From 076901273f1bbd9c9a65fb5230d7d32ec829c495 Mon Sep 17 00:00:00 2001
From: Joonas Koivunen <joonas@neon.tech>
Date: Mon, 21 Aug 2023 23:40:09 +0300
Subject: [PATCH] layerdesc: add from_filename

---
 .../src/tenant/storage_layer/layer_desc.rs      | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/pageserver/src/tenant/storage_layer/layer_desc.rs b/pageserver/src/tenant/storage_layer/layer_desc.rs
index 59ca0f33e0..58d883753f 100644
--- a/pageserver/src/tenant/storage_layer/layer_desc.rs
+++ b/pageserver/src/tenant/storage_layer/layer_desc.rs
@@ -101,6 +101,23 @@ impl PersistentLayerDesc {
         }
     }
 
+    pub fn from_filename(
+        tenant_id: TenantId,
+        timeline_id: TimelineId,
+        filename: LayerFileName,
+        file_size: u64,
+    ) -> Self {
+        match filename {
+            LayerFileName::Image(i) => {
+                // FIXME: can we incremental image layers or is this for future use?
+                Self::new_img(tenant_id, timeline_id, i.key_range, i.lsn, file_size)
+            }
+            LayerFileName::Delta(d) => {
+                Self::new_delta(tenant_id, timeline_id, d.key_range, d.lsn_range, file_size)
+            }
+        }
+    }
+
     /// Get the LSN that the image layer covers.
     pub fn image_layer_lsn(&self) -> Lsn {
         assert!(!self.is_delta);