Dynamically obtain server/domain name on SWON service

[William Ramos]

Hi, community;

I have a SWON service where I'm generating a value as a URL which should be based on the server where the SWON service is running.

The company where I work has three different servers/domains:

dev.company.com

test.company.com

prod.company.com

So, for example if I'm running the SWON service on test.company.com it should generate the URL like this:

url:"https://test.company.com?someService;graphURI..."

... if running the service on dev.company.com it should look generate it like this:

url:"https://dev.company.com?someService;graphURI..."

The SWON code that I have looks like this:

<swon:Value arg:name="url" arg:value="https://test.company.com?someService;graphURI={= ?guri }"/>

...with the domain/server hardcoded, so I'm wondering if there's a built in function/mechanism to achieve this.

Thanks in advance.

[Holger Knublauch]

Hi William,

one thing to try would be the server URL config parameter (admin page):

You can query that value using smf:configParam("serverURL").

Alternatively, if changing this value has undesired side effects, you could probably make up another triple somewhere, e.g. by uploading a TTL file to each server.

HTH
Holger

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[Richard Cyganiak]

Hi William,

As Holger said, the best way to handle this is by setting the serverURL in the configuration.

Besides using smf:configParam to read the value of the setting, it can also be done using ui:createLink. That is a control element that creates an URL and assigns it to the variable ?link for further use. Its ui:absolute attribute must be set to true to get an absolute URL including the server base URL. For example:

<ui:createLink ui:absolute="true" ui:viewClass="ex:someService" arg:graphURI="{= ?guri }">
<swon:Value arg:name="url" arg:value="{= ?link }"/>
</ui:createLink>

This might assign the following value to the variable ?link:

http://localhost:8083/tbl/swp?_viewClass=ex:someService&graphURI=urn:x-evn-master:test

Another example that calls the GraphQL service instead of an SWP service:

<ui:createLink ui:absolute="true" ui:servlet="graphql/{= ?graphId }" arg:query="{= ?graphqlQuery }">
...
</ui:createLink>

This would set ?link to something like:

http://localhost:8083/tbl/graphql/test?query=...

See https://uispin.org/ui.html#createLink for more information.

Richard