Aggregations: support for pipeline aggs and filter

src/module-elasticsuite-core/Search/Adapter/Elasticsuite/Request/Aggregation/Builder.php

@@ -35,17 +35,27 @@ class Builder
      */
     private $builders;
 
+    /**
+     * @var PipelineBuilderInterface[]
+     */
+    private $pipelineBuilders;
+
     /**
      * Constructor.
      *
-     * @param QueryBuilder       $queryBuilder Query builder used to build
-     *                                         Queries inside sort orders.
-     * @param BuilderInterface[] $builders     Aggregation builder implementations
+     * @param QueryBuilder               $queryBuilder     Query builder used to build
+     *                                                     Queries inside sort orders.
+     * @param BuilderInterface[]         $builders         Aggregation builder implementations
+     * @param PipelineBuilderInterface[] $pipelineBuilders Pipeline aggregation builder implementations
      */
-    public function __construct(QueryBuilder $queryBuilder, array $builders = [])
-    {
+    public function __construct(
+        QueryBuilder $queryBuilder,
+        array $builders = [],
+        array $pipelineBuilders = []
+    ) {
         $this->queryBuilder = $queryBuilder;
         $this->builders     = $builders;
+        $this->pipelineBuilders = $pipelineBuilders;
     }
 
     /**
@@ -62,8 +72,8 @@ public function buildAggregations(array $buckets = [])
         foreach ($buckets as $bucket) {
             $bucketType = $bucket->getType();
             $builder    = $this->getBuilder($bucketType);
-            $aggregation = $builder->buildBucket($bucket);
-            $subAggregations = isset($aggregation['aggregations']) ? $aggregation['aggregations'] : [];
+            $aggregation     = $builder->buildBucket($bucket);
+            $subAggregations = $aggregation['aggregations'] ?? [];
 
             if (!empty($bucket->getChildBuckets())) {
                 $subAggregations = array_merge($subAggregations, $this->buildAggregations($bucket->getChildBuckets()));
@@ -73,6 +83,13 @@ public function buildAggregations(array $buckets = [])
                 $subAggregations[$metric->getName()] = [$metric->getType() => ['field' => $metric->getField()]];
             }
 
+            foreach ($bucket->getPipelines() as $pipeline) {
+                $pipelineType    = $pipeline->getType();
+                $pipelineBuilder = $this->getPipelineBuilder($pipelineType);
+                $pipelineAgg     = $pipelineBuilder->buildPipeline($pipeline);
+                $subAggregations[$pipeline->getName()] = $pipelineAgg;
+            }
+
             if (!empty($subAggregations)) {
                 $aggregation['aggregations'] = $subAggregations;
             }
@@ -119,4 +136,20 @@ private function getBuilder($bucketType)
 
         return $this->builders[$bucketType];
     }
+
+    /**
+     * Retrieve the builder used to convert a pipeline into an ES aggregation.
+     *
+     * @param string $pipelineType Pipeline type to be built.
+     *
+     * @return PipelineBuilderInterface
+     */
+    private function getPipelineBuilder($pipelineType)
+    {
+        if (!isset($this->pipelineBuilders[$pipelineType])) {
+            throw new \InvalidArgumentException("No builder found for pipeline aggregation type {$pipelineType}.");
+        }
+
+        return $this->pipelineBuilders[$pipelineType];
+    }
 }

src/module-elasticsuite-core/Search/Adapter/Elasticsuite/Request/Aggregation/BuilderInterface.php

@@ -28,7 +28,7 @@ interface BuilderInterface
     /**
      * Build the ES aggregation from a search request bucket.
      *
-     * @param BucketInterface $bucket Bucketto be built.
+     * @param BucketInterface $bucket Bucket to be built.
      *
      * @return array
      */

src/module-elasticsuite-core/Search/Adapter/Elasticsuite/Request/Aggregation/PipelineBuilder/BucketSelector.php

