#!/usr/bin/python2
# vim: tabstop=4 shiftwidth=4 softtabstop=4

# Copyright 2014 IBM Corporation
# Copyright 2015-2018 Lenovo
#
# 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.


# ultimately, this should provide an interactive cli for navigating confluent
# tree and doing console with a socket.  <ESC>]0;<string><BELL> can be used to
# present info such as whether it is in a console or other mode and, if in
# console, how many other connections are live and looking
# this means 'wcons' simply needs to make a terminal run and we'll take care of
# the title while providing more info
# this also means the socket interface needs to have ways to convey more
# interesting pieces of data (like concurrent connection count)
# socket will probably switch to a TLV scheme:
# 32 bit TL, 8 bits of type code and 24 bit size
# type codes:
# 0: string data
# 1: json data
# 24 bit size allows the peer to avoid having to do any particular parsing to
# understand message boundaries (which is a significant burden on the xCAT
# protocol)

# When in a console client mode, will recognize two escape sequences by
# default:
# Ctrl-E, c, ?: mimic conserver behavior
# ctrl-]: go to interactive prompt (telnet escape, but not telnet prompt)
# esc-( would interfere with normal esc use too much
# ~ I will not use for now...

import math
import getpass
import optparse
import os
import select
import shlex
import signal
import socket
import struct
import sys
import time
try:
    import fcntl
    import termios
    import tty
except ImportError:
    pass
try:
    signal.signal(signal.SIGPIPE, signal.SIG_DFL)
except AttributeError:
    pass
exitcode = 0
consoleonly = False
consolename = ""
didconsole = False
target = "/"
path = os.path.dirname(os.path.realpath(__file__))
path = os.path.realpath(os.path.join(path, '..', 'lib', 'python'))
if path.startswith('/opt'):
    sys.path.append(path)

import confluent.termhandler as termhandler
import confluent.tlvdata as tlvdata
import confluent.client as client

conserversequence = '\x05c'  # ctrl-e, c
clearpowermessage = False

oldtcattr = None
fd = sys.stdin
try:
    if fd.isatty():
        oldtcattr = termios.tcgetattr(fd.fileno())
except NameError:
    pass
netserver = None
laststate = {}


class BailOut(Exception):
    def __init__(self, errorcode=0):
        self.errorcode = errorcode


def print_help():
    print("confetty provides a filesystem like interface to confluent.  "
          "Navigation is done using the same commands as would be used in a "
          "filesystem.  Tab completion is supported to aid in navigation,"
          "as is up arrow to recall previous commands and control-r to search"
          "previous command history, similar to using bash\n\n"
          "The supported commands are:\n"
          "cd [location] - Set the current command context, similar to a "
          "working directory.\n"
          "show [resource] - Present the information about the specified "
          "resource, or current context if omitted.\n"
          "create [resource] attributename=value attributename=value - Create "
          "a new instance of a resource.\n"
          "remove [resource] - Remove a resource from a list\n"
          "set [resource] attributename=value attributename=value - Change "
          "the specified attributes value for the given resource name\n"
          "unset [resource] attributename - Clear any value for the given "
          "attribute names on a resource.\n"
          "start [resource] - When used on a text session resource, it "
          "enters remote terminal mode.  In this mode, use 'ctrl-e, c, ?' for "
          "help"
          )
    #TODO(jjohnson2): lookup context help for 'target' variable, perhaps
    #common with the api document


