The existing configuration was partially compatible with Ricochet's,
but not enough to actually be useful. It also required a bunch of
boilerplate code to copy data between configuration data structures,
internal data structures, and RPC data structures.
Protobuf conveniently supports encoding messages to JSON, and we already
need to store most data (e.g. contacts) in protobuf structures. This
commit changes the configuration to be a protobuf JSON serialization of
the Config message, which can directly reuse RPC messages like Contact.
Additionally, the RWMutex-based configuration type was a deadlock
waiting to happen. There is now a read-only clone of the configuration
available atomically at any time. Writers need an exclusive lock on the
ConfigFile object, which commits its changes to disk and readers on
unlock.
This implements a handler for inbound contact request connections,
taking advantage of the synchronous Process API.
This is largely untested code at the moment.
This includes connection management and enough to compile, but doesn't
reimplement most of the protocol messages and functionality yet. There
are problems noted throughout the code, also.
John Brooks