[IMPROVEMENT] Add proxy for /api/v1/labels

promgen/proxy.py

@@ -78,7 +78,24 @@ def get_context_data(self, **kwargs):
         return context
 
 
-class ProxyLabel(PrometheusProxy):
+class ProxyLabels(PrometheusProxy):
+    def get(self, request):
+        data = set()
+        for future in self.proxy(request):
+            try:
+                result = future.result()
+                result.raise_for_status()
+                _json = result.json()
+                logger.debug("Appending data from %s", result.url)
+                data.update(_json["data"])
+            except HTTPError:
+                logger.warning("Error with response")
+                return proxy_error(result)
+
+        return JsonResponse({"status": "success", "data": sorted(data)})
+
+
+class ProxyLabelValues(PrometheusProxy):
     def get(self, request, label):
         data = set()
         for future in self.proxy(request):

promgen/templates/promgen/rule_form_block.html

@@ -90,7 +90,7 @@
   <div class="panel-body">
       <select
         data-target="#id_clause"
-        data-ajax="{% url 'proxy-label' '__name__' %}"
+        data-ajax="{% url 'proxy-values' '__name__' %}"
         data-append='{% templatetag openbrace %}{{rule.content_type.name}}="{{ rule.content_object.name }}"}'
         class="form-control"
         >

promgen/urls.py

@@ -115,7 +115,8 @@
     # Prometheus Proxy
     # these apis need to match the same path because Promgen can pretend to be a Prometheus API
     path("graph", proxy.ProxyGraph.as_view()),
-    path("api/v1/label/<label>/values", proxy.ProxyLabel.as_view(), name="proxy-label"),
+    path("api/v1/labels", proxy.ProxyLabels.as_view(), name="proxy-label"),
+    path("api/v1/label/<label>/values", proxy.ProxyLabelValues.as_view(), name="proxy-values"),
     path("api/v1/query_range", proxy.ProxyQueryRange.as_view()),
     path("api/v1/query", proxy.ProxyQuery.as_view(), name="proxy-query"),
     path("api/v1/series", proxy.ProxySeries.as_view()),