@@ -0,0 +1,50 @@
+<?php
+/**
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade this module to newer
+ * versions in the future.
+ *
+ *
+ * @category  Smile
+ * @package   Smile\ElasticsuiteCore
+ * @author    Richard BAYET <richard.bayet@smile.fr>
+ * @copyright 2019 Smile
+ * @license   Open Software License ("OSL") v. 3.0
+ */
+
+namespace Smile\ElasticsuiteCore\Search\Adapter\Elasticsuite\Request\Aggregation\PipelineBuilder;
+
+use Smile\ElasticsuiteCore\Search\Adapter\Elasticsuite\Request\Aggregation\PipelineBuilderInterface;
+use Smile\ElasticsuiteCore\Search\Request\PipelineInterface;
+
+/**
+ * Build a bucket selector ES pipeline aggregation.
+ *
+ * @category Smile
+ * @package  Smile\ElasticsuiteCore
+ */
+class BucketSelector implements PipelineBuilderInterface
+{
+    /**
+     * Build the pipeline aggregation.
+     *
+     * @param PipelineInterface $pipeline Bucket selector pipeline.
+     *
+     * @return array
+     */
+    public function buildPipeline(PipelineInterface $pipeline)
+    {
+        if ($pipeline->getType() !== PipelineInterface::TYPE_BUCKET_SELECTOR) {
+            throw new \InvalidArgumentException("Query builder : invalid aggregation type {$pipeline->getType()}.");
+        }
+
+        $aggParams = [
+            'buckets_path'  => $pipeline->getBucketsPath(),
+            'script'        => $pipeline->getScript(),
+            'gap_policy'    => $pipeline->getGapPolicy(),
+        ];
+
+        return ['bucket_selector' => $aggParams];
+    }
+}

src/module-elasticsuite-core/Search/Adapter/Elasticsuite/Request/Aggregation/PipelineBuilderInterface.php

@@ -0,0 +1,36 @@
+<?php
+/**
+ * DISCLAIMER
+ *
+ * Do not edit or add to this file if you wish to upgrade this module to newer
+ * versions in the future.
+ *
+ *
+ * @category  Smile
+ * @package   Smile\ElasticsuiteCore
+ * @author    Richard BAYET <richard.bayet@smile.fr>
+ * @copyright 2019 Smile
+ * @license   Open Software License ("OSL") v. 3.0
+ */
+
+namespace Smile\ElasticsuiteCore\Search\Adapter\Elasticsuite\Request\Aggregation;
+
+use Smile\ElasticsuiteCore\Search\Request\PipelineInterface;
+
+/**
+ * Build Elasticsearch pipeline aggregation from search request PipelineInterface.
+ *
+ * @category Smile
+ * @package  Smile\ElasticsuiteCore
+ */
+interface PipelineBuilderInterface
+{
+    /**
+     * Build the ES aggregation from a search request pipeline.
+     *
+     * @param PipelineInterface $pipeline Pipeline to be built.
+     *
+     * @return array
+     */
+    public function buildPipeline(PipelineInterface $pipeline);
+}

src/module-elasticsuite-core/Search/Request/Aggregation/AggregationBuilder.php

@@ -44,20 +44,28 @@ class AggregationBuilder
      */
     private $metricFactory;
 
+    /**
+     * @var PipelineFactory
+     */
+    private $pipelineFactory;
+
     /**
      * Constructor.
      *
      * @param AggregationFactory $aggregationFactory Factory used to instantiate buckets.
      * @param MetricFactory      $metricFactory      Factory used to instantiate metrics.
+     * @param PipelineFactory    $pipelineFactory    Factory used to instantiate pipelines.
      * @param QueryBuilder       $queryBuilder       Factory used to create queries inside filtered or nested aggs.
      */
     public function __construct(
         AggregationFactory $aggregationFactory,
         MetricFactory $metricFactory,
+        PipelineFactory $pipelineFactory,
         QueryBuilder $queryBuilder
     ) {
         $this->aggregationFactory = $aggregationFactory;
         $this->metricFactory      = $metricFactory;
+        $this->pipelineFactory    = $pipelineFactory;
         $this->queryBuilder       = $queryBuilder;
     }
 
