Add temperature course image

greenhouseui/app.py

@@ -1,6 +1,9 @@
 """Flask application for greenhouse"""
+from datetime import datetime, timedelta
 import json
 import logging
+import os
+import sys
 import xmlrpc.client
 
 from flask import Flask
@@ -9,6 +12,11 @@ from flask import make_response
 from flask import request
 from flask import jsonify
 
+import matplotlib
+matplotlib.use('Agg')
+import matplotlib.pyplot as plt
+import matplotlib.dates as mdates
+
 LOG_LEVEL = logging.INFO
 LOG_FILE = "/var/log/greenhouseui.log"
 LOG_FORMAT = "%(asctime)s %(levelname)s %(message)s"
@@ -17,16 +25,78 @@ HOST = "localhost"
 PORT = 64001
 URL = f"http://{HOST}:{PORT}"
 
-# logging.basicConfig(format=LOG_FORMAT, level=LOG_LEVEL, filename=LOG_FILE)
-logging.basicConfig(format=LOG_FORMAT, level=LOG_LEVEL)
+logging.basicConfig(format=LOG_FORMAT, level=LOG_LEVEL, filename=LOG_FILE)
+# logging.basicConfig(format=LOG_FORMAT, level=LOG_LEVEL)
 log = logging.getLogger()
 
+def get_image_install_path():
+    """Get the path where to install dynamically created images to"""
+    for path in sys.path:
+        try:
+            content = os.listdir(path)
+            if "greenhouseui" in content:
+                return os.path.join(path, "greenhouseui/static")
+        except FileNotFoundError:
+            pass
+    return None
+
+
+def draw_temperature_image():
+    temperature_dates = []
+    temperatures = []
+    with open("/var/log/gardencontrol.log", "r", encoding="UTF-8") as logfile:
+        for line in logfile:
+            line = line.strip()
+            if "Temperature" in line:
+                chunks = line.split(" ")
+                logtime = chunks[0] + " " + chunks[1]
+
+                logtime = datetime.strptime(logtime, "%Y-%m-%d %H:%M:%S,%f")
+                now = datetime.now()
+                start_time = now - timedelta(hours=24)
+                if logtime >= start_time:
+                    temperature_dates.append(logtime)
+
+                    temperature = float(chunks[4])
+                    temperatures.append(temperature)
+
+    background_color = "#282929"
+    color = "#b6b6b6"
+
+    fig, ax = plt.subplots(1)
+    fig.set_facecolor(background_color)
+
+    ax.set_facecolor(background_color)
+    ax.tick_params(axis="x", colors = color)
+    ax.tick_params(axis="y", colors = color)
+    ax.spines["top"].set_visible(False)
+    ax.spines["left"].set_visible(False)
+    ax.spines["bottom"].set_visible(False)
+    ax.spines["right"].set_visible(False)
+
+    # ax.set_ylabel("°C", rotation=0)
+    ax.yaxis.label.set_color(color)
+    fig.autofmt_xdate()
+    plt.plot(temperature_dates, temperatures, color=color)
+
+    xfmt = mdates.DateFormatter('%H:%M')
+    ax.xaxis.set_major_formatter(xfmt)
+
+    path = get_image_install_path()
+    if path:
+        img_file = os.path.join(path, "greenhouse_temperature.png")
+        if os.path.exists(img_file):
+            os.remove(img_file)
+        plt.savefig(img_file)
+    plt.close("all")
+
 
 app = Flask(__name__)
 
 @app.route('/', methods=['GET'])
 def index():
     """Handle GET to index.html"""
+    draw_temperature_image()
     return render_template('index.html')
 
 @app.route('/sample/<idx>', methods=['GET'])

greenhouseui/templates/index.html

@@ -14,8 +14,12 @@
             <tr>
                 <td><h3>Temperatur </h3></td>
                 <td><h3 id="temperature_value"></h3></td>
+                <td><h3> °C</h3></td>
             </tr>
         </table>
+        <div>
+            <img src="{{url_for('static', filename='greenhouse_temperature.png')}}"/>
+        </div>
         <table class="center">
             <tr>
                 <td class="table_left">Heizung</td>

setup.py

@@ -6,11 +6,11 @@ from setuptools import setup
 from setuptools.command.install import install
 
 NAME = 'Greenhouseui'
-VERSION = '1'
+VERSION = '2'
 AUTHOR = 'Thomas Klaehn'
 EMAIL = 'tkl@blackfinn.de'
 PACKAGES = ['greenhouseui']
-REQUIRES = ['Flask', 'gunicorn']
+REQUIRES = ['Flask', 'gunicorn', 'matplotlib']
 PACKAGE_DATA = {'greenhouseui': ['templates/*', 'static/css/*', 'static/scripts/*']}
 
 SERVICEDIR = "/lib/systemd/system"