Welcome to NUAAL’s documentation!¶

This project aims to bring multiple ways of communicating with networking gear under one unified API. This should allow network engineers to gather information about the network configuration in a fast and simple manner. In the early stage, this project focuses mainly on retrieving the information from the devices, not so much on performing configuration changes.

Installation

You can install NUAAL either from Python package index PyPI or use the source code files available at GitHub. To install NUAAL by pip, simply type pip install nuaal in your terminal.

Usage

For specific usage examples please check out appropriate section of this documentation. A good starting point describing how to get structured data directly from routers and switches is Cisco_IOS_Cli.

Connections¶

This section describes various ways to communicate with network devices in order to pull configuration information.

CLI Connection¶

CLI Connections use widely used protocols, SSH and Telnet in order to communicate with network device. However, the CLI is made to be readable by humans, not so much by machines. In order to overcome this problem, we need to use some form of parsing the text outputs into more machine-friendly format. Nuaal contains parsing library which is able to produce structured JSON format from these text outputs. Each CLI Connection class is responsible for two key procedures:

Connecting to device, sending appropriate command and retrieve corresponding text output
Parse the text output by using Parsers library and return data in JSON format.

Each device type is represented by specific object. For example, to connect to Cisco IOS (IOS XE) device, you need to use the Cisco_IOS_Cli object. To make finding the correct object easier, you can use the GetCliHandler function.

GetCliHandler(device_type=None, ip=None, username=None, password=None, parser=None, secret=None, enable=False, store_outputs=False, DEBUG=False)¶

This function can be used for getting the correct connection object for specific device type.

Parameters:

device_type (str) – String representation of device type, such as cisco_ios
ip – (str) IP address or FQDN of the device you’re trying to connect to
username – (str) Username used for login to device
password – (str) Password used for login to device
parser – (ParserModule) Instance of ParserModule class which will be used for parsing of text outputs. By default, new instance of ParserModule is created.
secret – (str) Enable secret for accessing Privileged EXEC Mode
enable – (bool) Whether or not enable Privileged EXEC Mode on device
store_outputs – (bool) Whether or not store text outputs of sent commands
DEBUG – (bool) Enable debugging logging

Returns:

Instance of connection object

CliBaseConnection¶

class CliBaseConnection(ip=None, username=None, password=None, parser=None, secret=None, enable=False, store_outputs=False, DEBUG=False)¶

Bases: object

This class represents the base object, from which other (vendor specific classes) inherit. This class is basically a wrapper class around Kirk Byers’ excellent library, netmiko. Even though the netmiko library already provides pretty straightforward and easy way to access network devices, the CliBaseConnection tries to handle multiple events which can arise, such as:

Device is unreachable
Fallback to Telnet if SSH is not supported by device (and vice-versa)
Handles errors in outputs

Apart from the ‘send command, receive output’ this class also performs the parsing and storing outputs.

Parameters:

ip – (str) IP address or FQDN of the device you’re trying to connect to
username – (str) Username used for login to device
password – (str) Password used for login to device
parser – (ParserModule) Instance of ParserModule class which will be used for parsing of text outputs. By default, new instance of ParserModule is created.
secret – (str) Enable secret for accessing Privileged EXEC Mode
enable – (bool) Whether or not enable Privileged EXEC Mode on device
store_outputs – (bool) Whether or not store text outputs of sent commands
DEBUG – (bool) Enable debugging logging

_check_enable_level(device)¶

This function is called at the end of self._connect() to ensure that the connection is actually alive and that the proper privilege level is set.

Parameters:	device – (`Netmiko.ConnectHandler`) Instance of `netmiko.ConnectHandler`. If the connection is working, this will be set as `self.device`
Returns:	`None`

_command_handler(commands=None, action=None, out_filter=None, return_raw=False)¶

This function tries to send multiple ‘types’ of given command and waits for correct output. This should solve the problem with different command syntax, such as ‘show mac address-table’ vs ‘show mac-address-table’ on different versions of Cisco IOS. When correct output is returned, it is then parsed and the result is returned.

Parameters:	action (str) – Action to perform - has to be key of self.command_mappings commands (list) – List of command string to try, such as [‘show mac-address-table’, ‘show mac address-table’] out_filter – Instance of Filter class return_raw (bool) – If set to True, raw output will be returned.
Returns:	JSON representation of command output

_connect()¶

This function handles connection to device, if primary method fails, it will try to connect using secondary method.

Returns:	`None`

_connect_ssh()¶

This function tries to establish connection with device via SSH

Returns:	(`netmiko.ConnectHandler`) device

_connect_telnet()¶

This function tries to establish connection with device via Telnet

Returns:	(`netmiko.ConnectHandler`) device

_get_provider()¶

Creates provider dictionary for Netmiko connection

Returns:	`None`

_send_command(command, expect_string=None)¶

Parameters:	command (str) – Command to send to device
Returns:	Plaintext output of command from device

_send_commands(commands)¶

Sends multiple commands to device.

