Onionr/onionr/communicator2.py

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2018-06-10 08:00:01 +00:00
#!/usr/bin/env python3
'''
Onionr - P2P Microblogging Platform & Social network.
This file contains both the OnionrCommunicate class for communcating with peers
and code to operate as a daemon, getting commands from the command queue database (see core.Core.daemonQueue)
'''
'''
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 <https://www.gnu.org/licenses/>.
'''
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import sys, os, core, config, json, requests, time, logger, threading, base64, onionr
import onionrexceptions, onionrpeers, onionrevents as events, onionrplugins as plugins, onionrblockapi as block
import onionrdaemontools
from defusedxml import minidom
class OnionrCommunicatorDaemon:
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def __init__(self, debug, developmentMode):
# list of timer instances
self.timers = []
# initalize core with Tor socks port being 3rd argument
self.proxyPort = sys.argv[2]
self._core = core.Core(torPort=self.proxyPort)
# intalize NIST beacon salt and time
self.nistSaltTimestamp = 0
self.powSalt = 0
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self.blockToUpload = ''
# loop time.sleep delay in seconds
self.delay = 1
# time app started running for info/statistics purposes
self.startTime = self._core._utils.getEpoch()
# lists of connected peers and peers we know we can't reach currently
self.onlinePeers = []
self.offlinePeers = []
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self.peerProfiles = [] # list of peer's profiles (onionrpeers.PeerProfile instances)
# amount of threads running by name, used to prevent too many
self.threadCounts = {}
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# set true when shutdown command recieved
self.shutdown = False
# list of new blocks to download, added to when new block lists are fetched from peers
self.blockQueue = []
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# list of blocks currently downloading, avoid s
self.currentDownloading = []
# Clear the daemon queue for any dead messages
if os.path.exists(self._core.queueDB):
self._core.clearDaemonQueue()
# Loads in and starts the enabled plugins
plugins.reload()
# daemon tools are misc daemon functions, e.g. announce to online peers
# intended only for use by OnionrCommunicatorDaemon
#self.daemonTools = onionrdaemontools.DaemonTools(self)
self.daemonTools = onionrdaemontools.DaemonTools(self)
if debug or developmentMode:
OnionrCommunicatorTimers(self, self.heartbeat, 10)
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# Print nice header thing :)
if config.get('general.display_header', True) and not self.shutdown:
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self.header()
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# Set timers, function reference, seconds
# requiresPeer True means the timer function won't fire if we have no connected peers
# TODO: make some of these timer counts configurable
OnionrCommunicatorTimers(self, self.daemonCommands, 5)
OnionrCommunicatorTimers(self, self.detectAPICrash, 5)
peerPoolTimer = OnionrCommunicatorTimers(self, self.getOnlinePeers, 60)
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OnionrCommunicatorTimers(self, self.lookupBlocks, 7, requiresPeer=True, maxThreads=1)
OnionrCommunicatorTimers(self, self.getBlocks, 10, requiresPeer=True)
OnionrCommunicatorTimers(self, self.clearOfflinePeer, 58)
OnionrCommunicatorTimers(self, self.lookupKeys, 60, requiresPeer=True)
OnionrCommunicatorTimers(self, self.lookupAdders, 60, requiresPeer=True)
announceTimer = OnionrCommunicatorTimers(self, self.daemonTools.announceNode, 305, requiresPeer=True, maxThreads=1)
cleanupTimer = OnionrCommunicatorTimers(self, self.peerCleanup, 300, requiresPeer=True)
# set loop to execute instantly to load up peer pool (replaced old pool init wait)
peerPoolTimer.count = (peerPoolTimer.frequency - 1)
cleanupTimer.count = (cleanupTimer.frequency - 60)
announceTimer.count = (cleanupTimer.frequency - 60)
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# Main daemon loop, mainly for calling timers, don't do any complex operations here to avoid locking
try:
while not self.shutdown:
for i in self.timers:
if self.shutdown:
break
i.processTimer()
time.sleep(self.delay)
except KeyboardInterrupt:
self.shutdown = True
pass
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logger.info('Goodbye.')
