increase default pool size for sqlite inmemory dbs

Fixes #713

Author: lovasoa

examples/official-site/sqlpage/sqlpage.yaml

@@ -1,5 +1,7 @@
 # The documentation site is fully static, so we don't need to persist any data.
-database_url: "sqlite::memory:"
+database_url: "sqlite::memory:?cache=shared"
 
 # We have a file upload example, and would like to limit the size of the uploaded files 
-max_uploaded_file_size: 256000
+max_uploaded_file_size: 256000
+
+database_connection_acquire_timeout_seconds: 30

examples/simple-website-example/sqlpage/sqlpage.json

@@ -1,4 +1,3 @@
 {
-  "database_url": "sqlite://:memory:",
-  "database_connection_acquire_timeout_seconds": 86400
+  "database_url": "sqlite://:memory:"
 }

src/app_config.rs

@@ -393,7 +393,7 @@ fn parse_socket_addr(host_str: &str) -> anyhow::Result<SocketAddr> {
 
 #[cfg(test)]
 fn default_database_url() -> String {
-    "sqlite://:memory:".to_owned()
+    "sqlite://:memory:?cache=shared".to_owned()
 }
 #[cfg(not(test))]
 fn default_database_url() -> String {
@@ -433,7 +433,7 @@ fn create_default_database(configuration_directory: &Path) -> String {
     }
 
     log::warn!("No DATABASE_URL provided, and {:?} is not writeable. Using a temporary in-memory SQLite database. All the data created will be lost when this server shuts down.", configuration_directory);
-    prefix + ":memory:"
+    prefix + ":memory:?cache=shared"
 }
 
 fn encode_uri(path: &Path) -> std::borrow::Cow<str> {

src/webserver/database/connect.rs

@@ -65,8 +65,7 @@ impl Database {
                     AnyKind::MySql => 75,
                     AnyKind::Sqlite => {
                         if config.database_url.contains(":memory:") {
-                            // Create no more than a single in-memory database connection
-                            1
+                            128
                         } else {
                             16
                         }