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| <h1 class="title">Fuseki HTTP Administration Protocol</h1> |
| |
| |
| <main class="d-flex flex-xl-row flex-column"> |
| |
| <aside class="text-muted align-self-start mb-3 p-0 d-xl-none d-block"> |
| <h2 class="h6 sticky-top m-0 p-2 bg-body-tertiary">On this page</h2> |
| <nav id="TableOfContents"> |
| <ul> |
| <li><a href="#operations">Operations</a></li> |
| <li><a href="#ping">Ping</a></li> |
| <li><a href="#server-information">Server Information</a></li> |
| <li><a href="#datasets-and-services">Datasets and Services</a> |
| <ul> |
| <li><a href="#adding-a-dataset-and-its-services">Adding a Dataset and its Services.</a> |
| <ul> |
| <li><a href="#templates">Templates</a></li> |
| <li><a href="#assembler-example">Assembler example</a></li> |
| </ul> |
| </li> |
| <li><a href="#removing-a-dataset">Removing a Dataset</a></li> |
| <li><a href="#active-and-offline">Active and Offline</a></li> |
| </ul> |
| </li> |
| <li><a href="#statistics">Statistics</a> |
| <ul> |
| <li><a href="#backup">Backup</a></li> |
| <li><a href="#backup-policies">Backup policies</a></li> |
| <li><a href="#compact">Compact</a></li> |
| </ul> |
| </li> |
| <li><a href="#tasks">Tasks</a></li> |
| <li><a href="#metrics">Metrics</a></li> |
| </ul> |
| </nav> |
| </aside> |
| <article class="flex-column me-lg-4"> |
| <p>This page describes the HTTP Protocol used to control an Fuseki server via |
| its administrative interface.</p> |
| <ul> |
| <li><a href="#operations">Operations</a></li> |
| <li><a href="#server-information">Server Information</a></li> |
| <li><a href="#datasets-and-services">Datasets and Services</a> |
| <ul> |
| <li>Adding a Dataset and its Services</li> |
| <li>Removing a Dataset</li> |
| <li>Dormant and Active</li> |
| </ul> |
| </li> |
| <li><a href="#remove-dataset">Removing a dataset</a></li> |
| </ul> |
| <p>All admin operations have URL paths starting <code>/$/</code> to avoid clashes with |
| dataset names and this prefix is reserved for the Fuseki control functions. |
| Further operations may be added within this naming scheme.</p> |
| <h2 id="operations">Operations</h2> |
| <p>Replace <code>{name}</code> with a dataset name: e.g. <code>/$/backup/myDataset</code>.</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Method</th> |
| <th>URL pattern</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td></td> |
| <td></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>GET</tt></td> |
| <td><code>/$/ping</code></td> |
| <td>Check if server is alive</td> |
| </tr> |
| <tr> |
| <td><tt>POST</tt></td> |
| <td><code>/$/ping</code></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>GET</tt></td> |
| <td><code>/$/server</code></td> |
| <td>Get basic information (version, uptime, datasets…)</td> |
| </tr> |
| <tr> |
| <td><tt>POST</tt></td> |
| <td><code>/$/server</code></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>GET</tt></td> |
| <td><code>/$/status</code></td> |
| <td>Alias of <code>/$/server</code></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>POST</tt></td> |
| <td><code>/$/datasets</code></td> |
| <td>Create a new dataset</td> |
| </tr> |
| <tr> |
| <td><tt>GET</tt></td> |
| <td><code>/$/datasets</code></td> |
| <td>Get a list of datasets</td> |
| </tr> |
| <tr> |
| <td><tt>DELETE</tt></td> |
| <td><code>/$/datasets/{name}</code></td> |
| <td>Remove a dataset</td> |
| </tr> |
| <tr> |
| <td><tt>GET</tt></td> |
| <td><code>/$/datasets/{name}</code></td> |
| <td>Get information about a dataset</td> |
| </tr> |
| <tr> |
| <td><tt>POST</tt></td> |
| <td><code>/$/datasets/{name}?state=offline</code></td> |
| <td>Switch state of dataset to offline</td> |
| </tr> |
| <tr> |
| <td><tt>POST</tt></td> |
| <td><code>/$/datasets/{name}?state=active</code></td> |
| <td>Switch state of dataset to online</td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>POST</tt></td> |
| <td><code>/$/server/shutdown</code></td> |
| <td>Not implemented yet</td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>GET</tt></td> |
| <td><code>/$/stats</code></td> |
| <td>Get request statistics for all datasets</td> |
| </tr> |
| <tr> |
| <td><tt>GET</tt></td> |
| <td><code>/$/stats/{name}</code></td> |
| <td>Get request statistics for a dataset</td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>POST</tt></td> |
| <td><code>/$/backup/{name}</code></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>POST</tt></td> |
| <td><code>/$/backups/{name}</code></td> |
| <td>Alias of <code>/$/backup/{name}</code></td> |
| </tr> |
| <tr> |
| <td><tt>GET</tt></td> |
| <td><code>/$/backups-list</code></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>POST</tt></td> |
| <td><code>/$/compact/{name}?deleteOld=true</code></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>POST</tt></td> |
| <td><code>/$/sleep</code></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>GET</tt></td> |
