Stochastical (IP) address manager. More...

#include <addrman.h>

Collaboration diagram for CAddrMan:

Public Member Functions
template<typename Stream >
void	Serialize (Stream &s_) const
	Serialized format. More...

template<typename Stream >
void	Unserialize (Stream &s_)

void	Clear ()

	CAddrMan ()

	~CAddrMan ()

size_t	size () const
	Return the number of (unique) addresses in all tables. More...

void	Check ()
	Consistency check. More...

bool	Add (const CAddress &addr, const CNetAddr &source, int64_t nTimePenalty=0)
	Add a single address. More...

bool	Add (const std::vector< CAddress > &vAddr, const CNetAddr &source, int64_t nTimePenalty=0)
	Add multiple addresses. More...

void	Good (const CService &addr, bool test_before_evict=true, int64_t nTime=GetAdjustedTime())
	Mark an entry as accessible. More...

void	Attempt (const CService &addr, bool fCountFailure, int64_t nTime=GetAdjustedTime())
	Mark an entry as connection attempted to. More...

void	ResolveCollisions ()
	See if any to-be-evicted tried table entries have been tested and if so resolve the collisions. More...

CAddrInfo	SelectTriedCollision ()
	Randomly select an address in tried that another address is attempting to evict. More...

CAddrInfo	Select (bool newOnly=false)
	Choose an address to connect to. More...

std::vector< CAddress >	GetAddr (size_t max_addresses, size_t max_pct)
	Return a bunch of addresses, selected at random. More...

void	Connected (const CService &addr, int64_t nTime=GetAdjustedTime())
	Mark an entry as currently-connected-to. More...

void	SetServices (const CService &addr, ServiceFlags nServices)

Static Public Member Functions
static std::vector< bool >	DecodeAsmap (fs::path path)

Public Attributes
std::vector< bool >	m_asmap

Protected Member Functions
CAddrInfo *	Find (const CNetAddr &addr, int *pnId=nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Find an entry. More...

CAddrInfo *	Create (const CAddress &addr, const CNetAddr &addrSource, int *pnId=nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs)
	find an entry, creating it if necessary. More...

void	SwapRandom (unsigned int nRandomPos1, unsigned int nRandomPos2) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Swap two elements in vRandom. More...

void	MakeTried (CAddrInfo &info, int nId) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Move an entry from the "new" table(s) to the "tried" table. More...

void	Delete (int nId) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Delete an entry. It must not be in tried, and have refcount 0. More...

void	ClearNew (int nUBucket, int nUBucketPos) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Clear a position in a "new" table. This is the only place where entries are actually deleted. More...

void	Good_ (const CService &addr, bool test_before_evict, int64_t time) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Mark an entry "good", possibly moving it from "new" to "tried". More...

bool	Add_ (const CAddress &addr, const CNetAddr &source, int64_t nTimePenalty) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Add an entry to the "new" table. More...

void	Attempt_ (const CService &addr, bool fCountFailure, int64_t nTime) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Mark an entry as attempted to connect. More...

CAddrInfo	Select_ (bool newOnly) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Select an address to connect to, if newOnly is set to true, only the new table is selected from. More...

void	ResolveCollisions_ () EXCLUSIVE_LOCKS_REQUIRED(cs)
	See if any to-be-evicted tried table entries have been tested and if so resolve the collisions. More...

CAddrInfo	SelectTriedCollision_ () EXCLUSIVE_LOCKS_REQUIRED(cs)
	Return a random to-be-evicted tried table address. More...

void	GetAddr_ (std::vector< CAddress > &vAddr, size_t max_addresses, size_t max_pct) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Select several addresses at once. More...

void	Connected_ (const CService &addr, int64_t nTime) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Mark an entry as currently-connected-to. More...

void	SetServices_ (const CService &addr, ServiceFlags nServices) EXCLUSIVE_LOCKS_REQUIRED(cs)
	Update an entry's service bits. More...

Protected Attributes
RecursiveMutex	cs
	critical section to protect the inner data structures More...

uint256	nKey
	secret key to randomize bucket select with More...

FastRandomContext	insecure_rand
	Source of random numbers for randomization in inner loops. More...

Private Types
enum	Format : uint8_t { V0_HISTORICAL = 0, V1_DETERMINISTIC = 1, V2_ASMAP = 2, V3_BIP155 = 3 }
	Serialization versions. More...

