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template.py
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template.py
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# -*- coding: utf-8 -*-
#
# Copyright 2020 - Swiss Data Science Center (SDSC)
# A partnership between École Polytechnique Fédérale de Lausanne (EPFL) and
# Eidgenössische Technische Hochschule Zürich (ETHZ).
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Template models."""
import copy
import json
import os
import tempfile
from abc import abstractmethod
from pathlib import Path
from typing import Any, Dict, Generator, List, Optional, Tuple, Union
import jinja2
import yaml
from renku.core import errors
from renku.core.management import RENKU_HOME
from renku.core.utils.os import get_safe_relative_path, hash_file
TEMPLATE_MANIFEST = "manifest.yaml"
class TemplatesSource:
"""Base class for Renku template sources."""
def __init__(self, path, source, reference, version):
self.path: Path = Path(path)
self.source: str = source
self.reference: Optional[str] = reference
self.version: str = version
self.manifest: TemplatesManifest = TemplatesManifest.from_path(path / TEMPLATE_MANIFEST)
@classmethod
@abstractmethod
def fetch(cls, source: Optional[str], reference: Optional[str]) -> "TemplatesSource":
"""Fetch an embedded or remote template."""
raise NotImplementedError
@property
def templates(self) -> List["Template"]:
"""Return list of templates."""
for template in self.manifest.templates:
template.templates_source = self
template.validate(skip_files=False)
return self.manifest.templates
def is_update_available(self, id: str, reference: Optional[str], version: Optional[str]) -> Tuple[bool, str]:
"""Return True if an update is available along with the latest reference of a template."""
latest = self.get_latest_reference_and_version(id=id, reference=reference, version=version)
if not latest:
return False, reference
latest_reference, latest_version = latest
update_available = latest_reference != reference or latest_version != version
return update_available, latest_reference
@abstractmethod
def get_all_references(self, id) -> List[str]:
"""Return all available versions for a template id."""
raise NotImplementedError
@abstractmethod
def get_latest_reference_and_version(
self, id: str, reference: Optional[str], version: Optional[str]
) -> Optional[Tuple[str, str]]:
"""Return latest reference and version number of a template."""
raise NotImplementedError
@abstractmethod
def get_template(self, id, reference: Optional[str]) -> Optional["Template"]:
"""Return a template at a specific reference."""
raise NotImplementedError
class TemplatesManifest:
"""Manifest file for Renku templates."""
def __init__(self, content: List[Dict]):
self._content: List[Dict] = content
self._templates: Optional[List[Template]] = None
self.validate()
@classmethod
def from_path(cls, path: Union[Path, str]) -> "TemplatesManifest":
"""Extract template metadata from the manifest file."""
try:
return cls.from_string(Path(path).read_text())
except FileNotFoundError as e:
raise errors.InvalidTemplateError(f"There is no manifest file '{path}'") from e
except UnicodeDecodeError as e:
raise errors.InvalidTemplateError(f"Cannot read manifest file '{path}'") from e
@classmethod
def from_string(cls, content: str) -> "TemplatesManifest":
"""Extract template metadata from the manifest file."""
try:
manifest = yaml.safe_load(content)
except yaml.YAMLError as e:
raise errors.InvalidTemplateError("Cannot parse manifest file") from e
else:
manifest = TemplatesManifest(manifest)
return manifest
@property
def templates(self) -> List["Template"]:
"""Return list of available templates info in the manifest."""
if self._templates is None:
self._templates: List[Template] = [
Template(
id=t.get("id") or t.get("folder"),
name=t.get("name"),
description=t.get("description"),
parameters=t.get("parameters") or t.get("variables"),
icon=t.get("icon"),
immutable_files=t.get("immutable_template_files", []),
allow_update=t.get("allow_template_update", True),
source=None,
reference=None,
version=None,
path=None,
templates_source=None,
)
for t in self._content
]
return self._templates
def get_raw_content(self) -> List[Dict]:
"""Return raw manifest file content."""
return copy.deepcopy(self._content)
def validate(self):
"""Validate manifest content."""
if not self._content:
raise errors.InvalidTemplateError("Cannot find any valid template in manifest file")
elif not isinstance(self._content, list):
raise errors.InvalidTemplateError(f"Invalid manifest content type: '{type(self._content).__name__}'")
# NOTE: First check if required fields exists for creating Template instances
for template in self._content:
if not isinstance(template, dict):
raise errors.InvalidTemplateError(f"Invalid template type: '{type(template).__name__}'")
id = template.get("id") or template.get("folder")
if not id:
raise errors.InvalidTemplateError(f"Template doesn't have an id: '{template}'")
parameters = template.get("parameters") or template.get("variables")
if parameters:
if not isinstance(parameters, dict):
raise errors.InvalidTemplateError(f"Invalid template variable type: '{type(parameters).__name__}'")
for key, parameter in parameters.items():
if isinstance(parameter, str): # NOTE: Backwards compatibility
template["variables"][key] = {"description": parameter}
for template in self.templates:
template.validate(skip_files=True)
class Template:
"""Template files and metadata from a template source."""
