xrpl::NegativeUNLVote Class Reference

Manager to create NegativeUNL votes. More...

#include <NegativeUNLVote.h>

Collaboration diagram for xrpl::NegativeUNLVote:

Classes
struct	Candidates
	UNLModify Tx candidates. More...

Public Types
enum class	NegativeUNLModify { ToDisable , ToReEnable }
	A flag indicating whether a UNLModify Tx is to disable or to re-enable a validator. More...

Public Member Functions
	NegativeUNLVote (NodeID const &myId, beast::Journal j)
	Constructor.
	~NegativeUNLVote ()=default
void	doVoting (std::shared_ptr< Ledger const > const &prevLedger, hash_set< PublicKey > const &unlKeys, RCLValidations &validations, std::shared_ptr< SHAMap > const &initialSet)
	Cast our local vote on the NegativeUNL candidates.
void	newValidators (LedgerIndex seq, hash_set< NodeID > const &nowTrusted)
	Notify NegativeUNLVote that new validators are added.

Static Public Attributes
static constexpr size_t	kNegativeUnlLowWaterMark = kFlagLedgerInterval * 50 / 100
	A validator is considered unreliable if its validations is less than negativeUNLLowWaterMark in the last flag ledger period.
static constexpr size_t	kNegativeUnlHighWaterMark = kFlagLedgerInterval * 80 / 100
	An unreliable validator must have more than negativeUNLHighWaterMark validations in the last flag ledger period to be re-enabled.
static constexpr size_t	kNegativeUnlMinLocalValsToVote = kFlagLedgerInterval * 90 / 100
	The minimum number of validations of the local node for it to participate in the voting.
static constexpr size_t	kNewValidatorDisableSkip = kFlagLedgerInterval * 2
	We don't want to disable new validators immediately after adding them.
static constexpr float	kNegativeUnlMaxListed = 0.25
	We only want to put 25% of the UNL on the NegativeUNL.

Private Member Functions
void	addTx (LedgerIndex seq, PublicKey const &vp, NegativeUNLModify modify, std::shared_ptr< SHAMap > const &initialSet)
	Add a ttUNL_MODIFY Tx to the transaction set.
std::optional< hash_map< NodeID, std::uint32_t > >	buildScoreTable (std::shared_ptr< Ledger const > const &prevLedger, hash_set< NodeID > const &unl, RCLValidations &validations)
	Build a reliability measurement score table of validators' validation messages in the last flag ledger period.
Candidates	findAllCandidates (hash_set< NodeID > const &unl, hash_set< NodeID > const &negUnl, hash_map< NodeID, std::uint32_t > const &scoreTable)
	Process the score table and find all disabling and re-enabling candidates.
void	purgeNewValidators (LedgerIndex seq)
	Purge validators that are not new anymore.

Static Private Member Functions
static NodeID	choose (uint256 const &randomPadData, std::vector< NodeID > const &candidates)
	Pick one candidate from a vector of candidates.

Private Attributes
NodeID const	myId_
beast::Journal	j_
std::mutex	mutex_
hash_map< NodeID, LedgerIndex >	newValidators_

Friends
class	test::NegativeUNLVoteInternal_test
class	test::NegativeUNLVoteScoreTable_test

Detailed Description

Manager to create NegativeUNL votes.

Definition at line 26 of file NegativeUNLVote.h.

Member Enumeration Documentation

NegativeUNLModify

enum class xrpl::NegativeUNLVote::NegativeUNLModify

strong

A flag indicating whether a UNLModify Tx is to disable or to re-enable a validator.

Enumerator
ToDisable
ToReEnable

Definition at line 60 of file NegativeUNLVote.h.

Constructor & Destructor Documentation

NegativeUNLVote()

xrpl::NegativeUNLVote::NegativeUNLVote	(	NodeID const &	myId,
		beast::Journal	j )

Constructor.

Parameters

myId	the NodeID of the local node
j	log

Definition at line 32 of file NegativeUNLVote.cpp.

~NegativeUNLVote()

xrpl::NegativeUNLVote::~NegativeUNLVote ( )

default

Member Function Documentation

doVoting()

void xrpl::NegativeUNLVote::doVoting	(	std::shared_ptr< Ledger const > const &	prevLedger,
		hash_set< PublicKey > const &	unlKeys,
		RCLValidations &	validations,
		std::shared_ptr< SHAMap > const &	initialSet )

Cast our local vote on the NegativeUNL candidates.

Parameters

prevLedger	the parent ledger
unlKeys	the trusted master keys of validators in the UNL
validations	the validation message container

Note

validations is an in/out parameter. It contains validation messages that will be deleted when no longer needed by other consensus logic. This function asks it to keep the validation messages long enough for this function to use.

Parameters

initialSet

the transactions set for adding ttUNL_MODIFY Tx if any

Definition at line 37 of file NegativeUNLVote.cpp.

newValidators()

void xrpl::NegativeUNLVote::newValidators	(	LedgerIndex	seq,
		hash_set< NodeID > const &	nowTrusted )

Notify NegativeUNLVote that new validators are added.

So that they don't get voted to the NegativeUNL immediately.

