#!/usr/bin/env python

import argparse
import json
import socket

SPDK_JSONRPC_PORT_BASE = 5260

def print_dict(d):
    print json.dumps(d, indent=2)

parser = argparse.ArgumentParser(description='SPDK RPC command line interface')
parser.add_argument('-s', dest='server_ip', help='RPC server IP address', default='127.0.0.1')
parser.add_argument('-p', dest='instance_id', help='RPC server instance ID', default=0, type=int)
subparsers = parser.add_subparsers(help='RPC methods')


def int_arg(arg):
    return int(arg, 0)


def jsonrpc_call(method, params={}):
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    s.connect((args.server_ip, SPDK_JSONRPC_PORT_BASE + args.instance_id))
    req = {}
    req['jsonrpc'] = '2.0'
    req['method'] = method
    req['id'] = 1
    if (params):
        req['params'] = params
    reqstr = json.dumps(req)
    s.sendall(reqstr)
    buf = ''
    closed = False
    response = {}
    while not closed:
        newdata = s.recv(4096)
        if (newdata == b''):
            closed = True
        buf += newdata
        try:
            response = json.loads(buf)
        except ValueError:
            continue  # incomplete response; keep buffering
        break
    s.close()

    if not response:
        if method == "kill_instance":
            exit(0)
        print "Connection closed with partial response:"
        print buf
        exit(1)

    if 'error' in response:
        print "Got JSON-RPC error response"
        print "request:"
        print_dict(json.loads(reqstr))
        print "response:"
        print_dict(response['error'])
        exit(1)

    return response['result']

def get_luns(args):
    print_dict(jsonrpc_call('get_luns'))

p = subparsers.add_parser('get_luns', help='Display active LUNs')
p.set_defaults(func=get_luns)


def get_portal_groups(args):
    print_dict(jsonrpc_call('get_portal_groups'))

p = subparsers.add_parser('get_portal_groups', help='Display current portal group configuration')
p.set_defaults(func=get_portal_groups)


def get_initiator_groups(args):
    print_dict(jsonrpc_call('get_initiator_groups'))

p = subparsers.add_parser('get_initiator_groups', help='Display current initiator group configuration')
p.set_defaults(func=get_initiator_groups)


def get_target_nodes(args):
    print_dict(jsonrpc_call('get_target_nodes'))

p = subparsers.add_parser('get_target_nodes', help='Display target nodes')
p.set_defaults(func=get_target_nodes)


def construct_target_node(args):
    lun_name_id_dict = dict(u.split(":")
                            for u in args.lun_name_id_pairs.split(" "))
    lun_names = lun_name_id_dict.keys()
    lun_ids = list(map(int, lun_name_id_dict.values()))

    pg_tags = []
    ig_tags = []
    for u in args.pg_ig_mappings.split(" "):
        pg, ig = u.split(":")
        pg_tags.append(int(pg))
        ig_tags.append(int(ig))

    params = {
        'name': args.name,
        'alias_name': args.alias_name,
        'pg_tags': pg_tags,
        'ig_tags': ig_tags,
        'lun_names': lun_names,
        'lun_ids': lun_ids,
        'queue_depth': args.queue_depth,
        'chap_disabled': args.chap_disabled,
        'chap_required': args.chap_required,
        'chap_mutual': args.chap_mutual,
        'chap_auth_group': args.chap_auth_group,
    }
    jsonrpc_call('construct_target_node', params)

