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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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These are no longer needed.
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Closes #950.
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rpc: Minor docs improvements
See merge request tpo/core/arti!1260
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This will later let us tell the session-creation function
how the authentication occurred, which will let it decide
what privileges to provide.
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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 adds a Weak reference from Connection to Mgr, makes DispatchTable
mutable, and makes a few other changes as discussed between me and
Diziet the other week.
I bet we are not done tweaking this, but I hope it's a setp forwards.
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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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These identifiers are actually only "global" with respect to a given
`RpcMgr`, but they should not be forgeable or reusable across RpcMgr
objects. We're going to use them so that we have a kind of identifier
for `TorClient`s that we can expose to SOCKS.
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We're going to use this to implement arti#863, which requires that
some RPC objects be globally nameable.
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rpc: authentication and basic handle manipulation
See merge request tpo/core/arti!1200
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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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