I want to stream mp3 file from web using python PyQt5.I have researched a lot and only found code for streaming wav file.
from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtMultimedia import *
import urllib.request
import threading
import time
class Streamer:
def __init__(self,url):
self.url = url
self.fancy = urllib.request.URLopener()
self.web = self.fancy.open(self.url)
self.content_len = int(self.web.headers["Content-Length"])
self.data = self.web.read(1024*1024)
self.buffer = QBuffer()
self.buffer.writeData(self.data[250:])
self.buffer.open(QBuffer.ReadWrite)
threading.Thread(target=self.stream).start()
self.format = QAudioFormat()
self.format.setSampleRate(48000)
self.format.setChannelCount(2)
self.format.setSampleSize(16)
self.format.setCodec("audio/pcm")
self.format.setByteOrder(QAudioFormat.LittleEndian)
self.format.setSampleType(QAudioFormat.SignedInt)
self.audio = QAudioOutput(self.format)
self.audio.start(self.buffer)
def stream(self):
# while True:
# self.sound_data = self.web.read(1024*1024)
# if not self.sound_data:
# break
# self.buffer.buffer().append(self.sound_data)
# time.sleep(2)
while len(self.data) < self.content_len:
self.sound_data = self.web.read(1024*1024)
self.buffer.buffer().append(self.sound_data)
self.data+=self.sound_data
time.sleep(2)
self.buffer.buffer().clear()
del self.data
if __name__ == "__main__":
app = QApplication([])
streamer = Streamer("https://raw.githubusercontent.com/PremKumarMishra/Stream-Songs/main/Audio.wav")
app.exec_()
I checked but cant add MPEG-3(mp3 codec) codec in QAudioFormat.So this current code does not work for mp3.
The basic behavior of QMediaPlayer should be enough to manage buffering of simple audio streams, as the backend will consider the 100% of buffer size as enough to guarantee playing.
In case you want more control over the buffer state, you need to implement a custom QIODevice subclass to act as a middle layer between QMediaPlayer and the download process.
In the following example I'm using QNetworkAccessManager to download the stream, the readyRead signal of the QNetworkReply is then connected to a function that reads the raw bytes, and emits a buffer status considering the current available read data and the minimum size set for the buffer.
The first time the received data has reached the minimum size, it begins to emit the readyRead signal, and if the player has not been started yet (no media set), it sets the media using the Buffer instance, and is then ready to play.
from PyQt5 import QtCore, QtWidgets, QtNetwork, QtMultimedia
url = 'https://url.to/stream'
Errors = {}
for k, v in QtMultimedia.QMediaPlayer.__dict__.items():
if isinstance(v, QtMultimedia.QMediaPlayer.Error):
Errors[v] = k
class Buffer(QtCore.QIODevice):
buffering = QtCore.pyqtSignal(object, object)
fullBufferEmitted = False
def __init__(self, reply, minBufferSize=250000):
super().__init__()
self.minBufferSize = max(200000, minBufferSize)
self.reply = reply
self.data = bytes()
# the network reply is on another thread, use a mutex to ensure that
# no simultaneous access is done in the meantime
self.mutex = QtCore.QMutex()
# this is important!
self.setOpenMode(self.ReadOnly|self.Unbuffered)
self.reply.readyRead.connect(self.dataReceived)
def dataReceived(self):
self.mutex.lock()
self.data += self.reply.readAll().data()
dataLen = len(self.data)
self.mutex.unlock()
self.buffering.emit(dataLen, self.minBufferSize)
if not self.fullBufferEmitted:
if dataLen < self.minBufferSize:
return
self.fullBufferEmitted = True
self.readyRead.emit()
def isSequential(self):
return True
def readData(self, size):
self.mutex.lock()
data = self.data[:size]
self.data = self.data[size:]
self.mutex.unlock()
return data
def bytesAvailable(self):
return len(self.data) + super().bytesAvailable()
class Player(QtWidgets.QWidget):
def __init__(self):
super().__init__()
layout = QtWidgets.QVBoxLayout(self)
self.playButton = QtWidgets.QPushButton('Play', enabled=False)
layout.addWidget(self.playButton)
self.volumeSlider = QtWidgets.QSlider(QtCore.Qt.Horizontal)
layout.addWidget(self.volumeSlider)
self.statusLabel = QtWidgets.QLabel('Waiting')
self.statusLabel.setFrameShape(
self.statusLabel.StyledPanel|self.statusLabel.Sunken)
layout.addWidget(self.statusLabel)
self.player = QtMultimedia.QMediaPlayer(volume=16)
self.volumeSlider.setValue(self.player.volume())
self.networkManager = QtNetwork.QNetworkAccessManager()
self.url = QtCore.QUrl(url)
self.media = QtMultimedia.QMediaContent(self.url)
reply = self.networkManager.get(QtNetwork.QNetworkRequest(self.url))
self.buffer = Buffer(reply)
self.playButton.clicked.connect(self.play)
self.volumeSlider.valueChanged.connect(self.player.setVolume)
self.player.error.connect(self.error)
self.buffer.buffering.connect(self.buffering)
def error(self, error):
errorStr = 'Error: {} ({})'.format(
Errors.get(error, 'Unknown error'), int(error))
self.statusLabel.setText(errorStr)
print(errorStr)
def buffering(self, loaded, minBufferSize):
self.statusLabel.setText('Buffer: {}%'.format(int(loaded / minBufferSize * 100)))
if self.player.media().isNull() and loaded >= minBufferSize:
self.player.setMedia(self.media, self.buffer)
self.playButton.setEnabled(True)
self.playButton.setFocus()
self.statusLabel.setText('Ready to play')
def play(self):
if self.player.state() == self.player.PlayingState:
self.player.pause()
self.playButton.setText('Play')
else:
self.player.play()
self.playButton.setText('Pause')
app = QtWidgets.QApplication([])
w = Player()
w.show()
app.exec_()
Note that:
as soon as QMediaPlayer begins to read the stream, the buffer length will obviously become smaller, as there's no way to know or control how the backend access the stream: when the player is reading (which doesn't mean it's playing), it will read the stream anyway;
due to the reason above, the shown buffer size is only "guessed" as soon as the media is set, based on the data read and the data received from the network reply;
you might want to control the media player status in case the buffer goes too low (but you must consider what explained above), and eventually pause it;
Related
I have made a Desktop Application using Python and used PyQt5 and Pytube which could download video from youtube. When download is in Progress, I want to show user an animation. In Fact I did it, but when the file is getting downloaded the PyQt window seems like freezing and everything just gets paused until the download is complete. So, Does anyone know why is this happening? How do I fix it?
