private async Task HandleMessageAsync(Message message, CancellationToken cancellationToken)
{
var formatter = new BinaryFormatter();
if (message.Body == null)
{
await _subClient.AbandonAsync(message.SystemProperties.LockToken);
return;
}
var objectStream = new MemoryStream(message.Body);
var updateEvent = (ContentPageChangeEventArgs)formatter.Deserialize(objectStream);
if (updateEvent.Title == null)
{
_logger.LogWarning($"Changeset {updateEvent.ChangesetId} has null title");
await _subClient.CompleteAsync(message.SystemProperties.LockToken);
return;
}
var prevMeta = _cache.GetPageMetadata(updateEvent.Title);
if (prevMeta != null && prevMeta.ChangeSetId > updateEvent.ChangesetId)
{
_logger.LogWarning($"Update to page {updateEvent.Title} has higher local rev, {prevMeta.ChangeSetId} > {updateEvent.ChangesetId}");
await _subClient.CompleteAsync(message.SystemProperties.LockToken);
return;
}
try
{
var(meta, page) = await _apiClient.GetPageAsync(updateEvent.Title, updateEvent.ChangesetId);
if (meta != null && page != null)
{
_cache.PutPageContent(updateEvent.Title, meta, page);
await _subClient.CompleteAsync(message.SystemProperties.LockToken);
_logger.LogInformation($"Updated page {updateEvent.Title} to rev {updateEvent.ChangesetId}");
}
}
catch (Exception exc)
{
_logger.LogError(exc, "MW getting update failed");
}
}
public async Task <IActionResult> GetPage(string id)
{
if (id != null)
{
// Cache
var cacheContent = _cache.GetPageContent(id);
if (cacheContent != null)
{
return(File(cacheContent, ContentType));
}
var(metadata, newContent) = await _apiService.GetPageAsync(id, null);
if (newContent != null)
{
_cache.PutPageContent(id, metadata, newContent);
return(File(newContent, ContentType));
}
}
return(NotFound());
}