[GeoNode-devel] generation of layer's thumbnail with a custom base map (Paolo Corti)

Wed Mar 6 08:45:11 PST 2019

Hi Toni
I am back on this. Many thanks for your insightful comments.
I found the way to bypass the cache. I noticed that the requests to the
basemap API are sent to printng in the correct form (which includes the API
key). But, even then, the background map is missing in the thumbnail. This
is not happening with OpenStreetMap.
I cannot see errors in the log file, so I am not sure why this is
happening. Definitely java debugging the plugin code would help I think.
cheers and many thanks again
Paolo

On Tue, Feb 26, 2019 at 2:34 AM Toni Schönbuchner <
toni.schoenbuchner at csgis.de> wrote:

> Dear Paolo,
>
> sorry I´ve might have sent you on a wrong track. But I think printing
> plugin (mapfish) and printng are different extensions.
>
> The one you might be interested in should be:
>
> https://github.com/boundlessgeo/geoserver-exts/tree/46dc818caf57d2b5ca1d04e8f40926c67b11493f/printng
>
> where you find some docs here:
>
> https://github.com/boundlessgeo/geoserver-exts/blob/46dc818caf57d2b5ca1d04e8f40926c67b11493f/printng/doc/api.rst
>
> In case of the caching behavior maybe it helps  to dig a bit in code
>
> https://github.com/boundlessgeo/geoserver-exts/blob/46dc818caf57d2b5ca1d04e8f40926c67b11493f/printng/src/main/java/org/geoserver/printng/PrintUserAgentCallback.java#L156
>
> So from what I see caching has nothing to do with GWC but with a base64
> string written to cacheDIr:
>
> https://github.com/boundlessgeo/geoserver-exts/blob/46dc818caf57d2b5ca1d04e8f40926c67b11493f/printng/src/main/java/org/geoserver/printng/PrintUserAgentCallback.java#L147
>
> Where cacheDir is the java.io.tmpdir value.  Which might be just /tmp or
> /var/tmp on Linux plattforms.
>
> https://github.com/boundlessgeo/geoserver-exts/blob/46dc818caf57d2b5ca1d04e8f40926c67b11493f/printng/src/main/java/org/geoserver/printng/PrintSupport.java#L28
>
> My guess is your baselayer is kicked out somewhere here:
>
> https://github.com/boundlessgeo/geoserver-exts/blob/46dc818caf57d2b5ca1d04e8f40926c67b11493f/printng/src/main/java/org/geoserver/printng/PrintUserAgentCallback.java#L92
>
> Can you double check that your sent html fulfills all requirements like
> img tags, correct style attribute with
> no display: none etc in other words what the if statements expect?
>
> Another thing what could fail is when loading the resource:
>
> https://github.com/boundlessgeo/geoserver-exts/blob/46dc818caf57d2b5ca1d04e8f40926c67b11493f/printng/src/main/java/org/geoserver/printng/PrintUserAgentCallback.java#L78
>
> Unfortunately I´m not a Java guy at all, so others might definitly know
> better.
>
>
> Best regards,
>
> Toni
>
>
>
> Am 26.02.2019 um 00:20 schrieb Paolo Corti <pcorti at gmail.com>:
>
> Hi Toni
>
> thanks for helping with this.
>
> As a first thing, I tried to add the base layers IP in the hosts
> section of config.yaml (with !dnsMatch).
> What is confusing me, looking at the log, is that GeoServer is trying
> to read the tiles from the cache, as it would be a local layer:
>
> ....
> 2019-02-25 23:16:25,811 DEBUG [geoserver.printng] - using cache for
> http://t4.tianditu.com/DataServer?T=vec_w&X=14&Y=7&L=4&tk=mykey
> 2019-02-25 23:16:25,812 DEBUG [geoserver.printng] - using cache for
> http://t4.tianditu.com/DataServer?T=vec_w&X=14&Y=5&L=4&tk=mykey
> ...
>
> not sure how to solve this. Maybe I'll ask in the GeoServer list
> best
> Paolo
>
> On Sat, Feb 23, 2019 at 3:38 PM Toni Schönbuchner
> <toni.schoenbuchner at csgis.de> wrote:
>
>
> Dear Paolo,
>
> some time ago I´ve been in a similar situation trying to debug thumbnails
> with leaflet.
> Unfortuantely I could not find docs for printing execept:
>
> https://docs.geoserver.org/latest/en/user/extensions/printing/index.html
>
> https://docs.geoserver.org/stable/en/user/extensions/printing/configuration.html
>
> However what helped me was a to double check that cleaned markup has
> everything we need:
>
> https://github.com/GeoNode/geonode/blob/master/geonode/static/geonode/js/utils/thumbnail.js#L17
>
> I did this by just testing the code in browser console and adding the
> cloned map to the body.
> Then to work a bit faster I´ve used https://www.getpostman.com/ to send
> the generated markup to the printing endpoint.
>
> If I remember correctly I´ve faced an issue with thumbnail.js deleting to
> much and some SSL mixed
> content blocking.
>
> Not much, but hopefully a start.
>
> cheers,
>
> Toni
>
>
>
> Message: 1
> Date: Fri, 22 Feb 2019 17:35:04 -0500
> From: Paolo Corti <pcorti at gmail.com>
> To: geonode-devel <geonode-devel at lists.osgeo.org>
> Subject: [GeoNode-devel] generation of layer's thumbnail with a custom
> base map
> Message-ID:
> <CAHXrU-KOd-v4aivGgvz3O9c0Sv-qmSmW=4gLT1QKTH5Mgidbfg at mail.gmail.com>
> Content-Type: text/plain; charset="UTF-8"
>
> Hi GeoNode developers
>
> We have the following problem: in one of our instances we are using
> some custom basemaps. When using the "Set Thumbnail" feature from
> layer page using one of this custom base maps, the thumbnail is
> created but only the layer is rendered, in a white background.
> Debugging the code, it looks like the thumbnail is generated by
> sending a post request to geoserver/rest/printng (in the
> geoserver/helpers.py/_render_thumbnail).
> Where can I find some documentation about this printng GeoServer endpoint?
>
> Thanks
> Paolo
>
> --
> Paolo Corti
> Geospatial software developer
> web: http://www.paolocorti.net
> twitter: @capooti
> skype: capooti
>
>
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>
>
> --
> Paolo Corti
> Geospatial software developer
> web: http://www.paolocorti.net
> twitter: @capooti
> skype: capooti
>
>
>

-- 
Paolo Corti
Geospatial software developer
web: http://www.paolocorti.net
twitter: @capooti
skype: capooti
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