def updatestatus(stateinfo={}):
    global powerstate, powertime, clearpowermessage
    status = consolename
    info = []
    for statekey in stateinfo:
        laststate[statekey] = stateinfo[statekey]
    if ('connectstate' in laststate and
            laststate['connectstate'] != 'connected'):
        info.append(laststate['connectstate'])
        if laststate['connectstate'] == 'closed':
            quitconfetty(fullexit=consoleonly)
    if 'error' in laststate:
        info.append(laststate['error'])
        # error will be repeated if relevant
        # avoid keeping it around as stale
        del laststate['error']
    if 'state' in stateinfo:  # currently only read power means anything
        newpowerstate = stateinfo['state']['value']
        if newpowerstate != powerstate and newpowerstate == 'off':
            sys.stdout.write("\x1b[2J\x1b[;H[powered off]\r\n")
            clearpowermessage = True
        if newpowerstate == 'on' and clearpowermessage:
            sys.stdout.write("\x1b[2J\x1b[;H")
            clearpowermessage = False
        powerstate = newpowerstate
    if 'clientcount' in laststate and laststate['clientcount'] != 1:
        info.append('clients: %d' % laststate['clientcount'])
    if 'bufferage' in stateinfo and stateinfo['bufferage'] is not None:
        laststate['showtime'] = time.time() - stateinfo['bufferage']
    if 'showtime' in laststate:
        showtime = laststate['showtime']
        age = time.time() - laststate['showtime']
        if age > 86400:  # older than one day
            # disambiguate by putting date in and time
            info.append(time.strftime('%m-%dT%H:%M', time.localtime(showtime)))
        else:
            info.append(time.strftime('%H:%M', time.localtime(showtime)))
    if info:
        status += ' [' + ','.join(info) + ']'
    if os.environ.get('TERM', '') not in ('linux'):
        sys.stdout.write('\x1b]0;console: %s\x07' % status)
    sys.stdout.flush()


def recurse_format(datum, levels=0):
    ret = ''
    import json
    return json.dumps(datum, ensure_ascii=False, indent=1)
    if isinstance(datum, dict):
        for key in datum.iterkeys():
            if datum[key] is None:
                continue
            ret += key + ':'
            if type(datum[key]) in (str, unicode):
                ret += datum[key] + '\n'
            else:
                ret += recurse_format(datum[key], levels + 1)
    elif isinstance(datum, list):
        if type(datum[0]) in (str, unicode):
            ret += '[' + ",".join(datum) + ']\n'
        else:
            ret += '['
            elems = []
            for elem in datum:
                elems.append('{' + recurse_format(elem, levels + 1) + '}')
            ret += ','.join(elems)
            ret += ('  ' * levels) + ']\n'
    return ret


def prompt():
    if os.environ.get('TERM', '') not in ('linux'):
        sys.stdout.write('\x1b]0;confetty: %s\x07' % target)
    try:
        return raw_input(target + ' -> ')
    except KeyboardInterrupt:
        print ""
        return ""
    except EOFError:  # ctrl-d
        print("exit")
        return "exit"
#    sys.stdout.write(target + ' -> ')
#    sys.stdout.flush()
#    username = raw_input("Name: ")

valid_commands = [
    'start',
    'cd',
    'show',
    'set',
    'unset',
    'create',
    'remove',
    'rm',
    'delete',
    'help',
]

candidates = None
session = None


def completer(text, state):
    try:
        return rcompleter(text, state)
    except:
        pass
        #import traceback
        #traceback.print_exc()


def rcompleter(text, state):
    global candidates
    global valid_commands
    cline = readline.get_line_buffer()
    cline = cline[:readline.get_endidx()]
    if len(text):
        cline = cline[:-len(text)]
    args = shlex.split(cline, posix=True)
    currpos = len(args)
    if currpos and cline[-1] == ' ':
        lastarg = ''
        currpos += 1
    elif currpos:
        lastarg = args[-1]
    else:
        lastarg = ''
    if currpos <= 1:
        foundcount = 0
        for cmd in valid_commands:
            if cmd.startswith(text):
                if foundcount == state:
                    return cmd
                else:
                    foundcount += 1
        candidates = None
        return None
    cmd = args[0]
    if candidates is None:
        candidates = []
        targpath = fullpath_target(lastarg)
        for res in session.read(targpath):
            if 'item' in res:  # a link relation
                if type(res['item']) == dict:
                    candidates.append(res['item']["href"])
                else:
                    for item in res['item']:
                        candidates.append(item["href"])
    foundcount = 0
    for elem in candidates:
        if cmd == 'cd' and elem[-1] != '/':
            continue
        if elem.startswith(text):
            if foundcount == state:
                return elem
            else:
                foundcount += 1
    candidates = None
    return None


