Rewrite dungeon to encapsulate filesystem access
This commit is contained in:
parent
f8faa29caa
commit
6b2f898d36
|
|
@ -2,110 +2,258 @@
|
|||
import os
|
||||
import logging
|
||||
import ast
|
||||
import importlib.util
|
||||
import time
|
||||
import random
|
||||
import traceback
|
||||
|
||||
|
||||
# Application imports
|
||||
from item import create_item
|
||||
|
||||
|
||||
# Globals
|
||||
logger = logging.getLogger("inquisitor.dungeon")
|
||||
|
||||
|
||||
class ReadableItem():
|
||||
"""
|
||||
An abstraction layer around items saved in dungeon cell folders.
|
||||
Provides read-only access with a deactivation function.
|
||||
If the underlying item is changed, those changes may be overwritten by deactivation.
|
||||
|
||||
Members:
|
||||
path: path to the wrapped item's file
|
||||
cell: name of the cell the item is in
|
||||
id: the item's id
|
||||
item: the wrapped item
|
||||
"""
|
||||
def __init__(self, dungeon_path, cell_name, item_id):
|
||||
self.path = os.path.join(dungeon_path, cell_name, item_id + ".item")
|
||||
self.cell = cell_name
|
||||
self.id = item_id
|
||||
logger.debug("Loading '{0.id}' from '{0.cell}'".format(self))
|
||||
with open(self.path, 'r', encoding='utf-8') as f:
|
||||
self.item = ast.literal_eval(f.read())
|
||||
|
||||
def __getitem__(self, key):
|
||||
return self.item[key]
|
||||
|
||||
def __setitem__(self, key, value):
|
||||
raise TypeError("ReadableItem is not writable")
|
||||
|
||||
def __contains__(self, key):
|
||||
return key in self.item
|
||||
|
||||
def __repr__(self):
|
||||
return "ReadableItem({0.cell}/{0.id})".format(self)
|
||||
|
||||
def __str__(self):
|
||||
return repr(self)
|
||||
|
||||
def deactivate(self):
|
||||
self.item['active'] = False
|
||||
logger.debug("Deactivating item at {0.path}".format(self))
|
||||
with open(self.path, 'w', encoding='utf-8') as f:
|
||||
f.write(str(self.item))
|
||||
|
||||
|
||||
class DungeonCell():
|
||||
"""
|
||||
An abstraction layer around a folder containing items generated by an item source.
|
||||
|
||||
Members:
|
||||
name: the cell's source's name
|
||||
dungeon_path: the path to the dungeon containing this cell
|
||||
path: the path to this cell
|
||||
state: the source's persistent state dictionary
|
||||
"""
|
||||
def __init__(self, dungeon_path, name):
|
||||
self.name = name
|
||||
self.dungeon_path = dungeon_path
|
||||
self.path = os.path.join(dungeon_path, name)
|
||||
state_path = os.path.join(self.path, "state")
|
||||
if not os.path.isdir(self.path):
|
||||
# Initialize cell state on the disk.
|
||||
logger.info("Creating folder for cell {}".format(name))
|
||||
os.mkdir(self.path)
|
||||
self.state = {}
|
||||
with open(state_path, 'w', encoding='utf-8') as f:
|
||||
f.write(str(self.state))
|
||||
else:
|
||||
# Load cell state from the disk.
|
||||
with open(state_path, 'r', encoding='utf-8') as f:
|
||||
self.state = ast.literal_eval(f.read())
|
||||
|
||||
def _item_path(key):
|
||||
return os.path.join(self.path, key + ".item")
|
||||
|
||||
def __getitem__(self, key):
|
||||
filepath = self._item_path(key)
|
||||
if not os.path.isfile(filepath):
|
||||
raise KeyError("No item '{}' in cell '{}'".format(key, self.name))
|
||||
return ReadableItem(self.dungeon_path, self.name, key)
|
||||
|
||||
def __setitem__(self, key, value):
|
||||
logger.info("Setting item {} in cell {}".format(key, self.name))
|
||||
if type(value) is ReadableItem:
|
||||
value = value.item
|
||||
if type(value) is not dict:
|
||||
raise TypeError("Can't store a '{}' as '{}': not a dict".format(type(value), key))
|
||||
filepath = self._item_path(key)
|
||||
with open(filepath, 'w', encoding='utf-8') as f:
|
||||
f.write(str(value))
|
||||
|
||||
def __delitem__(self, key):
|
||||
logger.info("Deleting item '{}' in cell '{}'".format(key, self.name))
|
||||
filepath = self._item_path(key)
|
||||
if os.path.isfile(filepath):
|
||||
os.remove(filepath)
|
||||
|
||||
def __contains__(self, key):
|
||||
for item in self:
|
||||
if item == key:
|
||||
return True
|
||||
return False
|
||||
|
||||
def __iter__(self):
|
||||
for filename in os.listdir(self.path):
|
||||
if filename.endswith(".item"):
|
||||
yield filename[:-5]
|
||||
|
||||
def save_state(self):
|
||||
filepath = os.path.join(self.path, 'state')
|
||||
with open(filepath, 'w', encoding='utf-8') as f:
|
||||
f.write(str(self.state))
|
||||
|
||||
def update_from_source(self, source, args):
|
||||
logger.info("Updating source {}".format(self.name))
|
||||
# Get the ids of the existing items.
|
||||
prior_item_ids = [item_id for item_id in self]
|
||||
# Get the new items.
|
||||
new_items = itemsource.fetch_new(state, args)
|
||||
self.save_state()
|
||||
new_count = del_count = 0
|
||||
for item in new_items:
|
||||
# Store new items unconditionally.
|
||||
if item['id'] not in prior_item_ids:
|
||||
new_count += 1
|
||||
self[item['id']] = item
|
||||
# Update extant items if active, otherwise inactive items will be
|
||||
# reactivated by the overwrite.
|
||||
else:
|
||||
prior_item = self[item['id']]
|
||||
if prior_item['active']:
|
||||
self[item['id']] = item
|
||||
# Remove the id from the list to track its continued presence
|
||||
# in the source's queue of new items.
|
||||
prior_item_ids.remove(item['id'])
|
||||
# Any extant item left in the list is old. Remove any items that are
|
||||
# both old and inactive.
|
||||
for prior_id in prior_item_ids:
|
||||
if not self[prior_id]['active']:
|
||||
del_count += 1
|
||||
del self[prior_id]
|
||||
# Return counts
|
||||
return new_count, del_count
|
||||
|
||||
|
||||
class Dungeon():
|
||||
"""
|
||||
A wrapper for dealing with a collection of DungeonCell folders.
|
||||
Interfaces between Inquisitor and the ReadableItems produced by its
|
||||
sources.
|
||||
"""
|
||||
def __init__(self, path):
|
||||
"""
|
||||
Serves as an interface between Inquisitor and a folder of
|
||||
serialized readable items.
|
||||
"""
|
||||
self.path = path
|
||||
self.log = logging.getLogger("inquisitor.dungeon")
|
||||
|
||||
def load_path(self, path):
|
||||
self.log.debug("Loading item from {}".format(path))
|
||||
with open(path, 'r', encoding='utf-8') as f:
|
||||
item = ast.literal_eval(f.read())
|
||||
return item
|
||||
|
||||
def load_item(self, source, itemid):
|
||||
item_path = os.path.join(self.path, source, itemid + ".item")
|
||||
return self.load_path(item_path)
|
||||
|
||||
def save_item(self, item):
|
||||
path = os.path.join(self.path, item['source'], item['id'] + ".item")
|
||||
self.log.debug("Saving item {} to {}".format(item['id'], path))
|
||||
with open(path, 'w', encoding='utf-8') as f:
|
||||
f.write(str(item))
|
||||
|
||||
def update(self, itemsource):
|
||||
"""
|
||||
Fetches items from the given source, saves new active items,
|
||||
and clears out old inactive items.
|
||||
"""
|
||||
new_items = 0
|
||||
self.log.info("Updating source {}".format(itemsource.SOURCE))
|
||||
# Check if the source has a folder.
|
||||
source_folder = os.path.join(self.path, itemsource.SOURCE)
|
||||
source_state = os.path.join(source_folder, "state")
|
||||
if not os.path.isdir(source_folder):
|
||||
self.log.info("Creating folder {}".format(source_folder))
|
||||
os.mkdir(source_folder)
|
||||
# Initialize persistent state.
|
||||
with open(source_state, 'w') as f:
|
||||
f.write("{}")
|
||||
# Load source persistent state.
|
||||
state = self.load_path(source_state)
|
||||
# Any inactive items that no longer show up as new should be
|
||||
# removed. Track which items to check for inactivity.
|
||||
extant_items_to_check = [
|
||||
filename
|
||||
for filename in os.listdir(source_folder)
|
||||
if filename.endswith(".item")]
|
||||
# Get the new items from the source.
|
||||
source_items = itemsource.fetch_new(state)
|
||||
with open(source_state, 'w', encoding='utf-8') as f:
|
||||
f.write(str(state))
|
||||
for source_item in source_items:
|
||||
file_path = os.path.join(source_folder, source_item['id'] + ".item")
|
||||
if os.path.isfile(file_path):
|
||||
# Still-new items are exempt from activity checks.
|
||||
extant_items_to_check.remove(source_item['id'] + ".item")
|
||||
item = self.load_path(file_path)
|
||||
if not item['active']:
|
||||
# Don't reactivate inactive items.
|
||||
# Initialize DungeonCells for each folder with a state file
|
||||
self.cells = {}
|
||||
for filename in os.listdir(self.path):
|
||||
if not os.path.isdir(os.path.join(self.path, filename)):
|
||||
continue
|
||||
else:
|
||||
new_items += 1
|
||||
# Add new items and update active ones.
|
||||
self.save_item(source_item)
|
||||
# Check old items for inactivity.
|
||||
for extant_item_filename in extant_items_to_check:
|
||||
file_path = os.path.join(source_folder, extant_item_filename)
|
||||
item = self.load_path(file_path)
|
||||
if not item['active']:
|
||||
# Remove old inactive items.
|
||||
self.log.info("Deleting {}".format(file_path))
|
||||
os.remove(file_path)
|
||||
return new_items
|
||||
|
||||
def get_active_items(self):
|
||||
source_folders = os.listdir(self.path)
|
||||
items = []
|
||||
for source_folder_name in source_folders:
|
||||
items.extend(self.get_active_items_for_folder(source_folder_name))
|
||||
return items
|
||||
|
||||
def get_active_items_for_folder(self, source):
|
||||
source_folder = os.path.join(self.path, source)
|
||||
item_filenames = os.listdir(source_folder)
|
||||
items = []
|
||||
for item_filename in item_filenames:
|
||||
if not item_filename.endswith(".item"):
|
||||
if not os.path.isfile(os.path.join(self.path, filename, 'status')):
|
||||
continue
|
||||
file_path = os.path.join(source_folder, item_filename)
|
||||
item = self.load_path(file_path)
|
||||
if item['active']:
|
||||
items.append(item)
|
||||
return items
|
||||
self.cells[filename] = DungeonCell(self.path, filename)
|
||||
# Ensure Inquisitor's source is present
|
||||
if "inquisitor" not in self.cells:
|
||||
self.cells["inquisitor"] = DungeonCell(self.path, 'inquisitor')
|
||||
|
||||
def deactivate_item(self, source, itemid):
|
||||
item_path = os.path.join(self.path, source, itemid + ".item")
|
||||
if not os.path.isfile(item_path):
|
||||
self.log.error("No item found: {}".format(item_path))
|
||||
def __getitem__(self, key):
|
||||
return self.cells[key]
|
||||
|
||||
def __setitem__(self, key, value):
|
||||
if type(value) is not DungeonCell:
|
||||
raise TypeError("Can't store a '{}' as '{}': not a DungeonCell".format(type(value), key))
|
||||
self.cells[key] = value
|
||||
|
||||
def __contains__(self, key):
|
||||
return key in self.cells
|
||||
|
||||
def __iter__(self):
|
||||
for name in self.cells:
|
||||
yield name
|
||||
|
||||
def push_error_item(self, title, body=None):
|
||||
logger.error(title)
|
||||
item = create_item(
|
||||
'inquisitor',
|
||||
'{:x}'.format(random.getrandbits(16 * 4)),
|
||||
title,
|
||||
body="<pre>{}</pre>".format(body) if body else None)
|
||||
self['inquisitor'][item['id']] = item
|
||||
|
||||
def try_load_source(self, sources_path, source_name):
|
||||
"""
|
||||
Tries to load the given source, creating a cell in the dungeon if
|
||||
necessary. Returns the source and its DungeonCell if the source is
|
||||
valid and None, None otherwise.
