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Source code for galaxy.tool_util.lint
"""This modules contains the functions that drive the tool linting framework.
LintContext: a container for LintMessages
LintMessage: the actual message and level
The idea is to define a LintContext and to apply a linting function ``foo`` on a
``target``. The ``level`` (defined by ``LintLevel``) determines which linting
messages are shown::
lint_ctx = LintContext(level) # level is the reporting level
lint_ctx.lint(..., lint_func = foo, lint_target = target, ...)
The ``lint`` function essentially calls ``foo(target, self)``. Hence
the function ``foo`` must have two parameters:
1. the object to lint
2. the lint context
In ``foo`` the lint context can be used to add LintMessages to the lint context
by using its ``valid``, ``info``, ``warn``, and ``error`` functions::
lint_foo(target, lint_ctx):
lint_ctx.error("target is screwed")
Calling ``lint`` prints out the messages emmited by the linter
function immediately. Which messages are shown can be determined with the
``level`` argument of the ``LintContext`` constructor. If set to ``SILENT``,
no messages will be printed.
For special lint targets it might be useful to have additional information
in the lint messages. This can be achieved by subclassing ``LintMessage``.
See for instance ``XMLLintMessageLine`` which has an additional argument
``node`` in its constructor which is used to determine the line and filename in
an XML document that caused the message.
In order to use this.
- the lint context needs to be initialized with the additional parameter
``lint_message_class=XMLLintMessageLine``
- the additional parameter needs to be added as well to calls adding messages
to the lint context, e.g. ``lint_ctx.error("some message", node=X)``. Note
that the additional properties must be given as keyword arguments.
"""
import inspect
from enum import IntEnum
from typing import (
Callable,
List,
Optional,
Type,
TypeVar,
Union
)
from galaxy.tool_util.parser import get_tool_source
from galaxy.util import etree, submodules
[docs]class LintMessage:
"""
a message from the linter
"""
[docs] def __init__(self, level: str, message: str, **kwargs):
self.level = level
self.message = message
def __eq__(self, other) -> bool:
"""
add equal operator to easy lookup of a message in a
List[LintMessage] which is usefull in tests
"""
if isinstance(other, str):
return self.message == other
if isinstance(other, LintMessage):
return self.message == other.message
return False
def __str__(self) -> str:
return f".. {self.level.upper()}: {self.message}"
def __repr__(self) -> str:
return f"LintMessage({self.message})"
[docs]class XMLLintMessageLine(LintMessage):
[docs] def __init__(self, level: str, message: str, node: Optional[etree.Element] = None):
super().__init__(level, message)
self.line = None
if node is not None:
self.line = node.sourceline
def __str__(self) -> str:
rval = super().__str__()
if self.line is not None:
rval += " ("
rval += str(self.line)
rval += ")"
return rval
[docs]class XMLLintMessageXPath(LintMessage):
[docs] def __init__(self, level: str, message: str, node: Optional[etree.Element] = None):
super().__init__(level, message)
self.xpath = None
if node is not None:
tool_xml = node.getroottree()
self.xpath = tool_xml.getpath(node)
def __str__(self) -> str:
rval = super().__str__()
if self.xpath is not None:
rval += f" [{self.xpath}]"
return rval
LintTargetType = TypeVar('LintTargetType')
# TODO: Nothing inherently tool-y about LintContext and in fact
# it is reused for repositories in planemo. Therefore, it should probably
# be moved to galaxy.util.lint.
[docs]class LintContext:
skip_types: List[str]
level: LintLevel
lint_message_class: Type[LintMessage]
object_name: Optional[str]
message_list: List[LintMessage]
[docs] def __init__(self,
level: Union[LintLevel, str],
lint_message_class: Type[LintMessage] = LintMessage,
skip_types: Optional[List[str]] = None,
object_name: Optional[str] = None):
self.skip_types = skip_types or []
if isinstance(level, str):
self.level = LintLevel[level.upper()]
else:
self.level = level
self.lint_message_class = lint_message_class
self.object_name = object_name
self.message_list = []
@property
def found_errors(self) -> bool:
return len(self.error_messages) > 0
@property
def found_warns(self) -> bool:
return len(self.warn_messages) > 0
[docs] def lint(self,
name: str,
lint_func: Callable[[LintTargetType, 'LintContext'], None],
lint_target: LintTargetType):
name = name.replace("tsts", "tests")[len("lint_"):]
if name in self.skip_types:
return
if self.level < LintLevel.SILENT:
# this is a relict from the past where the lint context
# was reset when called with a new lint_func, as workaround
# we save the message list, apply the lint_func (which then
# adds to the message_list) and restore the message list
# at the end (+ append the new messages)
tmp_message_list = list(self.message_list)
self.message_list = []
# call linter
lint_func(lint_target, self)
if self.level < LintLevel.SILENT:
# TODO: colorful emoji if in click CLI.
if self.error_messages:
status = "FAIL"
elif self.warn_messages:
status = "WARNING"
else:
status = "CHECK"
def print_linter_info(printed_linter_info):
if printed_linter_info:
return True
print(f"Applying linter {name}... {status}")
return True
plf = False
for message in self.error_messages:
plf = print_linter_info(plf)
print(f"{message}")
if self.level <= LintLevel.WARN:
for message in self.warn_messages:
plf = print_linter_info(plf)
print(f"{message}")
if self.level <= LintLevel.INFO:
for message in self.info_messages:
plf = print_linter_info(plf)
print(f"{message}")
if self.level <= LintLevel.VALID:
for message in self.valid_messages:
plf = print_linter_info(plf)
print(f"{message}")
self.message_list = tmp_message_list + self.message_list
@property
def valid_messages(self) -> List[LintMessage]:
return [x for x in self.message_list if x.level == "check"]
@property
def info_messages(self) -> List[LintMessage]:
return [x for x in self.message_list if x.level == "info"]
@property
def warn_messages(self) -> List[LintMessage]:
return [x for x in self.message_list if x.level == "warning"]
@property
def error_messages(self) -> List[LintMessage]:
return [x for x in self.message_list if x.level == "error"]
def __handle_message(self, level: str, message: str, *args, **kwargs) -> None:
if args:
message = message % args
self.message_list.append(self.lint_message_class(level=level, message=message, **kwargs))
[docs] def valid(self, message: str, *args, **kwargs) -> None:
self.__handle_message("check", message, *args, **kwargs)
[docs] def info(self, message: str, *args, **kwargs) -> None:
self.__handle_message("info", message, *args, **kwargs)
[docs] def error(self, message: str, *args, **kwargs) -> None:
self.__handle_message("error", message, *args, **kwargs)
[docs] def warn(self, message: str, *args, **kwargs) -> None:
self.__handle_message("warning", message, *args, **kwargs)
[docs] def failed(self, fail_level: Union[LintLevel, str]) -> bool:
if isinstance(fail_level, str):
fail_level = LintLevel[fail_level.upper()]
found_warns = self.found_warns
found_errors = self.found_errors
if fail_level == LintLevel.WARN:
lint_fail = (found_warns or found_errors)
elif fail_level >= LintLevel.ERROR:
lint_fail = found_errors
return lint_fail
[docs]def lint_tool_source(tool_source, level=LintLevel.ALL, fail_level=LintLevel.WARN, extra_modules=None, skip_types=None, name=None) -> bool:
"""
apply all (applicable) linters from the linters submodule
and the ones in extramodules
immediately print linter messages (wrt level) and return if linting failed (wrt fail_level)
"""
extra_modules = extra_modules or []
skip_types = skip_types or []
lint_context = LintContext(level=level, skip_types=skip_types, object_name=name)
lint_tool_source_with(lint_context, tool_source, extra_modules)
return not lint_context.failed(fail_level)
[docs]def get_lint_context_for_tool_source(tool_source, extra_modules=None, skip_types=None, name=None) -> LintContext:
"""
this is the silent variant of lint_tool_source
it returns the LintContext from which all linter messages
and the status can be obtained
"""
extra_modules = extra_modules or []
skip_types = skip_types or []
lint_context = LintContext(level=LintLevel.SILENT, skip_types=skip_types, object_name=name)
lint_tool_source_with(lint_context, tool_source, extra_modules)
return lint_context
[docs]def lint_xml(tool_xml, level=LintLevel.ALL, fail_level=LintLevel.WARN, lint_message_class=LintMessage, extra_modules=None, skip_types=None, name=None) -> bool:
"""
lint an xml tool
"""
extra_modules = extra_modules or []
skip_types = skip_types or []
lint_context = LintContext(level=level, lint_message_class=lint_message_class, skip_types=skip_types, object_name=name)
lint_xml_with(lint_context, tool_xml, extra_modules)
return not lint_context.failed(fail_level)
[docs]def lint_tool_source_with(lint_context, tool_source, extra_modules=None) -> LintContext:
extra_modules = extra_modules or []
import galaxy.tool_util.linters
tool_xml = getattr(tool_source, "xml_tree", None)
tool_type = tool_source.parse_tool_type() or "default"
linter_modules = submodules.import_submodules(galaxy.tool_util.linters)
linter_modules.extend(extra_modules)
for module in linter_modules:
lint_tool_types = getattr(module, "lint_tool_types", ["default"])
if not ("*" in lint_tool_types or tool_type in lint_tool_types):
continue
for (name, value) in inspect.getmembers(module):
if callable(value) and name.startswith("lint_"):
# Look at the first argument to the linter to decide
# if we should lint the XML description or the abstract
# tool parser object.
first_arg = inspect.getfullargspec(value).args[0]
if first_arg == "tool_xml":
if tool_xml is None:
# XML linter and non-XML tool, skip for now
continue
else:
lint_context.lint(name, value, tool_xml)
else:
lint_context.lint(name, value, tool_source)
return lint_context
[docs]def lint_xml_with(lint_context, tool_xml, extra_modules=None) -> LintContext:
extra_modules = extra_modules or []
tool_source = get_tool_source(xml_tree=tool_xml)
return lint_tool_source_with(lint_context, tool_source, extra_modules=extra_modules)