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"""
Implementation of commands that run against the websocket interface of micropython
"""
from . import Constants
import websocket
import tty
import termios
from threading import Thread
from sys import stdout, stdin
from copy import copy
import os
import struct
def _connect_and_auth(url: str, password: str) -> websocket.WebSocket:
ws = websocket.create_connection(url, timeout=0.5)
frame = ws.recv_frame()
if password is None:
stdout.write('Password: ')
stdout.flush()
password = stdin.readline()
if frame.data != b"Password: ":
raise Exception("Unexpected response: {}".format(frame.data))
ws.send(password + "\n")
frame = ws.recv_frame()
if frame.data.strip() != b"WebREPL connected\r\n>>>":
raise Exception("Unexpected response: {}".format(frame.data))
return ws
def get(url: str, password: str, remote_filename: str, target: str):
if target:
if os.path.isdir(target):
local_filename = os.path.join(target, os.path.basename(remote_filename))
else:
local_filename = target
else:
local_filename = os.path.basename(remote_filename)
remote_filename_b = remote_filename.encode('utf-8')
ws = _connect_and_auth(url, password)
ws.settimeout(5)
rec = struct.pack(Constants.WEBREPL_REQ_S, b"WA",
Constants.WEBREPL_GET_FILE, 0, 0, 0,
len(remote_filename_b), remote_filename_b)
ws.send(rec, websocket.ABNF.OPCODE_BINARY)
frame = ws.recv_frame()
sig, code = struct.unpack("<2sH", frame.data)
if frame.opcode != websocket.ABNF.OPCODE_BINARY or sig != b'WB' or code != 0:
raise Exception("Error initial response sig={} code={}".format(sig, code))
ret = b""
while True:
# Confirm message
ws.send(b"\1", websocket.ABNF.OPCODE_BINARY)
frame = ws.recv_frame()
print(frame)
(sz,) = struct.unpack("<H", frame.data[:2])
if sz == 0:
break
ret += frame.data[2:]
frame = ws.recv_frame()
sig, code = struct.unpack("<2sH", frame.data)
if frame.opcode != websocket.ABNF.OPCODE_BINARY or sig != b'WB' or code != 0:
raise Exception("Error final response sig={} code={}".format(sig, code))
with open(local_filename, 'wb') as fh:
fh.write(ret)
def put(url: str, password: str, local_filename: str, target: str):
if target:
remote_filename = os.path.join(target, local_filename)
else:
remote_filename = os.path.basename(local_filename)
remote_filename_b = remote_filename.encode('utf-8')
with open(local_filename, 'br') as file_fh:
data = file_fh.read()
ws = _connect_and_auth(url, password)
ws.settimeout(5)
sz = len(data)
rec = struct.pack(Constants.WEBREPL_REQ_S, b"WA",
Constants.WEBREPL_PUT_FILE, 0, 0, sz,
len(remote_filename_b), remote_filename_b)
ws.send(rec[:10], websocket.ABNF.OPCODE_BINARY)
ws.send(rec[10:], websocket.ABNF.OPCODE_BINARY)
frame = ws.recv_frame()
sig, code = struct.unpack("<2sH", frame.data)
if frame.opcode != websocket.ABNF.OPCODE_BINARY or sig != b'WB' or code != 0:
raise Exception("Error initial response sig={} code={}".format(sig, code))
i = 0
n = int(sz / 256) + 1
print("{}..{}: ".format(i, n), end="")
cnt = 0
while True:
buf = data[cnt:cnt + 256]
if not buf:
break
ws.send(buf, websocket.ABNF.OPCODE_BINARY)
cnt += len(buf)
i += 1
print("{} ".format(i), end="")
print(". done")
frame = ws.recv_frame()
sig, code = struct.unpack("<2sH", frame.data)
if frame.opcode != websocket.ABNF.OPCODE_BINARY or sig != b'WB' or code != 0:
raise Exception("Error initial response sig={} code={}".format(sig, code))
def eval(url: str, password: str, code: str):
ws = _connect_and_auth(url, password)
ws.send(Constants.ENTER_REPL_MODE)
stdout.write(read_until_eval_or_timeout(ws))
ws.settimeout(5)
ws.send(code + "\r\n")
result = read_until_eval_or_timeout(ws)
stdout.write(result[:-6])
print("")
ws.close()
def read_until_eval_or_timeout(ws: websocket.WebSocket):
buf = ""
try:
while not buf.endswith("\r\n>>> "):
buf += ws.recv()
except websocket.WebSocketTimeoutException:
pass
return buf
class Reader(Thread):
def __init__(self, ws):
Thread.__init__(self)
self.ws = ws
self.stop = False
def run(self):
while True:
try:
frame = self.ws.recv_frame()
stdout.write(frame.data.decode('utf-8'))
stdout.flush()
except Exception as e:
if self.stop:
break
def set_tty_raw_mode(fd):
saved_mode = termios.tcgetattr(fd)
new_mode = copy(saved_mode)
new_mode[tty.LFLAG] = new_mode[tty.LFLAG] & ~termios.ECHO
new_mode[tty.CC][tty.VMIN] = 1
new_mode[tty.CC][tty.VTIME] = 0
set_tty_mode(fd, new_mode)
return saved_mode
def set_tty_mode(fd, mode):
termios.tcsetattr(fd, termios.TCSAFLUSH, mode)
def repl(url: str, password: str = None):
print("Type ^[ CTRL-] or CTRL-D to quit")
ws = _connect_and_auth(url, password)
ws.send("\x02")
reader = Reader(ws)
reader.start()
saved_tty_mode = set_tty_raw_mode(stdin.fileno())
try:
tty.setraw(stdin.fileno())
while True:
try:
in_char = stdin.read(1)
if in_char == "\x1d" or in_char == "\x04": # escape char 'Ctrl-]' or CTRL-C
break
else:
ws.send(in_char)
except KeyboardInterrupt:
break
except Exception as _:
pass
reader.stop = True
ws.close()
set_tty_mode(stdin.fileno(), saved_tty_mode)
print("")
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