[MapProxy] S3 Configuration and 500 Errors

[Holloway, Robert]

We are having some issues getting Mapproxy to reference our S3 cache we
created and following the example at
https://mapproxy.org/docs/nightly/caches.html#s3. We have tested to make
sure that we can access our S3. We have installed Boto3. Do we need to
execute/import Boto3 into Mapproxy somehow? It wasn't clear in the
documentation if there was any other configuration like a BOTO3 session
somewhere.

We are using a clean install of mapproxy - only changing the relevant
portion to try and get S3 working:

<pre>
services:
  demo:
  tms:
    use_grid_names: true
    # origin for /tiles service
    origin: 'nw'
  kml:
      use_grid_names: true
  wmts:
  wms:
    srs: ['EPSG:4326', 'EPSG:3857', 'CRS:84', 'EPSG:900913', 'EPSG:102100',
'EPSG:102113', 'EPSG:2229', 'EPSG:2230', 'EPSG:26911', 'EPSG:26915']
    max_output_pixels: [10000, 10000]

layers:
  - name: s3_test_layer
    title: S3 Test Layer
    sources: [S3_Test_Cache]
    md:
      abstract: RGB [2017]

cache:
  S3_Test_Cache:
    grids: [webmercator_20]
    sources: [S3_Test_rgbp_tms, S3_Test_rgbj_tms]
    format: mixed
    request_format: image/png
    disable_storage: true
    cache:
      type: s3
      directory: /s3_src/
      bucket_name: test_bucket

sources:
  S3_Test_rgbj_tms:
    type: tile
    url: /s3_src/rgb/%(z)s/%(x)s/%(y)s.jpg
    coverage:
      bbox: [-117.207,33.4322,-117.055,33.5544]
      bbox_srs: 'EPSG:4326'
    grid: mercator_20
    transparent: true
  S3_Test_rgbp_tms:
    type: tile
    url: /s3_src/rgb/%(z)s/%(x)s/%(y)s.png
    coverage:
      bbox: [-117.207,33.4322,-117.055,33.5544]
      bbox_srs: 'EPSG:4326'
    grid: mercator_20
    transparent: true

grids:
    webmercator:
        base: GLOBAL_WEBMERCATOR
    webmercator_20:
        base: GLOBAL_WEBMERCATOR
        num_levels: 21

globals:
  cache:
    s3:
      profile_name: default
</pre>


We are using apache2 and mod_wsgi - here are the error logs when we hit the
server:

mod_wsgi (pid=34395): Target WSGI script '/var/www/mapproxy/config.py'
cannot be loaded as Python module.
mod_wsgi (pid=34395): Exception occurred processing WSGI script
'/var/www/mapproxy/config.py'.
Traceback (most recent call last):
   File "/var/www/mapproxy/config.py", line 10, in <module>
     application = make_wsgi_app(r'/var/www/mapproxy/mapproxy.yaml')
   File "/usr/local/lib/python2.7/dist-packages/mapproxy/wsgiapp.py", line
105, in make_wsgi_app
     conf = load_configuration(mapproxy_conf=services_conf,
ignore_warnings=ignore_config_warnings)
   File "/usr/local/lib/python2.7/dist-packages/mapproxy/config/loader.py",
line 1957, in load_configuration
     raise ConfigurationError(ex)
 ConfigurationError: while scanning for the next token
 found character that cannot start any token
   in "/var/www/mapproxy/mapproxy.yaml", line 45, column 10

Our configuration for S3 has grown dramatically as we have scoured the web
for hints / information about how to get this working.  The configuration
was much simpler in the beginning so we may have to start by stripping down
what we have in there-- hopefully with someone's help from here.

Thanks,
R Holloway
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