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# coding: utf-8

"""test the IPython Kernel"""

#-------------------------------------------------------------------------------

# Copyright (C) 2013 The IPython Development Team

#

# Distributed under the terms of the BSD License. The full license is in

# the file COPYING, distributed as part of this software.

#-------------------------------------------------------------------------------

#-------------------------------------------------------------------------------

# Imports

#-------------------------------------------------------------------------------

import io

import os.path

import sys

import nose.tools as nt

from IPython.testing import decorators as dec, tools as tt

from IPython.utils import py3compat

from IPython.utils.path import locate_profile

from IPython.utils.tempdir import TemporaryDirectory

from .utils import (new_kernel, kernel, TIMEOUT, assemble_output, execute,

flush_channels, wait_for_idle)

#-------------------------------------------------------------------------------

# Tests

#-------------------------------------------------------------------------------

def _check_mp_mode(kc, expected=False, stream="stdout"):

execute(kc=kc, code="import sys")

flush_channels(kc)

msg_id, content = execute(kc=kc, code="print (sys.%s._check_mp_mode())" % stream)

stdout, stderr = assemble_output(kc.iopub_channel)

nt.assert_equal(eval(stdout.strip()), expected)

# printing tests

def test_simple_print():

"""simple print statement in kernel"""

with kernel() as kc:

iopub = kc.iopub_channel

msg_id, content = execute(kc=kc, code="print ('hi')")

stdout, stderr = assemble_output(iopub)

nt.assert_equal(stdout, 'hi\n')

nt.assert_equal(stderr, '')

_check_mp_mode(kc, expected=False)

def test_sys_path():

"""test that sys.path doesn't get messed up by default"""

with kernel() as kc:

msg_id, content = execute(kc=kc, code="import sys; print (repr(sys.path[0]))")

stdout, stderr = assemble_output(kc.iopub_channel)

nt.assert_equal(stdout, "''\n")

def test_sys_path_profile_dir():

"""test that sys.path doesn't get messed up when `--profile-dir` is specified"""

with new_kernel(['--profile-dir', locate_profile('default')]) as kc:

msg_id, content = execute(kc=kc, code="import sys; print (repr(sys.path[0]))")

stdout, stderr = assemble_output(kc.iopub_channel)

nt.assert_equal(stdout, "''\n")

@dec.knownfailureif(sys.platform == 'win32', "subprocess prints fail on Windows")

def test_subprocess_print():

"""printing from forked mp.Process"""

with new_kernel() as kc:

iopub = kc.iopub_channel

_check_mp_mode(kc, expected=False)

flush_channels(kc)

np = 5

code = '\n'.join([

"from __future__ import print_function",

"import multiprocessing as mp",

"pool = [mp.Process(target=print, args=('hello', i,)) for i in range(%i)]" % np,

"for p in pool: p.start()",

"for p in pool: p.join()"

])

expected = '\n'.join([

"hello %s" % i for i in range(np)

]) + '\n'

msg_id, content = execute(kc=kc, code=code)

stdout, stderr = assemble_output(iopub)

nt.assert_equal(stdout.count("hello"), np, stdout)

for n in range(np):

nt.assert_equal(stdout.count(str(n)), 1, stdout)

nt.assert_equal(stderr, '')

_check_mp_mode(kc, expected=False)

_check_mp_mode(kc, expected=False, stream="stderr")

def test_subprocess_noprint():

"""mp.Process without print doesn't trigger iostream mp_mode"""

with kernel() as kc:

iopub = kc.iopub_channel

np = 5

code = '\n'.join([

"import multiprocessing as mp",

"pool = [mp.Process(target=range, args=(i,)) for i in range(%i)]" % np,

"for p in pool: p.start()",

"for p in pool: p.join()"

])

msg_id, content = execute(kc=kc, code=code)

stdout, stderr = assemble_output(iopub)

nt.assert_equal(stdout, '')

nt.assert_equal(stderr, '')

_check_mp_mode(kc, expected=False)

_check_mp_mode(kc, expected=False, stream="stderr")

@dec.knownfailureif(sys.platform == 'win32', "subprocess prints fail on Windows")

def test_subprocess_error():

"""error in mp.Process doesn't crash"""

with new_kernel() as kc:

iopub = kc.iopub_channel

code = '\n'.join([

"import multiprocessing as mp",

"p = mp.Process(target=int, args=('hi',))",

"p.start()",

"p.join()",

])

msg_id, content = execute(kc=kc, code=code)

stdout, stderr = assemble_output(iopub)

nt.assert_equal(stdout, '')

nt.assert_true("ValueError" in stderr, stderr)

_check_mp_mode(kc, expected=False)

_check_mp_mode(kc, expected=False, stream="stderr")

# raw_input tests

def test_raw_input():

"""test [raw_]input"""

with kernel() as kc:

iopub = kc.iopub_channel

input_f = "input" if py3compat.PY3 else "raw_input"

theprompt = "prompt> "

code = 'print({input_f}("{theprompt}"))'.format(**locals())

msg_id = kc.execute(code, allow_stdin=True)

msg = kc.get_stdin_msg(block=True, timeout=TIMEOUT)

nt.assert_equal(msg['header']['msg_type'], u'input_request')

content = msg['content']

nt.assert_equal(content['prompt'], theprompt)

text = "some text"

kc.input(text)

reply = kc.get_shell_msg(block=True, timeout=TIMEOUT)

nt.assert_equal(reply['content']['status'], 'ok')

stdout, stderr = assemble_output(iopub)

nt.assert_equal(stdout, text + "\n")

@dec.skipif(py3compat.PY3)

def test_eval_input():

"""test input() on Python 2"""

with kernel() as kc:

iopub = kc.iopub_channel

input_f = "input" if py3compat.PY3 else "raw_input"

theprompt = "prompt> "

code = 'print(input("{theprompt}"))'.format(**locals())

msg_id = kc.execute(code, allow_stdin=True)

msg = kc.get_stdin_msg(block=True, timeout=TIMEOUT)

nt.assert_equal(msg['header']['msg_type'], u'input_request')

content = msg['content']

nt.assert_equal(content['prompt'], theprompt)

kc.input("1+1")

reply = kc.get_shell_msg(block=True, timeout=TIMEOUT)

nt.assert_equal(reply['content']['status'], 'ok')

stdout, stderr = assemble_output(iopub)

nt.assert_equal(stdout, "2\n")

def test_save_history():

# Saving history from the kernel with %hist -f was failing because of

# unicode problems on Python 2.

with kernel() as kc, TemporaryDirectory() as td:

file = os.path.join(td, 'hist.out')

execute(u'a=1', kc=kc)

wait_for_idle(kc)

execute(u'b=u"abcþ"', kc=kc)

wait_for_idle(kc)

_, reply = execute("%hist -f " + file, kc=kc)

nt.assert_equal(reply['status'], 'ok')

with io.open(file, encoding='utf-8') as f:

content = f.read()

nt.assert_in(u'a=1', content)

nt.assert_in(u'b=u"abcþ"', content)

def test_help_output():

"""ipython kernel --help-all works"""

tt.help_all_output_test('kernel')