Module vshard_handler 

Shard-side handler for incoming VShardEnvelope messages.

When a remote node sends a VShardEnvelope via QUIC (wrapped in RaftRpc::VShardEnvelope), the transport server routes it here. This handler dispatches based on VShardMessageType to the appropriate engine handler:

• Graph BSP messages → graph algorithm shard handler
• Timeseries scatter → local scan + partial aggregate response
• Retention command → local retention enforcement
• S3 archive command → local archive execution

Enums

DispatchTarget

Which engine subsystem should handle this envelope.

HandleResult

Result of handling a VShardEnvelope.

Traits

VShardHandler

Trait for handling incoming VShardEnvelope messages on a shard.

Functions

build_ts_retention_ack

Build a response envelope for a retention acknowledgement.

build_ts_scatter_response

Build a response envelope for a timeseries scatter response.

dispatch_by_type

Default handler that dispatches based on message type.