63 lines
1.5 KiB
Go
63 lines
1.5 KiB
Go
package rpc
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import (
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"fmt"
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"math"
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"strings"
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"github.com/ethereum/go-ethereum/common/hexutil"
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)
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// BlockNumber represents decoding hex string to block values
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type BlockNumber int64
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const (
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// LatestBlockNumber mapping from "latest" to 0 for tm query
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LatestBlockNumber = BlockNumber(0)
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// EarliestBlockNumber mapping from "earliest" to 1 for tm query (earliest query not supported)
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EarliestBlockNumber = BlockNumber(1)
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)
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// UnmarshalJSON parses the given JSON fragment into a BlockNumber. It supports:
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// - "latest", "earliest" or "pending" as string arguments
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// - the block number
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// Returned errors:
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// - an invalid block number error when the given argument isn't a known strings
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// - an out of range error when the given block number is either too little or too large
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func (bn *BlockNumber) UnmarshalJSON(data []byte) error {
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input := strings.TrimSpace(string(data))
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if len(input) >= 2 && input[0] == '"' && input[len(input)-1] == '"' {
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input = input[1 : len(input)-1]
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}
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switch input {
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case "earliest":
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*bn = EarliestBlockNumber
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return nil
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case "latest":
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*bn = LatestBlockNumber
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return nil
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case "pending":
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return fmt.Errorf("pending queries not implemented")
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// *bn = PendingBlockNumber
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// return nil
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}
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blckNum, err := hexutil.DecodeUint64(input)
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if err != nil {
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return err
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}
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if blckNum > math.MaxInt64 {
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return fmt.Errorf("Blocknumber too high")
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}
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*bn = BlockNumber(blckNum)
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return nil
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}
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// Int64 converts block number to primitive type
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func (bn BlockNumber) Int64() int64 {
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return (int64)(bn)
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}
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