Cache for mDNS records

net/dns/record_parsed.cc

 // Copyright (c) 2013 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 "net/dns/record_parsed.h"
 
+#include "base/logging.h"
 #include "net/dns/dns_response.h"
 #include "net/dns/record_rdata.h"
 
 namespace net {
 
 RecordParsed::RecordParsed(const std::string& name, uint16 type, uint16 klass,
-                           uint32 ttl, scoped_ptr<const RecordRdata> rdata)
-    : name_(name), type_(type), klass_(klass), ttl_(ttl), rdata_(rdata.Pass()) {
+                           uint32 ttl, scoped_ptr<const RecordRdata> rdata,
+                           base::Time time_created)
+    : name_(name), type_(type), klass_(klass), ttl_(ttl), rdata_(rdata.Pass()),
+      time_created_(time_created) {
+}
+
+RecordParsed::RecordParsed(const RecordParsed& other)
+    : name_(other.name_), type_(other.type_), klass_(other.klass_),
+      ttl_(other.ttl_), rdata_(other.rdata_->Copy()),
+      time_created_(other.time_created_) {
 }
 
 RecordParsed::~RecordParsed() {
 }
 
 // static
 scoped_ptr<const RecordParsed> RecordParsed::CreateFrom(
-    DnsRecordParser* parser) {
+    DnsRecordParser* parser,
+    base::Time time_created) {
   DnsResourceRecord record;
   scoped_ptr<const RecordRdata> rdata;
 
   if (!parser->ReadRecord(&record))
     return scoped_ptr<const RecordParsed>();
 
   switch (record.type) {
     case ARecordRdata::kType:
       rdata = ARecordRdata::Create(record.rdata, *parser);
       break;
+    case AAAARecordRdata::kType:
+      rdata = AAAARecordRdata::Create(record.rdata, *parser);
+      break;
     case CnameRecordRdata::kType:
       rdata = CnameRecordRdata::Create(record.rdata, *parser);
       break;
     case PtrRecordRdata::kType:
       rdata = PtrRecordRdata::Create(record.rdata, *parser);
       break;
     case SrvRecordRdata::kType:
       rdata = SrvRecordRdata::Create(record.rdata, *parser);
       break;
     case TxtRecordRdata::kType:
       rdata = TxtRecordRdata::Create(record.rdata, *parser);
       break;
     default:
+      LOG(WARNING) << "Unknown RData type for recieved record: " << record.type;
       return scoped_ptr<const RecordParsed>();
   }
 
   if (!rdata.get())
     return scoped_ptr<const RecordParsed>();
 
   return scoped_ptr<const RecordParsed>(new RecordParsed(record.name,
                                                          record.type,
                                                          record.klass,
                                                          record.ttl,
-                                                         rdata.Pass()));
+                                                         rdata.Pass(),
+                                                         time_created));
+}
+
+bool RecordParsed::IsEqual(const RecordParsed* other, bool is_mdns) const {
+  DCHECK(other);
+  uint16 klass = klass_;
+  uint16 other_klass = other->klass_;
+
+  if (is_mdns) {
+    klass &= dns_protocol::kMDnsClassMask;
+    other_klass &= dns_protocol::kMDnsClassMask;
+  }
+
+  return name_ == other->name_ &&
+      klass == other_klass &&
+      type_ == other->type_ &&
+      rdata_->IsEqual(other->rdata_.get());
 }
 }