[MapProxy] Image processing error

Discussion:

Sebastijan Sekulić

2018-07-04 13:32:10 UTC

Hi,
so I am trying to add a WMS source to my MapProxy, but on the demo page, I
get an error.
Error while processing image file: cannot identify image file
<mapproxy.imageReadBufWrapper objerct at 0x7fbed4360f50>.

I have tracked the error to Line 153 in wms.py (It stops at result_bf =
result.as_buffer(img_opts)), if that helps. I think it should be something
with pillow having a problem with the image format, but I don't have
expertise in that.

I don't get any console outputs except request (no errors).

If I make a request with postman or with requests, it renders and downloads
properly. The image format is png8, and I am using MapProxy 1.11 on Ubuntu.

If you need .yaml and request, I can provide as a download link or send
privately, as I don't want to expose source links.

Thanks,
Seb.

David Pavlíček

2018-11-06 12:42:00 UTC

Permalink

Hi,
did you solve that Issue? I'm experiencing pretty much the same problem.
Our MapProxy yesterday starts to respond with: "error while processing
image file: cannot identify image file <mapproxy.image.ReadBufWrapper
object at 0x7f67d86e6c10>

I reduce the config to simplest one possible, but with no luck. Error is
still there. Our config is as follows:

services:
demo:
wms:
srs: ['EPSG:5514']
sources:
dtm_praha:
type: wms
req:
url: http://mpp.praha.eu/arcgis/services/DTMP/DTMP/MapServer/WMSServer
?
transparent: true
layers: 0,1,2,3

layers:
- name: DTMP
title: DTMP
sources: [dtm_praha]
globals:
image:
resampling_method: bilinear

We are running MapProxy under Apache2 on Debian Linux behind HTTP proxy.
Packages up to date. I also try to run developlment server with that
config. And output is:

[2018-11-06 13:21:31,681] mapproxy.source.request - INFO - GET
http://mpp.praha.eu/arcgis/services/DTMP/DTMP/MapServer/WMSServer?styles=&format=image%2Fpng&height=899&bbox=-749443.5125,-1052941.0375,-749412.1875,-1052918.5625&transparent=True&layers=0,1,2,3&service=WMS&srs=EPSG%3A5514&request=GetMap&width=1253&version=1.1.1
200 10.0 330
[2018-11-06 13:21:31,689] mapproxy.image - DEBUG - converting image from
ImageOptions(encoding_options={}, resampling='bilinear', transparent=True)
-> ImageOptions(bgcolor='#ffffff', colors=256, encoding_options={},
format='image/png', resampling='bilinear', transparent=True)
[2018-11-06 13:21:31,689] mapproxy.image - DEBUG -
file(<mapproxy.image.ReadBufWrapper object at 0x7f67d86e6c10>) -> image
[info] 10.144.35.192 - - [06/Nov/2018 13:21:31] "GET
/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=image/png&TRANSPARENT=true&LAYERS=DTMP&CRS=EPSG%3A5514&STYLES=&WIDTH=1253&HEIGHT=899&BBOX=-749443.5125000001%2C-1052941.0375%2C-749412.1875000001%2C-1052918.5625
HTTP/1.1" 200 -

But WMS response contains no image, only XML describing error mentioned
above.

Any advices?

st 4. 7. 2018 v 15:32 odesÃlatel Sebastijan SekuliÄ <

Post by Sebastijan SekuliÄ
Hi,
so I am trying to add a WMS source to my MapProxy, but on the demo page, I
get an error.
Error while processing image file: cannot identify image file
<mapproxy.imageReadBufWrapper objerct at 0x7fbed4360f50>.
I have tracked the error to Line 153 in wms.py (It stops at result_bf =
result.as_buffer(img_opts)), if that helps. I think it should be something
with pillow having a problem with the image format, but I don't have
expertise in that.
I don't get any console outputs except request (no errors).
If I make a request with postman or with requests, it renders and
downloads properly. The image format is png8, and I am using MapProxy 1.11
on Ubuntu.
If you need .yaml and request, I can provide as a download link or send
privately, as I don't want to expose source links.
Thanks,
Seb.
_______________________________________________
MapProxy mailing list
https://lists.osgeo.org/mailman/listinfo/mapproxy

