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-rw-r--r--src/db/lib.rs37
1 files changed, 16 insertions, 21 deletions
diff --git a/src/db/lib.rs b/src/db/lib.rs
index 427140f9..eef3e177 100644
--- a/src/db/lib.rs
+++ b/src/db/lib.rs
@@ -172,47 +172,42 @@ 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 {
- #[cfg(feature = "lmdb")]
Lmdb,
-
- #[cfg(feature = "sqlite")]
Sqlite,
-
- #[cfg(feature = "sled")]
Sled,
}
-impl std::fmt::Display for Engine {
- fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
+impl Engine {
+ /// Return variant name as static `&str`
+ pub fn as_str(&self) -> &'static str {
match self {
- #[cfg(feature = "lmdb")]
- Self::Lmdb => fmt.write_str("lmdb"),
-
- #[cfg(feature = "sqlite")]
- Self::Sqlite => fmt.write_str("sqlite"),
-
- #[cfg(feature = "sled")]
- Self::Sled => fmt.write_str("sled"),
+ 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 {
- #[cfg(feature = "lmdb")]
"lmdb" | "heed" => Ok(Self::Lmdb),
-
- #[cfg(feature = "sqlite")]
"sqlite" | "sqlite3" | "rusqlite" => Ok(Self::Sqlite),
-
- #[cfg(feature = "sled")]
"sled" => Ok(Self::Sled),
-
kind => Err(Error(format!("Invalid DB engine: {}", kind).into())),
}
}