private async Task LoadFromPeerAsync(string key, Stream sink, ICacheControl cacheControl, IGroupCacheClient peerClient, CancellationToken ct)
{
try
{
Stats.TracePeerLoads(_groupName);
using (var validatingSink = CacheEntryValidator.ValidateEntryPassThrough(key, sink))
{
await peerClient.GetAsync(_groupName, key, validatingSink, cacheControl, ct).ConfigureAwait(false);
await validatingSink.ValidateAsync(ct).ConfigureAwait(false);
}
}
catch (CircuitBreakerOpenException)
{
throw; // Dont log CircuitBreakerOpenException
}
catch (InternalServerErrorException internalErrorEx)
{
Logger.Error(String.Format("Call to LoadFromPeer to {0} for Cache {1} key: {2} failed on InternalServerErrorException {3}", peerClient.Endpoint.ToString(), _groupName, key, internalErrorEx.Message));
throw;
}
catch (Exception ex)
{
Logger.Error(ex, String.Format("Call to LoadFromPeer to {0} for Cache {1} key: {2} failed ", peerClient.Endpoint.ToString(), _groupName, key));
throw;
}
}
public async Task GetAsync(string group, string key, Stream sink, ICacheControl cacheControl, CancellationToken ct)
{
try
{
TripIfNeeded();
await _client.GetAsync(group, key, sink, cacheControl, ct).ConfigureAwait(false);
}
catch (ServerBusyException)
{
// Dont count busy server as bad
throw;
}
catch
{
CountFailure();
throw;
}
ResetCount();
}
public void Configuration(IAppBuilder app)
{
app.Run(async context =>
{
var request = context.Request;
var response = context.Response;
var CallCancelled = context.Request.CallCancelled;
var form = await request.ReadFormAsync();
var groupName = form.Get(GROUPNAME);
var key = form.Get(KEY);
if (groupName == null || key == null)
{
response.StatusCode = 400; //BadRequest;
return;
}
response.ContentType = "application/octet-stream";
try
{
var cacheControl = new OwinCacheControl(context.Response.Headers);
await _handler.GetAsync(groupName, key, response.Body, cacheControl, CallCancelled);
}
catch (GroupNotFoundException ex)
{
response.StatusCode = 404;
response.ReasonPhrase = ex.ToString();
}
catch (ServerBusyException busy)
{
response.StatusCode = 503;
response.ReasonPhrase = busy.ToString();
}
catch (Exception ex)
{
response.StatusCode = 500;
response.ReasonPhrase = ex.ToString();
}
});
}