Pass through geofencing API calls to the browser process.

content/child/geofencing/geofencing_dispatcher.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 "content/child/geofencing/geofencing_dispatcher.h"
+
+#include "base/lazy_instance.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/message_loop/message_loop.h"
+#include "base/thread_task_runner_handle.h"
+#include "content/child/thread_safe_sender.h"
+#include "content/child/worker_thread_task_runner.h"
+#include "content/common/geofencing_messages.h"
+#include "third_party/WebKit/public/platform/WebCircularGeofencingRegion.h"
+#include "third_party/WebKit/public/platform/WebGeofencingError.h"
+#include "third_party/WebKit/public/platform/WebGeofencingRegistration.h"
+
+using blink::WebGeofencingError;
+
+namespace content {
+
+namespace {
+
+base::LazyInstance<base::ThreadLocalPointer<GeofencingDispatcher> >::Leaky
+    g_dispatcher_tls = LAZY_INSTANCE_INITIALIZER;
+
+GeofencingDispatcher* const kHasBeenDeleted =
+    reinterpret_cast<GeofencingDispatcher*>(0x1);
+
+int CurrentWorkerId() {
+  return WorkerTaskRunner::Instance()->CurrentWorkerId();
+}
+
+}  // namespace
+
+GeofencingDispatcher::GeofencingDispatcher(ThreadSafeSender* sender)
+    : thread_safe_sender_(sender) {
+  g_dispatcher_tls.Pointer()->Set(this);
+}
+
+GeofencingDispatcher::~GeofencingDispatcher() {
+  g_dispatcher_tls.Pointer()->Set(kHasBeenDeleted);
+}
+
+bool GeofencingDispatcher::Send(IPC::Message* msg) {
+  return thread_safe_sender_->Send(msg);
+}
+
+void GeofencingDispatcher::OnMessageReceived(const IPC::Message& msg) {
+  bool handled = true;
+  IPC_BEGIN_MESSAGE_MAP(GeofencingDispatcher, msg)
+    IPC_MESSAGE_HANDLER(GeofencingMsg_RegisterRegionComplete,
+                        OnRegisterRegionComplete)
+    IPC_MESSAGE_HANDLER(GeofencingMsg_UnregisterRegionComplete,
+                        OnUnregisterRegionComplete)
+    IPC_MESSAGE_HANDLER(GeofencingMsg_GetRegisteredRegionsComplete,
+                        OnGetRegisteredRegionsComplete)
+    IPC_MESSAGE_UNHANDLED(handled = false)
+  IPC_END_MESSAGE_MAP()
+  DCHECK(handled) << "Unhandled message:" << msg.type();
+}
+
+void GeofencingDispatcher::RegisterRegion(
+    const blink::WebString& region_id,
+    const blink::WebCircularGeofencingRegion& region,
+    blink::WebGeofencingCallbacks* raw_callbacks) {

[Michael van Ouwerkerk, 2014/09/15 13:06:49]

Why are these variables sometimes called "raw_callbacks" and sometimes just
"callbacks"?

[Marijn Kruisselbrink, 2014/09/17 00:04:24]

At some point I named them raw_callbacks because I then wrapped them in a
scoped_ptr callbacks to make ownership clear. But then later I changed the code
to store the callbacks directly in the IDMap's, making the scoped_ptrs a bit
pointless. Anyway, I renamed them back to be just callbacks.

+  DCHECK(raw_callbacks);
+  int request_id = region_registration_requests_.Add(raw_callbacks);
+  Send(new GeofencingHostMsg_RegisterRegion(
+      CurrentWorkerId(), request_id, region_id.utf8(), region));
+}
+
+void GeofencingDispatcher::UnregisterRegion(
+    const blink::WebString& region_id,
+    blink::WebGeofencingCallbacks* raw_callbacks) {
+  DCHECK(raw_callbacks);
+  int request_id = region_unregistration_requests_.Add(raw_callbacks);
+  Send(new GeofencingHostMsg_UnregisterRegion(
+      CurrentWorkerId(), request_id, region_id.utf8()));
+}
+
+void GeofencingDispatcher::GetRegisteredRegions(
+    blink::WebGeofencingRegionsCallbacks* raw_callbacks) {
+  DCHECK(raw_callbacks);
+  int request_id = get_registered_regions_requests_.Add(raw_callbacks);
+  Send(new GeofencingHostMsg_GetRegisteredRegions(CurrentWorkerId(),
+                                                  request_id));
+}
+
+GeofencingDispatcher* GeofencingDispatcher::GetOrCreateThreadSpecificInstance(
+    ThreadSafeSender* thread_safe_sender) {
+  if (g_dispatcher_tls.Pointer()->Get() == kHasBeenDeleted) {
+    NOTREACHED() << "Re-instantiating TLS GeofencingDispatcher.";

[Michael van Ouwerkerk, 2014/09/15 13:06:50]

Why can't this be a CHECK?

