sandboxed-api/oss-internship-2020/curl/examples/example5.cc
Christian Blichmann 51799f99ae Introduce a transitional logging utility library
Instead of calling `google::InitGoogleLogging()` directly, introduce an
indirection via a new utility library. After this change, Sandboxed API
should consistently use `sapi::InitLogging()` everywhere.

For now, `sapi::InitLogging()` simply calls its glog equivalent. However,
this enables us to migrate away from the gflags dependency and use Abseil
flags. Once a follow-up change lands, `sapi::InitLogging()` will instead
initialize the google logging library with flags defined from Aseil.

Later still, once Abseil releases logging, we can then drop the glog
dependency entirely.

PiperOrigin-RevId: 445363592
Change-Id: Ia23a7dc88b8ffe65a422ea4d5233bba7bdd1303a
2022-04-29 02:14:06 -07:00

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3.3 KiB
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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.
// Sandboxed version of multithread.c
// Multithreaded HTTP GET requests
#include <cstdlib>
#include <future> // NOLINT(build/c++11)
#include <thread> // NOLINT(build/c++11)
#include "../curl_util.h" // NOLINT(build/include)
#include "../sandbox.h" // NOLINT(build/include)
#include "curl_sapi.sapi.h" // NOLINT(build/include)
#include "absl/strings/str_cat.h"
#include "sandboxed_api/util/status_macros.h"
namespace {
absl::Status pull_one_url(const std::string& url, curl::CurlApi& api) {
// Initialize the curl session
curl::CURL* curl_handle;
SAPI_ASSIGN_OR_RETURN(curl_handle, api.curl_easy_init());
sapi::v::RemotePtr curl(curl_handle);
if (!curl_handle) {
return absl::UnavailableError("curl_easy_init failed: Invalid curl handle");
}
int curl_code;
// Specify URL to get
sapi::v::ConstCStr sapi_url(url.c_str());
SAPI_ASSIGN_OR_RETURN(
curl_code,
api.curl_easy_setopt_ptr(&curl, curl::CURLOPT_URL, sapi_url.PtrBefore()));
if (curl_code != 0) {
return absl::UnavailableError(absl::StrCat(
"curl_easy_setopt_ptr failed: ", curl::StrError(&api, curl_code)));
}
// Perform the request
SAPI_ASSIGN_OR_RETURN(curl_code, api.curl_easy_perform(&curl));
if (curl_code != 0) {
return absl::UnavailableError(absl::StrCat(
"curl_easy_perform failed: ", curl::StrError(&api, curl_code)));
}
// Cleanup curl easy handle
SAPI_RETURN_IF_ERROR(api.curl_easy_cleanup(&curl));
return absl::OkStatus();
}
absl::Status Example5() {
// Initialize sandbox2 and sapi
curl::CurlSapiSandbox sandbox;
SAPI_RETURN_IF_ERROR(sandbox.Init());
curl::CurlApi api(&sandbox);
int curl_code;
// Initialize curl (CURL_GLOBAL_DEFAULT = 3)
SAPI_ASSIGN_OR_RETURN(curl_code, api.curl_global_init(3l));
if (curl_code != 0) {
return absl::UnavailableError(absl::StrCat(
"curl_global_init failed: ", curl::StrError(&api, curl_code)));
}
// Create the threads (by using futures)
const std::vector<std::string> urls = {
"http://example.com", "http://example.edu", "http://example.net",
"http://example.org"};
std::vector<std::future<absl::Status>> futures;
for (auto& url : urls) {
futures.emplace_back(
std::async(pull_one_url, std::ref(url), std::ref(api)));
}
// Join the threads and check for errors
for (auto& future : futures) {
SAPI_RETURN_IF_ERROR(future.get());
}
// Cleanup curl
SAPI_RETURN_IF_ERROR(api.curl_global_cleanup());
return absl::OkStatus();
}
} // namespace
int main(int argc, char* argv[]) {
gflags::ParseCommandLineFlags(&argc, &argv, true);
sapi::InitLogging(argv[0]);
if (absl::Status status = Example5(); !status.ok()) {
LOG(ERROR) << "Example5 failed: " << status.ToString();
return EXIT_FAILURE;
}
return EXIT_SUCCESS;
}