Here's the code snippet:
def download_created(self, qual): # Used in 'selection' method
selected_stream = yt.streams.get_by_resolution(qual)
self.progress_func()
try:
self.download_btn.setCurrentIndex(-1)
selected_stream.download(self.askLocation() + "/")
except:
pass
# This gets the quality that the user chooses
def selection(self):
global quality
quality = self.download_btn.currentText()
try:
self.download_created(quality) # Calls a method called 'download'
except:
self.start_anime()
# Fetching the details about the Link from Youtube
def download_youtube(self):
global check
if check != self.get_input():
check = self.get_input()
self.download_btn.clear()
enter_url = self.get_input()
try:
global yt
yt = pytube.YouTube(
enter_url,
on_progress_callback = on_progress,
on_complete_callback = self.complete_func)
self.start_anime()
except:
self.input_error()
VIDEO_TITLE = (yt.title)
global VIDEO_ID
VIDEO_ID = (yt.video_id)
videos = yt.streams.filter(mime_type="video/mp4", progressive="True")
# Display all the available qualities
for i in videos:
self.download_btn.addItem(i.resolution)
self.download_btn.currentIndexChanged.connect(self.selection)
You have to execute the time consuming tasks in another thread, for example in your case the task of getting the streams and downloading.
import sys
import threading
from functools import cached_property
from PyQt5 import QtCore, QtWidgets
import pytube
class QPyTube(QtCore.QObject):
initialized = QtCore.pyqtSignal(bool, str)
download_started = QtCore.pyqtSignal()
download_progress_changed = QtCore.pyqtSignal(int)
download_finished = QtCore.pyqtSignal()
def __init__(self, url):
super().__init__()
self._url = url
self._yt = None
self._mutex = threading.Lock()
threading.Thread(target=self._init, daemon=True).start()
#property
def url(self):
return self._url
#cached_property
def resolutions(self):
return list()
def _init(self):
with self._mutex:
self.resolutions.clear()
try:
self._yt = pytube.YouTube(
self.url,
on_progress_callback=self._on_progress,
on_complete_callback=self._on_complete,
)
streams = self._yt.streams.filter(mime_type="video/mp4", progressive="True")
except Exception as e:
self.initialized.emit(False, str(e))
return
with self._mutex:
self.resolutions = [stream.resolution for stream in streams]
self.initialized.emit(True, "")
def download(self, resolution, directory):
threading.Thread(
target=self._download, args=(resolution, directory), daemon=True
).start()
def _download(self, resolution, directory):
stream = self._yt.streams.get_by_resolution(resolution)
self.download_started.emit()
stream.download(directory)
def _on_progress(self, stream, chunk, bytes_remaining):
self.download_progress_changed.emit(
100 * (stream.filesize - bytes_remaining) // stream.filesize
)
def _on_complete(self, stream, filepath):
self.download_finished.emit()
class MainWindow(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super().__init__(parent)
self.le_url = QtWidgets.QLineEdit("http://youtube.com/watch?v=2lAe1cqCOXo")
self.lbl_error = QtWidgets.QLabel()
self.btn_search = QtWidgets.QPushButton("Search")
self.cmb_resolutions = QtWidgets.QComboBox()
self.le_directory = QtWidgets.QLineEdit("")
self.btn_download = QtWidgets.QPushButton("Download")
self.pgb_download = QtWidgets.QProgressBar()
central_widget = QtWidgets.QWidget()
self.setCentralWidget(central_widget)
lay = QtWidgets.QGridLayout(central_widget)
lay.addWidget(self.le_url, 0, 0)
lay.addWidget(self.btn_search, 0, 1)
lay.addWidget(self.cmb_resolutions, 1, 0)
lay.addWidget(self.le_directory, 1, 1)
lay.addWidget(self.btn_download, 1, 2)
lay.addWidget(self.pgb_download, 2, 0, 1, 3)
self.btn_download.setEnabled(False)
self._qpytube = None
self.btn_search.clicked.connect(self.handle_search_clicked)
self.btn_download.clicked.connect(self.handle_download_clicked)
def handle_search_clicked(self):
self.cmb_resolutions.clear()
self.btn_search.setEnabled(False)
self.btn_download.setEnabled(False)
self.lbl_error.clear()
self._qpytube = QPyTube(self.le_url.text())
self._qpytube.initialized.connect(self.handle_initialized)
self._qpytube.download_progress_changed.connect(self.pgb_download.setValue)
self._qpytube.download_started.connect(self.handle_download_started)
self._qpytube.download_finished.connect(self.handle_download_finished)
#QtCore.pyqtSlot(bool, str)
def handle_initialized(self, status, error=""):
if status:
self.cmb_resolutions.addItems(self._qpytube.resolutions)
self.btn_download.setEnabled(True)
else:
self.lbl_error.setText(error)
self.btn_search.setEnabled(True)
def handle_download_clicked(self):
self._qpytube.download(
self.cmb_resolutions.currentText(), self.le_directory.text()
)
self.btn_search.setEnabled(False)
self.btn_download.setEnabled(False)
self.le_directory.setEnabled(False)
def handle_download_started(self):
self.lbl_error.clear()
print("started")
def handle_download_finished(self):
self.pgb_download.setValue(100)
self.btn_search.setEnabled(True)
self.btn_download.setEnabled(True)
self.le_directory.setEnabled(True)
print("finished")
def main(args):
app = QtWidgets.QApplication(args)
w = MainWindow()
w.show()
app.exec_()
if __name__ == "__main__":
main(sys.argv)
I have made a Desktop Application using Python and used PyQt5 and Pytube which could download video from youtube. When download is in Progress, I want to show user an animation. In Fact I did it, but when the file is getting downloaded the PyQt window seems like freezing and everything just gets paused until the download is complete. So, Does anyone know why is this happening? How do I fix it?
Here's the code snippet:
def download_created(self, qual): # Used in 'selection' method
selected_stream = yt.streams.get_by_resolution(qual)
self.progress_func()
try:
self.download_btn.setCurrentIndex(-1)
selected_stream.download(self.askLocation() + "/")
except:
pass
# This gets the quality that the user chooses
def selection(self):
global quality
quality = self.download_btn.currentText()
try:
self.download_created(quality) # Calls a method called 'download'
except:
self.start_anime()
# Fetching the details about the Link from Youtube
def download_youtube(self):
global check
if check != self.get_input():
check = self.get_input()
self.download_btn.clear()
enter_url = self.get_input()
try:
global yt
yt = pytube.YouTube(
enter_url,
on_progress_callback = on_progress,
on_complete_callback = self.complete_func)
self.start_anime()
except:
self.input_error()
VIDEO_TITLE = (yt.title)
global VIDEO_ID
VIDEO_ID = (yt.video_id)
videos = yt.streams.filter(mime_type="video/mp4", progressive="True")
# Display all the available qualities
for i in videos:
self.download_btn.addItem(i.resolution)
self.download_btn.currentIndexChanged.connect(self.selection)
You have to execute the time consuming tasks in another thread, for example in your case the task of getting the streams and downloading.
import sys
import threading
from functools import cached_property
from PyQt5 import QtCore, QtWidgets
import pytube
class QPyTube(QtCore.QObject):
initialized = QtCore.pyqtSignal(bool, str)
download_started = QtCore.pyqtSignal()
download_progress_changed = QtCore.pyqtSignal(int)
download_finished = QtCore.pyqtSignal()
def __init__(self, url):
super().__init__()
self._url = url
self._yt = None
self._mutex = threading.Lock()
threading.Thread(target=self._init, daemon=True).start()
#property
def url(self):
return self._url
#cached_property
def resolutions(self):
return list()
def _init(self):
with self._mutex:
self.resolutions.clear()
try:
self._yt = pytube.YouTube(
self.url,
on_progress_callback=self._on_progress,
on_complete_callback=self._on_complete,
)
streams = self._yt.streams.filter(mime_type="video/mp4", progressive="True")
except Exception as e:
self.initialized.emit(False, str(e))
return
with self._mutex:
self.resolutions = [stream.resolution for stream in streams]
self.initialized.emit(True, "")
def download(self, resolution, directory):
threading.Thread(
target=self._download, args=(resolution, directory), daemon=True
).start()
def _download(self, resolution, directory):
stream = self._yt.streams.get_by_resolution(resolution)
self.download_started.emit()
stream.download(directory)
def _on_progress(self, stream, chunk, bytes_remaining):
self.download_progress_changed.emit(
100 * (stream.filesize - bytes_remaining) // stream.filesize
)
def _on_complete(self, stream, filepath):
self.download_finished.emit()
class MainWindow(QtWidgets.QMainWindow):
def __init__(self, parent=None):
super().__init__(parent)
self.le_url = QtWidgets.QLineEdit("http://youtube.com/watch?v=2lAe1cqCOXo")
self.lbl_error = QtWidgets.QLabel()
self.btn_search = QtWidgets.QPushButton("Search")
self.cmb_resolutions = QtWidgets.QComboBox()
self.le_directory = QtWidgets.QLineEdit("")
self.btn_download = QtWidgets.QPushButton("Download")
self.pgb_download = QtWidgets.QProgressBar()
central_widget = QtWidgets.QWidget()
self.setCentralWidget(central_widget)
lay = QtWidgets.QGridLayout(central_widget)
lay.addWidget(self.le_url, 0, 0)
lay.addWidget(self.btn_search, 0, 1)
lay.addWidget(self.cmb_resolutions, 1, 0)
lay.addWidget(self.le_directory, 1, 1)
lay.addWidget(self.btn_download, 1, 2)
lay.addWidget(self.pgb_download, 2, 0, 1, 3)
self.btn_download.setEnabled(False)
self._qpytube = None
self.btn_search.clicked.connect(self.handle_search_clicked)
self.btn_download.clicked.connect(self.handle_download_clicked)
def handle_search_clicked(self):
self.cmb_resolutions.clear()
self.btn_search.setEnabled(False)
self.btn_download.setEnabled(False)
self.lbl_error.clear()
self._qpytube = QPyTube(self.le_url.text())
self._qpytube.initialized.connect(self.handle_initialized)
self._qpytube.download_progress_changed.connect(self.pgb_download.setValue)
self._qpytube.download_started.connect(self.handle_download_started)
self._qpytube.download_finished.connect(self.handle_download_finished)
#QtCore.pyqtSlot(bool, str)
def handle_initialized(self, status, error=""):
if status:
self.cmb_resolutions.addItems(self._qpytube.resolutions)
self.btn_download.setEnabled(True)
else:
self.lbl_error.setText(error)
self.btn_search.setEnabled(True)
def handle_download_clicked(self):
self._qpytube.download(
self.cmb_resolutions.currentText(), self.le_directory.text()
)
self.btn_search.setEnabled(False)
self.btn_download.setEnabled(False)
self.le_directory.setEnabled(False)
def handle_download_started(self):
self.lbl_error.clear()
print("started")
def handle_download_finished(self):
self.pgb_download.setValue(100)
self.btn_search.setEnabled(True)
self.btn_download.setEnabled(True)
self.le_directory.setEnabled(True)
print("finished")
def main(args):
app = QtWidgets.QApplication(args)
w = MainWindow()
w.show()
app.exec_()
if __name__ == "__main__":
main(sys.argv)
I am new to Google API and web services. I only tried GoogleTransateAPI once but that one works fine. Now, I want to use Google Media Translation API to translate voice input. I followed the tutorial from https://cloud.google.com/translate/media/docs/streaming.
However, I cannot make it work. There is no error at the run time so I don't know where to look at. Could you please help me identify the problem?
