add counter app in python
This commit is contained in:
Ethan Buchman
parent
4a0469d3ec
commit
bb4a58aa0a
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@ -45,6 +45,13 @@ func main() {
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cmdConsole(app, c)
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},
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},
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{
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Name: "echo",
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Usage: "Have the application echo a message",
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Action: func(c *cli.Context) {
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cmdEcho(c)
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},
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},
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{
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Name: "info",
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Usage: "Get some info about the application",
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@ -140,6 +147,19 @@ func cmdConsole(app *cli.App, c *cli.Context) {
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}
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}
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// Have the application echo a message
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func cmdEcho(c *cli.Context) {
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args := c.Args()
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if len(args) != 1 {
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Exit("echo takes 1 argument")
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}
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res, err := makeRequest(conn, types.RequestEcho{args[0]})
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if err != nil {
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Exit(err.Error())
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}
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fmt.Println(res)
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}
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// Get some info from the application
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func cmdInfo(c *cli.Context) {
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res, err := makeRequest(conn, types.RequestInfo{})
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@ -0,0 +1,83 @@
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import sys
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sys.path.insert(0, './tmsp')
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from wire import *
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from server import *
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# tmsp application interface
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class CounterApplication():
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def __init__(self):
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self.hashCount = 0
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self.txCount = 0
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self.commitCount = 0
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def open(self):
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return CounterAppContext(self)
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class CounterAppContext():
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def __init__(self, app):
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self.app = app
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self.hashCount = app.hashCount
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self.txCount = app.txCount
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self.commitCount = app.commitCount
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self.serial = False
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def echo(self, msg):
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return msg, 0
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def info(self):
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return ["hash, tx, commit counts:%d, %d, %d"%(self.hashCount, self.txCount, self.commitCount)], 0
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def set_option(self, key, value):
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if key == "serial" and value == "on":
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self.serial = True
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return 0
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def append_tx(self, txBytes):
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if self.serial:
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txValue = decode_big_endian(BytesReader(txBytes), len(txBytes))
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if txValue != self.txCount:
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return [], 1
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self.txCount += 1
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return None, 0
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def get_hash(self):
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self.hashCount += 1
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if self.txCount == 0:
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return "", 0
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return str(encode_big_endian(self.txCount, 8)), 0
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def commit(self):
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return 0
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def rollback(self):
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return 0
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def add_listener(self):
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return 0
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def rm_listener(self):
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return 0
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def event(self):
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return
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if __name__ == '__main__':
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l = len(sys.argv)
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if l == 1:
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port = 46658
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elif l == 2:
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port = int(sys.argv[1])
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else:
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print "too many arguments"
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quit()
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print 'TMSP Demo APP (Python)'
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app = CounterApplication()
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server = TMSPServer(app, port)
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server.main_loop()
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@ -0,0 +1,54 @@
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from wire import *
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# map type_byte to message name
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message_types = {
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0x01 : "echo",
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0x02 : "flush",
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0x03 : "info",
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0x04 : "set_option",
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0x21 : "append_tx",
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0x22 : "get_hash",
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0x23 : "commit",
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0x24 : "rollback",
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0x25 : "add_listener",
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0x26 : "rm_listener",
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}
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# return the decoded arguments of tmsp messages
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class RequestDecoder():
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def __init__(self, reader):
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self.reader = reader
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def echo(self):
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return decode_string(self.reader)
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def flush(self):
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return
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def info(self):
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return
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def set_option(self):
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return decode_string(self.reader), decode_string(self.reader)
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def append_tx(self):
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return decode_string(self.reader)
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def get_hash(self):
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return
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def commit(self):
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return
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def rollback(self):
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return
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def add_listener(self):
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# TODO
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return
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def rm_listener(self):
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# TODO
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return
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@ -0,0 +1,31 @@
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# Simple read() method around a bytearray
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class BytesReader():
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def __init__(self, b):
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self.buf = b
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def read(self, n):
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if len(self.buf) < n:
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# TODO: exception
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return
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r = self.buf[:n]
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self.buf = self.buf[n:]
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return r
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# Buffer bytes off a tcp connection and read them off in chunks
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class ConnReader():
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def __init__(self, conn):
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self.conn = conn
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self.buf = bytearray()
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# blocking
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def read(self, n):
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while n > len(self.buf):
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moreBuf = self.conn.recv(1024)
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if not moreBuf:
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raise IOError("dead connection")
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self.buf = self.buf + bytearray(moreBuf)
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r = self.buf[:n]
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self.buf = self.buf[n:]
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return r
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@ -0,0 +1,134 @@
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import socket
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import select
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import sys
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import os
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from wire import *
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from reader import *
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from msg import *
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# TMSP server responds to messges by calling methods on the app
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class TMSPServer():
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def __init__(self, app, port=5410):
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self.app = app
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self.appMap = {} # map conn file descriptors to (appContext, msgDecoder)
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self.port = port
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self.listen_backlog = 10
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self.listener = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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self.listener.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
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self.listener.setblocking(0)
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self.listener.bind(('', port))
