2 files changed, 49 insertions, 12 deletions
diff --git a/src/db/Cargo.toml b/src/db/Cargo.toml
index 530f1966..fddc5cca 100644
--- a/src/db/Cargo.toml
+++ b/src/db/Cargo.toml
@@ -12,24 +12,19 @@ readme = "../../README.md"
 path = "lib.rs"
 
 [dependencies]
-err-derive = "0.3"
-hexdump = "0.1"
-tracing = "0.1"
+err-derive.workspace = true
+hexdump.workspace = true
+tracing.workspace = true
 
-heed = { version = "0.11", default-features = false, features = ["lmdb"], optional = true }
-rusqlite = { version = "0.29", optional = true }
-sled = { version = "0.34", optional = true }
-
-# cli deps
-clap = { version = "4.1", optional = true, features = ["derive", "env"] }
-pretty_env_logger = { version = "0.5", optional = true }
+heed = { workspace = true, optional = true }
+rusqlite = { workspace = true, optional = true }
+sled = { workspace = true, optional = true }
 
 [dev-dependencies]
-mktemp = "0.5"
+mktemp.workspace = true
 
 [features]
 default = [ "sled", "lmdb", "sqlite" ]
 bundled-libs = [ "rusqlite?/bundled" ]
-cli = ["clap", "pretty_env_logger"]
 lmdb = [ "heed" ]
 sqlite = [ "rusqlite" ]
diff --git a/src/db/lib.rs b/src/db/lib.rs
index fe44b01e..eef3e177 100644
--- a/src/db/lib.rs
+++ b/src/db/lib.rs
@@ -171,6 +171,48 @@ impl Db {
 	}
 }
 
+/// 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: {}", kind).into())),
+		}
+	}
+}
+
 #[allow(clippy::len_without_is_empty)]
 impl Tree {
 	#[inline]