162 lines
5.1 KiB
Go
162 lines
5.1 KiB
Go
package config
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import (
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"fmt"
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"os"
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"time"
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"github.com/rs/zerolog/log"
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"github.com/spf13/viper"
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)
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// Config represents the application configuration
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type Config struct {
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Server ServerConfig `mapstructure:"server"`
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Shutdown ShutdownConfig `mapstructure:"shutdown"`
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Logging LoggingConfig `mapstructure:"logging"`
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Telemetry TelemetryConfig `mapstructure:"telemetry"`
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}
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// ServerConfig holds server-related configuration
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type ServerConfig struct {
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Host string `mapstructure:"host"`
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Port int `mapstructure:"port"`
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}
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// ShutdownConfig holds shutdown-related configuration
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type ShutdownConfig struct {
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Timeout time.Duration `mapstructure:"timeout"`
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}
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// LoggingConfig holds logging-related configuration
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type LoggingConfig struct {
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JSON bool `mapstructure:"json"`
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}
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// TelemetryConfig holds OpenTelemetry-related configuration
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type TelemetryConfig struct {
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Enabled bool `mapstructure:"enabled"`
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OTLPEndpoint string `mapstructure:"otlp_endpoint"`
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ServiceName string `mapstructure:"service_name"`
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Insecure bool `mapstructure:"insecure"`
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Sampler SamplerConfig `mapstructure:"sampler"`
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}
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// SamplerConfig holds tracing sampler configuration
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type SamplerConfig struct {
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Type string `mapstructure:"type"`
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Ratio float64 `mapstructure:"ratio"`
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}
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// LoadConfig loads configuration from file, environment variables, and defaults
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// Configuration priority: file > environment variables > defaults
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// To specify a custom config file path, set DLC_CONFIG_FILE environment variable
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func LoadConfig() (*Config, error) {
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v := viper.New()
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// Set default values
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v.SetDefault("server.host", "0.0.0.0")
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v.SetDefault("server.port", 8080)
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v.SetDefault("shutdown.timeout", 30*time.Second)
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v.SetDefault("logging.json", false)
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// Telemetry defaults
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v.SetDefault("telemetry.enabled", false)
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v.SetDefault("telemetry.otlp_endpoint", "localhost:4317")
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v.SetDefault("telemetry.service_name", "DanceLessonsCoach")
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v.SetDefault("telemetry.insecure", true)
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v.SetDefault("telemetry.sampler.type", "parentbased_always_on")
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v.SetDefault("telemetry.sampler.ratio", 1.0)
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// Check for custom config file path via environment variable
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if configFile := os.Getenv("DLC_CONFIG_FILE"); configFile != "" {
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v.SetConfigFile(configFile)
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log.Info().Str("config_file", configFile).Msg("Using custom config file path")
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} else {
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// Default: look for config.yaml in current directory
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v.SetConfigName("config")
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v.SetConfigType("yaml")
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v.AddConfigPath(".")
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}
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// Read config file if it exists
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if err := v.ReadInConfig(); err != nil {
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if _, ok := err.(viper.ConfigFileNotFoundError); !ok {
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// Config file was found but there was an error reading it
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log.Warn().Err(err).Msg("Error reading config file, using defaults")
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}
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// Config file not found, continue with environment variables and defaults
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} else {
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log.Info().Str("config_file", v.ConfigFileUsed()).Msg("Config file loaded")
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}
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// Bind environment variables
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v.AutomaticEnv()
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v.SetEnvPrefix("DLC") // DanceLessonsCoach prefix
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v.BindEnv("server.host", "DLC_SERVER_HOST")
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v.BindEnv("server.port", "DLC_SERVER_PORT")
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v.BindEnv("shutdown.timeout", "DLC_SHUTDOWN_TIMEOUT")
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v.BindEnv("logging.json", "DLC_LOGGING_JSON")
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// Telemetry environment variables
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v.BindEnv("telemetry.enabled", "DLC_TELEMETRY_ENABLED")
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v.BindEnv("telemetry.otlp_endpoint", "DLC_TELEMETRY_OTLP_ENDPOINT")
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v.BindEnv("telemetry.service_name", "DLC_TELEMETRY_SERVICE_NAME")
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v.BindEnv("telemetry.insecure", "DLC_TELEMETRY_INSECURE")
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v.BindEnv("telemetry.sampler.type", "DLC_TELEMETRY_SAMPLER_TYPE")
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v.BindEnv("telemetry.sampler.ratio", "DLC_TELEMETRY_SAMPLER_RATIO")
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// Unmarshal into Config struct
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var config Config
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if err := v.Unmarshal(&config); err != nil {
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log.Error().Err(err).Msg("Failed to unmarshal config")
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return nil, fmt.Errorf("config unmarshal error: %w", err)
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}
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log.Info().
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Str("host", config.Server.Host).
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Int("port", config.Server.Port).
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Dur("shutdown_timeout", config.Shutdown.Timeout).
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Bool("logging_json", config.Logging.JSON).
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Bool("telemetry_enabled", config.Telemetry.Enabled).
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Str("telemetry_service", config.Telemetry.ServiceName).
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Msg("Configuration loaded")
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return &config, nil
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}
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// GetServerAddress returns the formatted server address (host:port)
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func (c *Config) GetServerAddress() string {
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return fmt.Sprintf("%s:%d", c.Server.Host, c.Server.Port)
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}
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// GetTelemetryEnabled returns whether telemetry is enabled
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func (c *Config) GetTelemetryEnabled() bool {
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return c.Telemetry.Enabled
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}
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// GetOTLPEndpoint returns the OTLP endpoint for telemetry
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func (c *Config) GetOTLPEndpoint() string {
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return c.Telemetry.OTLPEndpoint
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}
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// GetServiceName returns the service name for telemetry
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func (c *Config) GetServiceName() string {
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return c.Telemetry.ServiceName
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}
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// GetTelemetryInsecure returns whether to use insecure connection
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func (c *Config) GetTelemetryInsecure() bool {
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return c.Telemetry.Insecure
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}
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// GetSamplerType returns the sampler type
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func (c *Config) GetSamplerType() string {
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return c.Telemetry.Sampler.Type
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}
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// GetSamplerRatio returns the sampler ratio
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func (c *Config) GetSamplerRatio() float64 {
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return c.Telemetry.Sampler.Ratio
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}
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