[Feature] Allow other WPS references in wps_processes.yml config file

[fmigneault]

Context

When Weaver starts (or using CLI with #106), function weaver.processes.utils.register_wps_processes_from_config is called to process file wps_processes.yml (or equivalent). This file assumes WPS-1 processes since owslib.wps.WebProcessingService is used to call the specified URLs. WPS-2 are explicitly skipped (why? maybe parsing problem?).

After resolution of the processes from these URL, the corresponding WPS-REST and CWL definitions are generated following this call stack :

weaver.processes.utils._get_deploy_process_info
weaver.processes.wps_package.get_process_definition
weaver.processes.wps_package._generate_process_with_cwl_from_reference

Since _generate_process_with_cwl_from_reference already handles the WPS-1/2 vs WPS-REST formats to retrieve the details, we could easily extend register_wps_processes_from_config so that it supports any WPS reference.

Feature

• Add support of the WPS-REST and WPS-2 references in register_wps_processes_from_config

• Improvements for WebProcessingService calls, we can skip the re-fetch of the HTTP request like so:

  resp = requests.request("get", wps_url)
  wps = WebProcessingService(wps_url, skip=True)
  [detect wps-rest, eg: resp.json() has "process" section]
  if not wps_rest: 
      prefetched_xml  = resp.content # (or .text ?)
      wps.get_capabilities(xml=prefetched_xml)
  else :
      [process wps-rest]
  [...]