Merge pull request #669 from ktbyers/develop

Release 2.0.1

Author: ktbyers

netmiko/__init__.py

@@ -21,7 +21,7 @@
 NetmikoTimeoutError = NetMikoTimeoutException
 NetmikoAuthError = NetMikoAuthenticationException
 
-__version__ = '2.0.0'
+__version__ = '2.0.1'
 __all__ = ('ConnectHandler', 'ssh_dispatcher', 'platforms', 'SCPConn', 'FileTransfer',
            'NetMikoTimeoutException', 'NetMikoAuthenticationException',
            'NetmikoTimeoutError', 'NetmikoAuthError', 'InLineTransfer', 'redispatch',

netmiko/_textfsm/__init__.py

@@ -0,0 +1,5 @@
+from netmiko._textfsm import _terminal
+from netmiko._textfsm import _texttable
+from netmiko._textfsm import _clitable
+
+__all__ = ('_terminal', '_texttable', '_clitable')

netmiko/_textfsm/_clitable.py

@@ -0,0 +1,380 @@
+"""
+Google's clitable.py is inherently integrated to Linux:
+
+This is a workaround for that (basically include modified clitable code without anything
+that is Linux-specific).
+
+_clitable.py is identical to Google's as of 2017-12-17
+_texttable.py is identical to Google's as of 2017-12-17
+_terminal.py is a highly stripped down version of Google's such that clitable.py works
+
+https://github.com/google/textfsm/blob/master/clitable.py
+"""
+
+# Some of this code is from Google with the following license:
+#
+# Copyright 2012 Google Inc. 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.
+
+import copy
+import os
+import re
+import threading
+import copyable_regex_object
+import textfsm
+from netmiko._textfsm import _texttable as texttable
+
+
+class Error(Exception):
+  """Base class for errors."""
+
+
+class IndexTableError(Error):
+  """General INdexTable error."""
+
+
+class CliTableError(Error):
+  """General CliTable error."""
+
+
+class IndexTable(object):
+  """Class that reads and stores comma-separated values as a TextTable.
+  Stores a compiled regexp of the value for efficient matching.
+  Includes functions to preprocess Columns (both compiled and uncompiled).
+  Attributes:
+    index: TextTable, the index file parsed into a texttable.
+    compiled: TextTable, the table but with compiled regexp for each field.
+  """
+
+  def __init__(self, preread=None, precompile=None, file_path=None):
+    """Create new IndexTable object.
+    Args:
+      preread: func, Pre-processing, applied to each field as it is read.
+      precompile: func, Pre-compilation, applied to each field before compiling.
+      file_path: String, Location of file to use as input.
+    """
+    self.index = None
+    self.compiled = None
+    if file_path:
+      self._index_file = file_path
+      self._index_handle = open(self._index_file, 'r')
+      self._ParseIndex(preread, precompile)
+
+  def __del__(self):
+    """Close index handle."""
+    if hasattr(self, '_index_handle'):
+      self._index_handle.close()
+
+  def __len__(self):
+    """Returns number of rows in table."""
+    return self.index.size
+
+  def __copy__(self):
+    """Returns a copy of an IndexTable object."""
+    clone = IndexTable()
+    if hasattr(self, '_index_file'):
+      # pylint: disable=protected-access
+      clone._index_file = self._index_file
+      clone._index_handle = self._index_handle
+
+    clone.index = self.index
+    clone.compiled = self.compiled
+    return clone
+
+  def __deepcopy__(self, memodict=None):
+    """Returns a deepcopy of an IndexTable object."""
+    clone = IndexTable()
+    if hasattr(self, '_index_file'):
+      # pylint: disable=protected-access
+      clone._index_file = copy.deepcopy(self._index_file)
+      clone._index_handle = open(clone._index_file, 'r')
+
+    clone.index = copy.deepcopy(self.index)
+    clone.compiled = copy.deepcopy(self.compiled)
+    return clone
+
+  def _ParseIndex(self, preread, precompile):
+    """Reads index file and stores entries in TextTable.
+    For optimisation reasons, a second table is created with compiled entries.
+    Args:
+      preread: func, Pre-processing, applied to each field as it is read.
+      precompile: func, Pre-compilation, applied to each field before compiling.
+    Raises:
+      IndexTableError: If the column headers has illegal column labels.
+    """
+    self.index = texttable.TextTable()
+    self.index.CsvToTable(self._index_handle)
+
+    if preread:
+      for row in self.index:
+        for col in row.header:
+          row[col] = preread(col, row[col])
+
+    self.compiled = copy.deepcopy(self.index)
+
+    for row in self.compiled:
+      for col in row.header:
+        if precompile:
+          row[col] = precompile(col, row[col])
+        if row[col]:
+          row[col] = copyable_regex_object.CopyableRegexObject(row[col])
+
+  def GetRowMatch(self, attributes):
+    """Returns the row number that matches the supplied attributes."""
+    for row in self.compiled:
+      try:
+        for key in attributes:
+          # Silently skip attributes not present in the index file.
+          # pylint: disable=E1103
+          if key in row.header and row[key] and not row[key].match(attributes[key]):
+            # This line does not match, so break and try next row.
+            raise StopIteration()
+        return row.row
+      except StopIteration:
+        pass
+    return 0
+
+
+class CliTable(texttable.TextTable):
+  """Class that reads CLI output and parses into tabular format.
+  Reads an index file and uses it to map command strings to templates. It then
+  uses TextFSM to parse the command output (raw) into a tabular format.
+  The superkey is the set of columns that contain data that uniquely defines the
+  row, the key is the row number otherwise. This is typically gathered from the
+  templates 'Key' value but is extensible.
+  Attributes:
+    raw: String, Unparsed command string from device/command.
+    index_file: String, file where template/command mappings reside.
+    template_dir: String, directory where index file and templates reside.
+  """
+
+  # Parse each template index only once across all instances.
+  # Without this, the regexes are parsed at every call to CliTable().
+  _lock = threading.Lock()
+  INDEX = {}
+
+  # pylint: disable=C6409
+  def synchronised(func):
+    """Synchronisation decorator."""
+
+    # pylint: disable=E0213
+    def Wrapper(main_obj, *args, **kwargs):
+      main_obj._lock.acquire()                  # pylint: disable=W0212
+      try:
+        return func(main_obj, *args, **kwargs)  # pylint: disable=E1102
+      finally:
+        main_obj._lock.release()                # pylint: disable=W0212
+    return Wrapper
+    # pylint: enable=C6409
+
+  @synchronised
+  def __init__(self, index_file=None, template_dir=None):
+    """Create new CLiTable object.
+    Args:
+      index_file: String, file where template/command mappings reside.
+      template_dir: String, directory where index file and templates reside.
+    """
+    # pylint: disable=E1002
+    super(CliTable, self).__init__()
+    self._keys = set()
+    self.raw = None
+    self.index_file = index_file
+    self.template_dir = template_dir
+    if index_file:
+      self.ReadIndex(index_file)
+
+  def ReadIndex(self, index_file=None):
+    """Reads the IndexTable index file of commands and templates.
+    Args:
+      index_file: String, file where template/command mappings reside.
+    Raises:
+      CliTableError: A template column was not found in the table.
+    """
+
+    self.index_file = index_file or self.index_file
+    fullpath = os.path.join(self.template_dir, self.index_file)
+    if self.index_file and fullpath not in self.INDEX:
+      self.index = IndexTable(self._PreParse, self._PreCompile, fullpath)
+      self.INDEX[fullpath] = self.index
+    else:
+      self.index = self.INDEX[fullpath]
+
+    # Does the IndexTable have the right columns.
+    if 'Template' not in self.index.index.header:    # pylint: disable=E1103
+      raise CliTableError("Index file does not have 'Template' column.")
+
+  def _TemplateNamesToFiles(self, template_str):
+    """Parses a string of templates into a list of file handles."""
+    template_list = template_str.split(':')
+    template_files = []
+    try:
+      for tmplt in template_list:
+        template_files.append(
+            open(os.path.join(self.template_dir, tmplt), 'r'))
+    except:         # noqa
+      for tmplt in template_files:
+        tmplt.close()
+      raise
+
+    return template_files
+
+  def ParseCmd(self, cmd_input, attributes=None, templates=None):
+    """Creates a TextTable table of values from cmd_input string.
+    Parses command output with template/s. If more than one template is found
+    subsequent tables are merged if keys match (dropped otherwise).
+    Args:
+      cmd_input: String, Device/command response.
+      attributes: Dict, attribute that further refine matching template.
+      templates: String list of templates to parse with. If None, uses index
+    Raises:
+      CliTableError: A template was not found for the given command.
+    """
+    # Store raw command data within the object.
+    self.raw = cmd_input
+
+    if not templates:
+      # Find template in template index.
+      row_idx = self.index.GetRowMatch(attributes)
+      if row_idx:
+        templates = self.index.index[row_idx]['Template']
+      else:
+        raise CliTableError('No template found for attributes: "%s"' %
+                            attributes)
+
+    template_files = self._TemplateNamesToFiles(templates)
+
+    try:
+      # Re-initialise the table.
+      self.Reset()
+      self._keys = set()
+      self.table = self._ParseCmdItem(self.raw, template_file=template_files[0])
+
+      # Add additional columns from any additional tables.
+      for tmplt in template_files[1:]:
+        self.extend(self._ParseCmdItem(self.raw, template_file=tmplt),
+                    set(self._keys))
+    finally:
+      for f in template_files:
+        f.close()
+
+  def _ParseCmdItem(self, cmd_input, template_file=None):
+    """Creates Texttable with output of command.
+    Args:
+      cmd_input: String, Device response.
+      template_file: File object, template to parse with.
+    Returns:
+      TextTable containing command output.
+    Raises:
+      CliTableError: A template was not found for the given command.
+    """
+    # Build FSM machine from the template.
+    fsm = textfsm.TextFSM(template_file)
+    if not self._keys:
+      self._keys = set(fsm.GetValuesByAttrib('Key'))
+
+    # Pass raw data through FSM.
+    table = texttable.TextTable()
+    table.header = fsm.header
+
+    # Fill TextTable from record entries.
+    for record in fsm.ParseText(cmd_input):
+      table.Append(record)
+    return table
+
+  def _PreParse(self, key, value):
+    """Executed against each field of each row read from index table."""
+    if key == 'Command':
+      return re.sub(r'(\[\[.+?\]\])', self._Completion, value)
+    else:
+      return value
+
+  def _PreCompile(self, key, value):
+    """Executed against each field of each row before compiling as regexp."""
+    if key == 'Template':
+      return
+    else:
+      return value
+
+  def _Completion(self, match):
+    # pylint: disable=C6114
+    r"""Replaces double square brackets with variable length completion.
+    Completion cannot be mixed with regexp matching or '\' characters
+    i.e. '[[(\n)]] would become (\(n)?)?.'
+    Args:
+      match: A regex Match() object.
+    Returns:
+      String of the format '(a(b(c(d)?)?)?)?'.
+    """
+    # Strip the outer '[[' & ']]' and replace with ()? regexp pattern.
+    word = str(match.group())[2:-2]
+    return '(' + ('(').join(word) + ')?' * len(word)
+
+  def LabelValueTable(self, keys=None):
+    """Return LabelValue with FSM derived keys."""
+    keys = keys or self.superkey
+    # pylint: disable=E1002
+    return super(CliTable, self).LabelValueTable(keys)
+
+  # pylint: disable=W0622,C6409
+  def sort(self, cmp=None, key=None, reverse=False):
+    """Overrides sort func to use the KeyValue for the key."""
+    if not key and self._keys:
+      key = self.KeyValue
+    super(CliTable, self).sort(cmp=cmp, key=key, reverse=reverse)
+  # pylint: enable=W0622
+
+  def AddKeys(self, key_list):
+    """Mark additional columns as being part of the superkey.
+    Supplements the Keys already extracted from the FSM template.
+    Useful when adding new columns to existing tables.
+    Note: This will impact attempts to further 'extend' the table as the
+    superkey must be common between tables for successful extension.
+    Args:
+      key_list: list of header entries to be included in the superkey.
+    Raises:
+      KeyError: If any entry in list is not a valid header entry.
+    """
+
+    for keyname in key_list:
+      if keyname not in self.header:
+        raise KeyError("'%s'" % keyname)
+
+    self._keys = self._keys.union(set(key_list))
+
+  @property
+  def superkey(self):
+    """Returns a set of column names that together constitute the superkey."""
+    sorted_list = []
+    for header in self.header:
+      if header in self._keys:
+        sorted_list.append(header)
+    return sorted_list
+
+  def KeyValue(self, row=None):
+    """Returns the super key value for the row."""
+    if not row:
+      if self._iterator:
+        # If we are inside an iterator use current row iteration.
+        row = self[self._iterator]
+      else:
+        row = self.row
+    # If no superkey then use row number.
+    if not self.superkey:
+      return ['%s' % row.row]
+
+    sorted_list = []
+    for header in self.header:
+      if header in self.superkey:
+        sorted_list.append(row[header])
+    return sorted_list