neoneo-go/pkg/config/protocol_config.go

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package config
import (
"errors"
"fmt"
"sort"
"github.com/nspcc-dev/neo-go/pkg/config/netmode"
"github.com/nspcc-dev/neo-go/pkg/core/native/nativenames"
"github.com/nspcc-dev/neo-go/pkg/encoding/fixedn"
)
// ProtocolConfiguration represents the protocol config.
type (
ProtocolConfiguration struct {
// CommitteeHistory stores committee size change history (height: size).
CommitteeHistory map[uint32]int `yaml:"CommitteeHistory"`
// GarbageCollectionPeriod sets the number of blocks to wait before
// starting the next MPT garbage collection cycle when RemoveUntraceableBlocks
// option is used.
GarbageCollectionPeriod uint32 `yaml:"GarbageCollectionPeriod"`
Magic netmode.Magic `yaml:"Magic"`
MemPoolSize int `yaml:"MemPoolSize"`
// InitialGASSupply is the amount of GAS generated in the genesis block.
InitialGASSupply fixedn.Fixed8 `yaml:"InitialGASSupply"`
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// P2PNotaryRequestPayloadPoolSize specifies the memory pool size for P2PNotaryRequestPayloads.
// It is valid only if P2PSigExtensions are enabled.
P2PNotaryRequestPayloadPoolSize int `yaml:"P2PNotaryRequestPayloadPoolSize"`
// KeepOnlyLatestState specifies if MPT should only store the latest state.
// If true, DB size will be smaller, but older roots won't be accessible.
// This value should remain the same for the same database.
KeepOnlyLatestState bool `yaml:"KeepOnlyLatestState"`
// RemoveUntraceableBlocks specifies if old data should be removed.
RemoveUntraceableBlocks bool `yaml:"RemoveUntraceableBlocks"`
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// MaxBlockSize is the maximum block size in bytes.
MaxBlockSize uint32 `yaml:"MaxBlockSize"`
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// MaxBlockSystemFee is the maximum overall system fee per block.
MaxBlockSystemFee int64 `yaml:"MaxBlockSystemFee"`
// MaxTraceableBlocks is the length of the chain accessible to smart contracts.
MaxTraceableBlocks uint32 `yaml:"MaxTraceableBlocks"`
// MaxTransactionsPerBlock is the maximum amount of transactions per block.
MaxTransactionsPerBlock uint16 `yaml:"MaxTransactionsPerBlock"`
// MaxValidUntilBlockIncrement is the upper increment size of blockchain height in blocks
// exceeding that a transaction should fail validation. It is set to estimated daily number
// of blocks with 15s interval.
MaxValidUntilBlockIncrement uint32 `yaml:"MaxValidUntilBlockIncrement"`
// NativeUpdateHistories is a list of histories of native contracts updates.
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NativeUpdateHistories map[string][]uint32 `yaml:"NativeActivations"`
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// P2PSigExtensions enables additional signature-related logic.
P2PSigExtensions bool `yaml:"P2PSigExtensions"`
// P2PStateExchangeExtensions enables additional P2P MPT state data exchange logic.
P2PStateExchangeExtensions bool `yaml:"P2PStateExchangeExtensions"`
// ReservedAttributes allows to have reserved attributes range for experimental or private purposes.
ReservedAttributes bool `yaml:"ReservedAttributes"`
// SaveStorageBatch enables storage batch saving before every persist.
SaveStorageBatch bool `yaml:"SaveStorageBatch"`
SecondsPerBlock int `yaml:"SecondsPerBlock"`
SeedList []string `yaml:"SeedList"`
StandbyCommittee []string `yaml:"StandbyCommittee"`
// StateRooInHeader enables storing state root in block header.
StateRootInHeader bool `yaml:"StateRootInHeader"`
// StateSyncInterval is the number of blocks between state heights available for MPT state data synchronization.
// It is valid only if P2PStateExchangeExtensions are enabled.
StateSyncInterval int `yaml:"StateSyncInterval"`
ValidatorsCount int `yaml:"ValidatorsCount"`
// Validators stores history of changes to consensus node number (height: number).
ValidatorsHistory map[uint32]int `yaml:"ValidatorsHistory"`
// Whether to verify received blocks.
