fix: add custom logging handler (elucidate db locked errors?)

src/database/mod.rs

@@ -35,7 +35,7 @@ use std::fs;
 use std::path::{Path, PathBuf};
 use std::sync::{Arc, RwLock};
 use std::time::Duration;
-use tracing::{debug, trace};
+use tracing::{debug, error, trace};
 
 #[derive(Debug)]
 pub struct ConnectionOptions {
@@ -72,6 +72,15 @@ impl diesel::r2d2::CustomizeConnection<SqliteConnection, diesel::r2d2::Error>
 
 type DbPool = r2d2::Pool<ConnectionManager<SqliteConnection>>;
 
+#[derive(Debug)]
+pub struct LoggingHandler {}
+
+impl diesel::r2d2::HandleError<diesel::r2d2::Error> for LoggingHandler {
+    fn handle_error(&self, error: diesel::r2d2::Error) {
+        error!("{}", error);
+    }
+}
+
 pub struct OpenResult {
     pub db: UpEndDatabase,
     pub new: bool,
@@ -112,6 +121,7 @@ impl UpEndDatabase {
                 enable_foreign_keys: true,
                 busy_timeout: Some(Duration::from_secs(30)),
             }))
+            .error_handler(Box::new(LoggingHandler {}))
             .build(manager)?;
         trace!("Pool created.");
 

src/database/stores/fs/mod.rs

@@ -10,7 +10,7 @@ use crate::database::entry::{Entry, InvariantEntry};
 use crate::database::hierarchies::{
     resolve_path, resolve_path_cached, ResolveCache, UHierPath, UNode,
 };
-use crate::database::{UpEndConnection, UpEndDatabase, UPEND_SUBDIR};
+use crate::database::{LoggingHandler, UpEndConnection, UpEndDatabase, UPEND_SUBDIR};
 use crate::util::hash::{b58_encode, Hash, Hashable};
 use crate::util::jobs::{JobContainer, JobHandle};
 use anyhow::{anyhow, Error, Result};
@@ -122,6 +122,7 @@ impl FsStore {
 
         let pool = r2d2::Pool::builder()
             .connection_customizer(Box::new(ConnectionOptions {}))
+            .error_handler(Box::new(LoggingHandler {}))
             .build(manager)?;
 
         let lock = Arc::new(RwLock::new(()));