpoint(e)
break
else:
previousCheckpoints.append((s, e))
else:
self._logger.debug("{} could not find {} in checkpoints".format(
self, seqNo))
return
self.set_watermarks(low_watermark=seqNo)
for k in previousCheckpoints:
self._logger.trace("{} removing previous checkpoint {}".format(
self, k))
self._checkpoint_state.pop(k)
self._remove_stashed_checkpoints(till_3pc_key=(self.view_no, seqNo))
self._bus.send(
CheckpointStabilized(self._data.inst_id, (self.view_no, seqNo)))
self._logger.info("{} marked stable checkpoint {}".format(
self, (s, e)))
def _check_if_checkpoint_stable(self, key: Tuple[int, int]):
ckState = self._checkpoint_state[key]
if self._data.quorums.checkpoint.is_reached(
len(ckState.receivedDigests)):
self._mark_checkpoint_stable(ckState.seqNo)
return True
else:
self._logger.debug('{} has state.receivedDigests as {}'.format(
self, ckState.receivedDigests.keys()))
return False
def _stash_checkpoint(self, ck: Checkpoint, sender: str):
self._logger.debug('{} stashing {} from {}'.format(self, ck, sender))
seqNoStart, seqNoEnd = ck.seqNoStart, ck.seqNoEnd
if ck.viewNo not in self._stashed_recvd_checkpoints:
self._stashed_recvd_checkpoints[ck.viewNo] = {}
stashed_for_view = self._stashed_recvd_checkpoints[ck.viewNo]
if (seqNoStart, seqNoEnd) not in stashed_for_view:
stashed_for_view[seqNoStart, seqNoEnd] = {}
stashed_for_view[seqNoStart, seqNoEnd][sender] = ck
def _stashed_checkpoints_with_quorum(self):
end_pp_seq_numbers = []
quorum = self._data.quorums.checkpoint
for (_, seq_no_end), senders in self._stashed_recvd_checkpoints.get(
self.view_no, {}).items():
if quorum.is_reached(len(senders)):
end_pp_seq_numbers.append(seq_no_end)
return sorted(end_pp_seq_numbers)
def _process_stashed_checkpoints(self, key, view_no):
# Remove all checkpoints from previous views if any
self._remove_stashed_checkpoints(till_3pc_key=(self.view_no, 0))
if key not in self._stashed_recvd_checkpoints.get(view_no, {}):
self._logger.trace("{} have no stashed checkpoints for {}")
return
# Get a snapshot of all the senders of stashed checkpoints for `key`
senders = list(self._stashed_recvd_checkpoints[view_no][key].keys())
total_processed = 0
consumed = 0
for sender in senders:
# Check if the checkpoint from `sender` is still in
# `stashed_recvd_checkpoints` because it might be removed from there
# in case own checkpoint was stabilized when we were processing
# stashed checkpoints from previous senders in this loop
if view_no in self._stashed_recvd_checkpoints \
and key in self._stashed_recvd_checkpoints[view_no] \
and sender in self._stashed_recvd_checkpoints[view_no][key]:
if self.process_checkpoint(
self._stashed_recvd_checkpoints[view_no][key].pop(
sender), sender):
consumed += 1
# Note that if `process_checkpoint` returned False then the
# checkpoint from `sender` was re-stashed back to
# `stashed_recvd_checkpoints`
total_processed += 1
# If we have consumed stashed checkpoints for `key` from all the
# senders then remove entries which have become empty
if view_no in self._stashed_recvd_checkpoints \
and key in self._stashed_recvd_checkpoints[view_no] \
and len(self._stashed_recvd_checkpoints[view_no][key]) == 0:
del self._stashed_recvd_checkpoints[view_no][key]
if len(self._stashed_recvd_checkpoints[view_no]) == 0:
del self._stashed_recvd_checkpoints[view_no]
restashed = total_processed - consumed
self._logger.info('{} processed {} stashed checkpoints for {}, '
'{} of them were stashed again'.format(
self, total_processed, key, restashed))
return total_processed
def reset_watermarks_before_new_view(self):
# Reset any previous view watermarks since for view change to
# successfully complete, the node must have reached the same state
# as other nodes
self.set_watermarks(low_watermark=0)
