/
config.go
144 lines (114 loc) · 2.58 KB
/
config.go
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package main
import (
"fmt"
"net/url"
"os"
"regexp"
multierror "github.com/hashicorp/go-multierror"
yaml "gopkg.in/yaml.v3"
)
// Config is a validated configuration.
type Config struct {
DefaultRoute *Proxy
Routes []Route
}
// RawConfig if as configuration is stored in the yaml file.
type RawConfig struct {
DefaultRoute *RawProxy `yaml:"defaultProxy"`
Routes []RawRoute `yaml:"routes"`
}
func (r RawConfig) Validate() (c Config, err error) {
var merr *multierror.Error
if r.DefaultRoute != nil {
defaultRoute, drerr := r.DefaultRoute.Validate()
c.DefaultRoute = &defaultRoute
merr = multierror.Append(nil, drerr)
}
for _, route := range r.Routes {
parsedRoute, err := route.Validate()
merr = multierror.Append(merr, err)
c.Routes = append(c.Routes, parsedRoute)
}
err = merr.ErrorOrNil()
return
}
type Route interface {
Matches(connectstr string) bool
Proxy() Proxy
}
type proxyRoute struct {
proxy Proxy
}
func (p proxyRoute) Proxy() Proxy {
return p.proxy
}
type fixedRoute struct {
proxyRoute
connectstr string
}
func (r fixedRoute) Matches(connectstr string) bool {
return connectstr == r.connectstr
}
func newFixedRoute(route RawRoute) (cr Route, err error) {
var c fixedRoute
proxy, err := route.Proxy.Validate()
c.proxyRoute = proxyRoute{proxy}
c.connectstr = route.Pattern
cr = c
return
}
type regexpRoute struct {
proxyRoute
pattern *regexp.Regexp
}
func (r regexpRoute) Matches(connectstr string) bool {
return r.pattern.MatchString(connectstr)
}
func newRegexpRoute(route RawRoute) (cr Route, err error) {
var c regexpRoute
proxy, err := route.Proxy.Validate()
if err != nil {
return
}
c.proxyRoute = proxyRoute{proxy}
c.pattern, err = regexp.Compile(route.Pattern)
cr = c
return
}
var typeByString = map[string]func(RawRoute) (Route, error){
"exact": newFixedRoute,
"regexp": newRegexpRoute,
}
type RawRoute struct {
Type string `yaml:"type"`
Pattern string `yaml:"pattern"`
Proxy RawProxy `yaml:"proxy"`
}
func (route RawRoute) Validate() (c Route, err error) {
creator, existed := typeByString[route.Type]
if !existed {
err = fmt.Errorf("route type %s unrecognized", route.Type)
return
}
c, err = creator(route)
return
}
type Proxy struct {
Address *url.URL
}
type RawProxy struct {
Address string `yaml:"address"`
}
func (p RawProxy) Validate() (c Proxy, err error) {
u, err := url.Parse(p.Address)
c.Address = u
return
}
func readConfig(f *os.File) (conf Config, err error) {
var raw RawConfig
if err = yaml.NewDecoder(f).Decode(&raw); err != nil {
return
}
conf, err = raw.Validate()
return
}