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Source code for galaxy.model.tags

import logging
import re

from sqlalchemy.sql import select
from sqlalchemy.sql.expression import func

import galaxy.model
from galaxy.util import (

log = logging.getLogger(__name__)

# Item-specific information needed to perform tagging.
[docs]class ItemTagAssocInfo:
[docs] def __init__(self, item_class, tag_assoc_class, item_id_col): self.item_class = item_class self.tag_assoc_class = tag_assoc_class self.item_id_col = item_id_col
[docs]class TagHandler: """ Manages CRUD operations related to tagging objects. """
[docs] def __init__(self, sa_session): self.sa_session = sa_session # Minimum tag length. self.min_tag_len = 1 # Maximum tag length. self.max_tag_len = 255 # Tag separator. self.tag_separators = ',;' # Hierarchy separator. self.hierarchy_separator = '.' # Key-value separator. self.key_value_separators = "=:" # Initialize with known classes - add to this in subclasses. self.item_tag_assoc_info = {}
[docs] def create_tag_handler_session(self): # Creates a transient tag handler that avoids repeated flushes return GalaxyTagHandlerSession(self.sa_session)
[docs] def add_tags_from_list(self, user, item, new_tags_list, flush=True): new_tags_set = set(new_tags_list) if item.tags: new_tags_set.update(self.get_tags_str(item.tags).split(',')) return self.set_tags_from_list(user, item, new_tags_set, flush=flush)
[docs] def remove_tags_from_list(self, user, item, tag_to_remove_list, flush=True): tag_to_remove_set = set(tag_to_remove_list) tags_set = {_.strip() for _ in self.get_tags_str(item.tags).split(',')} if item.tags: tags_set -= tag_to_remove_set return self.set_tags_from_list(user, item, tags_set, flush=flush)
[docs] def set_tags_from_list(self, user, item, new_tags_list, flush=True): # precondition: item is already security checked against user # precondition: incoming tags is a list of sanitized/formatted strings self.delete_item_tags(user, item) new_tags_str = ','.join(new_tags_list) self.apply_item_tags(user, item, unicodify(new_tags_str, 'utf-8'), flush=flush) if flush: self.sa_session.flush() return item.tags
[docs] def get_tag_assoc_class(self, item_class): """Returns tag association class for item class.""" return self.item_tag_assoc_info[item_class.__name__].tag_assoc_class
[docs] def get_id_col_in_item_tag_assoc_table(self, item_class): """Returns item id column in class' item-tag association table.""" return self.item_tag_assoc_info[item_class.__name__].item_id_col
[docs] def get_community_tags(self, item=None, limit=None): """Returns community tags for an item.""" # Get item-tag association class. item_class = item.__class__ item_tag_assoc_class = self.get_tag_assoc_class(item_class) if not item_tag_assoc_class: return [] # Build select statement. cols_to_select = [item_tag_assoc_class.table.c.tag_id, func.count('*')] from_obj = item_tag_assoc_class.table.join(item_class.table).join(galaxy.model.Tag.table) where_clause = (self.get_id_col_in_item_tag_assoc_table(item_class) == item.id) order_by = [func.count("*").desc()] group_by = item_tag_assoc_class.table.c.tag_id # Do query and get result set. query = select(columns=cols_to_select, from_obj=from_obj, whereclause=where_clause, group_by=group_by, order_by=order_by, limit=limit) result_set = self.sa_session.execute(query) # Return community tags. community_tags = [] for row in result_set: tag_id = row[0] community_tags.append(self.get_tag_by_id(tag_id)) return community_tags
[docs] def get_tool_tags(self): query = select(columns=[galaxy.model.ToolTagAssociation.table.c.tag_id], from_obj=galaxy.model.ToolTagAssociation.table).distinct() result_set = self.sa_session.execute(query) tags = [] for row in result_set: tag_id = row[0] tags.append(self.get_tag_by_id(tag_id)) return tags
[docs] def remove_item_tag(self, user, item, tag_name): """Remove a tag from an item.""" # Get item tag association. item_tag_assoc = self._get_item_tag_assoc(user, item, tag_name) # Remove association. if item_tag_assoc: # Delete association. self.sa_session.delete(item_tag_assoc) item.tags.remove(item_tag_assoc) return True return False
[docs] def delete_item_tags(self, user, item): """Delete tags from an item.""" # Delete item-tag associations. for tag in item.tags: if tag.id: # Only can and need to delete tag if tag is persisted self.sa_session.delete(tag) # Delete tags from item. del item.tags[:]
