Jay Srinivasan | 6f6ea00 | 2012-12-14 11:26:28 -0800 | [diff] [blame] | 1 | // Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "update_engine/payload_state.h" |
| 6 | |
| 7 | #include <base/logging.h> |
| 8 | #include <base/stringprintf.h> |
| 9 | |
| 10 | #include "update_engine/omaha_request_action.h" |
| 11 | #include "update_engine/prefs.h" |
| 12 | |
| 13 | using std::string; |
| 14 | |
| 15 | namespace chromeos_update_engine { |
| 16 | |
| 17 | // Returns a string containing that subset of the fields from the OmahaResponse |
| 18 | // which we're interested in persisting for the purpose of detecting whether |
| 19 | // we should clear the rest of the payload state when we get a new |
| 20 | // OmahaResponse. |
| 21 | static string GetFilteredResponse(const OmahaResponse& response) { |
| 22 | string mini_response = StringPrintf("NumURLs = %d\n", |
| 23 | response.payload_urls.size()); |
| 24 | |
| 25 | for (size_t i = 0; i < response.payload_urls.size(); i++) |
| 26 | mini_response += StringPrintf("Url%d = %s\n", |
| 27 | i, response.payload_urls[i].c_str()); |
| 28 | |
| 29 | mini_response += StringPrintf("Payload Size = %llu\n" |
| 30 | "Payload Sha256 Hash = %s\n" |
| 31 | "Metadata Size = %llu\n" |
| 32 | "Metadata Signature = %s\n", |
| 33 | response.size, |
| 34 | response.hash.c_str(), |
| 35 | response.metadata_size, |
| 36 | response.metadata_signature.c_str()); |
| 37 | return mini_response; |
| 38 | } |
| 39 | |
| 40 | bool PayloadState::Initialize(PrefsInterface* prefs) { |
| 41 | CHECK(prefs); |
| 42 | prefs_ = prefs; |
| 43 | LoadResponse(); |
| 44 | LoadUrlIndex(); |
| 45 | LogPayloadState(); |
| 46 | return true; |
| 47 | } |
| 48 | |
| 49 | void PayloadState::LogPayloadState() { |
| 50 | LOG(INFO) << "Current Payload State:\n" |
| 51 | << "Current Response = \n" << response_ |
| 52 | << "Current URL Index = " << url_index_; |
| 53 | } |
| 54 | |
| 55 | void PayloadState::SetResponse(const OmahaResponse& omaha_response) { |
| 56 | CHECK(prefs_); |
| 57 | num_urls_ = omaha_response.payload_urls.size(); |
| 58 | string new_response = GetFilteredResponse(omaha_response); |
| 59 | bool has_response_changed = (response_ != new_response); |
| 60 | response_ = new_response; |
| 61 | LOG(INFO) << "Stored Response = \n" << response_; |
| 62 | prefs_->SetString(kPrefsCurrentResponse, response_); |
| 63 | |
| 64 | if (has_response_changed) { |
| 65 | LOG(INFO) << "Resetting all payload state as this is a new response"; |
| 66 | SetUrlIndex(0); |
| 67 | } |
| 68 | } |
| 69 | |
| 70 | void PayloadState::UpdateFailed(ActionExitCode error) { |
| 71 | LOG(INFO) << "Updating payload state for error code: " << error; |
| 72 | |
| 73 | if (!num_urls_) { |
| 74 | // Since we don't persist num_urls_, it's possible that we get an error in |
| 75 | // our communication to Omaha before even OmahaRequestAction code had a |
| 76 | // chance to call SetResponse (which sets num_urls_). So we should not |
| 77 | // advance the url_index_ in such cases. |
| 78 | LOG(INFO) << "Ignoring failures until we get a valid Omaha response."; |
| 79 | return; |
| 80 | } |
| 81 | |
| 82 | // chromium-os:37206: Classify the errors and advance the URL index at |
| 83 | // different rates for different errors in the next CL. Until then, advance |
| 84 | // URL index on every single error. |
| 85 | uint32_t next_url_index = GetUrlIndex() + 1; |
| 86 | if (next_url_index < num_urls_) { |
| 87 | LOG(INFO) << "Advancing the URL index for next attempt"; |
| 88 | } else { |
| 89 | LOG(INFO) << "Resetting the current URL index (" << GetUrlIndex() << ") to " |
| 90 | << "0 as we only have " << num_urls_ << " URL(s)"; |
| 91 | next_url_index = 0; |
| 92 | |
| 93 | // TODO(jaysri): This is the place where we should increment the |
| 94 | // payload_attempt_number so that we can back-off appropriately. |
| 95 | } |
| 96 | |
| 97 | SetUrlIndex(next_url_index); |
| 98 | } |
| 99 | |
| 100 | string PayloadState::LoadResponse() { |
| 101 | CHECK(prefs_); |
| 102 | string stored_value; |
| 103 | if (prefs_->Exists(kPrefsCurrentResponse) && |
| 104 | prefs_->GetString(kPrefsCurrentResponse, &stored_value)) { |
| 105 | response_ = stored_value; |
| 106 | } |
| 107 | return response_; |
| 108 | } |
| 109 | |
| 110 | uint32_t PayloadState::LoadUrlIndex() { |
| 111 | CHECK(prefs_); |
| 112 | int64_t stored_value; |
| 113 | if (prefs_->Exists(kPrefsCurrentUrlIndex) && |
| 114 | prefs_->GetInt64(kPrefsCurrentUrlIndex, &stored_value)) { |
| 115 | url_index_ = stored_value; |
| 116 | } |
| 117 | return url_index_; |
| 118 | } |
| 119 | |
| 120 | void PayloadState::SetUrlIndex(uint32_t url_index) { |
| 121 | CHECK(prefs_); |
| 122 | // TODO(jaysri): When we implement failure count, make sure to reset |
| 123 | // the failure count when url index changes. |
| 124 | url_index_ = url_index; |
| 125 | LOG(INFO) << "Current URL Index = " << url_index_; |
| 126 | prefs_->SetInt64(kPrefsCurrentUrlIndex, url_index_); |
| 127 | } |
| 128 | |
| 129 | } // namespace chromeos_update_engine |