ooni / probe-cli / 7636657350
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fix(oohelperd,netemx): construct equivalent HTTPTransports (#1464)

This diff modifies oohelperd and netemx to ensure we construct
equivalent HTTPTransports.

Let's show that this is actually the case.

Let's start from the HTTP/1.1 and HTTP2 transport.

This is what `oohelperd` does after this diff:

```Go
		NewHTTPClient: func(logger model.Logger) model.HTTPClient {
			// TODO(https://github.com/ooni/probe/issues/2534): the NewHTTPTransportWithResolver has QUIRKS and
			// we should evaluate whether we can avoid using it here
			return NewHTTPClientWithTransportFactory(
				logger,
				netxlite.NewHTTPTransportWithResolver,
			)
		},
```

This is what `netemx` does after this diff:

```Go
	handler.NewHTTPClient = func(logger model.Logger) model.HTTPClient {
		return oohelperd.NewHTTPClientWithTransportFactory(
			logger,
			func(dl model.DebugLogger, r model.Resolver) model.HTTPTransport {
				dialer := netx.NewDialerWithResolver(dl, r)
				tlsDialer := netxlite.NewTLSDialer(dialer, netx.NewTLSHandshakerStdlib(dl))
				// TODO(https://github.com/ooni/probe/issues/2534): NewHTTPTransport is QUIRKY but
				// we probably don't care about using a QUIRKY function here
				return netxlite.NewHTTPTransport(dl, dialer, tlsDialer)
			},
		)
	}
```

We're using the same (now public) `NewHTTPClientWithTransportFactory`
function. So, what remains to be done to reach a QED is to show that
this code called by `oohelperd`:

```Go
			return NewHTTPClientWithTransportFactory(
				logger,
				netxlite.NewHTTPTransportWithResolver,
			)
```

is equivalent to this code called by `netemx`:

```Go
			func(dl model.DebugLogger, r model.Resolver) model.HTTPTransport {
				dialer := netx.NewDialerWithResolver(dl, r)
				tlsDialer := netxlite.NewTLSDialer(dialer, netx.NewTLSHandshakerStdlib(dl))
				// TODO(https://github.com/ooni/probe/issues/2534): NewHTTPTransport is QUIRKY but
				// we probably don't care about usi... (continued)

25208 of 30941 relevant lines covered (81.47%)

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