# [START media_translation_translate_from_mic]
from __future__ import division
import itertools
from google.cloud import mediatranslation as media
import pyaudio
from six.moves import queue
import os
os.environ["GOOGLE_APPLICATION_CREDENTIALS"]="/Users/Me/GoogleMT/TranslationAPI/MediaKey.json"
# Audio recording parametersss
RATE = 16000
CHUNK = int(RATE / 10) # 100ms
SpeechEventType = media.StreamingTranslateSpeechResponse.SpeechEventType
class MicrophoneStream:
"""Opens a recording stream as a generator yielding the audio chunks."""
def __init__(self, rate, chunk):
self._rate = rate
self._chunk = chunk
# Create a thread-safe buffer of audio data
self._buff = queue.Queue()
self.closed = True
def __enter__(self):
self._audio_interface = pyaudio.PyAudio()
self._audio_stream = self._audio_interface.open(
format=pyaudio.paInt16,
channels=1, rate=self._rate,
input=True, frames_per_buffer=self._chunk,
# Run the audio stream asynchronously to fill the buffer object.
# This is necessary so that the input device's buffer doesn't
# overflow while the calling thread makes network requests, etc.
stream_callback=self._fill_buffer,
)
self.closed = False
return self
def __exit__(self, type=None, value=None, traceback=None):
self._audio_stream.stop_stream()
self._audio_stream.close()
self.closed = True
# Signal the generator to terminate so that the client's
# streaming_recognize method will not block the process termination.
self._buff.put(None)
self._audio_interface.terminate()
def _fill_buffer(self, in_data, frame_count, time_info, status_flags):
"""Continuously collect data from the audio stream, into the buffer."""
self._buff.put(in_data)
return None, pyaudio.paContinue
def exit(self):
self.__exit__()
def generator(self):
while not self.closed:
# Use a blocking get() to ensure there's at least one chunk of
# data, and stop iteration if the chunk is None, indicating the
# end of the audio stream.
chunk = self._buff.get()
if chunk is None:
return
data = [chunk]
# Now consume whatever other data's still buffered.
while True:
try:
chunk = self._buff.get(block=False)
if chunk is None:
return
data.append(chunk)
except queue.Empty:
break
yield b''.join(data)
def listen_print_loop(responses):
"""Iterates through server responses and prints them.
The responses passed is a generator that will block until a response
is provided by the server.
"""
translation = ''
source = ''
for response in responses:
# Once the transcription settles, the response contains the
# END_OF_SINGLE_UTTERANCE event.
if (response.speech_event_type ==
SpeechEventType.END_OF_SINGLE_UTTERANCE):
print(u'\nFinal translation: {0}'.format(translation))
print(u'Final recognition result: {0}'.format(source))
return 0
result = response.result
translation = result.text_translation_result.translation
source = result.recognition_result
print(u'\nPartial translation: {0}'.format(translation))
print(u'Partial recognition result: {0}'.format(source))
def do_translation_loop():
print('Begin speaking...')
client = media.SpeechTranslationServiceClient()
speech_config = media.TranslateSpeechConfig(
audio_encoding='linear16',
source_language_code='en-US',
target_language_code='ja')
config = media.StreamingTranslateSpeechConfig(
audio_config=speech_config, single_utterance=True)
# The first request contains the configuration.
# Note that audio_content is explicitly set to None.
first_request = media.StreamingTranslateSpeechRequest(
streaming_config=config, audio_content=None)
with MicrophoneStream(RATE, CHUNK) as stream:
audio_generator = stream.generator()
mic_requests = (media.StreamingTranslateSpeechRequest(
audio_content=content,
streaming_config=config)
for content in audio_generator)
requests = itertools.chain(iter([first_request]), mic_requests)
responses = client.streaming_translate_speech(requests)
# Print the translation responses as they arrive
result = listen_print_loop(responses)
if result == 0:
stream.exit()
def main():
while True:
print()
option = input('Press any key to translate or \'q\' to quit: ')
if option.lower() == 'q':
break
do_translation_loop()
if __name__ == '__main__':
main()
# [END media_translation_translate_from_mic]
The result is like this. No translation nor recognition result.
Result screenshot
I was not sure if the problem is with my mic so I tried a similar example code from another Google tutorial to translate an audio file. The result is the same, no recognition result nor translation.
Did I miss something?
Thank you very much.
I'm trying to write a small python app, using PySide for the GUI and Twython as a Twitter API library, to catch a stream from Twitter.
The problem that I am having is that when I click "Start Monitoring Twitter" button, the UI freezes until the stream is complete, at which point the code continues to execute and disables the Start button and enables the Stop button. Here's the UI:
Everything else seems to work -- if I leave it, then the CSV file is created as I suspect -- the Twython components seem to be working as expected.
Line 151 is where the streaming from Twitter is engaged when I click start:
self.stream.statuses.filter(track=self.search_term)
How can I move the streaming to a separate thread and then use the Stop button on the UI to tell Twython to complete capturing the stream and exit?
I need to be able to send the MyStreamer instance to another thread and then send it the .disconnect() signal to have it terminate capturing the stream.
