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199 lines
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<meta property="og:description" content="The provided pts + limit < remote pts. Simply, there are too many updates to be fetched (more than limit), the client has to resolve the update gap in one of the following ways (assuming the existence of a persistent database to locally store messages):">
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<div class="dev_page_bread_crumbs"><ul class="breadcrumb clearfix"><li><a href="/api" >API</a></li><i class="icon icon-breadcrumb-divider"></i><li><a href="/schema" >TL-schema</a></li><i class="icon icon-breadcrumb-divider"></i><li><a href="/constructor/updates.channelDifferenceTooLong" >updates.channelDifferenceTooLong</a></li></ul></div>
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<h1 id="dev_page_title">updates.channelDifferenceTooLong</h1>
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<div id="dev_page_content"><p>The provided <code>pts + limit < remote pts</code>. Simply, there are too many updates to be fetched (more than <code>limit</code>), the client has to resolve the update gap in one of the following ways (assuming the existence of a persistent database to locally store messages):</p>
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<ol>
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<li>Delete all known messages in the chat, begin from scratch by refetching all messages manually with <a href="/method/messages.getHistory">messages.getHistory</a>. It is easy to implement, but suddenly disappearing messages look awful to the user.</li>
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<li>Save all messages loaded in the memory until application restart, but delete all messages from the database. Messages left in the memory must be lazily updated using calls to <a href="/method/messages.getHistory">messages.getHistory</a>.<br>
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It will look much smoother to the user, they will need to redownload messages only after client restart.<br>
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Unsynchronized messages left in memory shouldn't be saved to the database, results of <a href="/method/messages.getHistory">messages.getHistory</a> and <a href="/method/messages.getMessages">messages.getMessages</a> must be used to update the state of deleted and edited messages left in the memory.</li>
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<li>Save all messages loaded in the memory and stored in the database without saving that some messages form continuous ranges.<br>
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Messages in the database will be excluded when paginating through or searching the local message history after application restart and will be available only through individual message queries.<br>
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Every message should still be checked using <a href="/method/messages.getHistory">messages.getHistory</a>.<br>
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It has more disadvantages over 2) than advantages.</li>
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<li>Save all messages with saving all data about continuous message ranges.<br>
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Messages from the database may be used when paginating through or searching the local message history.<br>
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The messages should still be lazily checked using <a href="/method/messages.getHistory">messages.getHistory</a>, but they are still available offline.<br>
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It is the best way for gaps support, but it is pretty hard to implement correctly.</li>
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</ol>
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<p>It should be also noted that some messages like live location messages shouldn't be deleted.</p>
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<a class="dropdown-toggle" onclick="return dropdownClick(this, event)" href="#">Layer 139 <b class="caret"></b></a>
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<li><a href="?layer=1">1 – Base layer</a></li><li><a href="?layer=2">2 – New userpic notifications</a></li><li><a href="?layer=3">3 – Send message can trigger link change</a></li><li><a href="?layer=4">4 – Check-in chats</a></li><li><a href="?layer=5">5 – Localized SMS, localized notifications</a></li><li><a href="?layer=6">6 – Foursquare integration</a></li><li><a href="?layer=7">7 – Added wallPaperSolid</a></li><li><a href="?layer=8">8 – Added end-to-end encryption</a></li><li><a href="?layer=9">9 – Improved big files upload perfomance</a></li><li><a href="?layer=10">10 – Improved chat participants updates</a></li><li><a href="?layer=11">11 – Improved secret chats</a></li><li><a href="?layer=12">12 – New dynamic support</a></li><li><a href="?layer=13">13 – Audio, video MIME; contacts import retry; new secret actions</a></li><li><a href="?layer=14">14 – Notify settings sync, blacklist sync</a></li><li><a href="?layer=15">15 – Modified getHistory offset behaviour</a></li><li><a href="?layer=16">16 – Split sendCode into 2 parts</a></li><li><a href="?layer=17">17 – Added custom typing, introduced message flags</a></li><li><a href="?layer=18">18 – Added usernames</a></li><li><a href="?layer=23">23 – Stickers for secret chats</a></li><li><a href="?layer=105">105 – Scheduled messages, Cloud themes</a></li><li><a href="?layer=108">108 – Login with QR code</a></li><li><a href="?layer=109">109 – Polls v2</a></li><li><a href="?layer=110">110 – People Nearby 2.0, Bank card entity</a></li><li><a href="?layer=111">111 – Folders, Broadcast Stats</a></li><li><a href="?layer=112">112 – Old featured stickers, generic dice, poll timer, poll solution</a></li><li><a href="?layer=113">113 – PSA</a></li><li><a href="?layer=114">114 – Video thumbs for GIFs</a></li><li><a href="?layer=115">115 – Peek Channel Invite</a></li><li><a href="?layer=116">116 – Group Stats, Profile Videos</a></li><li><a href="?layer=117">117 – WebRTC Phone Calls</a></li><li><a href="?layer=118">118 – Callback with 2FA, Countries list</a></li><li><a href="?layer=119">119 – Comments in channels, Threads, Anonymous Admins</a></li><li><a href="?layer=120">120 – Multipins, Message Stats, GeoLive v2</a></li><li><a href="?layer=121">121 – SVG-based Outlines for Stickers</a></li><li><a href="?layer=122">122 – Voice Chats</a></li><li><a href="?layer=123">123 – Voice Chat improvements</a></li><li><a href="?layer=124">124 – Expiring Invite links</a></li><li><a href="?layer=125">125 – Voice Chats in Broadcasts</a></li><li><a href="?layer=126">126 – Ban channels in channels</a></li><li><a href="?layer=127">127 – Payments in channels</a></li><li><a href="?layer=128">128 – Microthumbs for User/Chat profile photos</a></li><li><a href="?layer=129">129 – Video Chats</a></li><li><a href="?layer=130">130 – Custom placeholder for bot reply keyboards</a></li><li><a href="?layer=131">131 – Reset 2FA Password after a week</a></li><li><a href="?layer=132">132 – Chat themes</a></li><li><a href="?layer=133">133 – 64-bit IDs for User/Chat</a></li><li><a href="?layer=134">134 – Chat Requests, Shared Media Calendar</a></li><li><a href="?layer=135">135 – Send Message As a Channel</a></li><li><a href="?layer=136">136 – Reactions</a></li><li><a href="?layer=137">137 – Translations</a></li><li><a href="?layer=138">138 – GIF Sticker Packs</a></li><li><a href="?layer=139"><strong>139 – RTMP streaming</strong></a></li>
