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""" History related magics and functionality """
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import atexit
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import datetime
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from pathlib import Path
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import re
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import sqlite3
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import threading
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from traitlets.config.configurable import LoggingConfigurable
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from decorator import decorator
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from IPython.utils.decorators import undoc
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from IPython.paths import locate_profile
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from traitlets import (
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Any,
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Bool,
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Dict,
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Instance,
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Integer,
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List,
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Unicode,
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Union,
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TraitError,
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default,
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observe,
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)
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#-----------------------------------------------------------------------------
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# Classes and functions
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#-----------------------------------------------------------------------------
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@undoc
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class DummyDB(object):
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"""Dummy DB that will act as a black hole for history.
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Only used in the absence of sqlite"""
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def execute(*args, **kwargs):
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return []
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def commit(self, *args, **kwargs):
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pass
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def __enter__(self, *args, **kwargs):
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pass
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def __exit__(self, *args, **kwargs):
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pass
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@decorator
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def only_when_enabled(f, self, *a, **kw):
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"""Decorator: return an empty list in the absence of sqlite."""
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if not self.enabled:
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return []
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else:
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return f(self, *a, **kw)
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# use 16kB as threshold for whether a corrupt history db should be saved
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# that should be at least 100 entries or so
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_SAVE_DB_SIZE = 16384
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@decorator
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def catch_corrupt_db(f, self, *a, **kw):
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"""A decorator which wraps HistoryAccessor method calls to catch errors from
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a corrupt SQLite database, move the old database out of the way, and create
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a new one.
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We avoid clobbering larger databases because this may be triggered due to filesystem issues,
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not just a corrupt file.
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"""
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try:
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return f(self, *a, **kw)
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except (sqlite3.DatabaseError, sqlite3.OperationalError) as e:
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self._corrupt_db_counter += 1
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self.log.error("Failed to open SQLite history %s (%s).", self.hist_file, e)
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if self.hist_file != ':memory:':
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if self._corrupt_db_counter > self._corrupt_db_limit:
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self.hist_file = ':memory:'
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self.log.error("Failed to load history too many times, history will not be saved.")
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elif self.hist_file.is_file():
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# move the file out of the way
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base = str(self.hist_file.parent / self.hist_file.stem)
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ext = self.hist_file.suffix
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size = self.hist_file.stat().st_size
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if size >= _SAVE_DB_SIZE:
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# if there's significant content, avoid clobbering
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now = datetime.datetime.now().isoformat().replace(':', '.')
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newpath = base + '-corrupt-' + now + ext
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# don't clobber previous corrupt backups
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for i in range(100):
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if not Path(newpath).exists():
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break
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else:
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newpath = base + '-corrupt-' + now + (u'-%i' % i) + ext
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else:
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# not much content, possibly empty; don't worry about clobbering
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# maybe we should just delete it?
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newpath = base + '-corrupt' + ext
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self.hist_file.rename(newpath)
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self.log.error("History file was moved to %s and a new file created.", newpath)
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self.init_db()
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return []
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else:
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# Failed with :memory:, something serious is wrong
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raise
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class HistoryAccessorBase(LoggingConfigurable):
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"""An abstract class for History Accessors """
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def get_tail(self, n=10, raw=True, output=False, include_latest=False):
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raise NotImplementedError
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def search(self, pattern="*", raw=True, search_raw=True,
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output=False, n=None, unique=False):
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raise NotImplementedError
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def get_range(self, session, start=1, stop=None, raw=True,output=False):
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raise NotImplementedError
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def get_range_by_str(self, rangestr, raw=True, output=False):
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raise NotImplementedError
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class HistoryAccessor(HistoryAccessorBase):
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"""Access the history database without adding to it.
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This is intended for use by standalone history tools. IPython shells use
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HistoryManager, below, which is a subclass of this."""
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# counter for init_db retries, so we don't keep trying over and over
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_corrupt_db_counter = 0
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# after two failures, fallback on :memory:
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_corrupt_db_limit = 2
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# String holding the path to the history file
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hist_file = Union(
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[Instance(Path), Unicode()],
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help="""Path to file to use for SQLite history database.
