The new `BootstrapBehavior` enum controls whether an unbootstrapped
`TorClient` will bootstrap itself automatically (`Ondemand`) when an
attempt is made to use it, or whether the user must perform
bootstrapping themselves (`Manual`).
The `lazy-init` example shows how you could write a simple
`get_tor_client()` function that used a global `OnceCell` to share
a Tor client across an entire application with this API.
closes arti#278
Adding this autoconversion is quite safe since every error generation
site is explicit and has its own context, and we don't really need to
add more.
This simplifies the code and will simplify future work.
This error type doesn't impement HasKind, since the kind will depend
on context.
However, the existing implementation was pretty messy and inconsistent:
Some errors had positions, some didn't.
Some took messages as str, some as String.
Some had internal errors that were somewhat orthogonal to their actual
types.
This commit refactors tor_netdoc::Error to use a ParseErrorKind, and
adds a set of convenience functions to add positions and
messages to the errors that need them.
We should not generally explicitly specify a kind for errors which
contain a more detailed error which itself has a kind. Stating the
kind literally is a latent bug, which becomes a real bug if the
contained type's kind changes or starts to vary.
(There may be exceptions to this principle but this isn't one of
them.)
Since the only purpose of this function is to make sure that no
bootstrapping task is running, a simple futures:🔒:Mutex
should do the job just fine.
Closes#337.
This commit changes how the `TorClient` type works, enabling it to be
constructed synchronously without initiating the bootstrapping process.
Daemon tasks are still started on construction (although some of them
won't do anything if the client isn't bootstrapped).
The old bootstrap() methods are now reimplemented in terms of the new
create_unbootstrapped() and bootstrap_existing() methods.
This required refactoring how the `DirMgr` works to enable the same sort
of thing there.
closes#293
Refactor the Error type to remove the yucky internal hidden Truncated
variant. Instead, there's now an embedded tor_bytes::Error value.
If that tor_bytes::Error is Truncated, we bubble it up when we convert our
handshake result to the nested error struct.
Thus there is still (sadly) a variant of tor_socksproto::Error
that shouldn't be exposed to user code. But refactoring every
inner method under handshake.rs seemed like a bad idea: once we're using
Result<Result<..>>, the ? operator no longer helps us much.
eta
Nick Mathewson
Ian Jackson
Ian Jackson
Dimitris Apostolou