/
storage_retention_policy_samples.cc
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/
storage_retention_policy_samples.cc
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// Copyright 2020 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
//
// https://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/storage/client.h"
#include "google/cloud/storage/examples/storage_examples_common.h"
#include "google/cloud/internal/getenv.h"
#include <functional>
#include <iostream>
#include <thread>
namespace {
void GetRetentionPolicy(google::cloud::storage::Client client,
std::vector<std::string> const& argv) {
//! [get retention policy]
// [START storage_get_retention_policy]
namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& bucket_name) {
StatusOr<gcs::BucketMetadata> bucket_metadata =
client.GetBucketMetadata(bucket_name);
if (!bucket_metadata) throw std::move(bucket_metadata).status();
if (!bucket_metadata->has_retention_policy()) {
std::cout << "The bucket " << bucket_metadata->name()
<< " does not have a retention policy set.\n";
return;
}
std::cout << "The bucket " << bucket_metadata->name()
<< " retention policy is set to "
<< bucket_metadata->retention_policy() << "\n";
}
// [END storage_get_retention_policy]
//! [get retention policy]
(std::move(client), argv.at(0));
}
void SetRetentionPolicy(google::cloud::storage::Client client,
std::vector<std::string> const& argv) {
//! [set retention policy]
// [START storage_set_retention_policy]
namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& bucket_name,
std::chrono::seconds period) {
StatusOr<gcs::BucketMetadata> original =
client.GetBucketMetadata(bucket_name);
if (!original) throw std::move(original).status();
StatusOr<gcs::BucketMetadata> patched = client.PatchBucket(
bucket_name,
gcs::BucketMetadataPatchBuilder().SetRetentionPolicy(period),
gcs::IfMetagenerationMatch(original->metageneration()));
if (!patched) throw std::move(patched).status();
if (!patched->has_retention_policy()) {
std::cout << "The bucket " << patched->name()
<< " does not have a retention policy set.\n";
return;
}
std::cout << "The bucket " << patched->name()
<< " retention policy is set to " << patched->retention_policy()
<< "\n";
}
// [END storage_set_retention_policy]
//! [set retention policy]
(std::move(client), argv.at(0), std::chrono::seconds(std::stol(argv.at(1))));
}
void RemoveRetentionPolicy(google::cloud::storage::Client client,
std::vector<std::string> const& argv) {
//! [remove retention policy]
// [START storage_remove_retention_policy]
namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& bucket_name) {
StatusOr<gcs::BucketMetadata> original =
client.GetBucketMetadata(bucket_name);
if (!original) throw std::move(original).status();
StatusOr<gcs::BucketMetadata> patched = client.PatchBucket(
bucket_name, gcs::BucketMetadataPatchBuilder().ResetRetentionPolicy(),
gcs::IfMetagenerationMatch(original->metageneration()));
if (!patched) throw std::move(patched).status();
if (!patched->has_retention_policy()) {
std::cout << "The bucket " << patched->name()
<< " does not have a retention policy set.\n";
return;
}
std::cout << "The bucket " << patched->name()
<< " retention policy is set to " << patched->retention_policy()
<< ". This is unexpected, maybe a concurrent change by another"
<< " application?\n";
}
// [END storage_remove_retention_policy]
//! [remove retention policy]
(std::move(client), argv.at(0));
}
void LockRetentionPolicy(google::cloud::storage::Client client,
std::vector<std::string> const& argv) {
//! [lock retention policy]
// [START storage_lock_retention_policy]
namespace gcs = ::google::cloud::storage;
using ::google::cloud::StatusOr;
[](gcs::Client client, std::string const& bucket_name) {
StatusOr<gcs::BucketMetadata> original =
client.GetBucketMetadata(bucket_name);
if (!original) throw std::move(original).status();
StatusOr<gcs::BucketMetadata> updated_metadata =
client.LockBucketRetentionPolicy(bucket_name,
original->metageneration());
if (!updated_metadata) throw std::move(updated_metadata).status();
if (!updated_metadata->has_retention_policy()) {
std::cerr << "The bucket " << updated_metadata->name()
<< " does not have a retention policy, even though the"
<< " operation to set it was successful.\n"
<< "This is unexpected, and may indicate that another"
<< " application has modified the bucket concurrently.\n";
return;
}
std::cout << "Retention policy successfully locked for bucket "
<< updated_metadata->name() << "\nNew retention policy is: "
<< updated_metadata->retention_policy()
<< "\nFull metadata: " << *updated_metadata << "\n";
}
// [END storage_lock_retention_policy]
//! [lock retention policy]
(std::move(client), argv.at(0));
}
void RunAll(std::vector<std::string> const& argv) {
namespace examples = ::google::cloud::storage::examples;
namespace gcs = ::google::cloud::storage;
if (!argv.empty()) throw examples::Usage{"auto"};
examples::CheckEnvironmentVariablesAreSet({
"GOOGLE_CLOUD_PROJECT",
});
auto const project_id =
google::cloud::internal::GetEnv("GOOGLE_CLOUD_PROJECT").value();
auto generator = google::cloud::internal::DefaultPRNG(std::random_device{}());
auto const bucket_name = examples::MakeRandomBucketName(generator);
auto client = gcs::Client();
std::cout << "\nCreating bucket to run the examples" << std::endl;
(void)client.CreateBucketForProject(bucket_name, project_id,
gcs::BucketMetadata{},
examples::CreateBucketOptions());
// In GCS a single project cannot create or delete buckets more often than
// once every two seconds. We will pause until that time before deleting the
// bucket.
auto pause = std::chrono::steady_clock::now() + std::chrono::seconds(2);
std::cout << "\nRunning GetRetentionPolicy() example" << std::endl;
GetRetentionPolicy(client, {bucket_name});
std::cout << "\nRunning SetRetentionPolicy() example" << std::endl;
SetRetentionPolicy(client, {bucket_name, "30"});
std::cout << "\nRunning RemoveRetentionPolicy() example" << std::endl;
RemoveRetentionPolicy(client, {bucket_name});
std::cout << "\nRunning SetRetentionPolicy() example" << std::endl;
SetRetentionPolicy(client, {bucket_name, "30"});
std::cout << "\nRunning LockRetentionPolicy() example" << std::endl;
LockRetentionPolicy(client, {bucket_name});
std::cout << "\nCleaning up" << std::endl;
if (!examples::UsingEmulator()) std::this_thread::sleep_until(pause);
(void)examples::RemoveBucketAndContents(client, bucket_name);
}
} // anonymous namespace
int main(int argc, char* argv[]) {
namespace examples = ::google::cloud::storage::examples;
auto make_entry = [](std::string const& name,
std::vector<std::string> arg_names,
examples::ClientCommand const& cmd) {
arg_names.insert(arg_names.begin(), "<bucket-name>");
return examples::CreateCommandEntry(name, std::move(arg_names), cmd);
};
examples::Example example({
make_entry("get-retention-policy", {}, GetRetentionPolicy),
make_entry("set-retention-policy", {"<period>"}, SetRetentionPolicy),
make_entry("remove-retention-policy", {}, RemoveRetentionPolicy),
make_entry("lock-retention-policy", {}, LockRetentionPolicy),
{"auto", RunAll},
});
return example.Run(argc, argv);
}