Implemented Windows implementation compliant Linux http_loader

The `http_loader` class takes a `WebRequest` with information to send a web request, and sends it. This uses `libcurl`, which is present from installation on most major Linux distrobutions (e.g. Fedora, Ubuntu, PopOS...). If libcurl is not present on the target system, it will need to be installed.
2026-09-16 15:36:12 -04:00 · 2023-08-04 18:13:05 -05:00
parent ac121f376f
commit b0484fd83e
3 changed files with 688 additions and 0 deletions
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+// Copyright 2022 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.
+
+#ifndef THIRD_PARTY_NEARBY_INTERNAL_PLATFORM_IMPLEMENTATION_LINUX_HTTP_LOADER_H_
+#define THIRD_PARTY_NEARBY_INTERNAL_PLATFORM_IMPLEMENTATION_LINUX_HTTP_LOADER_H_
+
+#include <string>
+#include <curl/curl.h>
+
+#include "absl/status/status.h"
+#include "absl/status/statusor.h"
+#include "absl/strings/string_view.h"
+#include "internal/platform/implementation/http_loader.h"
+
+namespace nearby {
+namespace linux {
+
+// HttpLoader is used to get HTTP response from remote server.
+//
+// HttpLoader gets HTTP request information from caller, and calling Windows
+// WinInet APIs to get HTTP response. The platform handles HTTP/HTTPS sessions.
+class HttpLoader {
+ public:
+  explicit HttpLoader(const nearby::api::WebRequest& request);
+  ~HttpLoader();
+
+  absl::StatusOr<nearby::api::WebResponse> GetResponse();
+
+  const nearby::api::WebRequest& GetRequest();
+
+ private:
+  // Defines the buffer size. It is used to init a buffer for receiving HTTP
+  // response. The unit is byte.
+  static constexpr int kReceiveBufferSize = 8 * 1024;
+  static size_t CurlReadCallback(char *buffer, size_t size, size_t nitems, void *userdata);
+
+  absl::Status ConnectWebServer();
+  absl::Status SendRequest();
+  absl::StatusOr<nearby::api::WebResponse> ProcessResponse();
+  void DisconnectWebServer();
+
+  absl::StatusOr<int> QueryStatusCode(CURL *file_handle);
+  absl::StatusOr<std::string> QueryStatusText(CURL *request_handle);
+  absl::StatusOr<std::multimap<std::string, std::string>> QueryResponseHeaders(
+      CURL *request_handle);
+  absl::Status QueryResponseInfo(CURL *request_handle, CURLINFO info_level,
+                                 void *info);
+
+  absl::Status ParseUrl();
+
+  // Converts HTTP status code to absl Status.
+  //
+  // @param status_code HTTP status code, such 200, 404 etc.
+  // @param status_message short description of the status code.
+  // @return converted absl status.
+  absl::Status HTTPCodeToStatus(int status_code,
+                                absl::string_view status_message);
+
+  nearby::api::WebRequest request_;
+  std::string host_;
+  std::string path_;
+  std::string schema_;
+  bool is_secure_ = false;
+  int port_ = 80;
+
+  FILE *header_data_;
+  char *header_strings_;
+  size_t header_sizeloc_;
+  struct curl_slist *our_header_data_;
+  FILE *response_data_;
+  char *response_strings_;
+  size_t response_sizeloc_;
+  CURL *curl_;
+};
+
+}  // namespace linux
+}  // namespace nearby
+
+#endif  // THIRD_PARTY_NEARBY_INTERNAL_PLATFORM_IMPLEMENTATION_LINUX_HTTP_LOADER_H_