File: flag.go

package info (click to toggle)
golang-github-minio-cli 1.3.0+git20170313.0.8683fa7-1
  • links: PTS, VCS
  • area: main
  • in suites: sid
  • size: 580 kB
  • ctags: 805
  • sloc: python: 241; sh: 10; makefile: 2
file content (261 lines) | stat: -rw-r--r-- 7,485 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
package altsrc

import (
	"fmt"
	"strconv"
	"strings"
	"syscall"

	"github.com/urfave/cli"
)

// FlagInputSourceExtension is an extension interface of cli.Flag that
// allows a value to be set on the existing parsed flags.
type FlagInputSourceExtension interface {
	cli.Flag
	ApplyInputSourceValue(context *cli.Context, isc InputSourceContext) error
}

// ApplyInputSourceValues iterates over all provided flags and
// executes ApplyInputSourceValue on flags implementing the
// FlagInputSourceExtension interface to initialize these flags
// to an alternate input source.
func ApplyInputSourceValues(context *cli.Context, inputSourceContext InputSourceContext, flags []cli.Flag) error {
	for _, f := range flags {
		inputSourceExtendedFlag, isType := f.(FlagInputSourceExtension)
		if isType {
			err := inputSourceExtendedFlag.ApplyInputSourceValue(context, inputSourceContext)
			if err != nil {
				return err
			}
		}
	}

	return nil
}

// InitInputSource is used to to setup an InputSourceContext on a cli.Command Before method. It will create a new
// input source based on the func provided. If there is no error it will then apply the new input source to any flags
// that are supported by the input source
func InitInputSource(flags []cli.Flag, createInputSource func() (InputSourceContext, error)) cli.BeforeFunc {
	return func(context *cli.Context) error {
		inputSource, err := createInputSource()
		if err != nil {
			return fmt.Errorf("Unable to create input source: inner error: \n'%v'", err.Error())
		}

		return ApplyInputSourceValues(context, inputSource, flags)
	}
}

// InitInputSourceWithContext is used to to setup an InputSourceContext on a cli.Command Before method. It will create a new
// input source based on the func provided with potentially using existing cli.Context values to initialize itself. If there is
// no error it will then apply the new input source to any flags that are supported by the input source
func InitInputSourceWithContext(flags []cli.Flag, createInputSource func(context *cli.Context) (InputSourceContext, error)) cli.BeforeFunc {
	return func(context *cli.Context) error {
		inputSource, err := createInputSource(context)
		if err != nil {
			return fmt.Errorf("Unable to create input source with context: inner error: \n'%v'", err.Error())
		}

		return ApplyInputSourceValues(context, inputSource, flags)
	}
}

// ApplyInputSourceValue applies a generic value to the flagSet if required
func (f *GenericFlag) ApplyInputSourceValue(context *cli.Context, isc InputSourceContext) error {
	if f.set != nil {
		if !context.IsSet(f.Name) && !isEnvVarSet(f.EnvVar) {
			value, err := isc.Generic(f.GenericFlag.Name)
			if err != nil {
				return err
			}
			if value != nil {
				eachName(f.Name, func(name string) {
					f.set.Set(f.Name, value.String())
				})
			}
		}
	}

	return nil
}

// ApplyInputSourceValue applies a StringSlice value to the flagSet if required
func (f *StringSliceFlag) ApplyInputSourceValue(context *cli.Context, isc InputSourceContext) error {
	if f.set != nil {
		if !context.IsSet(f.Name) && !isEnvVarSet(f.EnvVar) {
			value, err := isc.StringSlice(f.StringSliceFlag.Name)
			if err != nil {
				return err
			}
			if value != nil {
				var sliceValue cli.StringSlice = value
				eachName(f.Name, func(name string) {
					underlyingFlag := f.set.Lookup(f.Name)
					if underlyingFlag != nil {
						underlyingFlag.Value = &sliceValue
					}
				})
			}
		}
	}
	return nil
}

// ApplyInputSourceValue applies a IntSlice value if required
func (f *IntSliceFlag) ApplyInputSourceValue(context *cli.Context, isc InputSourceContext) error {
	if f.set != nil {
		if !context.IsSet(f.Name) && !isEnvVarSet(f.EnvVar) {
			value, err := isc.IntSlice(f.IntSliceFlag.Name)
			if err != nil {
				return err
			}
			if value != nil {
				var sliceValue cli.IntSlice = value
				eachName(f.Name, func(name string) {
					underlyingFlag := f.set.Lookup(f.Name)
					if underlyingFlag != nil {
						underlyingFlag.Value = &sliceValue
					}
				})
			}
		}
	}
	return nil
}