def parse_command(command):
    try:
        args = shlex.split(command, posix=True)
    except ValueError as ve:
        print('Error: ' + str(ve))
        return []
    return args


currchildren = None


def print_result(res):
    if 'errorcode' in res or 'error' in res:
        print res['error']
        return
    if 'databynode' in res:
        print_result(res['databynode'])
        return
    for key in sorted(res):
        notes = []
        if res[key] is None:
            attrstr = '%s=""' % key
        elif type(res[key]) == list:
            attrstr = '%s=%s' % (key, recurse_format(res[key]))
        elif not isinstance(res[key], dict):
            try:
                print '{0}: {1}'.format(key, res[key])
            except UnicodeEncodeError:
                print '{0}: {1}'.format(key, repr(res[key]))
            continue
        elif 'value' in res[key] and res[key]['value'] is not None:
            attrstr = '%s="%s"' % (key, res[key]['value'])
        elif 'value' in res[key] and res[key]['value'] is None:
            attrstr = '%s=""' % key
        elif 'isset' in res[key] and res[key]['isset']:
            attrstr = '%s="********"' % key
        elif 'isset' in res[key] or not res[key]:
            attrstr = '%s=""' % key
        else:
            sys.stdout.write('{0}: '.format(key))
            if isinstance(res[key], str) or isinstance(res[key], unicode):
                print res[key]
            else:
                print_result(res[key])
            continue
        if res[key] is not None and 'inheritedfrom' in res[key]:
            notes.append(
                'Inherited from %s' % res[key]['inheritedfrom'])
        if res[key] is not None and 'expression' in res[key]:
            notes.append(
                ('Derived from expression "%s"' %
                 res[key]['expression']))
        if notes:
            notestr = '(' + ', '.join(notes) + ')'
            output = '{0:<40} {1:>39}'.format(attrstr, notestr)
        else:
            output = attrstr
        try:
            print(output)
        except (UnicodeDecodeError, UnicodeEncodeError):
            print(output.encode('utf-8'))