Parameters

seq	the current LedgerIndex when adding the new validators
nowTrusted	the new validators

Definition at line 310 of file NegativeUNLVote.cpp.

addTx()

void xrpl::NegativeUNLVote::addTx ( LedgerIndex seq, PublicKey const & vp, NegativeUNLModify modify, std::shared_ptr< SHAMap > const & initialSet )

private

Add a ttUNL_MODIFY Tx to the transaction set.

Parameters

seq	the LedgerIndex when adding the Tx
vp	the master public key of the validator
modify	disabling or re-enabling the validator
initialSet	the transaction set

Definition at line 110 of file NegativeUNLVote.cpp.

choose()

NodeID xrpl::NegativeUNLVote::choose ( uint256 const & randomPadData, std::vector< NodeID > const & candidates )

staticprivate

Pick one candidate from a vector of candidates.

Parameters

randomPadData

the data used for picking a candidate.

Note

Nodes must use the same randomPadData for picking the same candidate. The hash of the parent ledger is used.

Parameters

candidates

the vector of candidates

Returns

the picked candidate

Definition at line 141 of file NegativeUNLVote.cpp.

buildScoreTable()

std::optional< hash_map< NodeID, std::uint32_t > > xrpl::NegativeUNLVote::buildScoreTable ( std::shared_ptr< Ledger const > const & prevLedger, hash_set< NodeID > const & unl, RCLValidations & validations )

private

Build a reliability measurement score table of validators' validation messages in the last flag ledger period.

Parameters

prevLedger	the parent ledger
unl	the trusted master keys
validations	the validation container

Note

validations is an in/out parameter. It contains validation messages that will be deleted when no longer needed by other consensus logic. This function asks it to keep the validation messages long enough for this function to use.

Returns

the built scoreTable or empty optional if table could not be built

Definition at line 158 of file NegativeUNLVote.cpp.

findAllCandidates()

NegativeUNLVote::Candidates xrpl::NegativeUNLVote::findAllCandidates ( hash_set< NodeID > const & unl, hash_set< NodeID > const & negUnl, hash_map< NodeID, std::uint32_t > const & scoreTable )

private

Process the score table and find all disabling and re-enabling candidates.

Parameters

unl	the trusted master keys
negUnl	the NegativeUNL
scoreTable	the score table

Returns

the candidates to disable and the candidates to re-enable

Definition at line 236 of file NegativeUNLVote.cpp.

purgeNewValidators()

void xrpl::NegativeUNLVote::purgeNewValidators ( LedgerIndex seq )

private

Purge validators that are not new anymore.

Parameters

seq	the current LedgerIndex

Definition at line 324 of file NegativeUNLVote.cpp.

Friends And Related Symbol Documentation

test::NegativeUNLVoteInternal_test

friend class test::NegativeUNLVoteInternal_test

friend

Definition at line 188 of file NegativeUNLVote.h.

test::NegativeUNLVoteScoreTable_test

friend class test::NegativeUNLVoteScoreTable_test

friend

Definition at line 189 of file NegativeUNLVote.h.

Member Data Documentation

kNegativeUnlLowWaterMark

size_t xrpl::NegativeUNLVote::kNegativeUnlLowWaterMark = kFlagLedgerInterval * 50 / 100

staticconstexpr

A validator is considered unreliable if its validations is less than negativeUNLLowWaterMark in the last flag ledger period.

An unreliable validator is a candidate to be disabled by the NegativeUNL protocol.

Definition at line 35 of file NegativeUNLVote.h.

kNegativeUnlHighWaterMark

size_t xrpl::NegativeUNLVote::kNegativeUnlHighWaterMark = kFlagLedgerInterval * 80 / 100

staticconstexpr

An unreliable validator must have more than negativeUNLHighWaterMark validations in the last flag ledger period to be re-enabled.

Definition at line 40 of file NegativeUNLVote.h.

kNegativeUnlMinLocalValsToVote

size_t xrpl::NegativeUNLVote::kNegativeUnlMinLocalValsToVote = kFlagLedgerInterval * 90 / 100

staticconstexpr

The minimum number of validations of the local node for it to participate in the voting.

Definition at line 45 of file NegativeUNLVote.h.

kNewValidatorDisableSkip

size_t xrpl::NegativeUNLVote::kNewValidatorDisableSkip = kFlagLedgerInterval * 2

staticconstexpr

We don't want to disable new validators immediately after adding them.

So we skip voting for disabling them for 2 flag ledgers.

Definition at line 50 of file NegativeUNLVote.h.

kNegativeUnlMaxListed

float xrpl::NegativeUNLVote::kNegativeUnlMaxListed = 0.25

staticconstexpr

We only want to put 25% of the UNL on the NegativeUNL.

Definition at line 54 of file NegativeUNLVote.h.

myId_

NodeID const xrpl::NegativeUNLVote::myId_

private

Definition at line 104 of file NegativeUNLVote.h.

j_

beast::Journal xrpl::NegativeUNLVote::j_

private

Definition at line 105 of file NegativeUNLVote.h.

mutex_

std::mutex xrpl::NegativeUNLVote::mutex_

mutableprivate

Definition at line 106 of file NegativeUNLVote.h.

newValidators_

hash_map<NodeID, LedgerIndex> xrpl::NegativeUNLVote::newValidators_

private

Definition at line 107 of file NegativeUNLVote.h.