feat: Common functions for interfacing with python-irodsclient

cubi_tk/irods_common.py

@@ -0,0 +1,184 @@
+from contextlib import contextmanager
+import getpass
+import os.path
+from pathlib import Path
+import sys
+from typing import Iterable
+
+import attr
+from irods.exception import CAT_INVALID_AUTHENTICATION, PAM_AUTH_PASSWORD_FAILED
+from irods.password_obfuscation import encode
+from irods.session import NonAnonymousLoginWithoutPassword, iRODSSession
+import logzero
+from logzero import logger
+from tqdm import tqdm
+
+# no-frills logger
+formatter = logzero.LogFormatter(fmt="%(message)s")
+output_logger = logzero.setup_logger(formatter=formatter)
+
+NUM_PARALLEL_SESSIONS = 4
+
+
+@attr.s(frozen=True, auto_attribs=True)
+class TransferJob:
+    """Encodes a transfer job from the local file system to the remote iRODS collection."""
+
+    #: Source path.
+    path_src: str
+
+    #: Destination path.
+    path_dest: str
+
+    #: Number of bytes to transfer.
+    bytes: int
+
+
+class iRODSCommon:
+    """Implementation of common iRODS utility functions."""
+
+    def __init__(self, ask: bool = False):
+        #: Path to iRODS environment file
+        # TODO: custom env path
+        self.irods_env_path = Path.home().joinpath(".irods", "irods_environment.json")
+        self.ask = ask
+
+        # check for outdated .irodsA file
+        self._check_auth()
+
+    @staticmethod
+    def get_irods_error(e: Exception):
+        """Return logger friendly iRODS exception."""
+        es = str(e)
+        return es if es and es != "None" else e.__class__.__name__
+
+    def _init_irods(self) -> iRODSSession:
+        """Connect to iRODS."""
+        try:
+            session = iRODSSession(irods_env_file=self.irods_env_path)
+            session.connection_timeout = 300
+            return session
+        except Exception as e:  # pragma: no cover
+            logger.error(f"iRODS connection failed: {self.get_irods_error(e)}")
+            raise
+
+    def _check_auth(self):
+        """Check auth status and login if needed."""
+        try:
+            self._init_irods().server_version
+            return 0
+        except NonAnonymousLoginWithoutPassword as e:  # pragma: no cover
+            logger.info(self.get_irods_error(e))
+            pass
+        except CAT_INVALID_AUTHENTICATION:  # pragma: no cover
+            logger.warning("Problem with your session token.")
+            self.irods_env_path.parent.joinpath(".irodsA").unlink()
+            pass
+
+        # No valid .irodsA file. Query user for password.
+        attempts = 0
+        while attempts < 3:
+            try:
+                session = iRODSSession(
+                    irods_env_file=self.irods_env_path,
+                    password=getpass.getpass(prompt="Please enter SODAR password:"),
+                )
+                token = session.pam_pw_negotiated
+                session.cleanup()
+                break
+            except PAM_AUTH_PASSWORD_FAILED:  # pragma: no cover
+                if attempts < 2:
+                    logger.warning("Wrong password. Please try again.")
+                    attempts += 1
+                    continue
+                else:
+                    logger.error("iRODS connection failed.")
+                    sys.exit(1)
+            except Exception as e:  # pragma: no cover
+                logger.error(f"iRODS connection failed: {self.get_irods_error(e)}")
+                sys.exit(1)
+
+        if self.ask and input(
+            "Save iRODS session for passwordless operation? [y/N] "
+        ).lower().startswith("y"):
+            self._save_irods_token(token)  # pragma: no cover
+        elif not self.ask:
+            self._save_irods_token(token)
+
+    def _save_irods_token(self, token: str):
+        """Retrieve PAM temp auth token 'obfuscate' it and save to disk."""
+        irods_auth_path = self.irods_env_path.parent.joinpath(".irodsA")
+        irods_auth_path.parent.mkdir(parents=True, exist_ok=True)
+
+        if isinstance(token, list) and token:
+            irods_auth_path.write_text(encode(token[0]))
+            irods_auth_path.chmod(0o600)
+        else:
+            logger.warning("No token found to be saved.")
+
+    @contextmanager
+    def _get_irods_sessions(self, count=NUM_PARALLEL_SESSIONS):
+        if count < 1:
+            count = 1
+        irods_sessions = [self._init_irods() for _ in range(count)]
+        try:
+            yield irods_sessions
+        finally:
+            for irods in irods_sessions:
+                irods.cleanup()
+
+
+class iRODSTransfer(iRODSCommon):
+    """
+    Transfer files to iRODS.
+
+    Attributes:
+    jobs -- iterable of TransferJob objects
+    """
+
+    def __init__(self, jobs: Iterable[TransferJob]):
+        super().__init__()
+        with self._get_irods_sessions(1) as s:
+            self.session = s[0]  # TODO: use more sessions
+        self.jobs = jobs
+        self.total_bytes = sum([job.bytes for job in self.jobs])
+        self.destinations = [job.path_dest for job in self.jobs]
+
+    def put(self):
+        # Double tqdm for currently transferred file info
+        # TODO: add more parenthesis after python 3.10
+        with tqdm(
+            total=self.total_bytes,
+            unit="B",
+            unit_scale=True,
+            unit_divisor=1024,
+            position=1,
+        ) as t, tqdm(total=0, position=0, bar_format="{desc}", leave=False) as file_log:
+            for job in self.jobs:
+                file_log.set_description_str(f"Current file: {job.path_src}")
+                try:
+                    self.session.data_objects.put(job.path_src, job.path_dest)
+                    t.update(job.bytes)
+                except Exception as e:  # pragma: no cover
+                    logger.error(f"Problem during transfer of {job.path_src}")
+                    logger.error(self.get_irods_error(e))
+                    sys.exit(1)
+                finally:
+                    self.session.cleanup()
+            t.clear()
+
+    def chksum(self):
+        """Compute remote md5 checksums for all jobs."""
+        common_prefix = os.path.commonpath(self.destinations)
+        for job in self.jobs:
+            if not job.path_src.endswith(".md5"):
+                output_logger.info(Path(job.path_dest).relative_to(common_prefix))
+                try:
+                    data_object = self.session.data_objects.get(job.path_dest)
+                    if not data_object.checksum:
+                        data_object.chksum()
+                except Exception as e:  # pragma: no cover
+                    logger.error("Problem during iRODS checksumming.")
+                    logger.error(self.get_irods_error(e))
+                finally:
+                    self.session.cleanup()

