/// <summary>
/// Check to see if we have a cache entry - if we do, see if it has expired or not, if it
/// hasn't then return it, otherwise return null.
/// </summary>
/// <param name="context">Current context.</param>
/// <returns>Response or null.</returns>
Response CheckCache(NancyContext context)
{
var cacheKey = context.GetRequestFingerprint();
var cachedSummary = _cache.Get<ResponseSummary>(ResponseCachePartition, cacheKey);
return cachedSummary.HasValue ? cachedSummary.Value.ToResponse() : null;
}
/// <summary>
/// Adds the current response to the cache if required Only stores by Path and stores the
/// response in a KVLite cache.
/// </summary>
/// <param name="context">Current context.</param>
void SetCache(NancyContext context)
{
if (context.Response.StatusCode != HttpStatusCode.OK)
{
return;
}
object cacheSecondsObject;
if (!context.Items.TryGetValue(ContextExtensions.OutputCacheTimeKey, out cacheSecondsObject))
{
return;
}
int cacheSeconds;
if (!int.TryParse(cacheSecondsObject.ToString(), out cacheSeconds))
{
return;
}
// Disable further caching, as it must explicitly enabled.
context.Items.Remove(ContextExtensions.OutputCacheTimeKey);
// The response we are going to cache. We put it here, so that it can be used as
// recovery in the catch clause below.
var responseToBeCached = context.Response;
try
{
var cacheKey = context.GetRequestFingerprint();
var cachedSummary = new ResponseSummary(responseToBeCached);
_cache.AddTimed(ResponseCachePartition, cacheKey, cachedSummary, _cache.Clock.UtcNow.AddSeconds(cacheSeconds));
context.Response = cachedSummary.ToResponse();
}
catch (Exception ex)
{
const string errMsg = "Something bad happened while caching :-(";
LogManager.GetLogger<CachingBootstrapper>().Error(errMsg, ex);
// Sets the old response, hoping it will work...
context.Response = responseToBeCached;
}
}