// ApplyInputSourceValue applies a Bool value to the flagSet if required
func (f *BoolFlag) ApplyInputSourceValue(context *cli.Context, isc InputSourceContext) error {
	if f.set != nil {
		if !context.IsSet(f.Name) && !isEnvVarSet(f.EnvVar) {
			value, err := isc.Bool(f.BoolFlag.Name)
			if err != nil {
				return err
			}
			if value {
				eachName(f.Name, func(name string) {
					f.set.Set(f.Name, strconv.FormatBool(value))
				})
			}
		}
	}
	return nil
}

// ApplyInputSourceValue applies a BoolT value to the flagSet if required
func (f *BoolTFlag) ApplyInputSourceValue(context *cli.Context, isc InputSourceContext) error {
	if f.set != nil {
		if !context.IsSet(f.Name) && !isEnvVarSet(f.EnvVar) {
			value, err := isc.BoolT(f.BoolTFlag.Name)
			if err != nil {
				return err
			}
			if !value {
				eachName(f.Name, func(name string) {
					f.set.Set(f.Name, strconv.FormatBool(value))
				})
			}
		}
	}
	return nil
}

// ApplyInputSourceValue applies a String value to the flagSet if required
func (f *StringFlag) ApplyInputSourceValue(context *cli.Context, isc InputSourceContext) error {
	if f.set != nil {
		if !(context.IsSet(f.Name) || isEnvVarSet(f.EnvVar)) {
			value, err := isc.String(f.StringFlag.Name)
			if err != nil {
				return err
			}
			if value != "" {
				eachName(f.Name, func(name string) {
					f.set.Set(f.Name, value)
				})
			}
		}
	}
	return nil
}

// ApplyInputSourceValue applies a int value to the flagSet if required
func (f *IntFlag) ApplyInputSourceValue(context *cli.Context, isc InputSourceContext) error {
	if f.set != nil {
		if !(context.IsSet(f.Name) || isEnvVarSet(f.EnvVar)) {
			value, err := isc.Int(f.IntFlag.Name)
			if err != nil {
				return err
			}
			if value > 0 {
				eachName(f.Name, func(name string) {
					f.set.Set(f.Name, strconv.FormatInt(int64(value), 10))
				})
			}
		}
	}
	return nil
}

// ApplyInputSourceValue applies a Duration value to the flagSet if required
func (f *DurationFlag) ApplyInputSourceValue(context *cli.Context, isc InputSourceContext) error {
	if f.set != nil {
		if !(context.IsSet(f.Name) || isEnvVarSet(f.EnvVar)) {
			value, err := isc.Duration(f.DurationFlag.Name)
			if err != nil {
				return err
			}
			if value > 0 {
				eachName(f.Name, func(name string) {
					f.set.Set(f.Name, value.String())
				})
			}
		}
	}
	return nil
}

// ApplyInputSourceValue applies a Float64 value to the flagSet if required
func (f *Float64Flag) ApplyInputSourceValue(context *cli.Context, isc InputSourceContext) error {
	if f.set != nil {
		if !(context.IsSet(f.Name) || isEnvVarSet(f.EnvVar)) {
			value, err := isc.Float64(f.Float64Flag.Name)
			if err != nil {
				return err
			}
			if value > 0 {
				floatStr := float64ToString(value)
				eachName(f.Name, func(name string) {
					f.set.Set(f.Name, floatStr)
				})
			}
		}
	}
	return nil
}

func isEnvVarSet(envVars string) bool {
	for _, envVar := range strings.Split(envVars, ",") {
		envVar = strings.TrimSpace(envVar)
		if _, ok := syscall.Getenv(envVar); ok {
			// TODO: Can't use this for bools as
			// set means that it was true or false based on
			// Bool flag type, should work for other types
			return true
		}
	}

	return false
}

func float64ToString(f float64) string {
	return fmt.Sprintf("%v", f)
}

func eachName(longName string, fn func(string)) {
	parts := strings.Split(longName, ",")
	for _, name := range parts {
		name = strings.Trim(name, " ")
		fn(name)
	}
}