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By default, IPython will put the history database in the IPython
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profile directory. If you would rather share one history among
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profiles, you can set this value in each, so that they are consistent.
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Due to an issue with fcntl, SQLite is known to misbehave on some NFS
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mounts. If you see IPython hanging, try setting this to something on a
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local disk, e.g::
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ipython --HistoryManager.hist_file=/tmp/ipython_hist.sqlite
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you can also use the specific value `:memory:` (including the colon
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at both end but not the back ticks), to avoid creating an history file.
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""",
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).tag(config=True)
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enabled = Bool(True,
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help="""enable the SQLite history
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set enabled=False to disable the SQLite history,
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in which case there will be no stored history, no SQLite connection,
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and no background saving thread. This may be necessary in some
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threaded environments where IPython is embedded.
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""",
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).tag(config=True)
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connection_options = Dict(
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help="""Options for configuring the SQLite connection
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These options are passed as keyword args to sqlite3.connect
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when establishing database connections.
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"""
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).tag(config=True)
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# The SQLite database
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db = Any()
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@observe('db')
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def _db_changed(self, change):
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"""validate the db, since it can be an Instance of two different types"""
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new = change['new']
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connection_types = (DummyDB, sqlite3.Connection)
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if not isinstance(new, connection_types):
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msg = "%s.db must be sqlite3 Connection or DummyDB, not %r" % \
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(self.__class__.__name__, new)
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raise TraitError(msg)
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def __init__(self, profile="default", hist_file="", **traits):
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"""Create a new history accessor.
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Parameters
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----------
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profile : str
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The name of the profile from which to open history.
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hist_file : str
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Path to an SQLite history database stored by IPython. If specified,
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hist_file overrides profile.
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config : :class:`~traitlets.config.loader.Config`
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Config object. hist_file can also be set through this.
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"""
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# We need a pointer back to the shell for various tasks.
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super(HistoryAccessor, self).__init__(**traits)
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# defer setting hist_file from kwarg until after init,
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# otherwise the default kwarg value would clobber any value
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# set by config
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if hist_file:
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self.hist_file = hist_file
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try:
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self.hist_file
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except TraitError:
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# No one has set the hist_file, yet.
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self.hist_file = self._get_hist_file_name(profile)
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self.init_db()
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def _get_hist_file_name(self, profile='default'):
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"""Find the history file for the given profile name.
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This is overridden by the HistoryManager subclass, to use the shell's
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active profile.
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Parameters
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----------
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profile : str
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The name of a profile which has a history file.
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"""
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return Path(locate_profile(profile)) / "history.sqlite"
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@catch_corrupt_db
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def init_db(self):
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"""Connect to the database, and create tables if necessary."""
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if not self.enabled:
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self.db = DummyDB()
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return
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# use detect_types so that timestamps return datetime objects
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kwargs = dict(detect_types=sqlite3.PARSE_DECLTYPES|sqlite3.PARSE_COLNAMES)
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kwargs.update(self.connection_options)
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self.db = sqlite3.connect(str(self.hist_file), **kwargs)
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with self.db:
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self.db.execute(
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"""CREATE TABLE IF NOT EXISTS sessions (session integer
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primary key autoincrement, start timestamp,
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end timestamp, num_cmds integer, remark text)"""
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)
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self.db.execute(
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"""CREATE TABLE IF NOT EXISTS history
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(session integer, line integer, source text, source_raw text,
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PRIMARY KEY (session, line))"""
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)
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# Output history is optional, but ensure the table's there so it can be
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# enabled later.
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self.db.execute(
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"""CREATE TABLE IF NOT EXISTS output_history
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(session integer, line integer, output text,
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PRIMARY KEY (session, line))"""
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)
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# success! reset corrupt db count
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self._corrupt_db_counter = 0
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def writeout_cache(self):
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"""Overridden by HistoryManager to dump the cache before certain
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database lookups."""
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pass
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## -------------------------------
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## Methods for retrieving history:
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## -------------------------------
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def _run_sql(self, sql, params, raw=True, output=False, latest=False):
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"""Prepares and runs an SQL query for the history database.
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Parameters
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----------
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sql : str
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Any filtering expressions to go after SELECT ... FROM ...