[Marijn Kruisselbrink, 2014/09/17 00:04:24]

NOTREACHED would be the equivalent of a DCHECK, not a CHECK.
I assume the reason it was written like this in ServiceWorkerDispatcher (where I
copied this code from) is because using a DCHECK would mean duplicating the
condition (once in the DCHECK and once to reset the pointer to NULL in order not
to crash). Of course technically we're not supposed to handle situations where a
DCHECK would be hit...

+    g_dispatcher_tls.Pointer()->Set(NULL);
+  }
+  if (g_dispatcher_tls.Pointer()->Get())
+    return g_dispatcher_tls.Pointer()->Get();
+
+  GeofencingDispatcher* dispatcher =
+      new GeofencingDispatcher(thread_safe_sender);
+  if (WorkerTaskRunner::Instance()->CurrentWorkerId())
+    WorkerTaskRunner::Instance()->AddStopObserver(dispatcher);
+  return dispatcher;
+}
+
+GeofencingDispatcher* GeofencingDispatcher::GetThreadSpecificInstance() {
+  if (g_dispatcher_tls.Pointer()->Get() == kHasBeenDeleted)
+    return NULL;
+  return g_dispatcher_tls.Pointer()->Get();
+}
+
+void GeofencingDispatcher::OnRegisterRegionComplete(int thread_id,
+                                                    int request_id,
+                                                    GeofencingStatus status) {
+  blink::WebGeofencingCallbacks* callbacks =
+      region_registration_requests_.Lookup(request_id);
+  DCHECK(callbacks);
+  if (!callbacks)
+    return;
+
+  if (status == GEOFENCING_STATUS_OK) {
+    callbacks->onSuccess();
+  } else {
+    callbacks->onError(new WebGeofencingError(
+        WebGeofencingError::ErrorTypeAbort,
+        blink::WebString::fromUTF8(GeofencingStatusToString(status))));
+  }
+  region_registration_requests_.Remove(request_id);
+}
+
+void GeofencingDispatcher::OnUnregisterRegionComplete(int thread_id,
+                                                      int request_id,
+                                                      GeofencingStatus status) {
+  blink::WebGeofencingCallbacks* callbacks =
+      region_unregistration_requests_.Lookup(request_id);
+  DCHECK(callbacks);
+  if (!callbacks)
+    return;
+
+  if (status == GEOFENCING_STATUS_OK) {
+    callbacks->onSuccess();
+  } else {
+    callbacks->onError(new WebGeofencingError(
+        WebGeofencingError::ErrorTypeAbort,
+        blink::WebString::fromUTF8(GeofencingStatusToString(status))));
+  }
+  region_unregistration_requests_.Remove(request_id);
+}
+
+void GeofencingDispatcher::OnGetRegisteredRegionsComplete(
+    int thread_id,
+    int request_id,
+    GeofencingStatus status,
+    const GeofencingRegistrations& regions) {
+  blink::WebGeofencingRegionsCallbacks* callbacks =
+      get_registered_regions_requests_.Lookup(request_id);
+  DCHECK(callbacks);
+  if (!callbacks)
+    return;
+
+  if (status == GEOFENCING_STATUS_OK) {
+    scoped_ptr<blink::WebVector<blink::WebGeofencingRegistration> > result(
+        new blink::WebVector<blink::WebGeofencingRegistration>(regions.size()));
+    size_t index = 0;
+    for (GeofencingRegistrations::const_iterator it = regions.begin();
+         it != regions.end(); ++it, ++index) {
+      (*result)[index].id = blink::WebString::fromUTF8(it->first);
+      (*result)[index].region = it->second;
+    }
+    callbacks->onSuccess(result.release());
+  } else {
+    callbacks->onError(new WebGeofencingError(
+        WebGeofencingError::ErrorTypeAbort,
+        blink::WebString::fromUTF8(GeofencingStatusToString(status))));
+  }
+  get_registered_regions_requests_.Remove(request_id);
+}
+
+void GeofencingDispatcher::OnWorkerRunLoopStopped() {
+  delete this;
+}
+
+}  // namespace content