Add HTTPServer and PingableSystem to dashboad.system and add an example.

dashboard/system.py

@@ -1,7 +1,14 @@
 # Copyright (c) 2025, Julian Müller (ChaoticByte)
 
 
+# additional libraries
+
+import platform
+import requests
+import subprocess
+
 from enum import Enum
+from typing import Tuple
 
 
 # base classes and types and stuff
@@ -28,3 +35,51 @@ class System:
         # to be overridden
         self.state = SystemState.UNKNOWN
         self.state_verbose = ""
+
+
+# some basic systems
+
+
+class PingableSystem(System):
+
+    def __init__(self, name, description, host: str):
+        super().__init__(name, description)
+        self.host = host
+
+    def ping(self) -> Tuple[bool, str, str]:
+        if platform.system().lower() == "windows": p = "-n"
+        else: p = "-c"
+        s = subprocess.run(["ping", p, '1', self.host], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+        return s.returncode == 0, s.stdout.decode(), s.stderr.decode()
+
+    def update_state(self):
+        self.state = SystemState.UNKNOWN
+        ok, stdout, stderr = self.ping()
+        if ok:
+            self.state = SystemState.OK
+            self.state_verbose = stdout
+        else:
+            self.state = SystemState.FAILED
+            self.state_verbose = stdout + "\n" + stderr
+
+
+class HTTPServer(System):
+
+    def __init__(self, name, description, url: str, expected_status_code: int = 200, allow_self_signed_cert: bool = False):
+        super().__init__(name, description)
+        self.url = url
+        self.expected_status = expected_status_code
+        self.allow_self_signed_cert = allow_self_signed_cert
+
+    def update_state(self):
+        self.state = SystemState.UNKNOWN
+        try:
+            r = requests.head(self.url, timeout=1.0, verify=not self.allow_self_signed_cert)
+            if r.status_code == 200:
+                self.state = SystemState.OK
+            else:
+                self.state = SystemState.FAILED
+            self.state_verbose = f"Status {r.status_code} {r.url}"
+        except requests.ConnectionError as e:
+            self.state = SystemState.FAILED
+            self.state_verbose = f"Exception: {str(e)}"

example.py

@@ -3,7 +3,7 @@
 
 from nicegui import ui
 
-from dashboard.system import System, SystemState
+from dashboard.system import HTTPServer, System, SystemState
 from dashboard.ui import init_ui
 
 
@@ -50,7 +50,7 @@ systems = [
     "Example Heading 1",
     ExampleSystem("Example System 1", "Description text ..."),
     "Example Heading 2",
-    ExampleSystem("Example System 2", "Another description text ...")
+    HTTPServer("example.org", "The example.org HTTP server.", "https://example.org/")
 ]
 
 #