tests/test_irods_common.py

@@ -0,0 +1,129 @@
+from pathlib import Path
+import shutil
+from unittest.mock import ANY, MagicMock, patch
+
+import irods.exception
+from irods.session import NonAnonymousLoginWithoutPassword
+import pytest
+
+from cubi_tk.irods_common import TransferJob, iRODSCommon, iRODSTransfer
+
+
+@pytest.fixture
+def fake_filesystem(fs):
+    yield fs
+
+
+@patch("cubi_tk.irods_common.iRODSSession")
+def test_common_init(mocksession):
+    assert iRODSCommon().irods_env_path is not None
+    assert type(iRODSCommon().ask) is bool
+
+
+@patch("cubi_tk.irods_common.iRODSSession")
+def test_get_irods_error(mocksession):
+    e = irods.exception.NetworkException()
+    assert iRODSCommon().get_irods_error(e) == "NetworkException"
+    e = irods.exception.NetworkException("Connection reset")
+    assert iRODSCommon().get_irods_error(e) == "Connection reset"
+
+
+@patch("getpass.getpass")
+@patch("cubi_tk.irods_common.iRODSSession")
+def test_check_auth(mocksession, mockpass, fs):
+    fs.create_file(".irods/irods_environment.json")
+    password = "1234"
+
+    icommon = iRODSCommon()
+    mockpass.return_value = password
+    with patch.object(icommon, "_init_irods") as mockinit:
+        mockinit.side_effect = NonAnonymousLoginWithoutPassword()
+
+        # .irodsA not found, asks for password
+        icommon._check_auth()
+        mockpass.assert_called()
+        mocksession.assert_any_call(irods_env_file=ANY, password=password)
+
+    # .irodsA there, does not ask for password
+    mockpass.reset_mock()
+    mocksession.reset_mock()
+    icommon._check_auth()
+    mockpass.assert_not_called()
+    mocksession.assert_called_once()
+
+
+@patch("cubi_tk.irods_common.encode", return_value="it works")
+@patch("cubi_tk.irods_common.iRODSSession")
+def test_save_irods_token(mocksession, mockencode, fs):
+    token = [
+        "secure",
+    ]
+    icommon = iRODSCommon()
+    icommon.irods_env_path = Path("testdir/env.json")
+    icommon._save_irods_token(token=token)
+
+    assert icommon.irods_env_path.parent.joinpath(".irodsA").exists()
+    mockencode.assert_called_with("secure")
+
+
+@patch("cubi_tk.irods_common.iRODSSession")
+def test_init_irods(mocksession, fs):
+    fs.create_file(".irods/irods_environment.json")
+    fs.create_file(".irods/.irodsA")
+
+    iRODSCommon()._init_irods()
+    mocksession.assert_called()
+
+
+@patch("cubi_tk.irods_common.iRODSSession")
+def test_get_irods_sessions(mocksession):
+    with iRODSCommon()._get_irods_sessions(count=3) as sessions:
+        assert len(sessions) == 3
+    with iRODSCommon()._get_irods_sessions(count=-1) as sessions:
+        assert len(sessions) == 1
+
+
+# Test iRODSTransfer #########
+@pytest.fixture
+def jobs():
+    return (
+        TransferJob(path_src="myfile.csv", path_dest="dest_dir/myfile.csv", bytes=123),
+        TransferJob(path_src="folder/file.csv", path_dest="dest_dir/folder/file.csv", bytes=1024),
+    )
+
+
+@pytest.fixture
+def itransfer(jobs):
+    with patch("cubi_tk.irods_common.iRODSSession"):
+        return iRODSTransfer(jobs)
+
+
+def test_irods_transfer_init(jobs, itransfer):
+    assert itransfer.total_bytes == sum([job.bytes for job in jobs])
+    assert itransfer.destinations == [job.path_dest for job in jobs]
+
+
+def test_irods_transfer_put(fs, itransfer, jobs):
+    for job in jobs:
+        fs.create_file(job.path_src)
+        fs.create_dir(Path(job.path_dest).parent)
+
+    with patch.object(itransfer.session.data_objects, "put", wraps=shutil.copy):
+        itransfer.put()
+
+    for job in jobs:
+        assert Path(job.path_dest).exists()
+
+
+def test_irods_transfer_chksum(itransfer):
+    with patch.object(itransfer.session.data_objects, "get") as mockget:
+        mock_data_object = MagicMock()
+        mockget.return_value = mock_data_object
+        mock_data_object.checksum = None
+        mock_data_object.chksum = MagicMock()
+
+        itransfer.chksum()
+
+        assert mock_data_object.chksum.call_count == len(itransfer.destinations)
+        for path in itransfer.destinations:
+            mockget.assert_any_call(path)