Private Member Functions
int nIdCount	GUARDED_BY (cs)
	last used nId More...

std::map< int, CAddrInfo > mapInfo	GUARDED_BY (cs)
	table with information about all nIds More...

std::map< CNetAddr, int > mapAddr	GUARDED_BY (cs)
	find an nId based on its network address More...

std::vector< int > vRandom	GUARDED_BY (cs)
	randomly-ordered vector of all nIds More...

int nTried	GUARDED_BY (cs)

int vvTried[ADDRMAN_TRIED_BUCKET_COUNT][ADDRMAN_BUCKET_SIZE]	GUARDED_BY (cs)
	list of "tried" buckets More...

int nNew	GUARDED_BY (cs)
	number of (unique) "new" entries More...

int vvNew[ADDRMAN_NEW_BUCKET_COUNT][ADDRMAN_BUCKET_SIZE]	GUARDED_BY (cs)
	list of "new" buckets More...

int64_t nLastGood	GUARDED_BY (cs)
	last time Good was called (memory only) More...

Private Attributes
std::set< int >	m_tried_collisions
	Holds addrs inserted into tried table that collide with existing entries. Test-before-evict discipline used to resolve these collisions. More...

Static Private Attributes
static constexpr Format	FILE_FORMAT = Format::V3_BIP155
	The maximum format this software knows it can unserialize. More...

static constexpr uint8_t	INCOMPATIBILITY_BASE = 32
	The initial value of a field that is incremented every time an incompatible format change is made (such that old software versions would not be able to parse and understand the new file format). More...

Friends
class	CAddrManTest

Detailed Description

Stochastical (IP) address manager.

Definition at line 172 of file addrman.h.

Member Enumeration Documentation

enum CAddrMan::Format : uint8_t

private

Serialization versions.

Enumerator
V0_HISTORICAL	historic format, before commit e6b343d88
V1_DETERMINISTIC	for pre-asmap files
V2_ASMAP	for files including asmap version
V3_BIP155	same as V2_ASMAP plus addresses are in BIP155 format

Definition at line 181 of file addrman.h.

Constructor & Destructor Documentation

CAddrMan::CAddrMan ( )

inline

Definition at line 580 of file addrman.h.

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CAddrMan::~CAddrMan ( )

inline

Definition at line 585 of file addrman.h.

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Member Function Documentation

bool CAddrMan::Add	(	const CAddress &	addr,
		const CNetAddr &	source,
		int64_t	nTimePenalty = `0`
	)

inline

Add a single address.

Definition at line 611 of file addrman.h.

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bool CAddrMan::Add	(	const std::vector< CAddress > &	vAddr,
		const CNetAddr &	source,
		int64_t	nTimePenalty = `0`
	)

inline

Add multiple addresses.

Definition at line 625 of file addrman.h.

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bool CAddrMan::Add_	(	const CAddress &	addr,
		const CNetAddr &	source,
		int64_t	nTimePenalty
	)

protected

Add an entry to the "new" table.

Definition at line 262 of file addrman.cpp.

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void CAddrMan::Attempt	(	const CService &	addr,
		bool	fCountFailure,
		int64_t	nTime = `GetAdjustedTime()`
	)

inline

Mark an entry as connection attempted to.

Definition at line 649 of file addrman.h.

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void CAddrMan::Attempt_	(	const CService &	addr,
		bool	fCountFailure,
		int64_t	nTime
	)

protected

Mark an entry as attempted to connect.

Definition at line 335 of file addrman.cpp.

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void CAddrMan::Check ( )

inline

Consistency check.

Definition at line 598 of file addrman.h.

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void CAddrMan::Clear ( )

inline

Definition at line 556 of file addrman.h.

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void CAddrMan::ClearNew	(	int	nUBucket,
		int	nUBucketPos
	)

protected

Clear a position in a "new" table. This is the only place where entries are actually deleted.

Definition at line 133 of file addrman.cpp.

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void CAddrMan::Connected	(	const CService &	addr,
		int64_t	nTime = `GetAdjustedTime()`
	)

inline

Mark an entry as currently-connected-to.

Definition at line 708 of file addrman.h.

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void CAddrMan::Connected_	(	const CService &	addr,
		int64_t	nTime
	)

protected

Mark an entry as currently-connected-to.

