mirror of https://github.com/grpc/grpc-go.git
141 lines
3.4 KiB
Go
141 lines
3.4 KiB
Go
/*
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*
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* Copyright 2019 gRPC 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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*
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*/
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/*
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Package flags provide convenience types and routines to accept specific types
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of flag values on the command line.
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*/
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package flags
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import (
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"bytes"
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"flag"
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"fmt"
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"strconv"
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"strings"
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"time"
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)
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// stringFlagWithAllowedValues represents a string flag which can only take a
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// predefined set of values.
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type stringFlagWithAllowedValues struct {
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val string
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allowed []string
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}
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// StringWithAllowedValues returns a flag variable of type
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// stringFlagWithAllowedValues configured with the provided parameters.
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// 'allowed` is the set of values that this flag can be set to.
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func StringWithAllowedValues(name, defaultVal, usage string, allowed []string) *string {
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as := &stringFlagWithAllowedValues{defaultVal, allowed}
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flag.CommandLine.Var(as, name, usage)
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return &as.val
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}
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// String implements the flag.Value interface.
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func (as *stringFlagWithAllowedValues) String() string {
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return as.val
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}
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// Set implements the flag.Value interface.
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func (as *stringFlagWithAllowedValues) Set(val string) error {
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for _, a := range as.allowed {
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if a == val {
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as.val = val
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return nil
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}
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}
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return fmt.Errorf("want one of: %v", strings.Join(as.allowed, ", "))
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}
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type durationSliceValue []time.Duration
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// DurationSlice returns a flag representing a slice of time.Duration objects.
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func DurationSlice(name string, defaultVal []time.Duration, usage string) *[]time.Duration {
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ds := make([]time.Duration, len(defaultVal))
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copy(ds, defaultVal)
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dsv := (*durationSliceValue)(&ds)
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flag.CommandLine.Var(dsv, name, usage)
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return &ds
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}
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// Set implements the flag.Value interface.
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func (dsv *durationSliceValue) Set(s string) error {
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ds := strings.Split(s, ",")
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var dd []time.Duration
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for _, n := range ds {
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d, err := time.ParseDuration(n)
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if err != nil {
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return err
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}
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dd = append(dd, d)
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}
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*dsv = durationSliceValue(dd)
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return nil
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}
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// String implements the flag.Value interface.
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func (dsv *durationSliceValue) String() string {
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var b bytes.Buffer
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for i, d := range *dsv {
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if i > 0 {
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b.WriteRune(',')
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}
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b.WriteString(d.String())
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}
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return b.String()
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}
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type intSliceValue []int
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// IntSlice returns a flag representing a slice of ints.
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func IntSlice(name string, defaultVal []int, usage string) *[]int {
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is := make([]int, len(defaultVal))
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copy(is, defaultVal)
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isv := (*intSliceValue)(&is)
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flag.CommandLine.Var(isv, name, usage)
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return &is
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}
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// Set implements the flag.Value interface.
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func (isv *intSliceValue) Set(s string) error {
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is := strings.Split(s, ",")
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var ret []int
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for _, n := range is {
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i, err := strconv.Atoi(n)
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if err != nil {
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return err
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}
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ret = append(ret, i)
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}
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*isv = intSliceValue(ret)
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return nil
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}
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// String implements the flag.Value interface.
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func (isv *intSliceValue) String() string {
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var b bytes.Buffer
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for i, n := range *isv {
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if i > 0 {
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b.WriteRune(',')
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}
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b.WriteString(strconv.Itoa(n))
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}
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return b.String()
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}
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