def hasConsensus(self, reqId: int) -> Optional[str]:
"""
Accepts a request ID and returns True if consensus was reached
for the request or else False
:param reqId: Request ID
"""
replies = self.getRepliesFromAllNodes(reqId)
if not replies:
raise KeyError(reqId) # NOT_FOUND
# Check if at least f+1 replies are received or not.
if self.f + 1 > len(replies):
return False # UNCONFIRMED
else:
onlyResults = {
frm: reply["result"]
for frm, reply in replies.items()
}
resultsList = list(onlyResults.values())
# if all the elements in the resultList are equal - consensus
# is reached.
if all(result == resultsList[0] for result in resultsList):
return resultsList[0] # CONFIRMED
else:
logger.error(
"Received a different result from at least one of the nodes.."
)
return checkIfMoreThanFSameItems(resultsList, self.f)
def checkSufficientRepliesReceived(receivedMsgs: Iterable, reqId: int,
fValue: int):
"""
Checks number of replies for request with specified id in given inbox and
if this number is lower than number of malicious nodes (fValue) -
raises exception
If you do not need response ponder on using
waitForSufficientRepliesForRequests instead
:returns: response for request
"""
receivedReplies = getRepliesFromClientInbox(inbox=receivedMsgs,
reqId=reqId)
logger.debug("received replies for reqId {}: {}".format(
reqId, receivedReplies))
assert len(receivedReplies) > fValue, "Received {} replies but expected " \
"at-least {} for reqId {}". \
format(len(receivedReplies), fValue + 1, reqId)
result = checkIfMoreThanFSameItems(
[reply[f.RESULT.nm] for reply in receivedReplies], fValue)
assert result, "reqId {}: found less than in {} same replies".format(
reqId, fValue)
assert all([r[f.RESULT.nm][f.REQ_ID.nm] == reqId for r in receivedReplies
]), "not all replies have got reqId {}".format(reqId)
return result
def isFinalised(self, f):
if self.finalised is None:
req = checkIfMoreThanFSameItems([v.__getstate__() for v in
self.propagates.values()], f)
if req:
self.finalised = Request.fromState(req)
return self.finalised
def postReplyRecvd(self, reqId, frm, result, numReplies):
if not self.txnLog.hasTxnWithReqId(reqId) and numReplies > self.f:
replies = self.reqRepStore.getReplies(reqId).values()
reply = checkIfMoreThanFSameItems(replies, self.f)
if reply:
self.txnLog.append(reqId, reply)
return reply
def isFinalised(self, f):
if self.finalised is None:
req = checkIfMoreThanFSameItems([v.__getstate__() for v in
self.propagates.values()], f)
if req:
self.finalised = Request.fromState(req)
return self.finalised
def hasConsensus(self, identifier: str, reqId: int) -> Optional[str]:
"""
Accepts a request ID and returns True if consensus was reached
for the request or else False
:param identifier: identifier of the entity making the request
:param reqId: Request ID
"""
replies = self.getRepliesFromAllNodes(identifier, reqId)
if not replies:
raise KeyError('{}{}'.format(identifier, reqId)) # NOT_FOUND
# Check if at least f+1 replies are received or not.
if self.f + 1 > len(replies):
return False # UNCONFIRMED
else:
onlyResults = {frm: reply["result"] for frm, reply in
replies.items()}
resultsList = list(onlyResults.values())
# if all the elements in the resultList are equal - consensus
# is reached.
if all(result == resultsList[0] for result in resultsList):
return resultsList[0] # CONFIRMED
else:
logger.error(
"Received a different result from at least one of the nodes..")
return checkIfMoreThanFSameItems(resultsList, self.f)
def postReplyRecvd(self, identifier, reqId, frm, result, numReplies):
if not self.txnLog.hasTxn(identifier, reqId) and numReplies > self.f:
replies = self.reqRepStore.getReplies(identifier, reqId).values()
reply = checkIfMoreThanFSameItems(replies, self.f)
if reply:
self.txnLog.append(identifier, reqId, reply)
return reply
def hasConsensus(self, reqId: int):
result = self.store.client.command("select hasConsensus from {} where "
"{} = {}".format(
REQ_DATA, f.REQ_ID.nm, reqId))
if result and result[0].oRecordData.get('hasConsensus'):
replies = self.getReplies(reqId).values()
fVal = getMaxFailures(len(list(replies)))
return checkIfMoreThanFSameItems(replies, fVal)
else:
return False
def checkSufficientRepliesRecvd(receivedMsgs: Iterable, reqId: int,
fValue: int):
receivedReplies = getRepliesFromClientInbox(receivedMsgs, reqId)
logger.debug("received replies for reqId {}: {}".
format(reqId, receivedReplies))
assert len(receivedReplies) > fValue, "Received {} replies but expected " \
"at-least {} for reqId {}".\
format(len(receivedReplies), fValue+1, reqId)
result = checkIfMoreThanFSameItems([reply[f.RESULT.nm] for reply in
receivedReplies], fValue)
assert result
assert all([r[f.RESULT.nm][f.REQ_ID.nm] == reqId for r in receivedReplies])
return result
