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오부경's avatar
오부경
Explorer | Level 4
9 years ago

longpoll api returns always true when I added shared folder to my drive

When I added shared folder to my drive, longpoll api immediately returns true (no wait). list_folder api for root folder returns new cursor and longpoll api by root cursor returns true. When it ret...
API
오부경's avatar
오부경
Explorer | Level 4
9 years ago

I build test code and only run Test function.

Thanks you.

 

 

// for TEST
public class MyDropBoxFile
{
 public string Filename;
 public string Cursor;
 public MyDropBoxFile(string path)
 {
  Filename = path;
 }
}
//
internal List<object> GetFolderList(MyDropBoxFile PathFile)
{
 List<object> dataList = new List<object>();
 string path = PathFile.Filename;
 if (path == "/")
  path = String.Empty;
 Task task = Task.Run(async () =>
 {
  try
  {
   ListFolderResult result = await Client.Files.ListFolderAsync(path).ConfigureAwait(false);
   while (result != null)
   {
    if (String.IsNullOrEmpty(result.Cursor) == false)
    {
     Program.LOGDEBUG("ListFolderAsync result cursor : " + result.Cursor);
     PathFile.Cursor = result.Cursor; // Keep cursor
    }
    else
    {
     Program.LOGDEBUG("ListFolderAsync result cursor is empty");
    }
    foreach (Metadata file in result.Entries)
    {
     dataList.Add(file);
    }
    if (result.HasMore)
    {
     Program.LOGDEBUG("ListFolderAsync result HasMore is true");
     result = await Client.Files.ListFolderContinueAsync(new ListFolderContinueArg(result.Cursor));
    }
    else
    {
     Program.LOGDEBUG("ListFolderAsync result HasMore is false");
     break;
    }
   }
  }
  catch (Exception ex)
  {
   Program.LOGERROR("ListFolderAsync Fail : Exception : " + ex.Message);
  }
 });
 task.Wait();
 return dataList;
}
internal bool IsChanged(MyDropBoxFile PathFile)
{
 bool Changed = false;
 Task task = Task.Run(async () =>
 {
  try
  {
   var longpoll = await Client.Files.ListFolderLongpollAsync(PathFile.Cursor);
   Changed = longpoll.Changes;
  }
  catch (Exception ex)
  {
   Program.LOGERROR("ListFolderLongpollAsync Fail : " + ex.Message);
  }
 });
 task.Wait();
 return Changed;
}
void Test()
{
 MyDropBoxFile file = new MyDropBoxFile("/");
 GetFolderList(file);
 Program.LOGDEBUG("GetFolderList CURSOR : " + file.Cursor);
 for (int i = 0; i < 10; i++)
 {
  if (IsChanged(file))
  {
   Program.LOGDEBUG("IsChanged returns true");
   GetFolderList(file);
   Program.LOGDEBUG("GetFolderList CURSOR : " + file.Cursor);
  }
  else
  {
   Program.LOGDEBUG("IsChanged returns false");
  }
  Thread.Sleep(3000);
 }
}
//==================

 

TESTCASE 1: If i added a shared folder(read/write access) to my drive. OUTPUT:

