Core: remove seqNo and sessionId from session file

This commit randomizes SeqNo and SessionID on start this
prevents some errors (code=32) also removes the previous
workaround that was used on CI to prevent these errors.

Author: aarani

src/TgSharp.Core/FileSessionStore.cs

@@ -52,15 +52,6 @@ public static Session FromBytes (byte [] buffer, ISessionStore store, string ses
         {
             using (var stream = new MemoryStream (buffer))
             using (var reader = new BinaryReader (stream)) {
-                var id = reader.ReadUInt64 ();
-                var sequence = reader.ReadInt32 ();
-
-                // we do this in CI when running tests so that the they can always use a
-                // higher sequence than previous run
-#if CI
-                sequence = Session.CurrentTime();
-#endif
-
                 var salt = reader.ReadUInt64 ();
                 var lastMessageId = reader.ReadInt64 ();
                 var timeOffset = reader.ReadInt32 ();
@@ -80,9 +71,7 @@ public static Session FromBytes (byte [] buffer, ISessionStore store, string ses
 
                 return new Session () {
                     AuthKey = new AuthKey (authData),
-                    Id = id,
                     Salt = salt,
-                    Sequence = sequence,
                     LastMessageId = lastMessageId,
                     TimeOffset = timeOffset,
                     SessionExpires = sessionExpires,
@@ -97,8 +86,6 @@ internal byte [] ToBytes (Session session)
         {
             using (var stream = new MemoryStream ())
             using (var writer = new BinaryWriter (stream)) {
-                writer.Write (session.Id);
-                writer.Write (session.Sequence);
                 writer.Write (session.Salt);
                 writer.Write (session.LastMessageId);
                 writer.Write (session.TimeOffset);

src/TgSharp.Core/Session.cs

@@ -54,23 +54,12 @@ public class Session
     {
         internal object Lock = new object ();
 
-        public int Sequence { get; set; }
-#if CI
-            // see the same CI-wrapped assignment in .FromBytes(), but this one will become useful
-            // when we generate a new session.dat for CI again
-            = CurrentTime ();
-
-        // this is similar to the unixTime but rooted on the worst year of humanity instead of 1970
-        internal static int CurrentTime ()
-        {
-            return (int)DateTime.UtcNow.Subtract (new DateTime (2020, 1, 1)).TotalSeconds;
-        }
-#endif
+        public int Sequence { get; set; } = 0;
 
         public string SessionUserId { get; set; }
         internal DataCenter DataCenter { get; set; }
         public AuthKey AuthKey { get; set; }
-        public ulong Id { get; set; }
+        public ulong Id { get; set; } = Utils.Helpers.GenerateRandomUlong();
         public ulong Salt { get; set; }
         public int TimeOffset { get; set; }
         public long LastMessageId { get; set; }