def should_reset_watermarks_before_new_view(self):
if self.view_no <= 0:
return False
if self.last_ordered_3pc[
0] == self.view_no and self.last_ordered_3pc[1] > 0:
return False
return True
def set_watermarks(self, low_watermark: int, high_watermark: int = None):
self._data.low_watermark = low_watermark
self._data.high_watermark = self._data.low_watermark + self._config.LOG_SIZE \
if high_watermark is None else \
high_watermark
self._logger.info('{} set watermarks as {} {}'.format(
self, self._data.low_watermark, self._data.high_watermark))
self._stasher.process_all_stashed(STASH_WATERMARKS)
def update_watermark_from_3pc(self):
last_ordered_3pc = self.last_ordered_3pc
if (last_ordered_3pc is not None) and (last_ordered_3pc[0]
== self.view_no):
self._logger.info(
"update_watermark_from_3pc to {}".format(last_ordered_3pc))
self.set_watermarks(last_ordered_3pc[1])
else:
self._logger.info(
"try to update_watermark_from_3pc but last_ordered_3pc is None"
)
def _remove_stashed_checkpoints(self, till_3pc_key=None):
"""
Remove stashed received checkpoints up to `till_3pc_key` if provided,
otherwise remove all stashed received checkpoints
"""
if till_3pc_key is None:
self._stashed_recvd_checkpoints.clear()
self._logger.info(
'{} removing all stashed checkpoints'.format(self))
return
for view_no in list(self._stashed_recvd_checkpoints.keys()):
if view_no < till_3pc_key[0]:
self._logger.info(
'{} removing stashed checkpoints for view {}'.format(
self, view_no))
del self._stashed_recvd_checkpoints[view_no]
elif view_no == till_3pc_key[0]:
for (s, e) in list(
self._stashed_recvd_checkpoints[view_no].keys()):
if e <= till_3pc_key[1]:
self._logger.info(
'{} removing stashed checkpoints: '
'viewNo={}, seqNoStart={}, seqNoEnd={}'.format(
self, view_no, s, e))
del self._stashed_recvd_checkpoints[view_no][(s, e)]
if len(self._stashed_recvd_checkpoints[view_no]) == 0:
del self._stashed_recvd_checkpoints[view_no]
def _reset_checkpoints(self):
# That function most probably redundant in PBFT approach,
# because according to paper, checkpoints cleared only when next stabilized.
# Avoid using it while implement other services.
self._checkpoint_state.clear()
self._data.checkpoints.clear()
# TODO: change to = 1 in ViewChangeService integration.
self._data.stable_checkpoint = 0
def _set_stable_checkpoint(self, end_seq_no):
if not list(self._data.checkpoints.irange_key(end_seq_no, end_seq_no)):
raise LogicError('Stable checkpoint must be in checkpoints')
self._data.stable_checkpoint = end_seq_no
self._data.checkpoints = \
SortedListWithKey([c for c in self._data.checkpoints if c.seqNoEnd >= end_seq_no],
key=lambda checkpoint: checkpoint.seqNoEnd)
def __str__(self) -> str:
return "{} - checkpoint_service".format(self._data.name)
# TODO: move to OrderingService as a handler for Cleanup messages
# def _clear_batch_till_seq_no(self, seq_no):
# self._data.preprepared = [pp for pp in self._data.preprepared if pp.ppSeqNo >= seq_no]
# self._data.prepared = [p for p in self._data.prepared if p.ppSeqNo >= seq_no]
def discard(self, msg, reason, sender):
self._logger.trace("{} discard message {} from {} "
"with the reason: {}".format(
self, msg, sender, reason))
def process_new_view_accepted(self, msg: NewViewAccepted):
# 1. update shared data
cp = msg.checkpoint
if cp not in self._data.checkpoints:
self._data.checkpoints.append(cp)
self._set_stable_checkpoint(cp.seqNoEnd)
self.set_watermarks(low_watermark=cp.seqNoEnd)
# 2. send NewViewCheckpointsApplied
self._bus.send(
NewViewCheckpointsApplied(view_no=msg.view_no,
view_changes=msg.view_changes,
checkpoint=msg.checkpoint,
batches=msg.batches))
return PROCESS, None