Use a more aggressive cache control header for node status endpoint

lib/cartodb/controllers/layergroup.js

@@ -116,7 +116,10 @@ LayergroupController.prototype.analysisNodeStatus = function(req, res) {
             if (err) {
                 self.sendError(req, res, err, 'GET NODE STATUS');
             } else {
-                self.sendResponse(req, res, nodeStatus, 200);
+                self.sendResponse(req, res, nodeStatus, 200, {
+                    'Cache-Control': 'public,max-age=5',
+                    'Last-Modified': new Date().toUTCString()
+                });
             }
         }
     );

test/acceptance/analysis/analysis-layers.js

@@ -304,4 +304,27 @@ describe('analysis-layers', function() {
             testClient.drain(done);
         });
     });
+
+    it('should response with custom cache headers for node status endpoints', function(done) {
+        var useCase = useCases[1];
+
+        // No API key here
+        var testClient = new TestClient(useCase.mapConfig, 1234);
+
+        testClient.getNodeStatus('HEAD', function(err, response, nodeStatus) {
+            assert.ok(!err, err);
+
+            assert.equal(nodeStatus.status, 'ready');
+
+            var headers = response.headers;
+
+            assert.equal(headers['cache-control'], 'public,max-age=5');
+
+            var lastModified = new Date(headers['last-modified']);
+            var tenSecondsInMs = 1e5;
+            assert.ok(Date.now() - lastModified.getTime() < tenSecondsInMs);
+
+            testClient.drain(done);
+        });
+    });
 });

test/support/test-client.js

@@ -2,6 +2,7 @@
 
 var qs = require('querystring');
 var step = require('step');
+var urlParser = require('url');
 
 var mapnik = require('windshaft').mapnik;
 
@@ -379,6 +380,94 @@ TestClient.prototype.getLayergroup = function(expectedResponse, callback) {
     );
 };
 
+TestClient.prototype.getNodeStatus = function(nodeName, callback) {
+    var self = this;
+
+    var url = '/api/v1/map';
+
+    if (this.apiKey) {
+        url += '?' + qs.stringify({api_key: this.apiKey});
+    }
+
+    var layergroupId;
+    var nodes = {};
+    step(
+        function createLayergroup() {
+            var next = this;
+            assert.response(server,
+                {
+                    url: url,
+                    method: 'POST',
+                    headers: {
+                        host: 'localhost',
+                        'Content-Type': 'application/json'
+                    },
+                    data: JSON.stringify(self.mapConfig)
+                },
+                {
+                    status: 200,
+                    headers: {
+                        'Content-Type': 'application/json; charset=utf-8'
+                    }
+                },
+                function(res, err) {
+                    if (err) {
+                        return next(err);
+                    }
+                    var parsedBody = JSON.parse(res.body);
+
+                    nodes = parsedBody.metadata.analyses.reduce(function(nodes, analysis) {
+                        return Object.keys(analysis.nodes).reduce(function(nodes, nodeName) {
+                            var node = analysis.nodes[nodeName];
+                            nodes[nodeName] = node.url.http;
+                            return nodes;
+                        }, nodes);
+                    }, nodes);
+
+                    return next(null, parsedBody.layergroupid);
+                }
+            );
+        },
+        function getNodeStatusResult(err, _layergroupId) {
+            assert.ifError(err);
+
+            var next = this;
+            layergroupId = _layergroupId;
+
+            url = urlParser.parse(nodes[nodeName]).path;
+
+            if (self.apiKey) {
+                url += '?' + qs.stringify({api_key: self.apiKey});
+            }
+
+            var request = {
+                url: url,
+                method: 'GET',
+                headers: {
+                    host: 'localhost'
+                }
+            };
+
+            var expectedResponse = {
+                status: 200,
+                headers: {
+                    'Content-Type': 'application/json; charset=utf-8'
+                }
+            };
+
+            assert.response(server, request, expectedResponse, function(res, err) {
+                assert.ifError(err);
+                next(null, res, JSON.parse(res.body));
+            });
+        },
+        function finish(err, res, image) {
+            self.keysToDelete['map_cfg|' + LayergroupToken.parse(layergroupId).token] = 0;
+            self.keysToDelete['user:localhost:mapviews:global'] = 5;
+            return callback(err, res, image);
+        }
+    );
+};
+
 TestClient.prototype.drain = function(callback) {
     helper.deleteRedisKeys(this.keysToDelete, callback);
 };