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example_value_test.go
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// Copyright (c) 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package config_test
import (
"fmt"
"log"
"go.uber.org/config"
)
func ExampleValue_Populate() {
p, err := config.NewStaticProvider(map[string]interface{}{
"example": map[string]interface{}{
"name": "uber",
"founded": 2009,
},
})
if err != nil {
log.Fatal(err)
}
var c struct {
Name string
Founded int
}
if err := p.Get("example").Populate(&c); err != nil {
log.Fatal(err)
}
fmt.Println(c)
// Output:
// {uber 2009}
}
func ExampleValue_Populate_slice() {
p, err := config.NewYAMLProviderFromBytes([]byte(`
slice:
- 1
- 2
- 3
`))
if err != nil {
log.Fatal(err)
}
var s []int
if err := p.Get("slice").Populate(&s); err != nil {
log.Fatal(err)
}
fmt.Println(s)
// Output:
// [1 2 3]
}
func ExampleValue_Populate_error() {
p, err := config.NewYAMLProviderFromBytes([]byte(`
bool: notBool
`))
if err != nil {
log.Fatal(err)
}
var b bool
fmt.Println(p.Get("bool").Populate(&b))
// Output:
// for key "bool": strconv.ParseBool: parsing "notBool": invalid syntax
}
func ExampleValue_WithDefault() {
p, err := config.NewYAMLProviderFromBytes([]byte(`
example:
override: fromYAML
`))
if err != nil {
log.Fatal(err)
}
type example struct {
Base string
Override string
}
d := example{Override: "default", Base: "default"}
fmt.Printf("Default value:\n%+v\n", d)
v, err := p.Get("example").WithDefault(d)
if err != nil {
log.Fatal(err)
}
if err := v.Populate(&d); err != nil {
log.Fatal(err)
}
fmt.Printf("Populate:\n%+v\n", d)
// Output:
// Default value:
// {Base:default Override:default}
// Populate:
// {Base:default Override:fromYAML}
}