@@ -93,7 +101,7 @@ public function buildAggregations(ContainerConfigurationInterface $containerConf
     private function buildAggregation(ContainerConfigurationInterface $containerConfig, $filters, $bucketParams)
     {
         $bucketType = $bucketParams['type'];
-        $fieldName  = isset($bucketParams['field']) ? $bucketParams['field'] : $bucketParams['name'];
+        $fieldName  = $bucketParams['field'] ?? $bucketParams['name'];
 
         try {
             $field = $containerConfig->getMapping()->getField($fieldName);
@@ -107,6 +115,11 @@ private function buildAggregation(ContainerConfigurationInterface $containerConf
             $bucketParams['field'] = $fieldName;
         }
 
+        // Merge container/aggregation defined aggregation filters with global request filters.
+        $filters = array_merge($filters, $bucketParams['filters'] ?? []);
+        unset($bucketParams['filters']);
+
+        // Ensure any globally applied (attribute layered navigation) filter is NOT applied on the (most likely) originating agg.
         $bucketFilters = array_diff_key($filters, [$fieldName => true]);
         if (!empty($bucketFilters)) {
             $bucketParams['filter'] = $this->createFilter($containerConfig, $bucketFilters);
@@ -125,6 +138,8 @@ private function buildAggregation(ContainerConfigurationInterface $containerConf
             $bucketParams['nestedFilter'] = $nestedFilter;
         }
 
+        $bucketParams = $this->createPipelines($bucketParams);
+
         return $this->aggregationFactory->create($bucketType, $bucketParams);
     }
 
@@ -141,4 +156,23 @@ private function createFilter(ContainerConfigurationInterface $containerConfig,
     {
         return $this->queryBuilder->create($containerConfig, $filters, $currentPath);
     }
+
+    /**
+     * Parse bucket params and create PipelineInterface instances
+     *
+     * @param array $bucketParams Bucket params.
+     *
+     * @return array
+     */
+    private function createPipelines($bucketParams)
+    {
+        if (isset($bucketParams['pipelines'])) {
+            foreach ($bucketParams['pipelines'] as &$pipelineParams) {
+                $pipelineType = $pipelineParams['type'];
+                $pipelineParams = $this->pipelineFactory->create($pipelineType, $pipelineParams);
+            }
+        }
+
+        return $bucketParams;
+    }
 }

src/module-elasticsuite-core/Search/Request/Aggregation/Bucket/AbstractBucket.php

@@ -17,6 +17,7 @@
 use Smile\ElasticsuiteCore\Search\Request\BucketInterface;
 use Smile\ElasticsuiteCore\Search\Request\QueryInterface;
 use Smile\ElasticsuiteCore\Search\Request\MetricInterface;
+use Smile\ElasticsuiteCore\Search\Request\PipelineInterface;
 
 /**
  * Abstract bucket implementation.
@@ -46,6 +47,11 @@ abstract class AbstractBucket implements BucketInterface
      */
     private $childBuckets;
 
