/// <inheritdoc />
public async Task <ReadStreamResult <T> > ReadAsync(ReadStreamQuery query, TimeSpan timeout, CancellationToken cancellationToken = default)
{
var result = await client.ReadAsync(query, settings.ApiKeyProvider(), timeout, cancellationToken).ConfigureAwait(false);
if (!result.IsSuccessful)
{
return(new ReadStreamResult <T>(result.Status, null, result.ErrorDetails));
}
var payload = result.Payload;
try
{
var events = EventsBinaryReader.Read(payload.Content, settings.EventBuilderProvider, log);
return(new ReadStreamResult <T>(result.Status, new ReadStreamPayload <T>(events, payload.Next)));
}
catch (Exception error)
{
log.Warn(error);
return(new ReadStreamResult <T>(HerculesStatus.UnknownError, null, error.Message));
}
finally
{
payload.Dispose();
}
}
protected private async Task <RawReadStreamPayload> ReadAsync(ReadStreamQuery query)
{
using (new OperationContextToken("ReadEvents"))
using (var traceBuilder = tracer.BeginConsumerCustomOperationSpan("Read"))
using (iterationMetric?.For("read_time").Measure())
{
traceBuilder.SetShard(query.ClientShard, query.ClientShardCount);
traceBuilder.SetStream(settings.StreamName);
traceBuilder.SetCoordinates(query.Coordinates);
log.Info(
"Reading {EventsCount} events from stream '{StreamName}'. " +
"Sharding settings: shard with index {ShardIndex} from {ShardCount}. " +
"Coordinates: {StreamCoordinates}.",
query.Limit,
settings.StreamName,
query.ClientShard,
query.ClientShardCount,
query.Coordinates);
traceBuilder.SetOperationDetails(query.Limit);
RawReadStreamResult readResult;
do
{
readResult = await client.ReadAsync(query, settings.ApiKeyProvider(), settings.EventsReadTimeout).ConfigureAwait(false);
if (!readResult.IsSuccessful)
{
log.Warn(
"Failed to read events from Hercules stream '{StreamName}'. " +
"Status: {Status}. Error: '{Error}'.",
settings.StreamName,
readResult.Status,
readResult.ErrorDetails);
await DelayOnError().ConfigureAwait(false);
}
} while (!readResult.IsSuccessful);
log.Info(
"Read {BytesCount} byte(s) from Hercules stream '{StreamName}'.",
readResult.Payload.Content.Count,
settings.StreamName);
return(readResult.Payload);
}
}
