-## Copyright 2002-2003 Andrew Loewenstern, All Rights Reserved
+## Copyright 2002-2004 Andrew Loewenstern, All Rights Reserved
# see LICENSE.txt for license information
-from const import reactor
-import const
-
-import time
-
-from sha import sha
+from time import time
+from random import randrange
+import sqlite ## find this at http://pysqlite.sourceforge.net/
-from ktable import KTable, K
-from knode import KNode as Node
+from twisted.internet.defer import Deferred
+from twisted.internet import protocol
+from twisted.internet import reactor
+import const
+from ktable import KTable
+from knode import KNodeBase, KNodeRead, KNodeWrite
from khash import newID, newIDInRange
-
from actions import FindNode, GetValue, KeyExpirer, StoreValue
import krpc
-from twisted.internet.defer import Deferred
-from twisted.internet import protocol
-from twisted.python import threadable
-from twisted.application import service, internet
-from twisted.web import server
-threadable.init()
-import sys
-
-import sqlite ## find this at http://pysqlite.sourceforge.net/
-
class KhashmirDBExcept(Exception):
pass
-# this is the main class!
-class Khashmir(protocol.Factory):
- __slots__ = ('listener', 'node', 'table', 'store', 'app', 'last', 'protocol')
+# this is the base class, has base functionality and find node, no key-value mappings
+class KhashmirBase(protocol.Factory):
+ _Node = KNodeBase
def __init__(self, host, port, db='khashmir.db'):
self.setup(host, port, db)
self.port = port
self.node = self._loadSelfNode(host, port)
self.table = KTable(self.node)
- self.app = service.Application("krpc")
+ #self.app = service.Application("krpc")
self.udp = krpc.hostbroker(self)
self.udp.protocol = krpc.KRPC
self.listenport = reactor.listenUDP(port, self.udp)
- self.last = time.time()
+ self.last = time()
self._loadRoutingTable()
KeyExpirer(store=self.store)
- #self.refreshTable(force=1)
+ self.refreshTable(force=1)
reactor.callLater(60, self.checkpoint, (1,))
-
+
+ def Node(self):
+ n = self._Node()
+ n.table = self.table
+ return n
+
def __del__(self):
self.listenport.stopListening()
id = c.fetchone()[0]
else:
id = newID()
- return Node().init(id, host, port)
+ return self._Node().init(id, host, port)
def _saveSelfNode(self):
- self.store.autocommit = 0
c = self.store.cursor()
c.execute('delete from self where num = 0;')
c.execute("insert into self values (0, %s);", sqlite.encode(self.node.id))
self.store.commit()
- self.store.autocommit = 1
def checkpoint(self, auto=0):
self._saveSelfNode()
self._dumpRoutingTable()
+ self.refreshTable()
if auto:
- reactor.callLater(const.CHECKPOINT_INTERVAL, self.checkpoint)
+ reactor.callLater(randrange(int(const.CHECKPOINT_INTERVAL * .9), int(const.CHECKPOINT_INTERVAL * 1.1)), self.checkpoint, (1,))
def _findDB(self, db):
import os
def _loadDB(self, db):
try:
self.store = sqlite.connect(db=db)
- self.store.autocommit = 1
+ #self.store.autocommit = 0
except:
import traceback
- raise KhashmirDBExcept, "Couldn't open DB", traceback.exc_traceback
+ raise KhashmirDBExcept, "Couldn't open DB", traceback.format_exc()
def _createNewDB(self, db):
self.store = sqlite.connect(db=db)
- self.store.autocommit = 1
s = """
create table kv (key binary, value binary, time timestamp, primary key (key, value));
create index kv_key on kv(key);
"""
c = self.store.cursor()
c.execute(s)
+ self.store.commit()
def _dumpRoutingTable(self):
"""
save routing table nodes to the database
"""
- self.store.autocommit = 0;
c = self.store.cursor()
c.execute("delete from nodes where id not NULL;")
for bucket in self.table.buckets:
for node in bucket.l:
- d = node.senderDict()
- c.execute("insert into nodes values (%s, %s, %s);", (sqlite.encode(d['id']), d['host'], d['port']))
+ c.execute("insert into nodes values (%s, %s, %s);", (sqlite.encode(node.id), node.host, node.port))
self.store.commit()
- self.store.autocommit = 1;
def _loadRoutingTable(self):
"""
c = self.store.cursor()
c.execute("select * from nodes;")
for rec in c.fetchall():
- n = Node().initWithDict({'id':rec[0], 'host':rec[1], 'port':int(rec[2])})
+ n = self.Node().initWithDict({'id':rec[0], 'host':rec[1], 'port':int(rec[2])})
n.conn = self.udp.connectionForAddr((n.host, n.port))
self.table.insertNode(n, contacted=0)
"""
ping this node and add the contact info to the table on pong!
