diff options
Diffstat (limited to 'src/addrman.h')
| -rw-r--r-- | src/addrman.h | 374 |
1 files changed, 39 insertions, 335 deletions
diff --git a/src/addrman.h b/src/addrman.h index 7dd8528bef..174ab4f811 100644 --- a/src/addrman.h +++ b/src/addrman.h @@ -6,94 +6,22 @@ #ifndef BITCOIN_ADDRMAN_H #define BITCOIN_ADDRMAN_H -#include <fs.h> -#include <logging.h> #include <netaddress.h> #include <protocol.h> -#include <sync.h> +#include <streams.h> #include <timedata.h> #include <cstdint> +#include <memory> #include <optional> -#include <set> -#include <unordered_map> +#include <utility> #include <vector> +class AddrManImpl; + /** Default for -checkaddrman */ static constexpr int32_t DEFAULT_ADDRMAN_CONSISTENCY_CHECKS{0}; -/** - * Extended statistics about a CAddress - */ -class CAddrInfo : public CAddress -{ -public: - //! last try whatsoever by us (memory only) - int64_t nLastTry{0}; - - //! last counted attempt (memory only) - int64_t nLastCountAttempt{0}; - -private: - //! where knowledge about this address first came from - CNetAddr source; - - //! last successful connection by us - int64_t nLastSuccess{0}; - - //! connection attempts since last successful attempt - int nAttempts{0}; - - //! reference count in new sets (memory only) - int nRefCount{0}; - - //! in tried set? (memory only) - bool fInTried{false}; - - //! position in vRandom - mutable int nRandomPos{-1}; - - friend class CAddrMan; - friend class CAddrManDeterministic; - -public: - - SERIALIZE_METHODS(CAddrInfo, obj) - { - READWRITEAS(CAddress, obj); - READWRITE(obj.source, obj.nLastSuccess, obj.nAttempts); - } - - CAddrInfo(const CAddress &addrIn, const CNetAddr &addrSource) : CAddress(addrIn), source(addrSource) - { - } - - CAddrInfo() : CAddress(), source() - { - } - - //! Calculate in which "tried" bucket this entry belongs - int GetTriedBucket(const uint256 &nKey, const std::vector<bool> &asmap) const; - - //! Calculate in which "new" bucket this entry belongs, given a certain source - int GetNewBucket(const uint256 &nKey, const CNetAddr& src, const std::vector<bool> &asmap) const; - - //! Calculate in which "new" bucket this entry belongs, using its default source - int GetNewBucket(const uint256 &nKey, const std::vector<bool> &asmap) const - { - return GetNewBucket(nKey, source, asmap); - } - - //! Calculate in which position of a bucket to store this entry. - int GetBucketPosition(const uint256 &nKey, bool fNew, int nBucket) const; - - //! Determine whether the statistics about this entry are bad enough so that it can just be deleted - bool IsTerrible(int64_t nNow = GetAdjustedTime()) const; - - //! Calculate the relative chance this entry should be given when selecting nodes to connect to - double GetChance(int64_t nNow = GetAdjustedTime()) const; -}; - /** Stochastic address manager * * Design goals: @@ -123,290 +51,64 @@ public: * * Several indexes are kept for high performance. Setting m_consistency_check_ratio with the -checkaddrman * configuration option will introduce (expensive) consistency checks for the entire data structure. */ +class AddrMan +{ + const std::unique_ptr<AddrManImpl> m_impl; -/** Total number of buckets for tried addresses */ -static constexpr int32_t ADDRMAN_TRIED_BUCKET_COUNT_LOG2{8}; -static constexpr int ADDRMAN_TRIED_BUCKET_COUNT{1 << ADDRMAN_TRIED_BUCKET_COUNT_LOG2}; - -/** Total number of buckets for new addresses */ -static constexpr int32_t ADDRMAN_NEW_BUCKET_COUNT_LOG2{10}; -static constexpr int ADDRMAN_NEW_BUCKET_COUNT{1 << ADDRMAN_NEW_BUCKET_COUNT_LOG2}; +public: + explicit AddrMan(std::vector<bool> asmap, bool deterministic, int32_t consistency_check_ratio); -/** Maximum allowed number of entries in buckets for new and tried addresses */ -static constexpr int32_t