From d8fb197876f30f8f539a9d8f0b7f0c0a77ec2752 Mon Sep 17 00:00:00 2001
From: David Vazgenovich Shakaryan <dvshakaryan@gmail.com>
Date: Mon, 19 Feb 2024 23:34:51 -0800
Subject: add network interface, cpu and memory modules

These are all refreshed from a shared thread. When the next update time
for multiple such modules overlaps, repainting the panel is triggered
only once.
---
 panel.py | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)

diff --git a/panel.py b/panel.py
index aad51eb..b67d2f2 100755
--- a/panel.py
+++ b/panel.py
@@ -3,9 +3,11 @@
 # Copyright 2024 David Vazgenovich Shakaryan
 
 import os
+import psutil
 import queue
 import subprocess
 import threading
+import time
 
 from datetime import datetime
 from zoneinfo import ZoneInfo
@@ -31,6 +33,10 @@ class Fmt:
     def label(cls, s):
         return cls.fg('#7b51ca', s)
 
+    @classmethod
+    def labelled(cls, label, s):
+        return cls.label(label) + cls.spacer() + s
+
     @classmethod
     def spacer(cls, n=1):
         return f'%{{O{n * 7}}}'
@@ -298,6 +304,63 @@ class ModInputAvail(Mod):
             self.out = None
         self.repaint()
 
+class IntervalTimer():
+    def __init__(self):
+        self.t = None
+        self.lock = threading.Lock()
+        self.func_intervals = {}
+        self.func_next_time = {}
+        self.e_repaint = None
+
+    def run(self):
+        with self.lock:
+            if self.t is None:
+                self.t = threading.Thread(target=self.work, daemon=True)
+                self.t.start()
+
+    def work(self):
+        while True:
+            now = time.time()
+            for func, ival in self.func_intervals.items():
+                if now > self.func_next_time.get(func, 0):
+                    func()
+                    self.func_next_time[func] = now - (now % ival) + ival
+            self.e_repaint.set()
+            time.sleep(min(self.func_next_time.values()) - time.time())
+
+class ModInterval(Mod):
+    timer = IntervalTimer()
+
+    def __init__(self, interval=1, **kwargs):
+        super().__init__(**kwargs)
+        self.timer.func_intervals[self.refresh] = interval
+
+    def run(self):
+        if not self.timer.e_repaint:
+            self.timer.e_repaint = self.e_repaint
+        self.timer.run()
+
+class ModNetIf(ModInterval):
+    def __init__(self, ifname, label=None, **kwargs):
+        super().__init__(**kwargs)
+        self.ifname = ifname
+        self.label = label or ifname
+
+    def refresh(self):
+        stats = psutil.net_if_stats().get(self.ifname)
+        state = 'up' if stats and stats.isup else 'down'
+        self.out = Fmt.labelled(self.label, state)
+
+class ModCPU(ModInterval):
+    def refresh(self):
+        percent = psutil.cpu_percent()
+        self.out = Fmt.labelled('CPU', f'{percent:.0f}%%')
+
+class ModMem(ModInterval):
+    def refresh(self):
+        percent = psutil.virtual_memory().percent
+        self.out = Fmt.labelled('MEM', f'{percent:.0f}%%')
+
 class Panel:
     def __init__(self, *mods):
         self.e_repaint = threading.Event()
@@ -347,6 +410,9 @@ Panel(
     ModInputAvail(
         '/dev/input/by-id/usb-HID_Keyboard_HID_Keyboard-event-kbd',
         unavail_text='NO KEYBOARD'),
+    ModNetIf('wg0', interval=1),
+    ModCPU(interval=0.5),
+    ModMem(interval=0.5),
     ModDate(
         fmts=('%Y-%m-%d %H:%M:%S', '%H:%M'),
         tzs=({'id': None}, {'id': 'UTC'},
-- 
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