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<li><a href="/api/layers">More...</a></li>
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<pre class="page_scheme"><code><a href="/constructor/updates.channelDifferenceTooLong" class="current_page_link" >updates.channelDifferenceTooLong</a>#a4bcc6fe flags:<a href="/type/%23" >#</a> final:flags.0?true timeout:flags.1?<a href="/type/int" >int</a> dialog:<a href="/type/Dialog" >Dialog</a> messages:<a href="/type/Vector%20t" >Vector</a><<a href="/type/Message" >Message</a>> chats:<a href="/type/Vector%20t" >Vector</a><<a href="/type/Chat" >Chat</a>> users:<a href="/type/Vector%20t" >Vector</a><<a href="/type/User" >User</a>> = <a href="/type/updates.ChannelDifference" >updates.ChannelDifference</a>;</code></pre></p>
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<h3><a class="anchor" href="#parameters" id="parameters" name="parameters"><i class="anchor-icon"></i></a>Parameters</h3>
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<table class="table">
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<thead>
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<tr>
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<th>Name</th>
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<th style="text-align: center;">Type</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><strong>flags</strong></td>
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<td style="text-align: center;"><a href="/type/%23">#</a></td>
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<td>Flags, see <a href="/mtproto/TL-combinators#conditional-fields">TL conditional fields</a></td>
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</tr>
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<tr>
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<td><strong>final</strong></td>
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<td style="text-align: center;"><a href="/mtproto/TL-combinators#conditional-fields">flags</a>.0?<a href="/constructor/true">true</a></td>
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<td>Whether there are more updates that must be fetched (always false)</td>
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</tr>
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<tr>
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<td><strong>timeout</strong></td>
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<td style="text-align: center;"><a href="/mtproto/TL-combinators#conditional-fields">flags</a>.1?<a href="/type/int">int</a></td>
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<td>Clients are supposed to refetch the channel difference after timeout seconds have elapsed</td>
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</tr>
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<tr>
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<td><strong>dialog</strong></td>
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<td style="text-align: center;"><a href="/type/Dialog">Dialog</a></td>
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<td>Dialog containing the latest <a href="/api/updates">PTS</a> that can be used to reset the channel state</td>
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</tr>
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<tr>
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<td><strong>messages</strong></td>
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<td style="text-align: center;"><a href="/type/Vector%20t">Vector</a><<a href="/type/Message">Message</a>></td>
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<td>The latest messages</td>
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</tr>
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<tr>
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<td><strong>chats</strong></td>
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<td style="text-align: center;"><a href="/type/Vector%20t">Vector</a><<a href="/type/Chat">Chat</a>></td>
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<td>Chats from messages</td>
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</tr>
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<tr>
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<td><strong>users</strong></td>
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<td style="text-align: center;"><a href="/type/Vector%20t">Vector</a><<a href="/type/User">User</a>></td>
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<td>Users from messages</td>
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</tr>
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</tbody>
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</table>
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<h3><a class="anchor" href="#type" id="type" name="type"><i class="anchor-icon"></i></a>Type</h3>
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<p><a href="/type/updates.ChannelDifference">updates.ChannelDifference</a></p>
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<h3><a class="anchor" href="#related-pages" id="related-pages" name="related-pages"><i class="anchor-icon"></i></a>Related pages</h3>
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<h4><a class="anchor" href="#working-with-updates" id="working-with-updates" name="working-with-updates"><i class="anchor-icon"></i></a><a href="/api/updates">Working with Updates</a></h4>
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<p>How to subscribe to updates and handle them properly.</p>
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<h4><a class="anchor" href="#messagesgethistory" id="messagesgethistory" name="messagesgethistory"><i class="anchor-icon"></i></a><a href="/method/messages.getHistory">messages.getHistory</a></h4>
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<p>Gets back the conversation history with one interlocutor / within a chat</p>
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<h4><a class="anchor" href="#messagesgetmessages" id="messagesgetmessages" name="messagesgetmessages"><i class="anchor-icon"></i></a><a href="/method/messages.getMessages">messages.getMessages</a></h4>
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<p>Returns the list of messages by their IDs.</p></div>
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