Allow list of IPs in geoip ingest processor (#49573)

* Allow list of IPs in geoip ingest processor

This change lets you use array of IPs in addition to string in geoip processor source field.
It will set array containing geoip data for each element in source, unless first_only parameter
option is enabled, then only first found will be returned.

Closes #46193

Author: probakowski

docs/reference/ingest/processors/geoip.asciidoc

@@ -25,6 +25,7 @@ uncompressed. The `ingest-geoip` config directory is located at `$ES_CONFIG/inge
 | `database_file`        | no        | GeoLite2-City.mmdb                                                                 | The database filename in the geoip config directory. The ingest-geoip module ships with the GeoLite2-City.mmdb, GeoLite2-Country.mmdb and GeoLite2-ASN.mmdb files.
 | `properties`           | no        | [`continent_name`, `country_iso_code`, `region_iso_code`, `region_name`, `city_name`, `location`] *   | Controls what properties are added to the `target_field` based on the geoip lookup.
 | `ignore_missing`       | no        | `false`                                                                            | If `true` and `field` does not exist, the processor quietly exits without modifying the document
+| `first_only`           | no        | `true`                                                                             | If `true` only first found geoip data will be returned, even if `field` contains array
 |======
 
 *Depends on what is available in `database_file`:

modules/ingest-geoip/src/main/java/org/elasticsearch/ingest/geoip/GeoIpProcessor.java

@@ -41,6 +41,7 @@
 import java.net.InetAddress;
 import java.security.AccessController;
 import java.security.PrivilegedAction;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.EnumSet;
@@ -68,6 +69,7 @@ public final class GeoIpProcessor extends AbstractProcessor {
     private final Set<Property> properties;
     private final boolean ignoreMissing;
     private final GeoIpCache cache;
+    private final boolean firstOnly;
 
     /**
      * Construct a geo-IP processor.
@@ -79,22 +81,25 @@ public final class GeoIpProcessor extends AbstractProcessor {
      * @param properties    the properties; ideally this is lazily-loaded once on first use
      * @param ignoreMissing true if documents with a missing value for the field should be ignored
      * @param cache         a geo-IP cache
+     * @param firstOnly     true if only first result should be returned in case of array
      */
     GeoIpProcessor(
-            final String tag,
-            final String field,
-            final DatabaseReaderLazyLoader lazyLoader,
-            final String targetField,
-            final Set<Property> properties,
-            final boolean ignoreMissing,
-            final GeoIpCache cache) {
+        final String tag,
+        final String field,
+        final DatabaseReaderLazyLoader lazyLoader,
+        final String targetField,
+        final Set<Property> properties,
+        final boolean ignoreMissing,
+        final GeoIpCache cache,
+        boolean firstOnly) {
         super(tag);
         this.field = field;
         this.targetField = targetField;
         this.lazyLoader = lazyLoader;
         this.properties = properties;
         this.ignoreMissing = ignoreMissing;
         this.cache = cache;
+        this.firstOnly = firstOnly;
     }
 
     boolean isIgnoreMissing() {
@@ -103,19 +108,51 @@ boolean isIgnoreMissing() {
 
     @Override
     public IngestDocument execute(IngestDocument ingestDocument) throws IOException {
-        String ip = ingestDocument.getFieldValue(field, String.class, ignoreMissing);
+        Object ip = ingestDocument.getFieldValue(field, Object.class, ignoreMissing);
 
         if (ip == null && ignoreMissing) {
             return ingestDocument;
         } else if (ip == null) {
             throw new IllegalArgumentException("field [" + field + "] is null, cannot extract geoip information.");
         }
 