REQUIRED_ATTRIBUTES = ("name",)
REQUIRED_FILES = (os.path.join(RENKU_HOME, "renku.ini"), "Dockerfile")
def __init__(
self,
id: str,
name: str,
description: str,
parameters: Dict[str, Dict[str, Any]],
icon: str,
immutable_files: List[str],
allow_update: bool,
source: Optional[str],
reference: Optional[str],
version: Optional[str],
path: Optional[Path],
templates_source: Optional[TemplatesSource],
):
self.path: Path = path
self.source = source
self.reference = reference
self.version = version
self.id: str = id
self.name: str = name
self.description: str = description
self.icon = icon
self.immutable_files: List[str] = immutable_files or []
self.allow_update: bool = allow_update
parameters = parameters or {}
self.parameters: List[TemplateParameter] = [
TemplateParameter.from_dict(name=k, value=v) for k, v in parameters.items()
]
self._templates_source: Optional[TemplatesSource] = templates_source
@property
def templates_source(self) -> Optional[TemplatesSource]:
"""Return template's source."""
return self._templates_source
@templates_source.setter
def templates_source(self, templates_source: TemplatesSource):
"""Set templates source for this template."""
self._templates_source = templates_source
self.source = templates_source.source
self.reference = templates_source.reference
self.version = templates_source.version
self.path = templates_source.path / self.id
def get_all_references(self) -> List[str]:
"""Return all available references for the template."""
return self.templates_source.get_all_references(self.id)
def validate(self, skip_files):
"""Validate a template."""
for attribute in self.REQUIRED_ATTRIBUTES:
if not getattr(self, attribute, None):
raise errors.InvalidTemplateError(f"Template '{self.id}' does not have a '{attribute}' attribute")
for parameter in self.parameters:
parameter.validate()
if skip_files:
return
if not self.path.exists():
raise errors.InvalidTemplateError(f"Template directory for '{self.id}' does not exists")
# TODO: What are required files
required_files = self.REQUIRED_FILES
for file in required_files:
if not (self.path / file).is_file():
raise errors.InvalidTemplateError(f"File '{file}' is required for template '{self.id}'")
# NOTE: Validate symlinks resolve to a path inside the template
for relative_path in self.get_files():
try:
get_safe_relative_path(path=relative_path, base=self.path)
except ValueError:
raise errors.InvalidTemplateError(f"File '{relative_path}' is not within the template.")
def get_files(self) -> Generator[str, None, None]:
"""Return all files in a rendered renku template."""
for subpath in self.path.rglob("*"):
if subpath.is_file():
yield str(subpath.relative_to(self.path))
def render(self, metadata: "TemplateMetadata") -> "RenderedTemplate":
"""Render template files in a new directory."""
render_base = Path(tempfile.mkdtemp())
for relative_path in self.get_files():
# NOTE: The path could contain template variables, we need to template it
rendered_relative_path = jinja2.Template(relative_path).render(metadata.metadata)
destination = render_base / rendered_relative_path
destination.parent.mkdir(parents=True, exist_ok=True)
source = self.path / relative_path
try:
content = source.read_text()
except UnicodeDecodeError: # NOTE: Binary files
content = source.read_bytes()
destination.write_bytes(content)
else:
template = jinja2.Template(content, keep_trailing_newline=True)
rendered_content = template.render(metadata.metadata)
destination.write_text(rendered_content)
return RenderedTemplate(path=render_base, template=self, metadata=metadata.metadata)
class RenderedTemplate:
"""A rendered version of a Template."""
def __init__(self, path: Path, template: Template, metadata: Dict[str, Any]):
self.path: Path = path
self.template: Template = template
self.metadata: Dict[str, Any] = metadata
self.checksums: Dict[str, str] = {f: hash_file(self.path / f) for f in self.get_files()}
def get_files(self) -> Generator[str, None, None]:
"""Return all files in a rendered renku template."""
for subpath in self.path.rglob("*"):
if not subpath.is_file():
continue
relative_path = str(subpath.relative_to(self.path))
yield relative_path
class TemplateParameter:
"""Represent template variables."""
VALID_TYPES = ("string", "number", "boolean", "enum")
def __init__(
self,
name: str,
description: Optional[str],
type: Optional[str],
possible_values: Optional[List[Union[int, float, str, bool]]],
default: Optional[Union[int, float, str, bool]],
):
self.name: str = name
self.description: str = description or ""
self.type: Optional[str] = type
self.possible_values: List[Union[int, float, str, bool]] = possible_values or []
self.default = default
@classmethod
def from_dict(cls, name: str, value: Dict[str, Any]):
"""Create an instance from a dict."""
if not name:
raise errors.InvalidTemplateError(f"No name specified for template parameter '{value}'")
if not isinstance(value, dict):
raise errors.InvalidTemplateError(f"Invalid parameter type '{type(value).__name__}' for '{name}'")
return cls(
name=name,
type=value.get("type"),
description=value.get("description"),
possible_values=value.get("possible_values") or value.get("enum"),
default=value.get("default_value"),
)
@property
def has_default(self) -> bool:
"""Return True if a default value is set."""
