Add basic instrumentation possibilities to pretix (#271)

* add basic instrumentation possibilities to pretix * make tabs to spaces * apply flake8 * implement upstreams suggestions, round 1 * adjust naming of redis-connection * address noredis * add view for metrics * implement HTTP basic auth in front of metrics-endpoint * rename labelset * make flake8-clean * implement upstreams suggestions, round 2 * correct minor slipups * fix missing return * let isort add an empty line * implement test for counter * implement upstream suggestions, round 3 * correct typo * implement first test for view * finish view-test * fix deprecated keyword * implement upstream-suggestions, round 4 * implement test for gauge * test exceptions as well * add db-decorator
2016-11-20 14:46:45 +01:00
parent d308821c4c
commit d3327b1e45
6 changed files with 354 additions and 1 deletions
--- a/src/pretix/base/views/metrics.py
+++ b/src/pretix/base/views/metrics.py
@@ -0,0 +1,43 @@
+from django.conf import settings
+from django.http import HttpResponse
+
+from .. import metrics
+
+
+def unauthed_response():
+    content = "<html><title>Forbidden</title><body>You are not authorized to view this page.</body></html>"
+    response = HttpResponse(content, content_type="text/html")
+    response["WWW-Authenticate"] = 'Basic realm="metrics"'
+    response.status_code = 401
+    return response
+
+
+def serve_metrics(request):
+    if not settings.METRICS_ENABLED:
+        return unauthed_response()
+
+    # check if the user is properly authorized:
+    if "HTTP_AUTHORIZATION" not in request.META:
+        return unauthed_response()
+
+    method, credentials = request.META["HTTP_AUTHORIZATION"].split(" ", 1)
+    if method.lower() != "basic":
+        return unauthed_response()
+
+    user, passphrase = credentials.strip().decode("base64").split(":", 1)
+
+    if user != settings.METRICS_USER:
+        return unauthed_response()
+    if passphrase != settings.METRICS_PASSPHRASE:
+        return unauthed_response()
+
+    # ok, the request passed the authentication-barrier, let's hand out the metrics:
+    m = metrics.metric_values()
+
+    output = []
+    for metric, value in m:
+        output.append("{} {}".format(metric, str(value)))
+
+    content = "\n".join(output)
+
+    return HttpResponse(content)