Add Promises for EME (Chromium side)

content/renderer/media/webcontentdecryptionmodulesession_impl.cc

 // Copyright 2013 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/renderer/media/webcontentdecryptionmodulesession_impl.h"
 
+#include "base/bind.h"
 #include "base/callback_helpers.h"
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/renderer/media/cdm_session_adapter.h"
+#include "media/base/cdm_promise.h"
 #include "third_party/WebKit/public/platform/WebURL.h"
 
 namespace content {
 
 WebContentDecryptionModuleSessionImpl::WebContentDecryptionModuleSessionImpl(
-    uint32 session_id,
     Client* client,
     const scoped_refptr<CdmSessionAdapter>& adapter)
     : adapter_(adapter),
       client_(client),
-      session_id_(session_id) {
+      weak_ptr_factory_(this) {
 }
 
 WebContentDecryptionModuleSessionImpl::
     ~WebContentDecryptionModuleSessionImpl() {
-  adapter_->RemoveSession(session_id_);
+  if (!web_session_id_.empty())
+    adapter_->RemoveSession(web_session_id_);
 }
 
 blink::WebString WebContentDecryptionModuleSessionImpl::sessionId() const {
-  return web_session_id_;
+  return blink::WebString::fromUTF8(web_session_id_);
 }
 
 void WebContentDecryptionModuleSessionImpl::initializeNewSession(
-    const blink::WebString& mime_type,
-    const uint8* init_data, size_t init_data_length) {
+    const blink::WebString& init_data_type,
+    const uint8* init_data,
+    size_t init_data_length) {
   // TODO(ddorwin): Guard against this in supported types check and remove this.
   // Chromium only supports ASCII MIME types.
-  if (!base::IsStringASCII(mime_type)) {
+  if (!base::IsStringASCII(init_data_type)) {
     NOTREACHED();
-    OnSessionError(media::MediaKeys::kUnknownError, 0);
+    OnSessionError(media::MediaKeys::EXCEPTION_NOT_SUPPORTED_ERROR,
+                   0,
+                   "The initialization data type " + init_data_type.utf8() +
+                       " is not supported by the key system.");
     return;
   }
 
-  adapter_->InitializeNewSession(
-      session_id_, base::UTF16ToASCII(mime_type), init_data, init_data_length);
+  std::string init_data_type_as_ascii = base::UTF16ToASCII(init_data_type);
+  DLOG_IF(WARNING, init_data_type_as_ascii.find('/') != std::string::npos)
+      << "init_data_type '" << init_data_type_as_ascii
+      << "' may be a MIME type";
+
+  scoped_ptr<media::NewSessionCdmPromise> promise(
+      new media::NewSessionCdmPromise(
+          base::Bind(&WebContentDecryptionModuleSessionImpl::SessionCreated,
+                     weak_ptr_factory_.GetWeakPtr()),
+          base::Bind(&WebContentDecryptionModuleSessionImpl::SessionError,

[ddorwin, 2014/05/15 23:15:32]

Once the Blink changes are made, will we construct the promise with a Blink
promise object so that everything gets resolved correctly?

[jrummell, 2014/05/16 00:49:53]

I was just going to pass the blink promise to each method (as part of the Bind,
not an additional class), which would call the appropriate method on it.

+                     weak_ptr_factory_.GetWeakPtr())));
+  adapter_->InitializeNewSession(init_data_type_as_ascii,
+                                 init_data,
+                                 init_data_length,
+                                 media::MediaKeys::SESSION_TYPE_TEMPORARY,
+                                 promise.Pass());
 }
 
 void WebContentDecryptionModuleSessionImpl::update(const uint8* response,
                                                    size_t response_length) {
   DCHECK(response);
-  adapter_->UpdateSession(session_id_, response, response_length);
+  scoped_ptr<media::SimpleCdmPromise> promise(new media::SimpleCdmPromise(
+      base::Bind(&WebContentDecryptionModuleSessionImpl::SessionUpdated,
+                 weak_ptr_factory_.GetWeakPtr()),
+      base::Bind(&WebContentDecryptionModuleSessionImpl::SessionError,
+                 weak_ptr_factory_.GetWeakPtr())));
+  adapter_->UpdateSession(
+      web_session_id_, response, response_length, promise.Pass());
 }
 
