private void GivenCacheKeyFromContext(DownstreamContext context)
{
string generatedCacheKey = _cacheKeyGenerator.GenerateRequestCacheKey(context);
string cachekey = MD5Helper.GenerateMd5("GET-https://some.url/blah?abcd=123");
generatedCacheKey.ShouldBe(cachekey);
}
public async Task Process(HttpContext context, Func <HttpContext, Task> next)
{
var downstreamRoute = context.Items.DownstreamRoute();
if (!downstreamRoute.IsCached)
{
await next.Invoke(context);
return;
}
try
{
var downstreamRequest = context.Items.DownstreamRequest();
var downstreamUrlKey = $"{downstreamRequest.Method}-{downstreamRequest.OriginalString}";
var downStreamRequestCacheKey = _cacheGenerator.GenerateRequestCacheKey(downstreamRequest);
_logger.LogDebug("Started checking cache for {Url}", downstreamUrlKey);
var cached = _outputCache.Get(downStreamRequestCacheKey, downstreamRoute.CacheOptions.Region);
if (cached != null)
{
_logger.LogDebug("cache entry exists for {Url}. Data length {length}", downstreamUrlKey, cached.Body?.Length ?? 0);
context.Response.ContentType = MediaTypeNames.Application.Json;
context.Items.UpsertDownstreamResponse(CreateHttpResponseMessage(cached));
_logger.LogDebug("finished returned cached response for {Url}", downstreamUrlKey);
return;
}
_logger.LogDebug("no response cached for {Url}", downstreamUrlKey);
await next.Invoke(context);
// prevent caching errors
var downstreamResponse = context.Items.DownstreamResponse();
if (downstreamResponse == null || (int)downstreamResponse.StatusCode >= 400)
{
_logger.LogDebug("there was a pipeline error for {Url}", downstreamUrlKey);
return;
}
cached = await CreateCachedResponse(downstreamResponse);
_outputCache.Add(downStreamRequestCacheKey, cached,
TimeSpan.FromSeconds(downstreamRoute.CacheOptions.TtlSeconds),
downstreamRoute.CacheOptions.Region);
_logger.LogDebug("finished response added to cache for {Url}. Data length {length}", downstreamUrlKey, cached?.Body?.Length ?? 0);
}
catch (Exception e)
{
_logger.LogError(e, e.Message);
throw;
}
}
public async Task Invoke(HttpContext httpContext)
{
var downstreamRoute = httpContext.Items.DownstreamRoute();
if (!downstreamRoute.IsCached)
{
await _next.Invoke(httpContext);
return;
}
var downstreamRequest = httpContext.Items.DownstreamRequest();
var downstreamUrlKey = $"{downstreamRequest.Method}-{downstreamRequest.OriginalString}";
string downStreamRequestCacheKey = _cacheGenerator.GenerateRequestCacheKey(downstreamRequest);
Logger.LogDebug($"Started checking cache for {downstreamUrlKey}");
var cached = _outputCache.Get(downStreamRequestCacheKey, downstreamRoute.CacheOptions.Region);
if (cached != null)
{
Logger.LogDebug($"cache entry exists for {downstreamUrlKey}");
var response = CreateHttpResponseMessage(cached);
SetHttpResponseMessageThisRequest(httpContext, response);
Logger.LogDebug($"finished returned cached response for {downstreamUrlKey}");
return;
}
Logger.LogDebug($"no resonse cached for {downstreamUrlKey}");
await _next.Invoke(httpContext);
if (httpContext.Items.Errors().Count > 0)
{
Logger.LogDebug($"there was a pipeline error for {downstreamUrlKey}");
return;
}
var downstreamResponse = httpContext.Items.DownstreamResponse();
cached = await CreateCachedResponse(downstreamResponse);
_outputCache.Add(downStreamRequestCacheKey, cached, TimeSpan.FromSeconds(downstreamRoute.CacheOptions.TtlSeconds), downstreamRoute.CacheOptions.Region);
Logger.LogDebug($"finished response added to cache for {downstreamUrlKey}");
}
