113 lines
3.3 KiB
Go
113 lines
3.3 KiB
Go
// Copyright 2015 CNI authors
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//
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package types
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import (
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"encoding"
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"fmt"
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"reflect"
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"strings"
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)
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// UnmarshallableBool typedef for builtin bool
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// because builtin type's methods can't be declared
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type UnmarshallableBool bool
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// UnmarshalText implements the encoding.TextUnmarshaler interface.
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// Returns boolean true if the string is "1" or "[Tt]rue"
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// Returns boolean false if the string is "0" or "[Ff]alse"
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func (b *UnmarshallableBool) UnmarshalText(data []byte) error {
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s := strings.ToLower(string(data))
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switch s {
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case "1", "true":
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*b = true
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case "0", "false":
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*b = false
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default:
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return fmt.Errorf("boolean unmarshal error: invalid input %s", s)
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}
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return nil
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}
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// UnmarshallableString typedef for builtin string
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type UnmarshallableString string
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// UnmarshalText implements the encoding.TextUnmarshaler interface.
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// Returns the string
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func (s *UnmarshallableString) UnmarshalText(data []byte) error {
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*s = UnmarshallableString(data)
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return nil
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}
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// CommonArgs contains the IgnoreUnknown argument
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// and must be embedded by all Arg structs
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type CommonArgs struct {
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IgnoreUnknown UnmarshallableBool `json:"ignoreunknown,omitempty"`
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}
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// GetKeyField is a helper function to receive Values
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// Values that represent a pointer to a struct
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func GetKeyField(keyString string, v reflect.Value) reflect.Value {
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return v.Elem().FieldByName(keyString)
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}
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// UnmarshalableArgsError is used to indicate error unmarshalling args
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// from the args-string in the form "K=V;K2=V2;..."
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type UnmarshalableArgsError struct {
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error
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}
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// LoadArgs parses args from a string in the form "K=V;K2=V2;..."
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func LoadArgs(args string, container interface{}) error {
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if args == "" {
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return nil
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}
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containerValue := reflect.ValueOf(container)
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pairs := strings.Split(args, ";")
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unknownArgs := []string{}
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for _, pair := range pairs {
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kv := strings.Split(pair, "=")
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if len(kv) != 2 {
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return fmt.Errorf("ARGS: invalid pair %q", pair)
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}
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keyString := kv[0]
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valueString := kv[1]
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keyField := GetKeyField(keyString, containerValue)
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if !keyField.IsValid() {
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unknownArgs = append(unknownArgs, pair)
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continue
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}
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keyFieldIface := keyField.Addr().Interface()
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u, ok := keyFieldIface.(encoding.TextUnmarshaler)
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if !ok {
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return UnmarshalableArgsError{fmt.Errorf(
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"ARGS: cannot unmarshal into field '%s' - type '%s' does not implement encoding.TextUnmarshaler",
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keyString, reflect.TypeOf(keyFieldIface))}
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}
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err := u.UnmarshalText([]byte(valueString))
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if err != nil {
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return fmt.Errorf("ARGS: error parsing value of pair %q: %v)", pair, err)
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}
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}
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isIgnoreUnknown := GetKeyField("IgnoreUnknown", containerValue).Bool()
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if len(unknownArgs) > 0 && !isIgnoreUnknown {
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return fmt.Errorf("ARGS: unknown args %q", unknownArgs)
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}
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return nil
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}
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