# Copyright 2016 The TensorFlow Authors. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
"""Unit tests for source_utils."""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import os
import shutil
import tempfile

import numpy as np

from tensorflow.core.protobuf import config_pb2
from tensorflow.python.client import session
from tensorflow.python.debug.lib import debug_data
from tensorflow.python.debug.lib import debug_utils
from tensorflow.python.debug.lib import source_utils
from tensorflow.python.framework import constant_op
from tensorflow.python.framework import ops
from tensorflow.python.framework import test_util
from tensorflow.python.ops import control_flow_ops
from tensorflow.python.ops import math_ops
# Import resource_variable_ops for the variables-to-tensor implicit conversion.
from tensorflow.python.ops import resource_variable_ops  # pylint: disable=unused-import
from tensorflow.python.ops import variables
from tensorflow.python.platform import googletest
from tensorflow.python.util import tf_inspect


def line_number_above():
  return tf_inspect.stack()[1][2] - 1


class GuessIsTensorFlowLibraryTest(test_util.TensorFlowTestCase):

  def setUp(self):
    self.curr_file_path = os.path.normpath(os.path.abspath(__file__))

  def tearDown(self):
    ops.reset_default_graph()

  def testGuessedBaseDirIsProbablyCorrect(self):
    self.assertEqual("tensorflow",
                     os.path.basename(source_utils._TENSORFLOW_BASEDIR))

  def testUnitTestFileReturnsFalse(self):
    self.assertFalse(
        source_utils.guess_is_tensorflow_py_library(self.curr_file_path))

  def testSourceUtilModuleReturnsTrue(self):
    self.assertTrue(
        source_utils.guess_is_tensorflow_py_library(source_utils.__file__))

  def testFileInPythonKernelsPathReturnsTrue(self):
    x = constant_op.constant(42.0, name="x")
    self.assertTrue(
        source_utils.guess_is_tensorflow_py_library(x.op.traceback[-1][0]))

  def testNonPythonFileRaisesException(self):
    with self.assertRaisesRegexp(ValueError, r"is not a Python source file"):
      source_utils.guess_is_tensorflow_py_library(
          os.path.join(os.path.dirname(self.curr_file_path), "foo.cc"))


class SourceHelperTest(test_util.TensorFlowTestCase):

  def createAndRunGraphHelper(self):
    """Create and run a TensorFlow Graph to generate debug dumps.

    This is intentionally done in separate method, to make it easier to test
    the stack-top mode of source annotation.
    """

    self.dump_root = self.get_temp_dir()
    self.curr_file_path = os.path.abspath(
        tf_inspect.getfile(tf_inspect.currentframe()))

    # Run a simple TF graph to generate some debug dumps that can be used in
    # source annotation.
    with session.Session() as sess:
      self.u_init = constant_op.constant(
          np.array([[5.0, 3.0], [-1.0, 0.0]]), shape=[2, 2], name="u_init")
      self.u_init_line_number = line_number_above()

      self.u = variables.Variable(self.u_init, name="u")
      self.u_line_number = line_number_above()

      self.v_init = constant_op.constant(
          np.array([[2.0], [-1.0]]), shape=[2, 1], name="v_init")
      self.v_init_line_number = line_number_above()

      self.v = variables.Variable(self.v_init, name="v")
      self.v_line_number = line_number_above()

      self.w = math_ops.matmul(self.u, self.v, name="w")
      self.w_line_number = line_number_above()

      sess.run(self.u.initializer)
      sess.run(self.v.initializer)

      run_options = config_pb2.RunOptions(output_partition_graphs=True)
      debug_utils.watch_graph(
          run_options, sess.graph, debug_urls=["file://%s" % self.dump_root])
      run_metadata = config_pb2.RunMetadata()
      sess.run(self.w, options=run_options, run_metadata=run_metadata)

      self.dump = debug_data.DebugDumpDir(
          self.dump_root, partition_graphs=run_metadata.partition_graphs)
      self.dump.set_python_graph(sess.graph)

  def setUp(self):
    self.createAndRunGraphHelper()
    self.helper_line_number = line_number_above()

  def tearDown(self):
    if os.path.isdir(self.dump_root):
      shutil.rmtree(self.dump_root)
    ops.reset_default_graph()

  def testAnnotateWholeValidSourceFileGivesCorrectResult(self):
    source_annotation = source_utils.annotate_source(self.dump,
                                                     self.curr_file_path)

    self.assertIn(self.u_init.op.name,
                  source_annotation[self.u_init_line_number])
    self.assertIn(self.u.op.name, source_annotation[self.u_line_number])
    self.assertIn(self.v_init.op.name,
                  source_annotation[self.v_init_line_number])
    self.assertIn(self.v.op.name, source_annotation[self.v_line_number])
    self.assertIn(self.w.op.name, source_annotation[self.w_line_number])

