feat(chain): Chain struct with block storage and retrieval
Co-Authored-By: Charon <charon@lethean.io>
This commit is contained in:
Claude
parent
8cb5cb4ad2
commit
d5976d33c3
5 changed files with 357 additions and 1 deletions
47
chain/chain.go
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47
chain/chain.go
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// Copyright (c) 2017-2026 Lethean (https://lt.hn)
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//
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// Licensed under the European Union Public Licence (EUPL) version 1.2.
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// SPDX-License-Identifier: EUPL-1.2
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// Package chain stores and indexes the Lethean blockchain by syncing from
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// a C++ daemon via RPC.
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package chain
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import (
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"fmt"
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store "forge.lthn.ai/core/go-store"
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"forge.lthn.ai/core/go-blockchain/types"
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)
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// Chain manages blockchain storage and indexing.
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type Chain struct {
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store *store.Store
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}
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// New creates a Chain backed by the given store.
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func New(s *store.Store) *Chain {
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return &Chain{store: s}
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}
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// Height returns the number of stored blocks (0 if empty).
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func (c *Chain) Height() (uint64, error) {
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n, err := c.store.Count(groupBlocks)
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if err != nil {
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return 0, fmt.Errorf("chain: height: %w", err)
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}
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return uint64(n), nil
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}
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// TopBlock returns the highest stored block and its metadata.
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// Returns an error if the chain is empty.
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func (c *Chain) TopBlock() (*types.Block, *BlockMeta, error) {
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h, err := c.Height()
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if err != nil {
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return nil, nil, err
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}
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if h == 0 {
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return nil, nil, fmt.Errorf("chain: no blocks stored")
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}
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return c.GetBlockByHeight(h - 1)
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}
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131
chain/chain_test.go
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131
chain/chain_test.go
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@ -0,0 +1,131 @@
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// Copyright (c) 2017-2026 Lethean (https://lt.hn)
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//
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// Licensed under the European Union Public Licence (EUPL) version 1.2.
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// SPDX-License-Identifier: EUPL-1.2
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package chain
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import (
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"testing"
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store "forge.lthn.ai/core/go-store"
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"forge.lthn.ai/core/go-blockchain/types"
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"forge.lthn.ai/core/go-blockchain/wire"
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)
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func newTestChain(t *testing.T) *Chain {
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t.Helper()
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s, err := store.New(":memory:")
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if err != nil {
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t.Fatalf("store.New: %v", err)
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}
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t.Cleanup(func() { s.Close() })
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return New(s)
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}
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// testCoinbaseTx returns a minimal v1 coinbase transaction that round-trips
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// cleanly through the wire encoder/decoder.
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func testCoinbaseTx(height uint64) types.Transaction {
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return types.Transaction{
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Version: 1,
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Vin: []types.TxInput{types.TxInputGenesis{Height: height}},
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Vout: []types.TxOutput{types.TxOutputBare{
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Amount: 1000000,
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Target: types.TxOutToKey{Key: types.PublicKey{0x01}},
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}},
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Extra: wire.EncodeVarint(0),
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Attachment: wire.EncodeVarint(0),
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}
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}
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func TestChain_Height_Empty(t *testing.T) {
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c := newTestChain(t)
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h, err := c.Height()
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if err != nil {
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t.Fatalf("Height: %v", err)
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}
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if h != 0 {
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t.Errorf("height: got %d, want 0", h)
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}
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}
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func TestChain_PutGetBlock_Good(t *testing.T) {
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c := newTestChain(t)
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blk := &types.Block{
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BlockHeader: types.BlockHeader{
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MajorVersion: 1,
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Timestamp: 1770897600,
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},
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MinerTx: testCoinbaseTx(0),
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}
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meta := &BlockMeta{
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Hash: types.Hash{0xab, 0xcd},
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Height: 0,
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Timestamp: 1770897600,
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Difficulty: 1,
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}
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if err := c.PutBlock(blk, meta); err != nil {
