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This makes it a little easier to drop unwanted capabilities.
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(For now, the su capability doesn't actually do anything,
and there is no ability to actually have a session start with one.)
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First, run
```
git grep -l "^edition =" |
xargs perl -i -pe 's/^edition *=.*/edition = "2024"/;'
```
Second, manually verify that all Cargo.toml files have changed,
and nothing else has changed.
Third, run cargo fmt again.
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They used to be deduplicated, but they haven't been for a while.
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These will have different implementations soon; this is a more
logical place for them.
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I'm about to remove HasKind from InvokeError, which would otherwise
break this code.
These errors are all in fact internal errors, since in this context
they can only stem from incorrectly formed calls to
`invoke_special_method`.
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Based on review from @opara.
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Previous documentation was more-or-less meant for the Arti developer
only. This new documentation is intended for actual users of RPC
functionality. It's meant to be extracted with `maint/rpc-doc-tool`.
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Calling it "singleton" might have suggested that it was using the
[singleton pattern](https://en.wikipedia.org/wiki/Singleton_pattern),
which it isn't.
(Renaming done with rust-analyzer and double-checked with `git grep`.)
Closes #1585.
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(This will either become used later, or we will remove it;
the TODO RPC will remind us.)
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It is no longer necessary to say, for every RPC method,
that its error type is RpcError.
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On its own, this might not seem like a huge improvement, but it will
later let us implement these RPC methods for types that can't
reasonably implement ClientConnectionTarget.
It also serves as a proof of concept that special-method invocation
can actually work, so that we can build things like this in cases
where introducing a trait isn't practical.
Closes #1427
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Formerly we used a Box. That was okay at first, but now that we
want RPC methods to be able to invoke other RPC methods, we don't
want the Invocable methods to have to consume the Context.
This requires that Context become Sync.
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This is needed so that we can cast special methods' return types
properly.
I wish I could make this optional, but Rust doesn't allow
defaulting an associated type.
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Specifically, we want a single colon, and we want our
method names to be in snake_case.
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(These will later become objects that can receive any application
request, once we have HTTP connect.)
For now, Session and TorClient implement this trait;
but soon there will be a new type to hold on to the created
DataStreamCtrl.
There are some XXXXs here, marking code that is too ugly to live.
I should fix it before I merge this branch.
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Instead, add a trait so that we can hold TorClient<R> and invoke
only the methods on it that we need.
This is a partial revert of 47f012829d3381fd896c6b6f20961fbfe2f40f6d.
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This change allows it to hold a TorClient<R> that isn't type-erased.
We'll use this for cases when we need to get the client directly
and call functions on it.
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These are no longer needed, since they are inferred from the types
of the functions.
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This will be called _static_ to make it clear that it registers the
method statically, so you don't need to install it at runtime.
After a bit more work, there will be a separate macro that declares
an installer function.
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We don't actually need this to be a trait; we just need
methods and objects to have a `CONST_TYPE_ID_` if they want to
participate in the inventory-based method registry.
Removing this trait makes it much simpler to declare methods and
objects.
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This simplifies our implementation logic in a few places,
and simplifies our invocation syntax greatly. There are a few
infelicities, noted in `TODO RPC` comments.
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Formerly, every time we wanted to launch a new connection, we had
to give the RpcMgr a TorClient. The connection would hold that
TorClient until a session was authenticated, and then would wrap
it in a Session and put it in the object map.
Now, the RpcMgr holds a Box<dyn Fn()...> that knows how to
create Sessions. When a connection is authenticated, it
asks the Mgr to make it a new session. This lets us make it
clearer that the TorClient simply can't be given out until the
connection is authenticated. Later, it will let us create
more types of Session objects under more complicated rules.
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We'll want to move the responsibility for creating Sessions outside
the rpcmgr crate.
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This is a rather tricky piece of functionality. It works as
follows.
We introduce a `CastTable` type. Each `CastTable` tells us how to
downcast `dyn Object` for objects of a single concrete type.
The `Object` type now has a `get_casttable` method that returns
an empty `CastTable` by default.
`CastTable` is, internally, a map from the `TypeId` of the target
dyn Trait reference type to a function
`fn(&dyn Object) -> &dyn Trait`. These functions are stored as
`Box<dyn Any + ...>`. (They are Boxed because they may refer to
generic functions, which you can't get a static reference to,
and they're Any because the functions have different types.)
The `decl_object!` macro now implements `get_casttable` as
appropriate. (The syntax is a bit janky, but that's what we get
for not using derive_adhoc.) For non-generic types, `get_casttable`
uses a Lazy<CastTable>`. to initialize a CastTable exactly once.
For generic types, it use a `Lazy<RwLock<HashMap<..>>` to
build one CastTable per instantiation of the generic type.
This could probably be optimized a bit more, the yaks could be
shaved in a more scintillating hairstyle, and the syntax for
generic `decl_object` could definitely be improved.
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Rationale: Our weak-vs-strong design is a bit confused at the moment
due to concerns about deduplication and capability semantics. It's
not clear that a general "change strong to weak" method is
compatible with what we want to provide.
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I've made doing some design choices here:
* Reserving "rpc" as a prefix for post-authentication
functionality that is not arti-specific.
* Declaring these to be methods on the session rather than methods
on the objects themselves.
There's a problem with defining an API to drop a weak reference; see
comment in code.
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This will make it easier to change the semantics of what exactly we
return, whether it has to be/contain a client, whether you can use
it to look up all the live objects, &etc.
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To me, "Session" suggests that we're authenticated, when we are
not necessarily authenticated. Also, we may eventually want to have
some kind of persistent session object; if we do, then we'll want
Connections to be separate.
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(This is the correct capabilities-based behavior. For now it will only
work if the TorClient uses a PreferredRuntime, but with luck we will
find a solution for #837 soon.)
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Now there's a module in `arti` that runs the loop for an RPC
listener. The part of the old `listener` module that made
the framed connections is now part of the `Session` object.
There is now yet another a temporary location for the pipe; we
should pick something better. At least now it's configurable.
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In the future, this will probably hold more data as well, like a
TorClient and some configuration info.
The TorClient will present an issue; I've made comments about that.
Closes #820
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