// On Timer, grab items from RSS Feed
public void RSSFeedProcessor(
[TimerTrigger("0 */5 * * * *", RunOnStartup=true)] TimerInfo timer,
[Queue("SaveQuestions")] ICollector<Question> outQ,
TraceWriter log)
{
log.Verbose("RSS Feed Processor started");
Console.WriteLine("RSS Feed Processor started");
foreach (var feeds in mFeedSources)
{
switch(feeds.Key){
case "StackOverflow":
foreach (var feed in feeds.Value) {
try {
using (XmlReader reader = XmlReader.Create(feed.Value)) {
SyndicationFeed rss = SyndicationFeed.Load(reader);
foreach (SyndicationItem item in rss.Items) {
outQ.Add(ProcessStackOverflowEntry(item, feed.Key));
}
}
}
catch (Exception e)
{
log.Error(String.Format("Couldn't read from feed - {0}", feeds.Value), e);
}
}
break;
default:
log.Warning(String.Format("Couldn't recognize feed format: {0}", feeds.Key),"RSSFeedProcessor");
break;
}
}
}
public async Task <bool> RenewAsync(TraceWriter trace, ILogger logger, CancellationToken cancellationToken)
{
try
{
AccessCondition condition = new AccessCondition
{
LeaseId = this.LeaseId
};
DateTimeOffset requestStart = DateTimeOffset.UtcNow;
await this.Blob.RenewLeaseAsync(condition, null, null, cancellationToken);
_lastRenewal = DateTime.UtcNow;
_lastRenewalLatency = _lastRenewal - requestStart;
// The next execution should occur after a normal delay.
return(true);
}
catch (StorageException exception)
{
if (exception.IsServerSideError())
{
string msg = string.Format(CultureInfo.InvariantCulture, "Singleton lock renewal failed for blob '{0}' with error code {1}.",
this.LockId, FormatErrorCode(exception));
trace.Warning(msg, source: TraceSource.Execution);
logger?.LogWarning(msg);
return(false); // The next execution should occur more quickly (try to renew the lease before it expires).
}
else
{
// Log the details we've been accumulating to help with debugging this scenario
int leasePeriodMilliseconds = (int)_leasePeriod.TotalMilliseconds;
string lastRenewalFormatted = _lastRenewal.ToString("yyyy-MM-ddTHH:mm:ss.FFFZ", CultureInfo.InvariantCulture);
int millisecondsSinceLastSuccess = (int)(DateTime.UtcNow - _lastRenewal).TotalMilliseconds;
int lastRenewalMilliseconds = (int)_lastRenewalLatency.TotalMilliseconds;
string msg = string.Format(CultureInfo.InvariantCulture, "Singleton lock renewal failed for blob '{0}' with error code {1}. The last successful renewal completed at {2} ({3} milliseconds ago) with a duration of {4} milliseconds. The lease period was {5} milliseconds.",
this.LockId, FormatErrorCode(exception), lastRenewalFormatted, millisecondsSinceLastSuccess, lastRenewalMilliseconds, leasePeriodMilliseconds);
trace.Error(msg);
logger?.LogError(msg);
// If we've lost the lease or cannot re-establish it, we want to fail any
// in progress function execution
throw;
}
}
}
public async Task <TaskSeriesCommandResult> ExecuteAsync(CancellationToken cancellationToken)
{
TimeSpan delay;
try
{
AccessCondition condition = new AccessCondition
{
LeaseId = _leaseId
};
DateTimeOffset requestStart = DateTimeOffset.UtcNow;
await _leaseBlob.RenewLeaseAsync(condition, null, null, cancellationToken);
_lastRenewal = DateTime.UtcNow;
_lastRenewalLatency = _lastRenewal - requestStart;
// The next execution should occur after a normal delay.
delay = _speedupStrategy.GetNextDelay(executionSucceeded: true);
}
catch (StorageException exception)
{
if (exception.IsServerSideError())
{
// The next execution should occur more quickly (try to renew the lease before it expires).
delay = _speedupStrategy.GetNextDelay(executionSucceeded: false);
_trace.Warning(string.Format(CultureInfo.InvariantCulture, "Singleton lock renewal failed for blob '{0}' with error code {1}. Retry renewal in {2} milliseconds.",
_lockId, FormatErrorCode(exception), delay.TotalMilliseconds), source: TraceSource.Execution);
}
else
{
// Log the details we've been accumulating to help with debugging this scenario
int leasePeriodMilliseconds = (int)_leasePeriod.TotalMilliseconds;
string lastRenewalFormatted = _lastRenewal.ToString("yyyy-MM-ddTHH:mm:ss.FFFZ", CultureInfo.InvariantCulture);
int millisecondsSinceLastSuccess = (int)(DateTime.UtcNow - _lastRenewal).TotalMilliseconds;
int lastRenewalMilliseconds = (int)_lastRenewalLatency.TotalMilliseconds;
_trace.Error(string.Format(CultureInfo.InvariantCulture, "Singleton lock renewal failed for blob '{0}' with error code {1}. The last successful renewal completed at {2} ({3} milliseconds ago) with a duration of {4} milliseconds. The lease period was {5} milliseconds.",
_lockId, FormatErrorCode(exception), lastRenewalFormatted, millisecondsSinceLastSuccess, lastRenewalMilliseconds, leasePeriodMilliseconds));
// If we've lost the lease or cannot re-establish it, we want to fail any
// in progress function execution
throw;
}
}
return(new TaskSeriesCommandResult(wait: Task.Delay(delay)));
}
public void Warning(string message)
{
_logger.Warning(message);
}