"""
- n =Node().init(const.NULL_ID, host, port)
+ n =self.Node().init(const.NULL_ID, host, port)
n.conn = self.udp.connectionForAddr((n.host, n.port))
self.sendPing(n, callback=callback)
else:
# create our search state
state = FindNode(self, id, d.callback)
- reactor.callFromThread(state.goWithNodes, nodes)
-
-
- ## also async
- def valueForKey(self, key, callback, searchlocal = 1):
- """ returns the values found for key in global table
- callback will be called with a list of values for each peer that returns unique values
- final callback will be an empty list - probably should change to 'more coming' arg
- """
- nodes = self.table.findNodes(key)
-
- # get locals
- if searchlocal:
- l = self.retrieveValues(key)
- if len(l) > 0:
- reactor.callLater(0, callback, (l))
- else:
- l = []
-
- # create our search state
- state = GetValue(self, key, callback)
- reactor.callFromThread(state.goWithNodes, nodes, l)
-
- ## async, callback indicates nodes we got a response from (but no guarantee they didn't drop it on the floor)
- def storeValueForKey(self, key, value, callback=None):
- """ stores the value for key in the global table, returns immediately, no status
- in this implementation, peers respond but don't indicate status to storing values
- a key can have many values
- """
- def _storeValueForKey(nodes, key=key, value=value, response=callback , table=self.table):
- if not response:
- # default callback
- def _storedValueHandler(sender):
- pass
- response=_storedValueHandler
- action = StoreValue(self.table, key, value, response)
- reactor.callFromThread(action.goWithNodes, nodes)
-
- # this call is asynch
- self.findNode(key, _storeValueForKey)
-
+ reactor.callLater(0, state.goWithNodes, nodes)
def insertNode(self, n, contacted=1):
"""
method needs to be a properly formed Node object with a valid ID.