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params : tuple
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Parameters passed to the SQL query (to replace "?")
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raw, output : bool
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See :meth:`get_range`
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latest : bool
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Select rows with max (session, line)
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Returns
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-------
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Tuples as :meth:`get_range`
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"""
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toget = 'source_raw' if raw else 'source'
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sqlfrom = "history"
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if output:
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sqlfrom = "history LEFT JOIN output_history USING (session, line)"
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toget = "history.%s, output_history.output" % toget
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if latest:
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toget += ", MAX(session * 128 * 1024 + line)"
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this_querry = "SELECT session, line, %s FROM %s " % (toget, sqlfrom) + sql
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cur = self.db.execute(this_querry, params)
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if latest:
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cur = (row[:-1] for row in cur)
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if output: # Regroup into 3-tuples, and parse JSON
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return ((ses, lin, (inp, out)) for ses, lin, inp, out in cur)
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return cur
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@only_when_enabled
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@catch_corrupt_db
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def get_session_info(self, session):
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"""Get info about a session.
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Parameters
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----------
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session : int
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Session number to retrieve.
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Returns
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-------
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session_id : int
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Session ID number
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start : datetime
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Timestamp for the start of the session.
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end : datetime
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Timestamp for the end of the session, or None if IPython crashed.
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num_cmds : int
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Number of commands run, or None if IPython crashed.
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remark : unicode
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A manually set description.
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"""
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query = "SELECT * from sessions where session == ?"
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return self.db.execute(query, (session,)).fetchone()
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@catch_corrupt_db
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def get_last_session_id(self):
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"""Get the last session ID currently in the database.
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Within IPython, this should be the same as the value stored in
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:attr:`HistoryManager.session_number`.
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"""
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for record in self.get_tail(n=1, include_latest=True):
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return record[0]
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@catch_corrupt_db
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def get_tail(self, n=10, raw=True, output=False, include_latest=False):
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"""Get the last n lines from the history database.
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Most recent entry last.
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Completion will be reordered so that that the last ones are when
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possible from current session.
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Parameters
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----------
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n : int
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The number of lines to get
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raw, output : bool
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See :meth:`get_range`
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include_latest : bool
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If False (default), n+1 lines are fetched, and the latest one
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is discarded. This is intended to be used where the function
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is called by a user command, which it should not return.
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Returns
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-------
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Tuples as :meth:`get_range`
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"""
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self.writeout_cache()
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if not include_latest:
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n += 1
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# cursor/line/entry
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this_cur = list(
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self._run_sql(
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"WHERE session == ? ORDER BY line DESC LIMIT ? ",
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(self.session_number, n),
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raw=raw,
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output=output,
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)
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)
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other_cur = list(
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self._run_sql(
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"WHERE session != ? ORDER BY session DESC, line DESC LIMIT ?",
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(self.session_number, n),
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raw=raw,
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output=output,
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)
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)
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everything = this_cur + other_cur
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everything = everything[:n]
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if not include_latest:
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return list(everything)[:0:-1]
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return list(everything)[::-1]
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@catch_corrupt_db
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def search(self, pattern="*", raw=True, search_raw=True,
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output=False, n=None, unique=False):
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"""Search the database using unix glob-style matching (wildcards
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* and ?).
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Parameters
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----------
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pattern : str
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The wildcarded pattern to match when searching
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search_raw : bool
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If True, search the raw input, otherwise, the parsed input
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raw, output : bool
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See :meth:`get_range`
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n : None or int
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If an integer is given, it defines the limit of
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returned entries.
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unique : bool
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When it is true, return only unique entries.
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Returns
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-------
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Tuples as :meth:`get_range`
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"""
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tosearch = "source_raw" if search_raw else "source"
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if output:
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tosearch = "history." + tosearch
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self.writeout_cache()
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sqlform = "WHERE %s GLOB ?" % tosearch
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params = (pattern,)
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if unique:
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sqlform += ' GROUP BY {0}'.format(tosearch)
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if n is not None:
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sqlform += " ORDER BY session DESC, line DESC LIMIT ?"