def do_command(command, server):
    global exitcode
    global target
    global currconsole
    global currchildren
    exitcode = 0
    argv = parse_command(command)
    if len(argv) == 0:
        return
    argv[0] = argv[0].lower()
    if argv[0] == 'exit':
        if os.environ.get('TERM', '') not in ('linux'):
            sys.stdout.write('\x1b]0;\x07')
        raise Bailout()
    elif argv[0] in ('help', '?'):
        return print_help()
    elif argv[0] == 'cd':
        otarget = target
        if len(argv) > 1:
            target = fullpath_target(argv[1], forcepath=True)
        else:  # cd by itself, go 'home'
            target = '/'
        if target[-1] == '/':
            parentpath = target[:-1]
        else:
            parentpath = target
        if parentpath:
            childname = '{0}/'.format(parentpath[parentpath.rindex('/') + 1:])
            parentpath = parentpath[:parentpath.rindex('/') + 1]
            if parentpath == '/noderange/':
                for res in session.read(target, server):
                    if 'errorcode' in res:
                        exitcode = res['errorcode']
                        target = otarget
                    if 'error' in res:
                        sys.stderr.write(target + ': ' + res['error'] + '\n')
                        target = otarget
            else:
                foundchild = False
                for res in session.read(parentpath, server):
                    try:
                        if res['item']['href'] == childname:
                            foundchild = True
                    except KeyError:
                        pass
                    if 'errorcode' in res:
                        exitcode = res['errorcode']
                        target = otarget
                    if 'error' in res:
                        sys.stderr.write(target + ': ' + res['error'] + '\n')
                        target = otarget
                if not foundchild:
                    sys.stderr.write(target + ': Target not found - \n')
                    target = otarget
    elif argv[0] in ('cat', 'show', 'ls', 'dir'):
        if len(argv) > 1:
            targpath = fullpath_target(argv[1])
            if argv[0] in ('ls', 'dir'):
                if targpath[-1] != '/':
                    # could still be a directory, fetch the parent..
                    childname = targpath[targpath.rindex('/') + 1:]
                    parentpath = targpath[:targpath.rindex('/') + 1]
                    if parentpath != '/noderange/':
                        # if it were /noderange/, then it's a directory
                        # even though parent won't tell us that
                        for res in session.read(parentpath, server):
                            try:
                                if res['item']['href'] == childname:
                                    print(childname)
                                    return
                            except KeyError:
                                pass
        else:
            targpath = target
        for res in session.read(targpath):
            if 'item' in res:  # a link relation
                if type(res['item']) == dict:
                    print res['item']["href"]
                else:
                    for item in res['item']:
                        print item["href"]
            else:  # generic attributes to list
                if 'error' in res:
                    sys.stderr.write(res['error'] + '\n')
                if 'errorcode' in res:
                    exitcode = res['errorcode']
                    continue
                print_result(res)
    elif argv[0] == 'start':
        targpath = fullpath_target(argv[1])
        nodename = targpath.split('/')[-3]
        currconsole = targpath
        startrequest = {'operation': 'start', 'path': targpath,
                        'parameters': {}}
        height, width = struct.unpack(
            'hh', fcntl.ioctl(sys.stdout, termios.TIOCGWINSZ, b'....'))[:2]
        startrequest['parameters']['width'] = width
        startrequest['parameters']['height'] = height
        for param in argv[2:]:
            (parmkey, parmval) = param.split("=")
            startrequest['parameters'][parmkey] = parmval
        tlvdata.send(
            session.connection, startrequest)
        status = tlvdata.recv(session.connection)
        if 'error' in status:
            if 'errorcode' in status:
                exitcode = status['errorcode']
            sys.stderr.write('Error: ' + status['error'] + '\n')
            while '_requestdone' not in status:
                status = tlvdata.recv(session.connection)
            return
        startconsole(nodename)
        return
    elif argv[0] == 'set':
        setvalues(argv[1:])
    elif argv[0] == 'create':
        createresource(argv[1:])
    elif argv[0] in ('rm', 'delete', 'remove'):
        delresource(argv[1])
    elif argv[0] in ('unset', 'clear'):
        clearvalues(argv[1], argv[2:])
    elif argv[0] == 'shutdown':
        shutdown()
    else:
        sys.stderr.write("%s: command not found...\n" % argv[0])


def shutdown():
    tlvdata.send(session.connection, {'operation': 'shutdown', 'path': '/'})


def createresource(args):
    resname = args[0]
    attribs = args[1:]
    keydata = parameterize_attribs(attribs)
    if keydata is None:
        return
    targpath = fullpath_target(resname)
    if targpath.startswith('/noderange//'):
        collection = targpath
    else:
        collection, _, resname = targpath.rpartition('/')
        if 'name' not in keydata:
            keydata['name'] = resname
    makecall(session.create, (collection, keydata))


def makecall(callout, args):
    global exitcode
    for response in callout(*args):
        if 'deleted' in response:
            print("Deleted: " + response['deleted'])
        if 'created' in response:
            print("Created: " + response['created'])
        if 'error' in response:
            if 'errorcode' in response:
                exitcode = response['errorcode']
            sys.stderr.write('Error: ' + response['error'] + '\n')
        if 'databynode' in response:
            lresponse = response['databynode']
            for node in lresponse:
                if 'errorcode' in lresponse[node]:
                    exitcode = lresponse[node]['errorcode']
                if 'error' in lresponse[node]:
                    sys.stderr.write('{0}: Error - {1}\n'.format(node, lresponse[node]['error']))