self._core._utils.localCommand('shutdown')
time.sleep(0.5)
def lookupKeys(self):
'''Lookup new keys'''
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logger.debug('Looking up new keys...')
tryAmount = 1
for i in range(tryAmount):
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# Download new key list from random online peers
peer = self.pickOnlinePeer()
newKeys = self.peerAction(peer, action='kex')
self._core._utils.mergeKeys(newKeys)
self.decrementThreadCount('lookupKeys')
return
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def lookupAdders(self):
'''Lookup new peer addresses'''
logger.info('LOOKING UP NEW ADDRESSES')
tryAmount = 1
for i in range(tryAmount):
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# Download new peer address list from random online peers
peer = self.pickOnlinePeer()
newAdders = self.peerAction(peer, action='pex')
self._core._utils.mergeAdders(newAdders)
self.decrementThreadCount('lookupAdders')
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def lookupBlocks(self):
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'''Lookup new blocks & add them to download queue'''
logger.info('LOOKING UP NEW BLOCKS')
tryAmount = 2
newBlocks = ''
existingBlocks = self._core.getBlockList()
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triedPeers = [] # list of peers we've tried this time around
for i in range(tryAmount):
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peer = self.pickOnlinePeer() # select random online peer
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# if we've already tried all the online peers this time around, stop
if peer in triedPeers:
if len(self.onlinePeers) == len(triedPeers):
break
else:
continue
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newDBHash = self.peerAction(peer, 'getDBHash') # get their db hash
if newDBHash == False:
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continue # if request failed, restart loop (peer is added to offline peers automatically)
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triedPeers.append(peer)
if newDBHash != self._core.getAddressInfo(peer, 'DBHash'):
self._core.setAddressInfo(peer, 'DBHash', newDBHash)
try:
newBlocks = self.peerAction(peer, 'getBlockHashes')
except Exception as error:
logger.warn("could not get new blocks with " + peer, error=error)
newBlocks = False
if newBlocks != False:
# if request was a success
for i in newBlocks.split('\n'):
if self._core._utils.validateHash(i):
# if newline seperated string is valid hash
if not i in existingBlocks:
# if block does not exist on disk and is not already in block queue
if i not in self.blockQueue and not self._core._blacklist.inBlacklist(i):
self.blockQueue.append(i)
self.decrementThreadCount('lookupBlocks')
return
def getBlocks(self):
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'''download new blocks in queue'''
for blockHash in self.blockQueue:
if self.shutdown:
break
if blockHash in self.currentDownloading:
logger.debug('ALREADY DOWNLOADING ' + blockHash)
continue
self.currentDownloading.append(blockHash)
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logger.info("Attempting to download %s..." % blockHash)
peerUsed = self.pickOnlinePeer()
content = self.peerAction(peerUsed, 'getData', data=blockHash) # block content from random peer (includes metadata)
if content != False:
try:
content = content.encode()
except AttributeError:
pass
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content = base64.b64decode(content) # content is base64 encoded in transport
realHash = self._core._crypto.sha3Hash(content)
try:
realHash = realHash.decode() # bytes on some versions for some reason
except AttributeError:
pass
if realHash == blockHash:
content = content.decode() # decode here because sha3Hash needs bytes above
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metas = self._core._utils.getBlockMetadataFromData(content) # returns tuple(metadata, meta), meta is also in metadata
metadata = metas[0]
#meta = metas[1]
if self._core._utils.validateMetadata(metadata, metas[2]): # check if metadata is valid, and verify nonce
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if self._core._crypto.verifyPow(content): # check if POW is enough/correct
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logger.info('Block passed proof, saving.')