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params += (n,)
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elif unique:
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sqlform += " ORDER BY session, line"
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cur = self._run_sql(sqlform, params, raw=raw, output=output, latest=unique)
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if n is not None:
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return reversed(list(cur))
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return cur
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@catch_corrupt_db
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def get_range(self, session, start=1, stop=None, raw=True,output=False):
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"""Retrieve input by session.
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Parameters
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----------
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session : int
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Session number to retrieve.
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start : int
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First line to retrieve.
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stop : int
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End of line range (excluded from output itself). If None, retrieve
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to the end of the session.
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raw : bool
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If True, return untranslated input
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output : bool
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If True, attempt to include output. This will be 'real' Python
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objects for the current session, or text reprs from previous
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sessions if db_log_output was enabled at the time. Where no output
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is found, None is used.
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Returns
|
|
|
-------
|
|
|
entries
|
|
|
An iterator over the desired lines. Each line is a 3-tuple, either
|
|
|
(session, line, input) if output is False, or
|
|
|
(session, line, (input, output)) if output is True.
|
|
|
"""
|
|
|
if stop:
|
|
|
lineclause = "line >= ? AND line < ?"
|
|
|
params = (session, start, stop)
|
|
|
else:
|
|
|
lineclause = "line>=?"
|
|
|
params = (session, start)
|
|
|
|
|
|
return self._run_sql("WHERE session==? AND %s" % lineclause,
|
|
|
params, raw=raw, output=output)
|
|
|
|
|
|
def get_range_by_str(self, rangestr, raw=True, output=False):
|
|
|
"""Get lines of history from a string of ranges, as used by magic
|
|
|
commands %hist, %save, %macro, etc.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
rangestr : str
|
|
|
A string specifying ranges, e.g. "5 ~2/1-4". If empty string is used,
|
|
|
this will return everything from current session's history.
|
|
|
|
|
|
See the documentation of :func:`%history` for the full details.
|
|
|
|
|
|
raw, output : bool
|
|
|
As :meth:`get_range`
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
Tuples as :meth:`get_range`
|
|
|
"""
|
|
|
for sess, s, e in extract_hist_ranges(rangestr):
|
|
|
for line in self.get_range(sess, s, e, raw=raw, output=output):
|
|
|
yield line
|
|
|
|
|
|
|
|
|
class HistoryManager(HistoryAccessor):
|
|
|
"""A class to organize all history-related functionality in one place.
|
|
|
"""
|
|
|
# Public interface
|
|
|
|
|
|
# An instance of the IPython shell we are attached to
|
|
|
shell = Instance('IPython.core.interactiveshell.InteractiveShellABC',
|
|
|
allow_none=True)
|
|
|
# Lists to hold processed and raw history. These start with a blank entry
|
|
|
# so that we can index them starting from 1
|
|
|
input_hist_parsed = List([""])
|
|
|
input_hist_raw = List([""])
|
|
|
# A list of directories visited during session
|
|
|
dir_hist = List()
|
|
|
@default('dir_hist')
|
|
|
def _dir_hist_default(self):
|
|
|
try:
|
|
|
return [Path.cwd()]
|
|
|
except OSError:
|
|
|
return []
|
|
|
|
|
|
# A dict of output history, keyed with ints from the shell's
|
|
|
# execution count.
|
|
|
output_hist = Dict()
|
|
|
# The text/plain repr of outputs.
|
|
|
output_hist_reprs = Dict()
|
|
|
|
|
|
# The number of the current session in the history database
|
|
|
session_number = Integer()
|
|
|
|
|
|
db_log_output = Bool(False,
|
|
|
help="Should the history database include output? (default: no)"
|
|
|
).tag(config=True)
|
|
|
db_cache_size = Integer(0,
|
|
|
help="Write to database every x commands (higher values save disk access & power).\n"
|
|
|
"Values of 1 or less effectively disable caching."
