code: def run(ident):
      '''Launch or resume an harvesting for a given source if none is running'''
      source = get_source(ident)
      cls = backends.get(current_app, source.backend)
      backend = cls(source)
      backend.harvest(f run(ident):
      '''Launch or resume an harvesting for a given source if none is running'''
      source = get_source(ident)
      cls = backends.get(current_app, source.backend)
      backend = cls(source)
      backend.harvest()
docs: Launch or resume an harvesting for a given source if none is running