Here's the full code:
#!/usr/bin/env python
# -*- coding: utf-8 -*-
import sys
import platform
import PySide
from PySide.QtGui import QApplication, QMainWindow, QPushButton, QCheckBox, QTextEdit
from time import sleep
from ui_tweetstream import Ui_MainWindow
from twython import Twython
from twython import TwythonStreamer
import csv
class MainWindow(QMainWindow, Ui_MainWindow):
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
self.setupUi(self)
# Set up Variables
self.tweet_fav_count = True
self.tweet_geocoordinates = True
self.tweet_id = True
self.tweet_language = True
self.tweet_orig_tweet_id = True
self.tweet_orig_username = True
self.tweet_retweeted = True
self.tweet_sensitive = True
self.tweet_source_app = True
self.tweet_timestamp = True
self.tweet_user_name = True
self.search_term = "#bigdata"
self.tweets_to_get = 1000
# Bind the interface
self.check_tweet_fav_count.clicked.connect(self.setTweetFavCount)
self.check_tweet_geocoordinates.clicked.connect(self.setTweetGeocoordinates)
self.check_tweet_id.clicked.connect(self.setTweetID)
self.check_tweet_language.clicked.connect(self.setTweetLanguage)
self.check_tweet_orig_tweet_id.clicked.connect(self.setTweetOrigTweetID)
self.check_tweet_orig_username.clicked.connect(self.setTweetOrigUsername)
self.check_tweet_retweeted.clicked.connect(self.setTweetRetweeted)
self.check_tweet_sensitive.clicked.connect(self.setTweetSensitive)
self.check_tweet_source_app.clicked.connect(self.setTweetSourceApp)
self.check_tweet_timestamp.clicked.connect(self.setTweetTimestamp)
self.check_tweet_user_name.clicked.connect(self.setTweetUsername)
self.button_start.clicked.connect(self.streamStart)
self.button_stop.clicked.connect(self.streamStop)
# Set the initial states
self.button_stop.setEnabled(False)
APP_KEY = ''
APP_SECRET = ''
OAUTH_TOKEN = ''
OAUTH_TOKEN_SECRET = ''
self.t = Twython(APP_KEY, APP_SECRET, OAUTH_TOKEN, OAUTH_TOKEN_SECRET)
self.stream = MyStreamer(APP_KEY,APP_SECRET,OAUTH_TOKEN,OAUTH_TOKEN_SECRET)
self.stream.init_mainWindow(self)
def streamStop(self):
print "Stopping stream"
# Enable other controls here
self.button_stop.setEnabled(False)
self.button_start.setEnabled(True)
self.setControlStates(True)
self.stream.stopStream()
def setControlStates(self, state):
self.check_tweet_fav_count.setEnabled(state)
self.check_tweet_geocoordinates.setEnabled(state)
self.check_tweet_id.setEnabled(state)
self.check_tweet_language.setEnabled(state)
self.check_tweet_orig_tweet_id.setEnabled(state)
self.check_tweet_orig_username.setEnabled(state)
self.check_tweet_retweeted.setEnabled(state)
self.check_tweet_sensitive.setEnabled(state)
self.check_tweet_source_app.setEnabled(state)
self.check_tweet_timestamp.setEnabled(state)
self.check_tweet_user_name.setEnabled(state)
self.search_box.setEnabled(state)
self.num_tweets_box.setEnabled(state)
# Functions for determining what to track
def setTweetFavCount(self):
self.tweet_fav_count = not self.tweet_fav_count
print "tweet_fav_count:", self.tweet_fav_count
def setTweetGeocoordinates(self):
self.tweet_geocoordinates = not self.tweet_geocoordinates
print "tweet_geocoordinates:", self.tweet_geocoordinates
def setTweetID(self):
self.tweet_id = not self.tweet_id
print "tweet_id:", self.tweet_id
def setTweetLanguage(self):
self.tweet_language = not self.tweet_language
print "tweet_language:", self.tweet_language
def setTweetOrigTweetID(self):
self.tweet_orig_tweet_id = not self.tweet_orig_tweet_id
print "tweet_orig_tweet_id:", self.tweet_orig_tweet_id
def setTweetOrigUsername(self):
self.tweet_orig_username = not self.tweet_orig_tweet_id
print "tweet_orig_username:", self. tweet_orig_username
def setTweetRetweeted(self):
self.tweet_retweeted = not self.tweet_retweeted
print "tweet_retweeted:", self.tweet_retweeted
def setTweetSensitive(self):
self.tweet_sensitive = not self.tweet_sensitive
print "tweet_sensitive:", self.tweet_sensitive
def setTweetSourceApp(self):
self.tweet_source_app = not self.tweet_source_app
print "tweet_source_app:", self.tweet_source_app
def setTweetTimestamp(self):
self.tweet_timestamp = not self.tweet_timestamp
print "tweet_timestamp:", self.tweet_timestamp
def setTweetUsername(self):
self.tweet_user_name = not self.tweet_user_name
print "tweet_user_name:", self.tweet_user_name
# Functions for starting and stopping the stream
def streamStart(self):
print "Starting stream"
self.setControlStates(False)
# Disable other controls here
self.button_start.setEnabled(False)
self.button_stop.setEnabled(True)
# Hack to try to disable the UI
# sleep(0.25)
# Get the active search term
self.search_term = self.search_box.text()
# Get the number of tweets
self.tweets_to_get = int(self.num_tweets_box.text())
# Set the streamer
self.stream.set_start_criteria(self.tweets_to_get)
self.stream.statuses.filter(track=self.search_term)
class MyStreamer(TwythonStreamer):
def init_mainWindow(self, the_main_window):
self.main_window = the_main_window
self.stop = False
self.header_done = False
def set_start_criteria(self, numTweets):
self.maxTweets = numTweets
self.tweetCount = 0
print "Number of tweets to get:", self.maxTweets
def stopStream(self):
self.stop = True
def on_success(self, data):
if 'text' in data:
self.tweetCount += 1
print "tweetCount:", self.tweetCount
#tweet = data['text'].encode('utf-8')
theTweet = data
writer = TweetMonkey()
writer.assignMainWindow(self.main_window, self.header_done)
self.header_done = True
writer.process(theTweet)
