[DevTools] Move IO and Tracing to new generator.

content/browser/devtools/protocol/io_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/io_handler.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/files/file.h"
 #include "base/files/file_util.h"
 #include "base/memory/ref_counted_delete_on_message_loop.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/string_number_conversions.h"
 #include "content/browser/devtools/devtools_io_context.h"
 #include "content/public/browser/browser_thread.h"
 
 namespace content {
-namespace devtools {
-namespace io {
-
-using Response = DevToolsProtocolClient::Response;
+namespace protocol {
 
 IOHandler::IOHandler(DevToolsIOContext* io_context)
     : io_context_(io_context)
     , weak_factory_(this) {}
 
 IOHandler::~IOHandler() {}
 
-void IOHandler::SetClient(std::unique_ptr<Client> client) {
-  client_.swap(client);
+void IOHandler::Wire(UberDispatcher* dispatcher) {
+  frontend_.reset(new IO::Frontend(dispatcher->channel()));
+  IO::Dispatcher::wire(dispatcher, this);
 }
 
-Response IOHandler::Read(DevToolsCommandId command_id,
-    const std::string& handle, const int* offset, const int* max_size) {
+Response IOHandler::Disable() {
+  return Response::OK();
+}
+
+void IOHandler::Read(
+    const std::string& handle,
+    Maybe<int> offset,
+    Maybe<int> max_size,
+    std::unique_ptr<ReadCallback> callback) {
   static const size_t kDefaultChunkSize = 10 * 1024 * 1024;
 
   scoped_refptr<DevToolsIOContext::Stream> stream =
       io_context_->GetByHandle(handle);
-  if (!stream)
-    return Response::InvalidParams("Invalid stream handle");
-  stream->Read(offset ? *offset : -1,
-               max_size && *max_size ? *max_size : kDefaultChunkSize,
+  if (!stream) {
+    callback->sendFailure(Response::Error("Invalid stream handle"));

[caseq, 2016/11/15 18:33:59]

let's keep different error codes -- just make a method for each different error,
and keep the error text for humans.

[dgozman, 2016/11/17 21:51:07]

Done.

+    return;
+  }
+  stream->Read(offset.fromMaybe(-1),
+               max_size.fromMaybe(kDefaultChunkSize),
                base::Bind(&IOHandler::ReadComplete,
-                          weak_factory_.GetWeakPtr(), command_id));
-  return Response::OK();
+                          weak_factory_.GetWeakPtr(),
+                          base::Passed(std::move(callback))));
 }
 
-void IOHandler::ReadComplete(DevToolsCommandId command_id,
+void IOHandler::ReadComplete(std::unique_ptr<ReadCallback> callback,
                              const scoped_refptr<base::RefCountedString>& data,
                              int status) {
   if (status == DevToolsIOContext::Stream::StatusFailure) {
-    client_->SendError(command_id, Response::ServerError("Read failed"));
+    callback->sendFailure(Response::Error("Read failed"));
     return;
   }
   bool eof = status == DevToolsIOContext::Stream::StatusEOF;
-  client_->SendReadResponse(command_id,
-      ReadResponse::Create()->set_data(data->data())->set_eof(eof));
+  callback->sendSuccess(data->data(), eof);
 }
 
 Response IOHandler::Close(const std::string& handle) {
   return io_context_->Close(handle) ? Response::OK()
-      : Response::InvalidParams("Invalid stream handle");
+      : Response::Error("Invalid stream handle");
 }
 
-}  // namespace io
-}  // namespace devtools
+}  // namespace protocol
 }  // namespace content