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BackEnd

README.md

Backend code

Backend code created in python within AWS lambda function.

Description

Function called from an API Gateway (translate-API), receive two parameters to get a translation.

List of parameters

event: array to receive parameters from API

This function is called from an API Gateway (translate-API), receive three parameters inside an array to get a translation.
    event: array to receive parameters from API
    event['queryStringParameters']['TargetLang']: Target language for translate
    event['queryStringParameters']['Bucketkey']: s3 key object with transcription

Functionalities

Coding notes:

  1. If the source language is the same target language, a JSON is also stored using the original transcription text.
  2. AWS translate_text() allows 5000 bytes per request, so original transcription must be split in case its size is bigger. https://docs.aws.amazon.com/translate/latest/dg/what-is-limits.html
  3. Best practices for working with AWS Lambda functions https://docs.aws.amazon.com/lambda/latest/dg/best-practices.html
  4. Lambda, API Gateway and Bucket must be in the same server.
  5. Functionalities:
    • Detects if transcription (key) exists in Bucket. If not, returns 400
    • Returns translations already stored to improve efficiency
    • If no translation found, automatically detects transcription language. If language can't be detected, returns 400
    • If the target language is the same transcription language, converts transcription to JSON, store it and return it
    • If the target language is different than transcription language, it translates it, converts transcription to JSON, store it, return it. Stored file name: key_targetLanguage.srt (e.g: video1_es.srt)
    • Translates transcriptions bigger than 5000 bytes (maximum allowed by request), doing split without cutting sentences. Step for split can be 4990 for Unicode-8 general languages, but for very special characters languages, step must be as low as 600.
    • Returns 500 in case any error occurs during the translate/store task.

https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/s3.html#S3.Client.head_object

https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/s3.html#S3.Client.get_object

https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/translate.html

https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/translate.html#Translate.Client.start_text_translation_job

https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/comprehend.html

Return

'''Resonse dictionary '''
resp = {    'statusCode': 200,
            'headers': {'Content-Type': 'application/json',
                        'Access-Control-Allow-Origin': '*',
                        'targetKey': targetkey
                        },
                        'body': json.dumps([])
        }

Built With

  • AWS console

Authors