public Task <bool> FileExists(string filespaceId, string filename)
{
if (TCCFile.FileCacheable(filename))
{
if (fileCache.TryGetValue(filename, out _))
{
return(Task.FromResult(true));
}
}
return(PathExists(filespaceId, filename));
}
private async Task <Stream> GetFileEx(string filespaceId, string fullName, int retries)
{
Log.LogDebug($"{nameof(GetFileEx)}: filespaceId={filespaceId}, fullName={fullName}, retries={retries}");
byte[] file;
var cacheable = TCCFile.FileCacheable(fullName);
if (cacheable)
{
Log.LogDebug("Trying to extract from cache {0} with cache size {1}", fullName, fileCache.Count);
if (fileCache.TryGetValue(fullName, out file))
{
Log.LogDebug("Serving TCC tile request from cache {0}", fullName);
if (file.Length == 0)
{
Log.LogDebug("Serving TCC tile request from cache empty tile");
return(null);
}
return(new MemoryStream(file));
}
}
var getFileParams = new GetFileParams
{
filespaceid = filespaceId,
path = fullName
};
if (string.IsNullOrEmpty(tccBaseUrl))
{
throw new Exception("Configuration Error - no TCC url specified");
}
var gracefulClient = new GracefulWebRequest(logFactory, configStore, _httpClientFactory);
var(requestString, headers) = FormRequest(getFileParams, "GetFile");
try
{
if (!cacheable)
{
using (var responseStream = await(await gracefulClient.ExecuteRequestAsStreamContent(requestString, HttpMethod.Get, headers, retries: 0)).ReadAsStreamAsync())
{
responseStream.Position = 0;
file = new byte[responseStream.Length];
responseStream.Read(file, 0, file.Length);
return(new MemoryStream(file));
}
}
using (var responseStream = await(await gracefulClient.ExecuteRequestAsStreamContent(requestString, HttpMethod.Get, headers, retries: retries)).ReadAsStreamAsync())
{
Log.LogDebug("Adding TCC tile request to cache {0}", fullName);
responseStream.Position = 0;
file = new byte[responseStream.Length];
responseStream.Read(file, 0, file.Length);
fileCache.Set(fullName, file, DateTimeOffset.MaxValue);
Log.LogDebug("About to extract file name for {0}", fullName);
var baseFileName = TCCFile.ExtractFileNameFromTileFullName(fullName);
Log.LogDebug("Extracted file name is {0}", baseFileName);
cacheLookup.AddFile(baseFileName, fullName);
return(new MemoryStream(file));
}
}
catch (WebException webException)
{
using (var response = webException.Response)
{
Log.LogWarning(
$"Can not execute request TCC request with error {webException.Status} and {webException.Message}. {GetStringFromResponseStream(response)}");
}
//let's cache the response anyway but for a limited time
fileCache.Set(fullName, new byte[0], DateTimeOffset.UtcNow.AddHours(12));
}
catch (Exception e)
{
Log.LogWarning(e, "Can not execute request TCC response.");
}
return(null);
}