2017-06-27 13:23:30,920 [DEBUG] ListFolderAsync result cursor : AAGc5OGsaskkYUu4aRmfOmV3SkjpOcNfdg9w6bHlb65ScaDhZaOo6Hd7OGcDX-nVY0C7mbPWZvE2PmIax7exm43-fIxMLaE_F0kngVyQO_kil59gGApZwfO-BB9gWrlqnjkcnw-qsqUbKq_mry6FzUo9-3f12V3cq7VlQCdXa93pm1K-xa974lFrElc9YeQLQKmFd57JkWSo0qOCVmko2L72
2017-06-27 13:23:30,920 [DEBUG] ListFolderAsync result HasMore is false
2017-06-27 13:23:30,920 [DEBUG] GetFolderList CURSOR : AAGc5OGsaskkYUu4aRmfOmV3SkjpOcNfdg9w6bHlb65ScaDhZaOo6Hd7OGcDX-nVY0C7mbPWZvE2PmIax7exm43-fIxMLaE_F0kngVyQO_kil59gGApZwfO-BB9gWrlqnjkcnw-qsqUbKq_mry6FzUo9-3f12V3cq7VlQCdXa93pm1K-xa974lFrElc9YeQLQKmFd57JkWSo0qOCVmko2L72
2017-06-27 13:23:31,783 [DEBUG] IsChanged returns true
2017-06-27 13:23:32,183 [DEBUG] ListFolderAsync result cursor : AAHu00Dl5aNvLxjYe12hvAU89ZjnRZD4N0yKY1TPPOautM6Bfk1Z_Ov8Cegh_4k9KlYMz6mlVQkcU-rpf4K-31tsCXyWv-J2OEYFUvD1P6mfzfArURF_BoBdD3NbC_cd0qS74VnnNdGxiO9Qe9JWKvqCmdo4lfiAdrmyaH9rCWQOaDJ0uVlK5DZYBtcxKa4EKfW4CfSjiYhmcWuSNkpoox-d
2017-06-27 13:23:32,183 [DEBUG] ListFolderAsync result HasMore is false
2017-06-27 13:23:32,199 [DEBUG] GetFolderList CURSOR : AAHu00Dl5aNvLxjYe12hvAU89ZjnRZD4N0yKY1TPPOautM6Bfk1Z_Ov8Cegh_4k9KlYMz6mlVQkcU-rpf4K-31tsCXyWv-J2OEYFUvD1P6mfzfArURF_BoBdD3NbC_cd0qS74VnnNdGxiO9Qe9JWKvqCmdo4lfiAdrmyaH9rCWQOaDJ0uVlK5DZYBtcxKa4EKfW4CfSjiYhmcWuSNkpoox-d
2017-06-27 13:23:35,556 [DEBUG] IsChanged returns true
2017-06-27 13:23:35,909 [DEBUG] ListFolderAsync result cursor : AAHNmC3IA4hHEYmji8hV0PSkp58gcJHHsq1rRuE1LuUFk7hudcMOYCajiqHhHzt-Zygdj27kUgxfRW4sViv-d_yPFcbSVTQT7BeoOBEaEnU6yRc6kMquR0svOhmMq3A4OW_HEnEwwKm1vWfBB79SEMR3Z_NVbUNUnzbhgQRGzi8RuQe59vuQF1cCyW9ebLwfLTCDSG_7lvy0TnUK1VtI5fwH
2017-06-27 13:23:35,909 [DEBUG] ListFolderAsync result HasMore is false
2017-06-27 13:23:35,925 [DEBUG] GetFolderList CURSOR : AAHNmC3IA4hHEYmji8hV0PSkp58gcJHHsq1rRuE1LuUFk7hudcMOYCajiqHhHzt-Zygdj27kUgxfRW4sViv-d_yPFcbSVTQT7BeoOBEaEnU6yRc6kMquR0svOhmMq3A4OW_HEnEwwKm1vWfBB79SEMR3Z_NVbUNUnzbhgQRGzi8RuQe59vuQF1cCyW9ebLwfLTCDSG_7lvy0TnUK1VtI5fwH
2017-06-27 13:23:39,291 [DEBUG] IsChanged returns true
2017-06-27 13:23:39,691 [DEBUG] ListFolderAsync result cursor : AAHSnSi_2OBrCp9A2sKf4spo-_2wg01q3ldglng6S1UaOlsrw-slvhKL5NCZtOskjG4HZ9ZC5VIaEzISTWy3su-Qgy57OUMHGRBCmtgVFZfieQfknrYJNPSKliJwCsxPjzQZaggIu_F9wK9yqadkiMptttOTqwn4Bm18b50WgxfRqIKi_PucHSmHp8yA2QTaoT_DTOCw_S48Qdq_6oci92e-
2017-06-27 13:23:39,691 [DEBUG] ListFolderAsync result HasMore is false
2017-06-27 13:23:39,691 [DEBUG] GetFolderList CURSOR : AAHSnSi_2OBrCp9A2sKf4spo-_2wg01q3ldglng6S1UaOlsrw-slvhKL5NCZtOskjG4HZ9ZC5VIaEzISTWy3su-Qgy57OUMHGRBCmtgVFZfieQfknrYJNPSKliJwCsxPjzQZaggIu_F9wK9yqadkiMptttOTqwn4Bm18b50WgxfRqIKi_PucHSmHp8yA2QTaoT_DTOCw_S48Qdq_6oci92e-
2017-06-27 13:23:43,063 [DEBUG] IsChanged returns true
2017-06-27 13:23:43,447 [DEBUG] ListFolderAsync result cursor : AAGWl4_PXFJ7EgSQU7fSg1FMc08xQtvFzuFADLMVuwqOpCNVZw8HEgjkKIsZUapF4J52tD9VtHEZ1Vlb4R3UdhB9zR_9bf-uvRhlwjkod8XImUsoMc1VzKy-FBIvbPh5bqXp_QrwOjLXpqEASVDa5_0pAOVUdqJQSXFZEPHnd8vhpVmhIenvrQLj47a-A7-ilvmfG_gGmA--QyuO1leasLnn
2017-06-27 13:23:43,447 [DEBUG] ListFolderAsync result HasMore is false
2017-06-27 13:23:43,447 [DEBUG] GetFolderList CURSOR : AAGWl4_PXFJ7EgSQU7fSg1FMc08xQtvFzuFADLMVuwqOpCNVZw8HEgjkKIsZUapF4J52tD9VtHEZ1Vlb4R3UdhB9zR_9bf-uvRhlwjkod8XImUsoMc1VzKy-FBIvbPh5bqXp_QrwOjLXpqEASVDa5_0pAOVUdqJQSXFZEPHnd8vhpVmhIenvrQLj47a-A7-ilvmfG_gGmA--QyuO1leasLnn
2017-06-27 13:23:46,819 [DEBUG] IsChanged returns true
2017-06-27 13:23:47,235 [DEBUG] ListFolderAsync result cursor : AAFmQ-D-iKpaRuup7hlIxrYeYKkUNXxkyHPFdpeKBDecLzh0QeDeHeMbkXtsZQVtLbiEmsqgc4sh9oq0tMHockcVCHHQYTXq01__cBpeHBFLlLfVyeXqpmdBKafNoTQdWKEALkbTNssgP1aZvWFRGYP2dlU1RI8GqOu_VuMX0d3O3L-i7ZCTOS2Td6XYbaMBbURqf3m4NdWhQU5G89hwyfA9