def clearvalues(resource, attribs):
    global exitcode
    targpath = fullpath_target(resource)
    keydata = {}
    for attrib in attribs:
        keydata[attrib] = None
    for res in session.update(targpath, keydata):
        if 'error' in res:
            if 'errorcode' in res:
                exitcode = res['errorcode']
            sys.stderr.write('Error: ' + res['error'] + '\n')


def delresource(resname):
    resname = fullpath_target(resname)
    makecall(session.delete, (resname,))


def setvalues(attribs):
    global exitcode
    if '=' in attribs[0]:  # going straight to attribute
        resource = attribs[0][:attribs[0].index("=")]
        if '/' in resource:
            lastslash = resource.rindex('/')
            attribs[0] = attribs[0][lastslash + 1:]
    else:  # an actual resource
        resource = attribs[0]
        attribs = attribs[1:]
    keydata = parameterize_attribs(attribs)
    if not keydata:
        return
    targpath = fullpath_target(resource)
    for res in session.update(targpath, keydata):
        if 'error' in res:
            if 'errorcode' in res:
                exitcode = res['errorcode']
            sys.stderr.write('Error: ' + res['error'] + '\n')
        print_result(res)


def parameterize_attribs(attribs):
    keydata = {}
    for attrib in attribs:
        if '=' not in attrib:
            sys.stderr.write("Invalid syntax %s\n" % attrib)
            return None
        key = attrib[:attrib.index("=")]
        value = attrib[attrib.index("=") + 1:]
        if key == 'groups':
            value = value.split(',')
        keydata[key] = value
    return keydata


def fullpath_target(currpath, forcepath=False):
    global target
    if currpath == '':
        return target
    pathcomponents = currpath.split("/")
    if pathcomponents[-1] == "":  # preserve path
        forcepath = True
    if pathcomponents[0] == "":  # absolute path
        ntarget = currpath
    else:
        targparts = target.split("/")[:-1]
        for component in pathcomponents:
            if component in ('.', ''):  # ignore these
                continue
            elif component == '..':
                if len(targparts) > 0:
                    del targparts[-1]
            else:
                targparts.append(component)
        if forcepath and (len(targparts) == 0 or targparts[-1] != ""):
            targparts.append('')
        ntarget = '/'.join(targparts)
    if forcepath and (len(ntarget) == 0 or ntarget[-1] != '/'):
        ntarget += '/'
    return ntarget

def do_resize(a, b):
    if not inconsole:
        return
    height, width = struct.unpack(
        'hh', fcntl.ioctl(sys.stdout, termios.TIOCGWINSZ, b'....'))[:2]
    tlvdata.send(session.connection, {'operation': 'resize', 'width': width,
                                      'height': height})


def startconsole(nodename):
    global inconsole
    global consolename
    global didconsole
    signal.signal(signal.SIGWINCH, do_resize)
    didconsole = True
    consolename = nodename
    tty.setraw(sys.stdin.fileno())
    currfl = fcntl.fcntl(sys.stdin.fileno(), fcntl.F_GETFL)
    fcntl.fcntl(sys.stdin.fileno(), fcntl.F_SETFL, currfl | os.O_NONBLOCK)
    inconsole = True


def quitconfetty(code=0, fullexit=False, fixterm=True):
    global inconsole
    global currconsole
    global didconsole
    if fixterm or didconsole:
        currfl = fcntl.fcntl(sys.stdin.fileno(), fcntl.F_GETFL)
        fcntl.fcntl(sys.stdin.fileno(), fcntl.F_SETFL, currfl ^ os.O_NONBLOCK)
        if oldtcattr is not None:
            termios.tcsetattr(sys.stdin.fileno(), termios.TCSANOW, oldtcattr)
    # Request default color scheme, to undo potential weirdness of terminal
    if sys.stdout.isatty():
        sys.stdout.write('\x1b[m')
    if fullexit:
        if sys.stdout.isatty() and os.environ.get('TERM', '') not in ('linux'):
            sys.stdout.write('\x1b]0;\x07')
        raise BailOut(code)
    else:
        tlvdata.send(session.connection, {'operation': 'stop',
                                          'path': currconsole})
        inconsole = False


