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cleanup: move caching resolvers from netx to netxlite (#799)

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Now that we have properly refactored the caching resolvers we can
move them into netxlite as optional resolvers created using the
proper abstract factories we just added.

This diff reduces the complexity and the code size of netx.

See https://github.com/ooni/probe/issues/2121.
This commit is contained in:
Simone Basso 2022-06-05 21:58:34 +02:00 • committed by GitHub
commit 5d54aa9c5f
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5 changed files with 34 additions and 36 deletions
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34
internal/netxlite/bogon.go
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@ -3,7 +3,8 @@ package netxlite
//
// Bogon
//
// This file helps us to decide if an IPAddr is a bogon.
// This file helps us to decide if an IPAddr is a bogon as well as
// a way to create a resolver that fails when resolving bogons.
//
import (
@ -17,29 +18,28 @@ import (
// MaybeWrapWithBogonResolver wraps the given resolver with a BogonResolver
// iff the provided boolean flag is true. Otherwise, this factory just returns
// the provided resolver to the caller without any wrapping.
//
// The returned resolver returns a wrapped ErrDNSBogon if there's a bogon error.
//
// BUG: This resolver currently only implements LookupHost. All the other
// lookup methods will always return ErrNoDNSTransport.
func MaybeWrapWithBogonResolver(enabled bool, reso model.Resolver) model.Resolver {
if enabled {
reso = &BogonResolver{Resolver: reso}
reso = &bogonResolver{Resolver: reso}
}
return reso
}
// BogonResolver is a bogon aware resolver. When a bogon is encountered in
// bogonResolver is a bogon aware resolver. When a bogon is encountered in
// a reply, this resolver will return ErrDNSBogon.
//
// This resolver is not part of the default chain created by WrapResolver
// therefore it returns errors that have already been wrapped.
//
// BUG: This resolver currently only implements LookupHost. All the other
// lookup methods will always return ErrNoDNSTransport.
type BogonResolver struct {
type bogonResolver struct {
Resolver model.Resolver
}
var _ model.Resolver = &BogonResolver{}
var _ model.Resolver = &bogonResolver{}
// LookupHost implements Resolver.LookupHost
func (r *BogonResolver) LookupHost(ctx context.Context, hostname string) ([]string, error) {
func (r *bogonResolver) LookupHost(ctx context.Context, hostname string) ([]string, error) {
addrs, err := r.Resolver.LookupHost(ctx, hostname)
if err != nil {
return nil, err // not our responsibility to wrap this error
@ -54,29 +54,29 @@ func (r *BogonResolver) LookupHost(ctx context.Context, hostname string) ([]stri
}
// LookupHTTPS implements Resolver.LookupHTTPS
func (r *BogonResolver) LookupHTTPS(ctx context.Context, hostname string) (*model.HTTPSSvc, error) {
func (r *bogonResolver) LookupHTTPS(ctx context.Context, hostname string) (*model.HTTPSSvc, error) {
// TODO(bassosimone): decide whether we want to implement this method or not
return nil, ErrNoDNSTransport
}
// LookupNS implements Resolver.LookupNS
func (r *BogonResolver) LookupNS(ctx context.Context, hostname string) ([]*net.NS, error) {
func (r *bogonResolver) LookupNS(ctx context.Context, hostname string) ([]*net.NS, error) {
// TODO(bassosimone): decide whether we want to implement this method or not
return nil, ErrNoDNSTransport
}
// Network implements Resolver.Network
func (r *BogonResolver) Network() string {
func (r *bogonResolver) Network() string {
return r.Resolver.Network()
}
// Address implements Resolver.Address
func (r *BogonResolver) Address() string {
func (r *bogonResolver) Address() string {
return r.Resolver.Address()
}
// CloseIdleConnections implements Resolver.CloseIdleConnections
func (r *BogonResolver) CloseIdleConnections() {
func (r *bogonResolver) CloseIdleConnections() {
r.Resolver.CloseIdleConnections()
}