HostResolver is exposed to plugin.

ppapi/shared_impl/private/ppb_host_resolver_shared.cc

+// 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 "net/base/sys_addrinfo.h"
+#include "ppapi/c/pp_errors.h"
+#include "ppapi/shared_impl/private/net_address_private_impl.h"
+#include "ppapi/shared_impl/var.h"
+#include "ppapi/thunk/thunk.h"
+
+namespace ppapi {
+
+NetworkList* CreateNetworkListFromAddrInfo(const addrinfo* ai) {
+  scoped_ptr<NetworkList> network_list(new NetworkList());
+  PP_NetAddress_Private address;
+
+  while (ai != NULL) {
+    if (!NetAddressPrivateImpl::SockaddrToNetAddress(
+            ai->ai_addr,

[yzshen1, 2012/03/06 08:07:46]

nit: when calling a method/function, the style guide doesn't require to put each
argument on a separate line. You could arrange them to be more compact (and
still clear to read).
For example:
if (!NetAddressPrivateImpl::SockaddrToNetAddress(
        ai->ai_addr, ai->ai_addrlen, &address)) {

[ygorshenin1, 2012/03/06 10:38:18]

Done.

+            ai->ai_addrlen,
+            &address)) {
+      return NULL;
+    }
+    network_list->push_back(address);
+    ai = ai->ai_next;
+  }
+
+  return network_list.release();
+}
+
+PPB_HostResolver_Shared::PPB_HostResolver_Shared(PP_Instance instance)
+    : Resource(OBJECT_IS_IMPL, instance),
+      host_resolver_id_(GenerateHostResolverID()) {
+}
+
+PPB_HostResolver_Shared::PPB_HostResolver_Shared(
+    const HostResource& resource)
+    : Resource(OBJECT_IS_PROXY, resource),
+      host_resolver_id_(GenerateHostResolverID()) {
+}
+
+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 (ResolveInProgress())
+    return PP_ERROR_INPROGRESS;
+
+  resolve_callback_ = new TrackedCallback(this, callback);
+
+  HostPortPair host_port;
+  host_port.host = host;
+  host_port.port = port;
+
+  SendResolve(host_port, hint);
+  return PP_OK_COMPLETIONPENDING;
+}
+
+PP_Var PPB_HostResolver_Shared::GetCanonicalName() {
+  return StringVar::StringToPPVar(canonical_name_);
+}
+
+uint32_t PPB_HostResolver_Shared::GetSize() {
+  if (ResolveInProgress())
+    return 0;
+  return static_cast<uint32_t>(network_list_.size());
+}
+
+bool PPB_HostResolver_Shared::GetNetAddress(uint32 index,
+                                            PP_NetAddress_Private* address) {
+  if (ResolveInProgress() || index >= network_list_.size())
+    return false;
+  *address = network_list_[index];
+  return true;
+}
+
+void PPB_HostResolver_Shared::OnResolveCompleted(
+    bool succeeded,
+    const std::string& canonical_name,
+    const NetworkList& network_list) {
+  if (succeeded) {
+    canonical_name_ = canonical_name;
+    network_list_ = network_list;
+  } else {
+    canonical_name_.clear();
+    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++;
+}
+
+bool PPB_HostResolver_Shared::ResolveInProgress() const {
+  return TrackedCallback::IsPending(resolve_callback_);
+}
+
+}  // namespace ppapi