Parameters:	commands (list) – List of commands to run
Returns:	Dictionary with key=command, value=output_of_the_command

check_connection()¶

This function can be used to check state of the connection. Returns True if the connection is active and False if it isn’t.

Returns:	Bool value representing the connection state.

config_mode()¶

disconnect()¶

This function handles graceful disconnect from the device.

Returns:	`None`

get_arp()¶

Returns content of device ARP table in JSON format. In Cisco terms, this represents the command show ip arp.

Returns:	List of dictionaries.

get_interfaces()¶

This function returns JSON representation of all physical and virtual interfaces of the device, containing all available info about each interface. In Cisco terms, this represents usage of command show interfaces.

Returns:	List of dictionaries.

get_inventory()¶

This function return JSON representation of all installed modules and HW parts of the device. In Cisco terms, this represents the command show inventory.

Returns:	List of dictionaries.

get_license()¶

This function return JSON representation of licenses activated or installed on the device. In Cisco terms, this represents the show license command.

Returns:	List of dictionaries.

get_mac_address_table()¶

Returns content of device MAC address table in JSON format. In Cisco terms, this represents the command show mac address-table.

Returns:	List of dictionaries.

get_portchannels()¶

This function returns JSON representation of all logical bind interfaces (etherchannels, portchannels). In Cisco terms, this represents the show etherchannel summary command.

Returns:	List of dictionaries.

get_version()¶

Returns JSON representation of basic device information, such as vendor, device platform, software version etc. In Cisco terms, this represents the command show version.

Returns:	List of dictionaries.

get_vlans()¶

This function returns JSON representation of all VLANs enabled on the device, together with list of assigned interfaces. In Cisco terms, this represents the show vlan brief command.

Returns:	List of dictionaries.

store_raw_output(command, raw_output, ext='txt')¶

This function is used for storing the plaintext output of the commands called on the device in separate files. Used mainly for debugging and development purposes. This function is only called if the store_outputs parameter is set to True.

Parameters:	command (str) – Command string executed on the device. raw_output (str) – Plaintext output of the command. ext (str) – Extension of the file, “.txt” by default.
Returns:	`None`

Cisco_IOS_Cli¶

This class provides low-level connection to Cisco networking devices running Cisco IOS and IOS XE. In order for this connection to work, SSH or Telnet must be enabled on the target device. After creating connection object and connecting to the device using either Python’s Context Manager or by calling _connect() method, you can start retrieving structured data by calling get_ functions. To see other supported get_ functions, please check out the documentation page of the parent object CliBaseConnection.

Example usage:

>>> from nuaal.connections.cli import Cisco_IOS_Cli
>>> # For further easier manipulation, create provider dictionary
>>> provider = {
    "username": "admin",    # Username for authentication
    "password": "cisco",    # Password for authentication
    "enable": True,         # Whether or not enable Privileged EXEC Mode
    "secret": "cisco",      # Enable secret for entering Privileged EXEC Mode
    "store_outputs": True,  # Enables saving Plaintext output of commands
    "method": "ssh"         # Optional, defaults to "ssh"
}
>>>
>>> # Create variable for storing data
>>> data = None
>>> # Establish connection using Context Manager
>>> with Cisco_IOS_Cli(ip="192.168.1.1", **provider) as ios_device:
>>>     # Run selected commands
>>>     ios_device.get_interfaces()
>>>     ios_device.get_vlans()
>>>     ios_device.get_trunks()
>>>     ios_device.get_version()
>>>     ios_device.get_inventory()
>>>     # Store data to variable
>>>     data = ios_device.data
>>> # Do other fancy stuff with data
>>> print(data)

Defined get_* functions return output in JSON format (except for get_config()). You can also send your own commands, such as:

>>> with Cisco_IOS_Cli(ip="192.168.1.1", **provider) as ios_device:
>>>     ios_device._send_command(command="show version")

And you will receive Plaintext output of selected command.

class Cisco_IOS_Cli(ip=None, username=None, password=None, parser=None, secret=None, method='ssh', enable=False, store_outputs=False, DEBUG=False)¶

Bases: nuaal.connections.cli.CliBase.CliBaseConnection

Object for interaction with network devices running Cisco IOS (or IOS XE) software via CLI interface.

Parameters:

ip – (str) IP address or FQDN of the device you’re trying to connect to
username – (str) Username used for login to device
password – (str) Password used for login to device
parser – (ParserModule) Instance of ParserModule class which will be used for parsing of text outputs. By default, new instance of ParserModule is created.
secret – (str) Enable secret for accessing Privileged EXEC Mode
method – (str) Primary method of connection, ‘ssh’ or ‘telnet’. (Default is ‘ssh’)
enable – (bool) Whether or not enable Privileged EXEC Mode on device
store_outputs – (bool) Whether or not store text outputs of sent commands
DEBUG – (bool) Enable debugging logging

get_auth_sessions()¶

Returns:

get_auth_sessions_intf(interface=None)¶

Parameters:	interface (str) – Name of the interface to retrieve auth session from
Returns:

get_config()¶

Function for retrieving current configuration of the device.

Return str:	Device configuration

get_mac_address_table(vlan=None, interface=None)¶

Returns content of device MAC address table in JSON format. In Cisco terms, this represents the command show mac address-table.

Parameters:	vlan (int) – Number of VLAN to get MAC addresses from
Returns:	List of dictionaries.

get_neighbors(output_filter=None, strip_domain=False)¶: Function to get neighbors of the device with possibility to filter neighbors :param output_filter: (Filter) Instance of Filter class, used to filter neighbors, such as only “Switch” or “Router” :param strip_domain: (bool) Whether or not to strip domain names and leave only device hostname :return: List of dictionaries

get_trunks(expand_vlan_groups=False)¶: Custom parsing function for output of “show interfaces trunk” :param expand_vlan_groups: (bool) Whether or not to expand VLAN ranges, for example ‘100-102’ -> [100, 101, 102] :return: List of dictionaries

CliMultiRunner¶

class CliMultiRunner(provider, ips, actions=None, workers=4, DEBUG=False)¶

Bases: object

This class allows running set of CLI commands on multiple devices in parallel, using Worker threads

Parameters:	provider (dict) – Dictionary with necessary info for creating connection ips (list) – List of IP addresses of the device actions (list) – List of actions to be run in each connection workers (int) – Number of worker threads to spawn DEBUG (bool) – Enables/disables debugging output

fill_queue()¶

This function builds device-specific providers for CliConnection and adds them to Queue object.

Returns:	`None`

run(adjust_worker_count=True)¶

Main entry function, puts all pieces together. Firs populates Queue with IP addreses and connection information, spawns threads and starts them. Blocks until self.queue is empty.

Parameters:	adjust_worker_count (bool) – If set to True (default), number of workers will be reduced if number of given hosts is lower than number of workers.
Returns:

thread_factory()¶

Function for spawning worker threads based on number of workers in self.workers

Returns:

worker()¶

Worker function to handle individual connections. Based on provider object from Queue establishes connection to device and runs defined set of commands. Received data are stored in self.data as a list of dictionaries, each dictionary representing one device.

Returns:	`None`

REST Connections¶

REST API Connections are used for communication with various network controllers, vedor-specific APIs and network devices, which support this method of communication.

RestBase Connection¶

class RestBase(url, username=None, password=None, api_base_path=None, verify_ssl=False, DEBUG=False, con_type=None)¶

Bases: object

Parent class for all REST-like connections

Parameters:

url – URL or IP address of the target machine
username – Username for authentication
password – Password for authentication
api_base_path – Base path for the API resource, such as “/api/v1”
verify_ssl – Enable SSL certificate verification. For self-signed certificates, set this to False
DEBUG – Enable debugging output
con_type – String representation of connection type, set by child classes

_authorize()¶

Connection-specific function for handling authorization. Overridden by child classes

Returns:	`None`

_delete(path, params)¶

Wrapper function for DELETE method of the requests library

Parameters:	path – Path of the API resource used in URL params – Parameters for the request
Returns:	Instance of `requests` response object

_get(path, params=None)¶

Wrapper function for GET method of the requests library

Parameters:	path – Path of the API resource used in URL params – Parameters for the request
Returns:	Instance of `requests` response object

_initialize()¶

Function for credentials loading and session preparation. Might be overwritten in child classes

Returns:	`None`

_post(path, data=None, files=None, params=None)¶

Wrapper function for POST method of the requests library

Parameters:	path – Path of the API resource used in URL data – Data payload for POST request. JSON string files (dict) – Dictionary with files to upload params – Parameters for the request
Returns:	Instance of `requests` response object

_put(path, data=None, files=None, params=None)¶

Wrapper function for PUT method of the requests library

Parameters:	path – Path of the API resource used in URL data – Data payload for POST request. JSON string params – Parameters for the request
Returns:	Instance of `requests` response object

_response_handler(response)¶

Function for handling request’s response objects. Main purpose of this action is to handle HTTP return codes. In case of JSON formatted reply, returns this data as dictionary. In case of errors, either string representation of data is returned, or None. Status code is returned alongside the content to allow further processing if needed.

Parameters:	response – Instance of request’s response object.
Returns:	content, status code

APIC-EM Base Connection¶

class ApicEmBase(url, username=None, password=None, api_base_path='/api/v1', verify_ssl=True, DEBUG=False)¶

Bases: nuaal.connections.api.RestBase.RestBase

Object providing access to Cisco’s APIC-EM REST-API.

