mirror of https://github.com/kubernetes/kops.git
131 lines
3.7 KiB
Go
131 lines
3.7 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package flagbuilder
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import (
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"fmt"
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"reflect"
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"sort"
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"strings"
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"github.com/golang/glog"
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"k8s.io/kops/upup/pkg/fi/utils"
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metav1 "k8s.io/kubernetes/pkg/apis/meta/v1"
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)
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// BuildFlags builds flag arguments based on "flag" tags on the structure
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func BuildFlags(options interface{}) (string, error) {
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var flags []string
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walker := func(path string, field *reflect.StructField, val reflect.Value) error {
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if field == nil {
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glog.V(8).Infof("ignoring non-field: %s", path)
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return nil
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}
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tag := field.Tag.Get("flag")
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if tag == "" {
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glog.V(4).Infof("not writing field with no flag tag: %s", path)
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// We want to descend - it could be a structure containing flags
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return nil
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}
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if tag == "-" {
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glog.V(4).Infof("skipping field with %q flag tag: %s", tag, path)
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return utils.SkipReflection
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}
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flagName := tag
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// We do have to do this, even though the recursive walk will do it for us
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// because when we descend we won't have `field` set
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if val.Kind() == reflect.Ptr {
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if val.IsNil() {
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return nil
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}
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val = val.Elem()
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}
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if val.Kind() == reflect.Map {
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if val.IsNil() {
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return nil
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}
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// We handle a map[string]string like --node-labels=k1=v1,k2=v2 etc
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// As we need more formats we can add additional spec to the flags tag
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if stringStringMap, ok := val.Interface().(map[string]string); ok {
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var args []string
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for k, v := range stringStringMap {
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arg := fmt.Sprintf("%s=%s", k, v)
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args = append(args, arg)
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}
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if len(args) != 0 {
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flag := fmt.Sprintf("--%s=%s", flagName, strings.Join(args, ","))
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flags = append(flags, flag)
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}
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return utils.SkipReflection
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} else {
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return fmt.Errorf("BuildFlags of value type not handled: %T %s=%v", val.Interface(), path, val.Interface())
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}
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}
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if val.Kind() == reflect.Slice {
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if val.IsNil() {
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return nil
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}
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// We handle a []string like --admission-control=v1,v2 etc
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if stringSlice, ok := val.Interface().([]string); ok {
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if len(stringSlice) != 0 {
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flag := fmt.Sprintf("--%s=%s", flagName, strings.Join(stringSlice, ","))
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flags = append(flags, flag)
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}
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return utils.SkipReflection
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} else {
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return fmt.Errorf("BuildFlags of value type not handled: %T %s=%v", val.Interface(), path, val.Interface())
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}
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}
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var flag string
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switch v := val.Interface().(type) {
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case string:
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vString := fmt.Sprintf("%v", v)
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if vString != "" {
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flag = fmt.Sprintf("--%s=%s", flagName, vString)
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}
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case bool, int, int32, int64, float32, float64:
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vString := fmt.Sprintf("%v", v)
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flag = fmt.Sprintf("--%s=%s", flagName, vString)
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case metav1.Duration:
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vString := v.Duration.String()
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flag = fmt.Sprintf("--%s=%s", flagName, vString)
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default:
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return fmt.Errorf("BuildFlags of value type not handled: %T %s=%v", v, path, v)
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}
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if flag != "" {
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flags = append(flags, flag)
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}
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// Nothing more to do here
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return utils.SkipReflection
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}
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err := utils.ReflectRecursive(reflect.ValueOf(options), walker)
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if err != nil {
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return "", err
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}
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// Sort so that the order is stable across runs
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sort.Strings(flags)
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return strings.Join(flags, " "), nil
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}
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