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opusMT-router.py
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opusMT-router.py
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#!/usr/bin/env python3
#-*-python-*-
#
#
import signal
import sys
import ssl
import argparse
import codecs
import json
# import socket
from websocket import create_connection
from SimpleWebSocketServer import SimpleWebSocketServer, SimpleSSLWebSocketServer, WebSocket
## language identifer (if source language is not given)
import pycld2 as cld2
parser = argparse.ArgumentParser(description='Simple translation server.')
parser.add_argument('-p','--port', type=int, default=8080,
help='socket the server will listen on')
parser.add_argument('-c','--config', type=str, default="opusMT-servers.json",
help='MT server configurations')
parser.add_argument('-t','--deftrg','--default-target-language', type=str, default='en',
help='default target language')
parser.add_argument('-s','--defsrc','--default-source-language', type=str, default='fi',
help='default source language')
parser.add_argument('-m','--max-input-length', type=int, default=1000,
help='maximum length of the input string')
## SSL options
parser.add_argument("--ssl", default=0, type=int, action="store", dest="ssl",
help="ssl (1: on, 0: off (default))")
parser.add_argument("--cert", default='./cert.pem', type=str, action="store", dest="cert",
help="cert (./cert.pem)")
parser.add_argument("--key", default='./key.pem', type=str, action="store", dest="key",
help="key (./key.pem)")
parser.add_argument("--ver", default=ssl.PROTOCOL_TLSv1_2, type=int, action="store", dest="ver",
help="ssl version")
args = parser.parse_args()
with open(args.config, 'r') as f:
opusMT_servers = json.load(f)
## create a list of web socket connections
## (TODO: does that scale well?)
ws = dict()
opusMT = dict()
for h in opusMT_servers:
print("open connection to server " + h)
ws[h] = create_connection("ws:https://" + h)
srclangs = opusMT_servers[h]["source-languages"].split('+')
trglangs = opusMT_servers[h]["target-languages"].split('+')
model = 'default'
if 'model' in opusMT_servers[h]:
model = opusMT_servers[h]["model"]
for s in srclangs:
for t in trglangs:
key = s+'-'+t+'-'+model
if (not key in opusMT) or (len(srclangs) == 1 and len(trglangs) == 1):
print(" - serving " + s + t + '-' + model)
opusMT[key] = h
class Translate(WebSocket):
def handleMessage(self):
# print('received: ' + self.data)
fromLang = None
toLang = args.deftrg
prefix = ''
modelName = 'default'
try:
data = json.loads(self.data)
srctxt = data['text']
if 'model' in data:
modelName = data['model']
if 'source' in data:
if data['source'] != 'DL' and data['source'] != 'detect':
fromLang = data['source']
if 'target' in data:
if data['target']:
toLang = data['target']
except ValueError as error:
# print("invalid json: %s" % error)
srctxt = self.data
# check whether the first token specifies the language pair
srctxt = self.data
tokens = srctxt.split()
langs = tokens.pop(0).split('-')
if len(langs) == 2:
toLang = langs[1]
if langs[0] != 'DL' and langs[0] != 'detect':
fromLang = langs[0]
srctxt = " ".join(tokens)
srctxt = srctxt.strip().replace("\n",' ')
if not srctxt:
self.sendMessage(json.dumps({'result': ""}, sort_keys=True, indent=4))
return
if len(srctxt) > args.max_input_length:
self.sendMessage(json.dumps({'result': 'ERROR: Input too long! Maximum length = {}'.format(args.max_input_length)}, sort_keys=True, indent=4))
return
if not fromLang:
isReliable, textBytesFound, details = cld2.detect(srctxt, bestEffort=True)
fromLang = details[0][1]
print("language detected = " + fromLang)
# if fromLang == toLang and toLang != args.defsrc:
# toLang = args.defsrc
# special case: DL as target means to use the same as input
if toLang == 'DL' or toLang == 'detect':
toLang=fromLang
langpair = fromLang + '-' + toLang
model = langpair + '-' + modelName
if not model in opusMT:
print('unsupported language pair ' + langpair)
# self.sendMessage('ERROR: unsupported language pair ' + langpair)
self.sendMessage(json.dumps({'result': 'ERROR: unsupported language pair ' + langpair}, sort_keys=True, indent=4))
return
server = opusMT[model]
record = {'text': srctxt, 'source': fromLang, 'target': toLang}
message = json.dumps(record, sort_keys=True, indent=4)
# print("sending to " + server + ":" + message)
ws[server].send(message)
translated = ws[server].recv()
# ws[server].sendall(bytes(message, "utf-8"))
# translated = str(ws[server].recv(1024), "utf-8")
# print(translated, flush=True)
try:
result = json.loads(translated)
result['server'] = server
result['source'] = fromLang
result['target'] = toLang
self.sendMessage(json.dumps(result, sort_keys=True, indent=4))
except ValueError as error:
print("invalid json: %s" % error)
self.sendMessage(json.dumps({'result': 'ERROR: {}'.format(error)}, sort_keys=True, indent=4))
def handleConnected(self):
print(self.address, 'connected')
def handleClose(self):
print(self.address, 'closed')
if args.ssl == 1:
print("open ssl connection with version " + str(args.ver))
server = SimpleSSLWebSocketServer('', args.port, Translate,
args.cert, args.key, version=args.ver)
else:
server = SimpleWebSocketServer('', args.port, Translate)
server.serveforever()