Parameters:	url – URL of the APIC-EM, such as ‘https://sandboxapicem.cisco.com’ username – Username for authentication password – Password for authentication api_base_path – Base path for version-1 API verify_ssl – Enable/disable verification of SSL Certificate DEBUG – Enable/disable debugging output

_authorize()¶

Function for obtaining authorization “Service Ticket” from the APIC-EM. This function is called when HTTP Status Code 401 (Unauthorized) is returned.

Returns:	`None`

_load_credentials()¶

Function for loading credentials information stored in data/apicem_credentials.json file.

Returns:	`None`

_store_credentials()¶

Function for storing credentials information in data/apicem_credentials.json file. This function is called after successfully obtaining Service Ticket

Returns:	`None`

check_file(fileId=None, namespace=None, file_name=None)¶

Function for checking whether given file (based on it’s name or ID) exists on the APIC-EM. Can be used for checking configuration or template files.

Parameters:	fileId (str) – ID string of the file in APIC-EM’s database namespace (str) – APIC-EM’s namespace, under which the file should be located file_name (str) – Name of the file
Return str:	FileID

delete(path, params=None)¶

Parameters:	path (str) – Path of API resource params (dict) – Dictionary of parameters for request
Returns:	Dictionary representation of response

delete_file(fileId=None, namespace=None, filename=None)¶

Function for deleting file from APIC-EM’s database based on it’s ID

Parameters:	fileId (str) – ID string of the file in APIC-EM’s database namespace (str) – APIC-EM’s namespace, under which the file should be located filename (str) – Name of the file
Return bool:

get(path, params=None)¶

Function providing HTTP GET method for retrieving data from APIC-EM API.

Parameters:	path – Path of API resource, such as “/network-device”. Each path must begin with “/” forward-slash character params – Dictionary of parameters for request, such as {“deviceId”: “<ID of device in APIC-EM database>”}
Returns:	Dictionary representation of response content under “response” key, eg. <request_response_object>show_ip_route.json()[“response”] or `None`

post(path, data=None, files=None, params=None)¶

Function providing HTTP POST method for sending data to APIC-EM API.

Parameters:	path (str) – Path of API resource, such as “/ticket”. Each path must begin with “/” forward-slash character data (json) – JSON string data payload files (dict) – Dictionary with files to upload params – Dictionary of parameters for request, such as {“deviceId”: “<ID of device in APIC-EM database>”}
Returns:	Dictionary representation of response content under “response” key, eg. <request_response_object>show_ip_route.json()[“response”] or `None`

put(path, data=None, files=None, params=None)¶

Function providing HTTP PUT method for sending data to APIC-EM API.

Parameters:	path (str) – Path of API resource data (json) – JSON string data payload files (dict) – Dictionary with files to upload params (dict) – Dictionary of parameters for request, such as {“deviceId”: “<ID of device in APIC-EM database>”}
Returns:	Dictionary representation of response content under “response” key, eg. <request_response_object>show_ip_route.json()[“response”] or `None`

task_handler(taskId, timeout=2, max_retries=2)¶

Function for handling Task results, based on taskId. This function periodically queries APIC-EM for the results of given task until task is either completed or timeout is reached. Maximum time this function waits for result is (timeout * max_retries) seconds.

Parameters:	taskId (str) – ID of the task, returned by the APIC-EM after starting task. timeout (int) – Number of seconds to wait after each unsuccessful request max_retries (int) – Maximum number of requests.
Return str:	ID of the result

upload_file(namespace, file_path)¶

Function for uploading file to APIC-EM’s database.

Parameters:	namespace (str) – APIC-EM’s namespace, under which the file should be uploaded file_path (str) – Path to the file on local machine
Return str:	FileID of the uploaded file

Parsers¶

This section describes classes for parsing CLI outputs of network devices to structured objects - dictionaries.

CLI Parsers¶

ParserModule¶

ParserModule(object)

This class represents the base object, from which other (vendor specific classes) inherit. This class provides basic set of functions which handle parsing of raw text outputs based on Python’s re module and regex strings provided by Patterns class.

The core idea behind ParserModule is that the complexity of various command outputs differ. Some outputs, such as ‘show mac address-table’ are simple enough to be handled by single regex pattern. On the other hand, some outputs, such as ‘show interfaces’ are way more complex and would require a very long and complex regex patterns to match. Also, every little change in the output would cause this pattern not to match. To avoid the usage of overly complex regex patterns, the parsing can be divided into two steps, or levels. In the first level, the text output is ‘pre-processed’, for example the output of show interfaces is splitted to list of strings, where each string represents a single interface. In the second level, each of these strings can be processed using multiple patterns, resulting in final dictionary representing the interface. For some outputs, these two levels can “overlap”, meaning that the first level can already return a dictionary, but some of the keys need to be ‘post-processed’ by the second level. A great example of such command is ‘show vlan brief’, where the first level returns a list of dictionaries with keys [“vlan_id”, “name”, “ports”]. The value of “`”ports”` (which is a string of all ports assigned to this VLAN) can be further processed by second level, which converts this string to a list of individual ports.

