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feat: Allow for truncation of 0x prefix hashes #61

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feat: Allow for truncation of 0x prefix hashes #61

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e654fb9
fix: allow for bytes to be truncated down
SamMayWork Mar 7, 2024
bf9149f
fix: remove truncation error
SamMayWork May 10, 2024
2b549f3
style: update copyright messages
SamMayWork May 10, 2024
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10 changes: 9 additions & 1 deletion pkg/ethtypes/hexbytes.go
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Copyright © 2022 Kaleido, Inc.
// Copyright © 2024 Kaleido, Inc.
//
// SPDX-License-Identifier: Apache-2.0
//
Expand Down Expand Up @@ -62,6 +62,14 @@ func (h HexBytes0xPrefix) MarshalJSON() ([]byte, error) {
return []byte(fmt.Sprintf(`"%s"`, h.String())), nil
}

func (h HexBytes0xPrefix) Truncate(length int) HexBytes0xPrefix {
if length > len(h) {
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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?

return h
}

return h[:length]
}

func NewHexBytes0xPrefix(s string) (HexBytes0xPrefix, error) {
h, err := hex.DecodeString(strings.TrimPrefix(s, "0x"))
if err != nil {
Expand Down
35 changes: 35 additions & 0 deletions pkg/ethtypes/hexbytes_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -90,3 +90,38 @@ func TestHexByteConstructors(t *testing.T) {
MustNewHexBytes0xPrefix("!wrong")
})
}

func TestHexBytesTruncation(t *testing.T) {
testStruct := struct {
H1 HexBytes0xPrefix `json:"h1"`
H2 HexBytes0xPrefix `json:"h2"`
H3 HexBytes0xPrefix `json:"h3"`
H4 HexBytes0xPrefix `json:"h4"`
}{}

testData := `{
"h1": "0x34d2e4fef9de99a2688148de11174741d1399992f261dcd6ff019211a91eda748dcef26338e992f4df60b8dee3fdd28a",
"h2": "0x34d2e4fef9de99a2688148de11174741d1399992f261dcd6ff019211a91eda74",
"h3": "0x34d2e4fef9",
"h4": "0x34d2e4fef9de99a2688148de11174741d1399992f261dcd6ff019211a91eda748dcef26338e992"
}`

err := json.Unmarshal([]byte(testData), &testStruct)
assert.NoError(t, err)

result := testStruct.H1.Truncate(32)
testStruct.H1 = result

result = testStruct.H2.Truncate(32)
testStruct.H2 = result

result = testStruct.H3.Truncate(32)

result = testStruct.H4.Truncate(32)
testStruct.H4 = result

assert.Equal(t, "0x34d2e4fef9de99a2688148de11174741d1399992f261dcd6ff019211a91eda74", testStruct.H1.String())
assert.Equal(t, "0x34d2e4fef9de99a2688148de11174741d1399992f261dcd6ff019211a91eda74", testStruct.H2.String())
assert.Equal(t, "0x34d2e4fef9", testStruct.H3.String())
assert.Equal(t, "0x34d2e4fef9de99a2688148de11174741d1399992f261dcd6ff019211a91eda74", testStruct.H4.String())
}
2 changes: 1 addition & 1 deletion pkg/ethtypes/hexinteger_test.go
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Copyright © 2022 Kaleido, Inc.
// Copyright © 2024 Kaleido, Inc.
//
// SPDX-License-Identifier: Apache-2.0
//
Expand Down
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