self._core.setData(content)
self._core.addToBlockDB(blockHash, dataSaved=True)
self._core._utils.processBlockMetadata(blockHash) # caches block metadata values to block database
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else:
logger.warn('POW failed for block ' + blockHash)
else:
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logger.warn('Metadata for ' + blockHash + ' is invalid.')
else:
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# if block didn't meet expected hash
tempHash = self._core._crypto.sha3Hash(content) # lazy hack, TODO use var
try:
tempHash = tempHash.decode()
except AttributeError:
pass
# Punish peer for sharing invalid block (not always malicious, but is bad regardless)
onionrpeers.PeerProfiles(peerUsed, self._core).addScore(-50)
logger.warn('Block hash validation failed for ' + blockHash + ' got ' + tempHash)
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self.blockQueue.remove(blockHash) # remove from block queue both if success or false
self.currentDownloading.remove(blockHash)
self.decrementThreadCount('getBlocks')
return
def pickOnlinePeer(self):
'''randomly picks peer from pool without bias (using secrets module)'''
retData = ''
while True:
peerLength = len(self.onlinePeers)
if peerLength <= 0:
break
try:
# get a random online peer, securely. May get stuck in loop if network is lost or if all peers in pool magically disconnect at once
retData = self.onlinePeers[self._core._crypto.secrets.randbelow(peerLength)]
except IndexError:
pass
else:
break
return retData
def decrementThreadCount(self, threadName):
'''Decrement amount of a thread name if more than zero, called when a function meant to be run in a thread ends'''
try:
if self.threadCounts[threadName] > 0:
self.threadCounts[threadName] -= 1
except KeyError:
pass
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def clearOfflinePeer(self):
'''Removes the longest offline peer to retry later'''
try:
removed = self.offlinePeers.pop(0)
except IndexError:
pass
else:
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logger.debug('Removed ' + removed + ' from offline list, will try them again.')
self.decrementThreadCount('clearOfflinePeer')
def getOnlinePeers(self):
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'''Manages the self.onlinePeers attribute list, connects to more peers if we have none connected'''
logger.info('Refreshing peer pool.')
maxPeers = 6
needed = maxPeers - len(self.onlinePeers)
for i in range(needed):
if len(self.onlinePeers) == 0:
self.connectNewPeer(useBootstrap=True)
else:
self.connectNewPeer()
if self.shutdown:
break
else:
if len(self.onlinePeers) == 0:
logger.warn('Could not connect to any peer.')
self.decrementThreadCount('getOnlinePeers')
def addBootstrapListToPeerList(self, peerList):
'''Add the bootstrap list to the peer list (no duplicates)'''
for i in self._core.bootstrapList:
if i not in peerList and i not in self.offlinePeers and i != self._core.hsAddress:
peerList.append(i)
self._core.addAddress(i)
def connectNewPeer(self, peer='', useBootstrap=False):
'''Adds a new random online peer to self.onlinePeers'''
retData = False
tried = self.offlinePeers
if peer != '':
if self._core._utils.validateID(peer):
peerList = [peer]
else:
raise onionrexceptions.InvalidAddress('Will not attempt connection test to invalid address')
else:
peerList = self._core.listAdders()
peerList = onionrpeers.getScoreSortedPeerList(self._core)
if len(peerList) == 0 or useBootstrap:
# Avoid duplicating bootstrap addresses in peerList
self.addBootstrapListToPeerList(peerList)
for address in peerList:
if len(address) == 0 or address in tried or address in self.onlinePeers:
continue
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if self.shutdown:
return
if self.peerAction(address, 'ping') == 'pong!':
logger.info('Connected to ' + address)
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time.sleep(0.1)
if address not in self.onlinePeers:
self.onlinePeers.append(address)
retData = address
# add peer to profile list if they're not in it
for profile in self.peerProfiles:
if profile.address == address:
break
else:
self.peerProfiles.append(onionrpeers.PeerProfiles(address, self._core))
break
else:
tried.append(address)
logger.debug('Failed to connect to ' + address)
return retData
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def peerCleanup(self):
