/
env.go
174 lines (157 loc) · 4.48 KB
/
env.go
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package ec2config
import (
"encoding/json"
"fmt"
"os"
"reflect"
"strconv"
"strings"
)
// UpdateFromEnvs updates fields from environmental variables.
// Empty values are ignored and do not overwrite fields with empty values.
// WARNING: The environmental variable value always overwrites current field
// values if there's a conflict.
func (cfg *Config) UpdateFromEnvs() (err error) {
cfg.mu.Lock()
defer func() {
cfg.unsafeSync()
cfg.mu.Unlock()
}()
var vv interface{}
vv, err = parseEnvs(AWS_K8S_TESTER_EC2_PREFIX, cfg)
if err != nil {
return err
}
if av, ok := vv.(*Config); ok {
cfg = av
} else {
return fmt.Errorf("expected *Config, got %T", vv)
}
if cfg.S3 == nil {
cfg.S3 = &S3{}
}
vv, err = parseEnvs(AWS_K8S_TESTER_EC2_PREFIX+"S3_", cfg.S3)
if err != nil {
return err
}
if av, ok := vv.(*S3); ok {
cfg.S3 = av
} else {
return fmt.Errorf("expected *S3, got %T", vv)
}
if cfg.Role == nil {
cfg.Role = &Role{}
}
vv, err = parseEnvs(AWS_K8S_TESTER_EC2_PREFIX+"ROLE_", cfg.Role)
if err != nil {
return err
}
if av, ok := vv.(*Role); ok {
cfg.Role = av
} else {
return fmt.Errorf("expected *Role, got %T", vv)
}
if cfg.VPC == nil {
cfg.VPC = &VPC{}
}
vv, err = parseEnvs(AWS_K8S_TESTER_EC2_PREFIX+"VPC_", cfg.VPC)
if err != nil {
return err
}
if av, ok := vv.(*VPC); ok {
cfg.VPC = av
} else {
return fmt.Errorf("expected *VPC, got %T", vv)
}
return nil
}
func parseEnvs(pfx string, addOn interface{}) (interface{}, error) {
tp, vv := reflect.TypeOf(addOn).Elem(), reflect.ValueOf(addOn).Elem()
for i := 0; i < tp.NumField(); i++ {
jv := tp.Field(i).Tag.Get("json")
if jv == "" {
continue
}
jv = strings.Replace(jv, ",omitempty", "", -1)
jv = strings.ToUpper(strings.Replace(jv, "-", "_", -1))
env := pfx + jv
sv := os.Getenv(env)
if sv == "" {
continue
}
if tp.Field(i).Tag.Get("read-only") == "true" { // error when read-only field is set for update
return nil, fmt.Errorf("'%s=%s' is 'read-only' field; should not be set", env, sv)
}
fieldName := tp.Field(i).Name
switch vv.Field(i).Type().Kind() {
case reflect.String:
vv.Field(i).SetString(sv)
case reflect.Bool:
bb, err := strconv.ParseBool(sv)
if err != nil {
return nil, fmt.Errorf("failed to parse %q (field name %q, environmental variable key %q, error %v)", sv, fieldName, env, err)
}
vv.Field(i).SetBool(bb)
case reflect.Int, reflect.Int32, reflect.Int64:
iv, err := strconv.ParseInt(sv, 10, 64)
if err != nil {
return nil, fmt.Errorf("failed to parse %q (field name %q, environmental variable key %q, error %v)", sv, fieldName, env, err)
}
vv.Field(i).SetInt(iv)
case reflect.Uint, reflect.Uint32, reflect.Uint64:
iv, err := strconv.ParseUint(sv, 10, 64)
if err != nil {
return nil, fmt.Errorf("failed to parse %q (field name %q, environmental variable key %q, error %v)", sv, fieldName, env, err)
}
vv.Field(i).SetUint(iv)
case reflect.Float32, reflect.Float64:
fv, err := strconv.ParseFloat(sv, 64)
if err != nil {
return nil, fmt.Errorf("failed to parse %q (field name %q, environmental variable key %q, error %v)", sv, fieldName, env, err)
}
vv.Field(i).SetFloat(fv)
case reflect.Slice: // only supports "[]string" for now
ss := strings.Split(sv, ",")
if len(ss) < 1 {
continue
}
slice := reflect.MakeSlice(reflect.TypeOf([]string{}), len(ss), len(ss))
for j := range ss {
slice.Index(j).SetString(ss[j])
}
vv.Field(i).Set(slice)
case reflect.Map:
switch fieldName {
case "ASGs":
asgs := make(map[string]ASG)
if err := json.Unmarshal([]byte(sv), &asgs); err != nil {
return nil, fmt.Errorf("failed to parse %q (field name %q, environmental variable key %q, error %v)", sv, fieldName, env, err)
}
for k, v := range asgs {
tp2, vv2 := reflect.TypeOf(&v).Elem(), reflect.ValueOf(&v).Elem()
for j := 0; j < tp2.NumField(); j++ {
jv := tp2.Field(j).Tag.Get("json")
if jv == "" {
continue
}
if tp2.Field(j).Tag.Get("read-only") != "true" {
continue
}
if vv2.Field(j).Type().Kind() != reflect.String {
continue
}
// skip updating read-only field
vv2.Field(j).SetString("")
}
asgs[k] = v
}
vv.Field(i).Set(reflect.ValueOf(asgs))
default:
return nil, fmt.Errorf("field %q not supported for reflect.Map", fieldName)
}
default:
return nil, fmt.Errorf("%q (type %v) is not supported as an env", env, vv.Field(i).Type())
}
}
return addOn, nil
}