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-rw-r--r--src/db/open.rs153
1 files changed, 153 insertions, 0 deletions
diff --git a/src/db/open.rs b/src/db/open.rs
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+use std::path::PathBuf;
+
+use crate::{Db, Error, Result};
+
+/// List of supported database engine types
+///
+/// The `enum` holds list of *all* database engines that are are be supported by crate, no matter
+/// if relevant feature is enabled or not. It allows us to distinguish between invalid engine
+/// and valid engine, whose support is not enabled via feature flag.
+#[derive(Clone, Copy, Debug, PartialEq, Eq)]
+pub enum Engine {
+ Lmdb,
+ Sqlite,
+ Sled,
+}
+
+impl Engine {
+ /// Return variant name as static `&str`
+ pub fn as_str(&self) -> &'static str {
+ match self {
+ Self::Lmdb => "lmdb",
+ Self::Sqlite => "sqlite",
+ Self::Sled => "sled",
+ }
+ }
+}
+
+impl std::fmt::Display for Engine {
+ fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
+ self.as_str().fmt(fmt)
+ }
+}
+
+impl std::str::FromStr for Engine {
+ type Err = Error;
+
+ fn from_str(text: &str) -> Result<Engine> {
+ match text {
+ "lmdb" | "heed" => Ok(Self::Lmdb),
+ "sqlite" | "sqlite3" | "rusqlite" => Ok(Self::Sqlite),
+ "sled" => Ok(Self::Sled),
+ kind => Err(Error(
+ format!(
+ "Invalid DB engine: {} (options are: lmdb, sled, sqlite)",
+ kind
+ )
+ .into(),
+ )),
+ }
+ }
+}
+
+pub struct OpenOpt {
+ pub fsync: bool,
+ pub lmdb_map_size: Option<usize>,
+ pub sled_cache_capacity: usize,
+ pub sled_flush_every_ms: u64,
+}
+
+impl Default for OpenOpt {
+ fn default() -> Self {
+ Self {
+ fsync: false,
+ lmdb_map_size: None,
+ sled_cache_capacity: 1024 * 1024 * 1024,
+ sled_flush_every_ms: 2000,
+ }
+ }
+}
+
+pub fn open_db(path: &PathBuf, engine: Engine, opt: &OpenOpt) -> Result<Db> {
+ match engine {
+ // ---- Sled DB ----
+ #[cfg(feature = "sled")]
+ Engine::Sled => {
+ if opt.fsync {
+ return Err(Error(
+ "`metadata_fsync = true` is not supported with the Sled database engine".into(),
+ ));
+ }
+ info!("Opening Sled database at: {}", path.display());
+ let db = crate::sled_adapter::sled::Config::default()
+ .path(&path)
+ .cache_capacity(opt.sled_cache_capacity as u64)
+ .flush_every_ms(Some(opt.sled_flush_every_ms))
+ .open()?;
+ Ok(crate::sled_adapter::SledDb::init(db))
+ }
+
+ // ---- Sqlite DB ----
+ #[cfg(feature = "sqlite")]
+ Engine::Sqlite => {
+ info!("Opening Sqlite database at: {}", path.display());
+ let db = crate::sqlite_adapter::rusqlite::Connection::open(&path)?;
+ db.pragma_update(None, "journal_mode", "WAL")?;
+ if opt.fsync {
+ db.pragma_update(None, "synchronous", "NORMAL")?;
+ } else {
+ db.pragma_update(None, "synchronous", "OFF")?;
+ }
+ Ok(crate::sqlite_adapter::SqliteDb::init(db))
+ }
+
+ // ---- LMDB DB ----
+ #[cfg(feature = "lmdb")]
+ Engine::Lmdb => {
+ info!("Opening LMDB database at: {}", path.display());
+ if let Err(e) = std::fs::create_dir_all(&path) {
+ return Err(Error(
+ format!("Unable to create LMDB data directory: {}", e).into(),
+ ));
+ }
+
+ let map_size = match opt.lmdb_map_size {
+ None => crate::lmdb_adapter::recommended_map_size(),
+ Some(v) => v - (v % 4096),
+ };
+
+ let mut env_builder = heed::EnvOpenOptions::new();
+ env_builder.max_dbs(100);
+ env_builder.map_size(map_size);
+ env_builder.max_readers(2048);
+ unsafe {
+ env_builder.flag(crate::lmdb_adapter::heed::flags::Flags::MdbNoMetaSync);
+ if !opt.fsync {
+ env_builder.flag(heed::flags::Flags::MdbNoSync);
+ }
+ }
+ match env_builder.open(&path) {
+ Err(heed::Error::Io(e)) if e.kind() == std::io::ErrorKind::OutOfMemory => {
+ return Err(Error(
+ "OutOfMemory error while trying to open LMDB database. This can happen \
+ if your operating system is not allowing you to use sufficient virtual \
+ memory address space. Please check that no limit is set (ulimit -v). \
+ You may also try to set a smaller `lmdb_map_size` configuration parameter. \
+ On 32-bit machines, you should probably switch to another database engine."
+ .into(),
+ ))
+ }
+ Err(e) => Err(Error(format!("Cannot open LMDB database: {}", e).into())),
+ Ok(db) => Ok(crate::lmdb_adapter::LmdbDb::init(db)),
+ }
+ }
+
+ // Pattern is unreachable when all supported DB engines are compiled into binary. The allow
+ // attribute is added so that we won't have to change this match in case stop building
+ // support for one or more engines by default.
+ #[allow(unreachable_patterns)]
+ engine => Err(Error(
+ format!("DB engine support not available in this build: {}", engine).into(),
+ )),
+ }
+}