# NOTE: ``None`` cannot be used as the default value but it's ok since no variable type accepts it and it's not
# a valid value anyways
return self.default is not None
def validate(self):
"""Validate manifest content."""
if not self.name:
raise errors.InvalidTemplateError("Template parameter does not have a name.")
if self.type and self.type not in self.VALID_TYPES:
raise errors.InvalidTemplateError(
f"Template contains variable '{self.name}' of type '{self.type}' which is not supported"
)
if self.possible_values and not isinstance(self.possible_values, list):
raise errors.InvalidTemplateError(
f"Invalid type for possible values of template variable '{self.name}': '{self.possible_values}'"
)
if self.type and self.type == "enum" and not self.possible_values:
raise errors.InvalidTemplateError(
f"Template variable '{self.name}' of type enum does not provide a corresponding enum list"
)
if self.has_default:
try:
self.default = self.convert(self.default)
except ValueError as e:
raise errors.InvalidTemplateError(f"Invalid default value for '{self.name}': {e}")
def convert(self, value: Union[int, float, str, bool]) -> Union[int, float, str, bool]:
"""Convert a given value to the proper type and raise if value is not valid."""
valid = True
if not self.type:
return value
elif self.type == "string":
if not isinstance(value, str):
valid = False
elif self.type == "number":
try:
value = int(str(value)) # NOTE: Convert to str first to avoid converting float to int if value is float
except ValueError:
try:
value = float(value)
except ValueError:
valid = False
elif self.type == "boolean":
true = (True, 1, "1", "true", "True")
false = (False, 0, "0", "false", "False")
if value not in true and value not in false:
valid = False
else:
value = True if value in true else False
elif self.type == "enum":
if value not in self.possible_values:
valid = False
if not valid:
value = f"{value} (type: {type(value).__name__})"
kind = f"type: {self.type}" if self.type else ""
possible_values = f"possible values: {self.possible_values}" if self.possible_values else ""
separator = ", " if kind and possible_values else ""
info = f" ({kind}{separator}{possible_values})" if kind or possible_values else ""
raise ValueError(f"Invalid value '{value}' for template variable '{self.name}{info}'")
return value
class TemplateMetadata:
"""Metadata required for rendering a template."""
def __init__(self, metadata: Dict[str, Any], immutable_files: List[str]):
self.metadata: Dict[str, Any] = metadata or {}
self.immutable_files: List[str] = immutable_files or []
@classmethod
def from_dict(cls, metadata: Dict[str, Any]) -> "TemplateMetadata":
"""Return an instance from a metadata dict."""
return cls(metadata=metadata, immutable_files=[])
@classmethod
def from_client(cls, client) -> "TemplateMetadata":
"""Return an instance from reading template-related metadata from a project."""
from renku.core.utils.metadata import get_renku_version
try:
project = client.project
except ValueError:
metadata = {}
immutable_files = []
else:
metadata = json.loads(project.template_metadata) if project.template_metadata else {}
# NOTE: Make sure project's template metadata is updated
metadata["__template_source__"] = project.template_source
metadata["__template_ref__"] = project.template_ref
metadata["__template_version__"] = project.template_version
metadata["__template_id__"] = project.template_id
# NOTE: Ignore Project.automated_update since it's default is False and won't allow any update at all
immutable_files = project.immutable_template_files
# NOTE: Always set __renku_version__ to the value read from the Dockerfile (if available) since setting/updating
# the template doesn't change project's metadata version and shouldn't update the Renku version either
renku_version = metadata.get("__renku_version__")
metadata["__renku_version__"] = get_renku_version(client) or renku_version or ""
return cls(metadata=metadata, immutable_files=immutable_files)
@property
def source(self):
"""Template source."""
return self.metadata.get("__template_source__")
@property
def reference(self):
"""Template reference."""
return self.metadata.get("__template_ref__")
@property
def version(self):
"""Template version."""
return self.metadata.get("__template_version__")
@property
def id(self):
"""Template id."""
return self.metadata.get("__template_id__")
@property
def allow_update(self) -> bool:
"""Is template updatable."""
return self.metadata.get("__automated_update__", True)
def update(self, template: Template):
"""Update metadata from a template."""
self.metadata["__template_source__"] = template.source
self.metadata["__template_ref__"] = template.reference
self.metadata["__template_version__"] = template.version
self.metadata["__template_id__"] = template.id
self.metadata["__automated_update__"] = template.allow_update
self.immutable_files = template.immutable_files