I am having difficulties accessing Google's texttospeech Python API from within a Flask app. The app is running in a container with Debian 10, Nginx/Gunicorn, and Python 3.7 installed. In the code below, the client connects successfully, but the synthesize_speech request hangs indefinitely (without any error message). When I run the same code from a Python script in the same container without Flask, the speech synthesis request is successful. However, I can call other external APIs, such as those at AWS, from my Flask app without any problems.
What could be causing this or how I could go about diagnosing the problem? I have tried switching to version 1.0.1 of the texttospeech library, but without success. Presumably the problem isn't my credentials, which I believe I have set up correctly, as otherwise the connection request wouldn't be successful.
from google.cloud import texttospeech
# Connect (this is successful)
client = texttospeech.TextToSpeechClient()
input_text = texttospeech.SynthesisInput(text="God dag")
voice_parameters = texttospeech.VoiceSelectionParams(
language_code="sv-SE",
name="sv-SE-Wavenet-A"
)
audio_config = texttospeech.AudioConfig(
audio_encoding=texttospeech.AudioEncoding.MP3
)
# Synthesize speech (this never completes)
response = client.synthesize_speech(
request={
"input": input_text,
"voice": voice_parameters,
"audio_config": audio_config
}
)
pip freeze
google-api-core==1.22.1
google-auth==1.20.1
google-cloud-texttospeech==2.2.0
googleapis-common-protos==1.52.0
grpcio==1.31.0
...