|
|
|
).tag(config=True)
|
|
|
# The input and output caches
|
|
|
db_input_cache = List()
|
|
|
db_output_cache = List()
|
|
|
|
|
|
# History saving in separate thread
|
|
|
save_thread = Instance('IPython.core.history.HistorySavingThread',
|
|
|
allow_none=True)
|
|
|
save_flag = Instance(threading.Event, allow_none=True)
|
|
|
|
|
|
# Private interface
|
|
|
# Variables used to store the three last inputs from the user. On each new
|
|
|
# history update, we populate the user's namespace with these, shifted as
|
|
|
# necessary.
|
|
|
_i00 = Unicode(u'')
|
|
|
_i = Unicode(u'')
|
|
|
_ii = Unicode(u'')
|
|
|
_iii = Unicode(u'')
|
|
|
|
|
|
# A regex matching all forms of the exit command, so that we don't store
|
|
|
# them in the history (it's annoying to rewind the first entry and land on
|
|
|
# an exit call).
|
|
|
_exit_re = re.compile(r"(exit|quit)(\s*\(.*\))?$")
|
|
|
|
|
|
def __init__(self, shell=None, config=None, **traits):
|
|
|
"""Create a new history manager associated with a shell instance.
|
|
|
"""
|
|
|
# We need a pointer back to the shell for various tasks.
|
|
|
super(HistoryManager, self).__init__(shell=shell, config=config,
|
|
|
**traits)
|
|
|
self.save_flag = threading.Event()
|
|
|
self.db_input_cache_lock = threading.Lock()
|
|
|
self.db_output_cache_lock = threading.Lock()
|
|
|
|
|
|
try:
|
|
|
self.new_session()
|
|
|
except sqlite3.OperationalError:
|
|
|
self.log.error("Failed to create history session in %s. History will not be saved.",
|
|
|
self.hist_file, exc_info=True)
|
|
|
self.hist_file = ':memory:'
|
|
|
|
|
|
if self.enabled and self.hist_file != ':memory:':
|
|
|
self.save_thread = HistorySavingThread(self)
|
|
|
self.save_thread.start()
|
|
|
|
|
|
def _get_hist_file_name(self, profile=None):
|
|
|
"""Get default history file name based on the Shell's profile.
|
|
|
|
|
|
The profile parameter is ignored, but must exist for compatibility with
|
|
|
the parent class."""
|
|
|
profile_dir = self.shell.profile_dir.location
|
|
|
return Path(profile_dir) / "history.sqlite"
|
|
|
|
|
|
@only_when_enabled
|
|
|
def new_session(self, conn=None):
|
|
|
"""Get a new session number."""
|
|
|
if conn is None:
|
|
|
conn = self.db
|
|
|
|
|
|
with conn:
|
|
|
cur = conn.execute("""INSERT INTO sessions VALUES (NULL, ?, NULL,
|
|
|
NULL, "") """, (datetime.datetime.now(),))
|
|
|
self.session_number = cur.lastrowid
|
|
|
|
|
|
def end_session(self):
|
|
|
"""Close the database session, filling in the end time and line count."""
|
|
|
self.writeout_cache()
|
|
|
with self.db:
|
|
|
self.db.execute("""UPDATE sessions SET end=?, num_cmds=? WHERE
|
|
|
session==?""", (datetime.datetime.now(),
|
|
|
len(self.input_hist_parsed)-1, self.session_number))
|
|
|
self.session_number = 0
|
|
|
|
|
|
def name_session(self, name):
|
|
|
"""Give the current session a name in the history database."""
|
|
|
with self.db:
|
|
|
self.db.execute("UPDATE sessions SET remark=? WHERE session==?",
|
|
|
(name, self.session_number))
|
|
|
|
|
|
def reset(self, new_session=True):
|
|
|
"""Clear the session history, releasing all object references, and
|
|
|
optionally open a new session."""
|
|
|
self.output_hist.clear()
|
|
|
# The directory history can't be completely empty
|
|
|
self.dir_hist[:] = [Path.cwd()]
|
|
|
|
|
|
if new_session:
|
|
|
if self.session_number:
|
|
|
self.end_session()
|
|
|
self.input_hist_parsed[:] = [""]
|
|
|
self.input_hist_raw[:] = [""]
|
|
|
self.new_session()
|
|
|
|
|
|
# ------------------------------
|
|
|
# Methods for retrieving history
|
|
|
# ------------------------------
|
|
|
def get_session_info(self, session=0):
|
|
|
"""Get info about a session.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
session : int
|
|
|
Session number to retrieve. The current session is 0, and negative
|
|
|
numbers count back from current session, so -1 is the previous session.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
session_id : int
|
|
|
Session ID number
|
|
|
start : datetime
|
|
|
Timestamp for the start of the session.
