public async Task ReplicationConfig_DailyConfig_LatestShouldGiveStateSequence()
{
Http.HttpHandler.Default = new ReplicationServerMockHttpHandler();
var replicationConfig = new ReplicationConfig("https://planet.openstreetmap.org/replication/day/", 24 * 3600);
var result = await replicationConfig.LatestReplicationState();
Assert.Equal(2569, result.SequenceNumber);
}
/// <summary>
/// Guesses the sequence number for the diff overlapping the given date time.
/// </summary>
/// <param name="config">The replication config.</param>
/// <param name="dateTime">The date time.</param>
/// <returns>The sequence number.</returns>
/// <remarks>This is just a guess because the time doesn't always exactly align with the increase of sequence numbers.</remarks>
public static async Task <long> GuessSequenceNumberAt(this ReplicationConfig config, DateTime dateTime)
{
var latest = await config.LatestReplicationState();
var start = latest.EndTimestamp.AddSeconds(-config.Period);
var diff = (int)(start - dateTime).TotalSeconds;
var leftOver = (diff % config.Period);
var sequenceOffset = (diff - leftOver) / config.Period;
return(latest.SequenceNumber - sequenceOffset - 1);
}
/// <summary>
/// Gets an enumerator to loop over incoming diffs.
/// </summary>
/// <param name="config">The replication config.</param>
/// <param name="sequenceNumber">The sequence number, latest if empty.</param>
/// <returns>The enumerator moved to the given sequence number or null if the sequence number doesn't exist.</returns>
public static async Task <ReplicationDiffEnumerator> GetDiffEnumerator(this ReplicationConfig config,
long?sequenceNumber = null)
{
if (sequenceNumber == null)
{ // get the latest number.
var latest = await config.LatestReplicationState();
sequenceNumber = latest.SequenceNumber;
}
var enumerator = new ReplicationDiffEnumerator(config);
if (!await enumerator.MoveTo(sequenceNumber.Value))
{
return(null);
}
return(enumerator);
}