Comments (1)
Some observations:
-
You can't retroactively add protocol conformances to
xpc_object_t
(and its variants):// error: extension of protocol 'OS_xpc_object' cannot have an inheritance clause extension xpc_connection_t: Codable { }
-
You can use a property wrapper (which itself can be codable, even if its wrappedValue is not).
The only solution approaches I can think of involve wrapping the xpc_connection_t
(or xpc_endpoint_t
; I propose we make both codable). Either explicitly by the user, or implicitly via a property wrapper. I don't see any down-side to the latter over the former, so I propose we go with a property wrapper.
I see two ways we can make this work:
- "Fake" the implementation of
Codable
on the property wrapper- Make the
init(from:)
andencode(to:)
callfatalError()
.- The message should inform users that these values can only ever be encoded/decoded by the SecureXPC library.
- Add special-cases to the
XPCEncoder
/XPCDecoder
(well really, their containers), such that they intercept these values and never actually call theirinit(from:)
orencode(to:)
methods. - I haven't had time to spike this one out yet
- Make the
- Conform to
Codable
for real- Make the
init(from:)
andencode(to:)
cast theirEncoder
/Decoder
param to a concreteXPCEncoderImpl
/XPCDecoderImpl
. If the cast fails,fatalError()
out.- Again, the message should inform users that these values can only ever be encoded/decoded by the SecureXPC library.
- Make a single value container (in either case), and down cast to the
XPCSingleValueEncodingContainer
/XPCSingleValueDecodingContainer
(this is safe to force-cast) - Don't special case anything. Let the default implementation of
Codable
take its course.init(from:)
andencode(to:)
will be called like normal. - Add methods to
XPCEncoder
/XPCDecoder
(their containers) that handlexpc_connection_t
andxpc_endpoint_t
. Use these to implementinit(from:)
andencode(to:)
- I made a proof of concept of this for
xpc_connection_t
, here: #13
- Make the
from securexpc.
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from securexpc.