Add garmin data scraper on a timer

modules/services/default.nix

@@ -6,6 +6,7 @@
     ./containers
     ./data-access
     ./deluge
+    ./garmin-scraper
     ./grafana
     ./mail
     ./matrix

modules/services/garmin-scraper/default.nix

@@ -0,0 +1,37 @@
+{ config, lib, pkgs, ... }:
+
+let
+  garmin2influx = pkgs.writers.writePython3Bin "garmin2influx" {
+    libraries = with pkgs.python3Packages; [ garminconnect influxdb-client ];
+  } (builtins.readFile ./garmin2influx.py);
+in
+{
+  options.chvp.services.garmin-scraper.enable = lib.mkEnableOption "garmin scraper";
+
+  config = lib.mkIf config.chvp.services.garmin-scraper.enable {
+    # Install in environment to allow manual data collection
+    environment.systemPackages = [ garmin2influx ];
+    systemd = {
+      services.garmin2influx = {
+        description = "Garmin health data importer";
+        restartIfChanged = false;
+        unitConfig.X-StopOnRemoval = false;
+        serviceConfig = {
+          EnvironmentFile = config.age.secrets."passwords/services/garmin2influx-env".path;
+          Type = "oneshot";
+          User = "charlotte";
+          Group = "users";
+          ExecStart = "${garmin2influx}/bin/garmin2influx";
+          RestartSec = "5s";
+          Restart = "on-failure";
+        };
+        startAt = "02/4:00";
+      };
+      timers.garmin2influx.timerConfig.RandomizedDelaySec = "30min";
+    };
+    age.secrets."passwords/services/garmin2influx-env" = {
+      file = ../../../secrets/passwords/services/garmin2influx-env.age;
+      owner = "charlotte";
+    };
+  };
+}

modules/services/garmin-scraper/garmin2influx.py

@@ -0,0 +1,66 @@
+import os
+import sys
+from datetime import date, datetime, timedelta, timezone
+from garminconnect import (
+    Garmin,
+    GarminConnectConnectionError,
+    GarminConnectTooManyRequestsError,
+    GarminConnectAuthenticationError,
+    )
+from influxdb_client import InfluxDBClient, Point, WritePrecision
+from influxdb_client.client.write_api import SYNCHRONOUS
+
+email = os.getenv('EMAIL')
+password = os.getenv('PASSWORD')
+token = os.getenv('TOKEN')
+org = 'default'
+bucket = 'default'
+
+
+def hr2point(time, val):
+    return Point("health") \
+      .field("heart_rate", val) \
+      .time(
+          datetime.fromtimestamp(time / 1000, timezone.utc),
+          WritePrecision.S
+      )
+
+
+def hr_for_date(api, date_to_fetch):
+    return api.get_heart_rates(date_to_fetch.isoformat())['heartRateValues']
+
+
+date_to_fetch = date.today().isoformat()
+if len(sys.argv) > 1:
+    date_to_fetch = sys.argv[1]
+
+date_to_fetch = date.fromisoformat(date_to_fetch)
+
+try:
+    api = Garmin(email, password)
+    api.login()
+    points = list(map(
+        lambda p: hr2point(*p),
+        hr_for_date(api, date_to_fetch - timedelta(days=1))
+        ))
+    points += list(map(
+        lambda p: hr2point(*p),
+        hr_for_date(api, date_to_fetch)
+        ))
+    with InfluxDBClient(
+        url="https://stats.chvp.be:8086",
+        token=token,
+        org=org
+    ) as client:
+        write_api = client.write_api(write_options=SYNCHRONOUS)
+        write_api.write(bucket, org, points)
+except (
+    GarminConnectConnectionError,
+    GarminConnectAuthenticationError,
+    GarminConnectTooManyRequestsError,
+) as err:
+    print(
+        f'Error occured during Garmin Connect communication: {err}',
+        file=sys.stderr
+        )
+    sys.exit(1)