mmgen-wallet/mmgen/daemon.py

#!/usr/bin/env python3
#
# mmgen = Multi-Mode GENerator, command-line Bitcoin cold storage solution
# Copyright (C)2013-2022 The MMGen Project <mmgen@tuta.io>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""
daemon.py:  Daemon control interface for the MMGen suite
"""

import os,time,importlib
from subprocess import run,PIPE,CompletedProcess
from collections import namedtuple

from .globalvars import g
from .color import set_vt100
from .util import msg,Msg_r,die
from .flags import *

_dd = namedtuple('daemon_data',['coind_name','coind_version','coind_version_str']) # latest tested version
_nw = namedtuple('coin_networks',['mainnet','testnet','regtest'])

class Daemon(Lockable):

	desc = 'daemon'
	debug = False
	wait = True
	use_pidfile = True
	pids = ()
	use_threads = False
	cfg_file = None
	new_console_mswin = False
	lockfile = None
	private_port = None
	avail_opts = ()
	avail_flags = () # like opts, but can be set or unset after instantiation
	_reset_ok = ('debug','wait','pids')

	def __init__(self,opts=None,flags=None):

		self.platform = g.platform
		if self.platform == 'win':
			self.use_pidfile = False
			self.use_threads = True

		self.opt = ClassOpts(self,opts)
		self.flag = ClassFlags(self,flags)

	def exec_cmd_thread(self,cmd):
		import threading
		tname = ('exec_cmd','exec_cmd_win_console')[self.platform == 'win' and self.new_console_mswin]
		t = threading.Thread(target=getattr(self,tname),args=(cmd,))
		t.daemon = True
		t.start()
		if self.platform == 'win':
			Msg_r(' \b') # blocks w/o this...crazy
		return True

	def exec_cmd_win_console(self,cmd):
		from subprocess import Popen,CREATE_NEW_CONSOLE,STARTUPINFO,STARTF_USESHOWWINDOW,SW_HIDE
		si = STARTUPINFO(dwFlags=STARTF_USESHOWWINDOW,wShowWindow=SW_HIDE)
		p = Popen(cmd,creationflags=CREATE_NEW_CONSOLE,startupinfo=si)
		p.wait()

	def exec_cmd(self,cmd,is_daemon=False):
		out = (PIPE,None)[is_daemon and self.opt.no_daemonize]
		try:
			cp = run(cmd,check=False,stdout=out,stderr=out)
		except Exception as e:
			die( 'MMGenCalledProcessError', f'Error starting executable: {type(e).__name__} [Errno {e.errno}]' )
		set_vt100()
		if self.debug:
			print(cp)
		return cp

	def run_cmd(self,cmd,silent=False,is_daemon=False):

		if self.debug:
			msg('\n\n')

		if self.debug or (is_daemon and not silent):
			msg(f'Starting {self.desc} on port {self.bind_port}')

		if self.use_threads and is_daemon and not self.opt.no_daemonize:
			ret = self.exec_cmd_thread(cmd)
		else:
			ret = self.exec_cmd(cmd,is_daemon)

		if isinstance(ret,CompletedProcess):
			if ret.stdout and (self.debug or not silent):
				msg(ret.stdout.decode().rstrip())
			if ret.stderr and (self.debug or (ret.returncode and not silent)):
				msg(ret.stderr.decode().rstrip())

		return ret

	@property
	def pid(self):
		if self.use_pidfile:
			with open(self.pidfile) as fp:
				return fp.read().strip()
		elif self.platform == 'win':
			"""
			Assumes only one running instance of given daemon.  If multiple daemons are running,
			the first PID in the list is returned and self.pids is set to the PID list.
			"""
			ss = f'{self.exec_fn}.exe'
			cp = self.run_cmd(['ps','-Wl'],silent=True)
			self.pids = ()
			# use Windows, not Cygwin, PID
			pids = tuple(line.split()[3] for line in cp.stdout.decode().splitlines() if ss in line)
			if pids:
				if len(pids) > 1:
					self.pids = pids
				return pids[0]
		elif self.platform == 'linux':
			ss = ' '.join(self.start_cmd)
			cp = self.run_cmd(['pgrep','-f',ss],silent=True)
			if cp.stdout:
				return cp.stdout.strip().decode()
		die(2,f'{ss!r} not found in process list, cannot determine PID')

	@property
	def bind_port(self):
		return self.private_port or self.rpc_port

	@property
	def state(self):
		if self.debug:
			msg(f'Testing port {self.bind_port}')
		return 'ready' if self.test_socket('localhost',self.bind_port) else 'stopped'

	@property
	def start_cmds(self):
		return [self.start_cmd]

