How to modify and add a manual sync feature?

[canonbrother]

Substrate blockchain automatically syncs up upon starting, however, I'd like to have manual sync feature for some devs purpose.

flowchart LR

subgraph P2P Network

%% n2 -- 1. discover --> n1
%% n2 -- 2. connect --> n1
n2 -- rpc::sync --> n1

subgraph n1
n1.1 --> n1.2
end

subgraph n2
n2.1 -.-> n2.2
end
end

Loading

Todo

• Add manual sync mode to stop auto sync by default
• Add rpc::sync(Option<Hash>) to start sync (discover -> connect) node, stop sync on target hash while Option<Hash> is provided else on best

As I am new to substrate and rust, this is not quite as straightforward as I would have thought, I simply cannot figure out how to proceed.

[bkchr]

This is currently not that easy possible. After this issue is done, it should maybe be a little bit easier.

However, could you describe on what you want to achieve with this?