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William Banfield 1069ffc6aa config: backport the rename of fastsync to blocksync (#9259 )

This is largely a cherry pick of #6755 with some additional fixups added where detected. 
This change moves the blockchain package to a package called blocksync. Additionally, it renames the relevant uses of the term `fastsync` to `blocksync`.

closes: #9227 

#### PR checklist

- [ ] Tests written/updated, or no tests needed
- [x] `CHANGELOG_PENDING.md` updated, or no changelog entry needed
- [x] Updated relevant documentation (`docs/`) and code comments, or no
      documentation updates needed

2022-08-17 15:19:20 +00:00

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order

order
2

Block Sync

Channel

Block sync has one channel.

Name	Number
BlocksyncChannel	64

Message Types

There are multiple message types for Block Sync

BlockRequest

BlockRequest asks a peer for a block at the height specified.

Name	Type	Description	Field Number
Height	int64	Height of requested block	1

NoBlockResponse

NoBlockResponse notifies the peer requesting a block that the node does not contain it.

Name	Type	Description	Field Number
Height	int64	Height of requested block	1

BlockResponse

BlockResponse contains the block requested.

Name	Type	Description	Field Number
Block	Block	Requested Block	1

StatusRequest

StatusRequest is an empty message that notifies the peer to respond with the highest and lowest blocks it has stored.

Empty message.

StatusResponse

StatusResponse responds to a peer with the highest and lowest block stored.

Name	Type	Description	Field Number
Height	int64	Current Height of a node	1
base	int64	First known block, if pruning is enabled it will be higher than 1	1

Message

Message is a oneof protobuf type. The oneof consists of five messages.

Name	Type	Description	Field Number
block_request	BlockRequest	Request a block from a peer	1
no_block_response	NoBlockResponse	Response saying it doe snot have the requested block	2
block_response	BlockResponse	Response with requested block	3
status_request	StatusRequest	Request the highest and lowest block numbers from a peer	4
status_response	StatusResponse	Response with the highest and lowest block numbers the store	5

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