CDRIVER-4321: Support a "rename" operation for collections (#1011)

CDRIVER-4321: Support a "rename" operation for collections

This adds support for the "rename" operation in the unified test format
this will rename the collection in the server.

This changeset does not include test updates, but was manually validated
locally against the updated changestreams tests, which cannot be enabled
without additional changes that are beyond the scope of this commit.

Author: vector-of-bool

src/libmongoc/tests/unified/operation.c

@@ -2761,6 +2761,50 @@ operation_assert_number_connections_checked_out (test_t *test,
    return true;
 }
 
+static bool
+operation_rename (test_t *test,
+                  operation_t *op,
+                  result_t *result,
+                  bson_error_t *error)
+{
+   // First validate the arguments
+   const char *object = op->object;
+   bson_parser_t *bp = bson_parser_new ();
+   bool ret = false;
+   char *new_name = NULL;
+   bson_parser_utf8 (bp, "to", &new_name);
+   bool parse_ok = bson_parser_parse (bp, op->arguments, error);
+   bson_parser_destroy (bp);
+   if (!parse_ok) {
+      goto done;
+   }
+
+   // Now get the entity
+   entity_t *ent = entity_map_get (test->entity_map, object, error);
+   if (!ent) {
+      goto done;
+   }
+   // We only support collections so far
+   if (0 != strcmp (ent->type, "collection")) {
+      test_set_error (
+         error,
+         "'rename' is only supported for collection objects '%s' has type '%s'",
+         object,
+         ent->type);
+      goto done;
+   }
+   // Rename the collection in the server,
+   mongoc_collection_t *coll = ent->value;
+   if (!mongoc_collection_rename (coll, coll->db, new_name, false, error)) {
+      goto done;
+   }
+   result_from_ok (result);
+   ret = true;
+done:
+   bson_free (new_name);
+   return ret;
+}
+
 typedef struct {
    const char *op;
    bool (*fn) (test_t *, operation_t *, result_t *, bson_error_t *);
@@ -2809,6 +2853,7 @@ operation_run (test_t *test, bson_t *op_bson, bson_error_t *error)
       {"replaceOne", operation_replace_one},
       {"updateOne", operation_update_one},
       {"updateMany", operation_update_many},
+      {"rename", operation_rename},
 
       /* Change stream and cursor operations */
       {"iterateUntilDocumentOrError",