Add the Copresence API.

chrome/browser/extensions/api/copresence/copresence_api.cc

+// 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 "chrome/browser/extensions/api/copresence/copresence_api.h"
+
+#include "base/lazy_instance.h"
+#include "base/memory/linked_ptr.h"
+#include "chrome/browser/copresence/chrome_whispernet_client.h"
+#include "chrome/browser/extensions/api/copresence/copresence_util.h"
+#include "chrome/common/chrome_version_info.h"
+#include "chrome/common/extensions/api/copresence.h"
+#include "components/copresence/proto/data.pb.h"
+#include "components/copresence/proto/enums.pb.h"
+#include "components/copresence/proto/rpcs.pb.h"
+#include "components/copresence/public/copresence_client.h"
+#include "components/copresence/public/whispernet_client.h"
+#include "content/public/browser/browser_context.h"
+#include "extensions/browser/event_router.h"
+
+namespace extensions {
+
+namespace {
+
+base::LazyInstance<BrowserContextKeyedAPIFactory<CopresenceService> >
+    g_factory = LAZY_INSTANCE_INITIALIZER;
+
+const char kInvalidOperationsMessage[] =
+    "Invalid operation in operations array.";
+
+}  // namespace
+
+// CopresenceService implementation:
+
+CopresenceService::CopresenceService(content::BrowserContext* context)
+    : browser_context_(context) {
+}
+
+CopresenceService::~CopresenceService() {
+}
+
+copresence::CopresenceClient* CopresenceService::client() {
+  if (!client_)
+    client_.reset(new copresence::CopresenceClient(this));
+  return client_.get();
+}
+
+copresence::WhispernetClient* CopresenceService::whispernet_client() {
+  if (!whispernet_client_)
+    whispernet_client_.reset(new ChromeWhispernetClient(browser_context_));
+  return whispernet_client_.get();
+}
+
+void CopresenceService::Shutdown() {
+  if (client_.get())
+    client_->Shutdown();
+}
+
+// static
+BrowserContextKeyedAPIFactory<CopresenceService>*
+CopresenceService::GetFactoryInstance() {
+  return g_factory.Pointer();
+}
+
+void CopresenceService::HandleMessages(
+    const std::string& /* app_id */,
+    const std::string& subscription_id,
+    const std::vector<copresence::Message>& messages) {
+  // TODO(ckehoe): Once the server starts sending back the app ids associated
+  // with subscriptions, use that instead of the apps_by_subs registry.
+  std::string app_id = GetCopresenceService(browser_context_)

[not at google - send to devlin, 2014/08/07 20:41:18]

I don't understand this call. Why is a CopresenceService calling
GetCopresenceService? isn't it |this|?

[rkc, 2014/08/07 21:43:02]

Whoops, that's kinda silly :) Fixed.
Done.

+                           ->apps_by_subscription_id()[subscription_id];
+
+  if (app_id.empty()) {
+    LOG(ERROR) << "Skipping message from unrecognized subscription "
+               << subscription_id;
+    return;
+  }
+
+  int message_count = messages.size();
+  std::vector<linked_ptr<api::copresence::Message> > api_messages(
+      message_count);
+
+  for (int m = 0; m < message_count; ++m) {
+    api_messages[m].reset(new api::copresence::Message);
+    api_messages[m]->type = messages[m].type().type();
+    api_messages[m]->payload = messages[m].payload();
+    DVLOG(2) << "Dispatching message of type " << api_messages[m]->type << ":\n"
+             << api_messages[m]->payload;
+  }
+
+  // Send the messages to the client app.
+  scoped_ptr<Event> event(
+      new Event(api::copresence::OnMessagesReceived::kEventName,
+                api::copresence::OnMessagesReceived::Create(subscription_id,
+                                                            api_messages)));
+  event->restrict_to_browser_context = browser_context_;

[not at google - send to devlin, 2014/08/07 20:41:18]

you can construct this directly:
https://code.google.com/p/chromium/codesearch#chromium/src/extensions/browser...

[rkc, 2014/08/07 21:43:02]

Done.

+  EventRouter::Get(browser_context_)
+      ->DispatchEventToExtension(app_id, event.Pass());
+  DVLOG(2) << "Passed " << api_messages.size() << " messages to app \""
+           << app_id << "\" for subscription \"" << subscription_id << "\"";
+}
+
+net::URLRequestContextGetter* CopresenceService::GetRequestContext() const {
+  return browser_context_->GetRequestContext();
+}
+
+const std::string CopresenceService::GetPlatformVersionString() const {
+  return chrome::VersionInfo().CreateVersionString();
+}
+
+copresence::WhispernetClient* CopresenceService::GetWhispernetClient() {
+  return whispernet_client_.get();
+}
+
+template <>
+void
+BrowserContextKeyedAPIFactory<CopresenceService>::DeclareFactoryDependencies() {
+  DependsOn(ExtensionsBrowserClient::Get()->GetExtensionSystemFactory());
+}
+
+// CopresenceExecuteFunction implementation:
+ExtensionFunction::ResponseAction CopresenceExecuteFunction::Run() {
+  scoped_ptr<api::copresence::Execute::Params> params(
+      api::copresence::Execute::Params::Create(*args_));
+  EXTENSION_FUNCTION_VALIDATE(params.get());
+
+  SubscriptionToAppMap& apps_by_subscription_id =
+      GetCopresenceService(browser_context())->apps_by_subscription_id();

[not at google - send to devlin, 2014/08/07 20:41:18]

you seem to be checking for a NULL copresence service in some places but not
others.

when would there not be a copresence service?

[rkc, 2014/08/07 21:43:02]

Copresence service should always be available (or get constructed if not
available). Removed all checks for the service, but added a check to the
beginning of this method for checking if the client is NULL.

+
+  // Each execute will correspond to one ReportRequest protocol buffer.
+  copresence::ReportRequest request;
+  if (!PrepareReportRequestProto(params->operations,
+                                 extension_id(),
+                                 &apps_by_subscription_id,
+                                 &request)) {
+    return RespondNow(Error(kInvalidOperationsMessage));
+  }
+
+  GetCopresenceClient(browser_context())->ExecuteReportRequest(
+      request,
+      extension_id(),
+      base::Bind(&CopresenceExecuteFunction::SendResult, this));
+  return RespondLater();
+}
+
+void CopresenceExecuteFunction::SendResult(
+    copresence::CopresenceStatus status) {
+  api::copresence::ExecuteStatus api_status =
+      (status == copresence::SUCCESS) ? api::copresence::EXECUTE_STATUS_SUCCESS
+                                      : api::copresence::EXECUTE_STATUS_FAILED;
+  Respond(ArgumentList(api::copresence::Execute::Results::Create(api_status)));
+}
+
+// CopresenceSetApiKeyFunction implementation:
+ExtensionFunction::ResponseAction CopresenceSetApiKeyFunction::Run() {
+  scoped_ptr<api::copresence::SetApiKey::Params> params(
+      api::copresence::SetApiKey::Params::Create(*args_));
+  EXTENSION_FUNCTION_VALIDATE(params.get());
+
+  // TODO(rkc): Use the API key set by this function for this app.
+  // http://crbug.com/400617.
+  return RespondNow(NoArguments());
+}
+
+}  // namespace extensions