From d7d4537408ef81537483674bce001fbc2d844395 Mon Sep 17 00:00:00 2001
From: Mika <kontakt@donau2space.de>
Date: Sun, 5 Apr 2026 02:07:39 +0000
Subject: [PATCH] Add
 magnetometer_data_logger/src/magnetometer_data_logger/main.py

---
 .../src/magnetometer_data_logger/main.py      | 103 ++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 magnetometer_data_logger/src/magnetometer_data_logger/main.py

diff --git a/magnetometer_data_logger/src/magnetometer_data_logger/main.py b/magnetometer_data_logger/src/magnetometer_data_logger/main.py
new file mode 100644
index 0000000..0f9ba27
--- /dev/null
+++ b/magnetometer_data_logger/src/magnetometer_data_logger/main.py
@@ -0,0 +1,103 @@
+import json
+import os
+import argparse
+from datetime import datetime
+from dataclasses import dataclass, asdict
+from typing import Any
+
+
+@dataclass
+class SensorData:
+    """Repräsentiert einen einzelnen Datensatz einer Magnetometer-Messung."""
+
+    timestamp: datetime
+    Bx: float
+    By: float
+    Bz: float
+    temperature: float
+    humidity: float
+
+    def to_serializable(self) -> dict[str, Any]:
+        """Gibt eine JSON-serielle Repräsentation des Datensatzes zurück."""
+        return {
+            "timestamp": self.timestamp.isoformat(),
+            "Bx": self.Bx,
+            "By": self.By,
+            "Bz": self.Bz,
+            "temperature": self.temperature,
+            "humidity": self.humidity,
+        }
+
+    @classmethod
+    def from_dict(cls, data: dict[str, Any]) -> 'SensorData':
+        """Validiert und erstellt ein SensorData-Objekt aus einem Dictionary."""
+        required_fields = {"timestamp", "Bx", "By", "Bz", "temperature", "humidity"}
+        missing = required_fields - data.keys()
+        if missing:
+            raise ValueError(f"Fehlende Felder in SensorData: {', '.join(missing)}")
+
+        try:
+            timestamp = (
+                datetime.fromisoformat(data["timestamp"])
+                if isinstance(data["timestamp"], str)
+                else data["timestamp"]
+            )
+            Bx = float(data["Bx"])
+            By = float(data["By"])
+            Bz = float(data["Bz"])
+            temperature = float(data["temperature"])
+            humidity = float(data["humidity"])
+        except (ValueError, TypeError) as e:
+            raise ValueError(f"Ungültige Datentypen in SensorData: {e}") from e
+
+        return cls(timestamp=timestamp, Bx=Bx, By=By, Bz=Bz, temperature=temperature, humidity=humidity)
+
+
+def log_data(sensor_data: SensorData, output_path: str = "output/magnetometer_log.json") -> None:
+    """Schreibt Sensordaten in eine JSON-Logdatei."""
+    assert isinstance(sensor_data, SensorData), "sensor_data muss eine Instanz von SensorData sein."
+    assert isinstance(output_path, str) and output_path.strip(), "output_path muss ein gültiger Pfad sein."
+
+    log_entry = sensor_data.to_serializable()
+
+    os.makedirs(os.path.dirname(output_path), exist_ok=True)
+
+    existing_data = []
+    if os.path.exists(output_path):
+        with open(output_path, 'r', encoding='utf-8') as file:
+            try:
+                existing_data = json.load(file)
+                if not isinstance(existing_data, list):
+                    existing_data = []
+            except json.JSONDecodeError:
+                existing_data = []
+
+    existing_data.append(log_entry)
+
+    with open(output_path, 'w', encoding='utf-8') as file:
+        json.dump(existing_data, file, indent=2)
+
+
+def _parse_args() -> argparse.Namespace:
+    parser = argparse.ArgumentParser(description="Magnetometer Data Logger")
+    parser.add_argument(
+        "--output",
+        required=True,
+        help="Pfad zur Ausgabedatei, in der die Magnetometerdaten gespeichert werden.",
+    )
+    return parser.parse_args()
+
+
+def main() -> None:
+    args = _parse_args()
+    try:
+        input_json = json.load(os.sys.stdin)
+        sensor_data = SensorData.from_dict(input_json)
+        log_data(sensor_data, args.output)
+    except Exception as exc:
+        os.sys.stderr.write(f"Fehler beim Verarbeiten der Sensordaten: {exc}\n")
+        os.sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()
\ No newline at end of file