def get_session_node(shellargs):
    # straight to node console
    if len(shellargs) == 1 and ' ' not in shellargs[0]:
        return shellargs[0]
    if len(shellargs) == 2 and shellargs[0] == 'start':
        args = [s for s in shellargs[1].split('/') if s]
        if len(args) == 4 and args[0] == 'nodes' and args[2] == 'console' and \
                args[3] == 'session':
            return args[1]
    return None


def conserver_command(filehandle, localcommand):
    # x - conserver has that as 'show baud', I am inclined to replace that with
    #     'request exclusive'
    # b - conserver has that as 'broadcast message', I'm tempted to use that
    #     for break
    # r - replay
    # p - replay (this is the one I've always used)
    # f - force attach read/write
    # a - attach read/write
    # s - spy mode
    # l[n] - send a particular break, tempted to do l0 for compatibility
    # o - reopen tty, this should mean reconnect console
    # d - down a console... never used this...
    # L - toggle logging
    # w - who is on console

    cmdlen = 1
    localcommand = get_command_bytes(filehandle, localcommand, cmdlen)

    if localcommand[0] == '.':
        print("disconnect]\r")
        quitconfetty(fullexit=consoleonly)
    elif localcommand[0] == 'o':
        tlvdata.send(session.connection, {'operation': 'reopen',
                                          'path': currconsole})
        print('reopen]\r')
    elif localcommand[0] == 'b':
        tlvdata.send(session.connection, {'operation': 'break',
                                          'path': currconsole})
        print("break sent]\r")
    elif localcommand[0] == 'p':  # power
        cmdlen += 1
        localcommand = get_command_bytes(filehandle, localcommand, cmdlen)

        if localcommand[1] == 'o': # off
            print("powering off...")
            session.simple_noderange_command(consolename, '/power/state', 'off')
            print("complete]\r")
        elif localcommand[1] == 's':  # shutdown
            print("shutting down...")
            session.simple_noderange_command(consolename, '/power/state', 'shutdown')
            print("complete]\r")
        elif localcommand[1] == 'b': # boot
            cmdlen += 1
            localcommand = get_command_bytes(filehandle, localcommand, cmdlen)

            if localcommand[2] == 's':  # boot to setup
                print("booting to setup...")

                bootmode = 'uefi'
                bootdev = 'setup'

                rc = session.simple_noderange_command(consolename, '/boot/nextdevice', bootdev, bootmode=bootmode)

                if rc:
                    print("Error]\r")
                else:
                    rc = session.simple_noderange_command(consolename, '/power/state', 'boot')
                    if rc:
                        print("Error]\r")
                    else:
                        print("complete]\r")

            elif localcommand[2] == 'n':  # boot to network
                print("booting to network...")

                bootmode = 'uefi'
                bootdev = 'network'

                rc = session.simple_noderange_command(consolename, '/boot/nextdevice', bootdev, bootmode=bootmode)

                if rc:
                    print("Error]\r")
                else:
                    rc = session.simple_noderange_command(consolename, '/power/state', 'boot')

                    if rc:
                        print("Error]\r")
                    else:
                        print("complete]\r")

            elif localcommand[2] == '\x0d':  # boot to default
                print("booting to default...")