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t.Fatalf("PutBlock: %v", err)
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}
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h, err := c.Height()
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if err != nil {
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t.Fatalf("Height: %v", err)
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}
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if h != 1 {
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t.Errorf("height: got %d, want 1", h)
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}
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gotBlk, gotMeta, err := c.GetBlockByHeight(0)
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if err != nil {
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t.Fatalf("GetBlockByHeight: %v", err)
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}
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if gotBlk.MajorVersion != 1 {
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t.Errorf("major_version: got %d, want 1", gotBlk.MajorVersion)
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}
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if gotMeta.Hash != meta.Hash {
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t.Errorf("hash mismatch")
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}
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gotBlk2, gotMeta2, err := c.GetBlockByHash(meta.Hash)
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if err != nil {
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t.Fatalf("GetBlockByHash: %v", err)
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}
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if gotBlk2.Timestamp != blk.Timestamp {
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t.Errorf("timestamp mismatch")
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}
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if gotMeta2.Height != 0 {
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t.Errorf("height: got %d, want 0", gotMeta2.Height)
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}
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}
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func TestChain_TopBlock_Good(t *testing.T) {
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c := newTestChain(t)
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for i := uint64(0); i < 3; i++ {
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blk := &types.Block{
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BlockHeader: types.BlockHeader{
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MajorVersion: 1,
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Timestamp: 1770897600 + i*120,
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},
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MinerTx: testCoinbaseTx(i),
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}
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meta := &BlockMeta{
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Hash: types.Hash{byte(i)},
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Height: i,
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}
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if err := c.PutBlock(blk, meta); err != nil {
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t.Fatalf("PutBlock(%d): %v", i, err)
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}
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}
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_, topMeta, err := c.TopBlock()
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if err != nil {
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t.Fatalf("TopBlock: %v", err)
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}
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if topMeta.Height != 2 {
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t.Errorf("top height: got %d, want 2", topMeta.Height)
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}
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}
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115
chain/store.go
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115
chain/store.go
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@ -0,0 +1,115 @@
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// Copyright (c) 2017-2026 Lethean (https://lt.hn)
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//
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// Licensed under the European Union Public Licence (EUPL) version 1.2.
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// SPDX-License-Identifier: EUPL-1.2
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package chain
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import (
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"bytes"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"strconv"
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store "forge.lthn.ai/core/go-store"
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"forge.lthn.ai/core/go-blockchain/types"
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"forge.lthn.ai/core/go-blockchain/wire"
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)
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// Storage group constants matching the design schema.
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const (
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groupBlocks = "blocks"
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groupBlockIndex = "block_index"
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groupTx = "transactions"
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groupSpentKeys = "spent_keys"
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groupOutputsPfx = "outputs:" // suffixed with amount
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)
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// heightKey returns a zero-padded 10-digit decimal key for the given height.
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func heightKey(h uint64) string {
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return fmt.Sprintf("%010d", h)
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}
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// blockRecord is the JSON value stored in the blocks group.
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type blockRecord struct {
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Meta BlockMeta `json:"meta"`
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Blob string `json:"blob"` // hex-encoded wire format
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}
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// PutBlock stores a block and updates the block_index.
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func (c *Chain) PutBlock(b *types.Block, meta *BlockMeta) error {
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var buf bytes.Buffer
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enc := wire.NewEncoder(&buf)
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wire.EncodeBlock(enc, b)
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if err := enc.Err(); err != nil {
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return fmt.Errorf("chain: encode block %d: %w", meta.Height, err)
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}
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rec := blockRecord{
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Meta: *meta,
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Blob: hex.EncodeToString(buf.Bytes()),
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}
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val, err := json.Marshal(rec)
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if err != nil {
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return fmt.Errorf("chain: marshal block %d: %w", meta.Height, err)
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}
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if err := c.store.Set(groupBlocks, heightKey(meta.Height), string(val)); err != nil {
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return fmt.Errorf("chain: store block %d: %w", meta.Height, err)
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}
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// Update hash -> height index.
