Move most of the component updater artifacts to update_client.

components/update_client/update_checker.cc

Index: components/update_client/update_checker.cc
diff --git a/components/update_client/update_checker.cc b/components/update_client/update_checker.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9a38a5a4238a362a3939d2e5d0a34510e1d499ef
--- /dev/null
+++ b/components/update_client/update_checker.cc
@@ -0,0 +1,163 @@
+// Copyright 2014 The Chromium 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 "components/update_client/update_checker.h"
+
+#include <string>
+#include <vector>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/compiler_specific.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/stringprintf.h"
+#include "base/threading/thread_checker.h"
+#include "components/update_client/configurator.h"
+#include "components/update_client/crx_update_item.h"
+#include "components/update_client/request_sender.h"
+#include "components/update_client/utils.h"
+#include "net/url_request/url_fetcher.h"
+#include "url/gurl.h"
+
+namespace update_client {
+
+namespace {
+
+// Builds an update check request for |components|. |additional_attributes| is
+// serialized as part of the <request> element of the request to customize it
+// with data that is not platform or component specific. For each |item|, a
+// corresponding <app> element is created and inserted as a child node of
+// the <request>.
+//
+// An app element looks like this:
+//    <app appid="hnimpnehoodheedghdeeijklkeaacbdc"
+//         version="0.1.2.3" installsource="ondemand">
+//      <updatecheck />
+//      <packages>
+//        <package fp="abcd" />
+//      </packages>
+//    </app>
+std::string BuildUpdateCheckRequest(const Configurator& config,
+                                    const std::vector<CrxUpdateItem*>& items,
+                                    const std::string& additional_attributes) {
+  std::string app_elements;
+  for (size_t i = 0; i != items.size(); ++i) {
+    const CrxUpdateItem* item = items[i];
+    std::string app("<app ");
+    base::StringAppendF(&app, "appid=\"%s\" version=\"%s\"", item->id.c_str(),
+                        item->component.version.GetString().c_str());
+    if (item->on_demand)
+      base::StringAppendF(&app, " installsource=\"ondemand\"");
+    base::StringAppendF(&app, ">");
+    base::StringAppendF(&app, "<updatecheck />");
+    if (!item->component.fingerprint.empty()) {
+      base::StringAppendF(&app,
+                          "<packages>"
+                          "<package fp=\"%s\"/>"
+                          "</packages>",
+                          item->component.fingerprint.c_str());
+    }
+    base::StringAppendF(&app, "</app>");
+    app_elements.append(app);
+    VLOG(1) << "Appending to update request: " << app;
+  }
+
+  return BuildProtocolRequest(config.GetBrowserVersion().GetString(),
+                              config.GetChannel(), config.GetLang(),
+                              config.GetOSLongName(), app_elements,
+                              additional_attributes);
+}
+
+class UpdateCheckerImpl : public UpdateChecker {
+ public:
+  explicit UpdateCheckerImpl(const Configurator& config);
+  ~UpdateCheckerImpl() override;
+
+  // Overrides for UpdateChecker.
+  bool CheckForUpdates(
+      const std::vector<CrxUpdateItem*>& items_to_check,
+      const std::string& additional_attributes,
+      const UpdateCheckCallback& update_check_callback) override;
+
+ private:
+  void OnRequestSenderComplete(const net::URLFetcher* source);
+
+  const Configurator& config_;
+  UpdateCheckCallback update_check_callback_;
+  scoped_ptr<RequestSender> request_sender_;
+
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(UpdateCheckerImpl);
+};
+
+UpdateCheckerImpl::UpdateCheckerImpl(const Configurator& config)
+    : config_(config) {
+}
+
+UpdateCheckerImpl::~UpdateCheckerImpl() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
+
+bool UpdateCheckerImpl::CheckForUpdates(
+    const std::vector<CrxUpdateItem*>& items_to_check,
+    const std::string& additional_attributes,
+    const UpdateCheckCallback& update_check_callback) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  if (request_sender_.get()) {
+    NOTREACHED();
+    return false;  // Another update check is in progress.
+  }
+
+  update_check_callback_ = update_check_callback;
+
+  request_sender_.reset(new RequestSender(config_));
+  request_sender_->Send(
+      BuildUpdateCheckRequest(config_, items_to_check, additional_attributes),
+      config_.UpdateUrl(),
+      base::Bind(&UpdateCheckerImpl::OnRequestSenderComplete,
+                 base::Unretained(this)));
+  return true;
+}
+
+void UpdateCheckerImpl::OnRequestSenderComplete(const net::URLFetcher* source) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+
+  const GURL original_url(source->GetOriginalURL());
+  VLOG(1) << "Update check request went to: " << original_url.spec();
+
+  int error = 0;
+  std::string error_message;
+  UpdateResponse update_response;
+
+  if (FetchSuccess(*source)) {
+    std::string xml;
+    source->GetResponseAsString(&xml);
+    if (!update_response.Parse(xml)) {
+      error = -1;
+      error_message = update_response.errors();
+      VLOG(1) << "Update request failed: " << error_message;
+    }
+  } else {
+    error = GetFetchError(*source);
+    error_message.assign("network error");
+    VLOG(1) << "Update request failed: network error";
+  }
+
+  request_sender_.reset();
+  update_check_callback_.Run(original_url, error, error_message,
+                             update_response.results());
+}
+
+}  // namespace
+
+scoped_ptr<UpdateChecker> UpdateChecker::Create(const Configurator& config) {
+  return scoped_ptr<UpdateChecker>(new UpdateCheckerImpl(config));
+}
+
+}  // namespace update_client