YDA-5840 add monitoring thread to portal

Add monitoring thread to the Yoda portal for collecting technical
support information in case of problems.

app.py

@@ -19,6 +19,7 @@
 from general.general import general_bp
 from group_manager.group_manager import group_manager_bp
 from intake.intake import intake_bp
+from monitor import Monitor
 from open_search.open_search import open_search_bp
 from research.research import research_bp
 from search.search import search_bp
@@ -119,6 +120,13 @@ def load_admin_config():
 # Start Flask-Session
 Session(app)
 
+# Start monitoring thread for extracting tech support information
+with app.app_context():
+    # Monitor signal file can be set to empty to completely disable monitor thread.
+    if app.config.get("MONITOR_SIGNAL_FILE", "/var/www/yoda/show-tech.sig") != "":
+        monitor_thread = Monitor(app.config)
+        monitor_thread.start()
+
 # Register blueprints
 with app.app_context():
     app.register_blueprint(general_bp)

monitor.py

@@ -0,0 +1,83 @@
+#!/usr/bin/env python3
+
+"""This class implements a monitoring thread that can be used to collect technical
+   support information in case of problems with the portal."""
+
+__copyright__ = 'Copyright (c) 2021-2024, Utrecht University'
+__license__   = 'GPLv3, see LICENSE'
+
+import os
+import socket
+import sys
+import traceback
+from datetime import datetime
+from io import StringIO
+from threading import Timer
+
+import flask
+import humanize
+import psutil
+
+
+class Monitor(Timer):
+
+    def __init__(self, config: flask.config.Config):
+        self.interval = 1
+        self.config = config
+        Timer.__init__(self, self.interval, self.record_info_if_needed)
+
+    def get_signal_file(self) -> str:
+        return self.config.get("MONITOR_SIGNAL_FILE", "/var/www/yoda/show-tech.sig")
+
+    def get_output_dir(self) -> str:
+        return self.config.get("MONITOR_OUTPUT_DIR", "/tmp")
+
+    def get_yoda_version(self) -> str:
+        return "{} ({})".format(self.config.get("YODA_VERSION", "N/A"),
+                                self.config.get("YODA_COMMIT", "N/A"))
+
+    def record_info_if_needed(self):
+        while not self.finished.wait(self.interval):
+            if os.path.isfile(self.get_signal_file()):
+                output_file = os.path.join(self.get_output_dir(),
+                                           datetime.now().strftime("yoda-portal-showtech-%d-%m-%Y-%H-%M-%S-%f.txt"))
+                with open(output_file, "w") as output:
+                    tshoot_info = self.get_tshoot_info()
+                    output.write(tshoot_info.getvalue())
+
+    def get_tshoot_info(self) -> StringIO:
+        output = StringIO()
+        date_string = datetime.now().strftime("%d/%m/%Y at %H:%M:%S.%f")
+        hostname = socket.getfqdn()
+        yoda_version = self.get_yoda_version()
+        output.write(f"Portal tech support info for {hostname}, collected on {date_string}\n")
+        output.write(f"Yoda version, as per portal config: {yoda_version}\n\n")
+
+        cpu_percent = str(psutil.cpu_percent()) + "%"
+        mem_total = humanize.naturalsize(psutil.virtual_memory().total)
+        mem_available = humanize.naturalsize(psutil.virtual_memory().available)
+        mem_buffers = humanize.naturalsize(psutil.virtual_memory().buffers)
+        mem_cached = humanize.naturalsize(psutil.virtual_memory().cached)
+        mem_info = psutil.Process().memory_info()
+        mem_rss = humanize.naturalsize(mem_info.rss)
+        mem_vms = humanize.naturalsize(mem_info.vms)
+        mem_shared = humanize.naturalsize(mem_info.shared)
+        output.write(f"System-wide CPU percent:         {cpu_percent}\n")
+        output.write(f"Memory: global total:            {mem_total}\n")
+        output.write(f"Memory: global available:        {mem_available}\n")
+        output.write(f"Memory: global buffers:          {mem_buffers}\n")
+        output.write(f"Memory: global cached:           {mem_cached}\n")
+        output.write(f"Memory: process RSS:             {mem_rss}\n")
+        output.write(f"Memory: process VMS:             {mem_vms}\n")
+        output.write(f"Memory: process shared:          {mem_shared}\n")
+
+        output.write("\n")
+
+        for thread_id, stack in sys._current_frames().items():
+            output.write(f"Thread ID: {thread_id}\n")
+            for filename, line_number, function_name, line in traceback.extract_stack(stack):
+                output.write(f"  {filename}:{line_number} [{function_name}]\n")
+                output.write(f"     {line}\n" if line else "")
+            output.write("\n")
+
+        return output

requirements.txt

@@ -10,3 +10,5 @@ irods-avu-json==2.2.0
 MarkupSafe==2.1.5
 python-magic==0.4.27
 Werkzeug==3.0.3
+psutil==6.0.0
+humanize==4.10.0

setup.cfg

@@ -4,7 +4,7 @@ import-order-style=smarkets
 strictness=short
 docstring_style=sphinx
 max-line-length=127
-application-import-names=admin,api,connman,errors,fileviewer,general,group_manager,research,search,open_search,stats,user,vault,deposit,intake,datarequest,util
+application-import-names=admin,api,connman,errors,fileviewer,general,group_manager,monitor,research,search,open_search,stats,user,vault,deposit,intake,datarequest,util
 exclude=venv
 
 [mypy]