extensions/browser/api/dns/dns_api.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "extensions/browser/api/dns/dns_api.h"
   6
   7 #include "base/bind.h"
   8 #include "base/values.h"
   9 #include "content/public/browser/browser_context.h"
  10 #include "content/public/browser/browser_thread.h"
  11 #include "content/public/browser/resource_context.h"
  12 #include "extensions/browser/api/dns/host_resolver_wrapper.h"
  13 #include "extensions/common/api/dns.h"
  14 #include "net/base/host_port_pair.h"
  15 #include "net/base/net_errors.h"
  16 #include "net/log/net_log.h"
  17
  18 using content::BrowserThread;
  19 using extensions::api::dns::ResolveCallbackResolveInfo;
  20
  21 namespace Resolve = extensions::api::dns::Resolve;
  22
  23 namespace extensions {
  24
  25 DnsResolveFunction::DnsResolveFunction()
  26     : resource_context_(NULL),
  27       response_(false),
  28       request_handle_(new net::HostResolver::RequestHandle()),
  29       addresses_(new net::AddressList) {}
  30
  31 DnsResolveFunction::~DnsResolveFunction() {}
  32
  33 bool DnsResolveFunction::RunAsync() {
  34   scoped_ptr<Resolve::Params> params(Resolve::Params::Create(*args_));
  35   EXTENSION_FUNCTION_VALIDATE(params.get());
  36
  37   hostname_ = params->hostname;
  38   resource_context_ = browser_context()->GetResourceContext();
  39
  40   bool result = BrowserThread::PostTask(
  41       BrowserThread::IO,
  42       FROM_HERE,
  43       base::Bind(&DnsResolveFunction::WorkOnIOThread, this));
  44   DCHECK(result);
  45   return true;
  46 }
  47
  48 void DnsResolveFunction::WorkOnIOThread() {
  49   DCHECK_CURRENTLY_ON(BrowserThread::IO);
  50
  51   net::HostResolver* host_resolver =
  52       HostResolverWrapper::GetInstance()->GetHostResolver(resource_context_);
  53   DCHECK(host_resolver);
  54
  55   // Yes, we are passing zero as the port. There are some interesting but not
  56   // presently relevant reasons why HostResolver asks for the port of the
  57   // hostname you'd like to resolve, even though it doesn't use that value in
  58   // determining its answer.
  59   net::HostPortPair host_port_pair(hostname_, 0);
  60
  61   net::HostResolver::RequestInfo request_info(host_port_pair);
  62   int resolve_result = host_resolver->Resolve(
  63       request_info,
  64       net::DEFAULT_PRIORITY,
  65       addresses_.get(),
  66       base::Bind(&DnsResolveFunction::OnLookupFinished, this),
  67       request_handle_.get(),
  68       net::BoundNetLog());
  69
  70   // Balanced in OnLookupFinished.
  71   AddRef();
  72
  73   if (resolve_result != net::ERR_IO_PENDING)
  74     OnLookupFinished(resolve_result);
  75 }
  76
  77 void DnsResolveFunction::RespondOnUIThread() {
  78   DCHECK_CURRENTLY_ON(BrowserThread::UI);
  79   SendResponse(response_);
  80 }
  81
  82 void DnsResolveFunction::OnLookupFinished(int resolve_result) {
  83   scoped_ptr<ResolveCallbackResolveInfo> resolve_info(
  84       new ResolveCallbackResolveInfo());
  85   resolve_info->result_code = resolve_result;
  86   if (resolve_result == net::OK) {
  87     DCHECK(!addresses_->empty());
  88     resolve_info->address.reset(
  89         new std::string(addresses_->front().ToStringWithoutPort()));
  90   }
  91   results_ = Resolve::Results::Create(*resolve_info);
  92   response_ = true;
  93
  94   bool post_task_result = BrowserThread::PostTask(
  95       BrowserThread::UI,
  96       FROM_HERE,
  97       base::Bind(&DnsResolveFunction::RespondOnUIThread, this));
  98   DCHECK(post_task_result);
  99
 100   Release();  // Added in WorkOnIOThread().
 101 }
 102
 103 }  // namespace extensions