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package util
import (
"fmt"
"github.com/spf13/viper"
"github.com/spiral/roadrunner/service"
"os"
"path/filepath"
"strings"
)
// configWrapper provides interface bridge between v configs and service.Config.
type configWrapper struct {
v *viper.Viper
}
// Get nested config section (sub-map), returns nil if section not found.
func (w *configWrapper) Get(key string) service.Config {
sub := w.v.Sub(key)
if sub == nil {
return nil
}
return &configWrapper{sub}
}
// Unmarshal unmarshal config data into given struct.
func (w *configWrapper) Unmarshal(out interface{}) error {
return w.v.Unmarshal(out)
}
// LoadConfig config and merge it's values with set of flags.
func LoadConfig(cfgFile string, path []string, name string, flags []string) (*configWrapper, error) {
cfg := viper.New()
if cfgFile != "" {
if absPath, err := filepath.Abs(cfgFile); err == nil {
cfgFile = absPath
// force working absPath related to config file
if err := os.Chdir(filepath.Dir(absPath)); err != nil {
return nil, err
}
}
// Use cfg file from the flag.
cfg.SetConfigFile(cfgFile)
if dir, err := filepath.Abs(cfgFile); err == nil {
// force working absPath related to config file
if err := os.Chdir(filepath.Dir(dir)); err != nil {
return nil, err
}
}
} else {
// automatic location
for _, p := range path {
cfg.AddConfigPath(p)
}
cfg.SetConfigName(name)
}
// read in environment variables that match
cfg.AutomaticEnv()
// If a cfg file is found, read it in.
if err := cfg.ReadInConfig(); err != nil {
return nil, err
}
if len(flags) != 0 {
for _, f := range flags {
k, v, err := parseFlag(f)
if err != nil {
return nil, err
}
cfg.Set(k, v)
}
merged := viper.New()
// we have to copy all the merged values into new config in order normalize it (viper bug?)
if err := merged.MergeConfigMap(cfg.AllSettings()); err != nil {
return nil, err
}
return &configWrapper{merged}, nil
}
return &configWrapper{cfg}, nil
}
func parseFlag(flag string) (string, string, error) {
if !strings.Contains(flag, "=") {
return "", "", fmt.Errorf("invalid flag `%s`", flag)
}
parts := strings.SplitN(strings.TrimLeft(flag, " \"'`"), "=", 2)
return strings.Trim(parts[0], " \n\t"), parseValue(strings.Trim(parts[1], " \n\t")), nil
}
func parseValue(value string) string {
escape := []rune(value)[0]
if escape == '"' || escape == '\'' || escape == '`' {
value = strings.Trim(value, string(escape))
value = strings.Replace(value, fmt.Sprintf("\\%s", string(escape)), string(escape), -1)
}
return value
}
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