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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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5
internal/model/mocks/dnstransport_test.go
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@ -6,17 +6,18 @@ import (
"testing"
"github.com/ooni/probe-cli/v3/internal/atomicx"
"github.com/ooni/probe-cli/v3/internal/model"
)
func TestDNSTransport(t *testing.T) {
t.Run("RoundTrip", func(t *testing.T) {
expected := errors.New("mocked error")
txp := &DNSTransport{
MockRoundTrip: func(ctx context.Context, query []byte) ([]byte, error) {
MockRoundTrip: func(ctx context.Context, query model.DNSQuery) (model.DNSResponse, error) {
return nil, expected
},
}
resp, err := txp.RoundTrip(context.Background(), make([]byte, 16))
resp, err := txp.RoundTrip(context.Background(), &DNSQuery{})
if !errors.Is(err, expected) {
t.Fatal("not the error we expected", err)
}