# Want to disconnect after the first result?
if self.stop is True or self.tweetCount >= self.maxTweets:
self.disconnect()
def on_error(self, status_code, data):
print status_code, data
class TweetMonkey:
def assignMainWindow(self,the_main_window, is_header_done):
self.main_window = the_main_window
self.header_done = is_header_done
def clean(self,text):
text = text.replace("\n","; ")
text = text.replace('"', "'")
text = text.replace(','," ")
return text
def create_header(self):
header = []
tweets = open("tweets.csv", 'ab+')
wr = csv.writer(tweets, dialect='excel')
if self.main_window.tweet_id is True:
header.append("id")
if self.main_window.tweet_language is True:
header.append("lang")
if self.main_window.tweet_user_name is True:
header.append("user_name")
header.append("tweet")
if self.main_window.tweet_retweeted is True:
header.append("retweeted")
if self.main_window.tweet_fav_count is True:
header.append("favorite_count")
if self.main_window.tweet_source_app is True:
header.append("source")
if self.main_window.tweet_orig_tweet_id is True:
header.append("in_reply_to_status_id")
if self.main_window.tweet_orig_username is True:
header.append("in_reply_to_screen_name")
# header.append("in_reply_to_user_id")
if self.main_window.tweet_sensitive is True:
header.append("possibly_sensitive")
if self.main_window.tweet_geocoordinates is True:
header.append("geo")
if self.main_window.tweet_timestamp is True:
header.append("created_at")
wr.writerow(header)
tweets.close()
def process(self, tweet):
if not self.header_done:
self.create_header()
self.header_done = True
# Create the file or append to the existing
theOutput = []
tweets = open("tweets.csv", 'ab+')
wr = csv.writer(tweets, dialect='excel')
if self.main_window.tweet_id is True:
theOutput.append(tweet['id'])
if self.main_window.tweet_language is True:
theOutput.append(tweet['lang'].encode('utf-8'))
if self.main_window.tweet_user_name is True:
theOutput.append(tweet['user']['name'].encode('utf-8', 'replace'))
theOutput.append(self.clean(tweet['text']).encode('utf-8', 'replace'))
if self.main_window.tweet_retweeted is True:
theOutput.append(tweet['retweeted'])
if self.main_window.tweet_fav_count is True:
theOutput.append(tweet['favorite_count'])
if self.main_window.tweet_source_app is True:
theOutput.append(self.clean(tweet['source']).encode('utf-8', 'replace'))
if self.main_window.tweet_orig_tweet_id is True:
theOutput.append(tweet['in_reply_to_status_id'])
if self.main_window.tweet_orig_username is True:
theOutput.append(tweet['in_reply_to_screen_name'])
#theOutput.append(tweet['in_reply_to_user_id'])
if self.main_window.tweet_sensitive is True:
if tweet.get('possibly_sensitive'):
theOutput.append(tweet['possibly_sensitive'])
else:
theOutput.append("False")
if self.main_window.tweet_geocoordinates is True:
if tweet['geo'] is not None:
if tweet['geo']['type'] == 'Point':
lat = str(tweet['geo']['coordinates'][0]) + " "
lon = str(tweet['geo']['coordinates'][1])
theOutput.append(lat + lon)
else:
theOutput.append(tweet['geo'])
else:
theOutput.append(tweet['geo'])
if self.main_window.tweet_timestamp is True:
theOutput.append(tweet['created_at'])
wr.writerow(theOutput)
tweets.close()
if __name__ == '__main__':
app = QApplication(sys.argv)
frame = MainWindow()
frame.show()
app.exec_()
I know this is an old post but I ran into a similar problem in a simple app I recently wrote, my solution was to use threading.
I used the worker from:
https://pymotw.com/2/threading/
and the method described in:
http://aadrake.com/using-twitter-as-a-stream-processing-source.html
Basically running the Twython stream as a separate thread feeding text to a queue then I run the rest of the program in a separate loop reading from the queue.
I am looking to create a QTcpServer using PyQt that can simultaneously return data to 2 or more clients. I assume that this will require threading.
Using the threadedfortuneserver.py example as a test case (included with PyQt4, on my system it is found in /usr/share/doc/python-qt4-doc/examples/network), I want to connect multiple clients and each time one of the clients asks for a fortune, the other clients also get updated with a message like "Client X just received the fortune 'blah blah blah'".
I understand how the fortuneserver/client program works, but it seems that the client connections are immediately terminated after the fortune is sent back to the client. My specific questions are:
Is it possible to keep all of the connections open so that every
time one of the clients requests a fortune, the other clients can be
updated?
If so, what is the best way to keep track of and loop over the connected clients?
This is a serious stumbling block for me because I want to develop an app where several clients can interact, and each client can be updated about the actions of the other clients.
Thanks in advance for your help, let me know if there is any other information I can provide.
I found this thread but there wasn't enough specific information to make use of. Other discussions have been for the Python socket package, but it is my understanding that when using PyQt, the server should be a QTcpServer so everything plays nice.
*** EDIT ***
Here are the beginning stages of my solution. I have created a basic server and client. The server just sends back what the client entered into a Line Edit box.
I am basing this on the "buildingservices" example from Chapter 18 of Rapid GUI Programming with Python and Qt.
The major change I made is that now the threads keep running indefinitely and their sockets stay open, listening for data being sent by the client.
It handles multiple clients fine. It is certainly ugly, but I think it is a good starting point.
What I would like is to be able to notify each client whenever one client enters text (like a typical chat program, say).
Also, to give you an idea of who you are dealing with, I am NOT a professional programmer. I am a physicist with many years of undisciplined scripting and fiddling around under my belt. But I would like to try to develop basic server/client programs that can pass data around.
Thanks for any help or suggestions!
