1 // Copyright 2020 Google LLC
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 // Sandboxed version of multithread.c
16 // Multithreaded HTTP GET requests
17
18 #include <cstdlib>
19 #include <future> // NOLINT(build/c++11)
20 #include <thread> // NOLINT(build/c++11)
21
22 #include "../curl_util.h" // NOLINT(build/include)
23 #include "../sandbox.h" // NOLINT(build/include)
24 #include "curl_sapi.sapi.h" // NOLINT(build/include)
25 #include "absl/strings/str_cat.h"
26 #include "sandboxed_api/util/status_macros.h"
27
28 namespace {
29
pull_one_url(const std::string & url,curl::CurlApi & api)30 absl::Status pull_one_url(const std::string& url, curl::CurlApi& api) {
31 // Initialize the curl session
32 curl::CURL* curl_handle;
33 SAPI_ASSIGN_OR_RETURN(curl_handle, api.curl_easy_init());
34 sapi::v::RemotePtr curl(curl_handle);
35 if (!curl_handle) {
36 return absl::UnavailableError("curl_easy_init failed: Invalid curl handle");
37 }
38
39 int curl_code;
40
41 // Specify URL to get
42 sapi::v::ConstCStr sapi_url(url.c_str());
43 SAPI_ASSIGN_OR_RETURN(
44 curl_code,
45 api.curl_easy_setopt_ptr(&curl, curl::CURLOPT_URL, sapi_url.PtrBefore()));
46 if (curl_code != 0) {
47 return absl::UnavailableError(absl::StrCat(
48 "curl_easy_setopt_ptr failed: ", curl::StrError(&api, curl_code)));
49 }
50
51 // Perform the request
52 SAPI_ASSIGN_OR_RETURN(curl_code, api.curl_easy_perform(&curl));
53 if (curl_code != 0) {
54 return absl::UnavailableError(absl::StrCat(
55 "curl_easy_perform failed: ", curl::StrError(&api, curl_code)));
56 }
57
58 // Cleanup curl easy handle
59 SAPI_RETURN_IF_ERROR(api.curl_easy_cleanup(&curl));
60
61 return absl::OkStatus();
62 }
63
Example5()64 absl::Status Example5() {
65 // Initialize sandbox2 and sapi
66 curl::CurlSapiSandbox sandbox;
67 SAPI_RETURN_IF_ERROR(sandbox.Init());
68 curl::CurlApi api(&sandbox);
69
70 int curl_code;
71
72 // Initialize curl (CURL_GLOBAL_DEFAULT = 3)
73 SAPI_ASSIGN_OR_RETURN(curl_code, api.curl_global_init(3l));
74 if (curl_code != 0) {
75 return absl::UnavailableError(absl::StrCat(
76 "curl_global_init failed: ", curl::StrError(&api, curl_code)));
77 }
78
79 // Create the threads (by using futures)
80 const std::vector<std::string> urls = {
81 "http://example.com", "http://example.edu", "http://example.net",
82 "http://example.org"};
83 std::vector<std::future<absl::Status>> futures;
84 for (auto& url : urls) {
85 futures.emplace_back(
86 std::async(pull_one_url, std::ref(url), std::ref(api)));
87 }
88
89 // Join the threads and check for errors
90 for (auto& future : futures) {
91 SAPI_RETURN_IF_ERROR(future.get());
92 }
93
94 // Cleanup curl
95 SAPI_RETURN_IF_ERROR(api.curl_global_cleanup());
96
97 return absl::OkStatus();
98 }
99
100 } // namespace
101
main(int argc,char * argv[])102 int main(int argc, char* argv[]) {
103 gflags::ParseCommandLineFlags(&argc, &argv, true);
104 sapi::InitLogging(argv[0]);
105
106 if (absl::Status status = Example5(); !status.ok()) {
107 LOG(ERROR) << "Example5 failed: " << status.ToString();
108 return EXIT_FAILURE;
109 }
110
111 return EXIT_SUCCESS;
112 }
113