Implements RTP header dumping.

chrome/browser/media/webrtc_rtp_dump_handler.cc

Index: chrome/browser/media/webrtc_rtp_dump_handler.cc
diff --git a/chrome/browser/media/webrtc_rtp_dump_handler.cc b/chrome/browser/media/webrtc_rtp_dump_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f7d77f1b9f2b2cc4e06b58b790ad098bcddc82f4
--- /dev/null
+++ b/chrome/browser/media/webrtc_rtp_dump_handler.cc
@@ -0,0 +1,339 @@
+// 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/media/webrtc_rtp_dump_handler.h"
+
+#include "base/file_util.h"
+#include "base/logging.h"
+#include "base/strings/string_number_conversions.h"
+#include "base/time/time.h"
+#include "chrome/browser/media/webrtc_rtp_dump_writer.h"
+#include "content/public/browser/browser_thread.h"
+
+using content::BrowserThread;
+
+namespace {
+
+static const size_t kMaxOngoingRtpDumpsAllowed = 5;
+
+// The browser process wide total number of ongoing (i.e. started and not
+// released) RTP dumps. Incoming and outgoing in one WebRtcDumpHandler are
+// counted as one dump.
+// Must be accessed on the browser IO thread.
+static size_t g_ongoing_rtp_dumps = 0;
+
+void FireGenericDoneCallback(
+    const WebRtcRtpDumpHandler::GenericDoneCallback& callback,
+    bool success,
+    const std::string& error_message) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DCHECK(!callback.is_null());
+
+  content::BrowserThread::PostTask(
+      content::BrowserThread::UI,
+      FROM_HERE,
+      base::Bind(callback, success, error_message));
+}
+
+bool DumpTypeContainsIncoming(RtpDumpType type) {
+  return type == RTP_DUMP_INCOMING || type == RTP_DUMP_BOTH;
+}
+
+bool DumpTypeContainsOutgoing(RtpDumpType type) {
+  return type == RTP_DUMP_OUTGOING || type == RTP_DUMP_BOTH;
+}
+
+}  // namespace
+
+WebRtcRtpDumpHandler::WebRtcRtpDumpHandler(const base::FilePath& dump_dir)
+    : dump_dir_(dump_dir),
+      incoming_state_(STATE_NONE),
+      outgoing_state_(STATE_NONE),
+      weak_ptr_factory_(this) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+}
+
+WebRtcRtpDumpHandler::~WebRtcRtpDumpHandler() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  // Reset dump writer first to stop writing.
+  if (dump_writer_) {
+    --g_ongoing_rtp_dumps;
+    dump_writer_.reset();
+  }
+
+  if (incoming_state_ != STATE_NONE && !incoming_dump_path_.empty()) {
+    BrowserThread::PostTask(
+        BrowserThread::FILE,
+        FROM_HERE,
+        base::Bind(
+            base::IgnoreResult(&base::DeleteFile), incoming_dump_path_, false));
+  }
+
+  if (outgoing_state_ != STATE_NONE && !outgoing_dump_path_.empty()) {
+    BrowserThread::PostTask(
+        BrowserThread::FILE,
+        FROM_HERE,
+        base::Bind(
+            base::IgnoreResult(&base::DeleteFile), outgoing_dump_path_, false));
+  }
+}
+
+bool WebRtcRtpDumpHandler::StartDump(RtpDumpType type,
+                                     std::string* error_message) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  if (!dump_writer_ && g_ongoing_rtp_dumps >= kMaxOngoingRtpDumpsAllowed) {
+    *error_message = "Max RTP dump limit reached.";
+    DVLOG(2) << *error_message;
+    return false;
+  }
+
+  // Returns an error if any type of dump specified by the caller cannot be
+  // started.
+  if ((DumpTypeContainsIncoming(type) && incoming_state_ != STATE_NONE) ||
+      (DumpTypeContainsOutgoing(type) && outgoing_state_ != STATE_NONE)) {
+    *error_message = "RTP dump already started.";
+    return false;
+  }
+
+  if (DumpTypeContainsIncoming(type))
+    incoming_state_ = STATE_STARTED;
+
+  if (DumpTypeContainsOutgoing(type))
+    outgoing_state_ = STATE_STARTED;
+
+  DVLOG(2) << "Start RTP dumping: type = " << type;
+
+  if (!dump_writer_) {
+    ++g_ongoing_rtp_dumps;
+
+    static const char kRecvDumpFilePrefix[] = "rtpdump_recv_";
+    static const char kSendDumpFilePrefix[] = "rtpdump_send_";
+    static const size_t kMaxDumpSize = 5 * 1024 * 1024;  // 5MB
+
+    std::string dump_id = base::DoubleToString(base::Time::Now().ToDoubleT());
+    incoming_dump_path_ =
+        dump_dir_.AppendASCII(std::string(kRecvDumpFilePrefix) + dump_id)
+            .AddExtension(FILE_PATH_LITERAL(".gz"));
+
+    outgoing_dump_path_ =
+        dump_dir_.AppendASCII(std::string(kSendDumpFilePrefix) + dump_id)
+            .AddExtension(FILE_PATH_LITERAL(".gz"));
+
+    // WebRtcRtpDumpWriter does not support changing the dump path after it's
+    // created. So we assign both incoming and outgoing dump path even if only
+    // one type of dumping has been started.