 void WebContentDecryptionModuleSessionImpl::release() {
-  adapter_->ReleaseSession(session_id_);
-}
-
-void WebContentDecryptionModuleSessionImpl::OnSessionCreated(
-    const std::string& web_session_id) {
-  // Due to heartbeat messages, OnSessionCreated() can get called multiple
-  // times.
-  // TODO(jrummell): Once all CDMs are updated to support reference ids,
-  // OnSessionCreated() should only be called once, and the second check can be
-  // removed.
-  blink::WebString id = blink::WebString::fromUTF8(web_session_id);
-  DCHECK(web_session_id_.isEmpty() || web_session_id_ == id)
-      << "Session ID may not be changed once set.";
-  web_session_id_ = id;
+  scoped_ptr<media::SimpleCdmPromise> promise(new media::SimpleCdmPromise(
+      base::Bind(&WebContentDecryptionModuleSessionImpl::SessionReleased,
+                 weak_ptr_factory_.GetWeakPtr()),
+      base::Bind(&WebContentDecryptionModuleSessionImpl::SessionError,
+                 weak_ptr_factory_.GetWeakPtr())));
+  adapter_->ReleaseSession(web_session_id_, promise.Pass());
 }
 
 void WebContentDecryptionModuleSessionImpl::OnSessionMessage(
     const std::vector<uint8>& message,
     const std::string& destination_url) {
   client_->message(message.empty() ? NULL : &message[0],
                    message.size(),
                    GURL(destination_url));
 }
 
 void WebContentDecryptionModuleSessionImpl::OnSessionReady() {
   client_->ready();
 }
 
 void WebContentDecryptionModuleSessionImpl::OnSessionClosed() {
   client_->close();
 }
 
 void WebContentDecryptionModuleSessionImpl::OnSessionError(
-    media::MediaKeys::KeyError error_code,
-    uint32 system_code) {
-  client_->error(static_cast<Client::MediaKeyErrorCode>(error_code),
-                 system_code);
+    media::MediaKeys::Exception exception_code,
+    uint32 system_code,
+    const std::string& error_message) {
+  // Convert |exception_code| back to MediaKeyErrorCode if possible.
+  // TODO(jrummell): Update this conversion when promises flow
+  // back into blink:: (as blink:: will have its own error definition).
+  switch (exception_code) {
+    case media::MediaKeys::EXCEPTION_CLIENT_ERROR:
+      client_->error(Client::MediaKeyErrorCodeClient, system_code);
+      break;
+    default:
+      // This will include all other CDM4 errors and any error generated
+      // by CDM5 or later.
+      client_->error(Client::MediaKeyErrorCodeUnknown, system_code);
+      break;
+  }
+}
+
+void WebContentDecryptionModuleSessionImpl::SessionCreated(
+    const std::string& web_session_id) {
+  DCHECK(web_session_id_.empty()) << "Session ID may not be changed once set.";
+  web_session_id_ = web_session_id;
+  adapter_->RegisterSession(web_session_id_, weak_ptr_factory_.GetWeakPtr());
+}
+
+void WebContentDecryptionModuleSessionImpl::SessionUpdated() {
+  // For now, pass back to blink:: as a ready event.
+  OnSessionReady();
+}
+
+void WebContentDecryptionModuleSessionImpl::SessionReleased() {
+  // For now, pass back to blink:: as a closed event.
+  OnSessionClosed();
+}
+
+void WebContentDecryptionModuleSessionImpl::SessionError(
+    media::MediaKeys::Exception exception_code,
+    uint32 system_code,
+    const std::string& error_message) {
+  // For now, just report this as an error back to blink::.
+  OnSessionError(exception_code, system_code, error_message);
 }
 
 }  // namespace content