2017-06-27 13:23:47,235 [DEBUG] ListFolderAsync result HasMore is false
2017-06-27 13:23:47,235 [DEBUG] GetFolderList CURSOR : AAFmQ-D-iKpaRuup7hlIxrYeYKkUNXxkyHPFdpeKBDecLzh0QeDeHeMbkXtsZQVtLbiEmsqgc4sh9oq0tMHockcVCHHQYTXq01__cBpeHBFLlLfVyeXqpmdBKafNoTQdWKEALkbTNssgP1aZvWFRGYP2dlU1RI8GqOu_VuMX0d3O3L-i7ZCTOS2Td6XYbaMBbURqf3m4NdWhQU5G89hwyfA9
2017-06-27 13:23:50,615 [DEBUG] IsChanged returns true
2017-06-27 13:23:51,021 [DEBUG] ListFolderAsync result cursor : AAFnYct-TkyTGcD8pDozc9wiKBQL2kNDgFrMJYLg1GY33UMsFoD976SYY4pe8xP6aa0Bus5TWN8yMsPQeNx1N0SrDGIkme_LQtk2mnmfrCtHspJrrCp0qHt8TM4eG7HrVPpWWag2XVIkPX7e8E0GjcFv4uBHwoyiG5kcXsNwivO5l2d_hD-ZUAexTNqOM60dKbg0AjmjYqDHOFzLew3wG_3g
2017-06-27 13:23:51,021 [DEBUG] ListFolderAsync result HasMore is false
2017-06-27 13:23:51,037 [DEBUG] GetFolderList CURSOR : AAFnYct-TkyTGcD8pDozc9wiKBQL2kNDgFrMJYLg1GY33UMsFoD976SYY4pe8xP6aa0Bus5TWN8yMsPQeNx1N0SrDGIkme_LQtk2mnmfrCtHspJrrCp0qHt8TM4eG7HrVPpWWag2XVIkPX7e8E0GjcFv4uBHwoyiG5kcXsNwivO5l2d_hD-ZUAexTNqOM60dKbg0AjmjYqDHOFzLew3wG_3g
2017-06-27 13:23:54,420 [DEBUG] IsChanged returns true
2017-06-27 13:23:54,771 [DEBUG] ListFolderAsync result cursor : AAFSGLFZByg4yBITx8a158MhwUWtLeum2HHEkQpScrK4rZ-UioWqHS475zeh9rrt7I5L9xhc-9ZGZGalYlMOGgTff80z7JeWkCJpnMMmuMHpw5jrsCu0sUZY6Yj7oOUuDAdr-Hwhgh8hEM3z54KIba72T_IVpemprW4qgVJsvWb9gAk_ph-11Ji6T2qPSlGtLzOODhYeLFrKUSZpsBM24VCl
2017-06-27 13:23:54,786 [DEBUG] ListFolderAsync result HasMore is false
2017-06-27 13:23:54,786 [DEBUG] GetFolderList CURSOR : AAFSGLFZByg4yBITx8a158MhwUWtLeum2HHEkQpScrK4rZ-UioWqHS475zeh9rrt7I5L9xhc-9ZGZGalYlMOGgTff80z7JeWkCJpnMMmuMHpw5jrsCu0sUZY6Yj7oOUuDAdr-Hwhgh8hEM3z54KIba72T_IVpemprW4qgVJsvWb9gAk_ph-11Ji6T2qPSlGtLzOODhYeLFrKUSZpsBM24VCl
2017-06-27 13:23:58,158 [DEBUG] IsChanged returns true
2017-06-27 13:23:58,527 [DEBUG] ListFolderAsync result cursor : AAEgJPkNvGsgId0qiFBhKpK9-ikvAlriI5JP_-eImvMdMquyfpWJZUPtz-YsZTj_CKmgOAgfg3m2YlPDzDnQu6o8sLg67z2-ggm60f0d6CaM4PDOLkp6sDeypTad1Fw-8VHR2AXMIgqwVtycPosTCi6hjQJg34wyg775-jNXU7WgRfBHBHGAFFjJGc6FlWy4eiJZTrj6WonGakEE0eocU8Yu
2017-06-27 13:23:58,527 [DEBUG] ListFolderAsync result HasMore is false
2017-06-27 13:23:58,527 [DEBUG] GetFolderList CURSOR : AAEgJPkNvGsgId0qiFBhKpK9-ikvAlriI5JP_-eImvMdMquyfpWJZUPtz-YsZTj_CKmgOAgfg3m2YlPDzDnQu6o8sLg67z2-ggm60f0d6CaM4PDOLkp6sDeypTad1Fw-8VHR2AXMIgqwVtycPosTCi6hjQJg34wyg775-jNXU7WgRfBHBHGAFFjJGc6FlWy4eiJZTrj6WonGakEE0eocU8Yu
2017-06-27 13:24:01,892 [DEBUG] IsChanged returns true
2017-06-27 13:24:02,262 [DEBUG] ListFolderAsync result cursor : AAGaM9u4S5fYS4Lk0MBDsWxaRRcQytzhRD-XF9IgF5ZrjMnFH3gXjHkWNQn8MI_jFK8pgWoWR97Er0OUk8pqGuzO2f4M9S_a0PCBasqEBZ4P6F0Msw3s9tAxBhW6SW-kzReWR9Pz-WXRioaC2IxaLx3RJsUNNRbaS-XM8jJQbM0h7zccV1eF60KxM0ParoM9A_5fQrIbkzheGkGbXXsQIuHG
2017-06-27 13:24:02,262 [DEBUG] ListFolderAsync result HasMore is false
2017-06-27 13:24:02,262 [DEBUG] GetFolderList CURSOR : AAGaM9u4S5fYS4Lk0MBDsWxaRRcQytzhRD-XF9IgF5ZrjMnFH3gXjHkWNQn8MI_jFK8pgWoWR97Er0OUk8pqGuzO2f4M9S_a0PCBasqEBZ4P6F0Msw3s9tAxBhW6SW-kzReWR9Pz-WXRioaC2IxaLx3RJsUNNRbaS-XM8jJQbM0h7zccV1eF60KxM0ParoM9A_5fQrIbkzheGkGbXXsQIuHG
2017-06-27 13:24:05,635 [DEBUG] IsChanged returns true
2017-06-27 13:24:06,013 [DEBUG] ListFolderAsync result cursor : AAHGWo0QMte94lLPvPGVN8BEuBQzkBUXSR546pLdlDDN7RWI-TG76CNFqqLXOWmhbNWAbEsZrJhwreaxssZCAKQxnlAsABXyxf-7MEZARbkL4cdpSSoAfbS9izRIrrvOOsRwacbje-xqrooC4UkuTBfpQkCZDGeccULXJKSUobU54ma0EVZYIN9WsEuwwnmWRB_0zTJU5BtwFBrbRxAr4A-c
2017-06-27 13:24:06,013 [DEBUG] ListFolderAsync result HasMore is false
2017-06-27 13:24:06,013 [DEBUG] GetFolderList CURSOR : AAHGWo0QMte94lLPvPGVN8BEuBQzkBUXSR546pLdlDDN7RWI-TG76CNFqqLXOWmhbNWAbEsZrJhwreaxssZCAKQxnlAsABXyxf-7MEZARbkL4cdpSSoAfbS9izRIrrvOOsRwacbje-xqrooC4UkuTBfpQkCZDGeccULXJKSUobU54ma0EVZYIN9WsEuwwnmWRB_0zTJU5BtwFBrbRxAr4A-c