|
|
|
end : datetime
|
|
|
Timestamp for the end of the session, or None if IPython crashed.
|
|
|
num_cmds : int
|
|
|
Number of commands run, or None if IPython crashed.
|
|
|
remark : unicode
|
|
|
A manually set description.
|
|
|
"""
|
|
|
if session <= 0:
|
|
|
session += self.session_number
|
|
|
|
|
|
return super(HistoryManager, self).get_session_info(session=session)
|
|
|
|
|
|
def _get_range_session(self, start=1, stop=None, raw=True, output=False):
|
|
|
"""Get input and output history from the current session. Called by
|
|
|
get_range, and takes similar parameters."""
|
|
|
input_hist = self.input_hist_raw if raw else self.input_hist_parsed
|
|
|
|
|
|
n = len(input_hist)
|
|
|
if start < 0:
|
|
|
start += n
|
|
|
if not stop or (stop > n):
|
|
|
stop = n
|
|
|
elif stop < 0:
|
|
|
stop += n
|
|
|
|
|
|
for i in range(start, stop):
|
|
|
if output:
|
|
|
line = (input_hist[i], self.output_hist_reprs.get(i))
|
|
|
else:
|
|
|
line = input_hist[i]
|
|
|
yield (0, i, line)
|
|
|
|
|
|
def get_range(self, session=0, start=1, stop=None, raw=True,output=False):
|
|
|
"""Retrieve input by session.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
session : int
|
|
|
Session number to retrieve. The current session is 0, and negative
|
|
|
numbers count back from current session, so -1 is previous session.
|
|
|
start : int
|
|
|
First line to retrieve.
|
|
|
stop : int
|
|
|
End of line range (excluded from output itself). If None, retrieve
|
|
|
to the end of the session.
|
|
|
raw : bool
|
|
|
If True, return untranslated input
|
|
|
output : bool
|
|
|
If True, attempt to include output. This will be 'real' Python
|
|
|
objects for the current session, or text reprs from previous
|
|
|
sessions if db_log_output was enabled at the time. Where no output
|
|
|
is found, None is used.
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
entries
|
|
|
An iterator over the desired lines. Each line is a 3-tuple, either
|
|
|
(session, line, input) if output is False, or
|
|
|
(session, line, (input, output)) if output is True.
|
|
|
"""
|
|
|
if session <= 0:
|
|
|
session += self.session_number
|
|
|
if session==self.session_number: # Current session
|
|
|
return self._get_range_session(start, stop, raw, output)
|
|
|
return super(HistoryManager, self).get_range(session, start, stop, raw,
|
|
|
output)
|
|
|
|
|
|
## ----------------------------
|
|
|
## Methods for storing history:
|
|
|
## ----------------------------
|
|
|
def store_inputs(self, line_num, source, source_raw=None):
|
|
|
"""Store source and raw input in history and create input cache
|
|
|
variables ``_i*``.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
line_num : int
|
|
|
The prompt number of this input.
|
|
|
source : str
|
|
|
Python input.
|
|
|
source_raw : str, optional
|
|
|
If given, this is the raw input without any IPython transformations
|
|
|
applied to it. If not given, ``source`` is used.
|
|
|
"""
|
|
|
if source_raw is None:
|
|
|
source_raw = source
|
|
|
source = source.rstrip('\n')
|
|
|
source_raw = source_raw.rstrip('\n')
|
|
|
|
|
|
# do not store exit/quit commands
|
|
|
if self._exit_re.match(source_raw.strip()):
|
|
|
return
|
|
|
|
|
|
self.input_hist_parsed.append(source)
|
|
|
self.input_hist_raw.append(source_raw)
|
|
|
|
|
|
with self.db_input_cache_lock:
|
|
|
self.db_input_cache.append((line_num, source, source_raw))