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hashHex := meta.Hash.String()
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if err := c.store.Set(groupBlockIndex, hashHex, strconv.FormatUint(meta.Height, 10)); err != nil {
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return fmt.Errorf("chain: index block %d: %w", meta.Height, err)
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}
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return nil
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}
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// GetBlockByHeight retrieves a block by its height.
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func (c *Chain) GetBlockByHeight(height uint64) (*types.Block, *BlockMeta, error) {
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val, err := c.store.Get(groupBlocks, heightKey(height))
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if err != nil {
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if errors.Is(err, store.ErrNotFound) {
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return nil, nil, fmt.Errorf("chain: block %d not found", height)
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}
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return nil, nil, fmt.Errorf("chain: get block %d: %w", height, err)
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}
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return decodeBlockRecord(val)
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}
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// GetBlockByHash retrieves a block by its hash.
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func (c *Chain) GetBlockByHash(hash types.Hash) (*types.Block, *BlockMeta, error) {
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heightStr, err := c.store.Get(groupBlockIndex, hash.String())
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if err != nil {
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if errors.Is(err, store.ErrNotFound) {
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return nil, nil, fmt.Errorf("chain: block %s not found", hash)
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}
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return nil, nil, fmt.Errorf("chain: get block index %s: %w", hash, err)
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}
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height, err := strconv.ParseUint(heightStr, 10, 64)
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if err != nil {
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return nil, nil, fmt.Errorf("chain: parse height %q: %w", heightStr, err)
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}
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return c.GetBlockByHeight(height)
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}
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func decodeBlockRecord(val string) (*types.Block, *BlockMeta, error) {
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var rec blockRecord
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if err := json.Unmarshal([]byte(val), &rec); err != nil {
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return nil, nil, fmt.Errorf("chain: unmarshal block: %w", err)
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}
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blob, err := hex.DecodeString(rec.Blob)
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if err != nil {
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return nil, nil, fmt.Errorf("chain: decode block hex: %w", err)
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}
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dec := wire.NewDecoder(bytes.NewReader(blob))
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blk := wire.DecodeBlock(dec)
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if err := dec.Err(); err != nil {
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return nil, nil, fmt.Errorf("chain: decode block wire: %w", err)
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}
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return &blk, &rec.Meta, nil
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}