SERVER:
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtNetwork import *
PORT = 9999
SIZEOF_UINT16 = 2
class Thread(QThread):
#lock = QReadWriteLock()
def __init__(self, socketId, parent):
super(Thread, self).__init__(parent)
self.socketId = socketId
def run(self):
self.socket = QTcpSocket()
if not self.socket.setSocketDescriptor(self.socketId):
self.emit(SIGNAL("error(int)"), socket.error())
return
while self.socket.state() == QAbstractSocket.ConnectedState:
nextBlockSize = 0
stream = QDataStream(self.socket)
stream.setVersion(QDataStream.Qt_4_2)
if (self.socket.waitForReadyRead(-1) and
self.socket.bytesAvailable() >= SIZEOF_UINT16):
nextBlockSize = stream.readUInt16()
else:
self.sendError("Cannot read client request")
return
if self.socket.bytesAvailable() < nextBlockSize:
if (not self.socket.waitForReadyRead(-1) or
self.socket.bytesAvailable() < nextBlockSize):
self.sendError("Cannot read client data")
return
textFromClient = stream.readQString()
textToClient = "You wrote: \"{}\"".format(textFromClient)
self.sendReply(textToClient)
def sendError(self, msg):
reply = QByteArray()
stream = QDataStream(reply, QIODevice.WriteOnly)
stream.setVersion(QDataStream.Qt_4_2)
stream.writeUInt16(0)
stream.writeQString("ERROR")
stream.writeQString(msg)
stream.device().seek(0)
stream.writeUInt16(reply.size() - SIZEOF_UINT16)
self.socket.write(reply)
def sendReply(self, text):
reply = QByteArray()
stream = QDataStream(reply, QIODevice.WriteOnly)
stream.setVersion(QDataStream.Qt_4_2)
stream.writeUInt16(0)
stream.writeQString(text)
stream.device().seek(0)
stream.writeUInt16(reply.size() - SIZEOF_UINT16)
self.socket.write(reply)
class TcpServer(QTcpServer):
def __init__(self, parent=None):
super(TcpServer, self).__init__(parent)
def incomingConnection(self, socketId):
self.thread = Thread(socketId, self)
self.thread.start()
class ServerDlg(QPushButton):
def __init__(self, parent=None):
super(ServerDlg, self).__init__(
"&Close Server", parent)
self.setWindowFlags(Qt.WindowStaysOnTopHint)
self.tcpServer = TcpServer(self)
if not self.tcpServer.listen(QHostAddress("0.0.0.0"), PORT):
QMessageBox.critical(self, "Threaded Server",
"Failed to start server: {}".format(
self.tcpServer.errorString()))
self.close()
return
self.connect(self, SIGNAL("clicked()"), self.close)
font = self.font()
font.setPointSize(24)
self.setFont(font)
self.setWindowTitle("Threaded Server")
app = QApplication(sys.argv)
form = ServerDlg()
form.show()
form.move(0, 0)
app.exec_()
CLIENT:
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtNetwork import *
PORT = 9999
SIZEOF_UINT16 = 2
class Form(QDialog):
def __init__(self, parent=None):
super(Form, self).__init__(parent)
# Ititialize socket
self.socket = QTcpSocket()
# Initialize data IO variables
self.nextBlockSize = 0
self.request = None
# Create widgets/layout
self.browser = QTextBrowser()
self.lineedit = QLineEdit("Texty bits")
self.lineedit.selectAll()
self.connectButton = QPushButton("Connect")
self.connectButton.setDefault(False)
self.connectButton.setEnabled(True)
layout = QVBoxLayout()
layout.addWidget(self.browser)
layout.addWidget(self.lineedit)
layout.addWidget(self.connectButton)
self.setLayout(layout)
self.lineedit.setFocus()
# Signals and slots for line edit and connect button
self.lineedit.returnPressed.connect(self.sendToServer)
self.connectButton.released.connect(self.connectToServer)
self.setWindowTitle("Client")
# Signals and slots for networking
self.socket.readyRead.connect(self.readFromServer)
self.socket.disconnected.connect(self.serverHasStopped)
self.connect(self.socket,
SIGNAL("error(QAbstractSocket::SocketError)"),
self.serverHasError)
# Update GUI
def updateUi(self, text):
self.browser.append(text)
# Create connection to server
def connectToServer(self):
self.connectButton.setEnabled(False)
print("Connecting to server")
self.socket.connectToHost("localhost", PORT)
# Send data to server
def sendToServer(self):
self.request = QByteArray()
stream = QDataStream(self.request, QIODevice.WriteOnly)
stream.setVersion(QDataStream.Qt_4_2)
stream.writeUInt16(0)
stream.writeQString(self.lineedit.text())
stream.device().seek(0)
stream.writeUInt16(self.request.size() - SIZEOF_UINT16)
self.socket.write(self.request)
self.nextBlockSize = 0
self.request = None
self.lineedit.setText("")
# Read data from server and update Text Browser
def readFromServer(self):
stream = QDataStream(self.socket)
stream.setVersion(QDataStream.Qt_4_2)
while True:
if self.nextBlockSize == 0:
if self.socket.bytesAvailable() < SIZEOF_UINT16:
break
self.nextBlockSize = stream.readUInt16()
if self.socket.bytesAvailable() < self.nextBlockSize:
break
textFromServer = stream.readQString()
self.updateUi(textFromServer)
self.nextBlockSize = 0
def serverHasStopped(self):
self.socket.close()
def serverHasError(self):
self.updateUi("Error: {}".format(
self.socket.errorString()))
self.socket.close()
app = QApplication(sys.argv)
form = Form()
form.show()
app.exec_()
As was probably exasperatingly obvious to most of you, I didn't fully understand how to deal with threads! Not to worry, I have discovered a way to design a server that can send data to multiple clients with nary a secondary thread to be found.
Quite simple, really, but I'm not the quickest of cats at the best of times.
