split out config file reading

+ improve ip and no 'network' on display

utils.py

@@ -0,0 +1,98 @@
+import os
+import socket
+import threading
+from glob import glob
+from configparser import ConfigParser
+from netifaces import interfaces, ifaddresses, gateways, AF_INET, AF_LINK
+
+
+ifname_mapping = {
+   'eth0': 'enp1s0',
+   'eth1': 'enp2s0',
+   'eth2': 'enp3s0',
+   'eth3': 'enp4s0',
+}
+
+
+if os.geteuid():
+    def sudo(cmd):
+        os.system(f'sudo {cmd}')
+else:
+    def sudo(cmd):
+        os.system(cmd)
+
+
+def get_config(section=None):
+    """get content of box configuration
+
+    :param section: if not None, return only given section
+    :return: configuration as dict
+    """
+    parser = ConfigParser()
+    cfgfiles = glob('/home/l_samenv/boxtools/cfg/%s_*.cfg' % socket.gethostname())
+    if len(cfgfiles) != 1:
+        raise ValueError('there must be one and only one single cfgfile %r' % cfgfiles)
+    parser.read(cfgfiles[0])
+    try:
+        result = {k: dict(parser[k]) for k in ([section] if section else parser.sections())}
+    except KeyError:
+        return {}
+    network = result.get('NETWORK', {})
+    for name in list(network):
+        network[ifname_mapping.get(name, name)] = network.pop(name)
+    if section:
+        return result[section]
+    return result
+
+
+class MainIf:
+    address = None
+    ip = None
+    gateway = None
+    hostname = None
+    carrier = True
+
+    def __init__(self):
+        netcfg = get_config('NETWORK')
+        for name, key in netcfg.items():
+            if key.startswith(('dhcp', 'wan')):
+                self.name = name
+            break
+        else:
+            # take first one (alphabetically)
+            self.name = sorted(netcfg)[0]
+        self.getip()
+
+    def gethostthread(self, ip, event):
+        try:
+            hostname = socket.gethostbyaddr(ip)[0]
+            if event == self.event:
+                self.hostname = hostname
+        except Exception as e:
+            pass
+        event.set()
+
+    def getip(self):
+        with open(f'/sys/class/net/{self.name}/carrier') as f:
+            carrier = f.read().startswith('1')
+        if carrier > self.carrier:
+            sudo(f'dhclient -r {self.name}')
+            sudo(f'dhclient {self.name}')
+        self.carrier = carrier
+        addrinfo = ifaddresses(self.name)
+        self.address = addrinfo.get(AF_LINK, [{}])[0].get('addr') 
+        if carrier:
+            self.ip = addrinfo.get(AF_INET, [{}])[0].get('addr') 
+            self.gateway = gateways().get('default', {}).get(AF_INET) if self.ip else None
+        else:
+            self.ip = None
+            self.gateway = None
+            self.hostname = None
+        if self.carrier and self.ip and self.gateway:
+            self.event = event = threading.Event()
+            result = []
+            threading.Thread(target=self.gethostthread, args=(self.ip, event), daemon=True).start()
+            event.wait(0.1)
+        else:
+            self.event = None  # disable changing hostname from pending threads
+        return self.ip