feat: Allow for truncation of 0x prefix hashes #61
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Signed-off-by: SamMayWork <sam.may@kaleido.io>
SamMayWork
changed the title
pkg/ethtypes/hexbytes.go
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| @@ -62,6 +62,14 @@ func (h HexBytes0xPrefix) MarshalJSON() ([]byte, error) { | |||
| return []byte(fmt.Sprintf(`"%s"`, h.String())), nil | |||
| } | |||
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| func (h HexBytes0xPrefix) Truncate(length int) (HexBytes0xPrefix, error) { | |||
| if length > len(h) { | |||
| return nil, fmt.Errorf("truncation length %d larger than length of hex bytes", length) | |||
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It's not a common behaviour that truncates throws an error when the length is smaller than the truncate size.
It seems the truncate size conveys the constraint of minSize implicitly, may worth thinking making that explicit?
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Agree - changed the logic here to return the original hex bytes if the length of the bytes is less than the desired length
Signed-off-by: SamMayWork <sam.may@kaleido.io>
Signed-off-by: SamMayWork <sam.may@kaleido.io>
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@SamMayWork - could do with a little explanation of why firefly-signer common utility functions are the right place for []byte truncation functions?
| @@ -62,6 +62,14 @@ func (h HexBytes0xPrefix) MarshalJSON() ([]byte, error) { | |||
| return []byte(fmt.Sprintf(`"%s"`, h.String())), nil | |||
| } | |||
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| func (h HexBytes0xPrefix) Truncate(length int) HexBytes0xPrefix { | |||
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I'm not sure what this PR does sorry @SamMayWork
It seems like this is just a bytes manipulation function - surely that could just be done directly by the calling function?
Why is this a helper that is unique to the HexBytes0xPrefix type wrapper for String() formatting?
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Not required. |
Pre-Reqs: hyperledger/firefly-evmconnect#118
Hedera uses 48 bytes hashes for their blocks, for compatibility with FireFly we need to truncate down to 32 bytes - this is an entirely supported feature of the JSON RPC layer for Hedera, this PR adds the function for us to be able to do this.