Added /export route

influxgraph.py

@@ -3,6 +3,7 @@ import time
 import logging
 from colors import assign_colors_to_curves
 import json
+import io
 
 class InfluxGraph:
     """
@@ -162,6 +163,27 @@ class InfluxGraph:
             self.livemode = self.LIVE
             return dict(type='accept-graph', live=True)
 
+    def w_export(self, variables, time, interval):
+        """
+        Returns the bytes of a dataframe with the curves given by variables in the time range "time"
+        Called when the route /export is reached.
+
+        Parameters :
+            variables (str) : a comma separataed value string of variable names (influx names) to retrieve
+            time (str) : a commma separated value string (range) of seconds.
+            interval (str) : the interval (resolution) of the values to get (string in seconds)
+
+        Returns :
+            io.BytesIO : an BytesIO object containing the dataframe to retrieve
+        """
+        df = self.influx_data_getter.get_curves_data_frame(variables, time, interval)
+
+        mem = io.BytesIO()
+        mem.write(bytes(df.to_csv(sep="\t", index=False), "utf-8"))
+        mem.seek(0)
+
+        return mem
+
     def graphpoll(self):
         """
         Polls the last known values for all the available variables, and returns only those whose polled value is more recent than the nost recent displayed one.