+    // For "Unretained(this)", see comments StopDump.
+    dump_writer_.reset(new WebRtcRtpDumpWriter(
+        incoming_dump_path_,
+        outgoing_dump_path_,
+        kMaxDumpSize,
+        base::Bind(&WebRtcRtpDumpHandler::OnMaxDumpSizeReached,
+                   base::Unretained(this))));
+  }
+
+  return true;
+}
+
+void WebRtcRtpDumpHandler::StopDump(RtpDumpType type,
+                                    const GenericDoneCallback& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  // Returns an error if any type of dump specified by the caller cannot be
+  // stopped.
+  if ((DumpTypeContainsIncoming(type) && incoming_state_ != STATE_STARTED) ||
+      (DumpTypeContainsOutgoing(type) && outgoing_state_ != STATE_STARTED)) {
+    if (!callback.is_null()) {
+      FireGenericDoneCallback(
+          callback, false, "RTP dump not started or already stopped.");
+    }
+    return;
+  }
+
+  DVLOG(2) << "Stopping RTP dumping: type = " << type;
+
+  if (DumpTypeContainsIncoming(type))
+    incoming_state_ = STATE_STOPPING;
+
+  if (DumpTypeContainsOutgoing(type))
+    outgoing_state_ = STATE_STOPPING;
+
+  // Using "Unretained(this)" because the this object owns the writer and the
+  // writer is guaranteed to cancel the callback before it goes away. Same for
+  // the other posted tasks bound to the writer.
+  dump_writer_->EndDump(
+      type,
+      base::Bind(&WebRtcRtpDumpHandler::OnDumpEnded,
+                 base::Unretained(this),
+                 callback.is_null()
+                     ? base::Closure()
+                     : base::Bind(&FireGenericDoneCallback, callback, true, ""),
+                 type));
+}
+
+WebRtcRtpDumpHandler::ReleasedDumps WebRtcRtpDumpHandler::ReleaseDumps() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  base::FilePath incoming_dump, outgoing_dump;
+
+  // All types of dumps must have been stopped, or one stopped and the other not
+  // started.
+  if (incoming_state_ == STATE_STARTED || incoming_state_ == STATE_STOPPING ||
+      outgoing_state_ == STATE_STARTED || outgoing_state_ == STATE_STOPPING ||
+      (incoming_state_ == STATE_NONE && outgoing_state_ == STATE_NONE)) {
+    DVLOG(2) << "ReleaseDumps called in invalid state: incoming_state = "
+             << incoming_state_ << ", outgoing_state = " << outgoing_state_;
+    return ReleasedDumps(incoming_dump, outgoing_dump);
+  }
+
+  if (incoming_state_ == STATE_STOPPED) {
+    DVLOG(2) << "Incoming RTP dumps released: " << incoming_dump_path_.value();
+
+    incoming_state_ = STATE_NONE;
+    incoming_dump = incoming_dump_path_;
+  }
+
+  if (outgoing_state_ == STATE_STOPPED) {
+    DVLOG(2) << "Outgoing RTP dumps released: " << outgoing_dump_path_.value();
+
+    outgoing_state_ = STATE_NONE;
+    outgoing_dump = outgoing_dump_path_;
+  }
+  return ReleasedDumps(incoming_dump, outgoing_dump);
+}
+
+void WebRtcRtpDumpHandler::OnRtpPacket(const uint8* packet_header,
+                                       size_t header_length,
+                                       size_t packet_length,
+                                       bool incoming) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  if ((incoming && incoming_state_ != STATE_STARTED) ||
+      (!incoming && outgoing_state_ != STATE_STARTED)) {
+    return;
+  }
+
+  dump_writer_->WriteRtpPacket(
+      packet_header, header_length, packet_length, incoming);
+}
+
+void WebRtcRtpDumpHandler::StopOngoingDumps(const base::Closure& callback) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+  DCHECK(!callback.is_null());
+
+  // No ongoing dumps, return directly.
