AU: Expose the server's HTTP response code in HttpFetcher.

libcurl_http_fetcher.cc

 // Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "update_engine/libcurl_http_fetcher.h"
 #include <algorithm>
 #include "base/logging.h"
 
 using std::max;
 using std::make_pair;
@@ skipping 60 matching lines @@
   CHECK_EQ(curl_multi_add_handle(curl_multi_handle_, curl_handle_), CURLM_OK);
   transfer_in_progress_ = true;
 }
 
 // Begins the transfer, which must not have already been started.
 void LibcurlHttpFetcher::BeginTransfer(const std::string& url) {
   transfer_size_ = -1;
   bytes_downloaded_ = 0;
   resume_offset_ = 0;
   retry_count_ = 0;
+  http_response_code_ = 0;
   ResumeTransfer(url);
   CurlPerformOnce();
 }
 
 void LibcurlHttpFetcher::TerminateTransfer() {
   CleanUp();
 }
 
 void LibcurlHttpFetcher::CurlPerformOnce() {
   CHECK(transfer_in_progress_);
   int running_handles = 0;
   CURLMcode retcode = CURLM_CALL_MULTI_PERFORM;
 
   // libcurl may request that we immediately call curl_multi_perform after it
   // returns, so we do. libcurl promises that curl_multi_perform will not block.
   while (CURLM_CALL_MULTI_PERFORM == retcode) {
     retcode = curl_multi_perform(curl_multi_handle_, &running_handles);
   }
   if (0 == running_handles) {
     long http_response_code = 0;
     if (curl_easy_getinfo(curl_handle_,
                           CURLINFO_RESPONSE_CODE,
                           &http_response_code) == CURLE_OK) {
       LOG(INFO) << "HTTP response code: " << http_response_code;
     } else {
       LOG(ERROR) << "Unable to get http response code.";
     }
+    http_response_code_ = static_cast<int>(http_response_code);
 
     // we're done!
     CleanUp();
 
     if ((transfer_size_ >= 0) && (bytes_downloaded_ < transfer_size_)) {
       // Need to restart transfer
       retry_count_++;
       LOG(INFO) << "Restarting transfer b/c we finished, had downloaded "
                 << bytes_downloaded_ << " bytes, but transfer_size_ is "
                 << transfer_size_ << ". retry_count: " << retry_count_;
@@ skipping 162 matching lines @@
     curl_handle_ = NULL;
   }
   if (curl_multi_handle_) {
     CHECK_EQ(curl_multi_cleanup(curl_multi_handle_), CURLM_OK);
     curl_multi_handle_ = NULL;
   }
   transfer_in_progress_ = false;
 }
 
 }  // namespace chromeos_update_engine