TESTCASE 2 : Just remove a shared folder from my drive and test again. OUTOUT:
2017-06-27 13:27:14,896 [DEBUG] ListFolderAsync result cursor : AAHA6xuh9msxmApG3USBbTi6tOyaowlz-ZbSuoH3HjFyQ_eymn-YII03nNmuAD0ltM7w9mS1wYA61Koum27agcjqFQ_Xszf-00QBKUU0QbGuUe_ifpOl8MBBRCbEHtIZFS_bg9f-CeYXNrFBvAFGCEd2OMr8WGd4z1M2tK3SlmBqgw
2017-06-27 13:27:14,896 [DEBUG] ListFolderAsync result HasMore is false
2017-06-27 13:27:14,911 [DEBUG] GetFolderList CURSOR : AAHA6xuh9msxmApG3USBbTi6tOyaowlz-ZbSuoH3HjFyQ_eymn-YII03nNmuAD0ltM7w9mS1wYA61Koum27agcjqFQ_Xszf-00QBKUU0QbGuUe_ifpOl8MBBRCbEHtIZFS_bg9f-CeYXNrFBvAFGCEd2OMr8WGd4z1M2tK3SlmBqgw
2017-06-27 13:27:46,387 [DEBUG] IsChanged returns false
2017-06-27 13:28:21,830 [DEBUG] IsChanged returns false
2017-06-27 13:29:08,350 [DEBUG] IsChanged returns false
2017-06-27 13:29:57,361 [DEBUG] IsChanged returns false
2017-06-27 13:30:31,179 [DEBUG] IsChanged returns false
2017-06-27 13:31:14,460 [DEBUG] IsChanged returns false
2017-06-27 13:32:01,208 [DEBUG] IsChanged returns false
2017-06-27 13:32:53,843 [DEBUG] IsChanged returns false
2017-06-27 13:33:34,006 [DEBUG] IsChanged returns false
2017-06-27 13:34:30,179 [DEBUG] IsChanged returns false