[docs] def item_has_tag(self, user, item, tag): """Returns true if item is has a given tag.""" # Get tag name. if isinstance(tag, str): tag_name = tag elif isinstance(tag, galaxy.model.Tag): tag_name = tag.name elif isinstance(tag, galaxy.model.ItemTagAssociation): tag_name = tag.user_tname # Check for an item-tag association to see if item has a given tag. item_tag_assoc = self._get_item_tag_assoc(user, item, tag_name) if item_tag_assoc: return True return False
[docs] def apply_item_tag(self, user, item, name, value=None, flush=True): # Use lowercase name for searching/creating tag. lc_name = name.lower() # Get or create item-tag association. item_tag_assoc = self._get_item_tag_assoc(user, item, lc_name) # If the association does not exist, or if it has a different value, add another. # We do allow multiple associations with different values. if not item_tag_assoc or (item_tag_assoc and item_tag_assoc.value != value): # Create item-tag association. # Create tag; if None, skip the tag (and log error). tag = self._get_or_create_tag(lc_name) if not tag: log.warning("Failed to create tag with name %s" % lc_name) return # Create tag association based on item class. item_tag_assoc_class = self.get_tag_assoc_class(item.__class__) item_tag_assoc = item_tag_assoc_class() # Add tag to association. item.tags.append(item_tag_assoc) item_tag_assoc.tag = tag item_tag_assoc.user = user # Apply attributes to item-tag association. Strip whitespace from user name and tag. lc_value = None if value: lc_value = value.lower() item_tag_assoc.user_tname = name item_tag_assoc.user_value = value item_tag_assoc.value = lc_value if flush: self.sa_session.flush() return item_tag_assoc
[docs] def apply_item_tags(self, user, item, tags_str, flush=True): """Apply tags to an item.""" # Parse tags. parsed_tags = self.parse_tags(tags_str) # Apply each tag. for name, value in parsed_tags: self.apply_item_tag(user, item, name, value, flush=flush)
[docs] def get_tags_str(self, tags): """Build a string from an item's tags.""" # Return empty string if there are no tags. if not tags: return "" # Create string of tags. tags_str_list = list() for tag in tags: tag_str = tag.user_tname if tag.value is not None: tag_str += ":" + tag.user_value tags_str_list.append(tag_str) return ", ".join(tags_str_list)
[docs] def get_tag_by_id(self, tag_id): """Get a Tag object from a tag id.""" return self.sa_session.query(galaxy.model.Tag).filter_by(id=tag_id).first()
[docs] def get_tag_by_name(self, tag_name): """Get a Tag object from a tag name (string).""" if tag_name: return self.sa_session.query(galaxy.model.Tag).filter_by(name=tag_name.lower()).first() return None
def _create_tag(self, tag_str): """Create a Tag object from a tag string.""" tag_hierarchy = tag_str.split(self.hierarchy_separator) tag_prefix = "" parent_tag = None for sub_tag in tag_hierarchy: # Get or create subtag. tag_name = tag_prefix + self._scrub_tag_name(sub_tag) tag = self._get_tag(tag_name) if not tag: tag = self._create_tag_instance(tag_name) # Set tag parent. tag.parent = parent_tag # Update parent and tag prefix. parent_tag = tag tag_prefix = tag.name + self.hierarchy_separator return tag def _get_tag(self, tag_name): return self.sa_session.query(galaxy.model.Tag).filter_by(name=tag_name).first() def _create_tag_instance(self, tag_name): return galaxy.model.Tag(type=0, name=tag_name) def _get_or_create_tag(self, tag_str): """Get or create a Tag object from a tag string.""" # Scrub tag; if tag is None after being scrubbed, return None. scrubbed_tag_str = self._scrub_tag_name(tag_str) if not scrubbed_tag_str: return None # Get item tag. tag = self.get_tag_by_name(scrubbed_tag_str) # Create tag if necessary. if tag is None: tag = self._create_tag(scrubbed_tag_str) return tag def _get_item_tag_assoc(self, user, item, tag_name): """ Return ItemTagAssociation object for a user, item, and tag string; returns None if there is no such association. """ scrubbed_tag_name = self._scrub_tag_name(tag_name) for item_tag_assoc in item.tags: if (item_tag_assoc.user == user) and (item_tag_assoc.user_tname == scrubbed_tag_name): return item_tag_assoc return None
[docs] def parse_tags(self, tag_str): """ Return a list of tag tuples (name, value) pairs derived from a string. >>> th = TagHandler("bridge_of_death") >>> assert th.parse_tags("#ARTHUR") == [('name', 'ARTHUR')] >>> tags = th.parse_tags("name:Lancelot of Camelot;#Holy Grail;blue") >>> assert tags == [('name', 'LancelotofCamelot'), ('name', 'HolyGrail'), ('blue', None)] """ # Gracefully handle None. if not tag_str: return dict() # Strip unicode control characters tag_str = strip_control_characters(tag_str) # Split tags based on separators. reg_exp = re.compile('[' + self.tag_separators + ']') raw_tags = reg_exp.split(tag_str) return self.parse_tags_list(raw_tags)