p = subparsers.add_parser('construct_target_node', help='Add a target node')
p.add_argument('name', help='Target node name (ASCII)')
p.add_argument('alias_name', help='Target node alias name (ASCII)')
p.add_argument('lun_name_id_pairs', help="""Whitespace-separated list of LUN <name:id> pairs enclosed
in quotes.  Format:  'lun_name0:id0 lun_name1:id1' etc
Example: 'Malloc0:0 Malloc1:1 Malloc5:2'
*** The LUNs must pre-exist ***
*** LUN0 (id = 0) is required ***
*** LUN names cannot contain space or colon characters ***""")
p.add_argument('pg_ig_mappings', help="""List of (Portal_Group_Tag:Initiator_Group_Tag) mappings
Whitespace separated, quoted, mapping defined with colon
separated list of "tags" (int > 0)
Example: '1:1 2:2 2:1'
*** The Portal/Initiator Groups must be precreated ***""")
p.add_argument('queue_depth', help='Desired target queue depth', type=int)
p.add_argument('chap_disabled', help="""CHAP authentication should be disabled for this target node.
*** Mutually exclusive with chap_required ***""", type=int)
p.add_argument('chap_required', help="""CHAP authentication should be required for this target node.
*** Mutually exclusive with chap_disabled ***""", type=int)
p.add_argument('chap_mutual', help='CHAP authentication should be mutual/bidirectional.', type=int)
p.add_argument('chap_auth_group', help="""Authentication group ID for this target node.
*** Authentication group must be precreated ***""", type=int)
p.set_defaults(func=construct_target_node)


def construct_malloc_lun(args):
    num_blocks = (args.total_size * 1024 * 1024) / args.block_size
    params = {'num_blocks': num_blocks, 'block_size': args.block_size}
    jsonrpc_call('construct_malloc_lun', params)

p = subparsers.add_parser('construct_malloc_lun', help='Add a LUN with malloc backend')
p.add_argument('total_size', help='Size of malloc LUN in MB (int > 0)', type=int)
p.add_argument('block_size', help='Block size for this LUN', type=int)
p.set_defaults(func=construct_malloc_lun)


def construct_aio_lun(args):
    params = {'fname': args.fname}
    jsonrpc_call('construct_aio_lun', params)

p = subparsers.add_parser('construct_aio_lun', help='Add a LUN with aio backend')
p.add_argument('fname', help='Path to device or file (ex: /dev/sda)')
p.set_defaults(func=construct_aio_lun)


def set_trace_flag(args):
    params = {'flag': args.flag}
    jsonrpc_call('set_trace_flag', params)

p = subparsers.add_parser('set_trace_flag', help='set trace flag')
p.add_argument('flag', help='trace mask we want to set. (for example "debug").')
p.set_defaults(func=set_trace_flag)


def clear_trace_flag(args):
    params = {'flag': args.flag}
    jsonrpc_call('clear_trace_flag', params)

p = subparsers.add_parser('clear_trace_flag', help='clear trace flag')
p.add_argument('flag', help='trace mask we want to clear. (for example "debug").')
p.set_defaults(func=clear_trace_flag)


def get_trace_flags(args):
    print_dict(jsonrpc_call('get_trace_flags'))

p = subparsers.add_parser('get_trace_flags', help='get trace flags')
p.set_defaults(func=get_trace_flags)


def add_portal_group(args):
    # parse out portal list host1:port1 host2:port2
    portals = []
    for p in args.portal_list:
        host_port = p.split(':')
        portals.append({'host': host_port[0], 'port': host_port[1]})

    params = {'tag': args.tag, 'portals': portals}
    jsonrpc_call('add_portal_group', params)

p = subparsers.add_parser('add_portal_group', help='Add a portal group')
p.add_argument('tag', help='Portal group tag (unique, integer > 0)', type=int)
p.add_argument('portal_list', nargs=argparse.REMAINDER, help="""List of portals in 'host:port' format, separated by whitespace
Example: '192.168.100.100:3260' '192.168.100.100:3261'""")
p.set_defaults(func=add_portal_group)


def add_initiator_group(args):
    initiators = []
    netmasks = []
    for i in args.initiator_list.split(' '):
        initiators.append(i)
    for n in args.netmask_list.split(' '):
        netmasks.append(n)

    params = {'tag': args.tag, 'initiators': initiators, 'netmasks': netmasks}
    jsonrpc_call('add_initiator_group', params)


