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package types
import (
abci "github.com/tendermint/tendermint/abci/types"
"github.com/tendermint/tendermint/crypto/tmhash"
cmn "github.com/tendermint/tendermint/libs/common"
)
const (
// MaxBlockSizeBytes is the maximum permitted size of the blocks.
MaxBlockSizeBytes = 104857600 // 100MB
// BlockPartSizeBytes is the size of one block part.
BlockPartSizeBytes = 65536 // 64kB
)
// ConsensusParams contains consensus critical parameters that determine the
// validity of blocks.
type ConsensusParams struct {
BlockSize `json:"block_size_params"`
EvidenceParams `json:"evidence_params"`
}
// BlockSize contain limits on the block size.
type BlockSize struct {
MaxBytes int64 `json:"max_bytes"`
MaxGas int64 `json:"max_gas"`
}
// EvidenceParams determine how we handle evidence of malfeasance
type EvidenceParams struct {
MaxAge int64 `json:"max_age"` // only accept new evidence more recent than this
}
// DefaultConsensusParams returns a default ConsensusParams.
func DefaultConsensusParams() *ConsensusParams {
return &ConsensusParams{
DefaultBlockSize(),
DefaultEvidenceParams(),
}
}
// DefaultBlockSize returns a default BlockSize.
func DefaultBlockSize() BlockSize {
return BlockSize{
MaxBytes: 22020096, // 21MB
MaxGas: -1,
}
}
// DefaultEvidenceParams Params returns a default EvidenceParams.
func DefaultEvidenceParams() EvidenceParams {
return EvidenceParams{
MaxAge: 100000, // 27.8 hrs at 1block/s
}
}
// Validate validates the ConsensusParams to ensure all values are within their
// allowed limits, and returns an error if they are not.
func (params *ConsensusParams) Validate() error {
if params.BlockSize.MaxBytes <= 0 {
return cmn.NewError("BlockSize.MaxBytes must be greater than 0. Got %d",
params.BlockSize.MaxBytes)
}
if params.BlockSize.MaxBytes > MaxBlockSizeBytes {
return cmn.NewError("BlockSize.MaxBytes is too big. %d > %d",
params.BlockSize.MaxBytes, MaxBlockSizeBytes)
}
if params.BlockSize.MaxGas < -1 {
return cmn.NewError("BlockSize.MaxGas must be greater or equal to -1. Got %d",
params.BlockSize.MaxGas)
}
if params.EvidenceParams.MaxAge <= 0 {
return cmn.NewError("EvidenceParams.MaxAge must be greater than 0. Got %d",
params.EvidenceParams.MaxAge)
}
return nil
}
// Hash returns a hash of the parameters to store in the block header
// No Merkle tree here, only three values are hashed here
// thus benefit from saving space < drawbacks from proofs' overhead
// Revisit this function if new fields are added to ConsensusParams
func (params *ConsensusParams) Hash() []byte {
hasher := tmhash.New()
bz := cdcEncode(params)
if bz == nil {
panic("cannot fail to encode ConsensusParams")
}
hasher.Write(bz)
return hasher.Sum(nil)
}
// Update returns a copy of the params with updates from the non-zero fields of p2.
// NOTE: note: must not modify the original
func (params ConsensusParams) Update(params2 *abci.ConsensusParams) ConsensusParams {
res := params // explicit copy
if params2 == nil {
return res
}
// we must defensively consider any structs may be nil
if params2.BlockSize != nil {
res.BlockSize.MaxBytes = params2.BlockSize.MaxBytes
res.BlockSize.MaxGas = params2.BlockSize.MaxGas
}
if params2.EvidenceParams != nil {
res.EvidenceParams.MaxAge = params2.EvidenceParams.MaxAge
}
return res
}