Fix downsampling option in querier URL

Signed-off-by: Olivier Biesmans <olivier.biesmans@blablacar.com>

Author: Olivier Biesmans

pkg/query/api/v1.go

@@ -207,11 +207,10 @@ func (api *API) parseDownsamplingParamMillis(r *http.Request, defaultVal time.Du
 	const maxSourceResolutionParam = "max_source_resolution"
 	maxSourceResolution := 0 * time.Second
 
-	if api.enableAutodownsampling {
+	val := r.FormValue(maxSourceResolutionParam)
+	if api.enableAutodownsampling || (val == "auto") {
 		maxSourceResolution = defaultVal
-	}
-
-	if val := r.FormValue(maxSourceResolutionParam); val != "" {
+	} else if val != "" {
 		var err error
 		maxSourceResolution, err = parseDuration(val)
 		if err != nil {

pkg/ui/bindata.go

@@ -44,6 +44,9 @@ Prometheus.Graph.prototype.initialize = function() {
   if (self.options.tab === undefined) {
     self.options.tab = 1;
   }
+  if (self.options.max_source_resolution === undefined) {
+	  self.options.max_source_resolution = "0s";
+  }
 
   // Draw graph controls and container from Handlebars template.
 
@@ -93,6 +96,8 @@ Prometheus.Graph.prototype.initialize = function() {
   self.stacked = self.queryForm.find("input[name=stacked]");
   self.insertMetric = self.queryForm.find("select[name=insert_metric]");
   self.refreshInterval = self.queryForm.find("select[name=refresh]");
+  self.maxSourceResolutionInput = self.queryForm.find("select[name=max_source_resolution_input]");
+
 
   self.consoleTab = graphWrapper.find(".console");
   self.graphTab   = graphWrapper.find(".graph_container");
@@ -231,6 +236,8 @@ Prometheus.Graph.prototype.initialize = function() {
     stylePartialResponseBtn();
   });
 
+  self.maxSourceResolutionInput.val(self.options.max_source_resolution);
+
   self.queryForm.submit(function() {
     self.consoleTab.addClass("reload");
     self.graphTab.addClass("reload");
@@ -377,7 +384,6 @@ Prometheus.Graph.prototype.getOptions = function() {
     "range_input",
     "end_input",
     "step_input",
-    "downsample_input",
     "stacked",
     "moment_input"
   ];
@@ -390,6 +396,9 @@ Prometheus.Graph.prototype.getOptions = function() {
       }
     }
   });
+
+  options.max_source_resolution = self.maxSourceResolutionInput.val();
+
   options.expr = self.expr.val();
   options.tab = self.options.tab;
   return options;
@@ -521,7 +530,11 @@ Prometheus.Graph.prototype.submitQuery = function() {
   var startTime = new Date().getTime();
   var rangeSeconds = self.parseDuration(self.rangeInput.val());
   var resolution = parseInt(self.queryForm.find("input[name=step_input]").val()) || Math.max(Math.floor(rangeSeconds / 250), 1);
-  var maxSourceResolution = self.queryForm.find("select[name=max_source_resolution_input]").val();
+  var maxSourceResolution = self.maxSourceResolutionInput.val()
+  // normalize max_source_resolution parameter
+  if ( maxSourceResolution == "auto") {
+	  maxSourceResolution = ""
+  }
   var endDate = self.getEndDate() / 1000;
   var moment = self.getMoment() / 1000;
 

pkg/ui/static/js/graph.js

@@ -114,8 +114,8 @@
 
                         <div class="prometheus_input_group pull-left">
                            <select name="max_source_resolution_input" title="Downsampling option" id="max_source_resolution_input{{id}}">
-                              <option value="">Auto downsampling</option>
-                              <option selected="selected" value="0s">Only raw data</option>
+                              <option value="auto">Auto downsampling</option>
+                              <option value="0s">Only raw data</option>
                               <option value="5m">Max 5m downsampling</option>
                               <option value="1h">Max 1h downsampling</option>
                            </select>