Add hierarchy_max_depth config option

src/config/mod.rs

@@ -52,6 +52,8 @@ pub struct Config {
     pub allow_unstable_room_versions: bool,
     #[serde(default = "default_default_room_version")]
     pub default_room_version: RoomVersionId,
+    #[serde(default = "default_hierarchy_max_depth")]
+    pub hierarchy_max_depth: u64,
     #[serde(default = "false_fn")]
     pub allow_jaeger: bool,
     #[serde(default = "false_fn")]
@@ -261,3 +263,7 @@ fn default_turn_ttl() -> u64 {
 pub fn default_default_room_version() -> RoomVersionId {
     RoomVersionId::V9
 }
+
+fn default_hierarchy_max_depth() -> u64 {
+    6
+}

src/service/globals/mod.rs

@@ -250,6 +250,10 @@ impl Service {
         self.config.enable_lightning_bolt
     }
 
+    pub fn hierarchy_max_depth(&self) -> u64 {
+        self.config.hierarchy_max_depth
+    }
+
     pub fn trusted_servers(&self) -> &[OwnedServerName] {
         &self.config.trusted_servers
     }