chore: Refactor Google Text-to-Speech configuration and key file paths

- Renamed `PathToKeyfile` to `PathToServiceAccountKeyFile` in `GoogleTextTOSpeechConfig`
- Renamed "google_credentials.json" to "google-service-account-key.json" in `.gitignore`
- Updated path to Google service account key file in `talk.sample.yaml`
- Updated language code, gender preference, speaking rate, pitch, and volume gain for Google Text-to-Speech in `talk.sample.yaml`
- Renamed `DefaultGoogleTTSPathToKeyfile` to `DefaultGoogleTTSPathToServiceAccountKeyFile` in `parse.go`
- Modified if statement and error message in `talker.go` for Google text-to-speech client initialization.

.gitignore

@@ -20,7 +20,7 @@
 # Do not touch the flowing 3 lines
 config.yaml
 talk.yaml
-google_credentials.json
+google-service-account-key.json
 
 # Go workspace file
 go.work

configs/talk.sample.yaml

@@ -29,7 +29,7 @@ text-to-speech:
     clarity: 0.5
   google-text-to-speech:
     # Download a key file from Google Cloud. see https://cloud.google.com/iam/docs/keys-create-delete#iam-service-account-keys-create-console
-    path-to-keyfile: ./google_credentials.json
+    path-to-service-account-key-file: ./google-service-account-key.json
     # Optional. Use en-US if not specified. Choose a language-code from  https://www.rfc-editor.org/rfc/bcp/bcp47.txt
     language-code: en-US
     # Optional. Use this voice whenever available, or randomly select a voice from the voice list

internal/config/config.go

@@ -34,13 +34,13 @@ type ElevenLabsConfig struct {
 }
 
 type GoogleTextTOSpeechConfig struct {
-	PathToKeyfile string  `mapstructure:"path-to-keyfile"`
-	LanguageCode  string  `mapstructure:"language-code"`
-	VoiceID       string  `mapstructure:"voice-id"`
-	Gender        string  `mapstructure:"gender"`
-	SpeakingRate  float32 `mapstructure:"speaking-rate"`
-	Pitch         float32 `mapstructure:"pitch"`
-	VolumeGainDb  float32 `mapstructure:"volume-gain-db"`
+	PathToServiceAccountKeyFile string  `mapstructure:"path-to-service-account-key-file"`
+	LanguageCode                string  `mapstructure:"language-code"`
+	VoiceID                     string  `mapstructure:"voice-id"`
+	Gender                      string  `mapstructure:"gender"`
+	SpeakingRate                float32 `mapstructure:"speaking-rate"`
+	Pitch                       float32 `mapstructure:"pitch"`
+	VolumeGainDb                float32 `mapstructure:"volume-gain-db"`
 }
 
 type LlmConfig struct {

internal/config/parse.go

@@ -8,18 +8,18 @@ import (
 )
 
 const (
-	DefaultServerPort                = 8000
-	DefaultServerEagerCheckProviders = true
-	DefaultElevenLabsStability       = 0.5
-	DefaultElevenLabsClarity         = 0.5
-	DefaultGoogleTTSPathToKeyfile    = "./google_credentials.json"
-	DefaultGoogleTTSLanguageCode     = "en-US"
-	DefaultGoogleTTSGender           = "female"
-	DefaultGoogleTTSSpeakingRate     = 1
-	DefaultGoogleTTSPitch            = 0
-	DefaultGoogleTTSVolumeGainDb     = 0
-	DefaultChatGPTModel              = "gpt-3.5-turbo"
-	DefaultChatGPTMaxGenerationToken = 2000
+	DefaultServerPort                           = 8000
+	DefaultServerEagerCheckProviders            = true
+	DefaultElevenLabsStability                  = 0.5
+	DefaultElevenLabsClarity                    = 0.5
+	DefaultGoogleTTSPathToServiceAccountKeyFile = "./google-service-account-key.json"
+	DefaultGoogleTTSLanguageCode                = "en-US"
+	DefaultGoogleTTSGender                      = "female"
+	DefaultGoogleTTSSpeakingRate                = 1
+	DefaultGoogleTTSPitch                       = 0
+	DefaultGoogleTTSVolumeGainDb                = 0
+	DefaultChatGPTModel                         = "gpt-3.5-turbo"
+	DefaultChatGPTMaxGenerationToken            = 2000
 )
 
 func setDefaultValue() {
@@ -29,7 +29,7 @@ func setDefaultValue() {
 	viper.SetDefault("text-to-speech.elevenlabs.stability", DefaultElevenLabsStability)
 	viper.SetDefault("text-to-speech.elevenlabs.clarity", DefaultElevenLabsClarity)
 
-	viper.SetDefault("text-to-speech.google-text-to-speech.path-to-keyfile", DefaultGoogleTTSPathToKeyfile)
+	viper.SetDefault("text-to-speech.google-text-to-speech.path-to-service-account-key-file", DefaultGoogleTTSPathToServiceAccountKeyFile)
 	viper.SetDefault("text-to-speech.google-text-to-speech.gender", DefaultGoogleTTSGender)
 	viper.SetDefault("text-to-speech.google-text-to-speech.language-code", DefaultGoogleTTSLanguageCode)
 	viper.SetDefault("text-to-speech.google-text-to-speech.speaking-rate", DefaultGoogleTTSSpeakingRate)

internal/talker.go

@@ -50,9 +50,9 @@ func NewTalker(ctx context.Context, tc config.TalkConfig, logger *zap.Logger) (*
 			Clarity:   c.Clarity,
 			Logger:    logger,
 		}
-	} else if c := tc.TextToSpeech.GoogleTextTOSpeech; c.PathToKeyfile != "" {
+	} else if c := tc.TextToSpeech.GoogleTextTOSpeech; c.PathToServiceAccountKeyFile != "" {
 		// todo if proxy is not supported, use http client instead
-		client, err := texttospeech.NewClient(ctx, option.WithCredentialsFile(c.PathToKeyfile))
+		client, err := texttospeech.NewClient(ctx, option.WithCredentialsFile(c.PathToServiceAccountKeyFile))
 		if err != nil {
 			return nil, errors.Wrap(err, "failed to initialise Google text-to-speech client")
 		}