Base Functions

match_single_pattern(self, text, pattern) - This function tries to match a single regex pattern on given text string. This function operates in two ‘modes’: with or without named groups in regex pattern. If pattern contains at least one named group (for example r"^(?P<name_of_the_group>.*)"), the function will return list of dictionaries, where each dictionary has “name_of_the_group” as key and whatever the .* matched as value. If pattern does not contain any named group, list of strings is returned, each string being one match of the pattern (basically re.findall(pattern=pattern, string=text)).
update_entry(self, orig_entry, new_entry) - This function simply updates dict orig_entry with dict new_entry. The changes are made only for keys, that are not in the orig_entry or those, which value is None. The updated dictionary is returned.
match_multi_pattern(self, text, patterns) - This function uses multiple regex patterns to match against given text. At the beginning, a new dictionary is created with named groups of ALL the patterns as keys and values None. Each time one of the patterns matches, the resulting dictionary is updated.
_level_zero(self, text, patterns) - This function tries to match a pattern from patterns until a match is found. Then based on the self.match_single_pattern(**kwargs) returns either list of strings, or list of dictionaries. This function is used either for matching ‘simple’ outputs or for pre-processing (and post-processing) of more complex outputs.
_level_one(self, text, command) - Given the command variable (which represents the command used to get output), it determines the level of the command and fetches corresponding patterns from self.patterns["level0"][command] (an instance of Patterns class). If the level is 0, it simply returns the output of self._level_zero(text, patterns). If the level is 1, it continues to process individual entries returned by _level_zero based on patterns from self.patterns["level1"][command]. Return a list of dictionaries.
autoparse(self, text, command) - The main entry point for parsing, given just the text output and command it determines the proper way to parse the output and returns result.

class ParserModule(device_type, DEBUG=False)¶

Bases: object

This class provides necessary functions for parsing plaintext output of network devices. Uses patterns from PatternsLib for specified device type. The outputs are usually lists of dictionaries, which contain keys based on name groups of used regex patterns.

Parameters:	device_type (str) – String representation of device type, such as cisco_ios DEBUG (bool) – Enables/disables debugging output

_level_one(text, command)¶

This function handles parsing of more complex plaintext outputs. First, the output of _level_zero() function is retrieved and then further parsed.

Parameters:	text (str) – Plaintex output of given `command`, which will be parsed command (str) – Command string used to generate the output
Returns:	List of dictionaries

_level_zero(text, patterns)¶

This function handles parsing of less complex plaintext outputs, which can be parsed in one step.

Parameters:	text (str) – Plaintex output which will be parsed patterns – List of compiled regex patterns, which are used to parse the `text`
Returns:	List dics (if `patterns` contain named groups) or list of strings (if they don’t)

autoparse(text, command)¶

The main entry point for parsing, given just the text output and command it determines the proper way to parse the output and returns result.

Parameters:	text (str) – Text output to be processed command (str) – Command used to generate `text` output. Based on this parameter, correct regex patterns are selected.
Returns:	List of found entities, usually list of dictionaries

command_mapping(command)¶

This function determines the max_level of command - based on level of complexity of the output, the parsing is processed in 1 or 2 steps. Used for autoparse

Parameters:	command (str) – Command used to generate the output, eg. show vlan brief
Returns:	(str) Highest level of specified command (top PatternsLib Key)

match_multi_pattern(text, patterns)¶

This functions tries to match multiple regex patterns against given text .

Parameters:	text (str) – Text output to be processed patterns (lst) – List of `re` compiled patterns for parsing.
Returns:	Dictionary with names of all groups from all `patterns` as keys, with matching strings as values.

match_single_pattern(text, pattern)¶

This function tries to match given regex pattern against given text. If pattern contains named groups, list of dictionaries with these groups as keys is returned. If pattern does not contain any named groups, list of matching strings is returned.

Parameters:	text (str) – pattern – `re` compiled regex pattern
Returns:	List of matches, either dictionaries or strings

update_entry(orig_entry, new_entry)¶

This function simply updates dictionary orig_entry with keys and values from new_entry. Only None values in orig_entry are updated. Keys with value None from new_entry are also used in order to ensure coherent output.

Parameters:	orig_entry (dict) – Original dictionary to be updated based on entries in `new_entry` new_entry (dict) – New dictionary containing new data which should be added to `orig_entry`
Returns:	Updated dictionary

class CiscoIOSParser(DEBUG=False)¶

Bases: nuaal.Parsers.Parser.ParserModule

Child class of ParserModule designed for cisco_ios device type.

trunk_parser(text)¶

Function specifically designed for parsing output of show interfaces trunk command.