                bootmode = 'uefi'
                bootdev = 'default'

                rc = session.simple_noderange_command(consolename, '/boot/nextdevice', bootdev, bootmode=bootmode)

                if rc:
                    print("Error]\r")
                else:
                    rc = session.simple_noderange_command(consolename, '/power/state', 'boot')

                    if rc:
                        print("Error]\r")
                    else:
                        print("complete]\r")

            else:
                print("Unknown boot state.]\r")

        else:
            print("Unknown power state.]\r")

        check_power_state()
    elif localcommand[0] == 'r':
        sys.stdout.write('\x1b7\x1b[999;999H\x1b[6n')
        sys.stdout.flush()
        reply = ''
        while 'R' not in reply:
            try:
                reply += sys.stdin.read(1)
            except IOError:
                pass
        reply = reply.replace('\x1b[', '')
        reply = reply.replace('R', '')
        height, width = reply.split(';')
        sys.stdout.write('\x1b8')
        sys.stdout.flush()
        print('sending stty commands]')
        return 'stty columns {0}\rstty rows {1}\r'.format(width, height)
    elif localcommand[0] == '?':
        print("help]\r")
        print(".       exit console\r")
        print("b       break\r")
        print("o       reopen\r")
        print("po      power off\r")
        print("ps      shutdown\r")
        print("pbs     boot to setup\r")
        print("pbn     boot to network\r")
        print("pb<ent> boot to default\r")
        print("r       send stty command to resize terminal\r")
        print("<cr> abort command\r")
    elif localcommand[0] == '\x0d':
        print("ignored]\r")
    else:  # not a command at all..
        print("unknown -- use '?']\r")


def get_command_bytes(filehandle, localcommand, cmdlen):
    while len(localcommand) < cmdlen:
        try:
            ready, _, _ = select.select((filehandle,), (), (), 1)
        except select.error:
            ready = ()
        if ready:
            localcommand += filehandle.read()
    return localcommand


def check_escape_seq(currinput, filehandle):
    while conserversequence.startswith(currinput):
        if currinput.startswith(conserversequence):  # We have full sequence
            sys.stdout.write("[")
            sys.stdout.flush()
            return conserver_command(
                filehandle, currinput[len(conserversequence):])
        try:
            ready, _, _ = select.select((filehandle,), (), (), 3)
        except select.error:
            ready = ()
        if not ready:  # 3 seconds of no typing
            break
        currinput += filehandle.read()
    return currinput

parser = optparse.OptionParser()
parser.add_option("-s", "--server", dest="netserver",
                  help="Confluent instance to connect to",
                  metavar="SERVER:PORT")
parser.add_option("-c", "--control", dest="controlpath",
                  help="Path to offer terminal control",
                  metavar="PATH")
parser.add_option(
    '-m', '--mintime', default=0,
    help='Minimum time to run or else pause for input (used to keep a '
         'terminal from closing quickly on error)')
opts, shellargs = parser.parse_args()

username = None
passphrase = None
def server_connect():
    global session, username, passphrase
    if opts.controlpath:
        termhandler.TermHandler(opts.controlpath)
    if opts.netserver:  # going over a TLS network
        session = client.Command(opts.netserver)
    elif 'CONFLUENT_HOST' in os.environ:
        session = client.Command(os.environ['CONFLUENT_HOST'])
    else:  # unix domain
        session = client.Command()

    # Next stop, reading and writing from whichever of stdin and server goes first.
    #see pyghmi code for solconnect.py
    if not session.authenticated and username is not None:
        session.authenticate(username, passphrase)
    if not session.authenticated and 'CONFLUENT_USER' in os.environ:
        username = os.environ['CONFLUENT_USER']
        passphrase = os.environ['CONFLUENT_PASSPHRASE']
        session.authenticate(username, passphrase)
    while not session.authenticated:
        username = raw_input("Name: ")
        passphrase = getpass.getpass("Passphrase: ")
        session.authenticate(username, passphrase)

def check_power_state():
    tlvdata.send(
        session.connection,
        {'operation': 'retrieve',
         'path': '/nodes/' + consolename + '/power/state'})
    return


