mirror of
https://github.com/galaxyproject/galaxy.git
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109 lines
4.3 KiB
Python
109 lines
4.3 KiB
Python
import configparser
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import logging
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import os
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import shutil
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import threading
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from datetime import date
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from galaxy.util import unicodify
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log = logging.getLogger(__name__)
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new_hgweb_config_template = """
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[paths]
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"""
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class HgWebConfigManager:
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def __init__(self):
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self.hgweb_config_dir = None
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self.in_memory_config = None
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def add_entry(self, lhs, rhs):
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"""Add an entry in the hgweb.config file for a new repository."""
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lock = threading.Lock()
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lock.acquire(True)
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try:
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# Since we're changing the config, make sure the latest is loaded into memory.
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self.read_config(force_read=True)
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# An entry looks something like: repos/test/mira_assembler = database/community_files/000/repo_123.
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if rhs.startswith("./"):
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rhs = rhs.replace("./", "", 1)
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self.make_backup()
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# Add the new entry into memory.
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self.in_memory_config.set("paths", lhs, rhs)
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# Persist our in-memory configuration.
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self.write_config()
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except Exception as e:
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log.debug("Exception in HgWebConfigManager.add_entry(): %s", unicodify(e))
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finally:
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lock.release()
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def change_entry(self, old_lhs, new_lhs, new_rhs):
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"""Change an entry in the hgweb.config file for a repository - this only happens when the owner changes the name of the repository."""
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lock = threading.Lock()
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lock.acquire(True)
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try:
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self.make_backup()
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# Remove the old entry.
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self.in_memory_config.remove_option("paths", old_lhs)
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# Add the new entry.
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self.in_memory_config.set("paths", new_lhs, new_rhs)
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# Persist our in-memory configuration.
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self.write_config()
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except Exception as e:
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log.debug("Exception in HgWebConfigManager.change_entry(): %s", unicodify(e))
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finally:
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lock.release()
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def get_entry(self, lhs):
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"""Return an entry in the hgweb.config file for a repository"""
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self.read_config()
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try:
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entry = self.in_memory_config.get("paths", lhs)
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except configparser.NoOptionError:
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try:
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# We have a multi-threaded front-end, so one of the threads may not have the latest version of the hgweb.config file.
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self.read_config(force_read=True)
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entry = self.in_memory_config.get("paths", lhs)
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except configparser.NoOptionError:
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raise Exception(f"Entry for repository {lhs} missing in file {self.hgweb_config}.")
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return entry
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@property
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def hgweb_config(self):
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hgweb_config = os.path.join(self.hgweb_config_dir, "hgweb.config")
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if not os.path.exists(hgweb_config):
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# We used to raise an exception here...
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# raise Exception( "Required file %s does not exist - check config setting for hgweb_config_dir." % hgweb_config )
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# ...but now we just log the missing file and create a new empty one.
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log.debug(
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f"Required file {hgweb_config} does not exist, so creating a new, empty file. Check your config setting for hgweb_config_dir."
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)
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with open(hgweb_config, "w") as hgweb_config_file:
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hgweb_config_file.write(new_hgweb_config_template)
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return os.path.abspath(hgweb_config)
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def make_backup(self):
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# Make a backup of the hgweb.config file.
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today = date.today()
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backup_date = today.strftime("%Y_%m_%d")
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hgweb_config_backup_filename = f"hgweb.config_{backup_date}_backup"
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hgweb_config_copy = os.path.join(self.hgweb_config_dir, hgweb_config_backup_filename)
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shutil.copy(os.path.abspath(self.hgweb_config), os.path.abspath(hgweb_config_copy))
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def read_config(self, force_read=False):
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if force_read or self.in_memory_config is None:
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config = configparser.ConfigParser()
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config.read(self.hgweb_config)
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self.in_memory_config = config
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def write_config(self):
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"""Writing the in-memory configuration to the hgweb.config file on disk."""
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with open(self.hgweb_config, "w") as config_file:
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self.in_memory_config.write(config_file)
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hgweb_config_manager = HgWebConfigManager()
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