SERVER:
#!/usr/bin/env python3
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtNetwork import *
PORT = 9999
SIZEOF_UINT32 = 4
class ServerDlg(QPushButton):
def __init__(self, parent=None):
super(ServerDlg, self).__init__(
"&Close Server", parent)
self.setWindowFlags(Qt.WindowStaysOnTopHint)
self.tcpServer = QTcpServer(self)
self.tcpServer.listen(QHostAddress("0.0.0.0"), PORT)
self.connect(self.tcpServer, SIGNAL("newConnection()"),
self.addConnection)
self.connections = []
self.connect(self, SIGNAL("clicked()"), self.close)
font = self.font()
font.setPointSize(24)
self.setFont(font)
self.setWindowTitle("Server")
def addConnection(self):
clientConnection = self.tcpServer.nextPendingConnection()
clientConnection.nextBlockSize = 0
self.connections.append(clientConnection)
self.connect(clientConnection, SIGNAL("readyRead()"),
self.receiveMessage)
self.connect(clientConnection, SIGNAL("disconnected()"),
self.removeConnection)
self.connect(clientConnection, SIGNAL("error()"),
self.socketError)
def receiveMessage(self):
for s in self.connections:
if s.bytesAvailable() > 0:
stream = QDataStream(s)
stream.setVersion(QDataStream.Qt_4_2)
if s.nextBlockSize == 0:
if s.bytesAvailable() < SIZEOF_UINT32:
return
s.nextBlockSize = stream.readUInt32()
if s.bytesAvailable() < s.nextBlockSize:
return
textFromClient = stream.readQString()
s.nextBlockSize = 0
self.sendMessage(textFromClient,
s.socketDescriptor())
s.nextBlockSize = 0
def sendMessage(self, text, socketId):
for s in self.connections:
if s.socketDescriptor() == socketId:
message = "You> {}".format(text)
else:
message = "{}> {}".format(socketId, text)
reply = QByteArray()
stream = QDataStream(reply, QIODevice.WriteOnly)
stream.setVersion(QDataStream.Qt_4_2)
stream.writeUInt32(0)
stream.writeQString(message)
stream.device().seek(0)
stream.writeUInt32(reply.size() - SIZEOF_UINT32)
s.write(reply)
def removeConnection(self):
pass
def socketError(self):
pass
app = QApplication(sys.argv)
form = ServerDlg()
form.show()
form.move(0, 0)
app.exec_()
CLIENT
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtNetwork import *
PORTS = (9998, 9999)
PORT = 9999
SIZEOF_UINT32 = 4
class Form(QDialog):
def __init__(self, parent=None):
super(Form, self).__init__(parent)
# Ititialize socket
self.socket = QTcpSocket()
# Initialize data IO variables
self.nextBlockSize = 0
self.request = None
# Create widgets/layout
self.browser = QTextBrowser()
self.lineedit = QLineEdit("Enter text here, dummy")
self.lineedit.selectAll()
self.connectButton = QPushButton("Connect")
self.connectButton.setEnabled(True)
layout = QVBoxLayout()
layout.addWidget(self.browser)
layout.addWidget(self.lineedit)
layout.addWidget(self.connectButton)
self.setLayout(layout)
self.lineedit.setFocus()
# Signals and slots for line edit and connect button
self.lineedit.returnPressed.connect(self.issueRequest)
self.connectButton.clicked.connect(self.connectToServer)
self.setWindowTitle("Client")
# Signals and slots for networking
self.socket.readyRead.connect(self.readFromServer)
self.socket.disconnected.connect(self.serverHasStopped)
self.connect(self.socket,
SIGNAL("error(QAbstractSocket::SocketError)"),
self.serverHasError)
# Update GUI
def updateUi(self, text):
self.browser.append(text)
# Create connection to server
def connectToServer(self):
self.connectButton.setEnabled(False)
self.socket.connectToHost("localhost", PORT)
def issueRequest(self):
self.request = QByteArray()
stream = QDataStream(self.request, QIODevice.WriteOnly)
stream.setVersion(QDataStream.Qt_4_2)
stream.writeUInt32(0)
stream.writeQString(self.lineedit.text())
stream.device().seek(0)
stream.writeUInt32(self.request.size() - SIZEOF_UINT32)
self.socket.write(self.request)
self.nextBlockSize = 0
self.request = None
self.lineedit.setText("")
def readFromServer(self):
stream = QDataStream(self.socket)
stream.setVersion(QDataStream.Qt_4_2)
while True:
if self.nextBlockSize == 0:
if self.socket.bytesAvailable() < SIZEOF_UINT32:
break
self.nextBlockSize = stream.readUInt32()
if self.socket.bytesAvailable() < self.nextBlockSize:
break
textFromServer = stream.readQString()
self.updateUi(textFromServer)
self.nextBlockSize = 0
def serverHasStopped(self):
self.socket.close()
self.connectButton.setEnabled(True)
def serverHasError(self):
self.updateUi("Error: {}".format(
self.socket.errorString()))
self.socket.close()
self.connectButton.setEnabled(True)
app = QApplication(sys.argv)
form = Form()
form.show()
app.exec_()
To summarize, each client connection opens a socket, and the socket is appended to a list of all client sockets. Then, when one of the clients sends text, the server loops over the client sockets, finds the one that has bytesAvailable, reads it in, and then sends the message to the other clients.
I would be curious to hear what other people may think of this approach. Pitfalls, issues, etc.
Thanks!
Here is the shareable code for PyQt5!
QTcpServer ==================
import sys
from PyQt5.QtCore import Qt, QDataStream, QByteArray, QIODevice, pyqtSignal
from PyQt5.QtWidgets import QApplication, QPushButton
from PyQt5.QtNetwork import QTcpServer, QHostAddress
PORT = 9999
SIZEOF_UINT32 = 4
class ServerDlg(QPushButton):
def __init__(self, parent=None):
super(ServerDlg, self).__init__(
"&Close Server", parent)
self.setWindowFlags(Qt.WindowStaysOnTopHint)
self.tcpServer = QTcpServer(self)
self.tcpServer.listen(QHostAddress("127.0.0.1"), PORT)
self.tcpServer.newConnection.connect(self.addConnection)
self.connections = []
self.clicked.connect(self.close)
font = self.font()
font.setPointSize(24)
self.setFont(font)
self.setWindowTitle("Server")
def addConnection(self):
clientConnection = self.tcpServer.nextPendingConnection()
clientConnection.nextBlockSize = 0
self.connections.append(clientConnection)
clientConnection.readyRead.connect(self.receiveMessage)
clientConnection.disconnected.connect(self.removeConnection)
clientConnection.errorOccurred.connect(self.socketError)
def receiveMessage(self):
for s in self.connections:
if s.bytesAvailable() > 0:
stream = QDataStream(s)
stream.setVersion(QDataStream.Qt_4_2)
if s.nextBlockSize == 0:
if s.bytesAvailable() < SIZEOF_UINT32:
return
s.nextBlockSize = stream.readUInt32()
if s.bytesAvailable() < s.nextBlockSize:
return
textFromClient = stream.readQString()
s.nextBlockSize = 0
self.sendMessage(textFromClient,
s.socketDescriptor())
s.nextBlockSize = 0
print('Connections ', self.connections)
def sendMessage(self, text, socketId):
print('Text ', text)
for s in self.connections:
if s.socketDescriptor() == socketId:
message = "You> {}".format(text)
else:
message = "{}> {}".format(socketId, text)
reply = QByteArray()
stream = QDataStream(reply, QIODevice.WriteOnly)
stream.setVersion(QDataStream.Qt_4_2)
stream.writeUInt32(0)
stream.writeQString(message)
stream.device().seek(0)
stream.writeUInt32(reply.size() - SIZEOF_UINT32)
s.write(reply)
def removeConnection(self):
pass
def socketError(self):
pass
app = QApplication(sys.argv)
form = ServerDlg()
form.show()
form.move(0, 0)
app.exec_()