tools/scylla-nodetool: implement the decommission command

test/nodetool/test_nodeops.py

@@ -0,0 +1,12 @@
+#
+# Copyright 2023-present ScyllaDB
+#
+# SPDX-License-Identifier: AGPL-3.0-or-later
+#
+
+from rest_api_mock import expected_request
+
+
+def test_decommission(nodetool):
+    nodetool("decommission", expected_requests=[
+        expected_request("POST", "/storage_service/decommission")])

tools/scylla-nodetool.cc

@@ -347,6 +347,11 @@ void compactionhistory_operation(scylla_rest_client& client, const bpo::variable
     }
 }
 
+
+void decommission_operation(scylla_rest_client& client, const bpo::variables_map& vm) {
+    client.post("/storage_service/decommission");
+}
+
 void disableautocompaction_operation(scylla_rest_client& client, const bpo::variables_map& vm) {
     if (!vm.count("keyspace")) {
         for (const auto& keyspace :  get_keyspaces(client)) {
@@ -773,6 +778,16 @@ Fore more information, see: https://opensource.docs.scylladb.com/stable/operatin
             },
             compactionhistory_operation
         },
+        {
+            {
+                "decommission",
+                "Deactivate a selected node by streaming its data to the next node in the ring",
+R"(
+Fore more information, see: https://opensource.docs.scylladb.com/stable/operating-scylla/nodetool-commands/decommission.html
+)",
+            },
+            decommission_operation
+        },
         {
             {
                 "disableautocompaction",