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Test heartbeat service, restrict free heartbeats
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| // Copyright (C) 2019-2024 Algorand, Inc. | ||
| // This file is part of go-algorand | ||
| // | ||
| // go-algorand is free software: you can redistribute it and/or modify | ||
| // it under the terms of the GNU Affero General Public License as | ||
| // published by the Free Software Foundation, either version 3 of the | ||
| // License, or (at your option) any later version. | ||
| // | ||
| // go-algorand is distributed in the hope that it will be useful, | ||
| // but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| // GNU Affero General Public License for more details. | ||
| // | ||
| // You should have received a copy of the GNU Affero General Public License | ||
| // along with go-algorand. If not, see <https://www.gnu.org/licenses/>. | ||
|
|
||
| package apply | ||
|
|
||
| import ( | ||
| "math/bits" | ||
|
|
||
| "github.com/algorand/go-algorand/config" | ||
| "github.com/algorand/go-algorand/data/basics" | ||
| "github.com/algorand/go-algorand/data/bookkeeping" | ||
| "github.com/algorand/go-algorand/data/committee" | ||
| ) | ||
|
|
||
| // ChallengePeriod indicates which part of the challenge period is under discussion. | ||
| type ChallengePeriod int | ||
|
|
||
| const ( | ||
| // ChRisky indicates that a challenge is in effect, and the initial grace period is running out. | ||
| ChRisky ChallengePeriod = iota | ||
| // ChActive indicates that a challenege is in effect, and the grace period | ||
| // has run out, so accounts can be suspended | ||
| ChActive | ||
| ) | ||
|
|
||
| type challenge struct { | ||
| // round is when the challenge occurred. 0 means this is not a challenge. | ||
| round basics.Round | ||
| // accounts that match the first `bits` of `seed` must propose or heartbeat to stay online | ||
| seed committee.Seed | ||
| bits int | ||
| } | ||
|
|
||
| type headerSource interface { | ||
| BlockHdr(round basics.Round) (bookkeeping.BlockHeader, error) | ||
| } | ||
|
|
||
| // FindChallenge returns the Challenge that was last issued if it's in the period requested. | ||
| func FindChallenge(rules config.ProposerPayoutRules, current basics.Round, headers headerSource, period ChallengePeriod) challenge { | ||
| // are challenges active? | ||
| interval := basics.Round(rules.ChallengeInterval) | ||
| if rules.ChallengeInterval == 0 || current < interval { | ||
| return challenge{} | ||
| } | ||
| lastChallenge := current - (current % interval) | ||
| grace := basics.Round(rules.ChallengeGracePeriod) | ||
| // FindChallenge is structured this way, instead of returning the challenge | ||
| // and letting the caller determine the period it cares about, to avoid | ||
| // using BlockHdr unnecessarily. | ||
| switch period { | ||
| case ChRisky: | ||
| if current <= lastChallenge+grace/2 || current > lastChallenge+grace { | ||
| return challenge{} | ||
| } | ||
| case ChActive: | ||
| if current <= lastChallenge+grace || current > lastChallenge+2*grace { | ||
| return challenge{} | ||
| } | ||
| } | ||
| challengeHdr, err := headers.BlockHdr(lastChallenge) | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| challengeProto := config.Consensus[challengeHdr.CurrentProtocol] | ||
| // challenge is not considered if rules have changed since that round | ||
| if challengeProto.Payouts != rules { | ||
| return challenge{} | ||
| } | ||
| return challenge{lastChallenge, challengeHdr.Seed, rules.ChallengeBits} | ||
| } | ||
|
|
||
| // IsZero returns true if the challenge is empty (used to indicate no challenege) | ||
| func (ch challenge) IsZero() bool { | ||
| return ch == challenge{} | ||
| } | ||
|
|
||
| // Failed returns true iff ch is in effect, matches address, and lastSeen is | ||
| // before the challenge issue. | ||
| func (ch challenge) Failed(address basics.Address, lastSeen basics.Round) bool { | ||
| return ch.round != 0 && bitsMatch(ch.seed[:], address[:], ch.bits) && lastSeen < ch.round | ||
| } | ||
|
|
||
| // bitsMatch checks if the first n bits of two byte slices match. Written to | ||
| // work on arbitrary slices, but we expect that n is small. Only user today | ||
| // calls with n=5. | ||
| func bitsMatch(a, b []byte, n int) bool { | ||
| // Ensure n is a valid number of bits to compare | ||
| if n < 0 || n > len(a)*8 || n > len(b)*8 { | ||
| return false | ||
| } | ||
|
|
||
| // Compare entire bytes when n is bigger than 8 | ||
| for i := 0; i < n/8; i++ { | ||
| if a[i] != b[i] { | ||
| return false | ||
| } | ||
| } | ||
| remaining := n % 8 | ||
| if remaining == 0 { | ||
| return true | ||
| } | ||
| return bits.LeadingZeros8(a[n/8]^b[n/8]) >= remaining | ||
| } | ||
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