This diff changes the data format to prefer "udp" to "quic" everywhere we were previously using "quic".
Previously, the code inconsistently used "quic" for operations where we knew we were using "quic" and "udp" otherwise (e.g., for generic operations like ReadFrom).
While it would be more correct to say that a specific HTTP request used "quic" rather than "udp", using "udp" consistently allows one to see how distinct events such as ReadFrom and an handshake all refer to the same address, port, and protocol triple. Therefore, this change makes it easier to programmatically unpack a single measurement and create endpoint stats.
Before implementing this change, I discussed the problem with @hellais who mentioned that ooni/data is not currently using the "quic" string anywhere. I know that ooni/pipeline also doesn't rely on this string. The only users of this feature have been research-oriented experiments such as urlgetter, for which such a change would actually be acceptable.
See https://github.com/ooni/probe/issues/2238 and https://github.com/ooni/spec/pull/262.
The T0 field is the moment when we started collecting data, while T
is the moment when we finished collecting data.
The TransactionID field will be repurposed for step-by-step measurements
to indicate related observations collected as part of the same flow
(e.g., TCP+TLS+HTTP).
Note that, for now, this change will only affect measurexlite and we're
not planning on changing other libraries for measuring.
Part of https://github.com/ooni/probe/issues/2137
* upgrade to our go.mod enabled of psiphon-tunnel-core such that
we're now using v2.0.24 of the tunnel-core;
* upgrade to the latest lucas-clemente/quic-go release;
* upgrade to the latest ooni/oohttp release (which is based on go1.19
but the diff seems good enough to continue using go1.18.x as well);
* upgrade to the latest ooni/oocrypto release (for which we can make the
same remarks regarding using go1.18.x);
* deal with changes in lucas-clemente/quic-go API as well as changes
in what a go1.19 *tls.Conn compatible type should look like.
Unfortunately, we cannot switch to go1.19 because psiphon forks quic-go
and their fork's still not building using such a version of go.
Part of ooni/probe#2211.