"""
old = self.table.insertNode(n, contacted=contacted)
- if old and (time.time() - old.lastSeen) > const.MIN_PING_INTERVAL and old.id != self.node.id:
+ if old and (time() - old.lastSeen) > const.MIN_PING_INTERVAL and old.id != self.node.id:
# the bucket is full, check to see if old node is still around and if so, replace it
## these are the callbacks used when we ping the oldest node in a bucket
def _notStaleNodeHandler(dict, old=old):
""" called when we get a pong from the old node """
- _krpc_sender = dict['_krpc_sender']
dict = dict['rsp']
- sender = dict['sender']
- if sender['id'] == old.id:
+ if dict['id'] == old.id:
self.table.justSeenNode(old.id)
- df = old.ping(self.node.senderDict())
+ df = old.ping(self.node.id)
df.addCallbacks(_notStaleNodeHandler, _staleNodeHandler)
def sendPing(self, node, callback=None):
"""
ping a node
"""
- df = node.ping(self.node.senderDict())
+ df = node.ping(self.node.id)
## these are the callbacks we use when we issue a PING
def _pongHandler(dict, node=node, table=self.table, callback=callback):
_krpc_sender = dict['_krpc_sender']
dict = dict['rsp']
- sender = dict['sender']
- if node.id != const.NULL_ID and node.id != sender['id']:
- # whoah, got response from different peer than we were expecting
- self.table.invalidateNode(node)
- else:
- sender['host'] = node.host
- sender['port'] = node.port
- n = Node().initWithDict(sender)
- n.conn = self.udp.connectionForAddr((n.host, n.port))
- table.insertNode(n)
- if callback:
- callback()
+ sender = {'id' : dict['id']}
+ sender['host'] = _krpc_sender[0]
+ sender['port'] = _krpc_sender[1]
+ n = self.Node().initWithDict(sender)
+ n.conn = self.udp.connectionForAddr((n.host, n.port))
+ table.insertNode(n)
+ if callback:
+ callback()
def _defaultPong(err, node=node, table=self.table, callback=callback):
table.nodeFailed(node)
if callback:
pass
for bucket in self.table.buckets:
- if force or (time.time() - bucket.lastAccessed >= const.BUCKET_STALENESS):
+ if force or (time() - bucket.lastAccessed >= const.BUCKET_STALENESS):
id = newIDInRange(bucket.min, bucket.max)
self.findNode(id, callback)
+ def stats(self):
+ """
+ Returns (num_contacts, num_nodes)
+ num_contacts: number contacts in our routing table
+ num_nodes: number of nodes estimated in the entire dht
+ """
+ num_contacts = reduce(lambda a, b: a + len(b.l), self.table.buckets, 0)
+ num_nodes = const.K * (2**(len(self.table.buckets) - 1))
+ return (num_contacts, num_nodes)
+ def krpc_ping(self, id, _krpc_sender):
+ sender = {'id' : id}
+ sender['host'] = _krpc_sender[0]
+ sender['port'] = _krpc_sender[1]
+ n = self.Node().initWithDict(sender)
+ n.conn = self.udp.connectionForAddr((n.host, n.port))
+ self.insertNode(n, contacted=0)
+ return {"id" : self.node.id}
+
+ def krpc_find_node(self, target, id, _krpc_sender):
+ nodes = self.table.findNodes(target)
+ nodes = map(lambda node: node.senderDict(), nodes)
+ sender = {'id' : id}
+ sender['host'] = _krpc_sender[0]
+ sender['port'] = _krpc_sender[1]
+ n = self.Node().initWithDict(sender)
+ n.conn = self.udp.connectionForAddr((n.host, n.port))
+ self.insertNode(n, contacted=0)
+ return {"nodes" : nodes, "id" : self.node.id}
+
+
+## This class provides read-only access to the DHT, valueForKey
+## you probably want to use this mixin and provide your own write methods
+class KhashmirRead(KhashmirBase):
+ _Node = KNodeRead
def retrieveValues(self, key):
c = self.store.cursor()
c.execute("select value from kv where key = %s;", sqlite.encode(key))
l.append(t['value'])
t = c.fetchone()
return l
-
- #####
- ##### INCOMING MESSAGE HANDLERS
-
- def krpc_ping(self, sender, _krpc_sender):
- """
- takes sender dict = {'id', <id>, 'port', port} optional keys = 'ip'
- returns sender dict
+ ## also async
+ def valueForKey(self, key, callback, searchlocal = 1):
+ """ returns the values found for key in global table
