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<h1 id="notification-server-overview">Notification Server Overview<a class="headerlink" href="#notification-server-overview" title="Permanent link">&para;</a></h1>
<p>Currently, the status updates of files and libraries on the client and web interface are based on polling the server. The latest status cannot be reflected in real time on the client due to polling delays. The client needs to periodically refresh the library modification, file locking, subdirectory permissions and other information, which causes additional performance overhead to the server.</p>
<p>When a directory is opened on the web interface, the lock status of the file cannot be updated in real time, and the page needs to be refreshed.</p>
<p>The notification server uses websocket protocol and maintains a two-way communication connection with the client or the web interface. When the above changes occur, seaf-server will notify the notification server of the changes. Then the notification server can notify the client or the web interface in real time. This not only improves the real-time performance, but also reduces the performance overhead of the server.</p>
<p>Note, the notification server cannot work if you config Seafile server with SQLite database.</p>
<h2 id="supported-update-reminder-types">Supported update reminder types<a class="headerlink" href="#supported-update-reminder-types" title="Permanent link">&para;</a></h2>
<ol>
<li>The library has been updated.</li>
<li>File lock status changes under the library.</li>
<li>Directory permission changes under the library.</li>
</ol>
<h2 id="how-to-configure-and-run">How to configure and run<a class="headerlink" href="#how-to-configure-and-run" title="Permanent link">&para;</a></h2>
<p>Since seafile-10.0.0, you can configure a notification server to send real-time notifications to clients. In order to run the notification server, you need to add the following configurations under seafile.conf：</p>
<div class="codehilite"><pre><span></span><code><span class="cp"># jwt_private_key are required.You should generate it manually.</span>
<span class="p">[</span><span class="n">notification</span><span class="p">]</span>
<span class="n">enabled</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="nb">true</span>
<span class="cp"># the ip of notification server. (Do not modify the host when using Nginx or Apache, as Nginx or Apache will proxy the requests to this address)</span>
<span class="n">host</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mf">127.0.0.1</span>
<span class="cp"># the port of notification server</span>
<span class="n">port</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">8083</span>
<span class="cp"># the log level of notification server</span>
<span class="cp"># You can set log_level to debug to print messages sent to clients.</span>
<span class="n">log_level</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">info</span>
<span class="cp"># jwt_private_key is used to generate jwt token and authenticate seafile server</span>
<span class="n">jwt_private_key</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">M</span><span class="p">@</span><span class="n">O8VWUb81YvmtWLHGB2I_V7di5</span><span class="o">-</span><span class="mi">@0</span><span class="n">p</span><span class="p">(</span><span class="n">MF</span><span class="o">*</span><span class="n">GrE</span><span class="o">!</span><span class="n">sIws23F</span>
</code></pre></div>
<p>You can generate jwt_private_key with the following command：</p>
<div class="codehilite"><pre><span></span><code><span class="gh">#</span> generate jwt_private_key
openssl rand -base64 32
</code></pre></div>
<p>We generally recommend deploying notification server behind nginx, the notification server can be supported by adding the following nginx configuration:</p>
<div class="codehilite"><pre><span></span><code><span class="n">map</span><span class="w"> </span><span class="o">$</span><span class="n">http_upgrade</span><span class="w"> </span><span class="o">$</span><span class="n">connection_upgrade</span><span class="w"> </span><span class="p">{</span>
<span class="n">default</span><span class="w"> </span><span class="n">upgrade</span><span class="p">;</span>
<span class="s1">&#39;&#39;</span><span class="w"> </span><span class="n">close</span><span class="p">;</span>
<span class="p">}</span>
<span class="n">server</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">location</span><span class="w"> </span><span class="o">/</span><span class="n">notification</span><span class="o">/</span><span class="n">ping</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">proxy_pass</span><span class="w"> </span><span class="n">http</span><span class="p">:</span><span class="o">//</span><span class="mf">127.0</span><span class="o">.</span><span class="mf">0.1</span><span class="p">:</span><span class="mi">8083</span><span class="o">/</span><span class="n">ping</span><span class="p">;</span>
<span class="w"> </span><span class="n">access_log</span><span class="w"> </span><span class="o">/</span><span class="k">var</span><span class="o">/</span><span class="nb">log</span><span class="o">/</span><span class="n">nginx</span><span class="o">/</span><span class="n">notif</span><span class="o">.</span><span class="n">access</span><span class="o">.</span><span class="n">log</span><span class="p">;</span>
<span class="w"> </span><span class="n">error_log</span><span class="w"> </span><span class="o">/</span><span class="k">var</span><span class="o">/</span><span class="nb">log</span><span class="o">/</span><span class="n">nginx</span><span class="o">/</span><span class="n">notif</span><span class="o">.</span><span class="n">error</span><span class="o">.</span><span class="n">log</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="w"> </span><span class="n">location</span><span class="w"> </span><span class="o">/</span><span class="n">notification</span><span class="w"> </span><span class="p">{</span>