Definition at line 507 of file addrman.cpp.

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CAddrInfo * CAddrMan::Create	(	const CAddress &	addr,
		const CNetAddr &	addrSource,
		int *	pnId = `nullptr`
	)

protected

find an entry, creating it if necessary.

nTime and nServices of the found node are updated, if necessary.

Definition at line 87 of file addrman.cpp.

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std::vector< bool > CAddrMan::DecodeAsmap ( fs::path path )

static

Definition at line 631 of file addrman.cpp.

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void CAddrMan::Delete ( int nId )

protected

Delete an entry. It must not be in tried, and have refcount 0.

Definition at line 119 of file addrman.cpp.

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CAddrInfo * CAddrMan::Find	(	const CNetAddr &	addr,
		int *	pnId = `nullptr`
	)

protected

Find an entry.

Definition at line 74 of file addrman.cpp.

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std::vector<CAddress> CAddrMan::GetAddr	(	size_t	max_addresses,
		size_t	max_pct
	)

inline

Return a bunch of addresses, selected at random.

Definition at line 695 of file addrman.h.

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void CAddrMan::GetAddr_	(	std::vector< CAddress > &	vAddr,
		size_t	max_addresses,
		size_t	max_pct
	)

protected

Select several addresses at once.

Definition at line 482 of file addrman.cpp.

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void CAddrMan::Good	(	const CService &	addr,
		bool	test_before_evict = `true`,
		int64_t	nTime = `GetAdjustedTime()`
	)

inline

Mark an entry as accessible.

Definition at line 640 of file addrman.h.

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void CAddrMan::Good_	(	const CService &	addr,
		bool	test_before_evict,
		int64_t	time
	)

protected

Mark an entry "good", possibly moving it from "new" to "tried".

Definition at line 196 of file addrman.cpp.

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int nIdCount CAddrMan::GUARDED_BY ( cs )

private

last used nId

std::map<int, CAddrInfo> mapInfo CAddrMan::GUARDED_BY ( cs )

private

table with information about all nIds

std::map<CNetAddr, int> mapAddr CAddrMan::GUARDED_BY ( cs )

private

find an nId based on its network address

std::vector<int> vRandom CAddrMan::GUARDED_BY ( cs )

private

randomly-ordered vector of all nIds

int nTried CAddrMan::GUARDED_BY ( cs )

private

int vvTried [ADDRMAN_TRIED_BUCKET_COUNT][ADDRMAN_BUCKET_SIZE] CAddrMan::GUARDED_BY ( cs )

private

list of "tried" buckets

int nNew CAddrMan::GUARDED_BY ( cs )

private

number of (unique) "new" entries

int vvNew [ADDRMAN_NEW_BUCKET_COUNT][ADDRMAN_BUCKET_SIZE] CAddrMan::GUARDED_BY ( cs )

private

list of "new" buckets

int64_t nLastGood CAddrMan::GUARDED_BY ( cs )

private

last time Good was called (memory only)

void CAddrMan::MakeTried	(	CAddrInfo &	info,
		int	nId
	)

protected

Move an entry from the "new" table(s) to the "tried" table.

Definition at line 148 of file addrman.cpp.

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void CAddrMan::ResolveCollisions ( )

inline

See if any to-be-evicted tried table entries have been tested and if so resolve the collisions.

Definition at line 658 of file addrman.h.

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void CAddrMan::ResolveCollisions_ ( )

protected

See if any to-be-evicted tried table entries have been tested and if so resolve the collisions.

Definition at line 545 of file addrman.cpp.

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CAddrInfo CAddrMan::Select ( bool newOnly = false )

inline

Choose an address to connect to.

Definition at line 682 of file addrman.h.

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CAddrInfo CAddrMan::Select_ ( bool newOnly )

protected

Select an address to connect to, if newOnly is set to true, only the new table is selected from.

Definition at line 357 of file addrman.cpp.

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CAddrInfo CAddrMan::SelectTriedCollision ( )

inline

Randomly select an address in tried that another address is attempting to evict.

Definition at line 667 of file addrman.h.

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CAddrInfo CAddrMan::SelectTriedCollision_ ( )

protected

Return a random to-be-evicted tried table address.

Definition at line 604 of file addrman.cpp.

