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Document the DHT's knode module.
author
Cameron Dale
<camrdale@gmail.com>
Wed, 5 Mar 2008 00:03:28 +0000
(16:03 -0800)
committer
Cameron Dale
<camrdale@gmail.com>
Wed, 5 Mar 2008 00:03:28 +0000
(16:03 -0800)
apt_dht_Khashmir/knode.py
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diff --git
a/apt_dht_Khashmir/knode.py
b/apt_dht_Khashmir/knode.py
index ea714e603a4ffdd7fa752bf2d807db1779ef1298..e7fb6b3720a750a5c77bfa224105b20002f5c4fc 100644
(file)
--- a/
apt_dht_Khashmir/knode.py
+++ b/
apt_dht_Khashmir/knode.py
@@
-1,12
+1,17
@@
## Copyright 2002-2004 Andrew Loewenstern, All Rights Reserved
# see LICENSE.txt for license information
## Copyright 2002-2004 Andrew Loewenstern, All Rights Reserved
# see LICENSE.txt for license information
+"""Represents a khashmir node in the DHT."""
+
from twisted.python import log
from node import Node, NULL_ID
class KNodeBase(Node):
from twisted.python import log
from node import Node, NULL_ID
class KNodeBase(Node):
+ """A basic node that can only be pinged and help find other nodes."""
+
def checkSender(self, dict):
def checkSender(self, dict):
+ """Check the sender's info to make sure it meets expectations."""
try:
senderid = dict['rsp']['id']
except KeyError:
try:
senderid = dict['rsp']['id']
except KeyError:
@@
-20,42
+25,53
@@
class KNodeBase(Node):
return dict
def errBack(self, err):
return dict
def errBack(self, err):
+ """Log an error that has occurred."""
log.err(err)
return err
def ping(self, id):
log.err(err)
return err
def ping(self, id):
+ """Ping the node."""
df = self.conn.sendRequest('ping', {"id":id})
df.addErrback(self.errBack)
df.addCallback(self.checkSender)
return df
def join(self, id):
df = self.conn.sendRequest('ping', {"id":id})
df.addErrback(self.errBack)
df.addCallback(self.checkSender)
return df
def join(self, id):
+ """Use the node to bootstrap into the system."""
df = self.conn.sendRequest('join', {"id":id})
df.addErrback(self.errBack)
df.addCallback(self.checkSender)
return df
def findNode(self, id, target):
df = self.conn.sendRequest('join', {"id":id})
df.addErrback(self.errBack)
df.addCallback(self.checkSender)
return df
def findNode(self, id, target):
+ """Request the nearest nodes to the target that the node knows about."""
df = self.conn.sendRequest('find_node', {"target" : target, "id": id})
df.addErrback(self.errBack)
df.addCallback(self.checkSender)
return df
class KNodeRead(KNodeBase):
df = self.conn.sendRequest('find_node', {"target" : target, "id": id})
df.addErrback(self.errBack)
df.addCallback(self.checkSender)
return df
class KNodeRead(KNodeBase):
+ """More advanced node that can also find and send values."""
+
def findValue(self, id, key):
def findValue(self, id, key):
+ """Request the nearest nodes to the key that the node knows about."""
df = self.conn.sendRequest('find_value', {"key" : key, "id" : id})
df.addErrback(self.errBack)
df.addCallback(self.checkSender)
return df
def getValue(self, id, key, num):
df = self.conn.sendRequest('find_value', {"key" : key, "id" : id})
df.addErrback(self.errBack)
df.addCallback(self.checkSender)
return df
def getValue(self, id, key, num):
+ """Request the values that the node has for the key."""
df = self.conn.sendRequest('get_value', {"key" : key, "num": num, "id" : id})
df.addErrback(self.errBack)
df.addCallback(self.checkSender)
return df
class KNodeWrite(KNodeRead):
df = self.conn.sendRequest('get_value', {"key" : key, "num": num, "id" : id})
df.addErrback(self.errBack)
df.addCallback(self.checkSender)
return df
class KNodeWrite(KNodeRead):
+ """Most advanced node that can also store values."""
+
def storeValue(self, id, key, value, token):
def storeValue(self, id, key, value, token):
+ """Store a value in the node."""
df = self.conn.sendRequest('store_value', {"key" : key, "value" : value, "token" : token, "id": id})
df.addErrback(self.errBack)
df.addCallback(self.checkSender)
df = self.conn.sendRequest('store_value', {"key" : key, "value" : value, "token" : token, "id": id})
df.addErrback(self.errBack)
df.addCallback(self.checkSender)