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pnmp.py
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pnmp.py
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#!/usr/bin/env python
# coding: utf-8
#
# Python API for the PNMP protocol
#
import serial
from serial.tools import list_ports
import time
import math
config = {
'num_cores' : 2,
'num_distro_ports': 4,
'num_bits_per_shiftregister': 8
}
class api():
""" The Pizza-Netmap Network Monitoring Protocol api """
PUSHSTATE = [0xF0, 0xF1] #1 bit signaling command and not data (first)
WRITE_LED = [0xF2]
def __init__(self, COM_PORT, BAUD_RATE=9600):
try:
# Opening a serial connection to the arduino :).
self.arduino = serial.Serial(COM_PORT, BAUD_RATE, bytesize=8, timeout=2 )
# The arduino will now reset. Lets wait for it to
# finish its boot sequence :).
print ("Pizza in owen...")
time.sleep(3)
print ("The Pizza is alive!")
#self.arduino.write("hello\n")
self.arduino.flush()
#waiting for the reset of the arduino to finish.
#print (self.arduino.timeout)
#flushing the buffer.
#self.arduino.flushOutput()
except Exception as e:
print ("error, %s" % e )
self.clean_the_mess_up_after_you() #die
def mapNodes(self, nodemap):
"""
This function is mapping a network node id
(like hostname, sysname switchname etc) with a
corresponding hardware address on the pizzanetmap.
arguments:
-nodemap = { nodeid1 : hwaddr1, nodeid2 : hwaddr2 ... }
returns:
0 on success, -1 on error.
"""
pass
def mapNode(self, node, hwaddr):
"""
This function is mapping ONE network node id
(like hostname, sysname switchname etc) with a
corresponding hardware address on the pizzanetmap.
arguments:
-node = <string> (nodeid)
-hwaddr = <u-int32> (core.distro.group.pin)
returns:
0 on success, -1 on error.
"""
pass
def getMappedNodes(self):
"""
This function retrives the current active node map (nodeid --> hwaddr) from the pizzanetmap.
arguments:
N/A
returns: -nodemap (<dict>) = { nodeid1 : hwaddr1, nodeid2 : hwaddr2 ... }
"""
pass
def getNodeHwAddr(self, node):
"""
This function queries the hardware address of a specific node from the pizzanetmap.
arguments:
-node = <string> unique id.
returns:
-hwaddr = <u-int32> (core.distro.group.pin)
throws:
-NoSuchNodeException
"""
pass
def pushState(self, statemap):
"""
This function pushes states of all nodes to the pizzanetmap.
arguments:
statemap = { nodeid1(<string>): state1(<boolean>), ...}
returns:
0 on success -1 on error.
"""
bits = ''
b = 0
# Start pushstate
self.arduino.write(chr( self.PUSHSTATE [0] ) )
#import pdb; pdb.set_trace()
# Sending 7bits at a time.
chunks = int( len(statemap) / 7 ) + (1 if len(statemap)%7 > 0 else 0);
c = chunks
data = '0'
bits_sent = 0
for switch in statemap:
# Translating on/off to 1/0
bit = '0' if switch[1].lower() == "off" else '1'
# Adding the bit to the chunk to be sent
data += bit
b+=1
# Checks if we have a chunk to send
if (b==7):
self.arduino.write( chr(int(data, 2)))
print ( "Data to arduino: %s" % data )
b=0
data = '0'
c -=1
bits_sent += 7
#last chunk:
if (bits_sent < len(statemap)):
bits_sent += len(data) - 1
pad = '0' * ( 8 - ( len(statemap)-bits_sent) )
self.arduino.write(
chr( int( pad + data, 2 ) )
)
print ( "Data to arduino: %s" % data )
print ("Sent %d chunks and %d bits" % (chunks, bits_sent))
# End of transmit
self.arduino.write(chr( self.PUSHSTATE [1] ) )
def getState(self):
"""
This function retrives the current active node map (nodeid --> hwaddr) from the pizzanetmap.
arguments:
N/A
returns:
statemap = { nodeid1(<string>): state1(<boolean>), ...}
"""
pass
def getNodeInfo(self, node):
"""
This function retrives a tripple of (nodeid, state, hwaddr)
for a given node from the pizzanetmap.
arguments:
node: nodeid1(<string>)
returns:
statemap = { nodeid1(<string>): state1(<boolean>), ...}
"""
pass
def getNodeCount(self, line=-1):
"""
This function retrives a the node count of a given line on the pizzanetmap (a core switch). If -1 is given as line argument, it will give all node count.
arguments:
line: uint (core id)
returns:
string of count.
"""
while True:
data = self.arduino.readline()
if len(data) > 0:
return data
def clean_the_mess_up_after_you(self):
self.arduino.close()