/
flags.go
105 lines (79 loc) · 2.27 KB
/
flags.go
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
package config
import (
"errors"
"fmt"
"strings"
"github.com/knadh/koanf/providers/structs"
"github.com/spf13/pflag"
)
func createFlags(fields []ConfigOption) (*pflag.FlagSet, map[string]string, error) {
fs := pflag.NewFlagSet("b7s-node", pflag.ExitOnError)
fs.SortFlags = false
for _, field := range fields {
err := addFlag(fs, field.CLI)
if err != nil {
return nil, nil, fmt.Errorf("could not add flag for config (name: %v, flag: %v, type: %v)", field.FullPath, field.CLI.Flag, field.kind.String())
}
}
mapping, err := mapCLIFlagsToConfig(fields)
if err != nil {
return nil, nil, fmt.Errorf("could not get mapping of CLI flags to config: %w", err)
}
return fs, mapping, nil
}
func addFlag(fs *pflag.FlagSet, fc CLIFlag) error {
if fc.Flag == "" {
return nil
}
switch def := fc.Default.(type) {
case uint:
fs.UintP(fc.Flag, fc.Shorthand, def, fc.Description)
case string:
fs.StringP(fc.Flag, fc.Shorthand, def, fc.Description)
case float64:
fs.Float64P(fc.Flag, fc.Shorthand, def, fc.Description)
case int64:
fs.Int64P(fc.Flag, fc.Shorthand, def, fc.Description)
case bool:
fs.BoolP(fc.Flag, fc.Shorthand, def, fc.Description)
case []string:
fs.StringSliceP(fc.Flag, fc.Shorthand, nil, fc.Description)
default:
return errors.New("unsupported type for a CLI flag. Extend support by adding handling for the new flag type")
}
return nil
}
func getFlagFromTag(tag string) (string, string) {
tag = strings.TrimSpace(tag)
fields := strings.Split(tag, ",")
switch len(fields) {
case 0:
return "", ""
case 1:
return fields[0], ""
default:
return fields[0], fields[1]
}
}
// return mapping of CLI flag to the config path used by koanf. E.g. address => connectivity.address.
// We don't have to enfore uniqueness of CLI flags as pflag does that for us.
func mapCLIFlagsToConfig(fields []ConfigOption) (map[string]string, error) {
flags := make(map[string]string)
for _, field := range fields {
if field.CLI.Flag == "" {
continue
}
flags[field.CLI.Flag] = field.FullPath
}
return flags, nil
}
func getDefaultFlagValues() map[string]any {
cfg := structs.Provider(DefaultConfig, "koanf")
defaults, err := cfg.Read()
if err != nil {
return nil
}
flat := make(map[string]any)
flattenMap("", defaults, flat)
return flat
}