private async Task <List <RecordEntity> > UpdateRecord(DomainEntity domain, List <RecordEntity> records)
{
DnsResponse response = await _dnsRecordClient.GetRecord(domain.Name);
if (IsSuccess(response.ResponseCode))
{
//find old records
List <RecordEntity> oldRecords = records.Where(existingRecord => response.Records.All(responseRecord => !responseRecord.Equals(existingRecord.RecordInfo)))
.Select(_ => new RecordEntity(_.Id, _.Domain, _.RecordInfo, response.ResponseCode, _.FailureCount, DateTime.UtcNow))
.ToList();
//find unchanged records
List <RecordEntity> unchangedRecords = records.Where(existingRecord => response.Records.Any(responseRecord => responseRecord.Equals(existingRecord.RecordInfo))).ToList();
//find new records
List <RecordEntity> newRecords = response.Records.Where(responseRecords => records.All(exisingRecord => !exisingRecord.RecordInfo.Equals(responseRecords)))
.Select(_ => new RecordEntity(null, domain, _, response.ResponseCode, 0))
.ToList();
List <RecordEntity> updatedSuccessfulRecords = oldRecords
.Concat(unchangedRecords)
.Concat(newRecords)
.ToList();
//create placeholder if no records
if (updatedSuccessfulRecords.All(_ => _.EndDate != null))
{
updatedSuccessfulRecords.Add(new RecordEntity(null, domain, null, response.ResponseCode, 0));
}
return(updatedSuccessfulRecords);
}
//Once placeholder in play keep returning placeholder on failure
RecordEntity recordEntity = records.SingleOrDefault(_ => _.FailureCount == -1);
if (recordEntity != null)
{
return(records);
}
//less that 3 failures increment failure count
if (records.Any() && records.Max(_ => _.FailureCount) < 3)
{
return(records.Select(_ => new RecordEntity(_.Id, domain, _.RecordInfo, response.ResponseCode, _.FailureCount + 1)).ToList());
}
//otherwise expire records and add placeholder
return(records.Select(_ => new RecordEntity(_.Id, domain, _.RecordInfo, response.ResponseCode, _.FailureCount, DateTime.UtcNow)).
Concat(new List <RecordEntity> {
new RecordEntity(null, domain, null, response.ResponseCode, -1)
}).ToList());
}
public async Task OldRecordsCorrectlyUpdated()
{
string domain = "a.b.com";
DomainEntity domainEntity = new DomainEntity(1, domain);
DmarcRecordInfo existingRecord = new DmarcRecordInfo("existing record");
Dictionary <DomainEntity, List <RecordEntity> > records = new Dictionary <DomainEntity, List <RecordEntity> >
{
{ domainEntity, new List <RecordEntity> {
new RecordEntity(1, domainEntity, existingRecord, RCode.NoError, 0)
} }
};
A.CallTo(() => _dnsRecordClient.GetRecord(domain)).Returns(Task.FromResult(new DnsResponse(new List <RecordInfo> {
DmarcRecordInfo.EmptyRecordInfo
}, RCode.NoError)));
List <RecordEntity> updatedRecords = await _dnsRecordsUpdater.UpdateRecord(records);
Assert.That(updatedRecords.Count, Is.EqualTo(2));
Assert.That(updatedRecords[0].EndDate, Is.Not.Null);
Assert.That(updatedRecords[0].RecordInfo, Is.EqualTo(existingRecord));
}