[docs] def parse_tags_list(self, tags_list): """ Return a list of tag tuples (name, value) pairs derived from a list. Method scrubs tag names and values as well. >>> th = TagHandler("bridge_of_death") >>> tags = th.parse_tags_list(["name:Lancelot of Camelot", "#Holy Grail", "blue"]) >>> assert tags == [('name', 'LancelotofCamelot'), ('name', 'HolyGrail'), ('blue', None)] """ name_value_pairs = [] for raw_tag in tags_list: nv_pair = self._get_name_value_pair(raw_tag) scrubbed_name = self._scrub_tag_name(nv_pair[0]) scrubbed_value = self._scrub_tag_value(nv_pair[1]) # Append tag_name, tag_value tuple -- TODO use NamedTuple name_value_pairs.append((scrubbed_name, scrubbed_value)) return name_value_pairs
def _scrub_tag_value(self, value): """Scrub a tag value.""" # Gracefully handle None: if not value: return None # Remove whitespace from value. reg_exp = re.compile(r'\s') scrubbed_value = re.sub(reg_exp, "", value) return scrubbed_value def _scrub_tag_name(self, name): """Scrub a tag name.""" # Gracefully handle None: if not name: return None # Remove whitespace from name. reg_exp = re.compile(r'\s') scrubbed_name = re.sub(reg_exp, "", name) # Ignore starting ':' char. if scrubbed_name.startswith(self.hierarchy_separator): scrubbed_name = scrubbed_name[1:] # If name is too short or too long, return None. if len(scrubbed_name) < self.min_tag_len or len(scrubbed_name) > self.max_tag_len: return None return scrubbed_name def _scrub_tag_name_list(self, tag_name_list): """Scrub a tag name list.""" scrubbed_tag_list = list() for tag in tag_name_list: scrubbed_tag_list.append(self._scrub_tag_name(tag)) return scrubbed_tag_list def _get_name_value_pair(self, tag_str): """Get name, value pair from a tag string.""" # Use regular expression to parse name, value. if tag_str.startswith('#'): tag_str = "name:%s" % tag_str[1:] reg_exp = re.compile("[" + self.key_value_separators + "]") name_value_pair = reg_exp.split(tag_str, 1) # Add empty slot if tag does not have value. if len(name_value_pair) < 2: name_value_pair.append(None) return name_value_pair
[docs]class GalaxyTagHandler(TagHandler):
[docs] def __init__(self, sa_session): from galaxy import model TagHandler.__init__(self, sa_session) self.item_tag_assoc_info["History"] = ItemTagAssocInfo(model.History, model.HistoryTagAssociation, model.HistoryTagAssociation.table.c.history_id) self.item_tag_assoc_info["HistoryDatasetAssociation"] = \ ItemTagAssocInfo(model.HistoryDatasetAssociation, model.HistoryDatasetAssociationTagAssociation, model.HistoryDatasetAssociationTagAssociation.table.c.history_dataset_association_id) self.item_tag_assoc_info["HistoryDatasetCollectionAssociation"] = \ ItemTagAssocInfo(model.HistoryDatasetCollectionAssociation, model.HistoryDatasetCollectionTagAssociation, model.HistoryDatasetCollectionTagAssociation.table.c.history_dataset_collection_id) self.item_tag_assoc_info["LibraryDatasetDatasetAssociation"] = \ ItemTagAssocInfo(model.LibraryDatasetDatasetAssociation, model.LibraryDatasetDatasetAssociationTagAssociation, model.LibraryDatasetDatasetAssociationTagAssociation.table.c.library_dataset_dataset_association_id) self.item_tag_assoc_info["Page"] = ItemTagAssocInfo(model.Page, model.PageTagAssociation, model.PageTagAssociation.table.c.page_id) self.item_tag_assoc_info["StoredWorkflow"] = ItemTagAssocInfo(model.StoredWorkflow, model.StoredWorkflowTagAssociation, model.StoredWorkflowTagAssociation.table.c.stored_workflow_id) self.item_tag_assoc_info["Visualization"] = ItemTagAssocInfo(model.Visualization, model.VisualizationTagAssociation, model.VisualizationTagAssociation.table.c.visualization_id)
[docs]class GalaxyTagHandlerSession(GalaxyTagHandler): """Like GalaxyTagHandler, but avoids one flush per created tag."""
[docs] def __init__(self, sa_session): super().__init__(sa_session) self.created_tags = {}
def _get_tag(self, tag_name): """Get tag from cache or database.""" # Avoids creating multiple new tags with the same tag_name, which violates unique key constraint return self.created_tags.get(tag_name) or super(GalaxyTagHandler, self)._get_tag(tag_name) def _create_tag_instance(self, tag_name): """Create tag and and store in cache.""" tag = super()._create_tag_instance(tag_name) self.created_tags[tag_name] = tag return tag
[docs]class CommunityTagHandler(TagHandler):
[docs] def __init__(self, sa_session): TagHandler.__init__(self, sa_session)