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option.go
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option.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 yarpcconfig
// Option customizes a Configurator.
type Option func(*Configurator)
// InterpolationResolver changes how interpolated variables in the
// configuration are resolved. By default, environment variables are used.
//
// Variables will be interpolated using this function if a parsed
// field inside a configuration structure was annotated with
// config:",interpolate" or config:"$name,interpolate" where $name is encoded
// name of that field.
//
// Only primitive types (numbers, strings, and time.Duration) are
// interpolated.
//
// type myConfig struct {
// Host string `config:"host,interpolate"`
// Port int `config:",interpolate"`
// Timeout time.Duration `config:",interpolate"`
// }
func InterpolationResolver(f func(k string) (v string, ok bool)) Option {
return func(c *Configurator) {
c.resolver = f
}
}