Fix audio service startup without Internet

mycroft/tts/google_tts.py

@@ -17,18 +17,84 @@
 
 from .tts import TTS, TTSValidator
 
-supported_langs = tts_langs()
+from mycroft.util.log import LOG
+
+# Live list of languages
+# Cached list of supported languages (2020-05-27)
+_default_langs = {'af': 'Afrikaans', 'sq': 'Albanian', 'ar': 'Arabic',
+                  'hy': 'Armenian', 'bn': 'Bengali', 'bs': 'Bosnian',
+                  'ca': 'Catalan', 'hr': 'Croatian', 'cs': 'Czech',
+                  'da': 'Danish', 'nl': 'Dutch', 'en': 'English',
+                  'eo': 'Esperanto', 'et': 'Estonian', 'tl': 'Filipino',
+                  'fi': 'Finnish', 'fr': 'French', 'de': 'German',
+                  'el': 'Greek', 'gu': 'Gujarati', 'hi': 'Hindi',
+                  'hu': 'Hungarian', 'is': 'Icelandic', 'id': 'Indonesian',
+                  'it': 'Italian', 'ja': 'Japanese', 'jw': 'Javanese',
+                  'kn': 'Kannada', 'km': 'Khmer', 'ko': 'Korean',
+                  'la': 'Latin', 'lv': 'Latvian', 'mk': 'Macedonian',
+                  'ml': 'Malayalam', 'mr': 'Marathi',
+                  'my': 'Myanmar (Burmese)', 'ne': 'Nepali',
+                  'no': 'Norwegian', 'pl': 'Polish', 'pt': 'Portuguese',
+                  'ro': 'Romanian', 'ru': 'Russian', 'sr': 'Serbian',
+                  'si': 'Sinhala', 'sk': 'Slovak', 'es': 'Spanish',
+                  'su': 'Sundanese', 'sw': 'Swahili', 'sv': 'Swedish',
+                  'ta': 'Tamil', 'te': 'Telugu', 'th': 'Thai', 'tr': 'Turkish',
+                  'uk': 'Ukrainian', 'ur': 'Urdu', 'vi': 'Vietnamese',
+                  'cy': 'Welsh', 'zh-cn': 'Chinese (Mandarin/China)',
+                  'zh-tw': 'Chinese (Mandarin/Taiwan)',
+                  'en-us': 'English (US)', 'en-ca': 'English (Canada)',
+                  'en-uk': 'English (UK)', 'en-gb': 'English (UK)',
+                  'en-au': 'English (Australia)', 'en-gh': 'English (Ghana)',
+                  'en-in': 'English (India)', 'en-ie': 'English (Ireland)',
+                  'en-nz': 'English (New Zealand)',
+                  'en-ng': 'English (Nigeria)',
+                  'en-ph': 'English (Philippines)',
+                  'en-za': 'English (South Africa)',
+                  'en-tz': 'English (Tanzania)', 'fr-ca': 'French (Canada)',
+                  'fr-fr': 'French (France)', 'pt-br': 'Portuguese (Brazil)',
+                  'pt-pt': 'Portuguese (Portugal)', 'es-es': 'Spanish (Spain)',
+                  'es-us': 'Spanish (United States)'
+                  }
+
+
+_supported_langs = None
+
+
+def get_supported_langs():
+    """Get dict of supported languages.
+
+    Tries to fetch remote list, if that fails a local cache will be used.
+
+    Returns:
+        (dict): Lang code to lang name map.
+    """
+    global _supported_langs
+    if not _supported_langs:
+        try:
+            _supported_langs = tts_langs()
+        except Exception:
+            LOG.warning('Couldn\'t fetch upto date language codes')
+    return _supported_langs or _default_langs
 
 
 class GoogleTTS(TTS):
     """Interface to google TTS."""
     def __init__(self, lang, config):
-        if lang.lower() not in supported_langs and \
-                                     lang[:2].lower() in supported_langs:
-            lang = lang[:2]
+        self._google_lang = None
         super(GoogleTTS, self).__init__(lang, config, GoogleTTSValidator(
             self), 'mp3')
 
+    @property
+    def google_lang(self):
+        """Property containing a converted language code suitable for gTTS."""
+        supported_langs = get_supported_langs()
+        if not self._google_lang:
+            if self.lang.lower() in supported_langs:
+                self._google_lang = self.lang.lower()
+            elif self.lang[:2].lower() in supported_langs:
+                self._google_lang = self.lang[:2]
+        return self._google_lang or self.lang.lower()
+
     def get_tts(self, sentence, wav_file):
         """Fetch tts audio using gTTS.
 
@@ -38,7 +104,7 @@ def get_tts(self, sentence, wav_file):
         Returns:
             Tuple ((str) written file, None)
         """
-        tts = gTTS(text=sentence, lang=self.lang)
+        tts = gTTS(text=sentence, lang=self.google_lang)
         tts.save(wav_file)
         return (wav_file, None)  # No phonemes
 
@@ -48,10 +114,9 @@ def __init__(self, tts):
         super(GoogleTTSValidator, self).__init__(tts)
 
     def validate_lang(self):
-        lang = self.tts.lang
-        if lang.lower() not in supported_langs:
-            raise ValueError("Language not supported by gTTS: {}"
-                             .format(lang))
+        lang = self.tts.google_lang
+        if lang.lower() not in get_supported_langs():
+            raise ValueError("Language not supported by gTTS: {}".format(lang))
 
     def validate_connection(self):
         try:

test/unittests/tts/test_google_tts.py

@@ -2,6 +2,7 @@
 from unittest import mock
 
 from mycroft.tts.google_tts import GoogleTTS, GoogleTTSValidator
+import mycroft.tts.google_tts as google_tts_mod
 
 
 @mock.patch('mycroft.tts.google_tts.gTTS')
@@ -13,7 +14,7 @@ def test_get_tts(self, _, gtts_mock):
         tts = GoogleTTS('en-US', {})
         sentence = 'help me Obi-Wan Kenobi, you are my only hope'
         mp3_file, vis = tts.get_tts(sentence, 'output.mp3')
-        gtts_mock.assert_called_with(text=sentence, lang='en-US')
+        gtts_mock.assert_called_with(text=sentence, lang='en-us')
         gtts_response.save.assert_called_with('output.mp3')
 
     def test_validator(self, _, gtts_mock):
@@ -24,3 +25,13 @@ def sideeffect(**kwargs):
                 raise Exception
             gtts_mock.side_effect = sideeffect
             validator.validate_connection()
+
+    @mock.patch('mycroft.tts.google_tts.tts_langs')
+    def test_lang_connection_error(self, mock_get_langs, _, gtts_mock):
+        google_tts_mod._supported_langs = None
+
+        def sideeffect(**kwargs):
+            raise Exception
+        mock_get_langs.side_effect = sideeffect
+        tts = GoogleTTS('en-US', {})
+        self.assertEqual(tts.google_lang, 'en-us')