This commit changes outbound routing table sync to use gossip_queries
instead of the effectively deprecated initial_routing_sync feature.
This change removes setting of initial_routing_sync in our outbound Init
message. Instead we now call sync_routing_table after receiving an Init
message from a peer. If the peer supports gossip_queries and
should_request_full_sync returns true, we initiate a full gossip_queries
sync.
Support for the gossip_queries feature flag (bits 6/7) is added to the
Features struct. This feature is available in the Init and Node
contexts. The gossip_queries feature is not fully implemented so this
feature is disabled when sent to peers in the Init message.
This changes the LICENSE file and adds license headers to most files
to relicense under dual Apache-2.0 and MIT. This is helpful in that
we retain the patent grant issued under Apache-2.0-licensed work,
avoiding some sticky patent issues, while still allowing users who
are more comfortable with the simpler MIT license to use that.
See https://github.com/rust-bitcoin/rust-lightning/issues/659 for
relicensing statements from code authors.
This simplifies channelmonitor quite nicely (as expected) as we
never have to be concerned with learning data in a DataLossProtect
which is require for us to claim our funds from the latest remote
commitment transaction.
This adds the ability to check for static_remotekey in appropriate
feature contexts and prints it at connect time. It is still
considered unknown for the purposes of requires_unknown_bits() as
we don't yet implement it.
Include tests for requires_unknown_bits and supports_unknown_bits when
an unknown even bit, odd bit, or neither is set. Refactor bit clearing
such that tests and production code share the same code path. Fix a
potential spec incompatibility (currently only exposed in testing code)
where trailing zero bytes are not removed after a bit is cleared.
Converting from InitFeatures to other Features is accomplished using
Features::with_known_relevant_init_flags. Define a more general
to_context method which converts from Features of one Context to
another.
Additionally, ensure the source context only has known flags before
selecting flags for the target context.
Refactoring the features module allowed for making code specific to
certain contexts generalizable. Specifically, KNOWN_FEATURE_MASK
is defined on Context instead of hardcoded in each method
specialization. Thus, such methods are no longer required.
Features for a given context are duplicated throughout the features
module. Use a macro for defining a Context and the applicable features
such that features only need to be defined for a Context in one place.
The Context provides bitmasks for selecting known and unknown feature
flags.
BOLT 1 and BOLT 9 refer to features as "known" if a peer understands
them. They also use the term "supported" to mean either optional or
required.
Update the features module to use similar terminology.
- Define contexts in terms of required and optional features rather than
just supported features
- Define known features as those that are optional or required
- Rename supported() constructor to known()
For completeness, clear_optional_bit for each feature is now called
clear_bits and clears both optional and required bits.
Each feature is represented by two bits within Features' flags field.
Working with these flags requires bitwise operations, which can be error
prone. Rather than directly checking and manipulating bits, encapsulate
the bits within each feature trait and provide mechanisms for doing so.
This removes the need to comment on which features correspond to bitwise
expressions since the expressions use feature trait identifiers instead.
With this approach, byte literals and expressions can be evaluated at
compile time still. However, for these cases, knowing which byte within
the flags that a feature corresponds to still must be determined by the
implementor.
Remove the special case where initial_routing_sync has no even bit. Now,
it (bit 2) is considered known by the implementation.
The initial_routing_sync feature is set by peer_handler whenever a full
sync of the network graph is desired. It is not explicitly set when
creating features with InitFeatures::supported().
An upcoming refactor will change supported() to known(), which will
return all features known by the implementation. Thus, the
initial_routing_sync flag will need to be set by default. This commit
makes the behavior change ahead of the refactor.
The test_upfront_shutdown_script functional test clears this feature
flag. However, the method used to clear the flag is implemented by bit
toggling. Thus, if the flag is not set the method would actually set it.
Implement the method using bit clearing instead.
This makes Readable symmetric with Writeable and makes sense -
something which is Readable should be Readable for any stream which
implements std::io::Read, not only for a stream type it decides on.
This solves some lifetime-compatibility issues in trying to read()
from a LengthLimitingReader in arbitrary Readable impls.
This implements the new TLV variable-length encoding for onion hop
data, opting to send it if the RouteHop's node_features indicates
support. It also uses the new process_inline method in ChaCha20 to
optimize a few things (though it grows a new TODO for a
probably-important optimization).
This exposes the latest Init-context features in the ChannelDetails
passed to the Router during route calculation, which combines those
with the Node-context features tracked from node_announcements to
provide the latest Node-context features in RouteHop structs.
Fields are also added for Channel-context features, though those are
only partially used since no such features are defined today anyway.
These will be useful when determining whether to use new
TLV-formatted onion hop datas when generating onions for peers.
