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// Copyright (c) 2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_NODE_CHAINSTATE_H
#define BITCOIN_NODE_CHAINSTATE_H
#include <cstdint> // for int64_t
#include <optional> // for std::optional
class ArgsManager;
class CChainParams;
class ChainstateManager;
struct NodeContext;
enum class ChainstateLoadingError {
ERROR_LOADING_BLOCK_DB,
ERROR_BAD_GENESIS_BLOCK,
ERROR_PRUNED_NEEDS_REINDEX,
ERROR_LOAD_GENESIS_BLOCK_FAILED,
ERROR_CHAINSTATE_UPGRADE_FAILED,
ERROR_REPLAYBLOCKS_FAILED,
ERROR_LOADCHAINTIP_FAILED,
ERROR_GENERIC_BLOCKDB_OPEN_FAILED,
ERROR_BLOCKS_WITNESS_INSUFFICIENTLY_VALIDATED,
ERROR_BLOCK_FROM_FUTURE,
ERROR_CORRUPTED_BLOCK_DB,
SHUTDOWN_PROBED,
};
/** This sequence can have 4 types of outcomes:
*
* 1. Success
* 2. Shutdown requested
* - nothing failed but a shutdown was triggered in the middle of the
* sequence
* 3. Soft failure
* - a failure that might be recovered from with a reindex
* 4. Hard failure
* - a failure that definitively cannot be recovered from with a reindex
*
* Currently, LoadChainstate returns a std::optional<ChainstateLoadingError>
* which:
*
* - if has_value()
* - Either "Soft failure", "Hard failure", or "Shutdown requested",
* differentiable by the specific enumerator.
*
* Note that a return value of SHUTDOWN_PROBED means ONLY that "during
* this sequence, when we explicitly checked ShutdownRequested() at
* arbitrary points, one of those calls returned true". Therefore, a
* return value other than SHUTDOWN_PROBED does not guarantee that
* ShutdownRequested() hasn't been called indirectly.
* - else
* - Success!
*/
std::optional<ChainstateLoadingError> LoadChainstate(bool fReset,
ChainstateManager& chainman,
NodeContext& node,
bool fPruneMode,
const CChainParams& chainparams,
const ArgsManager& args,
bool fReindexChainState,
int64_t nBlockTreeDBCache,
int64_t nCoinDBCache,
int64_t nCoinCacheUsage);
#endif // BITCOIN_NODE_CHAINSTATE_H
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