ADDRMAN_BUCKET_SIZE_LOG2{6}; -static constexpr int ADDRMAN_BUCKET_SIZE{1 << ADDRMAN_BUCKET_SIZE_LOG2}; + ~AddrMan(); -/** - * Stochastical (IP) address manager - */ -class CAddrMan -{ -public: template <typename Stream> - void Serialize(Stream& s_) const EXCLUSIVE_LOCKS_REQUIRED(!cs); + void Serialize(Stream& s_) const; template <typename Stream> - void Unserialize(Stream& s_) EXCLUSIVE_LOCKS_REQUIRED(!cs); - - explicit CAddrMan(std::vector<bool> asmap, bool deterministic, int32_t consistency_check_ratio); - - ~CAddrMan() - { - nKey.SetNull(); - } + void Unserialize(Stream& s_); //! Return the number of (unique) addresses in all tables. - size_t size() const - EXCLUSIVE_LOCKS_REQUIRED(!cs) - { - LOCK(cs); // TODO: Cache this in an atomic to avoid this overhead - return vRandom.size(); - } + size_t size() const; //! Add addresses to addrman's new table. - bool Add(const std::vector<CAddress> &vAddr, const CNetAddr& source, int64_t nTimePenalty = 0) - EXCLUSIVE_LOCKS_REQUIRED(!cs) - { - LOCK(cs); - int nAdd = 0; - Check(); - for (std::vector<CAddress>::const_iterator it = vAddr.begin(); it != vAddr.end(); it++) - nAdd += Add_(*it, source, nTimePenalty) ? 1 : 0; - Check(); - if (nAdd) { - LogPrint(BCLog::ADDRMAN, "Added %i addresses from %s: %i tried, %i new\n", nAdd, source.ToString(), nTried, nNew); - } - return nAdd > 0; - } + bool Add(const std::vector<CAddress>& vAddr, const CNetAddr& source, int64_t nTimePenalty = 0); - //! Mark an entry as accessible. - void Good(const CService &addr, int64_t nTime = GetAdjustedTime()) - EXCLUSIVE_LOCKS_REQUIRED(!cs) - { - LOCK(cs); - Check(); - Good_(addr, /* test_before_evict */ true, nTime); - Check(); - } + //! Mark an entry as accessible, possibly moving it from "new" to "tried". + void Good(const CService& addr, int64_t nTime = GetAdjustedTime()); //! Mark an entry as connection attempted to. - void Attempt(const CService &addr, bool fCountFailure, int64_t nTime = GetAdjustedTime()) - EXCLUSIVE_LOCKS_REQUIRED(!cs) - { - LOCK(cs); - Check(); - Attempt_(addr, fCountFailure, nTime); - Check(); - } + void Attempt(const CService& addr, bool fCountFailure, int64_t nTime = GetAdjustedTime()); //! See if any to-be-evicted tried table entries have been tested and if so resolve the collisions. - void ResolveCollisions() - EXCLUSIVE_LOCKS_REQUIRED(!cs) - { - LOCK(cs); - Check(); - ResolveCollisions_(); - Check(); - } - - //! Randomly select an address in tried that another address is attempting to evict. - CAddrInfo SelectTriedCollision() - EXCLUSIVE_LOCKS_REQUIRED(!cs) - { - LOCK(cs); - Check(); - const CAddrInfo ret = SelectTriedCollision_(); - Check(); - return ret; - } + void ResolveCollisions(); /** - * Choose an address to connect to. + * Randomly select an address in the tried table that another address is + * attempting to evict. + * + * @return CAddress The record for the selected tried peer. + * int64_t The last time we attempted to connect to that peer. */ - CAddrInfo Select(bool newOnly = false) const - EXCLUSIVE_LOCKS_REQUIRED(!cs) - { - LOCK(cs); - Check(); - const CAddrInfo addrRet = Select_(newOnly); - Check(); - return addrRet; - } + std::pair<CAddress, int64_t> SelectTriedCollision(); /** - * Return all or many randomly selected addresses, optionally by network. + * Choose an address to connect to. * - * @param[in] max_addresses Maximum number of addresses to return (0 = all). - * @param[in] max_pct Maximum percentage of addresses to return (0 = all). - * @param[in] network Select only addresses of this network (nullopt = all). + * @param[in] newOnly Whether to only select addresses from the new table. + * @return CAddress The record for the selected peer. + * int64_t The last time we attempted to connect to that peer. */ - std::vector<CAddress> GetAddr(size_t max_addresses, size_t max_pct, std::optional<Network> network) const - EXCLUSIVE_LOCKS_REQUIRED(!cs) - { - LOCK(cs); - Check(); - std::vector<CAddress> vAddr; - GetAddr_(vAddr, max_addresses, max_pct, network); - Check(); - return vAddr; - } - - //! Outer function for Connected_() - void Connected(const CService &addr, int64_t nTime = GetAdjustedTime()) - EXCLUSIVE_LOCKS_REQUIRED(!cs) - { - LOCK(cs); - Check(); - Connected_(addr, nTime); - Check(); - } - - void SetServices(const CService &addr, ServiceFlags nServices) - EXCLUSIVE_LOCKS_REQUIRED(!cs) - { - LOCK(cs); - Check(); - SetServices_(addr, nServices); - Check(); - } - - const std::vector<bool>& GetAsmap() const { return m_asmap; } - -private: - //! A mutex to protect the inner data structures. - mutable Mutex cs; - - //! Source of random numbers for randomization in inner loops - mutable FastRandomContext insecure_rand GUARDED_BY(cs); - - //! secret key to randomize bucket select with - uint256 nKey; - - //! Serialization versions. - enum Format : uint8_t { - V0_HISTORICAL = 0, //!< historic format, before commit e6b343d88 - V1_DETERMINISTIC = 1, //!< for pre-asmap files - V2_ASMAP = 2, //!< for files including asmap version - V3_BIP155 = 3, //!< same as V2_ASMAP plus addresses are in BIP155 format - }; - - //! 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. - static constexpr Format FILE_FORMAT = Format::V3_BIP155; - - //! 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. - static constexpr uint8_t INCOMPATIBILITY_BASE = 32; - - //! last used nId - int nIdCount GUARDED_BY(cs){0}; - - //! table with information about all nIds - std::unordered_map<int, CAddrInfo> mapInfo GUARDED_BY(cs); - - //! find an nId based on its network address - std::unordered_map<CNetAddr, int, CNetAddrHash> mapAddr GUARDED_BY(cs); - - //! randomly-ordered vector of all nIds - //! This is mutable because it is unobservable outside the class, so any - //! changes to it (even in const methods) are also unobservable. - mutable std::vector<int> vRandom GUARDED_BY(cs); - - // number of "tried" entries - int nTried GUARDED_BY(cs){0}; - - //! list of "tried" buckets - int vvTried[ADDRMAN_TRIED_BUCKET_COUNT][ADDRMAN_BUCKET_SIZE] GUARDED_BY(cs); - - //! number of (unique) "new" entries - int nNew GUARDED_BY(cs){0}; - - //! list of "new" buckets - int vvNew[ADDRMAN_NEW_BUCKET_COUNT][ADDRMAN_BUCKET_SIZE] GUARDED_BY(cs); - - //! last time Good was called (memory only). Initially set to 1 so that "never" is strictly worse. - int64_t nLastGood GUARDED_BY(cs){1}; - - //! Holds addrs inserted into tried table that collide with existing entries. Test-before-evict discipline used to resolve these collisions. - std::set<int> m_tried_collisions; - - /** Perform consistency checks every m_consistency_check_ratio operations (if non-zero). */ - const int32_t m_consistency_check_ratio; - - // Compressed IP->ASN mapping, loaded from a file when a node starts. - // Should be always empty if no file was provided. - // This mapping is then used for bucketing nodes in Addrman. - // - // If asmap is provided, nodes will be bucketed by - // AS they belong to, in order to make impossible for a node - // to connect to several nodes hosted in a single AS. - // This is done in response to Erebus attack, but also to generally - // diversify the connections every node creates, - // especially useful when a large fraction of nodes - // operate under a couple of cloud providers. - // - // If a new asmap was provided, the existing records - // would be re-bucketed accordingly. - const std::vector<bool> m_asmap; - - //! Find an entry. - CAddrInfo* Find(const CNetAddr& addr, int *pnId = nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs); - - //! Create