private static SyncMemoryProvider AddNewProviderToCache(HttpContext context, CoreProvider provider, Action <SyncConfiguration> conf, Action <SyncOptions> options, string sessionId)
{
SyncMemoryProvider syncMemoryProvider;
var cache = context.RequestServices.GetService <IMemoryCache>();
if (cache == null)
{
throw new SyncException("Cache is not configured! Please add memory cache, distributed or not (see https://docs.microsoft.com/en-us/aspnet/core/performance/caching/response?view=aspnetcore-2.2)");
}
syncMemoryProvider = new SyncMemoryProvider(provider);
syncMemoryProvider.SetConfiguration(conf);
syncMemoryProvider.SetOptions(options);
cache.Set(sessionId, syncMemoryProvider, TimeSpan.FromHours(1));
return(syncMemoryProvider);
}
/// <summary>
/// Call this method to handle requests on the server, sent by the client
/// </summary>
public async Task HandleRequestAsync(HttpContext context, Action <SyncMemoryProvider> action, CancellationToken cancellationToken)
{
var httpRequest = context.Request;
var httpResponse = context.Response;
var streamArray = GetBody(httpRequest);
var serializationFormat = SerializationFormat.Json;
// Get the serialization format
if (TryGetHeaderValue(context.Request.Headers, "dotmim-sync-serialization-format", out var vs))
{
serializationFormat = vs.ToLowerInvariant() == "json" ? SerializationFormat.Json : SerializationFormat.Binary;
}
if (!TryGetHeaderValue(context.Request.Headers, "dotmim-sync-session-id", out var sessionId))
{
throw new SyncException($"Can't find any session id in the header");
}
SyncMemoryProvider syncMemoryProvider = null;
var syncSessionId = "";
HttpMessage httpMessage = null;
try
{
var serializer = BaseConverter <HttpMessage> .GetConverter(serializationFormat);
httpMessage = serializer.Deserialize(streamArray);
syncSessionId = httpMessage.SyncContext.SessionId.ToString();
if (!httpMessage.SyncContext.SessionId.Equals(Guid.Parse(sessionId)))
{
throw new SyncException($"Session id is not matching correctly between header and message");
}
// get cached provider instance if not defined byt web proxy server provider
if (syncMemoryProvider == null)
{
syncMemoryProvider = GetCachedProviderInstance(context, syncSessionId);
}
if (syncMemoryProvider == null)
{
syncMemoryProvider = AddNewProviderToCacheFromDI(context, syncSessionId);
}
// action from user if available
action?.Invoke(syncMemoryProvider);
// get cache manager
// since we are using memorycache, it's not necessary to handle it here
//syncMemoryProvider.LocalProvider.CacheManager = GetCacheManagerInstance(context, syncSessionId);
var httpMessageResponse =
await syncMemoryProvider.GetResponseMessageAsync(httpMessage, cancellationToken);
var binaryData = serializer.Serialize(httpMessageResponse);
await GetBody(httpResponse).WriteAsync(binaryData, 0, binaryData.Length);
}
catch (Exception ex)
{
await WriteExceptionAsync(httpResponse, ex, syncMemoryProvider?.LocalProvider?.ProviderTypeName ?? "ServerLocalProvider");
}
finally
{
if (httpMessage != null && httpMessage.Step == HttpStep.EndSession)
{
Cleanup(context.RequestServices.GetService(typeof(IMemoryCache)), syncSessionId);
}
}
}