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14
go.mod
14
go.mod
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@ -8,7 +8,19 @@ require (
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golang.org/x/crypto v0.48.0
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)
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require golang.org/x/sys v0.41.0 // indirect
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require (
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github.com/dustin/go-humanize v1.0.1 // indirect
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github.com/google/uuid v1.6.0 // indirect
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github.com/mattn/go-isatty v0.0.20 // indirect
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github.com/ncruces/go-strftime v1.0.0 // indirect
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github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
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golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 // indirect
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golang.org/x/sys v0.41.0 // indirect
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modernc.org/libc v1.67.6 // indirect
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modernc.org/mathutil v1.7.1 // indirect
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modernc.org/memory v1.11.0 // indirect
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modernc.org/sqlite v1.46.1 // indirect
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)
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replace forge.lthn.ai/core/go-p2p => /home/claude/Code/core/go-p2p
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51
go.sum
51
go.sum
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@ -1,12 +1,63 @@
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github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
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github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
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github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
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github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e h1:ijClszYn+mADRFY17kjQEVQ1XRhq2/JR1M3sGqeJoxs=
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github.com/google/pprof v0.0.0-20250317173921-a4b03ec1a45e/go.mod h1:boTsfXsheKC2y+lKOCMpSfarhxDeIzfZG1jqGcPl3cA=
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github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
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github.com/google/uuid v1.6.0/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
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github.com/hashicorp/golang-lru/v2 v2.0.7 h1:a+bsQ5rvGLjzHuww6tVxozPZFVghXaHOwFs4luLUK2k=
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github.com/hashicorp/golang-lru/v2 v2.0.7/go.mod h1:QeFd9opnmA6QUJc5vARoKUSoFhyfM2/ZepoAG6RGpeM=
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github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
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github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
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github.com/ncruces/go-strftime v1.0.0 h1:HMFp8mLCTPp341M/ZnA4qaf7ZlsbTc+miZjCLOFAw7w=
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github.com/ncruces/go-strftime v1.0.0/go.mod h1:Fwc5htZGVVkseilnfgOVb9mKy6w1naJmn9CehxcKcls=
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github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec h1:W09IVJc94icq4NjY3clb7Lk8O1qJ8BdBEF8z0ibU0rE=
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github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
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github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
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github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
|
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golang.org/x/crypto v0.48.0 h1:/VRzVqiRSggnhY7gNRxPauEQ5Drw9haKdM0jqfcCFts=
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golang.org/x/crypto v0.48.0/go.mod h1:r0kV5h3qnFPlQnBSrULhlsRfryS2pmewsg+XfMgkVos=
