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""" History related magics and functionality """
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#-----------------------------------------------------------------------------
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# Copyright (C) 2010-2011 The IPython Development Team.
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#
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# Distributed under the terms of the BSD License.
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#
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# The full license is in the file COPYING.txt, distributed with this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Imports
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#-----------------------------------------------------------------------------
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from __future__ import print_function
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# Stdlib imports
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import atexit
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import datetime
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import os
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import re
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try:
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import sqlite3
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except ImportError:
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try:
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from pysqlite2 import dbapi2 as sqlite3
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except ImportError:
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sqlite3 = None
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import threading
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# Our own packages
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from IPython.config.configurable import Configurable
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from IPython.external.decorator import decorator
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from IPython.utils.path import locate_profile
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from IPython.utils.traitlets import (
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Any, Bool, Dict, Instance, Integer, List, Unicode, TraitError,
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)
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from IPython.utils.warn import warn
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#-----------------------------------------------------------------------------
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# Classes and functions
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#-----------------------------------------------------------------------------
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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 needs_sqlite(f, self, *a, **kw):
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"""return an empty list in the absence of sqlite"""
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if sqlite3 is None or 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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if sqlite3 is not None:
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DatabaseError = sqlite3.DatabaseError
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else:
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class DatabaseError(Exception):
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"Dummy exception when sqlite could not be imported. Should never occur."
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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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"""
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try:
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return f(self, *a, **kw)
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except DatabaseError:
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if os.path.isfile(self.hist_file):
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# Try to move the file out of the way
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base,ext = os.path.splitext(self.hist_file)
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newpath = base + '-corrupt' + ext
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os.rename(self.hist_file, newpath)
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self.init_db()
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print("ERROR! History file wasn't a valid SQLite database.",
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"It was moved to %s" % newpath, "and a new file created.")
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return []
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else:
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# The hist_file is probably :memory: or something else.
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raise
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class HistoryAccessor(Configurable):
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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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# String holding the path to the history file
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hist_file = Unicode(config=True,
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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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""")
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enabled = Bool(True, config=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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)
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connection_options = Dict(config=True,
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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 conenctions.
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"""
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)
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# The SQLite database
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db = Any()
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def _db_changed(self, name, old, new):
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"""validate the db, since it can be an Instance of two different types"""
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connection_types = (DummyDB,)
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if sqlite3 is not None:
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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=u'', config=None, **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 :
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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__(config=config, **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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if self.hist_file == u'':
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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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if sqlite3 is None and self.enabled:
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warn("IPython History requires SQLite, your history will not be saved")
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self.enabled = False
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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 os.path.join(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(self.hist_file, **kwargs)
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self.db.execute("""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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self.db.execute("""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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# 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("""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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self.db.commit()
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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):
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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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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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cur = self.db.execute("SELECT session, line, %s FROM %s " %\
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(toget, sqlfrom) + sql, params)
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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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@needs_sqlite
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@catch_corrupt_db
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def get_session_info(self, session=0):
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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. The current session is 0, and negative
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numbers count back from current session, so -1 is previous session.
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Returns
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-------
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(session_id [int], start [datetime], end [datetime], num_cmds [int],
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remark [unicode])
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Sessions that are running or did not exit cleanly will have `end=None`
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and `num_cmds=None`.
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"""
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if session <= 0:
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session += self.session_number
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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_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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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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cur = self._run_sql("ORDER BY session DESC, line DESC LIMIT ?",
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(n,), raw=raw, output=output)
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if not include_latest:
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return reversed(list(cur)[1:])
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return reversed(list(cur))
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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)
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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
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-------
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An iterator over the desired lines. Each line is a 3-tuple, either
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(session, line, input) if output is False, or
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(session, line, (input, output)) if output is True.
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"""
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if stop:
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lineclause = "line >= ? AND line < ?"
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params = (session, start, stop)
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else:
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lineclause = "line>=?"
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params = (session, start)
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return self._run_sql("WHERE session==? AND %s" % lineclause,
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params, raw=raw, output=output)
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def get_range_by_str(self, rangestr, raw=True, output=False):
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"""Get lines of history from a string of ranges, as used by magic
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commands %hist, %save, %macro, etc.