p = subparsers.add_parser('add_initiator_group', help='Add an initiator group')
p.add_argument('tag', help='Initiator group tag (unique, integer > 0)', type=int)
p.add_argument('initiator_list', help="""Whitespace-separated list of initiator hostnames or IP addresses,
enclosed in quotes.  Example: 'ALL' or '127.0.0.1 192.168.200.100'""")
p.add_argument('netmask_list', help="""Whitespace-separated list of initiator netmasks enclosed in quotes.
Example: '255.255.0.0 255.248.0.0' etc""")
p.set_defaults(func=add_initiator_group)


def delete_target_node(args):
    params = {'name': args.target_node_name}
    jsonrpc_call('delete_target_node', params)

p = subparsers.add_parser('delete_target_node', help='Delete a target node')
p.add_argument('target_node_name', help='Target node name to be deleted. Example: iqn.2016-06.io.spdk:disk1.')
p.set_defaults(func=delete_target_node)


def delete_portal_group(args):
    params = {'tag': args.tag}
    jsonrpc_call('delete_portal_group', params)

p = subparsers.add_parser('delete_portal_group', help='Delete a portal group')
p.add_argument('tag', help='Portal group tag (unique, integer > 0)', type=int)
p.set_defaults(func=delete_portal_group)


def delete_initiator_group(args):
    params = {'tag': args.tag}
    jsonrpc_call('delete_initiator_group', params)

p = subparsers.add_parser('delete_initiator_group', help='Delete an initiator group')
p.add_argument('tag', help='Initiator group tag (unique, integer > 0)', type=int)
p.set_defaults(func=delete_initiator_group)


def delete_lun(args):
    params = {'name': args.lun_name}
    jsonrpc_call('delete_lun', params)

p = subparsers.add_parser('delete_lun', help='Delete a LUN')
p.add_argument('lun_name', help='LUN name to be deleted. Example: Malloc0.')
p.set_defaults(func=delete_lun)


def get_iscsi_connections(args):
    print_dict(jsonrpc_call('get_iscsi_connections'))

p = subparsers.add_parser('get_iscsi_connections', help='Display iSCSI connections')
p.set_defaults(func=get_iscsi_connections)


def get_scsi_devices(args):
    print_dict(jsonrpc_call('get_scsi_devices'))

p = subparsers.add_parser('get_scsi_devices', help='Display SCSI devices')
p.set_defaults(func=get_scsi_devices)


def add_ip_address(args):
    params = {'ifc_index': args.ifc_index, 'ip_address': args.ip_addr}
    jsonrpc_call('add_ip_address', params)

p = subparsers.add_parser('add_ip_address', help='Add IP address')
p.add_argument('ifc_index', help='ifc index of the nic device.', type=int)
p.add_argument('ip_addr', help='ip address will be added.')
p.set_defaults(func=add_ip_address)


def delete_ip_address(args):
    params = {'ifc_index': args.ifc_index, 'ip_address': args.ip_addr}
    jsonrpc_call('delete_ip_address', params)

p = subparsers.add_parser('delete_ip_address', help='Delete IP address')
p.add_argument('ifc_index', help='ifc index of the nic device.', type=int)
p.add_argument('ip_addr', help='ip address will be deleted.')
p.set_defaults(func=delete_ip_address)


def get_interfaces(args):
    print_dict(jsonrpc_call('get_interfaces'))

p = subparsers.add_parser('get_interfaces', help='Display current interface list')
p.set_defaults(func=get_interfaces)


def kill_instance(args):
    params = {'sig_name': args.sig_name}
    jsonrpc_call('kill_instance', params)

p = subparsers.add_parser('kill_instance', help='Send signal to instance')
p.add_argument('sig_name', help='signal will be sent to server.')
p.set_defaults(func=kill_instance)


args = parser.parse_args()
args.func(args)