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https://issues.apache.org/jira/browse/SOLR-7576?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14660489#comment-14660489
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Upayavira commented on SOLR-7576:
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I dislike the idea that we are going to split ourselves in half - JS for an
update processor can just be edited in place, or can be pushed to ZK via zkcli,
whereas now, request handler JS must use an entirely different mechanism.
That's making Solr much harder to comprehend and understand.
I understand how Solr is moving more into enterprises, but don't see how
repeating a pattern we have been using for years is making things considerably
worse - that's what I'd like to understand.
For sure, offer the more secure, enterprise friendly version, but is there a
valid reason *not* to support the method we are already using e.g. for update
processors?
> 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
> * 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>}}
> Steps for developing scripts
> # start the cluster with the {{enable.js.loading}} . If you are starting
> using our script it would be {{bin/solr start -e cloud -a
> "-Denable.js.loading=true"}} . You would not need security during development
> , so don't add the private keys to Solr
> # create {{.system}} collection {{bin/solr create -c .system}}
> # Write your javascript code . (say {{test.js}} )
> # post it to {{.system}} collection . {{curl -X POST -H 'Content-Type:
> application/octet-stream' --data-binary @test.js
> http://localhost:8983/solr/.system/blob/test}}
> # run your script {{http://host:8983/solr/gettingstarted/js/test/1}}
> # Edit your script and repeat from step #4 . Keep in mind that the version
> would be bumped up every time you post a new script . So, the second time the
> url would be {{http://host:8983/solr/gettingstarted/js/test/2}} . So on and
> so forth
> 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}
> //empty line
> $.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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