added buffer and some error handling

APIThreadBuffer.cs

@@ -0,0 +1,37 @@
+namespace NeDvachAPI
+{
+    public class APIThreadBuffer
+    {
+        private static List<Post> ThreadsPrewievs;
+        private static List<Post>[] Threads = new List<Post>[0];
+        public static void WriteThreadPreviewsBuffer(List<Post> OPPostsToWrite)    //add list of OP-posts and last post to buffer
+        {
+            ThreadsPrewievs = OPPostsToWrite;
+        }
+
+        public static List<Post> GetOPPosts()
+        {
+            return ThreadsPrewievs;
+        }
+
+        public static void WriteThreadsBuffer(List<Post> ThreadToAdd)  //add thread's posts from DB to buffer
+        {
+            Threads = Threads.Append(ThreadToAdd).ToArray();
+        }
+        public static List<Post>  GetThread(int threadId)
+        {
+            if (threadId < Threads.Length + 1 & threadId  != 0)
+            {
+                ;
+                return Threads[threadId - 1];
+
+            }
+            else return null;
+        }
+
+        public static void RefreshThread(int threadId)
+        {
+            Threads[threadId - 1] = DBchat.PostsList("b", threadId);
+        }
+    }
+}

BufferFill.cs

@@ -0,0 +1,20 @@
+namespace NeDvachAPI
+{
+    public class BufferFill
+    {
+
+        public static bool FillBuffer(string board) //method to get buffer of information, which is being ran while API is started
+        {
+            List<Post> posts = DBchat.ThreadsList(board);
+            APIThreadBuffer.WriteThreadPreviewsBuffer(posts);
+            Console.WriteLine("Заполняю буфер оп-постами");
+
+            for (int threadId = 1; threadId <= 4; threadId++)
+            {
+                APIThreadBuffer.WriteThreadsBuffer(DBchat.PostsList(board , threadId));
+                Console.WriteLine("Добавляю буферизую тред " + threadId);
+            }
+            return true; 
+        }
+    }
+}

Controllers/GetPosts.cs

@@ -13,10 +13,7 @@ namespace NeDvachAPI.Controllers
         [HttpGet(Name = "GetPosts")]
         public string Get([FromUri] string board, int thread)
         {
-            string ipAddress = Request.HttpContext.Connection.RemoteIpAddress.ToString();
-            List<Post> posts  = DBchat.PostsList(board, thread);
-            string postsJson = JsonSerializer.Serialize(posts);
-            Console.WriteLine("С адреса " + ipAddress + " запрошен список постов из борды " + board + " и треда# " + thread);
+            string postsJson = JsonSerializer.Serialize(APIThreadBuffer.GetThread(thread));
             return postsJson ;
         }
     }

Controllers/PostPost.cs

@@ -12,8 +12,16 @@ namespace NeDvachAPI.Controllers
         {
             string ipAddress = Request.HttpContext.Connection.RemoteIpAddress.ToString();
             ReceivedPost.Ip = ipAddress;
+            try
+            {
                 DBchat.SendPost(ReceivedPost);
-            return new JsonResult("Posted Successfully!");
+                APIThreadBuffer.RefreshThread(ReceivedPost.Thread_Id);
+                return new JsonResult("Сообщение успешно добавлено.");
+            }
+            catch
+            {
+                return new JsonResult("Произошла ошибка постинга");
+            }
         }
     }
 }

Controllers/ShowThreads.cs

@@ -13,10 +13,7 @@ namespace NeDvachAPI.Controllers
         [HttpGet(Name = "GetThreads")]
         public string Get([FromUri] string board)
         {
-            string ipAddress = Request.HttpContext.Connection.RemoteIpAddress.ToString();
-            List<Post> posts = DBchat.ThreadsList(board);
-            string postsJson = JsonSerializer.Serialize(posts);
-            Console.WriteLine("С адреса " + ipAddress + " запрошен список тредов из борды " + board);
+           string postsJson = JsonSerializer.Serialize(APIThreadBuffer.GetOPPosts());
            return postsJson;
         }
     }

DBchat.cs

@@ -182,7 +182,7 @@ namespace NeDvachAPI
             Console.WriteLine("Данные обновлены!");
             Console.ReadLine();
         }
-        public static void SendPost(Post postToSend)   //добавлялка
+        public static void SendPost(Post postToSend)   //sending post to database
         {
             string connString =
                 String.Format(
@@ -201,7 +201,7 @@ namespace NeDvachAPI
                 int postNum = 14;
 
                 using (var command = new NpgsqlCommand(@"
-                INSERT INTO posts (post_id, post_text, post_number, content, thread_id, auth_ip, post_timestamp) 
+                INSERT INTO posts (post_id, post_text, post_number, content, thread_id, auth_ip, is_op, post_timestamp) 
                 VALUES ( 
                         DEFAULT, 
                         @postText,
@@ -209,6 +209,7 @@ namespace NeDvachAPI
                         @postImgUrl,
                         @threadId,
                         @ip,
+                        false,
                 (
                     SELECT date_trunc(
                         'second',

MinIOchat.cs

@@ -14,7 +14,6 @@ namespace NeDvachAPI
                                   .WithCredentials(AuthInfo.MinIo.username, AuthInfo.MinIo.password)
                                   //.WithSSL()
                                   .Build();
-            //Console.WriteLine(filename);
 
             Aes aesEncryption = Aes.Create();
             aesEncryption.KeySize = 256;
@@ -26,9 +25,7 @@ namespace NeDvachAPI
                                               .WithFileName(fileroute)
                                               .WithContentType("image/png");
                                             //.WithServerSideEncryption(ssec);
-            //Console.WriteLine("Кидаю в minio...");
             await DvachIo.PutObjectAsync(putObjectArgs);
-            //await Task.Delay(5000);
             System.GC.Collect();
             System.GC.WaitForPendingFinalizers();
             File.Delete(fileroute);

Program.cs

@@ -1,12 +1,11 @@
-var builder = WebApplication.CreateBuilder(args);
+using NeDvachAPI;
 
-// Add services to the container.
+var builder = WebApplication.CreateBuilder(args);
 
 builder.Services.AddControllers();
 
 builder.Services.AddEndpointsApiExplorer();
 
-
 builder.Services.AddCors(setup =>
 {
     setup.AddDefaultPolicy(policyBuilder =>
@@ -18,24 +17,21 @@ builder.Services.AddCors(setup =>
 
 });
 
-//builder.Services.AddSwaggerGen();
-
 var app = builder.Build();
 
-// Configure the HTTP request pipeline.
 if (app.Environment.IsDevelopment())
 {
-    //app.UseSwagger();
-    //app.UseSwaggerUI();
+
 }
 
-//app.UseHttpsRedirection();
-
-
 app.UseCors();
 
 app.UseAuthorization();
 
 app.MapControllers();
 
+if (BufferFill.FillBuffer("b"))
+{
     app.Run();
+}
+