<span class="w"> </span><span class="n">proxy_pass</span><span class="w"> </span><span class="n">http</span><span class="p">:</span><span class="o">//</span><span class="mf">127.0</span><span class="o">.</span><span class="mf">0.1</span><span class="p">:</span><span class="mi">8083</span><span class="o">/</span><span class="p">;</span>
<span class="w"> </span><span class="n">proxy_http_version</span><span class="w"> </span><span class="mf">1.1</span><span class="p">;</span>
<span class="w"> </span><span class="n">proxy_set_header</span><span class="w"> </span><span class="n">Upgrade</span><span class="w"> </span><span class="o">$</span><span class="n">http_upgrade</span><span class="p">;</span>
<span class="w"> </span><span class="n">proxy_set_header</span><span class="w"> </span><span class="n">Connection</span><span class="w"> </span><span class="o">$</span><span class="n">connection_upgrade</span><span class="p">;</span>
<span class="w"> </span><span class="n">access_log</span><span class="w"> </span><span class="o">/</span><span class="k">var</span><span class="o">/</span><span class="nb">log</span><span class="o">/</span><span class="n">nginx</span><span class="o">/</span><span class="n">notif</span><span class="o">.</span><span class="n">access</span><span class="o">.</span><span class="n">log</span><span class="p">;</span>
<span class="w"> </span><span class="n">error_log</span><span class="w"> </span><span class="o">/</span><span class="k">var</span><span class="o">/</span><span class="nb">log</span><span class="o">/</span><span class="n">nginx</span><span class="o">/</span><span class="n">notif</span><span class="o">.</span><span class="n">error</span><span class="o">.</span><span class="n">log</span><span class="p">;</span>
<span class="w"> </span><span class="p">}</span>
<span class="p">}</span>
</code></pre></div>
<p>Or add the configuration for Apache:</p>
<div class="codehilite"><pre><span></span><code> ProxyPass /notification/ping http://127.0.0.1:8083/ping/
ProxyPassReverse /notification/ping http://127.0.0.1:8083/ping/
ProxyPass /notification ws://127.0.0.1:8083/
ProxyPassReverse /notification ws://127.0.0.1:8083/
</code></pre></div>
<p>NOTE: according to <a href="https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#proxypass">apache ProxyPass document</a></p>
<div class="codehilite"><pre><span></span><code><span class="nv">The</span><span class="w"> </span><span class="nv">configured</span><span class="w"> </span><span class="nv">ProxyPass</span><span class="w"> </span><span class="nv">and</span><span class="w"> </span><span class="nv">ProxyPassMatch</span><span class="w"> </span><span class="nv">rules</span><span class="w"> </span><span class="nv">are</span><span class="w"> </span><span class="nv">checked</span><span class="w"> </span><span class="nv">in</span><span class="w"> </span><span class="nv">the</span><span class="w"> </span><span class="nv">order</span><span class="w"> </span><span class="nv">of</span><span class="w"> </span><span class="nv">configuration</span>.<span class="w"> </span><span class="nv">The</span><span class="w"> </span><span class="nv">first</span><span class="w"> </span><span class="nv">rule</span><span class="w"> </span><span class="nv">that</span><span class="w"> </span><span class="nv">matches</span><span class="w"> </span><span class="nv">wins</span>.
<span class="nv">So</span><span class="w"> </span><span class="nv">usually</span><span class="w"> </span><span class="nv">you</span><span class="w"> </span><span class="nv">should</span><span class="w"> </span><span class="nv">sort</span><span class="w"> </span><span class="nv">conflicting</span><span class="w"> </span><span class="nv">ProxyPass</span><span class="w"> </span><span class="nv">rules</span><span class="w"> </span><span class="nv">starting</span><span class="w"> </span><span class="nv">with</span><span class="w"> </span><span class="nv">the</span><span class="w"> </span><span class="nv">longest</span><span class="w"> </span><span class="nv">URLs</span><span class="w"> </span><span class="nv">first</span>.
<span class="nv">Otherwise</span>,<span class="w"> </span><span class="nv">later</span><span class="w"> </span><span class="nv">rules</span><span class="w"> </span><span class="k">for</span><span class="w"> </span><span class="nv">longer</span><span class="w"> </span><span class="nv">URLS</span><span class="w"> </span><span class="nv">will</span><span class="w"> </span><span class="nv">be</span><span class="w"> </span><span class="nv">hidden</span><span class="w"> </span><span class="nv">by</span><span class="w"> </span><span class="nv">any</span><span class="w"> </span><span class="nv">earlier</span><span class="w"> </span><span class="nv">rule</span><span class="w"> </span><span class="nv">which</span><span class="w"> </span><span class="nv">uses</span><span class="w"> </span><span class="nv">a</span><span class="w"> </span><span class="nv">leading</span><span class="w"> </span><span class="nv">substring</span><span class="w"> </span><span class="nv">of</span><span class="w"> </span><span class="nv">the</span><span class="w"> </span><span class="nv">URL</span>.<span class="w"> </span><span class="nv">Note</span><span class="w"> </span><span class="nv">that</span><span class="w"> </span><span class="nv">there</span><span class="w"> </span><span class="nv">is</span><span class="w"> </span><span class="nv">some</span><span class="w"> </span><span class="nv">relation</span><span class="w"> </span><span class="nv">with</span><span class="w"> </span><span class="nv">worker</span><span class="w"> </span><span class="nv">sharing</span>.