Parameters:	text (str) – Plaintext output of show interfaces trunk command.
Returns:	List of dictionaries representing trunk interfaces.

vlanGroup_check(vlanGroup)¶

Models¶

Models are high-level representation of network entities, such as devices, interfaces, network topologies etc. The main purpose of these models is to provide single unified interface producing outputs of specified structure, no matter what kind of connection is used on the lower level. This helps overcome issues with different dictionary structures, names of methods and more. Because each type of connection (CLI, REST API, Network Controller) provides structured, but always slightly different format of data, there exists a model for each type of connection. This model then converts connection specific data structures to those defined in BaseModel classes.

BaseModels¶

class BaseModel(name=None, DEBUG=False)¶

Bases: object

This is a parent object that all high-level API models inherit from.

Parameters:	name – DEBUG –

class DeviceBaseModel(name='DeviceBaseModel', DEBUG=False)¶

Bases: nuaal.Models.BaseModels.BaseModel

This is a parent object for device models.

Parameters:	name – DEBUG –

get_interfaces()¶

Returns:

get_neighbors()¶

Returns:

get_vlans()¶

Returns:

Cisco_IOS_Model¶

class CiscoIOSModel(cli_connection=None, DEBUG=False)¶

Bases: nuaal.Models.BaseModels.DeviceBaseModel

High-level abstraction model for Cisco IOS devices.

Parameters:	cli_connection – Instance of `Cisco_IOS_Cli` connection object. DEBUG (bool) – Enables/disables debugging output.

_interface_update()¶

Internal function for retrieving needed data to build complete interface representation.

Returns:	`None`

_map_interface(interface)¶

Internal function for changing the format of interface dictionary representation.

Parameters:	interface (dict) – Dictionary representation of interface in a format provided by connection object’s `get_interfaces()` function.
Returns:	Dictionary representation interface in common format.

get_interfaces()¶

Retrieves list of all interfaces in common format.

Returns:	List of dictionaries.

get_inventory()¶

Retrieves list of all installed HW parts on device in common format.

Returns:	List of dictionaries.

get_l2_interfaces()¶

Retrieves list of L2 (switched) interfaces in common format.

Returns:	List of dictionaries.

get_l3_interfaces()¶

Retrieves list of L3 (routed) interfaces in common format.

Returns:	List of dictionaries.

get_vlans()¶

Retrieves list of all configured VLANs on device in common format.

Returns:	List of dictionaries.

ApicEmModels¶

class ApicEmDeviceModel(apic=None, object_id=None, filter=None, DEBUG=False)¶

Bases: nuaal.Models.BaseModels.DeviceBaseModel

Parameters:	apic – object_id – filter – DEBUG –

_initialize()¶

Returns:

get_interfaces()¶

Returns:

get_inventory()¶

Returns:

get_vlans()¶

Returns:

Lets look at the following example: In the first phase, we create two different connections, one being Cisco_IOS_Cli and the second being ApicEmBase:

>>> import json
>>> from nuaal.connections.cli import Cisco_IOS_Cli
>>> from nuaal.connections.api import ApicEmBase

>>> device1 = Cisco_IOS_Cli(**provider)
>>> device2 = ApicEmBase(url="https://sandboxapicem.cisco.com")

Both of these ‘devices’ have completely different functions and data structures. In order to get interfaces of the device1, one would simply call:

>>> interfaces_1 = device1.get_interfaces()
>>> # Print just the first interface for brevity
>>> for interface in interfaces_1[:1]:
>>> print(json.dumps(interface, indent=2))
{
 "name": "FastEthernet0",
 "status": "up",
 "lineProtocol": "up",
 "hardware": "Fast Ethernet",
 "mac": "1cdf.0f45.52e0",
 "bia": "1cdf.0f45.52e0",
 "description": "MGMT",
 "ipv4Address": null,
 "ipv4Mask": null,
 "loadInterval": "5 minute",
 "inputRate": 1000,
 "inputPacketsInterval": 1,
 "outputRate": 1000,
 "outputPacketsInterval": 1,
 "duplex": "Full",
 "speed": null,
 "linkType": null,
 "mediaType": null,
 "sped": "100Mb/s",
 "mtu": 1500,
 "bandwidth": 100000,
 # .
 # <Output ommited>
 # .
 "outputBufferSwappedOut": 0
}
>>>

But for the device2 (which isn’t actually single device, but a controller with many devices), we would run:

>>> # Presume already knowing the id of device
>>> interfaces_2 = device2.get(path="/interface/network-device/<deviceId>")
>>> for interface in interfaces[:1]:
>>> print(json.dumps(interface, indent=2))
{
   "className": "SwitchPort",
   "description": "",
   "interfaceType": "Physical",
   "speed": "1000000",
   "adminStatus": "UP",
   "macAddress": "70:81:05:42:1e:b3",
   "ifIndex": "43",
   "status": "down",
   "voiceVlan": null,
   "portMode": "dynamic_auto",
   "portType": "Ethernet Port",
   "lastUpdated": "2018-05-02 14:53:01.67",
   "portName": "GigabitEthernet5/36",
   "ipv4Address": null,
   "ipv4Mask": null,
   "isisSupport": "false",
   "mappedPhysicalInterfaceId": null,
   "mappedPhysicalInterfaceName": null,
   "mediaType": "10/100/1000-TX",
   "nativeVlanId": "1",
   "ospfSupport": "false",
   "serialNo": "FOX1524GV2Z",
   "duplex": "AutoNegotiate",
   "series": "Cisco Catalyst 4500 Series Switches",
   "pid": "WS-C4507R+E",
   "vlanId": "1",
   "deviceId": "c8ed3e49-5eeb-4dee-b120-edeb179c8394",
   "instanceUuid": "0054cc51-ea16-471c-a634-5788220ff3f3",
   "id": "0054cc51-ea16-471c-a634-5788220ff3f3"
}
>>>

Apparently, both the provided information and data structure is different. To combine these data to single uniform database. This is where models come in. We will continue based on previous example, right after defining connections: device1 and device2. From there on, we can create models:

>>> from nuaal.Models import Cisco_IOS_Model, ApicEmDeviceModel
>>> model1 = Cisco_IOS_Model(cli_connection=device1)
>>> model2 = ApicEmDeviceModel(apic=device2)

Writers¶

This section describes classes for writing data in various formats, such as CSV or Excel files.

Writer¶

class Writer(type, DEBUG=False)¶

Bases: object

This object handles writing structured data in JSON format in tabular formats, such as CSV or Microsoft Excel (.xlsx).

Parameters:	type (str) – String representation of writer type, used in logging messages. DEBUG (bool) – Enables/disables debugging output.

_get_headers(data)¶: This function returns sorted list of column headers (dictionary keys). :param list|dict data: List or dict of dictionaries containing common keys. :return: List of headers.

combine_data(data)¶

Function for combining data from multiple sections. Each section represents data gathered by some of the get_ functions. Each returned dataset includes common headers identifying device, from which the data originates.

Parameters:	data (list) – List of dictionaries, content of single section
Returns:	(list) section_headers, (list) section_content

combine_device_data(data)¶

json_to_lists(data)¶

This function transfers list of dictionaries into two lists, one containing the column headers (keys of dictionary) and the other containing individual list of values (representing rows).

Parameters:	data (list) – List of dictionaries with common structure
Returns:	Dict with “headers” list and “list_data” list containing rows.

ExcelWriter¶

class ExcelWriter¶

Bases: nuaal.Writers.Writer.Writer

This class provides functions for writing the retrieved data in Microsoft Excel format, .xlsx.

create_workbook(path, filename)¶

Function for creating Excel Workbook based on path and file name.

Parameters:	path (str) – System path to Excel file filename (str) – Name of the Excel file.
Returns:	Instance of `xlsxwriter` workbook object.

write_data(workbook, data)¶: Function for writing entire content of device data, divided into sections based on get_ command used. :param workbook: Reference of the xlsxwriter workbook object. :param dict data: Content of device.data variable, which holds all retrieved info. :return: None

write_json(workbook, data, worksheetname=None, headers=None)¶

Function for writing JSON-like data to worksheet.

Parameters:	workbook – Reference of the `xlsxwriter` workbook object. data – worksheetname (str) – Name of the worksheet headers (list) – List of column headers.
Returns:	`None`

write_list(workbook, data, worksheetname=None, headers=None)¶

Function for creating worksheet inside given workbook and writing provided data.

Parameters:	workbook – Reference of the `xlsxwriter` workbook object. data (list) – List of lists, where each list represents one row in the worksheet. worksheetname (str) – Name of the worksheet. headers (list) – List of column headers.
Returns:	`None`

Discovery¶

This module provides classes for network discovery. Discovery can be performed by two ways:

Using one device as seed for discovery based on discovery protocols
Using list of IP addresses of all devices in the network

Note

Both mentioned ways rely on neighbor discovery protocols, which needs to be enabled in the network, such as CDP or LLDP. Without information provided by these protocols, it is impossible to reconstruct the network topology.

IP_Discovery¶

This class performs discovery of network devices based on known IP addresses. Can be used in scenarios where you want only specific devices to be discovered or when discovery protocols are not enabled in given network.

Neighbor_Discovery¶

This class performs discovery of network devices based on seed device’s IP address. IP_Discovery

Note

In order for this discovery method to work, all network devices must have CDP (or LLDP) discovery protocol enabled on all links which connect to other devices. Also make sure that the advertised IP address is the IP address intended for device management and is reachable from the node you’re running NUAAL on.