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Parameters
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----------
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rangestr : str
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A string specifying ranges, e.g. "5 ~2/1-4". See
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:func:`magic_history` for full details.
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raw, output : bool
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As :meth:`get_range`
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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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for sess, s, e in extract_hist_ranges(rangestr):
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for line in self.get_range(sess, s, e, raw=raw, output=output):
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yield line
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class HistoryManager(HistoryAccessor):
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"""A class to organize all history-related functionality in one place.
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"""
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# Public interface
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# An instance of the IPython shell we are attached to
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shell = Instance('IPython.core.interactiveshell.InteractiveShellABC')
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# Lists to hold processed and raw history. These start with a blank entry
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# so that we can index them starting from 1
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input_hist_parsed = List([""])
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input_hist_raw = List([""])
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# A list of directories visited during session
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dir_hist = List()
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def _dir_hist_default(self):
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try:
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return [os.getcwdu()]
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except OSError:
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return []
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# A dict of output history, keyed with ints from the shell's
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# execution count.
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output_hist = Dict()
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# The text/plain repr of outputs.
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output_hist_reprs = Dict()
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# The number of the current session in the history database
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session_number = Integer()
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# Should we log output to the database? (default no)
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db_log_output = Bool(False, config=True)
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# Write to database every x commands (higher values save disk access & power)
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# Values of 1 or less effectively disable caching.
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db_cache_size = Integer(0, config=True)
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# The input and output caches
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db_input_cache = List()
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db_output_cache = List()
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# History saving in separate thread
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save_thread = Instance('IPython.core.history.HistorySavingThread')
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try: # Event is a function returning an instance of _Event...
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save_flag = Instance(threading._Event)
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except AttributeError: # ...until Python 3.3, when it's a class.
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save_flag = Instance(threading.Event)
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# Private interface
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# Variables used to store the three last inputs from the user. On each new
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# history update, we populate the user's namespace with these, shifted as
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# necessary.
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_i00 = Unicode(u'')
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_i = Unicode(u'')
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_ii = Unicode(u'')
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_iii = Unicode(u'')
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# A regex matching all forms of the exit command, so that we don't store
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# them in the history (it's annoying to rewind the first entry and land on
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# an exit call).
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_exit_re = re.compile(r"(exit|quit)(\s*\(.*\))?$")
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def __init__(self, shell=None, config=None, **traits):
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"""Create a new history manager associated with a shell instance.
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"""
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# We need a pointer back to the shell for various tasks.
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super(HistoryManager, self).__init__(shell=shell, config=config,
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**traits)
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self.save_flag = threading.Event()
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self.db_input_cache_lock = threading.Lock()
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self.db_output_cache_lock = threading.Lock()
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if self.enabled and self.hist_file != ':memory:':
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self.save_thread = HistorySavingThread(self)
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self.save_thread.start()
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self.new_session()
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def _get_hist_file_name(self, profile=None):
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"""Get default history file name based on the Shell's profile.
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The profile parameter is ignored, but must exist for compatibility with
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the parent class."""
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profile_dir = self.shell.profile_dir.location
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return os.path.join(profile_dir, 'history.sqlite')
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@needs_sqlite
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def new_session(self, conn=None):
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"""Get a new session number."""
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if conn is None:
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conn = self.db
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with conn:
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cur = conn.execute("""INSERT INTO sessions VALUES (NULL, ?, NULL,
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NULL, "") """, (datetime.datetime.now(),))
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self.session_number = cur.lastrowid
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def end_session(self):
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"""Close the database session, filling in the end time and line count."""
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self.writeout_cache()
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with self.db:
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self.db.execute("""UPDATE sessions SET end=?, num_cmds=? WHERE
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session==?""", (datetime.datetime.now(),
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len(self.input_hist_parsed)-1, self.session_number))
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self.session_number = 0
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def name_session(self, name):
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"""Give the current session a name in the history database."""
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with self.db:
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self.db.execute("UPDATE sessions SET remark=? WHERE session==?",
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(name, self.session_number))
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def reset(self, new_session=True):
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"""Clear the session history, releasing all object references, and
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optionally open a new session."""
