Generate a random name for in-memory database and set cache to shared…

… by default (#595)

* Generate a random name for in-memory database

* Add entry to CHANGELOG.md

* Set cache to shared as we crash otherwise

* Actually, we know what the issue is now

CHANGELOG.md

@@ -39,6 +39,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix `schema` tasks being triggered too often [#581](https://github.com/p2panda/aquadoggo/pull/581)
 - Fix blobs getting corrupted when written to the file system [#587](https://github.com/p2panda/aquadoggo/pull/587)
 - Fix pagination bug when only one field is selected and sorted at the same time [#593](https://github.com/p2panda/aquadoggo/pull/593)
+- Fix SQLite in-memory database overwrite by giving them each a random name [#595](https://github.com/p2panda/aquadoggo/pull/595)
 
 ## [0.5.0]
 

aquadoggo_cli/Cargo.toml

@@ -31,6 +31,7 @@ libp2p = "0.52.0"
 log = "0.4.20"
 p2panda-rs = "0.8.0"
 path-clean = "1.0.1"
+rand = "0.8.5"
 serde = { version = "1.0.185", features = ["serde_derive"] }
 tempfile = "3.7.0"
 tokio = { version = "1.28.2", features = ["full"] }

aquadoggo_cli/src/config.rs

@@ -292,10 +292,25 @@ pub struct Configuration {
 
 impl Default for Configuration {
     fn default() -> Self {
+        let database_url = {
+            // Give each in-memory SQLite database an unique name as we're observing funny issues with
+            // SQLite sharing data between processes (!) and breaking each others databases
+            // potentially.
+            //
+            // See related issue: https://github.com/p2panda/aquadoggo/issues/568
+            let db_name = format!("dbmem{}", rand::random::<u32>());
+
+            // Set "mode=memory" to enable SQLite running in-memory and set "cache=shared", as
+            // setting it to "private" would break sqlx / SQLite.
+            //
+            // See related issue: https://github.com/launchbadge/sqlx/issues/2510
+            format!("sqlite://file:{db_name}?mode=memory&cache=shared")
+        };
+
         Self {
             log_level: "off".into(),
             allow_schema_ids: UncheckedAllowList::Wildcard,
-            database_url: "sqlite::memory:".into(),
+            database_url,
             database_max_connections: 32,
             http_port: 2020,
             quic_port: 2022,
@@ -471,7 +486,9 @@ pub fn print_config(
         AllowList::Wildcard => format!("{WILDCARD} (any schema id)"),
     };
 
-    let database_url = if config.database_url == "sqlite::memory:" {
+    let database_url = if config.database_url == "sqlite::memory:"
+        || config.database_url.contains("mode=memory")
+    {
         "memory (data is not persisted)".into()
     } else if config.database_url.contains("sqlite:") {
         format!("SQLite: {}", config.database_url)