Examples of propagating config from service deployment contributor to filter

[Kevin Minder <ke...@hortonworks.com>]

Hey Dilli,

To see how a deployment contributor passes params into the deployment 
take a look at the contributeDataNodeResource method of
gateway-service-webhdfs/src/main/java/org/apache/hadoop/gateway/hdfs/WebHdfsDeploymentContributor.java 
method
in particular the lines below.

     params = new ArrayList<FilterParamDescriptor>();
     params.add( fileResource.createFilterParam().
         name( UrlRewriteServletFilter.REQUEST_URL_RULE_PARAM ).value( 
getQualifiedName() + "/inbound/datanode" ) );
     addRewriteFilter( context, service, fileResource, params );

This ends up calling the deployment contributor for the provider.  A 
good example of this is the contributeFilter method of
gateway-provider-rewrite/src/main/java/org/apache/hadoop/gateway/filter/rewrite/impl/UrlRewriteDeploymentContributor.java
This method simply passes the params into filter init params in the 
gateway.xml descriptor.

You can also look at
gateway-server/src/main/java/org/apache/hadoop/gateway/deploy/impl/DispatchDeploymentContributor.java
that is adding a filter init parameter depending upon a configuration 
parameter.  I don't think that HttpClientDispatch is currently using 
that value BTW.

Finally you can see how the filter init params are accessed between 
these two classes.
gateway-provider-rewrite/src/main/java/org/apache/hadoop/gateway/filter/rewrite/api/UrlRewriteServletFilter.java
gateway-provider-rewrite/src/main/java/org/apache/hadoop/gateway/filter/rewrite/impl/UrlRewriteRequest.java

Hope this saves you some time if you haven't already figured all of this 
out.

Kevin.

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Re: Examples of propagating config from service deployment contributor to filter

[Dilli Arumugam <da...@hortonworks.com>]

Thanks Kevin.
This information would help in investigating and fixing
KNOX-174: support service specific cap for buffering request entities for
replay against WWW-authenticate challenge
Dilli


On Mon, Sep 30, 2013 at 6:11 PM, Kevin Minder
<ke...@hortonworks.com>wrote:

> Hey Dilli,
>
> To see how a deployment contributor passes params into the deployment take
> a look at the contributeDataNodeResource method of
> gateway-service-webhdfs/src/**main/java/org/apache/hadoop/**gateway/hdfs/*
> *WebHdfsDeploymentContributor.**java method
> in particular the lines below.
>
>     params = new ArrayList<**FilterParamDescriptor>();
>     params.add( fileResource.**createFilterParam().
>         name( UrlRewriteServletFilter.**REQUEST_URL_RULE_PARAM ).value(
> getQualifiedName() + "/inbound/datanode" ) );
>     addRewriteFilter( context, service, fileResource, params );
>
> This ends up calling the deployment contributor for the provider.  A good
> example of this is the contributeFilter method of
> gateway-provider-rewrite/src/**main/java/org/apache/hadoop/**
> gateway/filter/rewrite/impl/**UrlRewriteDeploymentContributo**r.java
> This method simply passes the params into filter init params in the
> gateway.xml descriptor.
>
> You can also look at
> gateway-server/src/main/java/**org/apache/hadoop/gateway/**deploy/impl/**
> DispatchDeploymentContributor.**java
> that is adding a filter init parameter depending upon a configuration
> parameter.  I don't think that HttpClientDispatch is currently using that
> value BTW.
>
> Finally you can see how the filter init params are accessed between these
> two classes.
> gateway-provider-rewrite/src/**main/java/org/apache/hadoop/**
> gateway/filter/rewrite/api/**UrlRewriteServletFilter.java
> gateway-provider-rewrite/src/**main/java/org/apache/hadoop/**
> gateway/filter/rewrite/impl/**UrlRewriteRequest.java
>
> Hope this saves you some time if you haven't already figured all of this
> out.
>
> Kevin.
>

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