Initial implementation of stashed message ports, content side

content/browser/service_worker/stashed_port_manager.cc

+// Copyright 2015 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/browser/service_worker/stashed_port_manager.h"
+
+#include "content/browser/message_port_message_filter.h"
+#include "content/browser/message_port_service.h"
+#include "content/browser/service_worker/service_worker_context_wrapper.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace content {
+
+struct StashedPortManager::StashedPort {
+  StashedPort();
+  ~StashedPort();
+
+  int64 service_worker_registration_id;
+  GURL service_worker_origin;
+
+  int message_port_id;
+  base::string16 name;
+
+  // The |route_id| to the port in the process this port currently lives in, or
+  // MSG_ROUTING_NONE if the port isn't currently associated with any running
+  // ServiceWorkerVersion.
+  int route_id;
+  // The running ServiceWorkerVersion this port is currently associated with.
+  // Set to null if the port does not currently exist in a running worker.
+  ServiceWorkerVersion* service_worker;
+};
+
+StashedPortManager::StashedPort::StashedPort() {
+}
+
+StashedPortManager::StashedPort::~StashedPort() {
+}
+
+StashedPortManager::StashedPortManager(
+    const scoped_refptr<ServiceWorkerContextWrapper>& service_worker_context)
+    : service_worker_context_(service_worker_context) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+}
+
+StashedPortManager::~StashedPortManager() {
+}
+
+void StashedPortManager::Init() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+                          base::Bind(&StashedPortManager::InitOnIO, this));
+}
+
+void StashedPortManager::Shutdown() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+  BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
+                          base::Bind(&StashedPortManager::ShutdownOnIO, this));
+}
+
+void StashedPortManager::InitOnIO() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  // TODO(mek): Restore ports between service workers from storage.
+}
+
+void StashedPortManager::ShutdownOnIO() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  for (ServiceWorkerVersion* worker : observed_service_workers_) {
+    worker->RemoveListener(this);
+  }
+  observed_service_workers_.clear();
+  MessagePortService::GetInstance()->OnMessagePortDelegateClosing(this);
+}
+
+void StashedPortManager::AddPort(ServiceWorkerVersion* service_worker,
+                                 int message_port_id,
+                                 const base::string16& name) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(ports_.find(message_port_id) == ports_.end());
+
+  StashedPort& port = ports_[message_port_id];
+  port.service_worker_registration_id = service_worker->registration_id();
+  port.service_worker_origin = service_worker->scope().GetOrigin();
+  port.message_port_id = message_port_id;
+  port.name = name;
+
+  // If service worker is currently running, get its current route id and
+  // start observing the worker.
+  if (service_worker->running_status() == ServiceWorkerVersion::RUNNING) {
+    MessagePortService::GetInstance()->GetMessagePortInfo(
+        message_port_id, nullptr, &port.route_id);
+    port.service_worker = service_worker;
+    if (observed_service_workers_.insert(service_worker).second) {
+      // Service Worker wasn't already being observed
+      service_worker->AddListener(this);
+    }
+  } else {
+    port.route_id = MSG_ROUTING_NONE;
+    port.service_worker = nullptr;
+  }
+
+  MessagePortService::GetInstance()->UpdateMessagePort(message_port_id, this,
+                                                       message_port_id);
+
+  // If service worker is not currently running, all messages to this port
+  // should be held in the browser process.
+  if (port.route_id == MSG_ROUTING_NONE)
+    MessagePortService::GetInstance()->HoldMessages(message_port_id);
+}
+
+void StashedPortManager::SendMessage(
+    int message_port_id,
+    const MessagePortMessage& message,
+    const std::vector<TransferredMessagePort>& sent_message_ports) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(ports_.find(message_port_id) != ports_.end());
+
+  const StashedPort& port = ports_[message_port_id];
+  DCHECK(port.service_worker);
+  DCHECK_NE(port.route_id, MSG_ROUTING_NONE);
+  port.service_worker->embedded_worker()
+      ->message_port_message_filter()
+      ->SendMessage(port.route_id, message, sent_message_ports);
+}
+
+void StashedPortManager::MessageWasHeld(int message_port_id) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(ports_.find(message_port_id) != ports_.end());
+
+  // Messages are queued in the browser process when the stashed port isn't
+  // currently available in any running renderer processes. Try to transfer
+  // the port to a (potentially newly started) service worker to enable
+  // message delivery.