    # In the non-stack-top (default) mode, the helper line should be annotated
    # with all the ops as well.
    self.assertIn(self.u_init.op.name,
                  source_annotation[self.helper_line_number])
    self.assertIn(self.u.op.name, source_annotation[self.helper_line_number])
    self.assertIn(self.v_init.op.name,
                  source_annotation[self.helper_line_number])
    self.assertIn(self.v.op.name, source_annotation[self.helper_line_number])
    self.assertIn(self.w.op.name, source_annotation[self.helper_line_number])

  def testAnnotateWithStackTopGivesCorrectResult(self):
    source_annotation = source_utils.annotate_source(
        self.dump, self.curr_file_path, file_stack_top=True)

    self.assertIn(self.u_init.op.name,
                  source_annotation[self.u_init_line_number])
    self.assertIn(self.u.op.name, source_annotation[self.u_line_number])
    self.assertIn(self.v_init.op.name,
                  source_annotation[self.v_init_line_number])
    self.assertIn(self.v.op.name, source_annotation[self.v_line_number])
    self.assertIn(self.w.op.name, source_annotation[self.w_line_number])

    # In the stack-top mode, the helper line should not have been annotated.
    self.assertNotIn(self.helper_line_number, source_annotation)

  def testAnnotateSubsetOfLinesGivesCorrectResult(self):
    source_annotation = source_utils.annotate_source(
        self.dump,
        self.curr_file_path,
        min_line=self.u_line_number,
        max_line=self.u_line_number + 1)

    self.assertIn(self.u.op.name, source_annotation[self.u_line_number])
    self.assertNotIn(self.v_line_number, source_annotation)

  def testAnnotateDumpedTensorsGivesCorrectResult(self):
    source_annotation = source_utils.annotate_source(
        self.dump, self.curr_file_path, do_dumped_tensors=True)

    # Note: Constant Tensors u_init and v_init may not get dumped due to
    #   constant-folding.
    self.assertIn(self.u.name, source_annotation[self.u_line_number])
    self.assertIn(self.v.name, source_annotation[self.v_line_number])
    self.assertIn(self.w.name, source_annotation[self.w_line_number])

    self.assertNotIn(self.u.op.name, source_annotation[self.u_line_number])
    self.assertNotIn(self.v.op.name, source_annotation[self.v_line_number])
    self.assertNotIn(self.w.op.name, source_annotation[self.w_line_number])

    self.assertIn(self.u.name, source_annotation[self.helper_line_number])
    self.assertIn(self.v.name, source_annotation[self.helper_line_number])
    self.assertIn(self.w.name, source_annotation[self.helper_line_number])

  def testCallingAnnotateSourceWithoutPythonGraphRaisesException(self):
    self.dump.set_python_graph(None)
    with self.assertRaises(ValueError):
      source_utils.annotate_source(self.dump, self.curr_file_path)

  def testCallingAnnotateSourceOnUnrelatedSourceFileDoesNotError(self):
    # Create an unrelated source file.
    unrelated_source_path = tempfile.mktemp()
    with open(unrelated_source_path, "wt") as source_file:
      source_file.write("print('hello, world')\n")

    self.assertEqual({},
                     source_utils.annotate_source(self.dump,
                                                  unrelated_source_path))

    # Clean up unrelated source file.
    os.remove(unrelated_source_path)


class ListSourceAgainstDumpTest(test_util.TensorFlowTestCase):

  def createAndRunGraphWithWhileLoop(self):
    """Create and run a TensorFlow Graph with a while loop to generate dumps."""

    self.dump_root = self.get_temp_dir()
    self.curr_file_path = os.path.abspath(
        tf_inspect.getfile(tf_inspect.currentframe()))

