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The HTTP status text is often useful for diagnosing errors. Tor
directory and hsdir caches frequently put useful messages there,
especially when rejecting an uploaded document.
Inspired by #1142.
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Since not everybody has xz and/or zstd, we don't want to admit
whether we support them when we are uploading or downloading an
onion service descriptor. Similarly, if we aren't advertising
support for an encoding, we shouldn't accept it.
Finally, while we're doing this, it made sense to have the ability
to mark requests based on how anonymized they are, and reject (some)
attempts to send those requests over a one-hop circuit.
Closes #1062
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These are newly present on 1.65. We can address them later.
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We're going to have functions on Response that fail by returning only
one of these.
Sadly this diff is quite noisy.
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These errors no longer use Debug to dump the `Option<SourceInfo>`, but
instead produce reasonable text. Also, I've fixed the SourceInfo
Display implementation so that it now says that it got the error
"from $source via $circuit" rather than the other way around.
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(It makes sense to use this for things that are not in fact lists of
SHA256 digests of Microdescriptors.)
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According to doc/Errors.md, and in keeping with current best
practices, we should not include display an error's `source()` as
part of that error's display method. Instead, we should let the
caller decide to call source() and display that error in turn.
Part of #323.
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This will help implement #466.
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This commit refactors the dirclient error type into two cases:
errors when constructing a circuit, and errors that occur once we
already have a one-hop circuit. The latter can usually be
attributed to the specific cache we're talking to.
This commit also adds a function to expose the information about
which directory gave us the info.
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This is still not as specific as we want; but there's already a TODO
comment in tor-dirclient::err about fixing that at some point in the
future.
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Getting a non-200 status is no longer a failure condition; it's just
a different kind of answer.
Closes #349.
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This patch makes only minimal changes in lower-level error types:
we have more refactoring to do.
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This will cause some pain for now, but now is really the best time
to do this kind of thing.
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