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"""This module contains a Google Cloud Translate Speech operator."""
from typing import TYPE_CHECKING, Optional, Sequence, Union
from google.cloud.speech_v1.types import RecognitionAudio, RecognitionConfig
from google.protobuf.json_format import MessageToDict
from airflow.exceptions import AirflowException
from airflow.models import BaseOperator
from airflow.providers.google.cloud.hooks.speech_to_text import CloudSpeechToTextHook
from airflow.providers.google.cloud.hooks.translate import CloudTranslateHook
if TYPE_CHECKING:
from airflow.utils.context import Context
[docs]class CloudTranslateSpeechOperator(BaseOperator):
"""
Recognizes speech in audio input and translates it.
Note that it uses the first result from the recognition api response - the one with the highest confidence
In order to see other possible results please use
:ref:`howto/operator:CloudSpeechToTextRecognizeSpeechOperator`
and
:ref:`howto/operator:CloudTranslateTextOperator`
separately
.. seealso::
For more information on how to use this operator, take a look at the guide:
:ref:`howto/operator:CloudTranslateSpeechOperator`
See https://cloud.google.com/translate/docs/translating-text
Execute method returns string object with the translation
This is a list of dictionaries queried value.
Dictionary typically contains three keys (though not
all will be present in all cases).
* ``detectedSourceLanguage``: The detected language (as an
ISO 639-1 language code) of the text.
* ``translatedText``: The translation of the text into the
target language.
* ``input``: The corresponding input value.
* ``model``: The model used to translate the text.
Dictionary is set as XCom return value.
:param audio: audio data to be recognized. See more:
https://googleapis.github.io/google-cloud-python/latest/speech/gapic/v1/types.html#google.cloud.speech_v1.types.RecognitionAudio
:param config: information to the recognizer that specifies how to process the request. See more:
https://googleapis.github.io/google-cloud-python/latest/speech/gapic/v1/types.html#google.cloud.speech_v1.types.RecognitionConfig
:param target_language: The language to translate results into. This is required by the API and defaults
to the target language of the current instance.
Check the list of available languages here: https://cloud.google.com/translate/docs/languages
:param format_: (Optional) One of ``text`` or ``html``, to specify
if the input text is plain text or HTML.
:param source_language: (Optional) The language of the text to
be translated.
:param model: (Optional) The model used to translate the text, such
as ``'base'`` or ``'nmt'``.
:param project_id: Optional, Google Cloud Project ID where the Compute
Engine Instance exists. If set to None or missing, the default project_id from the Google Cloud
connection is used.
:param gcp_conn_id: Optional, The connection ID used to connect to Google Cloud.
Defaults to 'google_cloud_default'.
:param impersonation_chain: Optional service account to impersonate using short-term
credentials, or chained list of accounts required to get the access_token
of the last account in the list, which will be impersonated in the request.
If set as a string, the account must grant the originating account
the Service Account Token Creator IAM role.
If set as a sequence, the identities from the list must grant
Service Account Token Creator IAM role to the directly preceding identity, with first
account from the list granting this role to the originating account (templated).
"""
# [START translate_speech_template_fields]
[docs] template_fields: Sequence[str] = (
'target_language',
'format_',
'source_language',
'model',
'project_id',
'gcp_conn_id',
'impersonation_chain',
)
# [END translate_speech_template_fields]
def __init__(
self,
*,
audio: RecognitionAudio,
config: RecognitionConfig,
target_language: str,
format_: str,
source_language: Optional[str],
model: str,
project_id: Optional[str] = None,
gcp_conn_id: str = 'google_cloud_default',
impersonation_chain: Optional[Union[str, Sequence[str]]] = None,
**kwargs,
) -> None:
super().__init__(**kwargs)
self.audio = audio
self.config = config
self.target_language = target_language
self.format_ = format_
self.source_language = source_language
self.model = model
self.project_id = project_id
self.gcp_conn_id = gcp_conn_id
self.impersonation_chain = impersonation_chain
[docs] def execute(self, context: 'Context') -> dict:
speech_to_text_hook = CloudSpeechToTextHook(
gcp_conn_id=self.gcp_conn_id,
impersonation_chain=self.impersonation_chain,
)
translate_hook = CloudTranslateHook(
gcp_conn_id=self.gcp_conn_id,
impersonation_chain=self.impersonation_chain,
)
recognize_result = speech_to_text_hook.recognize_speech(config=self.config, audio=self.audio)
recognize_dict = MessageToDict(recognize_result)
self.log.info("Recognition operation finished")
if not recognize_dict['results']:
self.log.info("No recognition results")
return {}
self.log.debug("Recognition result: %s", recognize_dict)
try:
transcript = recognize_dict['results'][0]['alternatives'][0]['transcript']
except KeyError as key:
raise AirflowException(
f"Wrong response '{recognize_dict}' returned - it should contain {key} field"
)
try:
translation = translate_hook.translate(
values=transcript,
target_language=self.target_language,
format_=self.format_,
source_language=self.source_language,
model=self.model,
)
self.log.info('Translated output: %s', translation)
return translation
except ValueError as e:
self.log.error('An error has been thrown from translate speech method:')
self.log.error(e)
raise AirflowException(e)