if sys.stdout.isatty():
    import readline


def main():
    global inconsole
    try:
        server_connect()
    except EOFError, KeyboardInterrupt:
        raise BailOut(0)
    except socket.gaierror:
        sys.stderr.write('Could not connect to confluent\n')
        raise BailOut(1)
    # clear on start can help with readable of TUI, but it
    # can be annoying, so for now don't do it.
    # sys.stdout.write('\x1b[H\x1b[J')
    # sys.stdout.flush()
    global powerstate, powertime, clearpowermessage


    if sys.stdout.isatty():

        readline.parse_and_bind("tab: complete")
        readline.parse_and_bind("set bell-style none")
        dl = readline.get_completer_delims().replace('-', '')
        readline.set_completer_delims(dl)
        readline.set_completer(completer)

    doexit = False
    inconsole = False
    pendingcommand = ""
    session_node = get_session_node(shellargs)
    if session_node is not None:
        consoleonly = True
        do_command("start /nodes/%s/console/session" % session_node, netserver)
        doexit = True
    elif shellargs:
        command = " ".join(shellargs)
        do_command(command, netserver)
        quitconfetty(fullexit=True, fixterm=False)

    powerstate = None
    powertime = None

    while inconsole or not doexit:
        if inconsole:
            try:
                rdylist, _, _ = select.select(
                    (sys.stdin, session.connection), (), (), 10)
            except select.error:
                rdylist = ()
            for fh in rdylist:
                if fh == session.connection:
                    # this only should get called in the
                    # case of a console session
                    # each command should slurp up all relevant
                    # recv potential
                    #fh.read()
                    try:
                        data = tlvdata.recv(fh)
                    except Exception:
                        data = None
                    if type(data) == dict:
                        updatestatus(data)
                        continue
                    if data is not None:
                        if clearpowermessage:
                            sys.stdout.write("\x1b[2J\x1b[;H")
                            clearpowermessage = False
                        try:
                            sys.stdout.write(data)
                        except IOError:  # Some times circumstances are bad
                            # resort to byte at a time...
                            for d in data:
                                sys.stdout.write(d)
                        now = time.time()
                        if ('showtime' not in laststate or
                                (now // 60) != laststate['showtime'] // 60):
                            # don't bother churning if minute does not change
                            laststate['showtime'] = now
                            updatestatus()
                        sys.stdout.flush()
                    else:
                        deadline = 5
                        connected = False
                        while not connected and deadline > 0:
                            try:
                                server_connect()
                                connected = True
                            except (socket.gaierror, socket.error):
                                pass
                            if not connected:
                                time.sleep(1)
                                deadline -=1
                        if connected:
                            do_command(
                                "start /nodes/%s/console/session skipreplay=True" % consolename,
                                netserver)
                        else:
                            doexit = True
                            inconsole = False
                            sys.stdout.write("\r\n[remote disconnected]\r\n")
                        break
                else:
                    try:
                        myinput = fh.read()
                        myinput = check_escape_seq(myinput, fh)
                        if myinput:
                            tlvdata.send(session.connection, myinput)
                    except IOError:
                        pass
            if powerstate is None or powertime < time.time() - 10:  # Check powerstate every 10 seconds
                powertime = time.time()
                powerstate = True
                check_power_state()
        else:
            currcommand = prompt()
            try:
                do_command(currcommand, netserver)
            except socket.error:
                try:
                    server_connect()
                    do_command(currcommand, netserver)
                except socket.error:
                    doexit = True
                    sys.stdout.write('Lost connection to server')
    quitconfetty(fullexit=True)

if __name__ == '__main__':
    errcode = 0
    deadline = 0
    if opts.mintime:
        deadline = os.times()[4] + float(opts.mintime)
    try:
        main()
    except BailOut as e:
        errcode = e.errorcode
    finally:
        if deadline and os.times()[4] < deadline:
            sys.stderr.write('[Exited early, hit enter to continue]')
            sys.stdin.readline()
        if errcode == 0:
            errcode = exitcode
        sys.exit(errcode)