</code></pre></div>
<p>the final configuration for Apache should be like:</p>
<div class="codehilite"><pre><span></span><code> #
# notification server
#
ProxyPass /notification/ping http://127.0.0.1:8083/ping/
ProxyPassReverse /notification/ping http://127.0.0.1:8083/ping/
ProxyPass /notification ws://127.0.0.1:8083/
ProxyPassReverse /notification ws://127.0.0.1:8083/
#
# seafile fileserver
#
ProxyPass /seafhttp http://127.0.0.1:8082
ProxyPassReverse /seafhttp http://127.0.0.1:8082
RewriteRule ^/seafhttp - [QSA,L]
#
# seahub
#
SetEnvIf Authorization &quot;(.*)&quot; HTTP_AUTHORIZATION=$1
ProxyPreserveHost On
ProxyPass / http://127.0.0.1:8000/
ProxyPassReverse / http://127.0.0.1:8000/
</code></pre></div>
<p>After that, you can run notification server with the following command:</p>
<div class="codehilite"><pre><span></span><code>./seafile.sh restart
</code></pre></div>
<h2 id="checking-notification-server-status">Checking notification server status<a class="headerlink" href="#checking-notification-server-status" title="Permanent link">&para;</a></h2>
<p>When the notification server is working, you can access <code>http://127.0.0.1:8083/ping</code> from your browser, which will answer <code>{"ret": "pong"}</code>. If you have a proxy configured, you can access <code>https://{server}/notification/ping</code> from your browser instead.</p>
<h2 id="compatible-client">Compatible client<a class="headerlink" href="#compatible-client" title="Permanent link">&para;</a></h2>
<ol>
<li>Seadrive 3.0.1 or later.</li>
<li>Seafile client 8.0.11 or later.</li>
</ol>
<p>If the client works with notification server, there should be a log message in seafile.log or seadrive.log.</p>
<div class="codehilite"><pre><span></span><code>Notification server is enabled on the remote server xxxx
</code></pre></div>
<h2 id="notification-server-in-seafile-cluster">Notification Server in Seafile cluster<a class="headerlink" href="#notification-server-in-seafile-cluster" title="Permanent link">&para;</a></h2>
<p>There is no additional features for notification server in the Pro Edition. It works the same as in community edition.</p>
<p>If you enable <a href="../../deploy_pro/deploy_in_a_cluster/">clustering</a>, You need to deploy notification server on one of the servers, or a separate server. The load balancer should forward websockets requests to this node.</p>
<p>On each Seafile frontend node, the notification server configuration should be the same as in community edition:</p>
<div class="codehilite"><pre><span></span><code><span class="k">[notification]</span>
<span class="na">enabled</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">true</span>
<span class="c1"># the ip of notification server.</span>
<span class="na">host</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">192.168.1.134</span>
<span class="c1"># the port of notification server</span>
<span class="na">port</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">8083</span>
<span class="c1"># the log level of notification server</span>
<span class="na">log_level</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">info</span>
<span class="c1"># jwt_private_key is used to generate jwt token and authenticate seafile server</span>
<span class="na">jwt_private_key</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="s">M@O8VWUb81YvmtWLHGB2I_V7di5-@0p(MF*GrE!sIws23F</span>
</code></pre></div>
<p>You need to configure load balancer according to the following forwarding rules:</p>
<ol>
<li>Forward <code>/notification/ping</code> requests to notification server via http protocol.</li>
<li>Forward websockets requests with URL prefix <code>/notification</code> to notification server.</li>
</ol>
<p>Here is a configuration that uses haproxy to support notification server. Haproxy version needs to be &gt;= 2.0.
You should use similar configurations for other load balancers.</p>
<div class="codehilite"><pre><span></span><code><span class="gh">#</span>/etc/haproxy/haproxy.cfg
<span class="gh">#</span> Other existing haproxy configurations
......
frontend seafile
bind 0.0.0.0:80
mode http
option httplog
option dontlognull
option forwardfor
acl notif_ping_request url_sub -i /notification/ping
acl ws_requests url -i /notification
acl hdr_connection_upgrade hdr(Connection) -i upgrade
acl hdr_upgrade_websocket hdr(Upgrade) -i websocket
use_backend ws_backend if hdr_connection_upgrade hdr_upgrade_websocket
use_backend notif_ping_backend if notif_ping_request
use_backend ws_backend if ws_requests
default_backend backup_nodes
backend backup_nodes
cookie SERVERID insert indirect nocache
server seafileserver01 192.168.0.137:80
backend notif_ping_backend
option forwardfor
server ws 192.168.0.137:8083
backend ws_backend
option forwardfor # This sets X-Forwarded-For
server ws 192.168.0.137:8083
</code></pre></div>
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