Greg-DB's avatar
Greg-DB
Icon for Dropbox Community Moderator rankDropbox Community Moderator
9 years ago
Thanks! That's helpful. We're looking into it.
  • 오부경's avatar
    오부경
    Explorer | Level 4
    9 years ago

    I'm sorry for the short English. I used Google Translator

    I have read dropbox documents very deeply again on this issue.

    If I use get_lastest_cursor and longpoll to get changes only, I'm using it wrong.

    I realized I could get a Delta using the "list_folder/continue" call.

    So, I came to understand the relationship between Cursor and Delta in turn.

    I've found that it works well only with a good understanding of the behavior of get_lastest_cursor, longpoll, and list_folder/continue.

    After modifying the code, it works fine now.

    For someone like me, leave the reference code below.

     

    Thanks Greg K.

    void CheckChanges()
{
	string LastCursor = String.Empty;

	// first step : get new cursor and keep
	Task task = Task.Run(async () =>
	{
		ListFolderArg arg = new ListFolderArg("", true, false, true, false);
		var result = await Client.Files.ListFolderGetLatestCursorAsync(arg);
		LastCursor = result.Cursor;
	});
	task.Wait();

	// loop : detect changes and get delta
	while(!EndOfCheck)
	{
		bool doGetDelta = false;
		Task task = Task.Run(async () =>
		{
			try
			{
				var longpoll = await Client.Files.ListFolderLongpollAsync(PathFile.Cursor);

				doGetDelta = longpoll.Changes;
			}
			catch
			{
			}
		});
		task.Wait();

		if(doGetDelta)
		{
			List<MyChangeInfo> changeList = new List<MyChangeInfo>();
			ListFolderContinueArg arg = new ListFolderContinueArg(LastChangeCursor);
			Task task = Task.Run(async () =>
			{
				try
				{
					var continueResult = await Client.Files.ListFolderContinueAsync(arg);
					LastChangeCursor = continueResult.Cursor; // keep cursor
					if (continueResult.Entries != null && continueResult.Entries.Count > 0)
					{
						foreach (var entry in continueResult.Entries)
						{
							MyChangeInfo change = new MyChangeInfo();
							change.key = entry.PathLower;
							change.metadata = entry;
							change.removed = entry.IsDeleted;
							changeList.Add(change);
						}
					}
				}
				catch
				{
				}
			});
			task.Wait();

			if(newList.Count > 0)
			{
				// Do Apply Changes
				foreach(var change in newList)
				{
					if(change.removed)
					{
					// do delete file or folder
					}
					else
					{
					// do update or add
					}
				}
			}
		}
	}
}

     

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