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feat: context-based tracing to record delayed DNS responses (#870)

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See https://github.com/ooni/probe/issues/2221

Co-authored-by: decfox <decfox@github.com>
Co-authored-by: Simone Basso <bassosimone@gmail.com>
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DecFox 2022-08-22 17:51:32 +05:30 • committed by GitHub
commit 2301a30630
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10 changed files with 498 additions and 317 deletions
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23
internal/model/netx.go
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@ -340,6 +340,29 @@ type Trace interface {
OnDNSRoundTripForLookupHost(started time.Time, reso Resolver, query DNSQuery,
response DNSResponse, addrs []string, err error, finished time.Time)
// OnDelayedDNSResponse is used with a DNSOverUDPTransport and called
// when we get delayed, unexpected DNS responses.
//
// Arguments:
//
// - started is when we started reading the delayed response;
//
// - txp is the DNS transport used with the resolver;
//
// - query is the non-nil DNS query we use for the RoundTrip;
//
// - response is the non-nil valid DNS response, obtained after some delay;
//
// - addrs is the list of addresses obtained after decoding the delayed response,
// which is empty if the response did not contain any addresses, which we
// extract by calling the DecodeLookupHost method.
//
// - err is the result of DecodeLookupHost: either an error or nil;
//
// - finished is when we have read the delayed response.
OnDelayedDNSResponse(started time.Time, txp DNSTransport, query DNSQuery,
resp DNSResponse, addrs []string, err error, finsihed time.Time) error
// OnConnectDone is called when connect terminates.
//
// Arguments: