First cut at "content handling" support in Mojo.

mojo/examples/content_handler_demo/content_handler_demo.cc

+// 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 <stdio.h>
+
+#include "mojo/public/cpp/application/application_delegate.h"
+#include "mojo/public/cpp/application/application_impl.h"
+#include "mojo/public/cpp/application/interface_factory_with_context.h"
+#include "mojo/services/public/interfaces/content_handler/content_handler.mojom.h"
+
+namespace mojo {
+namespace examples {
+
+class ContentHandlerApp;
+
+class ContentHandlerImpl : public InterfaceImpl<ContentHandler> {
+ public:
+  explicit ContentHandlerImpl(ContentHandlerApp* content_handler_app)
+      : content_handler_app_(content_handler_app) {
+  }
+  virtual ~ContentHandlerImpl() {}
+
+ private:
+  virtual void OnConnect(const mojo::String& url,
+                         URLResponsePtr content,
+                         ServiceProviderPtr service_provider) MOJO_OVERRIDE;
+
+  ContentHandlerApp* content_handler_app_;
+};
+
+class ContentHandlerApp
+    : public ApplicationDelegate,
+      public InterfaceFactoryWithContext<ContentHandlerImpl,
+                                         ContentHandlerApp> {
+ public:
+  ContentHandlerApp() : InterfaceFactoryWithContext(this) {
+  }
+
+  virtual void Initialize(ApplicationImpl* app) MOJO_OVERRIDE {
+  }
+
+  virtual bool ConfigureIncomingConnection(ApplicationConnection* connection)
+      MOJO_OVERRIDE {
+    connection->AddService(this);
+    return true;
+  }
+
+  void PrintResponse(ScopedDataPipeConsumerHandle body) const {
+    for (;;) {
+      char buf[512];
+      uint32_t num_bytes = sizeof(buf);
+      MojoResult result = ReadDataRaw(body.get(), buf, &num_bytes,
+                                      MOJO_READ_DATA_FLAG_NONE);
+      if (result == MOJO_RESULT_SHOULD_WAIT) {
+        Wait(body.get(),
+             MOJO_HANDLE_SIGNAL_READABLE,
+             MOJO_DEADLINE_INDEFINITE);
+      } else if (result == MOJO_RESULT_OK) {
+        if (fwrite(buf, num_bytes, 1, stdout) != 1) {
+          printf("\nUnexpected error writing to file\n");
+          break;
+        }
+      } else {
+        break;
+      }
+
+      printf("\n>>> EOF <<<\n");
+    }
+  }
+};
+
+void ContentHandlerImpl::OnConnect(const mojo::String& url,
+                                   URLResponsePtr content,
+                                   ServiceProviderPtr service_provider) {
+  printf("ContentHandler::OnConnect - url:%s - body follows\n\n",
+         url.To<std::string>().c_str());
+  content_handler_app_->PrintResponse(content->body.Pass());
+}
+
+}  // namespace examples
+
+// static
+ApplicationDelegate* ApplicationDelegate::Create() {
+  return new examples::ContentHandlerApp();
+}
+
+}  // namespace mojo