Support wildcards for getting repositories or snapshots

Closes #15151

Author: Yannick Welsch

core/src/main/java/org/elasticsearch/action/admin/cluster/repositories/get/TransportGetRepositoriesAction.java

@@ -31,14 +31,17 @@
 import org.elasticsearch.cluster.metadata.RepositoriesMetaData;
 import org.elasticsearch.cluster.metadata.RepositoryMetaData;
 import org.elasticsearch.common.inject.Inject;
+import org.elasticsearch.common.regex.Regex;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.repositories.RepositoryMissingException;
 import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.transport.TransportService;
 
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Set;
 
 /**
  * Transport action for get repositories operation
@@ -78,8 +81,20 @@ protected void masterOperation(final GetRepositoriesRequest request, ClusterStat
             }
         } else {
             if (repositories != null) {
+                Set<String> repositoriesToGet = new LinkedHashSet<>(); // to keep insertion order
+                for (String repositoryOrPattern : request.repositories()) {
+                    if (Regex.isSimpleMatchPattern(repositoryOrPattern) == false) {
+                        repositoriesToGet.add(repositoryOrPattern);
+                    } else {
+                        for (RepositoryMetaData repository : repositories.repositories()) {
+                            if (Regex.simpleMatch(repositoryOrPattern, repository.name())) {
+                                repositoriesToGet.add(repository.name());
+                            }
+                        }
+                    }
+                }
                 List<RepositoryMetaData> repositoryListBuilder = new ArrayList<>();
-                for (String repository : request.repositories()) {
+                for (String repository : repositoriesToGet) {
                     RepositoryMetaData repositoryMetaData = repositories.repository(repository);
                     if (repositoryMetaData == null) {
                         listener.onFailure(new RepositoryMissingException(repository));

core/src/main/java/org/elasticsearch/action/admin/cluster/snapshots/get/TransportGetSnapshotsAction.java

@@ -29,6 +29,7 @@
 import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
 import org.elasticsearch.cluster.metadata.SnapshotId;
 import org.elasticsearch.common.inject.Inject;
+import org.elasticsearch.common.regex.Regex;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.snapshots.Snapshot;
 import org.elasticsearch.snapshots.SnapshotInfo;
@@ -38,7 +39,9 @@
 
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.LinkedHashSet;
 import java.util.List;
+import java.util.Set;
 
 /**
  * Transport Action for get snapshots operation
@@ -84,8 +87,24 @@ protected void masterOperation(final GetSnapshotsRequest request, ClusterState s
                     snapshotInfoBuilder.add(new SnapshotInfo(snapshot));
                 }
             } else {
-                for (int i = 0; i < request.snapshots().length; i++) {
-                    SnapshotId snapshotId = new SnapshotId(request.repository(), request.snapshots()[i]);
+                Set<String> snapshotsToGet = new LinkedHashSet<>(); // to keep insertion order
+                List<Snapshot> snapshots = null;
+                for (String snapshotOrPattern : request.snapshots()) {
+                    if (Regex.isSimpleMatchPattern(snapshotOrPattern) == false) {
+                        snapshotsToGet.add(snapshotOrPattern);
+                    } else {
+                        if (snapshots == null) { // lazily load snapshots
+                            snapshots = snapshotsService.snapshots(request.repository(), request.ignoreUnavailable());
+                        }
+                        for (Snapshot snapshot : snapshots) {
+                            if (Regex.simpleMatch(snapshotOrPattern, snapshot.name())) {
+                                snapshotsToGet.add(snapshot.name());
+                            }
+                        }
+                    }
+                }
+                for (String snapshot : snapshotsToGet) {
+                    SnapshotId snapshotId = new SnapshotId(request.repository(), snapshot);
                     snapshotInfoBuilder.add(new SnapshotInfo(snapshotsService.snapshot(snapshotId)));
                 }
             }

core/src/test/java/org/elasticsearch/snapshots/RepositoriesIT.java

@@ -94,7 +94,8 @@ public void testRepositoryCreation() throws Exception {
         assertThat(repositoriesMetaData.repository("test-repo-2").type(), equalTo("fs"));
 
         logger.info("--> check that both repositories can be retrieved by getRepositories query");
-        GetRepositoriesResponse repositoriesResponse = client.admin().cluster().prepareGetRepositories().get();
+        GetRepositoriesResponse repositoriesResponse = client.admin().cluster()
+            .prepareGetRepositories(randomFrom("_all", "*", "test-repo-*")).get();
         assertThat(repositoriesResponse.repositories().size(), equalTo(2));
         assertThat(findRepository(repositoriesResponse.repositories(), "test-repo-1"), notNullValue());
         assertThat(findRepository(repositoriesResponse.repositories(), "test-repo-2"), notNullValue());

core/src/test/java/org/elasticsearch/snapshots/SharedClusterSnapshotRestoreIT.java

@@ -149,7 +149,10 @@ public void testBasicWorkFlow() throws Exception {
         assertThat(createSnapshotResponse.getSnapshotInfo().successfulShards(), greaterThan(0));
         assertThat(createSnapshotResponse.getSnapshotInfo().successfulShards(), equalTo(createSnapshotResponse.getSnapshotInfo().totalShards()));
 
-        SnapshotInfo snapshotInfo = client.admin().cluster().prepareGetSnapshots("test-repo").setSnapshots("test-snap").get().getSnapshots().get(0);
+        List<SnapshotInfo> snapshotInfos = client.admin().cluster().prepareGetSnapshots("test-repo")
+            .setSnapshots(randomFrom("test-snap", "_all", "*", "*-snap", "test*")).get().getSnapshots();
+        assertThat(snapshotInfos.size(), equalTo(1));
+        SnapshotInfo snapshotInfo = snapshotInfos.get(0);
         assertThat(snapshotInfo.state(), equalTo(SnapshotState.SUCCESS));
         assertThat(snapshotInfo.version(), equalTo(Version.CURRENT));
 

docs/reference/modules/snapshots.asciidoc

@@ -45,6 +45,15 @@ which returns:
 }
 -----------------------------------
 
+Information about multiple repositories can be fetched in one go by using a comma-delimited list of repository names.
+Star wildcards are supported as well. For example, information about repositories that start with `repo` or that contain `backup`
+can be obtained using the following command:
+
+[source,js]
+-----------------------------------
+GET /_snapshot/repo*,*backup*
+-----------------------------------
+
 If a repository name is not specified, or `_all` is used as repository name Elasticsearch will return information about
 all repositories currently registered in the cluster:
 
@@ -251,6 +260,14 @@ GET /_snapshot/my_backup/snapshot_1
 -----------------------------------
 // AUTOSENSE
 
+Similar as for repositories, information about multiple snapshots can be queried in one go, supporting wildcards as well:
+
+[source,sh]
+-----------------------------------
+GET /_snapshot/my_backup/snapshot_*,some_other_snapshot
+-----------------------------------
+// AUTOSENSE
+
 All snapshots currently stored in the repository can be listed using the following command:
 
 [source,sh]