'''This just calls onionrpeers.cleanupPeers, which removes dead or bad peers (offline too long, too slow)'''
onionrpeers.peerCleanup(self._core)
self.decrementThreadCount('peerCleanup')
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def printOnlinePeers(self):
'''logs online peer list'''
if len(self.onlinePeers) == 0:
logger.warn('No online peers')
else:
logger.info('Online peers:')
for i in self.onlinePeers:
score = str(self.getPeerProfileInstance(i).score)
logger.info(i + ', score: ' + score)
def peerAction(self, peer, action, data=''):
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'''Perform a get request to a peer'''
if len(peer) == 0:
return False
logger.info('Performing ' + action + ' with ' + peer + ' on port ' + str(self.proxyPort))
url = 'http://' + peer + '/public/?action=' + action
if len(data) > 0:
url += '&data=' + data
self._core.setAddressInfo(peer, 'lastConnectAttempt', self._core._utils.getEpoch()) # mark the time we're trying to request this peer
retData = self._core._utils.doGetRequest(url, port=self.proxyPort)
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# if request failed, (error), mark peer offline
if retData == False:
try:
self.getPeerProfileInstance(peer).addScore(-10)
self.onlinePeers.remove(peer)
self.getOnlinePeers() # Will only add a new peer to pool if needed
except ValueError:
pass
else:
self._core.setAddressInfo(peer, 'lastConnect', self._core._utils.getEpoch())
self.getPeerProfileInstance(peer).addScore(1)
return retData
def getPeerProfileInstance(self, peer):
'''Gets a peer profile instance from the list of profiles, by address name'''
for i in self.peerProfiles:
# if the peer's profile is already loaded, return that
if i.address == peer:
retData = i
break
else:
# if the peer's profile is not loaded, return a new one. connectNewPeer adds it the list on connect
retData = onionrpeers.PeerProfiles(peer, self._core)
return retData
def heartbeat(self):
'''Show a heartbeat debug message'''
currentTime = self._core._utils.getEpoch() - self.startTime
logger.debug('heartbeat, running seconds: ' + str(currentTime))
self.decrementThreadCount('heartbeat')
def daemonCommands(self):
'''process daemon commands from daemonQueue'''
cmd = self._core.daemonQueue()
if cmd is not False:
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events.event('daemon_command', onionr = None, data = {'cmd' : cmd})
if cmd[0] == 'shutdown':
self.shutdown = True
elif cmd[0] == 'announceNode':
self.announce(cmd[1])
elif cmd[0] == 'runCheck':
logger.debug('Status check; looks good.')
open('data/.runcheck', 'w+').close()
elif cmd[0] == 'connectedPeers':
self.printOnlinePeers()
elif cmd[0] == 'kex':
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for i in self.timers:
if i.timerFunction.__name__ == 'lookupKeys':
i.count = (i.frequency - 1)
elif cmd[0] == 'pex':
for i in self.timers:
if i.timerFunction.__name__ == 'lookupAdders':
i.count = (i.frequency - 1)
elif cmd[0] == 'uploadBlock':
self.blockToUpload = cmd[1]
threading.Thread(target=self.uploadBlock).start()
else:
logger.info('Recieved daemonQueue command:' + cmd[0])
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self.decrementThreadCount('daemonCommands')
def uploadBlock(self):
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'''Upload our block to a few peers'''
# when inserting a block, we try to upload it to a few peers to add some deniability
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triedPeers = []
if not self._core._utils.validateHash(self.blockToUpload):
logger.warn('Requested to upload invalid block')
return
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for i in range(max(len(self.onlinePeers), 2)):
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peer = self.pickOnlinePeer()
if peer in triedPeers:
continue
triedPeers.append(peer)
url = 'http://' + peer + '/public/upload/'
data = {'block': block.Block(self.blockToUpload).getRaw()}
proxyType = ''
if peer.endswith('.onion'):
proxyType = 'tor'
elif peer.endswith('.i2p'):
proxyType = 'i2p'
logger.info("Uploading block")
self._core._utils.doPostRequest(url, data=data, proxyType=proxyType)
def announce(self, peer):
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'''Announce to peers our address'''
if self.daemonTools.announceNode():
logger.info('Successfully introduced node to ' + peer)
else:
logger.warn('Could not introduce node.')
