feat: add traceparent propagation via headers and meta tag

Author: NGPixel

ietf/context_processors.py

@@ -5,6 +5,7 @@
 from django.conf import settings
 from django.utils import timezone
 from ietf import __version__, __patch__, __release_branch__, __release_hash__
+from opentelemetry.propagate import inject
 
 def server_mode(request):
     return {'server_mode': settings.SERVER_MODE}
@@ -51,3 +52,8 @@ def timezone_now(request):
     return {
         'timezone_now': timezone.now(),
     }
+
+def traceparent_id(request):
+    context_extras = {}
+    inject(context_extras)
+    return context_extras

ietf/middleware.py

@@ -8,6 +8,7 @@
 from django.http import HttpResponsePermanentRedirect
 from ietf.utils.log import log, exc_parts
 from ietf.utils.mail import log_smtp_exception
+from opentelemetry.propagate import inject
 import re
 import smtplib
 import unicodedata
@@ -99,3 +100,12 @@ def add_header(request):
         return response
 
     return add_header
+
+def add_otel_traceparent_header(get_response):
+    """Middleware to add the OpenTelemetry traceparent id header to the response"""
+    def add_header(request):
+        response = get_response(request)
+        inject(response)
+        return response
+
+    return add_header

ietf/settings.py

@@ -411,6 +411,7 @@ def skip_unreadable_post(record):
         ],
         'OPTIONS': {
             'context_processors': [
+                'ietf.context_processors.traceparent_id',
                 'django.contrib.auth.context_processors.auth',
                 'django.template.context_processors.debug',     # makes 'sql_queries' available in templates
                 'django.template.context_processors.i18n',
@@ -443,6 +444,7 @@ def skip_unreadable_post(record):
 
 
 MIDDLEWARE = [
+    "ietf.middleware.add_otel_traceparent_header",
     "django.middleware.csrf.CsrfViewMiddleware",
     "corsheaders.middleware.CorsMiddleware", # see docs on CORS_REPLACE_HTTPS_REFERER before using it
     "django.middleware.common.CommonMiddleware",

ietf/templates/base.html

@@ -15,6 +15,7 @@
             {% block title %}No title{% endblock %}
         </title>
         <meta name="viewport" content="width=device-width, initial-scale=1">
+        <meta name="traceparent" content="{{ traceparent }}">
         <link href="{{ settings.STATIC_IETF_ORG }}/fonts/inter/import.css" rel="stylesheet">
         <link href="{{ settings.STATIC_IETF_ORG }}/fonts/noto-sans-mono/import.css" rel="stylesheet">
         <link rel="stylesheet" href="{% static 'ietf/css/ietf.css' %}">