+ callback will be called with a list of values for each peer that returns unique values
+ final callback will be an empty list - probably should change to 'more coming' arg
"""
- sender['host'] = _krpc_sender[0]
- sender['port'] = _krpc_sender[1]
- n = Node().initWithDict(sender)
- n.conn = self.udp.connectionForAddr((n.host, n.port))
- self.insertNode(n, contacted=0)
- return {"sender" : self.node.senderDict()}
+ nodes = self.table.findNodes(key)
- def krpc_find_node(self, target, sender, _krpc_sender):
- nodes = self.table.findNodes(target)
- nodes = map(lambda node: node.senderDict(), nodes)
+ # get locals
+ if searchlocal:
+ l = self.retrieveValues(key)
+ if len(l) > 0:
+ reactor.callLater(0, callback, (l))
+ else:
+ l = []
+
+ # create our search state
+ state = GetValue(self, key, callback)
+ reactor.callLater(0, state.goWithNodes, nodes, l)
+
+ def krpc_find_value(self, key, id, _krpc_sender):
+ sender = {'id' : id}
sender['host'] = _krpc_sender[0]
sender['port'] = _krpc_sender[1]
- n = Node().initWithDict(sender)
+ n = self.Node().initWithDict(sender)
n.conn = self.udp.connectionForAddr((n.host, n.port))
self.insertNode(n, contacted=0)
- return {"nodes" : nodes, "sender" : self.node.senderDict()}
+
+ l = self.retrieveValues(key)
+ if len(l) > 0:
+ return {'values' : l, "id": self.node.id}
+ else:
+ nodes = self.table.findNodes(key)
+ nodes = map(lambda node: node.senderDict(), nodes)
+ return {'nodes' : nodes, "id": self.node.id}
+
+### provides a generic write method, you probably don't want to deploy something that allows
+### arbitrary value storage
+class KhashmirWrite(KhashmirRead):
+ _Node = KNodeWrite
+ ## async, callback indicates nodes we got a response from (but no guarantee they didn't drop it on the floor)
+ def storeValueForKey(self, key, value, callback=None):
+ """ stores the value for key in the global table, returns immediately, no status
+ in this implementation, peers respond but don't indicate status to storing values
+ a key can have many values
+ """
+ def _storeValueForKey(nodes, key=key, value=value, response=callback , table=self.table):
+ if not response:
+ # default callback
+ def _storedValueHandler(sender):
+ pass
+ response=_storedValueHandler
+ action = StoreValue(self.table, key, value, response)
+ reactor.callLater(0, action.goWithNodes, nodes)
- def krpc_store_value(self, key, value, sender, _krpc_sender):
- t = "%0.6f" % time.time()
+ # this call is asynch
+ self.findNode(key, _storeValueForKey)
+
+ def krpc_store_value(self, key, value, id, _krpc_sender):
+ t = "%0.6f" % time()
c = self.store.cursor()
try:
c.execute("insert into kv values (%s, %s, %s);", (sqlite.encode(key), sqlite.encode(value), t))
except sqlite.IntegrityError, reason:
# update last insert time
c.execute("update kv set time = %s where key = %s and value = %s;", (t, sqlite.encode(key), sqlite.encode(value)))
+ self.store.commit()
+ sender = {'id' : id}
sender['host'] = _krpc_sender[0]
sender['port'] = _krpc_sender[1]
- n = Node().initWithDict(sender)
- n.conn = self.udp.connectionForAddr((n.host, n.port))
- self.insertNode(n, contacted=0)
- return {"sender" : self.node.senderDict()}
-
- def krpc_find_value(self, key, sender, _krpc_sender):
- sender['host'] = _krpc_sender[0]
- sender['port'] = _krpc_sender[1]
- n = Node().initWithDict(sender)
+ n = self.Node().initWithDict(sender)
n.conn = self.udp.connectionForAddr((n.host, n.port))
self.insertNode(n, contacted=0)
-
- l = self.retrieveValues(key)
- if len(l) > 0:
- return {'values' : l, "sender": self.node.senderDict()}
- else:
- nodes = self.table.findNodes(key)
- nodes = map(lambda node: node.senderDict(), nodes)
- return {'nodes' : nodes, "sender": self.node.senderDict()}
+ return {"id" : self.node.id}
+# the whole shebang, for testing
+class Khashmir(KhashmirWrite):
+ _Node = KNodeWrite
projects / quix0rs-apt-p2p.git / blobdiff