HostResolver is exposed to plugin.

ppapi/shared_impl/private/ppb_host_resolver_shared.cc

Index: ppapi/shared_impl/private/ppb_host_resolver_shared.cc
diff --git a/ppapi/shared_impl/private/ppb_host_resolver_shared.cc b/ppapi/shared_impl/private/ppb_host_resolver_shared.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b717d32659bc5150d8afd9fc8dec73435f4ab7be
--- /dev/null
+++ b/ppapi/shared_impl/private/ppb_host_resolver_shared.cc
@@ -0,0 +1,99 @@
+// Copyright (c) 2012 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 "ppapi/shared_impl/private/ppb_host_resolver_shared.h"
+
+#include <cstddef>
+#include <cstring>
+
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/shared_impl/private/network_list.h"
+#include "ppapi/shared_impl/var.h"
+#include "ppapi/thunk/thunk.h"
+
+namespace ppapi {
+
+PPB_HostResolver_Shared::PPB_HostResolver_Shared(PP_Instance instance)
+    : Resource(OBJECT_IS_IMPL, instance),
+      host_resolver_id_(GenerateHostResolverID()),
+      resolve_in_progress_(false) {
+}
+
+PPB_HostResolver_Shared::PPB_HostResolver_Shared(
+    const HostResource& resource)
+    : Resource(OBJECT_IS_PROXY, resource),
+      host_resolver_id_(GenerateHostResolverID()),
+      resolve_in_progress_(false) {
+}
+
+PPB_HostResolver_Shared::~PPB_HostResolver_Shared() {
+}
+
+thunk::PPB_HostResolver_Private_API*
+PPB_HostResolver_Shared::AsPPB_HostResolver_Private_API() {
+  return this;
+}
+
+int32_t PPB_HostResolver_Shared::Resolve(
+    const char* host,
+    uint16_t port,
+    const PP_HostResolver_Private_Hint* hint,
+    PP_CompletionCallback callback) {
+  if (!host)
+    return PP_ERROR_BADARGUMENT;
+  if (!callback.func)
+    return PP_ERROR_BLOCKS_MAIN_THREAD;
+  if (resolve_in_progress_)
+    return PP_ERROR_FAILED;
+  if (TrackedCallback::IsPending(resolve_callback_))
+    return PP_ERROR_INPROGRESS;
+
+  resolve_in_progress_ = true;
+  resolve_callback_ = new TrackedCallback(this, callback);
+  SendResolve(host, port, hint);
+  return PP_OK_COMPLETIONPENDING;
+}
+
+uint32_t PPB_HostResolver_Shared::GetSize() {
+  return static_cast<uint32_t>(network_list_.GetSize());
+}
+
+bool PPB_HostResolver_Shared::GetItem(uint32 index,
+                                      PP_Var* canonical_name,
+                                      PP_NetAddress_Private* address) {
+  if (resolve_in_progress_)

[yzshen1, 2012/02/28 08:29:00]

If GetItem() is not allowed while resolving, shall we also disallow GetSize() to
return the previous size?

[ygorshenin1, 2012/02/28 12:09:47]

Done.

+    return false;
+
+  if (index >= network_list_.GetSize())
+    return false;
+
+  std::string name;
+  if (!network_list_.GetItem(index, &name, address))
+    return false;
+
+  if (canonical_name != NULL)

[yzshen1, 2012/02/28 08:29:00]

nit: please be consistent. You could use if (!canonical_name).

[ygorshenin1, 2012/02/28 12:09:47]

Done.

+    *canonical_name = StringVar::StringToPPVar(name);
+  return true;
+}
+
+void PPB_HostResolver_Shared::OnResolveCompleted(
+    bool succeeded,
+    const NetworkList& network_list) {
+  resolve_in_progress_ = false;
+
+  if (succeeded)
+    network_list_ = network_list;
+  else
+    network_list_.Clear();
+
+  TrackedCallback::ClearAndRun(&resolve_callback_,
+                               succeeded ? PP_OK : PP_ERROR_FAILED);
+}
+
+uint32 PPB_HostResolver_Shared::GenerateHostResolverID() {
+  static uint32 host_resolver_id = 0;
+  return host_resolver_id++;
+}
+
+}  // namespace ppapi