+  if ((incoming_state_ == STATE_NONE || incoming_state_ == STATE_STOPPED) &&
+      (outgoing_state_ == STATE_NONE || outgoing_state_ == STATE_STOPPED)) {
+    callback.Run();
+    return;
+  }
+
+  // If the FILE thread is working on stopping the dumps, wait for the FILE
+  // thread to return and check the states again.
+  if (incoming_state_ == STATE_STOPPING || outgoing_state_ == STATE_STOPPING) {
+    BrowserThread::PostTaskAndReply(
+        BrowserThread::FILE,
+        FROM_HERE,
+        base::Bind(&base::DoNothing),
+        base::Bind(&WebRtcRtpDumpHandler::StopOngoingDumps,
+                   weak_ptr_factory_.GetWeakPtr(),
+                   callback));
+    return;
+  }
+
+  // Either incoming or outgoing dump must be ongoing.
+  RtpDumpType type =
+      (incoming_state_ == STATE_STARTED)
+          ? (outgoing_state_ == STATE_STARTED ? RTP_DUMP_BOTH
+                                              : RTP_DUMP_INCOMING)
+          : RTP_DUMP_OUTGOING;
+
+  if (incoming_state_ == STATE_STARTED)
+    incoming_state_ = STATE_STOPPING;
+
+  if (outgoing_state_ == STATE_STARTED)
+    outgoing_state_ = STATE_STOPPING;
+
+  DVLOG(2) << "Stopping ongoing dumps: type = " << type;
+
+  dump_writer_->EndDump(type,
+                        base::Bind(&WebRtcRtpDumpHandler::OnDumpEnded,
+                                   base::Unretained(this),
+                                   callback,
+                                   type));
+}
+
+void WebRtcRtpDumpHandler::SetDumpWriterForTesting(
+    scoped_ptr<WebRtcRtpDumpWriter> writer) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  dump_writer_ = writer.Pass();
+  ++g_ongoing_rtp_dumps;
+
+  incoming_dump_path_ = dump_dir_.AppendASCII("recv");
+  outgoing_dump_path_ = dump_dir_.AppendASCII("send");
+}
+
+void WebRtcRtpDumpHandler::OnMaxDumpSizeReached() {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  RtpDumpType type =
+      (incoming_state_ == STATE_STARTED)
+          ? (outgoing_state_ == STATE_STARTED ? RTP_DUMP_BOTH
+                                              : RTP_DUMP_INCOMING)
+          : RTP_DUMP_OUTGOING;
+  StopDump(type, GenericDoneCallback());
+}
+
+void WebRtcRtpDumpHandler::OnDumpEnded(const base::Closure& callback,
+                                       RtpDumpType ended_type,
+                                       bool incoming_success,
+                                       bool outgoing_success) {
+  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
+
+  if (DumpTypeContainsIncoming(ended_type)) {
+    DCHECK_EQ(STATE_STOPPING, incoming_state_);
+    incoming_state_ = STATE_STOPPED;
+
+    if (!incoming_success) {
+      BrowserThread::PostTask(BrowserThread::FILE,
+                              FROM_HERE,
+                              base::Bind(base::IgnoreResult(&base::DeleteFile),
+                                         incoming_dump_path_,
+                                         false));
+
+      DVLOG(2) << "Deleted invalid incoming dump "
+               << incoming_dump_path_.value();
+      incoming_dump_path_.clear();
+    }
+  }
+
+  if (DumpTypeContainsOutgoing(ended_type)) {
+    DCHECK_EQ(STATE_STOPPING, outgoing_state_);
+    outgoing_state_ = STATE_STOPPED;
+
+    if (!outgoing_success) {
+      BrowserThread::PostTask(BrowserThread::FILE,
+                              FROM_HERE,
+                              base::Bind(base::IgnoreResult(&base::DeleteFile),
+                                         outgoing_dump_path_,
+                                         false));
+
+      DVLOG(2) << "Deleted invalid outgoing dump "
+               << outgoing_dump_path_.value();
+      outgoing_dump_path_.clear();
+    }
+  }
+
+  if (!callback.is_null())
+    callback.Run();
+
+  // Release the writer when it's no longer needed.
+  if (incoming_state_ != STATE_STOPPING && outgoing_state_ != STATE_STOPPING &&
+      incoming_state_ != STATE_STARTED && outgoing_state_ != STATE_STARTED) {
+    dump_writer_.reset();
+    --g_ongoing_rtp_dumps;
+  }
+}