+    /**
+     * @var PipelineInterface[]
+     */
+    private $pipelines;
+
     /**
      * @var string
      */
@@ -64,19 +70,21 @@ abstract class AbstractBucket implements BucketInterface
     /**
      * Constructor.
      *
-     * @param string            $name         Bucket name.
-     * @param string            $field        Bucket field.
-     * @param MetricInterface[] $metrics      Bucket metrics.
-     * @param BucketInterface[] $childBuckets Child buckets.
-     * @param string            $nestedPath   Nested path for nested bucket.
-     * @param QueryInterface    $filter       Bucket filter.
-     * @param QueryInterface    $nestedFilter Nested filter for the bucket.
+     * @param string              $name         Bucket name.
+     * @param string              $field        Bucket field.
+     * @param MetricInterface[]   $metrics      Bucket metrics.
+     * @param BucketInterface[]   $childBuckets Child buckets.
+     * @param PipelineInterface[] $pipelines    Bucket pipelines.
+     * @param string              $nestedPath   Nested path for nested bucket.
+     * @param QueryInterface      $filter       Bucket filter.
+     * @param QueryInterface      $nestedFilter Nested filter for the bucket.
      */
     public function __construct(
         $name,
         $field,
         array $metrics = [],
         array $childBuckets = [],
+        array $pipelines = [],
         $nestedPath = null,
         QueryInterface $filter = null,
         QueryInterface $nestedFilter = null
@@ -85,6 +93,7 @@ public function __construct(
         $this->field        = $field;
         $this->metrics      = $metrics;
         $this->childBuckets = $childBuckets;
+        $this->pipelines    = $pipelines;
         $this->nestedPath   = $nestedPath;
         $this->filter       = $filter;
         $this->nestedFilter = $nestedFilter;
@@ -154,4 +163,12 @@ public function getChildBuckets()
     {
         return $this->childBuckets;
     }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getPipelines()
+    {
+        return $this->pipelines;
+    }
 }

src/module-elasticsuite-core/Search/Request/Aggregation/Bucket/DateHistogram.php

@@ -17,6 +17,7 @@
 use Smile\ElasticsuiteCore\Search\Request\BucketInterface;
 use Smile\ElasticsuiteCore\Search\Request\QueryInterface;
 use Smile\ElasticsuiteCore\Search\Request\MetricInterface;
+use Smile\ElasticsuiteCore\Search\Request\PipelineInterface;
 
 /**
  * Date historgram bucket implementation.
@@ -30,28 +31,43 @@ class DateHistogram extends Histogram
     /**
      * Constructor.
      *
-     * @param string            $name         Bucket name.
-     * @param string            $field        Bucket field.
-     * @param MetricInterface[] $metrics      Bucket metrics.
-     * @param BucketInterface[] $childBuckets Child buckets.
-     * @param string            $nestedPath   Nested path for nested bucket.
-     * @param QueryInterface    $filter       Bucket filter.
-     * @param QueryInterface    $nestedFilter Nested filter for the bucket.
-     * @param integer           $interval     Histogram interval.
-     * @param integer           $minDocCount  Histogram min doc count.
+     * @SuppressWarnings(PHPMD.ExcessiveParameterList)
+     *
+     * @param string              $name         Bucket name.
+     * @param string              $field        Bucket field.
+     * @param MetricInterface[]   $metrics      Bucket metrics.
+     * @param BucketInterface[]   $childBuckets Child buckets.
+     * @param PipelineInterface[] $pipelines    Bucket pipelines.
+     * @param string              $nestedPath   Nested path for nested bucket.
+     * @param QueryInterface      $filter       Bucket filter.
+     * @param QueryInterface      $nestedFilter Nested filter for the bucket.
+     * @param integer             $interval     Histogram interval.
+     * @param integer             $minDocCount  Histogram min doc count.
      */
     public function __construct(
         $name,
         $field,
         array $metrics = [],
         array $childBuckets = [],
+        array $pipelines = [],
         $nestedPath = null,
         QueryInterface $filter = null,
         QueryInterface $nestedFilter = null,
         $interval = "1d",
         $minDocCount = 0
     ) {
-        parent::__construct($name, $field, $metrics, $childBuckets, $nestedPath, $filter, $nestedFilter, $interval, $minDocCount);
+        parent::__construct(
+            $name,
+            $field,
+            $metrics,
+            $childBuckets,
+            $pipelines,
+            $nestedPath,
+            $filter,
+            $nestedFilter,
+            $interval,
+            $minDocCount
+        );
     }
 
     /**