mirror of
https://github.com/fluencelabs/tendermint
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python3 example
This commit is contained in:
tim watts
parent
1b7243a990
commit
65a0156412
92
example/python3/app.py
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92
example/python3/app.py
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import sys
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from tmsp.wire import hex2bytes, decode_big_endian, encode_big_endian
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from tmsp.server import TMSPServer
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from tmsp.reader import BytesBuffer
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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,
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self.txCount,
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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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txByteArray = bytearray(txBytes)
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if len(txBytes) >= 2 and txBytes[:2] == "0x":
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txByteArray = hex2bytes(txBytes[2:])
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txValue = decode_big_endian(
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BytesBuffer(txByteArray), len(txBytes))
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if txValue != self.txCount:
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return None, 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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h = encode_big_endian(self.txCount, 8)
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h.reverse()
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return str(h), 0
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def commit(self):
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self.commitCount += 1
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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
example/python3/tmsp/__init__.py
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0
example/python3/tmsp/__init__.py
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55
example/python3/tmsp/msg.py
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55
example/python3/tmsp/msg.py
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from .wire import decode_string
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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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56
example/python3/tmsp/reader.py
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56
example/python3/tmsp/reader.py
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# Simple read() method around a bytearray
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class BytesBuffer():
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def __init__(self, b):
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self.buf = b
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self.readCount = 0
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def count(self):
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return self.readCount
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def reset_count(self):
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self.readCount = 0
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def size(self):
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return len(self.buf)
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def peek(self):
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return self.buf[0]
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def write(self, b):
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# b should be castable to byte array
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self.buf += bytearray(b)
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def read(self, n):
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if len(self.buf) < n:
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print("reader err: buf less than n")
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# TODO: exception
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return
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self.readCount += n
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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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201
example/python3/tmsp/server.py
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201
example/python3/tmsp/server.py
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import socket
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import select
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import sys
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import logging
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from .wire import decode_varint, encode
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from .reader import BytesBuffer
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from .msg import RequestDecoder, message_types
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# hold the asyncronous state of a connection
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# ie. we may not get enough bytes on one read to decode the message
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logger = logging.getLogger(__name__)
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class Connection():
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def __init__(self, fd, appCtx):
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self.fd = fd
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self.appCtx = appCtx
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self.recBuf = BytesBuffer(bytearray())
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self.resBuf = BytesBuffer(bytearray())
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self.msgLength = 0
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self.decoder = RequestDecoder(self.recBuf)
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self.inProgress = False # are we in the middle of a message
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def recv(this):
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data = this.fd.recv(1024)
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if not data: # what about len(data) == 0
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raise IOError("dead connection")
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this.recBuf.write(data)
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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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# map conn file descriptors to (appContext, reqBuf, resBuf, msgDecoder)
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self.appMap = {}
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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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new_fd.setblocking(0) # non-blocking
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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] = Connection(new_fd, appContext)
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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, recBuf, resBuf, conn
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conn = self.appMap[r]
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while True:
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try:
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print("recv loop")
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# check if we need more data first
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if conn.inProgress:
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if (conn.msgLength == 0 or conn.recBuf.size() < conn.msgLength):
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conn.recv()
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else:
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if conn.recBuf.size() == 0:
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conn.recv()
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conn.inProgress = True
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# see if we have enough to get the message length
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if conn.msgLength == 0:
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ll = conn.recBuf.peek()
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if conn.recBuf.size() < 1 + ll:
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# we don't have enough bytes to read the length yet
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return
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print("decoding msg length")
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conn.msgLength = decode_varint(conn.recBuf)
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# see if we have enough to decode the message
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if conn.recBuf.size() < conn.msgLength:
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return
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# now we can decode the message
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# first read the request type and get the particular msg
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# decoder
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typeByte = conn.recBuf.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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# messages are length prefixed
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conn.resBuf.write(encode(1))
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conn.resBuf.write([resTypeByte])
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conn.fd.send(conn.resBuf.buf)
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conn.msgLength = 0
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conn.inProgress = False
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conn.resBuf = BytesBuffer(bytearray())
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return
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decoder = getattr(conn.decoder, req_type)
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print("decoding args")
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req_args = decoder()
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print("got args", req_args)
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# done decoding message
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conn.msgLength = 0
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conn.inProgress = False
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req_f = getattr(conn.appCtx, req_type)
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if req_args is 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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print("called", req_type, "ret code:", ret_code, 'res:', res)
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if ret_code != 0:
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print("non-zero retcode:", ret_code)
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if req_type in ("echo", "info"): # these dont return a ret code
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enc = encode(res)
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# messages are length prefixed
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conn.resBuf.write(encode(len(enc) + 1))
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conn.resBuf.write([resTypeByte])
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conn.resBuf.write(enc)
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else:
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enc, encRet = encode(res), encode(ret_code)
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# messages are length prefixed
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conn.resBuf.write(encode(len(enc) + len(encRet) + 1))
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conn.resBuf.write([resTypeByte])
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conn.resBuf.write(encRet)
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conn.resBuf.write(enc)
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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 Exception as e:
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import sys
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print(sys.exc_info()[0])
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print("error reading from connection", str(e))
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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(
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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 Exception as e:
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print(e) # TODO: add logging
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self.shutdown = True
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119
example/python3/tmsp/wire.py
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119
example/python3/tmsp/wire.py
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@ -0,0 +1,119 @@
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# the decoder works off a reader
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# the encoder returns bytearray
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def hex2bytes(h):
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return bytearray(h.decode('hex'))
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def bytes2hex(b):
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if type(b) in (str, str):
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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 range(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:
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size = size - 0xF0
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i = decode_big_endian(reader, size)
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if negate:
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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, 'utf8')
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def decode_string(reader):
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length = decode_varint(reader)
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raw_data = reader.read(length)
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return raw_data.decode()
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def encode_list(s):
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b = bytearray()
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list(map(b.extend, list(map(encode, s))))
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return encode_varint(len(s)) + b
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def encode(s):
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print('encoding', repr(s))
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if s is 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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elif isinstance(s, bytearray):
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return encode_string(s)
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else:
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print("UNSUPPORTED TYPE!", type(s), s)
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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 = list(map(encode_big_endian, ns, ss))
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ds = list(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 = list(map(encode_string, ss))
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d = list(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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