WIP: expoe remote storage path in layermapinfo

libs/pageserver_api/src/models.rs

@@ -515,6 +515,8 @@ pub enum HistoricLayerInfo {
         lsn_end: Lsn,
         remote: bool,
         access_stats: LayerAccessStats,
+
+        remote_path: Option<String>,
     },
     Image {
         layer_file_name: String,
@@ -523,6 +525,8 @@ pub enum HistoricLayerInfo {
         lsn_start: Lsn,
         remote: bool,
         access_stats: LayerAccessStats,
+
+        remote_path: Option<String>,
     },
 }
 

libs/remote_storage/src/lib.rs

@@ -81,6 +81,12 @@ impl std::fmt::Display for RemotePath {
     }
 }
 
+impl From<RemotePath> for String {
+    fn from(val: RemotePath) -> Self {
+        val.0.into()
+    }
+}
+
 impl RemotePath {
     pub fn new(relative_path: &Utf8Path) -> anyhow::Result<Self> {
         anyhow::ensure!(
@@ -102,7 +108,7 @@ impl RemotePath {
         self.0.file_name()
     }
 
-    pub fn join(&self, segment: &Utf8Path) -> Self {
+    pub fn join<P: AsRef<Utf8Path>>(&self, segment: P) -> Self {
         Self(self.0.join(segment))
     }
 

pageserver/src/deletion_queue.rs

@@ -345,7 +345,7 @@ impl DeletionList {
                 result.extend(
                     timeline_layers
                         .into_iter()
-                        .map(|l| timeline_remote_path.join(&Utf8PathBuf::from(l))),
+                        .map(|l| timeline_remote_path.join(Utf8PathBuf::from(l))),
                 );
             }
         }

pageserver/src/tenant/storage_layer/layer.rs

@@ -3,6 +3,7 @@ use camino::{Utf8Path, Utf8PathBuf};
 use pageserver_api::models::{
     HistoricLayerInfo, LayerAccessKind, LayerResidenceEventReason, LayerResidenceStatus,
 };
+use remote_storage::RemotePath;
 use std::ops::Range;
 use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
 use std::sync::{Arc, Weak};
@@ -305,6 +306,12 @@ impl Layer {
         &self.0.path
     }
 
+    /// This can return None even though it should return Some in some edge cases.
+    #[allow(unused)]
+    pub(crate) fn remote_path(&self) -> Option<RemotePath> {
+        self.0.remote_path()
+    }
+
     pub(crate) fn metadata(&self) -> LayerFileMetadata {
         self.0.metadata()
     }
@@ -918,6 +925,17 @@ impl LayerInner {
         }
     }
 
+    /// This can return None even though it should return Some in some edge cases.
+    fn remote_path(&self) -> Option<RemotePath> {
+        let tl = self.timeline.upgrade()?; // TODO: should distinguish this case, but, accuracy doesn't matter for this field.
+        Some(crate::tenant::remote_timeline_client::remote_layer_path(
+            &tl.tenant_id,
+            &tl.timeline_id,
+            &self.desc.filename(),
+            self.generation,
+        ))
+    }
+
     fn info(&self, reset: LayerAccessStatsReset) -> HistoricLayerInfo {
         let layer_file_name = self.desc.filename().file_name();
 
@@ -937,6 +955,7 @@ impl LayerInner {
                 lsn_end: lsn_range.end,
                 remote,
                 access_stats,
+                remote_path: self.remote_path().map(|p| p.into()),
             }
         } else {
             let lsn = self.desc.image_layer_lsn();
@@ -947,6 +966,7 @@ impl LayerInner {
                 lsn_start: lsn,
                 remote,
                 access_stats,
+                remote_path: self.remote_path().map(|p| p.into()),
             }
         }
     }

test_runner/fixtures/pageserver/http.py

@@ -58,6 +58,7 @@ class HistoricLayerInfo:
     lsn_start: str
     lsn_end: Optional[str]
     remote: bool
+    remote_path: Optional[str] = None
 
     @classmethod
     def from_json(cls, d: Dict[str, Any]) -> HistoricLayerInfo:
@@ -68,6 +69,7 @@ class HistoricLayerInfo:
             lsn_start=d["lsn_start"],
             lsn_end=d.get("lsn_end"),
             remote=d["remote"],
+            remote_path=d.get("remote_path"),
         )