Lukas Macur

2018-11-06 13:51:09 UTC

Permalink

Hello, I believe the problem is on source site, that is not working
http://mpp.praha.eu/arcgis/services/DTMP/DTMP/MapServer/WMSServer
http://mpp.praha.eu
<http://mpp.praha.eu/arcgis/services/DTMP/DTMP/MapServer/WMSServer> - is
working, but the arcgis server services are not ok (
http://mpp.praha.eu/arcgis/services
<http://mpp.praha.eu/arcgis/services/DTMP/DTMP/MapServer/WMSServer>).

Regards,
LM

Post by David PavlÃÄek
Hi,
did you solve that Issue? I'm experiencing pretty much the same problem.
Our MapProxy yesterday starts to respond with: "error while processing
image file: cannot identify image file <mapproxy.image.ReadBufWrapper
object at 0x7f67d86e6c10>
I reduce the config to simplest one possible, but with no luck. Error is
srs: ['EPSG:5514']
type: wms
http://mpp.praha.eu/arcgis/services/DTMP/DTMP/MapServer/WMSServer?
transparent: true
layers: 0,1,2,3
- name: DTMP
title: DTMP
sources: [dtm_praha]
resampling_method: bilinear
We are running MapProxy under Apache2 on Debian Linux behind HTTP proxy.
Packages up to date. I also try to run developlment server with that
[2018-11-06 13:21:31,681] mapproxy.source.request - INFO - GET
http://mpp.praha.eu/arcgis/services/DTMP/DTMP/MapServer/WMSServer?styles=&format=image%2Fpng&height=899&bbox=-749443.5125,-1052941.0375,-749412.1875,-1052918.5625&transparent=True&layers=0,1,2,3&service=WMS&srs=EPSG%3A5514&request=GetMap&width=1253&version=1.1.1
200 10.0 330
[2018-11-06 13:21:31,689] mapproxy.image - DEBUG - converting image from
ImageOptions(encoding_options={}, resampling='bilinear', transparent=True)
-> ImageOptions(bgcolor='#ffffff', colors=256, encoding_options={},
format='image/png', resampling='bilinear', transparent=True)
[2018-11-06 13:21:31,689] mapproxy.image - DEBUG -
file(<mapproxy.image.ReadBufWrapper object at 0x7f67d86e6c10>) -> image
[info] 10.144.35.192 - - [06/Nov/2018 13:21:31] "GET
/wms?SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&FORMAT=image/png&TRANSPARENT=true&LAYERS=DTMP&CRS=EPSG%3A5514&STYLES=&WIDTH=1253&HEIGHT=899&BBOX=-749443.5125000001%2C-1052941.0375%2C-749412.1875000001%2C-1052918.5625
HTTP/1.1" 200 -
But WMS response contains no image, only XML describing error mentioned
above.
Any advices?
st 4. 7. 2018 v 15:32 odesÃlatel Sebastijan SekuliÄ <

Post by Sebastijan SekuliÄ
Hi,
so I am trying to add a WMS source to my MapProxy, but on the demo page,
I get an error.
Error while processing image file: cannot identify image file
<mapproxy.imageReadBufWrapper objerct at 0x7fbed4360f50>.
I have tracked the error to Line 153 in wms.py (It stops at result_bf =
result.as_buffer(img_opts)), if that helps. I think it should be something
with pillow having a problem with the image format, but I don't have
expertise in that.
I don't get any console outputs except request (no errors).
If I make a request with postman or with requests, it renders and
downloads properly. The image format is png8, and I am using MapProxy 1.11
on Ubuntu.
If you need .yaml and request, I can provide as a download link or send
privately, as I don't want to expose source links.
Thanks,
Seb.
_______________________________________________
MapProxy mailing list
https://lists.osgeo.org/mailman/listinfo/mapproxy

