[pbs-devel] [PATCH 1/2] rrd: relay error to update database to caller

[Thomas Lamprecht]

It does not make much sense to just log here, especially as the update
fn has no context about what RRD series it's operating on.

I.e., logged message previously:
> rrd update failed: time in past (...)

vs logged message now:
> rrd::update_value 'host/cpu' failed - time in past (...)

The callers of the Database::update fn in the RRD Cache map can
already handle errors, albeit it won't save the freshly loaded RRD in
the map anymore if the update fails, any load will still do that
though.

Signed-off-by: Thomas Lamprecht <t.lamprecht at proxmox.com>
---
It might be slightly nicer to factor out the common call to update to
happen after getting/creating the RRD, but it's not trivial to do so as
efficiently due to ownership handover when inserting the RRD in the map.

 proxmox-rrd/src/cache/rrd_map.rs |  4 ++--
 proxmox-rrd/src/rrd.rs           | 14 ++++++--------
 2 files changed, 8 insertions(+), 10 deletions(-)

diff --git a/proxmox-rrd/src/cache/rrd_map.rs b/proxmox-rrd/src/cache/rrd_map.rs
index 0ef61cfa..4bcedade 100644
--- a/proxmox-rrd/src/cache/rrd_map.rs
+++ b/proxmox-rrd/src/cache/rrd_map.rs
@@ -42,7 +42,7 @@ impl RRDMap {
     ) -> Result<(), Error> {
         if let Some(rrd) = self.map.get_mut(rel_path) {
             if !new_only || time > rrd.last_update() {
-                rrd.update(time, value);
+                rrd.update(time, value)?;
             }
         } else {
             let mut path = self.config.basedir.clone();
@@ -61,7 +61,7 @@ impl RRDMap {
             };
 
             if !new_only || time > rrd.last_update() {
-                rrd.update(time, value);
+                rrd.update(time, value)?;
             }
             self.map.insert(rel_path.to_string(), rrd);
         }
diff --git a/proxmox-rrd/src/rrd.rs b/proxmox-rrd/src/rrd.rs
index 440abe06..4bf4f01b 100644
--- a/proxmox-rrd/src/rrd.rs
+++ b/proxmox-rrd/src/rrd.rs
@@ -469,14 +469,10 @@ impl Database {
     /// Update the value (in memory)
     ///
     /// Note: This does not call [Self::save].
-    pub fn update(&mut self, time: f64, value: f64) {
-        let value = match self.source.compute_new_value(time, value) {
-            Ok(value) => value,
-            Err(err) => {
-                log::error!("rrd update failed: {}", err);
-                return;
-            }
-        };
+    pub fn update(&mut self, time: f64, value: f64) -> Result<(), Error> {
+        let value = self
+            .source
+            .compute_new_value(time, value)?;
 
         let last_update = self.source.last_update;
         self.source.last_update = time;
@@ -485,6 +481,8 @@ impl Database {
             rra.delete_old_slots(time, last_update);
             rra.compute_new_value(time, last_update, value);
         }
+
+        Ok(())
     }
 
     /// Extract data from the archive
-- 
2.39.5