Adding a mojo interface to the mojo spy.

mojo/spy/spy_server_impl.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 "mojo/spy/spy_server_impl.h"
+
+#include "mojo/public/cpp/bindings/allocation_scope.h"
+#include "mojo/public/cpp/system/core.h"
+
+namespace {
+
+bool NextId(uint32_t* out_id) {
+  static uint32_t id = 1;
+  if (!++id)
+    return false;
+  *out_id = id;
+  return true;
+}
+
+}  // namespace
+
+namespace mojo {
+
+struct SpyServerImpl::Item {
+  enum Type {
+    kServiceIntercept,
+    kMessage
+  };
+
+  uint32_t id;
+  Type type;
+
+  Item(uint32_t id, Type type) : id(id), type(type) {}
+};
+
+SpyServerImpl::SpyServerImpl() : has_session_(false) {
+  BindToPipe(this, pipe_.handle0.Pass());
+}
+
+void SpyServerImpl::StartSession(
+    const spy_api::Version& version,
+    const mojo::Callback<void(spy_api::Result, mojo::String)>& callback) {
+  AllocationScope scope;
+  if (has_session_) {
+    callback.Run(spy_api::RESOURCE_LIMIT, "");
+    return;
+  }
+  callback.Run(spy_api::ALL_OK, "session 0");
+  has_session_ = true;
+}
+
+void SpyServerImpl::StopSession(
+  const mojo::Callback<void(spy_api::Result)>& callback) {
+  AllocationScope scope;
+  if (!has_session_) {
+    callback.Run(spy_api::INVALID_CALL);
+    return;
+  }
+  callback.Run(spy_api::ALL_OK);
+  has_session_ = false;
+}
+
+void SpyServerImpl::TrackConnection(
+  uint32_t id,
+  spy_api::ConnectionOptions options,
+  const mojo::Callback<void(spy_api::Result)>& callback) {
+}
+
+void SpyServerImpl::OnConnectionError() {
+  // Pipe got disconnected.
+}
+
+void SpyServerImpl::OnIntercept(GURL url) {

[darin (slow to review), 2014/05/17 02:37:58]

nit: |const GURL&|

[cpu_(ooo_6.6-7.5), 2014/05/19 20:09:34]

Done.

+  if (!has_session_)
+    return;
+
+  AllocationScope scope;
+  uint32_t id;
+  if (!NextId(&id)) {
+    client()->FatalError(spy_api::NO_MORE_IDS);

[darin (slow to review), 2014/05/17 02:37:58]

is this something you plan to mitigate later or do you expect this will not come
up in practice?

[cpu_(ooo_6.6-7.5), 2014/05/19 20:09:34]

It is an interesting question. In theory the frontend could make me hold to a
copied message forever, so I expect I will run out of ram before I loop around
on ids.

+    return;
+  }
+
+  items_[id] = new Item(id, Item::kServiceIntercept);
+  client()->OnClientConnection(
+      url.possibly_invalid_spec(), id, spy_api::PEEK_MESSAGES);
+}
+
+ScopedMessagePipeHandle SpyServerImpl::ServerPipe() {
+  return ScopedMessagePipeHandle(pipe_.handle1.Pass()).Pass();
+}
+
+}  // namespace mojo