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|
+++
title = "strusWebService"
+++
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section>
<h1>Strus - Web Service</h1>
<p>
<small>Created by <a href="http://www.andreasbaumann.cc">Andreas Baumann</a></small>
</p>
<p>
<small><a href="http://www.andreasbaumann.cc/slide/strus-webservice">http://www.andreasbaumann.cc/slide/strus-webservice</a></small>
</p>
<p><small>(C)2015/2016</small></p>
</section>
<section>
<h2>Outline</h2>
<ul>
<li>Have a web service, language independent, for search.</li>
<li>The software to the vision exists, it's called <b>Elasticsearch.</b></li>
<li>Based on Lucene, so we do the same with Strus</li>
<li>Currently there is a Java API which uses this service</li>
</ul>
</section>
<section>
<h2>Strus web service</h2>
<ul>
<li>uses JSON and HTTP GET/POST</li>
<li>implemented using <a href="http://cppcms.com/wikipp/en/page/main">CppCMS</a></li>
<li>uses only the <a href="http://patrickfrey.github.io/strus/doc/doxygen/html/index.html">Strus core API</a> currently</li>
</ul>
</section>
<section>
<h2>Design rationales</h2>
<ul>
<li>standard technology (HTTP, JSON)</li>
<li>CRUD (all basic functions exists for all classes)</lib>
<li>proxyable and securable</li>
<li>zero-configuration</li>
<li>scalable</li>
<li>C++</li>
<li>MPL v2</li>
<li>runs on Linux, OSX, FreeBSD</li>
</ul>
</section>
<section>
<h2>Protocol</h2>
<ul>
<li>Service functions</li>
<li>Index functions</li>
<li>Document functions</li>
<li>Query functions</li>
<li>Transactions</li>
<li>Statistics</li>
<li>Introspection and Configuration</li>
</ul>
</section>
<section>
<h2>Protocol</h2>
<ul>
<li>Manipulate indexes:
<pre><code class="hljs" data-trim contenteditable>
curl -XPOST -H 'Content-Type: application/json'
http://localhost:8080/strus/index/create/A
'-d { "params" : { } }'
{"result":"ok"}
curl -XPOST http://localhost:8080/strus/index/delete/A
{"result":"ok"}
curl -XPOST http://localhost:8080/strus/index/exists/A
{"exists":false,"result":"ok"}
</code></pre>
</li>
</ul>
</section>
<section>
<h2>Protocol</h2>
<ul>
<li>Insert document:
<pre><code class="hljs" data-trim contenteditable>
curl -XPOST -H 'Content-Type: application/json'
http://localhost:8080/strus/document/insert/A
-d
{ "doc" : { "docid" : "doc3",
"attributes" : [
{ "key" : "title", "value" : "This is a Hello World Document" },
{ "key" : "attr1", "value" : "val1" },
{ "key" : "attr2", "value" : "val2" } ],
"metadata" : [
{ "key" : "doclen", "value" : 23773 }, { "key" : "docweight", "value" : 3.1415 } ],
"forward" : [
{ "type" : "word", "value" : "Hello", "pos": 1 },
{ "type" : "word", "value" : "World", "pos" : 2 } ],
"search" : [
{ "type" : "Word", "value" : "hello", "pos": 1 },
{ "type" : "word", "value" : "world", "pos" : 2 } ] }
}
</code></pre>
</li>
</ul>
</section>
<section>
<h2>Protocol</h2>
<ul>
<li>Query:
<pre><code class="hljs" data-trim contenteditable>
curl -XPOST -H 'Content-Type: application/json'
http://localhost:8080/strus/query/A
-d
{ "query": {
"first_rank": 0,
"nof_ranks": 20,
"weighting": {
"scheme": {
"name": "bm25",
"params": [
{
"key": "b",
"value": 0.75
},
{
"key": "k1",
"value": 1.0001
},
{
"key": "avgdoclen",
"value": 11943
}
]
}
},
"summarizer": [
{
"attribute": "attribute",
"name": "attribute",
"params": [
{
"key": "name",
"value": "docid"
}
]
}
],
"features": [
{
"name": "feat",
"value": {
"term": {
"type": "word",
"value": "hello"
}
},
"weight": 1
},
{
"name": "sel",
"value": {
"expression": {
"operator": "union",
"range": 0,
"cardinality": 0,
"terms": [
{
"term": {
"type": "word",
"value": "hello"
}
}
]
}
},
"weight": 1
}
],
"select": [
"sel"
]
}
{
"execution_time": 0.000983791,
"ranklist": {
"documents_ranked": 1,
"documents_visited": 1,
"passes_evaluated": 0,
"ranks": [
{
"attributes": [
{
"key": "docid",
"value": "doc3"
}
],
"docno": 1,
"weight": 0
}
]
},
"result": "ok"
}
</code></pre>
</li>
</ul>
</section>
<section>
<h2>Protocol</h2>
<ul>
<li>Transactions:
<pre><code class="hljs" data-trim contenteditable>
curl -XPOST -H 'Content-Type: application/json'
http://localhost:8080/strus/transaction/begin/A/T1
curl -XPOST -H 'Content-Type: application/json'
http://localhost:8080/strus/document/insert/A
-d
{ "transaction" : { "id" : "T1" },
"doc" : { "docid" : "doc1",
...