-        final InetAddress ipAddress = InetAddresses.forString(ip);
+        if (ip instanceof String) {
+            Map<String, Object> geoData = getGeoData((String) ip);
+            if (geoData.isEmpty() == false) {
+                ingestDocument.setFieldValue(targetField, geoData);
+            }
+        } else if (ip instanceof List) {
+            boolean match = false;
+            List<Map<String, Object>> geoDataList = new ArrayList<>(((List) ip).size());
+            for (Object ipAddr : (List) ip) {
+                if (ipAddr instanceof String == false) {
+                    throw new IllegalArgumentException("array in field [" + field + "] should only contain strings");
+                }
+                Map<String, Object> geoData = getGeoData((String) ipAddr);
+                if (geoData.isEmpty()) {
+                    geoDataList.add(null);
+                    continue;
+                }
+                if (firstOnly) {
+                    ingestDocument.setFieldValue(targetField, geoData);
+                    return ingestDocument;
+                }
+                match = true;
+                geoDataList.add(geoData);
+            }
+            if (match) {
+                ingestDocument.setFieldValue(targetField, geoDataList);
+            }
+        } else {
+            throw new IllegalArgumentException("field [" + field + "] should contain only string or array of strings");
+        }
+        return ingestDocument;
+    }
 
-        Map<String, Object> geoData;
+    private Map<String, Object> getGeoData(String ip) throws IOException {
         String databaseType = lazyLoader.getDatabaseType();
-
+        final InetAddress ipAddress = InetAddresses.forString(ip);
+        Map<String, Object> geoData;
         if (databaseType.endsWith(CITY_DB_SUFFIX)) {
             try {
                 geoData = retrieveCityGeoData(ipAddress);
@@ -136,12 +173,9 @@ public IngestDocument execute(IngestDocument ingestDocument) throws IOException
             }
         } else {
             throw new ElasticsearchParseException("Unsupported database type [" + lazyLoader.getDatabaseType()
-                    + "]", new IllegalStateException());
-        }
-        if (geoData.isEmpty() == false) {
-            ingestDocument.setFieldValue(targetField, geoData);
+                + "]", new IllegalStateException());
         }
-        return ingestDocument;
+        return geoData;
     }
 
     @Override
@@ -360,14 +394,15 @@ public Factory(Map<String, DatabaseReaderLazyLoader> databaseReaders, GeoIpCache
 
         @Override
         public GeoIpProcessor create(
-                final Map<String, Processor.Factory> registry,
-                final String processorTag,
-                final Map<String, Object> config) throws IOException {
+            final Map<String, Processor.Factory> registry,
+            final String processorTag,
+            final Map<String, Object> config) throws IOException {
             String ipField = readStringProperty(TYPE, processorTag, config, "field");
             String targetField = readStringProperty(TYPE, processorTag, config, "target_field", "geoip");
             String databaseFile = readStringProperty(TYPE, processorTag, config, "database_file", "GeoLite2-City.mmdb");
             List<String> propertyNames = readOptionalList(TYPE, processorTag, config, "properties");
             boolean ignoreMissing = readBooleanProperty(TYPE, processorTag, config, "ignore_missing", false);
+            boolean firstOnly = readBooleanProperty(TYPE, processorTag, config, "first_only", true);
 
             DatabaseReaderLazyLoader lazyLoader = databaseReaders.get(databaseFile);
             if (lazyLoader == null) {
@@ -397,11 +432,11 @@ public GeoIpProcessor create(
                     properties = DEFAULT_ASN_PROPERTIES;
                 } else {
                     throw newConfigurationException(TYPE, processorTag, "database_file", "Unsupported database type ["
-                            + databaseType + "]");
+                        + databaseType + "]");
                 }
             }
 
-            return new GeoIpProcessor(processorTag, ipField, lazyLoader, targetField, properties, ignoreMissing, cache);
+            return new GeoIpProcessor(processorTag, ipField, lazyLoader, targetField, properties, ignoreMissing, cache, firstOnly);
         }
     }
 
@@ -460,7 +495,7 @@ public static Property parseProperty(String databaseType, String value) {
                 return property;
             } catch (IllegalArgumentException e) {
                 throw new IllegalArgumentException("illegal property value [" + value + "]. valid values are " +
-                        Arrays.toString(validProperties.toArray()));
+                    Arrays.toString(validProperties.toArray()));
             }
         }
     }