	@property
	def stop_cmd(self):
		return ['kill','-Wf',self.pid] if self.platform == 'win' else ['kill',self.pid]

	def cmd(self,action,*args,**kwargs):
		return getattr(self,action)(*args,**kwargs)

	def do_start(self,silent=False):
		if not silent:
			msg(f'Starting {self.desc} on port {self.bind_port}')
		return self.run_cmd(self.start_cmd,silent=True,is_daemon=True)

	def do_stop(self,silent=False):
		if not silent:
			msg(f'Stopping {self.desc} on port {self.bind_port}')
		return self.run_cmd(self.stop_cmd,silent=True)

	def cli(self,*cmds,silent=False):
		return self.run_cmd(self.cli_cmd(*cmds),silent=silent)

	def state_msg(self,extra_text=None):
		extra_text = f'{extra_text} ' if extra_text else ''
		return '{:{w}} {:10} {}'.format(
			f'{self.desc} {extra_text}running',
			'pid N/A' if self.pid is None or self.pids else f'pid {self.pid}',
			f'port {self.bind_port}',
			w = 52 + len(extra_text) )

	def pre_start(self): pass

	def start(self,quiet=False,silent=False):
		if self.state == 'ready':
			if not (quiet or silent):
				msg(self.state_msg(extra_text='already'))
			return True

		self.wait_for_state('stopped')

		self.pre_start()

		ret = self.do_start(silent=silent)

		if self.wait:
			self.wait_for_state('ready')

		return ret

	def stop(self,quiet=False,silent=False):
		if self.state == 'ready':
			ret = self.do_stop(silent=silent)
			if self.pids:
				msg('Warning: multiple PIDs [{}] -- we may be stopping the wrong instance'.format(
					fmt_list(self.pids,fmt='bare')
				))
			if self.wait:
				self.wait_for_state('stopped')
			return ret
		else:
			if not (quiet or silent):
				msg(f'{self.desc} on port {self.bind_port} not running')
			return True

	def restart(self,silent=False):
		self.stop(silent=silent)
		return self.start(silent=silent)

	def test_socket(self,host,port,timeout=10):
		import socket
		try:
			socket.create_connection((host,port),timeout=timeout).close()
		except:
			return False
		else:
			return True

	def wait_for_state(self,req_state):
		for i in range(300):
			if self.state == req_state:
				return True
			time.sleep(0.2)
		else:
			die(2,f'Wait for state {req_state!r} timeout exceeded for {self.desc} (port {self.bind_port})')

class RPCDaemon(Daemon):

	avail_opts = ('no_daemonize',)

	def __init__(self):
		super().__init__()
		self.desc = '{} {} {}RPC daemon'.format(
			self.rpc_type,
			getattr(self.proto.network_names,self.proto.network),
			'test suite ' if self.test_suite else '' )
		self._set_ok += ('usr_daemon_args',)
		self.usr_daemon_args = []

	@property
	def start_cmd(self):
		return ([self.exec_fn] + self.daemon_args + self.usr_daemon_args)

class CoinDaemon(Daemon):
	networks = ('mainnet','testnet','regtest')
	cfg_file_hdr = ''
	avail_flags = ('keep_cfg_file',)
	avail_opts = ('no_daemonize','online')
	testnet_dir = None
	test_suite_port_shift = 1237
	rpc_user = None
	rpc_password = None

	_cd = namedtuple('coins_data',['coin_name','networks','daemon_ids'])
	coins = {
		'BTC': _cd('Bitcoin',           networks,              ['bitcoin_core']),
		'BCH': _cd('Bitcoin Cash Node', networks,              ['bitcoin_cash_node']),
		'LTC': _cd('Litecoin',          networks,              ['litecoin_core']),
		'XMR': _cd('Monero',            ('mainnet','testnet'), ['monero']),
		'ETH': _cd('Ethereum',          networks,              ['openethereum','geth']
			+ (['erigon'] if g.enable_erigon else []) ),
		'ETC': _cd('Ethereum Classic',  networks,              ['parity']),
	}

	@classmethod
	def get_network_ids(cls): # FIXME: gets IDs for _default_ daemon only
		from .protocol import CoinProtocol
		def gen():
			for coin,data in cls.coins.items():
				for network in data.networks:
					yield CoinProtocol.Base.create_network_id(coin,network)
		return list(gen())

	def __new__(cls,
			network_id = None,
			proto      = None,
			opts       = None,
			flags      = None,
			test_suite = False,
			port_shift = None,
			p2p_port   = None,
			datadir    = None,
			daemon_id  = None ):

		assert network_id or proto,        'CoinDaemon_chk1'
		assert not (network_id and proto), 'CoinDaemon_chk2'

		if proto:
			network_id = proto.network_id
			network    = proto.network
			coin       = proto.coin
		else:
			network_id = network_id.lower()
			from .protocol import CoinProtocol,init_proto
			proto = init_proto(network_id=network_id)
			coin,network = CoinProtocol.Base.parse_network_id(network_id)
			coin = coin.upper()

