Warning
This document is for an in-development version of Galaxy. You can alternatively view this page in the latest release if it exists or view the top of the latest release's documentation.
Source code for galaxy.tools.cache
import logging
import os
from threading import Lock
from typing import (
Optional,
TYPE_CHECKING,
Union,
)
from galaxy.util import unicodify
from galaxy.util.hash_util import md5_hash_file
if TYPE_CHECKING:
from galaxy.tools import Tool
from galaxy.util.path import StrPath
log = logging.getLogger(__name__)
[docs]
class ToolCache:
"""
Cache tool definitions to allow quickly reloading the whole
toolbox.
"""
[docs]
def __init__(self) -> None:
self._lock = Lock()
self._hash_by_tool_paths: dict[str, ToolHash] = {}
self._tools_by_path: dict[str, Tool] = {}
self._tool_paths_by_id: dict[str, StrPath] = {}
self._new_tool_ids: set[str] = set()
self._removed_tool_ids: set[str] = set()
self._removed_tools_by_path: dict[str, Tool] = {}
self._hashes_initialized = False
[docs]
def assert_hashes_initialized(self) -> None:
if not self._hashes_initialized:
for tool_hash in self._hash_by_tool_paths.values():
tool_hash.hash # noqa: B018
self._hashes_initialized = True
[docs]
def cleanup(self) -> list[str]:
"""
Remove uninstalled tools from tool cache if they are not on disk anymore or if their content has changed.
Returns list of tool_ids that have been removed.
"""
removed_tool_ids: list[str] = []
try:
with self._lock:
paths_to_cleanup = {
(path, tool) for path, tool in self._tools_by_path.items() if self._should_cleanup(path)
}
for config_filename, tool in paths_to_cleanup:
del self._hash_by_tool_paths[config_filename]
if os.path.exists(config_filename):
# This tool has probably been broken while editing on disk
# We record it here, so that we can recover it
self._removed_tools_by_path[config_filename] = self._tools_by_path[config_filename]
del self._tools_by_path[config_filename]
tool_ids = tool.all_ids
for tool_id in tool_ids:
if tool_id in self._tool_paths_by_id:
del self._tool_paths_by_id[tool_id]
removed_tool_ids.extend(tool_ids)
for tool_id in removed_tool_ids:
self._removed_tool_ids.add(tool_id)
if tool_id in self._new_tool_ids:
self._new_tool_ids.remove(tool_id)
except Exception as e:
log.debug("Exception while checking tools to remove from cache: %s", unicodify(e))
# If by chance the file is being removed while calculating the hash or modtime
# we don't want the thread to die.
if removed_tool_ids:
log.debug(f"Removed the following tools from cache: {removed_tool_ids}")
return removed_tool_ids
def _should_cleanup(self, config_filename: str) -> bool:
"""Return True if `config_filename` does not exist or if modtime and hash have changes, else return False."""
try:
new_mtime = os.path.getmtime(config_filename)
tool_hash = self._hash_by_tool_paths.get(config_filename)
if tool_hash and tool_hash.modtime < new_mtime:
if not tool_hash.hash == md5_hash_file(config_filename):
return True
else:
# No change of content, so not necessary to calculate the md5 checksum every time
tool_hash.modtime = new_mtime
tool = self._tools_by_path[config_filename]
for macro_path in tool._macro_paths:
new_mtime = os.path.getmtime(macro_path)
if (macro_hash := self._hash_by_tool_paths.get(str(macro_path))) and macro_hash.modtime < new_mtime:
return True
except FileNotFoundError:
return True
return False
[docs]
def get_tool(self, config_filename: "StrPath") -> Union["Tool", None]:
"""Get the tool at `config_filename` from the cache if the tool is up to date."""
return self._tools_by_path.get(str(config_filename))
[docs]
def get_removed_tool(self, config_filename: "StrPath") -> Union["Tool", None]:
return self._removed_tools_by_path.get(str(config_filename))
[docs]
def get_tool_by_id(self, tool_id: str) -> Union["Tool", None]:
"""Get the tool with the id `tool_id` from the cache if the tool is up to date."""
if tool_path := self._tool_paths_by_id.get(tool_id):
return self.get_tool(tool_path)
return None
[docs]
def expire_tool(self, tool_id: str) -> None:
with self._lock:
if tool_id in self._tool_paths_by_id:
config_filename = str(self._tool_paths_by_id[tool_id])
del self._hash_by_tool_paths[config_filename]
del self._tool_paths_by_id[tool_id]
del self._tools_by_path[config_filename]
if tool_id in self._new_tool_ids:
self._new_tool_ids.remove(tool_id)
[docs]
def cache_tool(self, config_filename: "StrPath", tool: "Tool") -> None:
tool_id = str(tool.id)
# We defer hashing of the config file if we haven't called assert_hashes_initialized.
# This allows startup to occur without having to read in and hash all tool and macro files
lazy_hash = not self._hashes_initialized
with self._lock:
self._hash_by_tool_paths[str(config_filename)] = ToolHash(config_filename, lazy_hash=lazy_hash)
self._tool_paths_by_id[tool_id] = config_filename
self._tools_by_path[str(config_filename)] = tool
self._new_tool_ids.add(tool_id)
for macro_path in tool._macro_paths:
self._hash_by_tool_paths[str(macro_path)] = ToolHash(macro_path, lazy_hash=lazy_hash)
[docs]
def reset_status(self) -> None:
"""
Reset tracking of new and newly disabled tools.
"""
with self._lock:
self._new_tool_ids = set()
self._removed_tool_ids = set()
self._removed_tools_by_path = {}
[docs]
class ToolHash:
[docs]
def __init__(self, path: "StrPath", modtime: Optional[float] = None, lazy_hash: bool = False) -> None:
self.path = path
self.modtime = modtime or os.path.getmtime(path)
self._tool_hash: Optional[str] = None
if not lazy_hash:
self.hash # noqa: B018
@property
def hash(self) -> Union[str, None]:
if self._tool_hash is None:
self._tool_hash = md5_hash_file(self.path)
return self._tool_hash