VerifyBlocks bool `yaml:"VerifyBlocks"`
// Whether to verify transactions in the received blocks.
VerifyTransactions bool `yaml:"VerifyTransactions"`
}
)
// heightNumber is an auxiliary structure for configuration checks.
type heightNumber struct {
h uint32
n int
}
// Validate checks ProtocolConfiguration for internal consistency and returns
// an error if anything inappropriate found. Other methods can rely on protocol
// validity after this.
func (p *ProtocolConfiguration) Validate() error {
var err error
if p.KeepOnlyLatestState && p.P2PStateExchangeExtensions {
return errors.New("can't have both KeepOnlyLatestState and P2PStateExchangeExtensions")
}
for name := range p.NativeUpdateHistories {
if !nativenames.IsValid(name) {
return fmt.Errorf("NativeActivations configuration section contains unexpected native contract name: %s", name)
}
}
if p.ValidatorsCount != 0 && len(p.ValidatorsHistory) != 0 {
return errors.New("configuration should either have ValidatorsCount or ValidatorsHistory, not both")
}
if len(p.StandbyCommittee) < p.ValidatorsCount {
return errors.New("validators count can't exceed the size of StandbyCommittee")
}
var arr = make([]heightNumber, 0, len(p.CommitteeHistory))
for h, n := range p.CommitteeHistory {
if int(n) > len(p.StandbyCommittee) {
return fmt.Errorf("too small StandbyCommittee for required number of committee members at %d", h)
}
arr = append(arr, heightNumber{h, n})
}
if len(arr) != 0 {
err = sortCheckZero(arr, "CommitteeHistory")
if err != nil {
return err
}
for i, hn := range arr[1:] {
if int64(hn.h)%int64(hn.n) != 0 || int64(hn.h)%int64(arr[i].n) != 0 {
return fmt.Errorf("invalid CommitteeHistory: bad %d height for %d and %d committee", hn.h, hn.n, arr[i].n)
}
}
}
arr = arr[:0]
for h, n := range p.ValidatorsHistory {
if int(n) > len(p.StandbyCommittee) {
return fmt.Errorf("too small StandbyCommittee for required number of validators at %d", h)
}
arr = append(arr, heightNumber{h, n})
}
if len(arr) != 0 {
err = sortCheckZero(arr, "ValidatorsHistory")
if err != nil {
return err
}
for _, hn := range arr {
if int64(hn.n) > int64(p.GetCommitteeSize(hn.h)) {
return fmt.Errorf("requested number of validators is too big: %d at %d", hn.n, hn.h)
}
if int64(hn.h)%int64(p.GetCommitteeSize(hn.h)) != 0 {
return fmt.Errorf("validators number change is not aligned with committee change at %d", hn.h)
}
}
}
return nil
}
// sortCheckZero sorts heightNumber array and checks for zero height presence.
func sortCheckZero(arr []heightNumber, field string) error {
sort.Slice(arr, func(i, j int) bool {
return arr[i].h < arr[j].h
})
if arr[0].h != 0 {
return fmt.Errorf("invalid %s: no height 0 specified", field)
}
return nil
}
// GetCommitteeSize returns the committee size for the given height. It implies
// valid configuration file.
func (p *ProtocolConfiguration) GetCommitteeSize(height uint32) int {
if len(p.CommitteeHistory) == 0 {
return len(p.StandbyCommittee)
}
return getBestFromMap(p.CommitteeHistory, height)
}
func getBestFromMap(dict map[uint32]int, height uint32) int {
var res int
var bestH = uint32(0)
for h, n := range dict {
if h >= bestH && h <= height {
res = n
bestH = h
}
}
return res
}
// GetNumOfCNs returns the number of validators for the given height.
// It implies valid configuration file.
func (p *ProtocolConfiguration) GetNumOfCNs(height uint32) int {
if len(p.ValidatorsHistory) == 0 {
return p.ValidatorsCount
}
return getBestFromMap(p.ValidatorsHistory, height)
}
// ShouldUpdateCommitteeAt answers the question of whether the committee
// should be updated at the given height.
func (p *ProtocolConfiguration) ShouldUpdateCommitteeAt(height uint32) bool {
return height%uint32(p.GetCommitteeSize(height)) == 0
}