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ACP-77: Implement ids.ID#Append #3518

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merged 3 commits into from
Nov 5, 2024
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ACP-77: Implement ids.ID#Append #3518

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cf1a0c5
ACP-77: Implement ids.ID#Append
StephenButtolph Nov 5, 2024
1b35878
update doc
StephenButtolph Nov 5, 2024
df99701
Merge branch 'master' into implement-acp-77-id-suffix
StephenButtolph Nov 5, 2024
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16 changes: 16 additions & 0 deletions ids/id.go
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Original file line number Diff line number Diff line change
Expand Up @@ -107,6 +107,22 @@ func (id ID) Prefix(prefixes ...uint64) ID {
return hashing.ComputeHash256Array(packer.Bytes)
}

// Append this id to create a more selective id.
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//
// This is used to generate the ACP-77 validationIDs.
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func (id ID) Append(suffixes ...uint32) ID {
packer := wrappers.Packer{
Bytes: make([]byte, IDLen+len(suffixes)*wrappers.IntLen),
}

packer.PackFixedBytes(id[:])
for _, suffix := range suffixes {
packer.PackInt(suffix)
}

return hashing.ComputeHash256Array(packer.Bytes)
}

// XOR this id and the provided id and return the resulting id.
//
// Note: this id is not modified.
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86 changes: 86 additions & 0 deletions ids/id_test.go
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Expand Up @@ -6,12 +6,14 @@ package ids
import (
"encoding/json"
"fmt"
"slices"
"testing"

"github.com/stretchr/testify/require"

"github.com/ava-labs/avalanchego/utils"
"github.com/ava-labs/avalanchego/utils/cb58"
"github.com/ava-labs/avalanchego/utils/hashing"
)

func TestID(t *testing.T) {
Expand All @@ -25,6 +27,90 @@ func TestID(t *testing.T) {
require.Equal(prefixed, id.Prefix(0))
}

func TestIDPrefix(t *testing.T) {
id := GenerateTestID()
tests := []struct {
name string
id ID
prefix []uint64
expectedPreimage []byte
}{
{
name: "empty prefix",
id: id,
prefix: []uint64{},
expectedPreimage: id[:],
},
{
name: "1 prefix",
id: id,
prefix: []uint64{1},
expectedPreimage: slices.Concat(
[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01},
id[:],
),
},
{
name: "multiple prefixes",
id: id,
prefix: []uint64{1, 256},
expectedPreimage: slices.Concat(
[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01},
[]byte{0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00},
id[:],
),
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
expected := ID(hashing.ComputeHash256Array(test.expectedPreimage))
require.Equal(t, expected, test.id.Prefix(test.prefix...))
})
}
}

func TestIDAppend(t *testing.T) {
id := GenerateTestID()
tests := []struct {
name string
id ID
suffix []uint32
expectedPreimage []byte
}{
{
name: "empty suffix",
id: id,
suffix: []uint32{},
expectedPreimage: id[:],
},
{
name: "1 suffix",
id: id,
suffix: []uint32{1},
expectedPreimage: slices.Concat(
id[:],
[]byte{0x00, 0x00, 0x00, 0x01},
),
},
{
name: "multiple suffixes",
id: id,
suffix: []uint32{1, 256},
expectedPreimage: slices.Concat(
id[:],
[]byte{0x00, 0x00, 0x00, 0x01},
[]byte{0x00, 0x00, 0x01, 0x00},
),
},
}
for _, test := range tests {
t.Run(test.name, func(t *testing.T) {
expected := ID(hashing.ComputeHash256Array(test.expectedPreimage))
require.Equal(t, expected, test.id.Append(test.suffix...))
})
}
}

func TestIDXOR(t *testing.T) {
require := require.New(t)

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