[#877] neofs-node/config: allow to provide default values

In case we have multiple sections with similar structure (e.g. shards)
having defaults in a single place is easier to work with.

Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
This commit is contained in:
Evgenii Stratonikov 2021-10-18 16:36:56 +03:00 committed by Alex Vanin
parent 118c3b3cfe
commit cb9bf00ceb
5 changed files with 78 additions and 4 deletions

View file

@ -15,9 +15,19 @@ func (x *Config) Sub(name string) *Config {
copy(path, x.path)
var defaultPath []string
if x.defaultPath != nil {
ln := len(x.defaultPath)
defaultPath = make([]string, ln, ln+1)
copy(defaultPath, x.defaultPath)
}
copy(path, x.path)
return &Config{
v: x.v,
path: append(path, name),
v: x.v,
path: append(path, name),
defaultPath: append(defaultPath, name),
}
}
@ -30,5 +40,18 @@ func (x *Config) Sub(name string) *Config {
//
// Returns nil if config is nil.
func (x *Config) Value(name string) interface{} {
return x.v.Get(strings.Join(append(x.path, name), separator))
value := x.v.Get(strings.Join(append(x.path, name), separator))
if value != nil || x.defaultPath == nil {
return value
}
return x.v.Get(strings.Join(append(x.defaultPath, name), separator))
}
// SetDefault sets fallback config for missing values.
//
// It supports only one level of nesting and is intended to be used
// to provide default values.
func (x *Config) SetDefault(from *Config) {
x.defaultPath = make([]string, len(from.path))
copy(x.defaultPath, from.path)
}

View file

@ -60,3 +60,20 @@ func TestConfig_SubValue(t *testing.T) {
require.Equal(t, "val1", sub.Value("key"))
})
}
func TestConfig_SetDefault(t *testing.T) {
configtest.ForEachFileType("test/config", func(c *config.Config) {
c = c.Sub("with_default")
s := c.Sub("custom")
s.SetDefault(c.Sub("default"))
require.Equal(t, int64(42), config.Int(s, "missing"))
require.Equal(t, "b", config.String(s, "overridden"))
require.Equal(t, false, config.Bool(s, "overridden_with_default"))
// Default can be set only once.
s = s.Sub("sub")
require.Equal(t, int64(123), config.Int(s, "missing"))
require.Equal(t, "y", config.String(s, "overridden"))
})
}

View file

@ -17,7 +17,8 @@ import (
type Config struct {
v *viper.Viper
path []string
defaultPath []string
path []string
}
const separator = "."

View file

@ -56,5 +56,24 @@
"size_tb": "5 TB",
"size_bytes": "2048b",
"size_bytes_no_suffix": 123456
},
"with_default": {
"default": {
"sub": {
"missing": 123,
"overridden": "x"
},
"missing": 42,
"overridden": "a",
"overridden_with_default": true
},
"custom": {
"sub": {
"overridden": "y"
},
"overridden": "b",
"overridden_with_default": false
}
}
}

View file

@ -49,3 +49,17 @@ sizes:
size_tb: 5 TB
size_bytes: 2048b
size_bytes_no_suffix: 123456
with_default:
default:
sub:
missing: 123
overridden: "x"
missing: 42
overridden: "a"
overridden_with_default: true
custom:
sub:
overridden: "y"
overridden: "b"
overridden_with_default: false