a new entry and add it to the internal data structures mapInfo, mapAddr and vRandom. - CAddrInfo* Create(const CAddress &addr, const CNetAddr &addrSource, int *pnId = nullptr) EXCLUSIVE_LOCKS_REQUIRED(cs); - - //! Swap two elements in vRandom. - void SwapRandom(unsigned int nRandomPos1, unsigned int nRandomPos2) const EXCLUSIVE_LOCKS_REQUIRED(cs); - - //! Move an entry from the "new" table(s) to the "tried" table - void MakeTried(CAddrInfo& info, int nId) EXCLUSIVE_LOCKS_REQUIRED(cs); - - //! Delete an entry. It must not be in tried, and have refcount 0. - void Delete(int nId) EXCLUSIVE_LOCKS_REQUIRED(cs); - - //! Clear a position in a "new" table. This is the only place where entries are actually deleted. - void ClearNew(int nUBucket, int nUBucketPos) EXCLUSIVE_LOCKS_REQUIRED(cs); - - //! Mark an entry "good", possibly moving it from "new" to "tried". - void Good_(const CService &addr, bool test_before_evict, int64_t time) EXCLUSIVE_LOCKS_REQUIRED(cs); - - //! Add an entry to the "new" table. - bool Add_(const CAddress &addr, const CNetAddr& source, int64_t nTimePenalty) EXCLUSIVE_LOCKS_REQUIRED(cs); - - //! Mark an entry as attempted to connect. - void Attempt_(const CService &addr, bool fCountFailure, int64_t nTime) EXCLUSIVE_LOCKS_REQUIRED(cs); - - //! Select an address to connect to, if newOnly is set to true, only the new table is selected from. - CAddrInfo Select_(bool newOnly) const EXCLUSIVE_LOCKS_REQUIRED(cs); - - //! See if any to-be-evicted tried table entries have been tested and if so resolve the collisions. - void ResolveCollisions_() EXCLUSIVE_LOCKS_REQUIRED(cs); - - //! Return a random to-be-evicted tried table address. - CAddrInfo SelectTriedCollision_() EXCLUSIVE_LOCKS_REQUIRED(cs); - - //! Consistency check, taking into account m_consistency_check_ratio. Will std::abort if an inconsistency is detected. - void Check() const EXCLUSIVE_LOCKS_REQUIRED(cs); - - //! Perform consistency check, regardless of m_consistency_check_ratio. - //! @returns an error code or zero. - int ForceCheckAddrman() const EXCLUSIVE_LOCKS_REQUIRED(cs); + std::pair<CAddress, int64_t> Select(bool newOnly = false) const; /** * Return all or many randomly selected addresses, optionally by network. * - * @param[out] vAddr Vector of randomly selected addresses from vRandom. * @param[in] max_addresses Maximum number of addresses to return (0 = all). * @param[in] max_pct Maximum percentage of addresses to return (0 = all). * @param[in] network Select only addresses of this network (nullopt = all). + * + * @return A vector of randomly selected addresses from vRandom. */ - void GetAddr_(std::vector<CAddress>& vAddr, size_t max_addresses, size_t max_pct, std::optional<Network> network) const EXCLUSIVE_LOCKS_REQUIRED(cs); + std::vector<CAddress> GetAddr(size_t max_addresses, size_t max_pct, std::optional<Network> network) const; /** We have successfully connected to this peer. Calling this function * updates the CAddress's nTime, which is used in our IsTerrible() @@ -419,13 +121,15 @@ private: * @param[in] addr The address of the peer we were connected to * @param[in] nTime The time that we were last connected to this peer */ - void Connected_(const CService& addr, int64_t nTime) EXCLUSIVE_LOCKS_REQUIRED(cs); + void Connected(const CService& addr, int64_t nTime = GetAdjustedTime()); //! Update an entry's service bits. - void SetServices_(const CService &addr, ServiceFlags nServices) EXCLUSIVE_LOCKS_REQUIRED(cs); + void SetServices(const CService& addr, ServiceFlags nServices); + + const std::vector<bool>& GetAsmap() const; - friend class CAddrManTest; - friend class CAddrManDeterministic; + friend class AddrManTest; + friend class AddrManDeterministic; }; #endif // BITCOIN_ADDRMAN_H |