First attempt at database

Cargo.lock

@@ -2,11 +2,18 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "itoa"
+version = "1.0.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "453ad9f582a441959e5f0d088b02ce04cfe8d51a8eaf077f12ac6d3e94164ca6"
+
 [[package]]
 name = "musichoard"
 version = "0.1.0"
 dependencies = [
  "serde",
+ "serde_json",
  "uuid",
 ]
 
@@ -28,6 +35,12 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "ryu"
+version = "1.0.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f91339c0467de62360649f8d3e185ca8de4224ff281f66000de5eb2a77a79041"
+
 [[package]]
 name = "serde"
 version = "1.0.159"
@@ -48,6 +61,17 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "serde_json"
+version = "1.0.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d721eca97ac802aa7777b701877c8004d950fc142651367300d21c1cc0194744"
+dependencies = [
+ "itoa",
+ "ryu",
+ "serde",
+]
+
 [[package]]
 name = "syn"
 version = "2.0.11"

Cargo.toml

@@ -7,4 +7,5 @@ edition = "2021"
 
 [dependencies]
 serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
 uuid = { version = "1.3", features = ["serde"] }

src/database/json.rs

@@ -0,0 +1,39 @@
+use std::fs::File;
+use std::io::{Read, Write};
+use std::path::Path;
+
+use serde::de::DeserializeOwned;
+use serde::Serialize;
+
+use crate::database::DatabaseRead;
+
+use super::DatabaseWrite;
+
+struct DatabaseReaderJson {}
+
+impl DatabaseRead for DatabaseReaderJson {
+    fn read<D>(path: &Path, collection: &mut D) -> Result<(), std::io::Error>
+    where
+        D: DeserializeOwned,
+    {
+        // Read entire file to memory as for now this is faster than a buffered read from disk:
+        // https://github.com/serde-rs/json/issues/160
+        let mut serialized = String::new();
+        File::open(path)?.read_to_string(&mut serialized)?;
+
+        *collection = serde_json::from_str(&serialized)?;
+        Ok(())
+    }
+}
+
+struct DatabaseWriterJson {}
+
+impl DatabaseWrite for DatabaseWriterJson {
+    fn write<S>(path: &Path, collection: &S) -> Result<(), std::io::Error>
+    where
+        S: Serialize,
+    {
+        let serialized = serde_json::to_string(&collection)?;
+        File::open(path)?.write_all(serialized.as_bytes())
+    }
+}

src/database/mod.rs

@@ -0,0 +1,18 @@
+use std::path::Path;
+
+use serde::de::DeserializeOwned;
+use serde::Serialize;
+
+mod json;
+
+trait DatabaseRead {
+    fn read<D>(path: &Path, collection: &mut D) -> Result<(), std::io::Error>
+    where
+        D: DeserializeOwned;
+}
+
+trait DatabaseWrite {
+    fn write<S>(path: &Path, collection: &S) -> Result<(), std::io::Error>
+    where
+        S: Serialize;
+}

src/lib.rs

@@ -3,6 +3,8 @@
 use serde::{Deserialize, Serialize};
 use uuid;
 
+mod database;
+
 /// [MusicBrainz Identifier](https://musicbrainz.org/doc/MusicBrainz_Identifier) (MBID).
 pub type Mbid = uuid::Uuid;