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Source code for galaxy.tools.deps.resolvers
"""The module defines the abstract interface for dealing tool dependency resolution plugins."""
from abc import (
ABCMeta,
abstractmethod,
abstractproperty,
)
import six
import yaml
from galaxy.util import listify
from galaxy.util.dictifiable import Dictifiable
from ..requirements import ToolRequirement
[docs]@six.add_metaclass(ABCMeta)
class DependencyResolver(Dictifiable):
"""Abstract description of a technique for resolving container images for tool execution."""
# Keys for dictification.
dict_collection_visible_keys = ['resolver_type', 'resolves_simple_dependencies', 'can_uninstall_dependencies']
# A "simple" dependency is one that does not depend on the the tool
# resolving the dependency. Classic tool shed dependencies are non-simple
# because the repository install context is used in dependency resolution
# so the same requirement tags in different tools will have very different
# resolution.
disabled = False
resolves_simple_dependencies = True
can_uninstall_dependencies = False
config_options = {}
[docs] @abstractmethod
def resolve(self, requirement, **kwds):
"""Given inputs describing dependency in the abstract yield a Dependency object.
The Dependency object describes various attributes (script, bin,
version) used to build scripts with the dependency availble. Here
script is the env.sh file to source before running a job, if that is
not found the bin directory will be appended to the path (if it is
not ``None``). Finally, version is the resolved tool dependency
version (which may differ from requested version for instance if the
request version is 'default'.)
"""
[docs]class MultipleDependencyResolver(object):
"""Variant of DependencyResolver that can optionally resolve multiple dependencies together."""
[docs] @abstractmethod
def resolve_all(self, requirements, **kwds):
"""
Given multiple requirements yields a list of Dependency objects if and only if they may all be resolved together.
Unsuccessfull attempts should return an empty list.
:param requirements: list of tool requirements
:param type: [ToolRequirement] or ToolRequirements
:returns: list of resolved dependencies
:rtype: [Dependency]
"""
[docs]@six.add_metaclass(ABCMeta)
class ListableDependencyResolver(object):
""" Mix this into a ``DependencyResolver`` and implement to indicate
the dependency resolver can iterate over its dependencies and generate
requirements.
"""
[docs] @abstractmethod
def list_dependencies(self):
""" List the "simple" requirements that may be resolved "exact"-ly
by this dependency resolver.
"""
def _to_requirement(self, name, version=None):
return ToolRequirement(name=name, type="package", version=version)
[docs]class MappableDependencyResolver(object):
"""Mix this into a ``DependencyResolver`` to allow mapping files.
Mapping files allow adapting generic requirements to specific local implementations.
"""
def _setup_mapping(self, dependency_manager, **kwds):
mapping_files = dependency_manager.get_resolver_option(self, "mapping_files", explicit_resolver_options=kwds)
mappings = []
if mapping_files:
mapping_files = listify(mapping_files)
for mapping_file in mapping_files:
mappings.extend(MappableDependencyResolver._mapping_file_to_list(mapping_file))
self._mappings = mappings
@staticmethod
def _mapping_file_to_list(mapping_file):
with open(mapping_file, "r") as f:
raw_mapping = yaml.safe_load(f) or []
return map(RequirementMapping.from_dict, raw_mapping)
def _expand_mappings(self, requirement):
for mapping in self._mappings:
if mapping.matches_requirement(requirement):
requirement = mapping.apply(requirement)
break
return requirement
FROM_UNVERSIONED = object()
[docs]class RequirementMapping(object):
[docs] def __init__(self, from_name, from_version, to_name, to_version):
self.from_name = from_name
self.from_version = from_version
self.to_name = to_name
self.to_version = to_version
[docs] def matches_requirement(self, requirement):
"""Check if supplied ToolRequirement matches this mapping description.
For it to match - the names must match. Additionally if the
requirement is created with a version or with unversioned being set to
True additional checks are needed. If a version is specified, it must
match the supplied version exactly. If ``unversioned`` is True, then
the supplied requirement must be unversioned (i.e. its version must be
set to ``None``).
"""
if requirement.name != self.from_name:
return False
elif self.from_version is None:
return True
elif self.from_version is FROM_UNVERSIONED:
return requirement.version is None
else:
return requirement.version == self.from_version
[docs] def apply(self, requirement):
requirement = requirement.copy()
requirement.name = self.to_name
if self.to_version is not None:
requirement.version = self.to_version
return requirement
[docs] @staticmethod
def from_dict(raw_mapping):
from_raw = raw_mapping.get("from")
if isinstance(from_raw, dict):
from_name = from_raw.get("name")
raw_version = from_raw.get("version", None)
unversioned = from_raw.get("unversioned", False)
if unversioned and raw_version:
raise Exception("Cannot define both version and set unversioned to True.")
if unversioned:
from_version = FROM_UNVERSIONED
else:
from_version = str(raw_version) if raw_version is not None else raw_version
else:
from_name = from_raw
from_version = None
to_raw = raw_mapping.get("to")
if isinstance(to_raw, dict):
to_name = to_raw.get("name", from_name)
to_version = str(to_raw.get("version"))
else:
to_name = to_raw
to_version = None
return RequirementMapping(from_name, from_version, to_name, to_version)
[docs]@six.add_metaclass(ABCMeta)
class SpecificationAwareDependencyResolver(object):
"""Mix this into a :class:`DependencyResolver` to implement URI specification matching.
Allows adapting generic requirements to more specific URIs - to tailor name
or version to specified resolution system.
"""
@abstractmethod
def _expand_specs(self, requirement):
"""Find closest matching specification for discovered resolver and return new concrete requirement."""
[docs]class SpecificationPatternDependencyResolver(SpecificationAwareDependencyResolver):
"""Implement the :class:`SpecificationAwareDependencyResolver` with a regex pattern."""
@abstractproperty
def _specification_pattern(self):
"""Pattern of URI to match against."""
def _find_specification(self, specs):
pattern = self._specification_pattern
for spec in specs:
if pattern.match(spec.uri):
return spec
return None
def _expand_specs(self, requirement):
name = requirement.name
version = requirement.version
specs = requirement.specs
spec = self._find_specification(specs)
if spec is not None:
name = spec.short_name
version = spec.version or version
requirement = requirement.copy()
requirement.name = name
requirement.version = version
return requirement
[docs]@six.add_metaclass(ABCMeta)
class InstallableDependencyResolver(object):
""" Mix this into a ``DependencyResolver`` and implement to indicate
the dependency resolver can attempt to install new dependencies.
"""
[docs] @abstractmethod
def install_dependency(self, name, version, type, **kwds):
""" Attempt to install this dependency if a recipe to do so
has been registered in some way.
"""
[docs]@six.add_metaclass(ABCMeta)
class Dependency(Dictifiable):
dict_collection_visible_keys = ['dependency_type', 'exact', 'name', 'version', 'cacheable']
cacheable = False
[docs] @abstractmethod
def shell_commands(self):
"""
Return shell commands to enable this dependency.
"""
@abstractproperty
def exact(self):
""" Return true if version information wasn't discarded to resolve
the dependency.
"""
@property
def resolver_msg(self):
"""
Return a message describing this dependency
"""
return "Using dependency %s version %s of type %s" % (self.name, self.version, self.dependency_type)
[docs]class NullDependency(Dependency):
dependency_type = None
exact = True
@property
def resolver_msg(self):
"""
Return a message describing this dependency
"""
return "Dependency %s not found." % self.name