Onionr/onionr/communicatorutils/announcenode.py

'''
    Onionr - Private P2P Communication

    Use a communicator instance to announce our transport address to connected nodes
'''
'''
    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/>.
'''
import base64
import onionrproofs, logger
from etc import onionrvalues
from onionrutils import basicrequests, bytesconverter
from communicator import onlinepeers

def announce_node(daemon):
    '''Announce our node to our peers'''
    ov = onionrvalues.OnionrValues()
    retData = False
    announceFail = False
    
    # Do not let announceCache get too large
    if len(daemon.announceCache) >= 10000:
        daemon.announceCache.popitem()

    if daemon._core.config.get('general.security_level', 0) == 0:
        # Announce to random online peers
        for i in daemon.onlinePeers:
            if not i in daemon.announceCache and not i in daemon.announceProgress:
                peer = i
                break
        else:
            peer = onlinepeers.pick_online_peer(daemon)

        for x in range(1):
            if x == 1 and daemon._core.config.get('i2p.host'):
                ourID = daemon._core.config.get('i2p.own_addr').strip()
            else:
                ourID = daemon._core.hsAddress.strip()

            url = 'http://' + peer + '/announce'
            data = {'node': ourID}

            combinedNodes = ourID + peer
            if ourID != 1:
                #TODO: Extend existingRand for i2p
                existingRand = bytesconverter.bytes_to_str(daemon._core.getAddressInfo(peer, 'powValue'))
                # Reset existingRand if it no longer meets the minimum POW
                if type(existingRand) is type(None) or not existingRand.endswith('0' * ov.announce_pow):
                    existingRand = ''

            if peer in daemon.announceCache:
                data['random'] = daemon.announceCache[peer]
            elif len(existingRand) > 0:
                data['random'] = existingRand
            else:
                daemon.announceProgress[peer] = True
                proof = onionrproofs.DataPOW(combinedNodes, forceDifficulty=ov.announce_pow)
                del daemon.announceProgress[peer]
                try:
                    data['random'] = base64.b64encode(proof.waitForResult()[1])
                except TypeError:
                    # Happens when we failed to produce a proof
                    logger.error("Failed to produce a pow for announcing to " + peer)
                    announceFail = True
                else:
                    daemon.announceCache[peer] = data['random']
            if not announceFail:
                logger.info('Announcing node to ' + url)
                if basicrequests.do_post_request(daemon._core, url, data) == 'Success':
                    logger.info('Successfully introduced node to ' + peer, terminal=True)
                    retData = True
                    daemon._core.setAddressInfo(peer, 'introduced', 1)
                    daemon._core.setAddressInfo(peer, 'powValue', data['random'])
    daemon.decrementThreadCount('announce_node')
    return retData