}
curl -XPOST -H 'Content-Type: application/json'
http://localhost:8080/strus/transaction/commit/A/T1
</code></pre>
</li>
</ul>
</section>
<section>
<h2>Protocol</h2>
<ul>
<li>Introspection (document):
<pre><code class="hljs" data-trim contenteditable>
curl -XPOST -H 'Content-Type: application/json'
http://localhost:8080/strus/document/get/A/doc3
{
"doc": {
"attributes": [
{
"key": "attr1",
"value": "val1"
},
{
"key": "attr2",
"value": "val2"
},
{
"key": "docid",
"value": "doc3"
},
{
"key": "title",
"value": "This is a Hello World Document"
}
],
"docno": 1,
"forward": [
{
"pos": 1,
"type": "word",
"value": "Hello"
},
{
"pos": 2,
"type": "word",
"value": "World"
}
],
"metadata": [
{
"key": "docweight",
"value": 3.141499996185303
},
{
"key": "doclen",
"value": 23773
},
{
"key": "date",
"value": 0
}
],
"search": [
{
"pos": 1,
"type": "word",
"value": "hello"
},
{
"pos": 2,
"type": "word",
"value": "world"
}
]
},
"execution_time": 0.00028157,
"result": "ok"
}
</code></pre>
</li>
</ul>
</section>
<section>
<h2>Protocol</h2>
<ul>
<li>Statistics and introspection (index):
<pre><code class="hljs" data-trim contenteditable>
curl http://localhost:8080/strus/index/stats/A
{"result":"ok","stats":{"nof_docs":1}}
curl http://localhost:8080/strus/index/config/A
{"config":{
"attributes":["attr1","attr2","docid","title"],
"metadata":[{"name":"date","type":"UInt16"},{"name":"doclen","type":"UInt16"},{"name":"docweight","type":"Float32"}],
"types":["word"]},
"result":"ok"}
</code></pre>
</li>
</ul>
</section>
<section>
<h2>Protocol</h2>
<ul>
<li>Statistics and introspection (system):
<pre><code class="hljs" data-trim contenteditable>
curl http://localhost:8080/strus/config
{"config":{
"posting_join_operators":[
"chain","chain_struct","contains","diff","inrange","inrange_struct","intersect","pred","sequence","sequence_struct","succ","union","within","within_struct"],
"summarizer_functions":[
"accuvariable","attribute","matchphrase","matchpos","matchvariables","metadata"],
"weighting_funtions":[
"bm25","formula","metadata","td","tf"]},
"result":"ok"}
...
"weighting_functions": [
{
"description": "Calculate the document weight with the weighting scheme \"BM25\"",
"name": "bm25",
"parameter": [
{
"description": "defines the query features to weight",
"name": "match",
"type": "feature"
},
{
"description": "parameter of the BM25 weighting scheme",
"name": "k1",
"type": "numeric"
},
...
</code></pre>
</li>
</ul>
</section>
<section>
<h2>Strus web service</h2>
<h3>Links</h3>
<ul>
<li><a href="http://github.com/patrickfrey/strusWebService">http://github.com/patrickfrey/strusWebService</a></li>
</ul>
</section>
<section>
<h2>Java API</h2>
<ul>
<li>Uses latest Java 1.8 (aka requires Java 1.8)</li>
<li>Uses Jackson for POJO serialization from/to JSON</li>
<li>uses javax.ws.rs.client web service classes for HTTP</li>
</ul>
</section>
<section>
<h2>Java API</h2>
<p><b>Note:</b> dead, no longer maintained or developed!!</p>
<h3>Links</h3>
<ul>
<li><a href="http://github.com/Eurospider/strusJavaAPI">http://github.com/Eurospider/strusJavaAPI</a></li>
<li><a href="http://eurospider.github.io/strusJavaApi/apidocs/index.html">JavaDoc</a></li>
</ul>
</section>
<section>
<h2>Todos and future</h2>
<ul>
<li>support all functions from all strus APIs, not only small part of query and storage interface</li>
<li>reimplementation (C++11, alternatives to cppcms?, HTTP/2.0 support? using new strusBindings)</li>
</ul>
</section>
</div>
</div>
|
