Started basic rescue script

openflexure_microscope/rescue/monitor_service.py

@@ -0,0 +1,59 @@
+#!/bin/python
+#
+# Copyright 2016 Flavio Garcia
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Usage: monitor_process.py <service_name>
+#
+# Example(crontab, every 5 minutes):
+# */5 * * * * /root/bin/monitor_service.py prosody > /dev/null 2>&1
+#
+
+import sys
+import subprocess
+
+
+class ServiceMonitor(object):
+    def __init__(self, service):
+        self.service = service
+
+    def is_active(self):
+        """Return True if service is running"""
+        for line in self.status():
+            if "Active:" in line:
+                if "(running)" in line:
+                    return True
+        return False
+
+    def status(self):
+        cmd = f"/bin/systemctl status {self.service}.service"
+        proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
+        stdout_list = proc.communicate()[0].decode().split("\n")
+        return stdout_list
+
+    def start(self):
+        cmd = f"/bin/systemctl start {self.service}.service"
+        proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
+        proc.communicate()
+
+    def stop(self):
+        cmd = f"/bin/systemctl stop {self.service}.service"
+        proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
+        proc.communicate()
+
+    def log(self, n_lines: int = 100):
+        cmd = f"/bin/journalctl -u {self.service}.service -n {n_lines} --no-pager"
+        proc = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
+        stdout_list = proc.communicate()[0].decode().split("\n")
+        return stdout_list