Merge pull request #22 from caugner/batch-translation

Add support for batch translation

README.md

@@ -92,6 +92,7 @@ docker-compose up -d --build
 | --port        | Set port to bind the server to | `5000`               |
 | --char-limit        | Set character limit | `No limit`               |
 | --req-limit        | Set maximum number of requests per minute per client | `No limit`               |
+| --batch-limit        | Set maximum number of texts to translate in a batch request | `No limit`               |
 | --ga-id        | Enable Google Analytics on the API client page by providing an ID | `No tracking`               |
 | --debug      | Enable debug environment | `False`           |
 | --ssl        | Whether to enable SSL | `False`               |

app/app.py

@@ -13,7 +13,7 @@ def get_remote_address():
 
     return ip
 
-def create_app(char_limit=-1, req_limit=-1, ga_id=None, debug=False, frontend_language_source="en", frontend_language_target="en"):
+def create_app(char_limit=-1, req_limit=-1, batch_limit=-1, ga_id=None, debug=False, frontend_language_source="en", frontend_language_target="en"):
     from app.init import boot
     boot()
 
@@ -126,10 +126,13 @@ def create_app(char_limit=-1, req_limit=-1, ga_id=None, debug=False, frontend_la
           - in: formData
             name: q
             schema:
-              type: string
+              oneOf:
+                - type: string
                   example: Hello world!
+                - type: array
+                  example: ['Hello world!']
             required: true
-            description: Text to translate
+            description: Text(s) to translate
           - in: formData
             name: source
             schema:
@@ -152,8 +155,10 @@ def create_app(char_limit=-1, req_limit=-1, ga_id=None, debug=False, frontend_la
               type: object
               properties:
                 translatedText:
-                  type: string
-                  description: Translated text
+                  oneOf:
+                    - type: string
+                    - type: array
+                  description: Translated text(s)
           400:
             description: Invalid request
             schema:
@@ -200,8 +205,21 @@ def create_app(char_limit=-1, req_limit=-1, ga_id=None, debug=False, frontend_la
         if not target_lang:
             abort(400, description="Invalid request: missing target parameter")
 
+        batch = isinstance(q, list)
+
+        if batch and batch_limit != -1:
+          batch_size = len(q)
+          if batch_limit < batch_size:
+            abort(400, description="Invalid request: Request (%d) exceeds text limit (%d)" % (batch_size, batch_limit))
+
         if char_limit != -1:
-            q = q[:char_limit]
+            if batch:
+              chars = sum([len(text) for text in q])
+            else:
+              chars = len(q)
+
+            if char_limit < chars:
+              abort(400, description="Invalid request: Request (%d) exceeds character limit (%d)" % (chars, char_limit))
 
         if source_lang == 'auto':
             candidate_langs = list(filter(lambda l: l.lang in language_map, detect_langs(q)))
@@ -230,7 +248,11 @@ def create_app(char_limit=-1, req_limit=-1, ga_id=None, debug=False, frontend_la
             abort(400, description="%s is not supported" % target_lang)
 
         translator = src_lang.get_translation(tgt_lang)
+
         try:
+          if batch:
+            return jsonify({"translatedText": [translator.translate(text) for text in q] })
+          else:
             return jsonify({"translatedText": translator.translate(q) })
         except Exception as e:
             abort(500, description="Cannot translate text: %s" % str(e))

main.py

@@ -10,6 +10,8 @@ parser.add_argument('--char-limit', default=-1, type=int, metavar="<number of ch
                     help='Set character limit (%(default)s)')
 parser.add_argument('--req-limit', default=-1, type=int, metavar="<number>",
                     help='Set maximum number of requests per minute per client (%(default)s)')
+parser.add_argument('--batch-limit', default=-1, type=int, metavar="<number of texts>",
+                    help='Set maximum number of texts to translate in a batch request (%(default)s)')
 parser.add_argument('--ga-id', type=str, default=None, metavar="<GA ID>",
                     help='Enable Google Analytics on the API client page by providing an ID (%(default)s)')
 parser.add_argument('--debug', default=False, action="store_true",
@@ -27,6 +29,7 @@ args = parser.parse_args()
 if __name__ == "__main__":
     app = create_app(char_limit=args.char_limit,
                      req_limit=args.req_limit,
+                     batch_limit=args.batch_limit,
                      ga_id=args.ga_id,
                      debug=args.debug,
                      frontend_language_source=args.frontend_language_source,