Topology¶

Topology objects are used to build JSON representation of network topologies based on information of device neighbors. These classes use the get_neighbors() function of low-level connection classes, such as Cisco_IOS_Cli.

CliTopology¶

Utils¶

get_logger(name, DEBUG=False, handle=['stderr'])¶

This function provides common logging facility by creating instances of loggers from python standard logging library.

Parameters:	name (str) – Name of the logger DEBUG (bool) – Enables/disables debugging output handle (list) – Changing value of this parameter is not recommended.
Returns:	Instance of logger object

interface_split(interface)¶: Function for splitting names of interfaces to interface type and number. Example: FastEthernet0/18 -> FastEthernet, 0/18 :param str interface: Interface name. :return: Interface type, interface number

vlan_range_shortener(full_vlan_list)¶

Function for shortening list of allowed VLANs on trunk interface. Example: [1,2,3,4,5] -> [“1-5”]. Reverse function is vlan_range_expander.

Parameters:	full_vlan_list – List of integers representing VLAN numbers.
Returns:	List of strings.

vlan_range_expander(all_vlans)¶

Function for expanding list of allowed VLANs on trunk interface. Example: 1-4096 -> range(1, 4097). Can be used when trying to figure out whether certain VLAN is allowed or not. Reverse function is vlan_range_shortener.

Parameters:	all_vlans – Either list ([“1-10”, “15”, “20-30”]) or string (“1-10,15,20-30”) of VLAN range.
Returns:	List of VLAN numbers (integers).

int_name_convert(int_name, out_type=None)¶

Function for converting long interface names to short and vice versa. Example: “GigabitEthernet0/12” -> “Gi0/12” and “Gi0/12” -> “GigabitEthernet0/12”

Parameters:	int_name (str) – Interface name out_type (str) – Desired form of interface name, either “long” or “short”. If None, return opposite form
Returns:	Interface name

mac_addr_convert(mac_address='')¶

Function for providing single format for MAC addresses.

Parameters:	mac_address (str) – MAC address to be converted.
Returns:	MAC address in format XX:XX:XX:XX:XX:XX.

update_dict(orig_dict, update_dict)¶

Function for updating dictionary values.

Parameters:	orig_dict (dict) – Dictionary to be updated. update_dict (dict) – Dictionary to update from.
Returns:	Updated dictionary.

check_path(path, create_missing=True)¶

Function for checking path availability, returns path if specified folder exists, False otherwise. Can also create missing folders. Used for handling absolute and relative paths.

Parameters:	path (str) – Path of the folder. create_missing (bool) – Whether or not to create missing folders.
Returns:	Bool

Filter¶

class Filter(required={}, excluded={}, exact_match=True, DEBUG=False)¶

Bases: object

Object for making filtering of required field easier.

This class finds elements in JSON-like format based on provided values.

Parameters:

required (dict) – Dictionary of required keys. Example: {“key1”: “value1”} will return only those dictionaries, which key “key1” contains the value “value1”. You can also use list of required values, such as {“key1”: [“value1”, “value2”]} together with option exact_match=False.
excluded (dict) – Dictionary of excluded keys. Example: {“key1”: “value1”} will return only those dictionaries, which key “key1” does not contain the value “value1”. You can also use list of excluded values, such as {“key1”: [“value1”, “value2”]} together with option exact_match=False.
exact_match (bool) – Specifies whether the filter value must match exactly, or partially.
DEBUG – Enables/disables debugging output.

dict_cleanup(data)¶

Function for filtering dictionary structures (eg. dictionary where values are also dictionaries).

Parameters:	data (dict) – Dictionary containing dicts as values, which you want to filter.
Returns:	Filtered dictionary.

list_cleanup(data)¶

Function for filtering list structures (eg. list of dictionaries).

Parameters:	data (list) – List of dictionaries, which you want to filter.
Returns:	Filtered list of dictionaries.

universal_cleanup(data=None)¶

This function calls proper cleanup function base on data type.

Parameters:	data – Data to be filtered, either list of dictionaries or dictionary of dictionaries.
Returns:	Filtered data

OutputFilter¶

class OutputFilter(data=None, required=[], excluded=[])¶

Bases: object

This class helps to minimize dictionary structure by specifying only the desired keys.

Parameters:

data – Data to be filtered.
required (list) – List of required keys. Returned entries will contain only these specified keys. Example: {“key1”: “value1”, “key2”: “value2”} with required [“key1”] will only return {“key1”: “value1”}.
excluded (list) – List of excluded keys. Returned entries will not contain these specified keys. Example: {“key1”: “value1”, “key2”: “value2”} with excluded [“key1”] will only return {“key2”: “value2”}.

get()¶

After instantiating object, call this function to retrieve filtered data.

Returns:	Filtered data.