def render(self, wf_module: WfModule,
table: Optional[DataFrame]) -> ProcessResult:
"""Process `table` with module `render` method, for a ProcessResult.
If the `render` method raises an exception, this method will return an
error string. It is always an error for a module to raise an exception.
"""
if table is None:
return None # TODO disallow?
if not hasattr(self.module, 'render'):
return self._default_render(wf_module, table)
params = wf_module.create_parameter_dict(table)
return self._call_method('render', table, params)
def fetch(self, wf_module: WfModule) -> None:
"""Run `call_fetch(wf_module)` and write to `wf_module`.
`wf_module` will be set to `busy` until the fetch completes. After,
it will be either `ready` or `error`.
"""
# FIXME database writes probably belong in dispatch.py. Right now,
# here, half is dispatch stuff and half is database stuff.
if not hasattr(self.module, 'fetch'):
return
params = wf_module.create_parameter_dict(None)
wf_module.set_busy()
result = self.call_fetch(params)
result.truncate_in_place_if_too_big()
result.sanitize_in_place()
ModuleImpl.commit_result(wf_module, result)