Raptorcast: Remove peer lookup from packet builder

[xinyuan-dev]

This PR removes the dependency of peer lookup from raptorcast packet builder and postpone the lookup to actual message flushing phase. The change is meant to simplify the packet builder, and further makes it easier to build alternative protocols based on top of the packet builder.

[Copilot]

Pull request overview

This PR refactors the raptorcast packet builder to defer peer address lookups from the packet building phase to the message flushing phase. The key architectural change is that UdpMessage now stores a Recipient object (containing node identity) rather than a resolved SocketAddr, and address resolution is performed lazily when messages are actually sent.

Key changes:

• Removed PeerAddrLookup generic parameter from MessageBuilder and PreparedMessageBuilder
• Changed UdpMessage.dest field to UdpMessage.recipient to defer address resolution
• Added explicit lifetime annotations to various metrics() methods returning ExecutorMetricsChain<'_>

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
monad-raptorcast/src/packet/builder.rs	Removed peer lookup generic parameter and field from MessageBuilder, simplified constructor and PreparedMessageBuilder
monad-raptorcast/src/packet/mod.rs	Changed UdpMessage to use Recipient instead of SocketAddr; made PeerAddrLookup public; updated UdpMessageBatcher to perform lookups during push
monad-raptorcast/src/packet/assembler.rs	Made Recipient public; removed peer lookup from assemble function; refactored GSO aggregation into standalone AggregatedChunk struct
monad-raptorcast/src/packet/assigner.rs	Added explicit lifetime annotations to ChunkAssignment return types
monad-raptorcast/src/lib.rs	Updated MessageBuilder instantiation to remove peer_lookup parameter; added tuple and NameRecordLookup PeerAddrLookup implementations
monad-raptorcast/src/udp.rs	Updated test to use new MessageBuilder::new signature
monad-raptorcast/src/util.rs	Added explicit lifetime annotations to iterator return types
monad-raptorcast/src/decoding.rs	Added explicit lifetime annotation to metrics() return type
monad-raptorcast/src/auth/socket.rs	Added explicit lifetime annotation to metrics() return type
monad-raptorcast/src/auth/protocol.rs	Added explicit lifetime annotation to metrics() trait method and implementations
monad-raptorcast/src/raptorcast_secondary/mod.rs	Added explicit lifetime annotation to metrics() return type
monad-wireauth/src/api.rs	Added explicit lifetime annotation to metrics() return type
monad-raptor/src/r10/nonsystematic/encoder.rs	Added explicit lifetime annotation to Encoder constructor return type

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