| <td><code>/$/tasks</code></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>GET</tt></td> |
| <td><code>/$/tasks/{name}</code></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>GET</tt></td> |
| <td><code>/$/metrics</code></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td></td> |
| <td></td> |
| <td></td> |
| </tr> |
| <tr> |
| <td><tt>GET</tt></td> |
| <td><code>/$/logs</code></td> |
| <td>Not implemented yet</td> |
| </tr> |
| </tbody> |
| </table> |
| <h2 id="ping">Ping</h2> |
| <p>Pattern: <code>/$/ping</code></p> |
| <p>The URL <code>/$/ping</code> is a guaranteed low cost point to test whether a server |
| is running or not. It returns no other information other than to respond to the |
| request over <code>GET</code> or <code>POST</code> (to avoid any HTTP caching) with a 200 response.</p> |
| <p>Return: current timestamp</p> |
| <h2 id="server-information">Server Information</h2> |
| <p>Pattern: <code>/$/server</code></p> |
| <p>The URL <code>/$/server</code> returns details about the server and it’s current status in JSON.</p> |
| <p><em>@@details of JSON format.</em></p> |
| <h2 id="datasets-and-services">Datasets and Services</h2> |
| <p>Pattern: <code>/$/datasets</code></p> |
| <p><code>/$/datasets</code> is a container representing all datasets present in the server. |
| <code>/$/datasets/{name}</code> names a specific dataset. As a container, operations on items |
| in the container, via <code>GET</code>, <code>POST</code> and <code>DELETE</code>, operate on specific dataset.</p> |
| <h3 id="adding-a-dataset-and-its-services">Adding a Dataset and its Services.</h3> |
| <blockquote> |
| <p><em>@@ May add server-managed templates</em></p> |
| </blockquote> |
| <p>A dataset set can be added to a running server. There are several methods |
| for doing this:</p> |
| <ul> |
| <li>Post the assembler file</li> |
| <li>HTML Form upload the assembler file</li> |
| <li>Use a built-in template (in-memory or persistent)</li> |
| </ul> |
| <p>All require HTTP <code>POST</code>.</p> |
| <p>Changes to the server state are carried across restarts.</p> |
| <p>For persistent datasets, for example <a href="/documentation/tdb">TDB</a>, |
| the dataset is persists across restart.</p> |
| <p>For in-memory datasets, the dataset is rebuilt from it’s description |
| (this may include loading data from a file) but any changes are lost.</p> |
| <h4 id="templates">Templates</h4> |
| <p>A short-cut form for some common set-ups is provided by <tt>POST</tt>ing with |
| the following parameters (query string or HTML form):</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Parameter</th> |
| <th></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td><code>dbType</code></td> |
| <td>Either <code>mem</code> or <code>tdb</code></td> |
| </tr> |
| <tr> |
| <td><code>dbName</code></td> |
| <td>URL path name</td> |
| </tr> |
| </tbody> |
| </table> |
| <p>The dataset name must not be already in-use.</p> |
| <p>Datasets are created in directory <code>databases/</code>.</p> |
| <h4 id="assembler-example">Assembler example</h4> |
| <p>The assembler description contains data and service. It can be sent by posting the assembler RDF graph |
| in any RDF format or by posting from an HTML form (the syntax must be Turtle).</p> |
| <p>The assembler file is stored by the server will be used on restart or when making the dataset active again.</p> |
| <blockquote> |
| <p><em>@@</em></p> |
| </blockquote> |
| <h3 id="removing-a-dataset">Removing a Dataset</h3> |
| <p>Note: <code>DELETE</code> means “gone for ever”. The dataset name and the details of its |
| configuration are completely deleted and can not be recovered.</p> |
| <p>The data of a TDB dataset is not deleted.</p> |
| <h3 id="active-and-offline">Active and Offline</h3> |
| <p>A dataset is in one of two modes: “active”, meaning it is services request over HTTP |
| (subject to configuration and security), or “offline”, meaning the configuration and name |
| is known about by the server but the dataset is not attached to the server. When “offline”, |
| any persistent data can be manipulated outside the server.</p> |
| <p>Datasets are initially “active”. The transition from “active” to “offline” is graceful - all outstanding requests are completed.</p> |
| <h2 id="statistics">Statistics</h2> |
| <p>Pattern: <code>/$/stats/{name}</code></p> |
| <p>Statistics can be obtained for each dataset or all datasets in a single response. |
| <code>/$/stats</code> is treated as a container for this information.</p> |
| <blockquote> |
| <p><em>@@ stats details</em> |
| See <a href="fuseki-server-info.html">Fuseki Server Information</a> for details of statistics kept by a Fuseki server.</p> |
| </blockquote> |
| <h3 id="backup">Backup</h3> |
| <p>Pattern: <code>/$/backup/{name}</code></p> |
