47 lines
1.1 KiB
Go
47 lines
1.1 KiB
Go
// Copyright (c) 2017-2026 Lethean (https://lt.hn)
|
|
//
|
|
// Licensed under the European Union Public Licence (EUPL) version 1.2.
|
|
// SPDX-License-Identifier: EUPL-1.2
|
|
|
|
// Package chain stores and indexes the Lethean blockchain by syncing from
|
|
// a C++ daemon via RPC.
|
|
package chain
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
store "forge.lthn.ai/core/go-store"
|
|
"forge.lthn.ai/core/go-blockchain/types"
|
|
)
|
|
|
|
// Chain manages blockchain storage and indexing.
|
|
type Chain struct {
|
|
store *store.Store
|
|
}
|
|
|
|
// New creates a Chain backed by the given store.
|
|
func New(s *store.Store) *Chain {
|
|
return &Chain{store: s}
|
|
}
|
|
|
|
// Height returns the number of stored blocks (0 if empty).
|
|
func (c *Chain) Height() (uint64, error) {
|
|
n, err := c.store.Count(groupBlocks)
|
|
if err != nil {
|
|
return 0, fmt.Errorf("chain: height: %w", err)
|
|
}
|
|
return uint64(n), nil
|
|
}
|
|
|
|
// TopBlock returns the highest stored block and its metadata.
|
|
// Returns an error if the chain is empty.
|
|
func (c *Chain) TopBlock() (*types.Block, *BlockMeta, error) {
|
|
h, err := c.Height()
|
|
if err != nil {
|
|
return nil, nil, err
|
|
}
|
|
if h == 0 {
|
|
return nil, nil, fmt.Errorf("chain: no blocks stored")
|
|
}
|
|
return c.GetBlockByHeight(h - 1)
|
|
}
|