_______________________________________________
MapProxy mailing list
https://lists.osgeo.org/mailman/listinfo/mapproxy

David Pavlíček

2018-11-06 14:08:26 UTC

Permalink

I didn't think so...
http://mpp.praha.eu/arcgis/services/DTMP/DTMP/MapServer/WMSServer?request=GetCapabilities&service=WMS
is working as expected. Also getmap request from debug session is working
properly... There must be another issue...

Post by Lukas Macur
Hello, I believe the problem is on source site, that is not working
http://mpp.praha.eu/arcgis/services/DTMP/DTMP/MapServer/WMSServer
http://mpp.praha.eu
<http://mpp.praha.eu/arcgis/services/DTMP/DTMP/MapServer/WMSServer> - is
working, but the arcgis server services are not ok (
http://mpp.praha.eu/arcgis/services
<http://mpp.praha.eu/arcgis/services/DTMP/DTMP/MapServer/WMSServer>).
Regards,
LM

Post by Sebastijan SekuliÄ
Hi,
so I am trying to add a WMS source to my MapProxy, but on the demo page,
I get an error.
Error while processing image file: cannot identify image file
<mapproxy.imageReadBufWrapper objerct at 0x7fbed4360f50>.
I have tracked the error to Line 153 in wms.py (It stops at result_bf =
result.as_buffer(img_opts)), if that helps. I think it should be something
with pillow having a problem with the image format, but I don't have
expertise in that.
I don't get any console outputs except request (no errors).
If I make a request with postman or with requests, it renders and
downloads properly. The image format is png8, and I am using MapProxy 1.11
on Ubuntu.
If you need .yaml and request, I can provide as a download link or send
privately, as I don't want to expose source links.
Thanks,
Seb.
_______________________________________________
MapProxy mailing list
https://lists.osgeo.org/mailman/listinfo/mapproxy

_______________________________________________
MapProxy mailing list
https://lists.osgeo.org/mailman/listinfo/mapproxy

David Pavlíček

2018-11-08 18:58:33 UTC

Permalink

I have finally resolved this issue. It was caused by our http proxy which
adds accept-encoding:gzip to all requests. Thus all images were gziped and
not readable by PIL.

Some libraries can handle this by checking incoming headers and then
decompress content if necessary. But this is not case of urllib2 used by
mapproxy.

So, make sure that your http proxy behaves as expected!

Best regards David

Post by David PavlÃÄek
I didn't think so...
http://mpp.praha.eu/arcgis/services/DTMP/DTMP/MapServer/WMSServer?request=GetCapabilities&service=WMS
is working as expected. Also getmap request from debug session is working
properly... There must be another issue...

Post by Sebastijan SekuliÄ
Hi,
so I am trying to add a WMS source to my MapProxy, but on the demo
page, I get an error.
Error while processing image file: cannot identify image file
<mapproxy.imageReadBufWrapper objerct at 0x7fbed4360f50>.
I have tracked the error to Line 153 in wms.py (It stops at result_bf =
result.as_buffer(img_opts)), if that helps. I think it should be something
with pillow having a problem with the image format, but I don't have
expertise in that.
I don't get any console outputs except request (no errors).
If I make a request with postman or with requests, it renders and
downloads properly. The image format is png8, and I am using MapProxy 1.11
on Ubuntu.
If you need .yaml and request, I can provide as a download link or send
privately, as I don't want to expose source links.
Thanks,
Seb.
_______________________________________________
MapProxy mailing list
https://lists.osgeo.org/mailman/listinfo/mapproxy

_______________________________________________
MapProxy mailing list
https://lists.osgeo.org/mailman/listinfo/mapproxy