72 lines
2.6 KiB
C
72 lines
2.6 KiB
C
#pragma once
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/**
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* Piggyback on the datastore to access the journal entries
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*/
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#include <stdint.h>
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#include <stdlib.h>
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#include "lmdb.h"
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#include "libp2p/db/datastore.h"
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#include "ipfs/repo/fsrepo/lmdb_cursor.h"
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struct JournalRecord {
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unsigned long long timestamp; // the timestamp of the file
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int pin; // true if it is to be stored, false if it is to be deleted
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int pending; // true if we do not have this file yet
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uint8_t *hash; // the hash of the block (file)
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size_t hash_size; // the size of the hash
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};
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struct JournalRecord* lmdb_journal_record_new();
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int lmdb_journal_record_free(struct JournalRecord* rec);
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/**
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* Open a cursor to the journalstore table
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* @param db_handle a handle to the database (an MDB_env pointer)
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* @param cursor where to place the results
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* @returns true(1) on success, false(0) otherwise
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*/
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int lmdb_journalstore_cursor_open(void* db_handle, struct lmdb_trans_cursor **cursor, struct MDB_txn *trans_to_use);
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/**
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* Read a record from the cursor
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*/
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int lmdb_journalstore_cursor_get(struct lmdb_trans_cursor *cursor, enum DatastoreCursorOp op, struct JournalRecord** record);
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/***
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* Write the record at the cursor
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* @param crsr the cursor
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* @param journal_record the record to write
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* @returns true(1) on success, false(0) otherwise
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*/
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int lmdb_journalstore_cursor_put(struct lmdb_trans_cursor *crsr, struct JournalRecord* journal_record);
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/**
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* Close the cursor
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*/
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int lmdb_journalstore_cursor_close(struct lmdb_trans_cursor *cursor, int commitTransaction);
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int journal_record_free(struct JournalRecord* rec);
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int lmdb_journalstore_journal_add(struct lmdb_trans_cursor *journalstore_cursor, struct JournalRecord *journalstore_record);
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/***
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* Attempt to get a specific record identified by its timestamp and bytes
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* @param handle a handle to the database engine
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* @param journalstore_cursor the cursor (will be returned as a cursor that points to the record found
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* @param journalstore_record where to put the results (can pass null). If data is within the struct, will use it as search criteria
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* @returns true(1) on success, false(0) otherwise
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*/
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int lmdb_journalstore_get_record(void* handle, struct lmdb_trans_cursor *journalstore_cursor, struct JournalRecord **journalstore_record);
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/***
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* Convert the JournalRec struct into a lmdb key and lmdb value
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* @param journal_record the record to convert
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* @param db_key where to store the key information
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* @param db_value where to store the value information
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*/
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int lmdb_journalstore_build_key_value_pair(const struct JournalRecord* journal_record, struct MDB_val* db_key, struct MDB_val *db_value);
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