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https://github.com/status-im/nim-rocksdb.git
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94 lines
3.1 KiB
Nim
94 lines
3.1 KiB
Nim
# Nim-RocksDB
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# Copyright 2018-2019 Status Research & Development GmbH
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# Licensed under either of
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#
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
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# * GPL license, version 2.0, ([LICENSE-GPLv2](LICENSE-GPLv2) or https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html)
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#
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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{.used.}
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import
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cpuinfo, os, unittest,
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tempfile,
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../rocksdb
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suite "RocksDB C wrapper tests":
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setup:
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let
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dbPath: cstring = mkdtemp()
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dbBackupPath: cstring = mkdtemp()
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teardown:
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removeDir($dbPath)
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removeDir($dbBackupPath)
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test "Simple create-update-close example":
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var
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db: rocksdb_t
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be: rocksdb_backup_engine_t
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options = rocksdb_options_create()
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let cpus = countProcessors()
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rocksdb_options_increase_parallelism(options, cpus.int32)
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# This requires snappy - disabled because rocksdb is not always compiled with
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# snappy support (for example Fedora 28, certain Ubuntu versions)
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# rocksdb_options_optimize_level_style_compaction(options, 0);
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# create the DB if it's not already present
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rocksdb_options_set_create_if_missing(options, 1);
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# open DB
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var err: cstring # memory leak: example code does not free error string!
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db = rocksdb_open(options, dbPath, err.addr)
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check: err.isNil
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# open Backup Engine that we will use for backing up our database
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be = rocksdb_backup_engine_open(options, dbBackupPath, err.addr)
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check: err.isNil
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# Put key-value
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var writeOptions = rocksdb_writeoptions_create()
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let key = "key"
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let put_value = "value"
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rocksdb_put(
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db, writeOptions, key.cstring, csize_t(key.len),
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put_value.cstring, csize_t(put_value.len), err.addr)
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check: err.isNil
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# Get value
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var readOptions = rocksdb_readoptions_create()
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var len: csize_t
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let raw_value = rocksdb_get(
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db, readOptions, key, csize_t(key.len), addr len, err.addr) # Important: rocksdb_get is not null-terminated
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check: err.isNil
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# Copy it to a regular Nim string (copyMem workaround because non-null terminated)
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var get_value = newString(int(len))
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copyMem(addr get_value[0], unsafeAddr raw_value[0], int(len) * sizeof(char))
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check: $get_value == $put_value
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# create new backup in a directory specified by DBBackupPath
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rocksdb_backup_engine_create_new_backup(be, db, err.addr)
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check: err.isNil
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rocksdb_close(db)
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# If something is wrong, you might want to restore data from last backup
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var restoreOptions = rocksdb_restore_options_create()
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rocksdb_backup_engine_restore_db_from_latest_backup(be, dbPath, dbPath,
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restoreOptions, err.addr)
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check: err.isNil
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rocksdb_restore_options_destroy(restore_options)
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db = rocksdb_open(options, dbPath, err.addr)
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check: err.isNil
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# cleanup
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rocksdb_writeoptions_destroy(writeOptions)
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rocksdb_readoptions_destroy(readOptions)
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rocksdb_options_destroy(options)
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rocksdb_backup_engine_close(be)
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rocksdb_close(db)
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