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refactor: DNSTransport I/Os DNS messages (#760)

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This diff refactors the DNSTransport model to receive in input a DNSQuery and return in output a DNSResponse.

The design of DNSQuery and DNSResponse takes into account the use case of a transport using getaddrinfo, meaning that we don't need to serialize and deserialize messages when using getaddrinfo.

The current codebase does not use a getaddrinfo transport, but I wrote one such a transport in the Websteps Winter 2021 prototype (https://github.com/bassosimone/websteps-illustrated/).

The design conversation that lead to producing this diff is https://github.com/ooni/probe/issues/2099
This commit is contained in:
Simone Basso 2022-05-25 17:03:58 +02:00 • committed by GitHub
commit 01a513a496
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35 changed files with 1694 additions and 1039 deletions
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2
internal/engine/netx/netx.go
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@ -317,7 +317,7 @@ func NewDNSClientWithOverrides(config Config, URL, hostOverride, SNIOverride,
if err != nil {
return nil, err
}
var txp model.DNSTransport = netxlite.NewDNSOverTLS(
var txp model.DNSTransport = netxlite.NewDNSOverTLSTransport(
tlsDialer.DialTLSContext, endpoint)
if config.ResolveSaver != nil {
txp = resolver.SaverDNSTransport{