add database backup with admin commands

Signed-off-by: Jason Volk <jason@zemos.net>

src/service/admin/mod.rs

@@ -436,6 +436,12 @@ enum ServerCommand {
 	ClearServiceCaches {
 		amount: u32,
 	},
+
+	/// - Backup the database
+	BackupDatabase,
+
+	/// - List database backups
+	ListBackups,
 }
 
 #[derive(Debug)]
@@ -1866,6 +1872,27 @@ impl Service {
 
 					RoomMessageEventContent::text_plain("Done.")
 				},
+				ServerCommand::ListBackups => {
+					let result = services().globals.db.backup_list()?;
+
+					RoomMessageEventContent::text_plain(result)
+				},
+				ServerCommand::BackupDatabase => {
+					let mut result = tokio::task::spawn_blocking(move || {
+						match services().globals.db.backup() {
+							Ok(_) => String::new(),
+							Err(e) => (*e).to_string(),
+						}
+					})
+					.await
+					.unwrap();
+
+					if result.is_empty() {
+						result = services().globals.db.backup_list()?;
+					}
+
+					RoomMessageEventContent::text_plain(&result)
+				},
 			},
 			AdminCommand::Debug(command) => match command {
 				DebugCommand::GetAuthChain {

src/service/globals/data.rs

@@ -1,4 +1,5 @@
 use std::collections::BTreeMap;
+use std::error::Error;
 
 use async_trait::async_trait;
 use ruma::{
@@ -32,4 +33,6 @@ pub trait Data: Send + Sync {
 	fn signing_keys_for(&self, origin: &ServerName) -> Result<BTreeMap<OwnedServerSigningKeyId, VerifyKey>>;
 	fn database_version(&self) -> Result<u64>;
 	fn bump_database_version(&self, new_version: u64) -> Result<()>;
+	fn backup(&self) -> Result<(), Box<dyn Error>> { unimplemented!() }
+	fn backup_list(&self) -> Result<String> { Ok(String::new()) }
 }