/
block.go
178 lines (157 loc) · 4.23 KB
/
block.go
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package types
import (
"encoding/json"
"errors"
"fmt"
"math"
"math/big"
"strings"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
)
// BlockNumber represents decoding hex string to block values
type BlockNumber int64
const (
// LatestBlockNumber mapping from "latest" to 0 for tm query
LatestBlockNumber = BlockNumber(0)
// EarliestBlockNumber mapping from "earliest" to 1 for tm query (earliest query not supported)
EarliestBlockNumber = BlockNumber(1)
// PendingBlockNumber mapping from "pending" to -1 for tm query
PendingBlockNumber = BlockNumber(-1)
)
var ErrResourceNotFound = errors.New("resource not found")
// NewBlockNumber creates a new BlockNumber instance.
func NewBlockNumber(n *big.Int) BlockNumber {
return BlockNumber(n.Int64())
}
// UnmarshalJSON parses the given JSON fragment into a BlockNumber. It supports:
// - "latest", "earliest" or "pending" as string arguments
// - the block number
// Returned errors:
// - an invalid block number error when the given argument isn't a known strings
// - an out of range error when the given block number is either too little or too large
func (bn *BlockNumber) UnmarshalJSON(data []byte) error {
input := strings.TrimSpace(string(data))
if len(input) >= 2 && input[0] == '"' && input[len(input)-1] == '"' {
input = input[1 : len(input)-1]
}
switch input {
case "earliest":
*bn = EarliestBlockNumber
return nil
case "latest":
*bn = LatestBlockNumber
return nil
case "pending":
*bn = PendingBlockNumber
return nil
}
blckNum, err := hexutil.DecodeUint64(input)
if err != nil {
return err
}
if blckNum > math.MaxInt64 {
return fmt.Errorf("blocknumber too high")
}
*bn = BlockNumber(blckNum)
return nil
}
// Int64 converts block number to primitive type
func (bn BlockNumber) Int64() int64 {
return int64(bn)
}
// TmHeight is a util function used for the Tendermint RPC client. It returns
// nil if the block number is "latest". Otherwise, it returns the pointer of the
// int64 value of the height.
func (bn BlockNumber) TmHeight() *int64 {
if bn == LatestBlockNumber {
return nil
}
height := bn.Int64()
return &height
}
type BlockNumberOrHash struct {
BlockNumber *BlockNumber `json:"blockNumber,omitempty"`
BlockHash *common.Hash `json:"blockHash,omitempty"`
RequireCanonical bool `json:"requireCanonical,omitempty"`
}
func (bnh *BlockNumberOrHash) UnmarshalJSON(data []byte) error {
type erased BlockNumberOrHash
e := erased{}
err := json.Unmarshal(data, &e)
if err == nil {
if e.BlockNumber != nil && e.BlockHash != nil {
return fmt.Errorf("cannot specify both BlockHash and BlockNumber, choose one or the other")
}
bnh.BlockNumber = e.BlockNumber
bnh.BlockHash = e.BlockHash
bnh.RequireCanonical = e.RequireCanonical
return nil
}
var input string
err = json.Unmarshal(data, &input)
if err != nil {
return err
}
switch input {
case "earliest":
bn := EarliestBlockNumber
bnh.BlockNumber = &bn
return nil
case "latest":
bn := LatestBlockNumber
bnh.BlockNumber = &bn
return nil
case "pending":
bn := PendingBlockNumber
bnh.BlockNumber = &bn
return nil
default:
if len(input) == 66 {
hash := common.Hash{}
err := hash.UnmarshalText([]byte(input))
if err != nil {
return err
}
bnh.BlockHash = &hash
return nil
} else {
blckNum, err := hexutil.DecodeUint64(input)
if err != nil {
return err
}
if blckNum > math.MaxInt64 {
return fmt.Errorf("blocknumber too high")
}
bn := BlockNumber(blckNum)
bnh.BlockNumber = &bn
return nil
}
}
}
func (bnh *BlockNumberOrHash) Number() (BlockNumber, bool) {
if bnh.BlockNumber != nil {
return *bnh.BlockNumber, true
}
return BlockNumber(0), false
}
func (bnh *BlockNumberOrHash) Hash() (common.Hash, bool) {
if bnh.BlockHash != nil {
return *bnh.BlockHash, true
}
return common.Hash{}, false
}
func BlockNumberOrHashWithNumber(blockNr BlockNumber) BlockNumberOrHash {
return BlockNumberOrHash{
BlockNumber: &blockNr,
BlockHash: nil,
RequireCanonical: false,
}
}
func BlockNumberOrHashWithHash(hash common.Hash, canonical bool) BlockNumberOrHash {
return BlockNumberOrHash{
BlockNumber: nil,
BlockHash: &hash,
RequireCanonical: canonical,
}
}