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template<typename Stream >

void CAddrMan::Serialize ( Stream & s_ ) const

inline

Serialized format.

format version byte (
See also
Format)
lowest compatible format version byte. This is used to help old software decide whether to parse the file. For example:
- Bitcoin Core version N knows how to parse up to format=3. If a new format=4 is introduced in version N+1 that is compatible with format=3 and it is known that version N will be able to parse it, then version N+1 will write (format=4, lowest_compatible=3) in the first two bytes of the file, and so version N will still try to parse it.
- Bitcoin Core version N+2 introduces a new incompatible format=5. It will write (format=5, lowest_compatible=5) and so any versions that do not know how to parse format=5 will not try to read the file.
nKey
nNew
nTried
number of "new" buckets XOR 2**30
all nNew addrinfos in vvNew
all nTried addrinfos in vvTried
for each bucket:
- number of elements
- for each element: index

2**30 is xorred with the number of buckets to make addrman deserializer v0 detect it as incompatible. This is necessary because it did not check the version number on deserialization.

Notice that vvTried, mapAddr and vVector are never encoded explicitly; they are instead reconstructed from the other information.

vvNew is serialized, but only used if ADDRMAN_UNKNOWN_BUCKET_COUNT didn't change, otherwise it is reconstructed as well.

This format is more complex, but significantly smaller (at most 1.5 MiB), and supports changes to the ADDRMAN_ parameters without breaking the on-disk structure.

We don't use SERIALIZE_METHODS since the serialization and deserialization code has very little in common.

Definition at line 351 of file addrman.h.

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void CAddrMan::SetServices	(	const CService &	addr,
		ServiceFlags	nServices
	)

inline

Definition at line 716 of file addrman.h.

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void CAddrMan::SetServices_	(	const CService &	addr,
		ServiceFlags	nServices
	)

protected

Update an entry's service bits.

Definition at line 527 of file addrman.cpp.

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size_t CAddrMan::size ( ) const

inline

Return the number of (unique) addresses in all tables.

Definition at line 591 of file addrman.h.

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void CAddrMan::SwapRandom	(	unsigned int	nRandomPos1,
		unsigned int	nRandomPos2
	)

protected

Swap two elements in vRandom.

Definition at line 99 of file addrman.cpp.

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template<typename Stream >

void CAddrMan::Unserialize ( Stream & s_ )

inline

Definition at line 416 of file addrman.h.

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Friends And Related Function Documentation

friend class CAddrManTest

friend

Definition at line 174 of file addrman.h.

Member Data Documentation

RecursiveMutex CAddrMan::cs

mutableprotected

critical section to protect the inner data structures

Definition at line 177 of file addrman.h.

constexpr Format CAddrMan::FILE_FORMAT = Format::V3_BIP155

staticprivate

The maximum format this software knows it can unserialize.

Also, we always serialize in this format. The format (first byte in the serialized stream) can be higher than this and still this software may be able to unserialize the file - if the second byte (see lowest_compatible in Unserialize()) is less or equal to this.

Definition at line 193 of file addrman.h.

constexpr uint8_t CAddrMan::INCOMPATIBILITY_BASE = 32

staticprivate

The initial value of a field that is incremented every time an incompatible format change is made (such that old software versions would not be able to parse and understand the new file format).

This is 32 because we overtook the "key size" field which was 32 historically.

Note: Don't increment this. Increment lowest_compatible in Serialize() instead.

Definition at line 200 of file addrman.h.

FastRandomContext CAddrMan::insecure_rand

protected

Source of random numbers for randomization in inner loops.

Definition at line 237 of file addrman.h.

std::vector<bool> CAddrMan::m_asmap

Definition at line 305 of file addrman.h.

std::set<int> CAddrMan::m_tried_collisions

private

Holds addrs inserted into tried table that collide with existing entries. Test-before-evict discipline used to resolve these collisions.

Definition at line 230 of file addrman.h.

uint256 CAddrMan::nKey

protected

secret key to randomize bucket select with

Definition at line 234 of file addrman.h.

The documentation for this class was generated from the following files:

src/addrman.h
src/addrman.cpp

Public Member Functions

Static Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Private Types

Private Member Functions

Private Attributes

Static Private Attributes

Friends

Detailed Description

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation

Friends And Related Function Documentation

Member Data Documentation