Should complete POCONSOLE-77 for reading datalogger status and restarting

app/datalogger/views.py

@@ -1,5 +1,6 @@
 
 import os
+import subprocess
 from flask import Flask, render_template, request, session, send_from_directory, jsonify, url_for, flash, redirect, Response
 from werkzeug.utils import secure_filename
 from sqlalchemy import and_, desc
@@ -13,6 +14,7 @@ from pycomm_helper.utils import readTag, writeTag
 from random import random
 
 ALLOWED_EXTENSIONS = set(['txt', 'pdf', 'png', 'jpg', 'jpeg', 'gif', 'doc', 'docx', 'xls', 'xlsx', 'zip'])
+PID_FILE = '/root/datalogger.pid'
 
 
 def allowed_file(filename):
@@ -277,3 +279,28 @@ def restore_single(id):
     except:
         print("Error backing up tag value for tag {}".format(single_br['tag']))
     return jsonify(single_br)
+
+
+@app.route('/api/logger_status')
+def get_logger_status():
+    global PID_FILE
+    try:
+        with open(PID_FILE, 'rb') as pidfile:
+            pid = f.read()
+        os.kill(pid, 0)
+    except OSError:
+        return jsonify(False)
+    except IOError:
+        return jsonify(False)
+    else:
+        return jsonify(True)
+
+
+@app.route('/api/restart_logger')
+def restart_datalogger():
+    global PID_FILE
+    try:
+        subprocess.call(["service", "datalogger", "restart"], shell=False)
+    except Exception as e:
+        print("Exception during restart_datalogger: {}".format(e))
+    return get_logger_status()