Add first server alerts, improve UI a bit.

alerts/dummy.py

@@ -0,0 +1,18 @@
+from helpers.alert_manager import AlertProvider
+from package import BETA
+from baps_types.alert import WARNING, Alert
+# Dummy alert provider for testing basics like UI without needing to actually cause errors.
+class DummyAlertProvider(AlertProvider):
+
+  def get_alerts(self):
+    if BETA:
+      return [Alert(
+        {
+          "start_time": -1,
+          "id": "test",
+          "title": "BAPSicle is in Debug Mode",
+          "description": "This is a test alert. It will not appear on production builds.",
+          "module": "Test",
+          "severity": WARNING
+        }
+      )]

alerts/server.py

@@ -0,0 +1,72 @@
+# Any alerts produced by the server.py layer. This likely means BIG issues.
+import json
+from typing import Any, Dict, List
+from datetime import datetime, timedelta
+from helpers.os_environment import resolve_external_file_path
+from helpers.alert_manager import AlertProvider
+from baps_types.alert import CRITICAL, WARNING, Alert
+
+MODULE = "BAPSicleServer" # This should match the log file, so the UI will link to the logs page.
+
+class ServerAlertProvider(AlertProvider):
+
+  _state: Dict[str, Any]
+  # To simplify monitoring (and allow detection of things going super weird), we are going to read from the state file to work out the alerts.
+  def get_alerts(self):
+    with open(resolve_external_file_path("state/BAPSicleServer.json")) as file:
+      self._state = json.loads(file.read())
+
+
+    funcs = [self._api_key, self._start_time]
+
+    alerts: List[Alert] = []
+
+    for func in funcs:
+      func_alerts = func()
+      if func_alerts:
+        alerts.extend(func_alerts)
+
+    return alerts
+
+  def _api_key(self):
+    if not self._state["myradio_api_key"]:
+      return [Alert({
+        "start_time": -1, # Now
+        "id": "api_key_missing",
+        "title": "MyRadio API Key is not configured.",
+        "description": "This means you will be unable to load show plans, audio items, or tracklist. Please set one on the 'Server Config' page.",
+        "module": MODULE,
+        "severity": CRITICAL
+      })]
+
+    if len(self._state["myradio_api_key"]) < 10:
+      return [Alert({
+        "start_time": -1,
+        "id": "api_key_missing",
+        "title": "MyRadio API Key seems incorrect.",
+        "description": "The API key is less than 10 characters, it's probably not a valid one. If it is valid, it shouldn't be.",
+        "module": MODULE,
+        "severity": WARNING
+      })]
+
+  def _start_time(self):
+    start_time = self._state["start_time"]
+    start_time = datetime.fromtimestamp(start_time)
+    delta = timedelta(
+      days=1,
+    )
+    if (start_time + delta > datetime.now()):
+      return [Alert({
+        "start_time": -1,
+        "id": "server_restarted",
+        "title": "BAPSicle restarted recently.",
+        "description":
+"""The BAPSicle server restarted at {}, less than a day ago.
+
+It may have been automatically restarted by the OS.
+
+If this is not expected, please check logs to investigate why BAPSicle restarted/crashed."""
+        .format(str(start_time).rsplit(".",1)[0]),
+        "module": MODULE,
+        "severity": WARNING
+      })]

helpers/alert_manager.py

@@ -1,29 +1,78 @@
-from typing import List
+from typing import Any, List
+
+#Magic for importing alert providers from alerts directory.
+from pkgutil import iter_modules
+from importlib import import_module
+from inspect import getmembers,isclass
+from sys import modules
+
 from baps_types.alert import CRITICAL, Alert
+import alerts
+
+def iter_namespace(ns_pkg):
+    # Specifying the second argument (prefix) to iter_modules makes the
+    # returned name an absolute name instead of a relative one. This allows
+    # import_module to work without having to do additional modification to
+    # the name.
+    return iter_modules(ns_pkg.__path__, ns_pkg.__name__ + ".")
+
+
+class AlertProvider():
+
+  def __init__(self):
+    return None
+
+  def get_alerts(self):
+    return []
 
 class AlertManager():
   _alerts: List[Alert]
+  _providers: List[AlertProvider] = []
 
   def __init__(self):
-    self._alerts = [Alert(
-      {
-        "start_time": -1,
-        "id": "test",
-        "title": "Test Alert",
-        "description": "This is a test alert.",
-        "module": "Test",
-        "severity": CRITICAL
+    self._alerts = []
+
+    # Find all the alert providers from the /alerts/ directory.
+    providers = {
+        name: import_module(name)
+        for _, name, _
+        in iter_namespace(alerts)
     }
-    )]
+
+    for provider in providers:
+      classes: List[Any] = [mem[1] for mem in getmembers(modules[provider], isclass) if mem[1].__module__ == modules[provider].__name__]
+
+      if (len(classes) != 1):
+        print(classes)
+        raise Exception("Can't import plugin " + provider + " because it doesn't have 1 class.")
+
+      self._providers.append(classes[0]())
+
+
+    print("Discovered alert providers: ", self._providers)
+
+  def poll_alerts(self):
+
+    # Poll modules for any alerts.
+    alerts: List[Alert] = []
+    for provider in self._providers:
+      provider_alerts = provider.get_alerts()
+      if provider_alerts:
+        alerts.extend(provider_alerts)
+
+    self._alerts = alerts
 
   @property
   def alerts_current(self):
+    self.poll_alerts()
     return self._alerts
 
   @property
   def alert_count_current(self):
+    self.poll_alerts()
     return len(self._alerts)
 
   @property
   def alert_count_previous(self):
+    self.poll_alerts()
     return len(self._alerts)

server.py

@@ -12,6 +12,7 @@
     Date:
         October, November 2020
 """
+from datetime import datetime
 from file_manager import FileManager
 import multiprocessing
 from multiprocessing.queues import Queue
@@ -224,6 +225,7 @@ class BAPSicleServer:
         )
 
         self.state.update("running_state", "running")
+        self.state.update("start_time", datetime.now().timestamp())
 
         print("Launching BAPSicle...")
 

ui-templates/alerts.html

@@ -1,6 +1,6 @@
 {% extends 'base.html' %}
 {% block head %}
-<meta http-equiv="refresh" content="2;url=/alerts" />
+<meta http-equiv="refresh" content="15;url=/alerts" />
 {% endblock %}
 {% block content_inner %}
   {% if data %}
@@ -25,8 +25,10 @@
 
       <div id="collapseOne" class="collapse show" aria-labelledby="headingOne" data-parent="#accordionExample">
         <div class="card-body">
-          <strong>Module: </strong>{{ alert.module }}<br>
-          {{ alert.description }}
+          <strong>Module: </strong><a href="/logs/{{ alert.module }}" title="Click for logs">{{ alert.module }}</a>
+          {% autoescape false %}
+          <p>{{ alert.description | replace("\n\n", "</p><p>") | replace("\n", "<br/>")}}</p>
+          {% endautoescape %}
         </div>
       </div>
     </div>

ui-templates/index.html

@@ -1,6 +1,6 @@
 {% extends 'base.html' %}
 {% block head %}
-<meta http-equiv="refresh" content="2;url=/" />
+<meta http-equiv="refresh" content="60;url=/" />
 {% endblock %}
 {% block content %}