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package util
import (
"bytes"
"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, jsonConfig 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()
cfg.SetEnvPrefix("rr")
cfg.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
// If a cfg file is found, read it in.
if err := cfg.ReadInConfig(); err != nil {
if len(flags) == 0 && jsonConfig == "" {
return nil, err
}
}
// merge included configs
if include, ok := cfg.Get("include").([]interface{}); ok {
for _, file := range include {
filename, ok := file.(string)
if !ok {
continue
}
partial := viper.New()
partial.AutomaticEnv()
partial.SetEnvPrefix("rr")
partial.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
partial.SetConfigFile(filename)
if err := partial.ReadInConfig(); err != nil {
return nil, err
}
// merging
if err := cfg.MergeConfigMap(partial.AllSettings()); err != nil {
return nil, err
}
}
}
// automatically inject ENV variables using ${ENV} pattern
for _, key := range cfg.AllKeys() {
val := cfg.Get(key)
cfg.Set(key, parseEnv(val))
}
// merge with console flags
if len(flags) != 0 {
for _, f := range flags {
k, v, err := parseFlag(f)
if err != nil {
return nil, err
}
cfg.Set(k, v)
}
}
if jsonConfig != "" {
jConfig := viper.New()
jConfig.AutomaticEnv()
jConfig.SetEnvPrefix("rr")
jConfig.SetEnvKeyReplacer(strings.NewReplacer(".", "_"))
jConfig.SetConfigType("json")
if err := jConfig.ReadConfig(bytes.NewBufferString(jsonConfig)); err != nil {
return nil, err
}
// merging
if err := cfg.MergeConfigMap(jConfig.AllSettings()); err != nil {
return nil, err
}
}
merged := viper.New()
// we have to copy all the merged values into new config in order normalize it (viper bug?)
if err := merged.MergeConfigMap(cfg.AllSettings()); err != nil {
return nil, err
}
return &ConfigWrapper{merged}, nil
}
func parseFlag(flag string) (string, string, error) {
if !strings.Contains(flag, "=") {
return "", "", fmt.Errorf("invalid flag `%s`", flag)
}
parts := strings.SplitN(strings.TrimLeft(flag, " \"'`"), "=", 2)
return strings.Trim(parts[0], " \n\t"), parseValue(strings.Trim(parts[1], " \n\t")), nil
}
func parseValue(value string) string {
escape := []rune(value)[0]
if escape == '"' || escape == '\'' || escape == '`' {
value = strings.Trim(value, string(escape))
value = strings.Replace(value, fmt.Sprintf("\\%s", string(escape)), string(escape), -1)
}
return value
}
func parseEnv(value interface{}) interface{} {
str, ok := value.(string)
if !ok || len(str) <= 3 {
return value
}
if str[0:2] == "${" && str[len(str)-1:] == "}" {
if v, ok := os.LookupEnv(str[2 : len(str)-1]); ok {
return v
}
}
return str
}
|
