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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright [yyyy] [name of copyright owner] + + 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. diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..6a1e1d0 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,83 @@ +#[macro_use] +extern crate log; +pub mod log_db { + use fs2::FileExt; + use priority_queue::PriorityQueue; + use std::collections::BTreeMap; + use std::fs; + use std::io; + use std::io::Write; + use std::path::{Path, PathBuf}; + + const ACTIVE_LOG_FILENAME: &str = "db"; + + pub trait Record { + fn serialize(&self) -> Vec; + fn deserialize(data: Vec) -> Self; + } + + pub struct Config { + /// Directory where the database will store its data. + pub data_dir: String, + /// The maximum size of a segment file in bytes. + /// Once a segment file reaches this size, it is closed and a new one is created. + /// Closed segment files can be compacted. + pub segment_size: u64, + /// The maximum size of a single memtable in bytes. + /// Note that each secondary index will have its own memtable. + pub memtable_size: u64, + } + + pub struct DB { + data_dir: String, + segment_size: u64, + memtable_size: u64, + + pub log_path: PathBuf, + primary_memtable: BTreeMap, + } + + impl DB { + pub fn initialize(config: &Config) -> Result, io::Error> { + info!("Initializing DB"); + // If data_dir does not exist, create it + if !fs::exists(&config.data_dir)? { + fs::create_dir_all(&config.data_dir)?; + } + + let log_path = Path::new(&config.data_dir).join(ACTIVE_LOG_FILENAME); + + let db = DB:: { + data_dir: config.data_dir.clone(), + segment_size: config.segment_size, + memtable_size: config.memtable_size, + + log_path, + primary_memtable: BTreeMap::new(), + }; + Ok(db) + } + + pub fn upsert(&self, record: &T) -> Result<(), io::Error> { + let mut file = fs::OpenOptions::new() + .create(true) + .append(true) + .open(&self.log_path)?; + + // Acquire an exclusive lock for writing + file.lock_exclusive()?; + + // Write the record to the log + let serialized = record.serialize(); + file.write_all(&serialized)?; + + // Sync to disk + file.flush()?; + file.sync_all()?; + + file.unlock()?; + + Ok(()) + } + } +} diff --git a/tests/integration.rs b/tests/integration.rs new file mode 100644 index 0000000..e500219 --- /dev/null +++ b/tests/integration.rs @@ -0,0 +1,60 @@ +use log_db::log_db; +use serial_test::serial; + +const TEST_DATA_DIR: &str = "test_db_data"; +const TEST_SEGMENT_SIZE: u64 = 1024 * 1024; // 1 MB +const TEST_MEMTABLE_SIZE: u64 = 1024 * 1024; // 1 MB + +struct TestRecord { + id: u64, + data: String, +} + +impl log_db::Record for TestRecord { + fn serialize(&self) -> Vec { + format!("{}:{}", self.id, self.data).into_bytes() + } + + fn deserialize(data: Vec) -> Self { + let data = String::from_utf8(data).unwrap(); + let parts: Vec<&str> = data.split(':').collect(); + TestRecord { + id: parts[0].parse().unwrap(), + data: parts[1].to_string(), + } + } +} + +#[test] +#[serial] +fn test_initialize() { + let _db: log_db::DB = log_db::DB::initialize(&log_db::Config { + data_dir: TEST_DATA_DIR.to_string(), + segment_size: TEST_SEGMENT_SIZE, + memtable_size: TEST_MEMTABLE_SIZE, + }) + .unwrap(); + + // Clean up + std::fs::remove_dir_all(TEST_DATA_DIR.to_string()).unwrap(); +} + +#[test] +#[serial] +fn test_upsert_to_empty_db() { + let db: log_db::DB = log_db::DB::initialize(&log_db::Config { + data_dir: TEST_DATA_DIR.to_string(), + segment_size: TEST_SEGMENT_SIZE, + memtable_size: TEST_MEMTABLE_SIZE, + }) + .unwrap(); + + let record = TestRecord { + id: 1, + data: "hello".to_string(), + }; + db.upsert(&record).unwrap(); + + // Clean up + std::fs::remove_dir_all(TEST_DATA_DIR.to_string()).unwrap(); +} -- cgit v1.3