|
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golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546 h1:mgKeJMpvi0yx/sU5GsxQ7p6s2wtOnGAHZWCHUM4KGzY=
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golang.org/x/exp v0.0.0-20251023183803-a4bb9ffd2546/go.mod h1:j/pmGrbnkbPtQfxEe5D0VQhZC6qKbfKifgD0oM7sR70=
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golang.org/x/mod v0.29.0 h1:HV8lRxZC4l2cr3Zq1LvtOsi/ThTgWnUk/y64QSs8GwA=
|
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golang.org/x/mod v0.29.0/go.mod h1:NyhrlYXJ2H4eJiRy/WDBO6HMqZQ6q9nk4JzS3NuCK+w=
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golang.org/x/sync v0.17.0 h1:l60nONMj9l5drqw6jlhIELNv9I0A4OFgRsG9k2oT9Ug=
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golang.org/x/sync v0.17.0/go.mod h1:9KTHXmSnoGruLpwFjVSX0lNNA75CykiMECbovNTZqGI=
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golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
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golang.org/x/sys v0.41.0 h1:Ivj+2Cp/ylzLiEU89QhWblYnOE9zerudt9Ftecq2C6k=
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golang.org/x/sys v0.41.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
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golang.org/x/tools v0.38.0 h1:Hx2Xv8hISq8Lm16jvBZ2VQf+RLmbd7wVUsALibYI/IQ=
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golang.org/x/tools v0.38.0/go.mod h1:yEsQ/d/YK8cjh0L6rZlY8tgtlKiBNTL14pGDJPJpYQs=
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gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
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gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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modernc.org/cc/v4 v4.27.1 h1:9W30zRlYrefrDV2JE2O8VDtJ1yPGownxciz5rrbQZis=
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modernc.org/cc/v4 v4.27.1/go.mod h1:uVtb5OGqUKpoLWhqwNQo/8LwvoiEBLvZXIQ/SmO6mL0=
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modernc.org/ccgo/v4 v4.30.1 h1:4r4U1J6Fhj98NKfSjnPUN7Ze2c6MnAdL0hWw6+LrJpc=
|
||||
modernc.org/ccgo/v4 v4.30.1/go.mod h1:bIOeI1JL54Utlxn+LwrFyjCx2n2RDiYEaJVSrgdrRfM=
|
||||
modernc.org/fileutil v1.3.40 h1:ZGMswMNc9JOCrcrakF1HrvmergNLAmxOPjizirpfqBA=
|
||||
modernc.org/fileutil v1.3.40/go.mod h1:HxmghZSZVAz/LXcMNwZPA/DRrQZEVP9VX0V4LQGQFOc=
|
||||
modernc.org/gc/v2 v2.6.5 h1:nyqdV8q46KvTpZlsw66kWqwXRHdjIlJOhG6kxiV/9xI=
|
||||
modernc.org/gc/v2 v2.6.5/go.mod h1:YgIahr1ypgfe7chRuJi2gD7DBQiKSLMPgBQe9oIiito=
|
||||
modernc.org/gc/v3 v3.1.1 h1:k8T3gkXWY9sEiytKhcgyiZ2L0DTyCQ/nvX+LoCljoRE=
|
||||
modernc.org/gc/v3 v3.1.1/go.mod h1:HFK/6AGESC7Ex+EZJhJ2Gni6cTaYpSMmU/cT9RmlfYY=
|
||||
modernc.org/goabi0 v0.2.0 h1:HvEowk7LxcPd0eq6mVOAEMai46V+i7Jrj13t4AzuNks=
|
||||
modernc.org/goabi0 v0.2.0/go.mod h1:CEFRnnJhKvWT1c1JTI3Avm+tgOWbkOu5oPA8eH8LnMI=
|
||||
modernc.org/libc v1.67.6 h1:eVOQvpModVLKOdT+LvBPjdQqfrZq+pC39BygcT+E7OI=
|
||||
modernc.org/libc v1.67.6/go.mod h1:JAhxUVlolfYDErnwiqaLvUqc8nfb2r6S6slAgZOnaiE=
|
||||
modernc.org/mathutil v1.7.1 h1:GCZVGXdaN8gTqB1Mf/usp1Y/hSqgI2vAGGP4jZMCxOU=
|
||||
modernc.org/mathutil v1.7.1/go.mod h1:4p5IwJITfppl0G4sUEDtCr4DthTaT47/N3aT6MhfgJg=
|
||||
modernc.org/memory v1.11.0 h1:o4QC8aMQzmcwCK3t3Ux/ZHmwFPzE6hf2Y5LbkRs+hbI=
|
||||
modernc.org/memory v1.11.0/go.mod h1:/JP4VbVC+K5sU2wZi9bHoq2MAkCnrt2r98UGeSK7Mjw=
|
||||
modernc.org/opt v0.1.4 h1:2kNGMRiUjrp4LcaPuLY2PzUfqM/w9N23quVwhKt5Qm8=
|
||||
modernc.org/opt v0.1.4/go.mod h1:03fq9lsNfvkYSfxrfUhZCWPk1lm4cq4N+Bh//bEtgns=
|
||||
modernc.org/sortutil v1.2.1 h1:+xyoGf15mM3NMlPDnFqrteY07klSFxLElE2PVuWIJ7w=
|
||||
modernc.org/sortutil v1.2.1/go.mod h1:7ZI3a3REbai7gzCLcotuw9AC4VZVpYMjDzETGsSMqJE=
|
||||
modernc.org/sqlite v1.46.1 h1:eFJ2ShBLIEnUWlLy12raN0Z1plqmFX9Qe3rjQTKt6sU=
|
||||
modernc.org/sqlite v1.46.1/go.mod h1:CzbrU2lSB1DKUusvwGz7rqEKIq+NUd8GWuBBZDs9/nA=
|
||||
modernc.org/strutil v1.2.1 h1:UneZBkQA+DX2Rp35KcM69cSsNES9ly8mQWD71HKlOA0=
|
||||
modernc.org/strutil v1.2.1/go.mod h1:EHkiggD70koQxjVdSBM3JKM7k6L0FbGE5eymy9i3B9A=
|
||||
modernc.org/token v1.1.0 h1:Xl7Ap9dKaEs5kLoOQeQmPWevfnk/DM5qcLcYlA8ys6Y=
|
||||
modernc.org/token v1.1.0/go.mod h1:UGzOrNV1mAFSEB63lOFHIpNRUVMvYTc6yu1SMY/XTDM=
|
||||
|
|
|
|||
Loading…
Add table
Reference in a new issue