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self.output_hist.clear()
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# The directory history can't be completely empty
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self.dir_hist[:] = [os.getcwdu()]
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if new_session:
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if self.session_number:
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self.end_session()
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self.input_hist_parsed[:] = [""]
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self.input_hist_raw[:] = [""]
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self.new_session()
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# ------------------------------
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# Methods for retrieving history
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# ------------------------------
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def _get_range_session(self, start=1, stop=None, raw=True, output=False):
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"""Get input and output history from the current session. Called by
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get_range, and takes similar parameters."""
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input_hist = self.input_hist_raw if raw else self.input_hist_parsed
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n = len(input_hist)
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if start < 0:
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start += n
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if not stop or (stop > n):
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stop = n
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elif stop < 0:
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stop += n
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for i in range(start, stop):
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if output:
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line = (input_hist[i], self.output_hist_reprs.get(i))
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else:
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line = input_hist[i]
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yield (0, i, line)
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def get_range(self, session=0, 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. The current session is 0, and negative
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numbers count back from current session, so -1 is previous session.
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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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|
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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
|
|
|
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
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|
-------
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|
|
An iterator over the desired lines. Each line is a 3-tuple, either
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(session, line, input) if output is False, or
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(session, line, (input, output)) if output is True.
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|
"""
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|
|
if session <= 0:
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|
session += self.session_number
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|
|
if session==self.session_number: # Current session
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|
return self._get_range_session(start, stop, raw, output)
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|
|
return super(HistoryManager, self).get_range(session, start, stop, raw,
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|
|
output)
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|
|
|
## ----------------------------
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|
|
## Methods for storing history:
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|
|
## ----------------------------
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|
def store_inputs(self, line_num, source, source_raw=None):
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|
"""Store source and raw input in history and create input cache
|
|
|
variables _i*.
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|
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|
Parameters
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|
----------
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|
|
line_num : int
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|
|
The prompt number of this input.
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|
|
source : str
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|
|
Python input.
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|
|
source_raw : str, optional
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|
|
If given, this is the raw input without any IPython transformations
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|
|
applied to it. If not given, ``source`` is used.
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|
|
"""
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|
|
if source_raw is None:
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|
|
source_raw = source
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|
|
source = source.rstrip('\n')
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|
|
source_raw = source_raw.rstrip('\n')
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|
# do not store exit/quit commands
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|
|
if self._exit_re.match(source_raw.strip()):
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|
return
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|
|
self.input_hist_parsed.append(source)
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|
self.input_hist_raw.append(source_raw)
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|
|
with self.db_input_cache_lock:
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self.db_input_cache.append((line_num, source, source_raw))
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|
# Trigger to flush cache and write to DB.
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|
if len(self.db_input_cache) >= self.db_cache_size:
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|
self.save_flag.set()
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|
|
# update the auto _i variables
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|
|
self._iii = self._ii
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|
|
self._ii = self._i
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|
|
self._i = self._i00
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|
|
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,
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|
|
'_ii': self._ii,
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|
|
'_iii': self._iii,
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|
|
new_i : self._i00 }
|
|
|
|
|
|
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 (?, ?, ?, ?)",
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|
|
(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)
|
|
|
|
|
|
@needs_sqlite
|
|
|
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__()
|
|
|
self.history_manager = history_manager
|
|
|
self.enabled = history_manager.enabled
|
|
|
atexit.register(self.stop)
|
|
|
|
|
|
@needs_sqlite
|
|
|
def run(self):
|
|
|
# We need a separate db connection per thread:
|
|
|
try:
|
|
|
self.db = sqlite3.connect(self.history_manager.hist_file,
|
|
|
**self.history_manager.connection_options
|
|
|
)
|
|
|
while True:
|
|
|
self.history_manager.save_flag.wait()
|
|
|
if self.stop_now:
|
|
|
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).
|
|
|
|
|
|
Examples
|
|
|
--------
|
|
|
list(extract_input_ranges("~8/5-~7/4 2"))
|
|
|
[(-8, 5, None), (-7, 1, 4), (0, 2, 3)]
|
|
|
"""
|
|
|
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)
|
|
|
|
|
|
|
|
|
|