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self.listener.listen(self.listen_backlog)
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self.shutdown = False
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self.read_list = [self.listener]
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self.write_list = []
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def handle_new_connection(self, r):
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new_fd, new_addr = r.accept()
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self.read_list.append(new_fd)
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self.write_list.append(new_fd)
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print 'new connection to', new_addr
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appContext = self.app.open()
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self.appMap[new_fd] = (appContext, RequestDecoder(ConnReader(new_fd)))
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def handle_conn_closed(self, r):
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self.read_list.remove(r)
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self.write_list.remove(r)
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r.close()
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print "connection closed"
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def handle_recv(self, r):
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appCtx, conn = self.appMap[r]
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response = bytearray()
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while True:
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try:
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# first read the request type and get the msg decoder
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typeByte = conn.reader.read(1)
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typeByte = int(typeByte[0])
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resTypeByte = typeByte+0x10
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req_type = message_types[typeByte]
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if req_type == "flush":
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response += bytearray([resTypeByte])
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sent = r.send(str(response))
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return
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decoder = getattr(conn, req_type)
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req_args = decoder()
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req_f = getattr(appCtx, req_type)
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if req_args == None:
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res = req_f()
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elif isinstance(req_args, tuple):
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res = req_f(*req_args)
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else:
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res = req_f(req_args)
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if isinstance(res, tuple):
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res, ret_code = res
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else:
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ret_code = res
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res = None
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if ret_code != 0:
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print "non-zero retcode:", ret_code
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return
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if req_type in ("echo", "info"): # these dont return a ret code
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response += bytearray([resTypeByte]) + encode(res)
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else:
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response += bytearray([resTypeByte]) + encode(ret_code) + encode(res)
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except TypeError as e:
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print "TypeError on reading from connection:", e
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self.handle_conn_closed(r)
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return
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except ValueError as e:
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print "ValueError on reading from connection:", e
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self.handle_conn_closed(r)
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return
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except IOError as e:
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print "IOError on reading from connection:", e
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self.handle_conn_closed(r)
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return
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except:
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print "error reading from connection", sys.exc_info()[0] # TODO better
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self.handle_conn_closed(r)
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return
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def main_loop(self):
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while not self.shutdown:
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r_list, w_list, _ = select.select(self.read_list, self.write_list, [], 2.5)
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for r in r_list:
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if (r == self.listener):
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try:
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self.handle_new_connection(r)
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# undo adding to read list ...
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except NameError as e:
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print "Could not connect due to NameError:", e
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except TypeError as e:
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print "Could not connect due to TypeError:", e
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except:
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print "Could not connect due to unexpected error:", sys.exc_info()[0]
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else:
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self.handle_recv(r)
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def handle_shutdown(self):
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for r in self.read_list:
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r.close()
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for w in self.write_list:
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try:
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w.close()
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except: pass
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self.shutdown = True
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@ -0,0 +1,99 @@
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# the decoder works off a reader
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# the encoder returns bytearray
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def bytes2hex(b):
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if type(b) in (str, unicode):
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return "".join([hex(ord(c))[2:].zfill(2) for c in b])
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else:
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return bytes2hex(b.decode())
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# expects uvarint64 (no crazy big nums!)
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def uvarint_size(i):
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if i == 0:
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return 0
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for j in xrange(1, 8):
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if i < 1<<j*8:
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return j
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return 8
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# expects i < 2**size
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def encode_big_endian(i, size):
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if size == 0:
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return bytearray()
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return encode_big_endian(i/256, size-1) + bytearray([i%256])
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def decode_big_endian(reader, size):
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if size == 0:
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return 0
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firstByte = reader.read(1)[0]
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return firstByte*(256**(size-1)) + decode_big_endian(reader, size-1)
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# ints are max 16 bytes long
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def encode_varint(i):
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negate = False
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if i < 0:
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negate = True
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i = -i
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size = uvarint_size(i)
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if size == 0:
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return bytearray([0])
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big_end = encode_big_endian(i, size)
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if negate:
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size += 0xF0
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return bytearray([size]) + big_end
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# returns the int and whats left of the byte array
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def decode_varint(reader):
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size = reader.read(1)[0]
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if size == 0:
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return 0
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negate = True if size > int(0xF0) else False
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if negate: size = size -0xF0
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i = decode_big_endian(reader, size)
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if negate: i = i*(-1)
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return i
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def encode_string(s):
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size = encode_varint(len(s))
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return size + bytearray(s)
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def decode_string(reader):
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length = decode_varint(reader)
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return str(reader.read(length))
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def encode_list(s):
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b = bytearray()
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map(b.extend, map(encode, s))
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return encode_varint(len(s)) + b
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def encode(s):
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if s == None:
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return bytearray()
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if isinstance(s, int):
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return encode_varint(s)
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elif isinstance(s, str):
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return encode_string(s)
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elif isinstance(s, list):
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return encode_list(s)
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else:
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print "UNSUPPORTED TYPE!", type(s), s
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import binascii
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if __name__ == '__main__':
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ns = [100,100,1000,256]
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ss = [2,5,5,2]
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bs = map(encode_big_endian, ns,ss)
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ds = map(decode_big_endian, bs,ss)
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print ns
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print [i[0] for i in ds]
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ss = ["abc", "hi there jim", "ok now what"]
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e = map(encode_string, ss)
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d = map(decode_string, e)
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print ss
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print [i[0] for i in d]
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