AU: Retry up to 3 times 30 seconds apart on HTTP response code 0.

libcurl_http_fetcher.h

 // 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.
 
 #ifndef CHROMEOS_PLATFORM_UPDATE_ENGINE_LIBCURL_HTTP_FETCHER_H__
 #define CHROMEOS_PLATFORM_UPDATE_ENGINE_LIBCURL_HTTP_FETCHER_H__
 
 #include <map>
 #include <string>
 #include <curl/curl.h>
@@ skipping 15 matching lines @@
       : HttpFetcher(proxy_resolver),
         curl_multi_handle_(NULL),
         curl_handle_(NULL),
         timeout_source_(NULL),
         transfer_in_progress_(false),
         transfer_size_(0),
         bytes_downloaded_(0),
         resume_offset_(0),
         retry_count_(0),
         retry_seconds_(60),
+        no_network_retry_count_(0),
+        no_network_max_retries_(0),
         idle_seconds_(1),
         force_connection_type_(false),
         forced_expensive_connection_(false),
         force_build_type_(false),
         forced_official_build_(false),
         in_write_callback_(false),
         sent_byte_(false),
         terminate_requested_(false) {}
 
   // Cleans up all internal state. Does not notify delegate
@@ skipping 21 matching lines @@
   // From http://curl.haxx.se/libcurl/c/curl_multi_timeout.html:
   //     if libcurl returns a -1 timeout here, it just means that libcurl
   //     currently has no stored timeout value. You must not wait too long
   //     (more than a few seconds perhaps) before you call
   //     curl_multi_perform() again.
   void set_idle_seconds(int seconds) { idle_seconds_ = seconds; }
 
   // Sets the retry timeout. Useful for testing.
   void set_retry_seconds(int seconds) { retry_seconds_ = seconds; }
 
+  void set_no_network_max_retries(int retries) {
+    no_network_max_retries_ = retries;
+  }
+
   void SetConnectionAsExpensive(bool is_expensive) {
     force_connection_type_ = true;
     forced_expensive_connection_ = is_expensive;
   }
 
   void SetBuildType(bool is_official) {
     force_build_type_ = true;
     forced_official_build_ = is_official;
   }
 
@@ skipping 91 matching lines @@
   // In this class, resume refers to resuming a dropped HTTP connection,
   // not to resuming an interrupted download.
   off_t resume_offset_;
 
   // Number of resumes performed.
   int retry_count_;
 
   // Seconds to wait before retrying a resume.
   int retry_seconds_;
 
+  // Number of resumes due to no network (e.g., HTTP response code 0).
+  int no_network_retry_count_;
+  int no_network_max_retries_;
+
   // Seconds to wait before asking libcurl to "perform".
   int idle_seconds_;
 
   // If true, assume the network is expensive or not, according to
   // forced_expensive_connection_. (Useful for testing).
   bool force_connection_type_;
   bool forced_expensive_connection_;
 
   // If true, assume the build is official or not, according to
   // forced_official_build_. Useful for testing.
   bool force_build_type_;
   bool forced_official_build_;
 
   // If true, we are currently performing a write callback on the delegate.
   bool in_write_callback_;
-  
+
   // If true, we have returned at least one byte in the write callback
   // to the delegate.
   bool sent_byte_;
 
   // We can't clean everything up while we're in a write callback, so
   // if we get a terminate request, queue it until we can handle it.
   bool terminate_requested_;
 
   DISALLOW_COPY_AND_ASSIGN(LibcurlHttpFetcher);
 };
 
 }  // namespace chromeos_update_engine
 
 #endif  // CHROMEOS_PLATFORM_UPDATE_ENGINE_LIBCURL_HTTP_FETCHER_H__