|
|
|
# Trigger to flush cache and write to DB.
|
|
|
if len(self.db_input_cache) >= self.db_cache_size:
|
|
|
self.save_flag.set()
|
|
|
|
|
|
# update the auto _i variables
|
|
|
self._iii = self._ii
|
|
|
self._ii = self._i
|
|
|
self._i = self._i00
|
|
|
self._i00 = source_raw
|
|
|
|
|
|
# hackish access to user namespace to create _i1,_i2... dynamically
|
|
|
new_i = '_i%s' % line_num
|
|
|
to_main = {'_i': self._i,
|
|
|
'_ii': self._ii,
|
|
|
'_iii': self._iii,
|
|
|
new_i : self._i00 }
|
|
|
|
|
|
if self.shell is not None:
|
|
|
self.shell.push(to_main, interactive=False)
|
|
|
|
|
|
def store_output(self, line_num):
|
|
|
"""If database output logging is enabled, this saves all the
|
|
|
outputs from the indicated prompt number to the database. It's
|
|
|
called by run_cell after code has been executed.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
line_num : int
|
|
|
The line number from which to save outputs
|
|
|
"""
|
|
|
if (not self.db_log_output) or (line_num not in self.output_hist_reprs):
|
|
|
return
|
|
|
output = self.output_hist_reprs[line_num]
|
|
|
|
|
|
with self.db_output_cache_lock:
|
|
|
self.db_output_cache.append((line_num, output))
|
|
|
if self.db_cache_size <= 1:
|
|
|
self.save_flag.set()
|
|
|
|
|
|
def _writeout_input_cache(self, conn):
|
|
|
with conn:
|
|
|
for line in self.db_input_cache:
|
|
|
conn.execute("INSERT INTO history VALUES (?, ?, ?, ?)",
|
|
|
(self.session_number,)+line)
|
|
|
|
|
|
def _writeout_output_cache(self, conn):
|
|
|
with conn:
|
|
|
for line in self.db_output_cache:
|
|
|
conn.execute("INSERT INTO output_history VALUES (?, ?, ?)",
|
|
|
(self.session_number,)+line)
|
|
|
|
|
|
@only_when_enabled
|
|
|
def writeout_cache(self, conn=None):
|
|
|
"""Write any entries in the cache to the database."""
|
|
|
if conn is None:
|
|
|
conn = self.db
|
|
|
|
|
|
with self.db_input_cache_lock:
|
|
|
try:
|
|
|
self._writeout_input_cache(conn)
|
|
|
except sqlite3.IntegrityError:
|
|
|
self.new_session(conn)
|
|
|
print("ERROR! Session/line number was not unique in",
|
|
|
"database. History logging moved to new session",
|
|
|
self.session_number)
|
|
|
try:
|
|
|
# Try writing to the new session. If this fails, don't
|
|
|
# recurse
|
|
|
self._writeout_input_cache(conn)
|
|
|
except sqlite3.IntegrityError:
|
|
|
pass
|
|
|
finally:
|
|
|
self.db_input_cache = []
|
|
|
|
|
|
with self.db_output_cache_lock:
|
|
|
try:
|
|
|
self._writeout_output_cache(conn)
|
|
|
except sqlite3.IntegrityError:
|
|
|
print("!! Session/line number for output was not unique",
|
|
|
"in database. Output will not be stored.")
|
|
|
finally:
|
|
|
self.db_output_cache = []
|
|
|
|
|
|
|
|
|
class HistorySavingThread(threading.Thread):
|
|
|
"""This thread takes care of writing history to the database, so that
|
|
|
the UI isn't held up while that happens.
|
|
|
|
|
|
It waits for the HistoryManager's save_flag to be set, then writes out
|
|
|
the history cache. The main thread is responsible for setting the flag when
|
|
|
the cache size reaches a defined threshold."""