def detectAPICrash(self):
'''exit if the api server crashes/stops'''
if self._core._utils.localCommand('ping', silent=False) != 'pong':
for i in range(5):
if self._core._utils.localCommand('ping') == 'pong':
break # break for loop
time.sleep(1)
else:
# This executes if the api is NOT detected to be running
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events.event('daemon_crash', onionr = None, data = {})
logger.error('Daemon detected API crash (or otherwise unable to reach API after long time), stopping...')
self.shutdown = True
self.decrementThreadCount('detectAPICrash')
def header(self, message = logger.colors.fg.pink + logger.colors.bold + 'Onionr' + logger.colors.reset + logger.colors.fg.pink + ' has started.'):
if os.path.exists('static-data/header.txt'):
with open('static-data/header.txt', 'rb') as file:
# only to stdout, not file or log or anything
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sys.stderr.write(file.read().decode().replace('P', logger.colors.fg.pink).replace('W', logger.colors.reset + logger.colors.bold).replace('G', logger.colors.fg.green).replace('\n', logger.colors.reset + '\n').replace('B', logger.colors.bold).replace('V', onionr.ONIONR_VERSION))
logger.info(logger.colors.fg.lightgreen + '-> ' + str(message) + logger.colors.reset + logger.colors.fg.lightgreen + ' <-\n')
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class OnionrCommunicatorTimers:
def __init__(self, daemonInstance, timerFunction, frequency, makeThread=True, threadAmount=1, maxThreads=5, requiresPeer=False):
self.timerFunction = timerFunction
self.frequency = frequency
self.threadAmount = threadAmount
self.makeThread = makeThread
self.requiresPeer = requiresPeer
self.daemonInstance = daemonInstance
self.maxThreads = maxThreads
self._core = self.daemonInstance._core
self.daemonInstance.timers.append(self)
self.count = 0
def processTimer(self):
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# mark how many instances of a thread we have (decremented at thread end)
try:
self.daemonInstance.threadCounts[self.timerFunction.__name__]
except KeyError:
self.daemonInstance.threadCounts[self.timerFunction.__name__] = 0
# execute thread if it is time, and we are not missing *required* online peer
if self.count == self.frequency:
try:
if self.requiresPeer and len(self.daemonInstance.onlinePeers) == 0:
raise onionrexceptions.OnlinePeerNeeded
except onionrexceptions.OnlinePeerNeeded:
pass
else:
if self.makeThread:
for i in range(self.threadAmount):
if self.daemonInstance.threadCounts[self.timerFunction.__name__] >= self.maxThreads:
logger.warn(self.timerFunction.__name__ + ' has too many current threads to start anymore.')
else:
self.daemonInstance.threadCounts[self.timerFunction.__name__] += 1
newThread = threading.Thread(target=self.timerFunction)
newThread.start()
else:
self.timerFunction()
self.count = -1 # negative 1 because its incremented at bottom
self.count += 1
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shouldRun = False
debug = True
developmentMode = False
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if config.get('general.dev_mode', True):
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developmentMode = True
try:
if sys.argv[1] == 'run':
shouldRun = True
except IndexError:
pass
if shouldRun:
try:
OnionrCommunicatorDaemon(debug, developmentMode)
except Exception as e:
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logger.error('Error occured in Communicator', error = e, timestamp = False)