NewGraphSyncExtensions creates GraphSyncExtensions from either a request or response object.

GraphSyncBlock is a container for representing extension data for bindnode, it's converted to a block.Block by the message translation layer.

GraphSyncExtensions is a container for representing extension data for bindnode, it's converted to a graphsync.ExtensionData list by ToExtensionsList().

GraphSyncMessage is a container for representing extension data for bindnode, it's converted to a message.GraphSyncMessage by the message translation layer.

GraphSyncRequest is a struct to capture data on a request contained in a GraphSyncMessage.

GraphSyncResponse is an struct to capture data on a response sent back in a GraphSyncMessage.

NamedExtension exists just for the purpose of the constructors.