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https://issues.apache.org/jira/browse/SOLR-7576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14595083#comment-14595083
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David Smiley commented on SOLR-7576:
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I've vaguely heard of the new blob store & signing. I took a look at
https://cwiki.apache.org/confluence/display/solr/Adding+Custom+Plugins+in+SolrCloud+Mode
I get that it's secure but following that would be a real PITA during
development. Is there a faster way to to redeploy a changed file during
development? Maybe a simple script could do that? Or better yet, a mode
during development that would simply pick up the change from the file system.
Oh wait; in a SolrCloud/ZooKeeper world, that may not make sense. Hmmmm :-/
Related to this is the possibility of introducing some sort of
AbstractSolrTestCase thingamagic (or new subclass) to test that a request
employing some specific JavaScript (but defined in the test or as a test
resource) is working. That could lead to a faster dev cycle, and it encourages
testing.
How does one go about logging? (again, not necessarily for real/production but
for development to inspect what the heck some object is or its members).
The examples look nice; I like the use of '$'. It'd be nice to see an example
of taking the response of a query to pull out it's contents.
I understand that JS is a first-class-citizen but if I want to use something
else, like Groovy, is that possible? What remains? Did you look at SOLR-5005?
> Implement RequestHandler in Javascript
> --------------------------------------
>
> Key: SOLR-7576
> URL: https://issues.apache.org/jira/browse/SOLR-7576
> Project: Solr
> Issue Type: New Feature
> Reporter: Noble Paul
> Attachments: SOLR-7576.patch, SOLR-7576.patch
>
>
> Solr now support dynamic loading (SOLR-7073) of components and it is secured
> in SOLR-7126
> We can extend the same functionality with JS as well
> the handler {{/js}} is implicitly registered
> To make this work
> * Solr should be started with {{-Denable.js.loading=true}}
> * The javascript must be loaded to the {{.system}} collection using the blob
> store API
> * Configure the requesthandler with the JS blob name and version
> * Sign the javascript and pass the signature in a param called {{_sig}}
> The {{JSRequestHandler}} is implicitly defined and it can be accessed by
> hitting {{/js/<jsname>/<version>}}
> sample programs
> 1) writes a val to output
> {code:javascript}
> //empty line
> $.response().add('testkey','Test Val');
> {code}
> 2) manipulate the output to add an extra field to each doc
> {code}
> //empty line
> var l = [];
> $.query({
> q: '*:*',
> qt: '/select',
> start:0,
> }).forEach('response', function(doc) {
> doc.put('script', 'Added this
> value');
> l.push(doc);
> });
> $.response().add('alldocs', l);
> {code}
> 3) stream through all the docs
> {code:Javascript}
> $.query({
> q: '*:*',
> qt: '/select',
> start:0,
> distrib:'false'
> }).pipe('response', 'docs', function(doc) { // the pipe function is
> executed right before the response writer and right after the transformers
> if('IT'== doc.get('genre_s')) return
> null;
> doc.put('script', 'Added this
> value');
> return doc;
> });
> {code}
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