| <p>This operation initiates a backup and returns a JSON object with the task Id in it.</p> |
| <p>Backups are written to the server local directory ‘backups’ as gzip-compressed N-Quads files.</p> |
| <p>See <a href="#tasks">Tasks</a> for how to monitor a backups progress.</p> |
| <p>Return: A task is allocated a identifier (usually, a number).</p> |
| <pre tabindex="0"><code>{ "taskId" : "{taskId}" } |
| </code></pre><p>The task id can be used to construct a URL to get details of the task:</p> |
| <pre tabindex="0"><code>/$/tasks/{taskId} |
| </code></pre><p>Pattern: <code>/$/backups-list</code></p> |
| <p>Returns a list of all the files in the backup area of the server. This is |
| useful for managing the files externally.</p> |
| <p>The returned JSON object will have the form <code>{ backups: [ ... ] }</code> where the <code>[]</code> array is |
| a list of file names.</p> |
| <p>Since 4.7.0 backups are written to a temporary file in the same directory and renamed on completion. |
| In case of server crash, it will not be renamed. |
| This guarantees backups are complete. |
| Cleanup of incomplete backups can be done by users on application / container start: remove all incomplete files.g</p> |
| <h3 id="backup-policies">Backup policies</h3> |
| <p>Users can use the backup api <a href="/documentation/fuseki2/fuseki-server-protocol.html#backup">the Fuseki HTTP Administration Protocol</a> to build backup policies. |
| See issue for more information <a href="https://github.com/apache/jena/issues/1500">https://github.com/apache/jena/issues/1500</a> .</p> |
| <h3 id="compact">Compact</h3> |
| <p>Pattern: <code>/$/compact/{name}</code></p> |
| <p>This operations initiates a database compaction task and returns a JSON object with the task Id in it.</p> |
| <p>The optional parameter and value <code>deleteOld=true</code> deletes the database which currently is compacted after compacting completion.</p> |
| <p>Compaction <strong>ONLY</strong> applies to TDB2 datasets, see <a href="../tdb2/tdb2_admin.html#compaction">TDB2 Database Administration</a> |
| for more details of this operation.</p> |
| <p>You can monitor the status of the task via the Tasks portion of the API. A successful compaction will have |
| the <code>finishPoint</code> field set and <code>success</code> field set to <code>true</code>.</p> |
| <h2 id="tasks">Tasks</h2> |
| <p>Some operations cause a background task to be executed, backup is an example. |
| The result of such operations includes a json object with the task id and |
| also a <code>Location:</code> header with the URL of the task created.</p> |
| <p>The progress of the task can be monitored with HTTP GET operations:</p> |
| <p>Pattern: <code>/$/tasks</code> – All asynchronous tasks.<br/> |
| Pattern: <code>/$/tasks/{taskId}</code> – A particular task.</p> |
| <p>The URL <code>/$/tasks</code> returns a description of all running and recently tasks. A finished task can be identified by having a <code>finishPoint</code> and <code>success</code> fields.</p> |
| <p>Each background task has an id. The URL <code>/$/tasks/{taskId}</code> gets a description about one single task.</p> |
| <p>Details of the last few completed tasks are retained, up to a fixed number. The records will eventually be removed as later tasks complete, and the task URL will then return 404.</p> |
| <p>Pattern: <code>/$/tasks</code> ; example:</p> |
| <pre tabindex="0"><code>[ { |
| "finished" : "2014-05-28T12:52:51.860+01:00" , |
| "started" : "2014-05-28T12:52:50.859+01:00" , |
| "task" : "sleep" , |
| "taskId" : "1" , |
| "success" : true |
| } , |
| { |
| "finished" : "2014-05-28T12:53:24.718+01:00" , |
| "started" : "2014-05-28T12:53:14.717+01:00" , |
| "task" : "sleep" , |
| "taskId" : "2" , |
| "success" : true |
| } |
| ] |
| </code></pre><p>Pattern: <code>/$/tasks/1</code> : example:</p> |
| <pre tabindex="0"><code>[ { |
| "finished" : "2014-05-28T13:54:13.608+01:00" , |
| "started" : "2014-05-28T13:54:03.607+01:00" , |
| "task" : "backup" , |
| "taskId" : "1" , |
| "success" : false |
| } |
| ] |
| </code></pre><p>This is inside an array to make the format returned the same as <code>/$/tasks</code>.</p> |
| <h2 id="metrics">Metrics</h2> |
| <p>Pattern: <code>/$/metrics</code></p> |
| <blockquote> |
| <p><em>@@</em></p> |
| </blockquote> |
| |
| </article> |
| |
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| <nav id="TableOfContents"> |
| <ul> |
| <li><a href="#operations">Operations</a></li> |
| <li><a href="#ping">Ping</a></li> |
| <li><a href="#server-information">Server Information</a></li> |
| <li><a href="#datasets-and-services">Datasets and Services</a> |
| <ul> |
| <li><a href="#adding-a-dataset-and-its-services">Adding a Dataset and its Services.</a> |
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| <li><a href="#compact">Compact</a></li> |
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