random_database_name.cc

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// Copyright 2019 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include "google/cloud/spanner/testing/random_database_name.h"

namespace google {
namespace cloud {
namespace spanner_testing {
inline namespace SPANNER_CLIENT_NS {
std::string RandomDatabaseName(
    google::cloud::internal::DefaultPRNG& generator) {
  // A database ID must be between 2 and 30 characters, fitting the regular
  // expression `[a-z][a-z0-9_\-]*[a-z0-9]`
  int max_size = 30;
  std::string const prefix = "db-";
  auto size = static_cast<int>(max_size - 1 - prefix.size());
  return prefix +
         google::cloud::internal::Sample(
             generator, size, "abcdefghijlkmnopqrstuvwxyz012345689_-") +
         google::cloud::internal::Sample(
             generator, 1, "abcdefghijlkmnopqrstuvwxyz0123456789");
}

}  // namespace SPANNER_CLIENT_NS
}  // namespace spanner_testing
}  // namespace cloud
}  // namespace google