|
|
|
daemon = True
|
|
|
stop_now = False
|
|
|
enabled = True
|
|
|
def __init__(self, history_manager):
|
|
|
super(HistorySavingThread, self).__init__(name="IPythonHistorySavingThread")
|
|
|
self.history_manager = history_manager
|
|
|
self.enabled = history_manager.enabled
|
|
|
atexit.register(self.stop)
|
|
|
|
|
|
@only_when_enabled
|
|
|
def run(self):
|
|
|
# We need a separate db connection per thread:
|
|
|
try:
|
|
|
self.db = sqlite3.connect(
|
|
|
str(self.history_manager.hist_file),
|
|
|
**self.history_manager.connection_options,
|
|
|
)
|
|
|
while True:
|
|
|
self.history_manager.save_flag.wait()
|
|
|
if self.stop_now:
|
|
|
self.db.close()
|
|
|
return
|
|
|
self.history_manager.save_flag.clear()
|
|
|
self.history_manager.writeout_cache(self.db)
|
|
|
except Exception as e:
|
|
|
print(("The history saving thread hit an unexpected error (%s)."
|
|
|
"History will not be written to the database.") % repr(e))
|
|
|
|
|
|
def stop(self):
|
|
|
"""This can be called from the main thread to safely stop this thread.
|
|
|
|
|
|
Note that it does not attempt to write out remaining history before
|
|
|
exiting. That should be done by calling the HistoryManager's
|
|
|
end_session method."""
|
|
|
self.stop_now = True
|
|
|
self.history_manager.save_flag.set()
|
|
|
self.join()
|
|
|
|
|
|
|
|
|
# To match, e.g. ~5/8-~2/3
|
|
|
range_re = re.compile(r"""
|
|
|
((?P<startsess>~?\d+)/)?
|
|
|
(?P<start>\d+)?
|
|
|
((?P<sep>[\-:])
|
|
|
((?P<endsess>~?\d+)/)?
|
|
|
(?P<end>\d+))?
|
|
|
$""", re.VERBOSE)
|
|
|
|
|
|
|
|
|
def extract_hist_ranges(ranges_str):
|
|
|
"""Turn a string of history ranges into 3-tuples of (session, start, stop).
|
|
|
|
|
|
Empty string results in a `[(0, 1, None)]`, i.e. "everything from current
|
|
|
session".
|
|
|
|
|
|
Examples
|
|
|
--------
|
|
|
>>> list(extract_hist_ranges("~8/5-~7/4 2"))
|
|
|
[(-8, 5, None), (-7, 1, 5), (0, 2, 3)]
|
|
|
"""
|
|
|
if ranges_str == "":
|
|
|
yield (0, 1, None) # Everything from current session
|
|
|
return
|
|
|
|
|
|
for range_str in ranges_str.split():
|
|
|
rmatch = range_re.match(range_str)
|
|
|
if not rmatch:
|
|
|
continue
|
|
|
start = rmatch.group("start")
|
|
|
if start:
|
|
|
start = int(start)
|
|
|
end = rmatch.group("end")
|
|
|
# If no end specified, get (a, a + 1)
|
|
|
end = int(end) if end else start + 1
|
|
|
else: # start not specified
|
|
|
if not rmatch.group('startsess'): # no startsess
|
|
|
continue
|
|
|
start = 1
|
|
|
end = None # provide the entire session hist
|
|
|
|
|
|
if rmatch.group("sep") == "-": # 1-3 == 1:4 --> [1, 2, 3]
|
|
|
end += 1
|
|
|
startsess = rmatch.group("startsess") or "0"
|
|
|
endsess = rmatch.group("endsess") or startsess
|
|
|
startsess = int(startsess.replace("~","-"))
|
|
|
endsess = int(endsess.replace("~","-"))
|
|
|
assert endsess >= startsess, "start session must be earlier than end session"
|
|
|
|
|
|
if endsess == startsess:
|
|
|
yield (startsess, start, end)
|
|
|
continue
|
|
|
# Multiple sessions in one range:
|
|
|
yield (startsess, start, None)
|
|
|
for sess in range(startsess+1, endsess):
|
|
|
yield (sess, 1, None)
|
|
|
yield (endsess, 1, end)
|
|
|
|
|
|
|
|
|
def _format_lineno(session, line):
|
|
|
"""Helper function to format line numbers properly."""
|
|
|
if session == 0:
|
|
|
return str(line)
|
|
|
return "%s#%s" % (session, line)
|
|
|
|