    # Run a simple TF graph to generate some debug dumps that can be used in
    # source annotation.
    with session.Session() as sess:
      loop_body = lambda i: math_ops.add(i, 2)
      self.traceback_first_line = line_number_above()

      loop_cond = lambda i: math_ops.less(i, 16)

      i = constant_op.constant(10, name="i")
      loop = control_flow_ops.while_loop(loop_cond, loop_body, [i])

      run_options = config_pb2.RunOptions(output_partition_graphs=True)
      debug_utils.watch_graph(
          run_options, sess.graph, debug_urls=["file://%s" % self.dump_root])
      run_metadata = config_pb2.RunMetadata()
      sess.run(loop, options=run_options, run_metadata=run_metadata)

      self.dump = debug_data.DebugDumpDir(
          self.dump_root, partition_graphs=run_metadata.partition_graphs)
      self.dump.set_python_graph(sess.graph)

  def setUp(self):
    self.createAndRunGraphWithWhileLoop()

  def tearDown(self):
    if os.path.isdir(self.dump_root):
      shutil.rmtree(self.dump_root)
    ops.reset_default_graph()

  def testGenerateSourceList(self):
    source_list = source_utils.list_source_files_against_dump(self.dump)

    # Assert that the file paths are sorted and unique.
    file_paths = [item[0] for item in source_list]
    self.assertEqual(sorted(file_paths), file_paths)
    self.assertEqual(len(set(file_paths)), len(file_paths))

    # Assert that each item of source_list has length 6.
    for item in source_list:
      self.assertTrue(isinstance(item, tuple))
      self.assertEqual(6, len(item))

    # The while loop body should have executed 3 times. The following table
    # lists the tensors and how many times each of them is dumped.
    #   Tensor name            # of times dumped:
    #   i:0                    1
    #   while/Enter:0          1
    #   while/Merge:0          4
    #   while/Merge:1          4
    #   while/Less/y:0         4
    #   while/Less:0           4
    #   while/LoopCond:0       4
    #   while/Switch:0         1
    #   while/Swtich:1         3
    #   while/Identity:0       3
    #   while/Add/y:0          3
    #   while/Add:0            3
    #   while/NextIteration:0  3
    #   while/Exit:0           1
    # ----------------------------
    #   (Total)                39
    #
    # The total number of nodes is 12.
    # The total number of tensors is 14 (2 of the nodes have 2 outputs:
    #   while/Merge, while/Switch).

    _, is_tf_py_library, num_nodes, num_tensors, num_dumps, first_line = (
        source_list[file_paths.index(self.curr_file_path)])
    self.assertFalse(is_tf_py_library)
    self.assertEqual(12, num_nodes)
    self.assertEqual(14, num_tensors)
    self.assertEqual(39, num_dumps)
    self.assertEqual(self.traceback_first_line, first_line)

  def testGenerateSourceListWithNodeNameFilter(self):
    source_list = source_utils.list_source_files_against_dump(
        self.dump, node_name_regex_whitelist=r"while/Add.*")

    # Assert that the file paths are sorted.
    file_paths = [item[0] for item in source_list]
    self.assertEqual(sorted(file_paths), file_paths)
    self.assertEqual(len(set(file_paths)), len(file_paths))

    # Assert that each item of source_list has length 4.
    for item in source_list:
      self.assertTrue(isinstance(item, tuple))
      self.assertEqual(6, len(item))

    # Due to the node-name filtering the result should only contain 2 nodes
    # and 2 tensors. The total number of dumped tensors should be 6:
    #   while/Add/y:0          3
    #   while/Add:0            3
    _, is_tf_py_library, num_nodes, num_tensors, num_dumps, _ = (
        source_list[file_paths.index(self.curr_file_path)])
    self.assertFalse(is_tf_py_library)
    self.assertEqual(2, num_nodes)
    self.assertEqual(2, num_tensors)
    self.assertEqual(6, num_dumps)

  def testGenerateSourceListWithPathRegexFilter(self):
    curr_file_basename = os.path.basename(self.curr_file_path)
    source_list = source_utils.list_source_files_against_dump(
        self.dump,
        path_regex_whitelist=(
            ".*" + curr_file_basename.replace(".", "\\.") + "$"))

    self.assertEqual(1, len(source_list))
    (file_path, is_tf_py_library, num_nodes, num_tensors, num_dumps,
     first_line) = source_list[0]
    self.assertEqual(self.curr_file_path, file_path)
    self.assertFalse(is_tf_py_library)
    self.assertEqual(12, num_nodes)
    self.assertEqual(14, num_tensors)
    self.assertEqual(39, num_dumps)
    self.assertEqual(self.traceback_first_line, first_line)


if __name__ == "__main__":
  googletest.main()
