[database] Add AnyDatabase and ConfigurableDatabase

This is related to #43

src/database/mod.rs

@@ -43,6 +43,9 @@ use bitcoin::{OutPoint, Script, Transaction, TxOut};
 use crate::error::Error;
 use crate::types::*;
 
+pub mod any;
+pub use any::{AnyDatabase, AnyDatabaseConfig};
+
 #[cfg(feature = "key-value-db")]
 pub(crate) mod keyvalue;
 
@@ -159,6 +162,15 @@ pub trait BatchDatabase: Database {
     fn commit_batch(&mut self, batch: Self::Batch) -> Result<(), Error>;
 }
 
+/// Trait for [`Database`] types that can be created given a configuration
+pub trait ConfigurableDatabase: Database + Sized {
+    /// Type that contains the configuration
+    type Config: std::fmt::Debug;
+
+    /// Create a new instance given a configuration
+    fn from_config(config: &Self::Config) -> Result<Self, Error>;
+}
+
 pub(crate) trait DatabaseUtils: Database {
     fn is_mine(&self, script: &Script) -> Result<bool, Error> {
         self.get_path_from_script_pubkey(script)