Enhance visibility of missing dependencies

satpy/readers/__init__.py

@@ -1,4 +1,4 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 # Copyright (c) 2015-2018 Satpy developers
 #
@@ -557,31 +557,24 @@
  reader, filenames, remaining_filenames = _get_reader_and_filenames(reader, filenames)
  (reader_kwargs, reader_kwargs_without_filter) = _get_reader_kwargs(reader, reader_kwargs)
 
- for idx, reader_configs in enumerate(configs_for_reader(reader)):
- if isinstance(filenames, dict):
- readers_files = set(filenames[reader[idx]])
- else:
- readers_files = remaining_filenames
+ if reader_kwargs is None:
+ reader_kwargs = {}
 
- try:
- reader_instance = load_reader(
- reader_configs,
- **reader_kwargs[None if reader is None else reader[idx]])
- except (KeyError, IOError, yaml.YAMLError) as err:
- LOG.info("Cannot use %s", str(reader_configs))
- LOG.debug(str(err))
+ for idx, reader_configs in enumerate(configs_for_reader(reader)):
+ readers_files = _get_readers_files(filenames, reader, idx, remaining_filenames)
+ reader_instance = _get_reader_instance(reader, reader_configs, idx, reader_kwargs)
+ if reader_instance is None or not readers_files:
+ # Reader initiliasation failed or no files were given
  continue
 
- if not readers_files:
- # we weren't given any files for this reader
- continue
  loadables = reader_instance.select_files_from_pathnames(readers_files)
  if loadables:
  reader_instance.create_storage_items(
  loadables,
  fh_kwargs=reader_kwargs_without_filter[None if reader is None else reader[idx]])
  reader_instances[reader_instance.name] = reader_instance
  remaining_filenames -= set(loadables)
+
  if not remaining_filenames:
  break
 
@@ -590,6 +583,32 @@
  return reader_instances
 
 
+def _get_readers_files(filenames, reader, idx, remaining_filenames):
+ if isinstance(filenames, dict):
+ return set(filenames[reader[idx]])
+ return remaining_filenames
+
+
+def _get_reader_instance(reader, reader_configs, idx, reader_kwargs):
+ reader_instance = None
+ try:
+ reader_instance = load_reader(
+ reader_configs,
+ **reader_kwargs[None if reader is None else reader[idx]])
+ except (KeyError, IOError) as err:
+ LOG.info("Cannot use %s", str(reader_configs))
+ LOG.debug(str(err))
+ except yaml.constructor.ConstructorError as err:
+ _log_yaml_error(reader_configs, err)
+
+ return reader_instance
+
+
+def _log_yaml_error(reader_configs, err):
+ LOG.error("Problem with %s", str(reader_configs))
+ LOG.error(str(err))
+
+
 def _early_exit(filenames, reader):
  if not filenames and not reader:
  # used for an empty Scene

satpy/tests/test_readers.py

@@ -1,4 +1,4 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 # Copyright (c) 2019, 2022, 2023 Satpy developers
 #
@@ -258,6 +258,11 @@
  Assumes that the VIIRS SDR reader exists and works.
  """
 
+ @pytest.fixture(autouse=True)
+ def inject_fixtures(self, caplog): # noqa: PT004
+ """Inject caplog to the test class."""
+ self._caplog = caplog
+
  def setUp(self):
  """Wrap HDF5 file handler with our own fake handler."""
  from satpy.readers.viirs_sdr import VIIRSSDRFileHandler
@@ -439,6 +444,24 @@
  assert "abi_l1b" in readers
  assert len(list(readers["abi_l1b"].available_dataset_ids)) == 0
 
+ @mock.patch("satpy.readers.load_reader")
+ def test_yaml_error_message(self, load_reader):
+ """Test that YAML errors are logged properly."""
+ import logging
+
+ import yaml
+
+ from satpy.readers import load_readers
+
+ filenames = ["AVHR_xxx_1B_M01_20241015100703Z_20241015114603Z_N_O_20241015105547Z.nat"]
+ error_message = "YAML test error message"
+ load_reader.side_effect = yaml.constructor.ConstructorError(error_message)
+
+ with self._caplog.at_level(logging.ERROR):
+ with pytest.raises(ValueError, match="No supported files found"):
+ _ = load_readers(filenames=filenames, reader="avhrr_l1b_eps")
+ assert error_message in self._caplog.text
+
 
 class TestFindFilesAndReaders:
  """Test the find_files_and_readers utility function."""