solved duplicate points error

netatmo_service/rrd.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import colorsys
+import logging
 import re
 import tempfile
 from pathlib import Path
@@ -10,6 +11,7 @@ import rrdtool
 from .data import Sample
 
 RRD_ERROR = rrdtool.OperationalError
+LOG = logging.getLogger(__name__)
 
 STEP = 600
 HEARTBEAT = 1500
@@ -53,15 +55,26 @@ class RRDStore:
                      "RRA:AVERAGE:0.5:36:1464", "RRA:MIN:0.5:36:1464", "RRA:MAX:0.5:36:1464"]
             rrdtool.create(str(path), *args)
 
-    def update(self, name: str, sample: Sample) -> None:
+    def update(self, name: str, sample: Sample) -> bool:
+        """Store at most one sample per RRD step; return whether it was written."""
+        path = self.path(name)
+        last_timestamp = int(rrdtool.last(str(path)))
+        if sample.timestamp // STEP <= last_timestamp // STEP:
+            LOG.info(
+                "Skipping %s RRD update: sample interval already stored "
+                "(sample_timestamp=%d last_timestamp=%d)",
+                name, sample.timestamp, last_timestamp,
+            )
+            return False
         schema = SCHEMAS[name]
         fields = list(schema)
         values = ["U" if sample.values.get(field) is None else str(sample.values[field]) for field in fields]
         rrdtool.update(
-            str(self.path(name)),
+            str(path),
             "--template", ":".join(fields),
             f"{sample.timestamp}:{':'.join(values)}",
         )
+        return True
 
     def last(self, name: str, field: str) -> dict:
         if name not in SCHEMAS or field not in SCHEMAS[name]: