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feat(netxlite): implement DNSTransport wrapping (#776)

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Acknowledge that transports MAY be used in isolation (i.e., outside
of a Resolver) and add support for wrapping.

Ensure that every factory that creates an unwrapped type is named
accordingly to hopefully ensure there are no surprises.

Implement DNSTransport wrapping and use a technique similar to the
one used by Dialer to customize the DNSTransport while constructing
more complex data types (e.g., a specific resolver).

Ensure that the stdlib resolver's own "getaddrinfo" transport (1)
is wrapped and (2) could be extended during construction.

This work is part of my ongoing effort to bring to this repository
websteps-illustrated changes relative to netxlite.

Ref issue: https://github.com/ooni/probe/issues/2096
This commit is contained in:
Simone Basso 2022-06-01 11:10:08 +02:00 • committed by GitHub
commit 8f7e3803eb
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20 changed files with 369 additions and 91 deletions
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13
internal/netxlite/dnsoverhttps.go
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@ -31,20 +31,21 @@ type DNSOverHTTPSTransport struct {
HostOverride string
}
// NewDNSOverHTTPSTransport creates a new DNSOverHTTPSTransport instance.
// NewUnwrappedDNSOverHTTPSTransport creates a new DNSOverHTTPSTransport
// instance that has not been wrapped yet.
//
// Arguments:
//
// - client is a model.HTTPClient type;
//
// - URL is the DoH resolver URL (e.g., https://dns.google/dns-query).
func NewDNSOverHTTPSTransport(client model.HTTPClient, URL string) *DNSOverHTTPSTransport {
return NewDNSOverHTTPSTransportWithHostOverride(client, URL, "")
func NewUnwrappedDNSOverHTTPSTransport(client model.HTTPClient, URL string) *DNSOverHTTPSTransport {
return NewUnwrappedDNSOverHTTPSTransportWithHostOverride(client, URL, "")
}
// NewDNSOverHTTPSTransportWithHostOverride creates a new DNSOverHTTPSTransport
// with the given Host header override.
func NewDNSOverHTTPSTransportWithHostOverride(
// NewUnwrappedDNSOverHTTPSTransportWithHostOverride creates a new DNSOverHTTPSTransport
// with the given Host header override. This instance has not been wrapped yet.
func NewUnwrappedDNSOverHTTPSTransportWithHostOverride(
client model.HTTPClient, URL, hostOverride string) *DNSOverHTTPSTransport {
return &DNSOverHTTPSTransport{
Client: client,