		daemon_ids = cls.coins[coin].daemon_ids
		daemon_id = daemon_id or g.daemon_id or daemon_ids[0]

		if daemon_id not in daemon_ids:
			die(1,f'{daemon_id!r}: invalid daemon_id - valid choices: {fmt_list(daemon_ids)}')

		me = Daemon.__new__(
			getattr(
				importlib.import_module(f'mmgen.base_proto.{proto.base_proto.lower()}.daemon'),
				daemon_id + '_daemon' ))

		assert network in me.networks, f'{network!r}: unsupported network for daemon {daemon_id}'
		me.network_id = network_id
		me.network = network
		me.coin = coin
		me.coin_name = cls.coins[coin].coin_name
		me.id = daemon_id
		me.proto = proto

		return me

	def __init__(self,
			network_id = None,
			proto      = None,
			opts       = None,
			flags      = None,
			test_suite = False,
			port_shift = None,
			p2p_port   = None,
			datadir    = None,
			daemon_id  = None ):

		self.test_suite = test_suite

		super().__init__(opts=opts,flags=flags)

		self._set_ok += ('shared_args','usr_coind_args')
		self.shared_args = []
		self.usr_coind_args = []

		for k,v in self.daemon_data._asdict().items():
			setattr(self,k,v)

		self.desc = '{} {} {}daemon'.format(
			self.coind_name,
			getattr(self.proto.network_names,self.network),
			'test suite ' if test_suite else '' )

		# user-set values take precedence
		self.datadir = os.path.abspath(datadir or g.daemon_data_dir or self.init_datadir())
		self.non_dfl_datadir = bool(datadir or g.daemon_data_dir or test_suite or self.network == 'regtest')

		# init_datadir() may have already initialized logdir
		self.logdir = os.path.abspath(getattr(self,'logdir',self.datadir))

		ps_adj = (port_shift or 0) + (self.test_suite_port_shift if test_suite else 0)

		# user-set values take precedence
		self.rpc_port = (g.rpc_port or 0) + (port_shift or 0) if g.rpc_port else ps_adj + self.get_rpc_port()
		self.p2p_port = (
			p2p_port or (
				self.get_p2p_port() + ps_adj if self.get_p2p_port() and (test_suite or ps_adj) else None
			) if self.network != 'regtest' else None )

		if hasattr(self,'private_ports'):
			self.private_port = getattr(self.private_ports,self.network)

		# bind_port == self.private_port or self.rpc_port
		self.pidfile = '{}/{}-{}-daemon-{}.pid'.format(self.logdir,self.id,self.network,self.bind_port)
		self.logfile = '{}/{}-{}-daemon-{}.log'.format(self.logdir,self.id,self.network,self.bind_port)

		self.init_subclass()

	def init_datadir(self):
		if self.test_suite:
			return os.path.join('test','daemons',self.network_id)
		else:
			return os.path.join(*self.datadirs[self.platform])

	@property
	def network_datadir(self):
		return self.datadir

	def get_rpc_port(self):
		return getattr(self.rpc_ports,self.network)

	def get_p2p_port(self):
		return None

	@property
	def start_cmd(self):
		return ([self.exec_fn]
				+ self.coind_args
				+ self.shared_args
				+ self.usr_coind_args )

	def cli_cmd(self,*cmds):
		return ([self.cli_fn]
				+ self.shared_args
				+ list(cmds) )

	def start(self,*args,**kwargs):
		assert self.test_suite or self.network == 'regtest', 'start() restricted to test suite and regtest'
		return super().start(*args,**kwargs)

	def stop(self,*args,**kwargs):
		assert self.test_suite or self.network == 'regtest', 'stop() restricted to test suite and regtest'
		return super().stop(*args,**kwargs)

	def pre_start(self):
		os.makedirs(self.datadir,exist_ok=True)

		if self.test_suite or self.network == 'regtest':
			if self.cfg_file and not self.flag.keep_cfg_file:
				with open(f'{self.datadir}/{self.cfg_file}','w') as fp:
					fp.write(self.cfg_file_hdr)

		if self.use_pidfile and os.path.exists(self.pidfile):
			# Parity overwrites the data in the existing pidfile without zeroing it first, leading
			# to interesting consequences when the new PID has fewer digits than the previous one.
			os.unlink(self.pidfile)

	def remove_datadir(self):
		"remove the network's datadir"
		assert self.test_suite, 'datadir removal restricted to test suite'
		if self.state == 'stopped':
			run([
				('rm' if g.platform == 'win' else '/bin/rm'),
				'-rf',
				self.datadir ])
			set_vt100()
		else:
			msg(f'Cannot remove {self.network_datadir!r} - daemon is not stopped')