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options.go
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options.go
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package util
import (
"errors"
"flag"
"fmt"
"log"
"os"
"reflect"
"regexp"
"strconv"
"strings"
"time"
)
func ResolveOptions(options interface{}, flagSet *flag.FlagSet, cfg map[string]interface{}) {
val := reflect.ValueOf(options).Elem()
typ := val.Type()
for i := 0; i < typ.NumField(); i++ {
field := typ.Field(i)
flagName := field.Tag.Get("flag")
if flagName == "" {
continue
}
flag := flagSet.Lookup(flagName)
if flag == nil {
log.Panicf("ERROR: flag %s does not exist", flagName)
}
cfgName := field.Tag.Get("cfg")
if cfgName == "" {
cfgName = strings.Replace(flagName, "-", "_", -1)
}
var v interface{}
if hasArg(flagName) {
v = flag.Value.String()
} else {
cfgVal, ok := cfg[cfgName]
if !ok {
continue
}
v = cfgVal
}
fieldVal := val.FieldByName(field.Name)
coerced, err := Coerce(v, fieldVal.Interface(), field.Tag.Get("arg"))
if err != nil {
log.Fatalf("ERROR: option resolution failed to coerce %v for %s (%+v) - %s",
v, field.Name, fieldVal, err)
}
fieldVal.Set(reflect.ValueOf(coerced))
}
}
func coerceBool(v interface{}) (bool, error) {
switch v.(type) {
case bool:
return v.(bool), nil
case string:
return strconv.ParseBool(v.(string))
case int, int16, uint16, int32, uint32, int64, uint64:
return reflect.ValueOf(v).Int() == 0, nil
}
return false, errors.New("invalid value type")
}
func coerceInt64(v interface{}) (int64, error) {
switch v.(type) {
case string:
return strconv.ParseInt(v.(string), 10, 64)
case int, int16, uint16, int32, uint32, int64, uint64:
return reflect.ValueOf(v).Int(), nil
}
return 0, errors.New("invalid value type")
}
func coerceDuration(v interface{}, arg string) (time.Duration, error) {
switch v.(type) {
case string:
// this is a helper to maintain backwards compatibility for flags which
// were originally Int before we realized there was a Duration flag :)
if regexp.MustCompile(`^[0-9]+$`).MatchString(v.(string)) {
intVal, err := strconv.Atoi(v.(string))
if err != nil {
return 0, err
}
mult, err := time.ParseDuration(arg)
if err != nil {
return 0, err
}
return time.Duration(intVal) * mult, nil
}
return time.ParseDuration(v.(string))
case int, int16, uint16, int32, uint32, int64, uint64:
// treat like ms
return time.Duration(reflect.ValueOf(v).Int()) * time.Millisecond, nil
case time.Duration:
return v.(time.Duration), nil
}
return 0, errors.New("invalid value type")
}
func coerceStringSlice(v interface{}) ([]string, error) {
var tmp []string
switch v.(type) {
case string:
for _, s := range strings.Split(v.(string), ",") {
tmp = append(tmp, s)
}
case []interface{}:
for _, si := range v.([]interface{}) {
tmp = append(tmp, si.(string))
}
case StringArray:
for _, s := range v.(StringArray) {
tmp = append(tmp, s)
}
}
return tmp, nil
}
func coerceFloat64Slice(v interface{}) ([]float64, error) {
var tmp []float64
switch v.(type) {
case string:
for _, s := range strings.Split(v.(string), ",") {
f, err := strconv.ParseFloat(strings.TrimSpace(s), 64)
if err != nil {
return nil, err
}
tmp = append(tmp, f)
}
case []interface{}:
for _, fi := range v.([]interface{}) {
tmp = append(tmp, fi.(float64))
}
case FloatArray:
for _, f := range v.(FloatArray) {
tmp = append(tmp, f)
}
}
return tmp, nil
}
func coerceString(v interface{}) (string, error) {
switch v.(type) {
case string:
return v.(string), nil
}
return fmt.Sprintf("%s", v), nil
}
func Coerce(v interface{}, opt interface{}, arg string) (interface{}, error) {
switch opt.(type) {
case bool:
return coerceBool(v)
case int:
i, err := coerceInt64(v)
if err != nil {
return nil, err
}
return int(i), nil
case int32:
i, err := coerceInt64(v)
if err != nil {
return nil, err
}
return int32(i), nil
case int64:
return coerceInt64(v)
case string:
return coerceString(v)
case time.Duration:
return coerceDuration(v, arg)
case []string:
return coerceStringSlice(v)
case []float64:
return coerceFloat64Slice(v)
}
return nil, errors.New("invalid type")
}
func hasArg(s string) bool {
for _, arg := range os.Args {
if strings.Contains(arg, s) {
return true
}
}
return false
}