headless: Initial headless embedder API implementation

headless/lib/browser/headless_devtools.cc

Index: headless/lib/browser/headless_devtools.cc
diff --git a/headless/lib/browser/headless_devtools.cc b/headless/lib/browser/headless_devtools.cc
new file mode 100644
index 0000000000000000000000000000000000000000..36369664a719a10337af7c266383a55343b30e7c
--- /dev/null
+++ b/headless/lib/browser/headless_devtools.cc
@@ -0,0 +1,101 @@
+// 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 "headless/lib/browser/headless_devtools.h"
+
+#include "base/files/file_path.h"
+#include "components/devtools_http_handler/devtools_http_handler.h"
+#include "components/devtools_http_handler/devtools_http_handler_delegate.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/devtools_frontend_host.h"
+#include "content/public/browser/navigation_entry.h"
+#include "headless/lib/browser/headless_browser_context.h"
+#include "net/base/net_errors.h"
+#include "net/socket/tcp_server_socket.h"
+#include "ui/base/resource/resource_bundle.h"
+
+using devtools_http_handler::DevToolsHttpHandler;
+
+namespace headless {
+
+namespace {
+
+const int kBackLog = 10;
+
+class TCPServerSocketFactory : public DevToolsHttpHandler::ServerSocketFactory {
+ public:
+  TCPServerSocketFactory(const std::string& address, uint16_t port)
+      : address_(address), port_(port) {}
+
+ private:
+  // DevToolsHttpHandler::ServerSocketFactory implementation:
+  scoped_ptr<net::ServerSocket> CreateForHttpServer() override {
+    scoped_ptr<net::ServerSocket> socket(
+        new net::TCPServerSocket(nullptr, net::NetLog::Source()));
+    if (socket->ListenWithAddressAndPort(address_, port_, kBackLog) != net::OK)
+      return scoped_ptr<net::ServerSocket>();
+
+    return socket;
+  }
+
+  std::string address_;
+  uint16_t port_;
+
+  DISALLOW_COPY_AND_ASSIGN(TCPServerSocketFactory);
+};
+
+class HeadlessDevToolsDelegate
+    : public devtools_http_handler::DevToolsHttpHandlerDelegate {
+ public:
+  HeadlessDevToolsDelegate();
+  ~HeadlessDevToolsDelegate() override;
+
+  // devtools_http_handler::DevToolsHttpHandlerDelegate implementation:
+  std::string GetDiscoveryPageHTML() override;
+  std::string GetFrontendResource(const std::string& path) override;
+  std::string GetPageThumbnailData(const GURL& url) override;
+  content::DevToolsExternalAgentProxyDelegate* HandleWebSocketConnection(
+      const std::string& path) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(HeadlessDevToolsDelegate);
+};
+
+HeadlessDevToolsDelegate::HeadlessDevToolsDelegate() {}
+
+HeadlessDevToolsDelegate::~HeadlessDevToolsDelegate() {}
+
+std::string HeadlessDevToolsDelegate::GetDiscoveryPageHTML() {
+  return std::string();
+}
+
+std::string HeadlessDevToolsDelegate::GetFrontendResource(
+    const std::string& path) {
+  return content::DevToolsFrontendHost::GetFrontendResource(path).as_string();
+}
+
+std::string HeadlessDevToolsDelegate::GetPageThumbnailData(const GURL& url) {
+  return std::string();
+}
+
+content::DevToolsExternalAgentProxyDelegate*
+HeadlessDevToolsDelegate::HandleWebSocketConnection(const std::string& path) {
+  return nullptr;
+}
+
+}  // namespace
+
+scoped_ptr<DevToolsHttpHandler> CreateHttpHandler(
+    HeadlessBrowserContext* browser_context) {
+  int port = browser_context->options().devtools_http_port;
+  DCHECK_GE(port, 0);
+  scoped_ptr<DevToolsHttpHandler::ServerSocketFactory> socket_factory(
+      new TCPServerSocketFactory("127.0.0.1", port));

[alex clarke (OOO till 29th), 2016/02/10 17:49:22]

I'm not sure how this is used yet, although I hope we can avoid the embedder
having to use localhost sockets.

[Sami, 2016/02/10 18:47:38]

Right, the embedder would only use this if they actually had another app talking
to the browser via the socket (e.g., WebDriver). We'll add a separate API for
direct access.

+  return make_scoped_ptr(new DevToolsHttpHandler(
+      std::move(socket_factory), std::string(), new HeadlessDevToolsDelegate(),
+      browser_context->GetPath(), base::FilePath(), std::string(),
+      browser_context->options().user_agent));
+}
+
+}  // namespace headless