options.go

package cfggo

import (
	"net/http"
	"os"
)

// Option is a function that configures a Structure
type Option func(*Structure) error

// WithName sets the name of the configuration
func WithName(name string) Option {
	return func(c *Structure) error {
		c.name = name
		return nil
	}
}

// WithFileConfig sets the config source/dest to a filename
func WithFileConfig(filename string) Option {
	if _, err := os.Stat(filename); os.IsNotExist(err) {
		Logger.Warn("filename %s does not exist", filename)
	}
	return func(c *Structure) error {
		if c.configHandler != nil {
			return ErrorWrapper(nil, 400, "configHandler is already set, ignoring WithFileConfig")
		}
		handler := &handlerFile{filename: filename}
		c.configHandler = handler
		return nil
	}
}

// WithHTTPConfig sets the config source/dest to a filename
func WithHTTPConfig(httpLoader *http.Request, httpSaver *http.Request) Option {
	if httpLoader == nil && httpSaver == nil {
		return func(c *Structure) error {
			return ErrorWrapper(nil, 400, "httpLoader and httpSaver cannot both be nil")
		}
	}
	return func(c *Structure) error {
		if c.configHandler != nil {
			return ErrorWrapper(nil, 400, "configHandler is already set, ignoring WithHTTPConfig")
		}
		handler := &handlerHTTP{}
		if httpLoader != nil {
			handler.source = *httpLoader
		}
		if httpSaver != nil {
			handler.dest = *httpSaver
		}
		c.configHandler = handler
		return nil
	}
}

// WithSkipEnvironment skips loading from environment variables
func WithSkipEnvironment() Option {
	return func(c *Structure) error {
		// Logger.Debug("Skipping environment variables")
		c.skipEnv = true
		return nil
	}
}