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105 lines
1.8 KiB
Go
105 lines
1.8 KiB
Go
2 years ago
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package config
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import (
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"errors"
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"flag"
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"fmt"
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"log"
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"os"
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"gopkg.in/yaml.v2"
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)
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type Config struct {
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Env string `yaml:"env"`
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Server struct {
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Host string `yaml:"host"`
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Grpc struct {
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Port int `yaml:"port"`
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} `yaml:"grpc"`
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Rest struct {
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Port int `yaml:"port"`
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} `yaml:"rest"`
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} `yaml:"server"`
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}
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func New() (*Config, error) {
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cfgPath, err := parseFlag()
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if err != nil {
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log.Fatal(err)
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}
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config := &Config{}
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file, err := os.Open(cfgPath)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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d := yaml.NewDecoder(file)
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if err := d.Decode(&config); err != nil {
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return nil, err
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}
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err = validateConfigData(config)
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if err != nil {
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return nil, err
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}
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return config, nil
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}
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func parseFlag() (string, error) {
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// String that contains the configured configuration path
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var configPath string
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// Set up a CLI flag called "-config" to allow users
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// to supply the configuration file
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flag.StringVar(&configPath, "config", "./config.yaml", "path to config file")
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// Actually parse the flags
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flag.Parse()
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//Validate the path first
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if err := validateConfigPath(configPath); err != nil {
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return "", err
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}
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return configPath, nil
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}
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// ValidateConfigPath just makes sure, that the path provided is a file,
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// that can be read
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func validateConfigPath(path string) error {
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s, err := os.Stat(path)
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if err != nil {
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return err
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}
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if s.IsDir() {
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return fmt.Errorf("'%s' is a directory, not a config file", path)
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}
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return nil
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}
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func validateConfigData(config *Config) error {
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if config.Env == "" {
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return errors.New("env is empty")
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}
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if config.Server.Host == "" {
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return errors.New("server.host is empty")
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}
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if config.Server.Grpc.Port == 0 {
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return errors.New("server.grpc.port is empty")
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}
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if config.Server.Rest.Port == 0 {
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return errors.New("server.rest.port is empty")
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}
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return nil
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}
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