XSF Discussion - 2019-07-16

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  111. madhur.garg hi, I am implementing Infinite scroll using MAM in Poezio for that, I have to query messages in reverse order. I am sending the query like this: https://xmpp.org/extensions/xep-0313.html#example-9 with the timestamp of the current 1st message in the chat as the end timestamp, I have one doubt with this: What value should I take for start timestamp here? (should it be some fixed timestamp like '2010-08-07T00:00:00Z' or taking it relative to end timestamp like 'end timestamp - 360 days')
  112. lovetox_ has joined
  113. lovetox_ nothing
  114. lovetox_ start is not a mandatory field, If omitted, the server SHOULD assume the value of 'start' to be equal to the date/time of the earliest message stored in the archive.
  115. pep. The idea here is not to get the earliest message then
  116. pep. It's to get messages before a what's already in the buffer for the room
  117. lovetox_ you do that via RSM page request
  118. lovetox_ not via mam search limit
  119. pep. It's to get messages before what's already in the buffer for the room
  120. lovetox_ first you decide in what timespan the server should prepare messages
  121. lovetox_ these messages are not sent ! then you decide what page of that request you want
  122. lovetox_ so yes i want everything from first message in my chat to first message ever in the archive to be prepared by the server
  123. lovetox_ then i want the last page of that result
  124. ralphm Then again syncing all of history can be pretty expensive (time, bandwidth, size). What we did at first start is get the last 7 days, and then on individual chats infinite scroll back if the user wanted to go further back.
  125. lovetox_ ralphm, this has nothing to do with syncing full history
  126. lovetox_ only because i tell the server operate within these limits, does not mean i request all the pages until i reach the limit
  127. lovetox_ but yeah one could specify something like (end - 2 weeks ) or something
  128. ralphm Oh, then I misinterpreted what you wrote.
  129. lovetox_ the problem with dates is you dont know how many messages are within a date span
  130. ralphm Yes, definitely
  131. lovetox_ i can request backwars 1 year, and there are 0 messages
  132. lovetox_ so i request backwards until the first message in the archive, then request in 30 page junks
  133. ralphm The date range was for the very first sync, for all of history across contacts.
  134. lovetox_ and abort after 100 messages
  135. ralphm We used size limits (I think 50 or 100) for infinite scroll.
  136. lovetox_ yes ralph, for forwards sync
  137. lovetox_ date range is good
  138. lovetox_ on first start
  139. lovetox_ i do also 7 days i think
  140. ralphm Had some with non-chat messages, which ties into handling of reactions, edits.
  141. ralphm Some issues
  142. lovetox_ everything but mam full sync from a stanza-id forward
  143. lovetox_ is messy
  144. ralphm Things like deliver/read markers, CDRs (for calls).
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  146. lovetox_ thats why i still didnt implement backwards scrolling, just to many issues that can arise from it
  147. lovetox_ and im not sure full sync is so bad
  148. lovetox_ because most servers have a 3 months limit on storage anyway
  149. pep. Tell that to my CPU :p
  150. madhur.garg By default, does it takes the start timestamp of the first message? (I am not sure if that is true, but will check it again) So, what should be good to go with nothing as a start date or with a date range of say 360 days?
  151. lovetox_ i made tests with decent servers, and 3000 messages are downloaded in a matter of seconds
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  153. pep. lovetox_, I store as much as I can on my server tbh, and I won't change that for anything
  154. lovetox_ madhur.garg, set nothing as start, and abort after receiving X pages
  155. pep. lovetox_, we need something as start no? We don't start with an empty buffer
  156. lovetox_ pep. this is no problem means on first start you have to wait 10 seconds, instead of 5
  157. pep. I remember dino downloading a year of private messages each time I'd reset it (testing stuff)
  158. lovetox_ yeah so? if i present you with a loading progress i dont see a problem here
  159. lovetox_ 10.000 messages are probably 10 MB or something 😃
  160. pep. yeah, sure
  161. lovetox_ pep. with backwards scrolling you want to define the end date, not start
  162. lovetox_ you can reverse a mam request
  163. pep. So the end date means "From this date"?
  164. pep. and then backwards
  165. lovetox_ see the mam requst like the DB query the server makes
  166. lovetox_ start = first message of archive, end = whatever is first in your buffer
  167. lovetox_ and start = emtpy, means first message of the archive
  168. lovetox_ at least thats what the XEP mandates
  169. lovetox_ thats only the result set then
  170. lovetox_ after that you set with RSM which page from that result you want
  171. lovetox_ obviously not the first
  172. lovetox_ you want the last page of that db query
  173. lovetox_ see 0059 for how to request the last page of a result set
  174. ralphm I'd never want to use a server that limits how much history is kept.
  175. pep. lovetox_, I want the last page of that query because.. it's in reverse order?
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  179. lovetox_ pep. you cant reverse a query
  180. lovetox_ a query is always from start to end within all the messages of the archive
  181. lovetox_ and in the order first to last message
  182. lovetox_ if your first message in the buffer is number 10
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  184. lovetox_ then you request from the server messages 1-9, then limit that result with RSM so the server gives you the last page of that result
  185. lovetox_ and if your page size=1
  186. lovetox_ this means he sends you number 9
  187. lovetox_ you successfully backscrolled !
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  189. pep. right, ok
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  327. pep. TIL https://xmpp.org/extensions/xep-0142.html
  328. lovetox wtf
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