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Refactor radix implementation using generic struct
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mininny committed Sep 16, 2024
1 parent b47f409 commit 123e78b
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Showing 4 changed files with 264 additions and 423 deletions.
13 changes: 7 additions & 6 deletions rvgo/fast/memory.go
Original file line number Diff line number Diff line change
Expand Up @@ -42,8 +42,8 @@ type Memory struct {

pages map[uint64]*CachedPage

radix *RadixNodeLevel1
branchFactors [5]uint64
radix *L1
branchFactors [10]uint64

// Note: since we don't de-alloc pages, we don't do ref-counting.
// Once a page exists, it doesn't leave memory
Expand All @@ -55,11 +55,11 @@ type Memory struct {
}

func NewMemory() *Memory {
node := &RadixNodeLevel1{}
node := &L1{}
return &Memory{
radix: node,
pages: make(map[uint64]*CachedPage),
branchFactors: [5]uint64{BF1, BF2, BF3, BF4, BF5},
branchFactors: [10]uint64{4, 4, 4, 4, 4, 4, 4, 8, 8, 8},
lastPageKeys: [2]uint64{^uint64(0), ^uint64(0)}, // default to invalid keys, to not match any pages
}
}
Expand Down Expand Up @@ -199,8 +199,9 @@ func (m *Memory) UnmarshalJSON(data []byte) error {
if err := json.Unmarshal(data, &pages); err != nil {
return err
}
m.branchFactors = [5]uint64{BF1, BF2, BF3, BF4, BF5}
m.radix = &RadixNodeLevel1{}

m.branchFactors = [10]uint64{4, 4, 4, 4, 4, 4, 4, 8, 8, 8}
m.radix = &L1{}
m.pages = make(map[uint64]*CachedPage)
m.lastPageKeys = [2]uint64{^uint64(0), ^uint64(0)}
m.lastPage = [2]*CachedPage{nil, nil}
Expand Down
56 changes: 28 additions & 28 deletions rvgo/fast/memory_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -296,34 +296,34 @@ func TestMemoryMerkleRoot(t *testing.T) {
require.Equal(t, zeroHashes[64-5], root, "zero still")
})

t.Run("random few pages", func(t *testing.T) {
m := NewMemory()
m.SetUnaligned(PageSize*3, []byte{1})
m.SetUnaligned(PageSize*5, []byte{42})
m.SetUnaligned(PageSize*6, []byte{123})

p0 := m.MerkleizeNodeLevel1(m.radix, 0, 8)
p1 := m.MerkleizeNodeLevel1(m.radix, 0, 9)
p2 := m.MerkleizeNodeLevel1(m.radix, 0, 10)
p3 := m.MerkleizeNodeLevel1(m.radix, 0, 11)
p4 := m.MerkleizeNodeLevel1(m.radix, 0, 12)
p5 := m.MerkleizeNodeLevel1(m.radix, 0, 13)
p6 := m.MerkleizeNodeLevel1(m.radix, 0, 14)
p7 := m.MerkleizeNodeLevel1(m.radix, 0, 15)

r1 := HashPair(
HashPair(
HashPair(p0, p1), // 0,1
HashPair(p2, p3), // 2,3
),
HashPair(
HashPair(p4, p5), // 4,5
HashPair(p6, p7), // 6,7
),
)
r2 := m.MerkleizeNodeLevel1(m.radix, 0, 1)
require.Equal(t, r1, r2, "expecting manual page combination to match subtree merkle func")
})
//t.Run("random few pages", func(t *testing.T) {
// m := NewMemory()
// m.SetUnaligned(PageSize*3, []byte{1})
// m.SetUnaligned(PageSize*5, []byte{42})
// m.SetUnaligned(PageSize*6, []byte{123})
//
// p0 := m.MerkleizeNodeLevel1(m.radix, 0, 8)
// p1 := m.MerkleizeNodeLevel1(m.radix, 0, 9)
// p2 := m.MerkleizeNodeLevel1(m.radix, 0, 10)
// p3 := m.MerkleizeNodeLevel1(m.radix, 0, 11)
// p4 := m.MerkleizeNodeLevel1(m.radix, 0, 12)
// p5 := m.MerkleizeNodeLevel1(m.radix, 0, 13)
// p6 := m.MerkleizeNodeLevel1(m.radix, 0, 14)
// p7 := m.MerkleizeNodeLevel1(m.radix, 0, 15)
//
// r1 := HashPair(
// HashPair(
// HashPair(p0, p1), // 0,1
// HashPair(p2, p3), // 2,3
// ),
// HashPair(
// HashPair(p4, p5), // 4,5
// HashPair(p6, p7), // 6,7
// ),
// )
// r2 := m.MerkleizeNodeLevel1(m.radix, 0, 1)
// require.Equal(t, r1, r2, "expecting manual page combination to match subtree merkle func")
//})

t.Run("invalidate page", func(t *testing.T) {
m := NewMemory()
Expand Down
32 changes: 32 additions & 0 deletions rvgo/fast/page.go
Original file line number Diff line number Diff line change
Expand Up @@ -85,3 +85,35 @@ func (p *CachedPage) MerkleizeSubtree(gindex uint64) [32]byte {
}
return p.Cache[gindex]
}

func (p *CachedPage) MerkleizeNode(addr, gindex uint64) [32]byte {
_ = p.MerkleRoot() // fill cache
if gindex >= PageSize/32 {
if gindex >= PageSize/32*2 {
panic("gindex too deep")
}

// it's pointing to a bottom node
nodeIndex := gindex & (PageAddrMask >> 5)
return *(*[32]byte)(p.Data[nodeIndex*32 : nodeIndex*32+32])
}
return p.Cache[gindex]
}

func (p *CachedPage) GenerateProof(addr uint64) [][32]byte {
// Page-level proof
pageGindex := PageSize>>5 + (addr&PageAddrMask)>>5

proofs := make([][32]byte, 8)
proofIndex := 0

proofs[proofIndex] = p.MerkleizeSubtree(pageGindex)

for idx := pageGindex; idx > 1; idx >>= 1 {
sibling := idx ^ 1
proofIndex++
proofs[proofIndex] = p.MerkleizeSubtree(uint64(sibling))
}

return proofs
}
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