DevTools: pick sw targets to attach to on the backend side.

content/browser/devtools/protocol/service_worker_handler.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/devtools/protocol/service_worker_handler.h"
 
-#include "content/public/browser/devtools_agent_host.h"
+#include "content/browser/devtools/service_worker_devtools_agent_host.h"
+#include "content/browser/devtools/service_worker_devtools_manager.h"
 
 namespace content {
 namespace devtools {
 namespace service_worker {
 
 using Response = DevToolsProtocolClient::Response;
 
-ServiceWorkerHandler::ServiceWorkerHandler() {
+ServiceWorkerHandler::ServiceWorkerHandler()
+    : enabled_(false) {
 }
 
 ServiceWorkerHandler::~ServiceWorkerHandler() {
   Disable();
 }
 
 void ServiceWorkerHandler::SetClient(
     scoped_ptr<Client> client) {
   client_.swap(client);
 }
 
+void ServiceWorkerHandler::SetURL(const GURL& url) {
+  url_ = url;
+  if (enabled_) {
+    for (auto pair : attached_hosts_) {
+      if (!MatchesInspectedPage(pair.second.get()))
+        WorkerDestroyed(pair.second.get());
+    }
+
+    ServiceWorkerDevToolsAgentHost::List agent_hosts;
+    ServiceWorkerDevToolsManager::GetInstance()->
+        AddAllAgentHosts(&agent_hosts);
+    for (auto host : agent_hosts) {
+      if (!MatchesInspectedPage(host.get()))
+        continue;
+      if (attached_hosts_.find(host->GetId()) != attached_hosts_.end())
+        continue;
+      // TODO(pfeldman): workers are created concurrently, we need
+      // to get notification earlier to go through the Created/Ready
+      // lifecycle.
+      WorkerReadyForInspection(host.get());
+    }
+  }
+}
+
 void ServiceWorkerHandler::Detached() {
   Disable();
 }
 
 Response ServiceWorkerHandler::Enable() {
-  DevToolsAgentHost::List agent_hosts;
+  if (enabled_)
+    return Response::OK();
+  enabled_ = true;
+
+  ServiceWorkerDevToolsManager::GetInstance()->AddObserver(this);
+
+  ServiceWorkerDevToolsAgentHost::List agent_hosts;
   ServiceWorkerDevToolsManager::GetInstance()->AddAllAgentHosts(&agent_hosts);
-  ServiceWorkerDevToolsManager::GetInstance()->AddObserver(this);
   for (auto host : agent_hosts)
-    WorkerCreated(host.get());
+    WorkerReadyForInspection(host.get());
   return Response::OK();
 }
 
 Response ServiceWorkerHandler::Disable() {
+  if (!enabled_)
+    return Response::OK();
+  enabled_ = false;
+
   ServiceWorkerDevToolsManager::GetInstance()->RemoveObserver(this);
   for (const auto& pair : attached_hosts_)
     pair.second->DetachClient();
   attached_hosts_.clear();
   return Response::OK();
 }
 
 Response ServiceWorkerHandler::SendMessage(
     const std::string& worker_id,
     const std::string& message) {
   auto it = attached_hosts_.find(worker_id);
   if (it == attached_hosts_.end())
     return Response::InternalError("Not connected to the worker");
-
   it->second->DispatchProtocolMessage(message);
   return Response::OK();
 }
 
-Response ServiceWorkerHandler::Attach(const std::string& worker_id) {
-  scoped_refptr<DevToolsAgentHost> host =
-      DevToolsAgentHost::GetForId(worker_id);
-  if (!host)
-    return Response::InternalError("No such worker available");
-
-  if (host->IsAttached())
-    return Response::InternalError("Another client is already attached");
-
-  attached_hosts_[worker_id] = host;
-  host->AttachClient(this);
-  return Response::OK();
-}
-
-Response ServiceWorkerHandler::Detach(const std::string& worker_id) {
-  auto it = attached_hosts_.find(worker_id);
-  if (it == attached_hosts_.end())
-    return Response::InternalError("Not connected to the worker");
-
-  attached_hosts_.erase(worker_id);
-  it->second->DetachClient();
-  return Response::OK();
-}
-
 void ServiceWorkerHandler::DispatchProtocolMessage(
     DevToolsAgentHost* host,
     const std::string& message) {
+
   auto it = attached_hosts_.find(host->GetId());
   if (it == attached_hosts_.end())
     return;  // Already disconnected.
 
   client_->DispatchMessage(
       DispatchMessageParams::Create()->
           set_worker_id(host->GetId())->
           set_message(message));
 }
 
 void ServiceWorkerHandler::AgentHostClosed(
     DevToolsAgentHost* host,
     bool replaced_with_another_client) {
-  WorkerDestroyed(host);
+  WorkerDestroyed(static_cast<ServiceWorkerDevToolsAgentHost*>(host));
 }
 
 void ServiceWorkerHandler::WorkerCreated(
-    DevToolsAgentHost* host) {
+    ServiceWorkerDevToolsAgentHost* host) {
+  if (!MatchesInspectedPage(host))
+    return;
+  host->PauseForDebugOnStart();
+}
+
+void ServiceWorkerHandler::WorkerReadyForInspection(
+    ServiceWorkerDevToolsAgentHost* host) {
+  if (host->IsAttached() || !MatchesInspectedPage(host))
+    return;
+
+  attached_hosts_[host->GetId()] = host;
+  host->AttachClient(this);
   client_->WorkerCreated(WorkerCreatedParams::Create()->
       set_worker_id(host->GetId())->
       set_url(host->GetURL().spec()));
 }
 
 void ServiceWorkerHandler::WorkerDestroyed(
-    DevToolsAgentHost* host) {
+    ServiceWorkerDevToolsAgentHost* host) {
   auto it = attached_hosts_.find(host->GetId());
   if (it == attached_hosts_.end())
     return;
+  it->second->DetachClient();
   client_->WorkerTerminated(WorkerTerminatedParams::Create()->
       set_worker_id(host->GetId()));
   attached_hosts_.erase(it);
 }
 
+bool ServiceWorkerHandler::MatchesInspectedPage(
+    ServiceWorkerDevToolsAgentHost* host) {
+  // TODO(pfeldman): match based on scope.
+  // TODO(pfeldman): match iframes.
+  return host->GetURL().host() == url_.host();
+}
+
 }  // namespace service_worker
 }  // namespace devtools
 }  // namespace content