1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52

// Copyright (C) 2019-2023 Aleo Systems Inc.
// This file is part of the snarkOS library.

// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
// http://www.apache.org/licenses/LICENSE-2.0

// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

use snarkos_node_messages::{BlockLocators, CHECKPOINT_INTERVAL, NUM_RECENTS};
use snarkvm::prelude::{store::ConsensusStorage, Ledger, Network};

use anyhow::Result;
use indexmap::IndexMap;

/// Returns the block locators for the given ledger.
pub fn get_block_locators<N: Network, C: ConsensusStorage<N>>(ledger: &Ledger<N, C>) -> Result<BlockLocators<N>> {
    // Retrieve the latest height.
    let latest_height = ledger.latest_height();

    // Initialize the recents map.
    let mut recents = IndexMap::with_capacity(NUM_RECENTS);

    // Retrieve the recent block hashes.
    for height in latest_height.saturating_sub((NUM_RECENTS - 1) as u32)..=latest_height {
        recents.insert(height, ledger.get_hash(height)?);
    }

    // Initialize the checkpoints map.
    let mut checkpoints = IndexMap::with_capacity((latest_height / CHECKPOINT_INTERVAL + 1).try_into()?);

    // Retrieve the checkpoint block hashes.
    for height in (0..=latest_height).step_by(CHECKPOINT_INTERVAL as usize) {
        checkpoints.insert(height, ledger.get_hash(height)?);
    }

    // Construct the block locators.
    Ok(BlockLocators::new(recents, checkpoints))
}

/// A helper to log instructions to recover.
pub fn log_clean_error(dev: Option<u16>) {
    match dev {
        Some(id) => error!("Storage corruption detected! Run `snarkos clean --dev {id}` to reset storage"),
        None => error!("Storage corruption detected! Run `snarkos clean` to reset storage"),
    }
}