WIP: The tracing service prototype

content/browser/tracing/trace_message_filter.cc

 // Copyright (c) 2012 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/tracing/trace_message_filter.h"
 
 #include "components/tracing/common/tracing_messages.h"
 #include "content/browser/tracing/background_tracing_manager_impl.h"
 #include "content/browser/tracing/tracing_controller_impl.h"
 #include "content/common/child_process_host_impl.h"
 
 namespace content {
 
 TraceMessageFilter::TraceMessageFilter(int child_process_id)
-    : BrowserMessageFilter(TracingMsgStart),
-      has_child_(false),
-      tracing_process_id_(
-          ChildProcessHostImpl::ChildProcessUniqueIdToTracingProcessId(
-              child_process_id)),
-      is_awaiting_end_ack_(false),
-      is_awaiting_buffer_percent_full_ack_(false) {
-}
+    : BrowserMessageFilter(TracingMsgStart) {}
 
 TraceMessageFilter::~TraceMessageFilter() {}
 
-void TraceMessageFilter::OnChannelClosing() {
-  if (has_child_) {
-    if (is_awaiting_end_ack_)
-      OnEndTracingAck(std::vector<std::string>());
-
-    if (is_awaiting_buffer_percent_full_ack_)
-      OnTraceLogStatusReply(base::trace_event::TraceLogStatus());
-
-    TracingControllerImpl::GetInstance()->RemoveTraceMessageFilter(this);
-  }
-}
-
 bool TraceMessageFilter::OnMessageReceived(const IPC::Message& message) {
   // Always on IO thread (BrowserMessageFilter guarantee).
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(TraceMessageFilter, message)
-    IPC_MESSAGE_HANDLER(TracingHostMsg_ChildSupportsTracing,
-                        OnChildSupportsTracing)
-    IPC_MESSAGE_HANDLER(TracingHostMsg_EndTracingAck, OnEndTracingAck)
-    IPC_MESSAGE_HANDLER(TracingHostMsg_TraceDataCollected,
-                        OnTraceDataCollected)
-    IPC_MESSAGE_HANDLER(TracingHostMsg_TraceLogStatusReply,
-                        OnTraceLogStatusReply)
     IPC_MESSAGE_HANDLER(TracingHostMsg_TriggerBackgroundTrace,
                         OnTriggerBackgroundTrace)
     IPC_MESSAGE_HANDLER(TracingHostMsg_AbortBackgroundTrace,
                         OnAbortBackgroundTrace)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
-void TraceMessageFilter::SendBeginTracing(
-      const base::trace_event::TraceConfig& trace_config) {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  Send(new TracingMsg_BeginTracing(
-      trace_config.ToString(), base::TimeTicks::Now(), tracing_process_id_));
-}
-
-void TraceMessageFilter::SendEndTracing() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  DCHECK(!is_awaiting_end_ack_);
-  is_awaiting_end_ack_ = true;
-  Send(new TracingMsg_EndTracing);
-}
-
-void TraceMessageFilter::SendCancelTracing() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  DCHECK(!is_awaiting_end_ack_);
-  is_awaiting_end_ack_ = true;
-  Send(new TracingMsg_CancelTracing);
-}
-
-void TraceMessageFilter::SendGetTraceLogStatus() {
-  DCHECK_CURRENTLY_ON(BrowserThread::UI);
-  DCHECK(!is_awaiting_buffer_percent_full_ack_);
-  is_awaiting_buffer_percent_full_ack_ = true;
-  Send(new TracingMsg_GetTraceLogStatus);
-}
-
-void TraceMessageFilter::OnChildSupportsTracing() {
-  has_child_ = true;
-  TracingControllerImpl::GetInstance()->AddTraceMessageFilter(this);
-}
-
-void TraceMessageFilter::OnEndTracingAck(
-    const std::vector<std::string>& known_categories) {
-  // is_awaiting_end_ack_ should always be true here, but check in case the
-  // child process is compromised.
-  if (is_awaiting_end_ack_) {
-    is_awaiting_end_ack_ = false;
-    TracingControllerImpl::GetInstance()->OnStopTracingAcked(
-        this, known_categories);
-  } else {
-    NOTREACHED();
-  }
-}
-
-void TraceMessageFilter::OnTraceDataCollected(const std::string& data) {
-  scoped_refptr<base::RefCountedString> data_ptr(new base::RefCountedString());
-  data_ptr->data() = data;
-  TracingControllerImpl::GetInstance()->OnTraceDataCollected(data_ptr);
-}
-
-void TraceMessageFilter::OnTraceLogStatusReply(
-    const base::trace_event::TraceLogStatus& status) {
-  if (is_awaiting_buffer_percent_full_ack_) {
-    is_awaiting_buffer_percent_full_ack_ = false;
-    TracingControllerImpl::GetInstance()->OnTraceLogStatusReply(this, status);
-  } else {
-    NOTREACHED();
-  }
-}
-
 void TraceMessageFilter::OnTriggerBackgroundTrace(const std::string& name) {
   BackgroundTracingManagerImpl::GetInstance()->OnHistogramTrigger(name);
 }
 
 void TraceMessageFilter::OnAbortBackgroundTrace() {
   BackgroundTracingManagerImpl::GetInstance()->AbortScenario();
 }
 
 }  // namespace content