NapalmMultipleDevices

from napalm import get_network_driver
from netmiko.ssh_exception import NetMikoTimeoutException
from paramiko.ssh_exception import SSHException
from netmiko.ssh_exception import AuthenticationException


def devices():
    with open('devices') as f:
        devices_list = f.read().splitlines()
        return devices_list


def user_pass():
    username = input("enter your username: ")
    password = input("enter your password: ")
    return username, password


def commands():
    with open('commands') as f:
        commands_to_send = f.read()
        return commands_to_send


def main():
    print("Devices to be configured: ")
    print(devices())
    print("*" * 100)
    print("Currently loaded configuration:\n")
    print(commands())
    print("\n")

    u, p = user_pass()

    for device in devices():

        try:
            driver = get_network_driver('ios')
            ios = driver(device, u, p)
            ios.open()

        except (AuthenticationException):
            print('Authentication failure: ' + device)
            continue
        except (NetMikoTimeoutException):
            print('Timeout to device: ' + device)
            continue
        except (EOFError):
            print('End of file while attempting device ' + device)
            continue
        except (SSHException):
            print('SSH Issue. Are you sure SSH is enabled? ' + device)
            continue
        except Exception as unknown_error:
            print('Unspecified error: ' + str(unknown_error))
            continue

        ios_output = ios.get_facts()
        os_version = ios_output.get("os_version", "")
        hostname = ios_output.get("hostname", "")
        fqdn = ios_output.get("fqdn", "")

        print("*" * 100)
        print(f"""Accessing
                    {hostname}
                    {device}
                    {fqdn}
                    {os_version}
                    """)

        ios.load_merge_candidate(filename='commands')
        diffs = ios.compare_config()

        if len(diffs) > 0:
            print(diffs)
            print("\n")
            print(f"you are conected to: ", {hostname}, {device})
            ios.commit_config()
            ios.close()

        else:
            print("No change is required")
            ios.discard_config()
            ios.close()


if __name__ == "__main__":
    main()