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We need to do this so that we can actually invoke RPC functions
from one another.
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Now that Method::Error exists, we can downcast Any to the actual
function's return type.
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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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A @special invoker does not get an RPC entry.
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Now Methods can return anything; and only if their outputs are
Serialize will they implement RpcInvocable.
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RpcInvocable will only be implemented on types whose output
can be serialized.
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This is part of work on #1403.
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This will allow us to create dispatchable methods that are only
invoked from inside the arti code, and are not themselves
serializable.
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We need to do this carefully, since we want our system to be
extensible with new namespaces.
First, when we are constructing an RpcMgr, we _warn_ about any
method names that are misformed.
Second, we add a test in the `arti` crate to fail if any method
names are invalid. This will only catch method names in crates that
`arti` depends on.
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Previously we could only downcast to &dyn Trait,
which is not adequate.
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This makes `ObjectRefExt` less necessary, and will let us make it
Arc-only.
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tor-rpcbase: Use Void to eliminate a panic, as statically unreachable
See merge request tpo/core/arti!2124
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add_warning/CI: New strategy to avoid "unexpected-cfgs" warning
Closes #1395
See merge request tpo/core/arti!2129
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This commit is automatically generated.
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It no longer requires the user to have `typetag` in scope.
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As per
https://gitlab.torproject.org/tpo/core/arti/-/merge_requests/2103#note_3024372
I overlooked this.
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Previously, one of the macros was documented to accept
`(function_expr)`, but in fact it would only accept an identifier.
Now we *do* accept any expression.
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IMO if we want flags again in the future, we should probably pick a
syntax that doesn't involve such awkward patterns.
Perhaps `$expr $( , $( $flag )* )?`.
But I think we probably won't need that feature.
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This renders the Update flag redundant.
Indeed, in this commit we mow ignore the flags.
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This arm puts parens around its argument. But the other arm insists
on $func:ident, and also would capture any reasonable input.
This was probably something to do with the (func_expr) syntax. We
don't need to *fix* this macrology, because in a moment the whole
macro can be made to take $func:expr.
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Now that we've done more refactoring, it's no longer necessary to
have this machinery, since:
* We can support statically registering instantiated methods, if we
know them ahead of time.
* Writing an installer function is pretty simple, and the syntax
is much nicer than the special-purpose junk we had before.
I've added examples of both approaches.
While we're at it, I've simplified the syntax for `invoker_ent!` a
little, since the parentheses I had before aren't necessary.
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These are no longer needed, since they are inferred from the types
of the functions.
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The trick here is to provide an `Invoker` trait,
with blanket implementations for appropriate `fn(_,_,_,_?) -> _`.
With this trick, we no longer need to have a `decl_rpc_invoke_fn`.
This lets us discard HasConstTypeId entirely,
and will let us simplify some other syntax moving forward.
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Since we can't enumerate every instantiation at compile time,
we instead provide a macro to generate an _installer_ function
that installs a set of functions for a given instantiation.
Due to the limitations of macro_rules, the syntax for generics is
a bit ugly.
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Now there is an `decl_rpc_invoke_fn` macro that *only* declares the
type-erased functions. Another macro's job will be to register it.
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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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