fix: keep local telemetry and display independent of monitor

2026-09-27 20:54:05 +08:00
parent 72f305dd98
commit 1b9b61bcbc
6 changed files with 105 additions and 27 deletions
@@ -0,0 +1,60 @@
+"""Read-only local telemetry; no dependency on the monitoring application."""
+import re
+import shutil
+import subprocess
+import time
+from pathlib import Path
+
+
+class LocalState:
+    def __init__(self):
+        self.previous_cpu=None
+        self.network_at=float('-inf')
+        self.network={'kind':'NET','metric':'--','ip_label':'IP4','ip':'NO IP'}
+
+    def cpu(self):
+        values=list(map(int,Path('/proc/stat').read_text().splitlines()[0].split()[1:9]))
+        current=(sum(values),values[3]+values[4]);previous=self.previous_cpu;self.previous_cpu=current
+        if previous is None:return None
+        total=current[0]-previous[0]
+        return max(0,min(100,100*(1-(current[1]-previous[1])/total))) if total>0 else None
+
+    @staticmethod
+    def memory():
+        values={line.split(':')[0]:int(line.split()[1]) for line in Path('/proc/meminfo').read_text().splitlines()}
+        return 100*(1-values['MemAvailable']/values['MemTotal'])
+
+    @staticmethod
+    def disk():
+        usage=shutil.disk_usage('/')
+        return 100*usage.used/usage.total
+
+    @staticmethod
+    def read_network():
+        for family,address,label in [('-4','1.1.1.1','IP4'),('-6','2606:4700:4700::1111','IP6')]:
+            # Route lookup only: does not send packets or change network configuration.
+            result=subprocess.run(['ip',family,'route','get',address],capture_output=True,text=True,timeout=1)
+            dev=re.search(r'\bdev\s+(\S+)',result.stdout);src=re.search(r'\bsrc\s+(\S+)',result.stdout)
+            if not dev:continue
+            iface=dev.group(1);wireless=Path('/sys/class/net',iface,'wireless').exists();metric='--'
+            if wireless:
+                for line in Path('/proc/net/wireless').read_text().splitlines():
+                    if line.lstrip().startswith(iface+':'):metric=str(float(line.split()[3].rstrip('.')));break
+            else:
+                try:metric=Path('/sys/class/net',iface,'speed').read_text().strip()
+                except OSError:metric='UP'
+            return {'kind':'WIF' if wireless else 'ETH','metric':metric,'ip_label':label,'ip':src.group(1) if src else 'NO IP'}
+        return {'kind':'NET','metric':'DOWN','ip_label':'IP4','ip':'NO IP'}
+
+    def sample(self):
+        system={};errors={}
+        for name,reader in [('cpu_percent',self.cpu),('memory_percent',self.memory),('disk_percent',self.disk),
+                            ('temperature_c',lambda:float(Path('/sys/class/thermal/thermal_zone0/temp').read_text())/1000)]:
+            try:system[name]=reader()
+            except (OSError,ValueError,KeyError,IndexError,ZeroDivisionError) as exc:system[name]=None;errors[name]=str(exc)
+        if time.monotonic()-self.network_at>=5:
+            try:self.network=self.read_network()
+            except (OSError,ValueError,subprocess.SubprocessError) as exc:
+                self.network={'kind':'NET','metric':'--','ip_label':'IP4','ip':'UNKNOWN'};errors['network']=str(exc)
+            self.network_at=time.monotonic()
+        return {'system':system,'network':dict(self.network)},errors