feat: Merge pull request #1097 from pelias/reduce-reverse-maxSize

Reduce minimum result size of reverse Elasticsearch query

middleware/sizeCalculator.js

@@ -2,19 +2,23 @@ var _ = require('lodash');
 
 var SIZE_PADDING = 2;
 
-var MIN_QUERY_SIZE = 20;
+var DEFAULT_MIN_QUERY_SIZE = 20;
 
 /**
  * Utility for calculating query result size
  * incorporating padding for dedupe process
  */
-function setup() {
+function setup(min_size) {
+  if (min_size === undefined) {
+    min_size = DEFAULT_MIN_QUERY_SIZE;
+  }
+
   return function setQuerySize(req, res, next) {
     if (_.isUndefined(req.clean) || _.isUndefined(req.clean.size)) {
       return next();
     }
 
-   req.clean.querySize = calculateSize(req.clean.size);
+    req.clean.querySize = calculateSize(req.clean.size, min_size);
     next();
   };
 }
@@ -25,8 +29,8 @@ function setup() {
  * @param {number} cleanSize
  * @returns {number}
  */
-function calculateSize(cleanSize) {
-  return Math.max(MIN_QUERY_SIZE, cleanSize * SIZE_PADDING);
+function calculateSize(cleanSize, min_size) {
+  return Math.max(min_size, cleanSize * SIZE_PADDING);
 }
 
 module.exports = setup;

routes/v1.js

@@ -344,7 +344,7 @@ function addRoutes(app, peliasConfig) {
     reverse: createRouter([
       sanitizers.reverse.middleware,
       middleware.requestLanguage,
-      middleware.calcSize(),
+      middleware.calcSize(2),
       controllers.search(peliasConfig.api, esclient, queries.reverse, nonCoarseReverseShouldExecute),
       controllers.coarse_reverse(pipService, coarseReverseShouldExecute),
       postProc.distances('point.'),

test/unit/middleware/sizeCalculator.js

@@ -1,18 +1,17 @@
-
-var calcSize = require('../../../middleware/sizeCalculator.js')();
+var calcSizeMiddleware = require('../../../middleware/sizeCalculator.js');
 
 module.exports.tests = {};
 
 module.exports.tests.interface = function(test, common) {
   test('interface', function(t) {
-    t.equal(typeof calcSize, 'function', 'valid function');
+    t.equal(typeof calcSizeMiddleware, 'function', 'valid function');
     t.end();
   });
 };
 
 module.exports.tests.valid = function(test, common) {
   var req = { clean: {} };
-  function setup(val) {
+  function setupQuery(val) {
     if (isNaN(val)) {
       delete req.clean.size;
     }
@@ -23,7 +22,8 @@ module.exports.tests.valid = function(test, common) {
   }
 
   test('size=0', function (t) {
-    setup(0);
+    setupQuery(0);
+    const calcSize = calcSizeMiddleware();
     calcSize(req, {}, function () {
       t.equal(req.clean.querySize, 20);
       t.end();
@@ -31,7 +31,8 @@ module.exports.tests.valid = function(test, common) {
   });
 
   test('size=1', function (t) {
-    setup(1);
+    setupQuery(1);
+    const calcSize = calcSizeMiddleware();
     calcSize(req, {}, function () {
       t.equal(req.clean.querySize, 20);
       t.end();
@@ -39,7 +40,8 @@ module.exports.tests.valid = function(test, common) {
   });
 
   test('size=10', function (t) {
-    setup(10);
+    setupQuery(10);
+    const calcSize = calcSizeMiddleware();
     calcSize(req, {}, function () {
       t.equal(req.clean.querySize, 20);
       t.end();
@@ -47,7 +49,8 @@ module.exports.tests.valid = function(test, common) {
   });
 
   test('size=20', function (t) {
-    setup(20);
+    setupQuery(20);
+    const calcSize = calcSizeMiddleware();
     calcSize(req, {}, function () {
       t.equal(req.clean.querySize, 40);
       t.end();
@@ -55,12 +58,40 @@ module.exports.tests.valid = function(test, common) {
   });
 
   test('no size', function (t) {
-    setup();
+    setupQuery();
+    const calcSize = calcSizeMiddleware();
     calcSize(req, {}, function () {
       t.equal(req.clean.hasOwnProperty('querySize'), false);
       t.end();
     });
   });
+
+  test('no size, min query size 10', function (t) {
+    setupQuery();
+    const calcSize = calcSizeMiddleware(10);
+    calcSize(req, {}, function () {
+      t.equal(req.clean.hasOwnProperty('querySize'), false);
+      t.end();
+    });
+  });
+
+  test('size 5, min query size 10', function (t) {
+    setupQuery(5);
+    const calcSize = calcSizeMiddleware(10);
+    calcSize(req, {}, function () {
+      t.equal(req.clean.querySize, 10);
+      t.end();
+    });
+  });
+
+  test('size 3, min query size 2', function (t) {
+    setupQuery(3);
+    const calcSize = calcSizeMiddleware(2);
+    calcSize(req, {}, function () {
+      t.equal(req.clean.querySize, 6);
+      t.end();
+    });
+  });
 };
 
 module.exports.all = function (tape, common) {

test/unit/run.js

@@ -36,7 +36,6 @@ var tests = [
   require('./helper/geojsonify'),
   require('./helper/logging'),
   require('./helper/type_mapping'),
-  require('./helper/sizeCalculator'),
   require('./helper/stackTraceLine'),
   require('./middleware/access_log'),
   require('./middleware/accuracy'),
@@ -52,6 +51,7 @@ var tests = [
   require('./middleware/parseBBox'),
   require('./middleware/sendJSON'),
   require('./middleware/normalizeParentIds'),
+  require('./middleware/sizeCalculator'),
   require('./middleware/sortResponseData'),
   require('./middleware/trimByGranularity'),
   require('./middleware/trimByGranularityStructured'),