Add tile load analytics

Author: Mark Jessop

js/tracker.js

@@ -616,6 +616,59 @@ var baseMaps = {
 
 var selectedLayer = "Mapnik";
 
+// Tile load analytics - 2023-01-09
+// This code allows us to get some understanding of total tile loads across all users.
+var tile_loads = {
+    "Mapnik": 0,
+    "DarkMatter": 0,
+    "WorldImagery": 0,
+    "Terrain": 0,
+    "Voyager": 0,
+    "OpenTopoMap": 0,
+}
+
+// Add handlers to eadh tileload event to simply increment a counter.
+// We don't need any more data than this.
+osm.on('tileload', function() { tile_loads["Mapnik"]++ });
+dark_matter.on('tileload', function() { tile_loads["DarkMatter"]++ });
+worldimagery.on('tileload', function() { tile_loads["WorldImagery"]++ });
+stamen_terrain.on('tileload', function() { tile_loads["Terrain"]++ });
+cartodb_voyager.on('tileload', function() { tile_loads["Voyager"]++ });
+opentopomap.on('tileload', function() { tile_loads["OpenTopoMap"]++ });
+
+
+var last_sent_tile_loads = {}
+
+setInterval(function(){
+
+    temp_tile_loads = Object.assign({},tile_loads);
+
+    // Check if the tile load count has changed.
+    // Using JSON stringify is a bit of a hack, but appropriate for this kind of job.
+    if(JSON.stringify(last_sent_tile_loads) == JSON.stringify(temp_tile_loads)){
+        // Tile loads havent changed, do nothing,
+    } else {
+        // Tile loads have changed. Update the store, and send the data.
+        last_sent_tile_loads = Object.assign({},tile_loads);
+
+        // Send!
+
+        $.ajax({
+            type: "PUT",
+            url: "https://api.v2.sondehub.org/tiles/count",
+            contentType: "application/json; charset=utf-8",
+            dataType: "json",
+            data: JSON.stringify({'client': clientID, 'tile_loads': last_sent_tile_loads}),
+        });
+    }
+
+}, 60000)
+
+
+
+
+
+
 // set map if in memory
 var maplayer = offline.get("map")
 if (maplayer !== null) {