|
||||
"""
|
||||
# Check if the named source is present in the sources directory.
|
||||
source_file_path = os.path.join(sources_path, source_name + ".py")
|
||||
if not os.path.isfile(source_file_path):
|
||||
msg = "Could not find source '{}'".format(source_name)
|
||||
self.push_error_item(msg)
|
||||
return None, None
|
||||
# Try to import the source module.
|
||||
try:
|
||||
logger.debug("Loading module {}".format(source_file_path))
|
||||
spec = importlib.util.spec_from_file_location("itemsource", source_file_path)
|
||||
itemsource = importlib.util.module_from_spec(spec)
|
||||
spec.loader.exec_module(itemsource)
|
||||
if not hasattr(itemsource, 'fetch_new'):
|
||||
raise ImportError("fetch_new missing")
|
||||
except Exception:
|
||||
msg = "Error importing source '{}'".format(source_name)
|
||||
self.push_error_item(msg, traceback.format_exc())
|
||||
return None, None
|
||||
# Since the source is valid, get or create the source cell.
|
||||
if source_name not in self:
|
||||
self[source_name] = DungeonCell(self.path, source_name)
|
||||
|
||||
return itemsource, self[source_name]
|
||||
|
||||
def update(self, source_arg, args):
|
||||
"""
|
||||
Loads the given source and fetches new items. Clears old and inactive items.
|
||||
"""
|
||||
# Split off the source name from the fetch argument.
|
||||
splits = source_arg.split(":", maxsplit=1)
|
||||
source_name = splits[0]
|
||||
source_args = splits[1] if len(splits) > 1 else None
|
||||
|
||||
# Load the source.
|
||||
source, cell = self.try_load_source(args.srcdir, source_name)
|
||||
if source is None or cell is None:
|
||||
# try_load_source has already logged the error
|
||||
return
|
||||
|
||||
# Update the cell from the source.
|
||||
try:
|
||||
new_count, deleted_count = cell.update_from_source(source, source_args)
|
||||
logger.info("{} new item{}, {} deleted item{}".format(
|
||||
new_count, "s" if new_count != 1 else "",
|
||||
deleted_count, "s" if deleted_count != 1 else ""))
|
||||
except:
|
||||
msg = "Error fetching items from source '{}'".format(source_name)
|
||||
self.push_error_item(msg, traceback.format_exc())
|
||||
return
|
||||
item = self.load_path(item_path)
|
||||
item['active'] = False
|
||||
self.save_item(item)
|
||||
return item
|
||||
|
|
|
|||
|
|
@ -0,0 +1,28 @@
|
|||
# Standard library imports
|
||||
import importlib.util
|
||||
import os
|
||||
import logging
|
||||
import time
|
||||
|
||||
|
||||
# Globals
|
||||
logger = logging.getLogger("inquisitor.item")
|
||||
|
||||
|
||||
def create_item(source, item_id, title, link=None, time=None, author=None, body=None):
|
||||
item = {
|
||||
'id': item_id,
|
||||
'source': source,
|
||||
'active': True,
|
||||
'created': time.time(),
|
||||
'title': title,
|
||||
}
|
||||
if link is not None:
|
||||
item['link'] = link
|
||||
if time is not None:
|
||||
item['time'] = time
|
||||
if author is not None:
|
||||
item['author'] = author
|
||||
if body is not None:
|
||||
item['body'] = body
|
||||
return item
|
||||
Loading…
Reference in New Issue