+  const StashedPort& port = ports_[message_port_id];
+  service_worker_context_->FindRegistrationForId(
+      port.service_worker_registration_id, port.service_worker_origin,
+      base::Bind(&StashedPortManager::TransferMessagePort, this,
+                 message_port_id));
+}
+
+void StashedPortManager::SendMessagesAreQueued(int message_port_id) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(ports_.find(message_port_id) != ports_.end());
+  // TODO(mek): Support transfering a stashed message port to a different
+  // process.
+}
+
+void StashedPortManager::OnRunningStateChanged(
+    ServiceWorkerVersion* service_worker) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  // Listener is only added to service workers whose running state is RUNNING,
+  // so running state here should only ever be able to be STOPPING or STOPPED.
+  DCHECK(service_worker->running_status() == ServiceWorkerVersion::STOPPING ||
+         service_worker->running_status() == ServiceWorkerVersion::STOPPED);
+
+  // Hold messages for all ports associated with the no longer running worker.
+  for (auto& port : ports_) {
+    if (port.second.service_worker != service_worker)
+      continue;
+    port.second.route_id = MSG_ROUTING_NONE;
+    port.second.service_worker = nullptr;
+    MessagePortService::GetInstance()->HoldMessages(port.first);
+  }
+  observed_service_workers_.erase(service_worker);
+  service_worker->RemoveListener(this);
+}
+
+void StashedPortManager::TransferMessagePort(
+    int message_port_id,
+    ServiceWorkerStatusCode service_worker_status,
+    const scoped_refptr<ServiceWorkerRegistration>&
+        service_worker_registration) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  auto it = ports_.find(message_port_id);
+  if (it == ports_.end()) {
+    // Port no longer owned by StashedPortManager, no need to do anything else.
+    return;
+  }
+  const StashedPort& port = it->second;
+
+  if (service_worker_status != SERVICE_WORKER_OK) {
+    // TODO(mek): SW no longer exists, somehow handle this.
+    return;
+  }
+
+  // TODO(mek): Figure out and spec correct logic for determining which version
+  // of a service worker a port should be associated with.
+  scoped_refptr<ServiceWorkerVersion> version =
+      service_worker_registration->active_version();
+  if (!version)
+    version = service_worker_registration->waiting_version();
+  if (!version)
+    version = service_worker_registration->installing_version();
+  if (!version) {
+    // TODO(mek): Do something when no version is found.
+    return;
+  }
+
+  std::vector<TransferredMessagePort> ports(1);
+  std::vector<base::string16> port_names(1);
+  ports[0].id = port.message_port_id;
+  port_names[0] = port.name;
+  version->SendStashedMessagePorts(
+      ports, port_names, base::Bind(&StashedPortManager::OnPortsTransferred,
+                                    this, version, ports));
+}
+
+void StashedPortManager::OnPortsTransferred(
+    const scoped_refptr<ServiceWorkerVersion>& service_worker,
+    const std::vector<TransferredMessagePort>& ports,
+    ServiceWorkerStatusCode service_worker_status,
+    const std::vector<int>& route_ids) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (service_worker_status != SERVICE_WORKER_OK) {
+    // TODO(mek): Handle failure.
+    return;
+  }
+
+  if (service_worker->running_status() != ServiceWorkerVersion::RUNNING) {
+    // TODO(mek): Figure out what to do in this case.
+    return;
+  }
+
+  // Port was transfered to a service worker, start observing the worker so
+  // messages can be held when the worker stops running.
+  if (observed_service_workers_.insert(service_worker.get()).second) {
+    // Service Worker wasn't already being observed
+    service_worker->AddListener(this);
+  }
+
+  // Update ports with the new route ids and service worker version.
+  DCHECK_EQ(ports.size(), route_ids.size());
+  for (size_t i = 0; i < ports.size(); ++i) {
+    DCHECK(ports_.find(ports[i].id) != ports_.end());
+    StashedPort& port = ports_[ports[i].id];
+    port.route_id = route_ids[i];
+    port.service_worker = service_worker.get();
+  }
+}
+
+}  // namespace content