Stop chain after a specified number of blocks mined or reach a specified height.

[yangby-cryptape]

Contact Details

No response

Propose-a-new-feature

Proposed Feature

Stop chain after a specified number of blocks mined or reach a specified height.

A proposal:

# Exit after mine 10 blocks.
axon run --mine-limit 10
# Exit after reach block 10
axon run --mine-to 10

Reason

When run axon run, there is no way to:

• stop process programmatically.
• stop it at a specified height accurately.

This feature would help a lot for tests.

For example:

• If I want to test migrations:
  • Start a chain with the old binary, mine 10 blocks.
  • Stop the chain.
  • Start a chain with the new binary.

In above example, I have to use JSON-RPC to test which height is reached, then stop it.

• And, if I am correct, currently there is no truncate / rollback method.

  When I want to test a chain that tip is 10, I check the height with JSON-RPC, when it reaches height 10, then send stop signal, it may reaches 11.

  I could not truncate the chain, so I have to re-run the chain.

  See, to control the tip is difficult.

In Further

As I said in above section, if I am correct, currently there is no truncate / rollback method.
Because these methods are unsuitable for a account model chain.

But it is useful for testing forked blocks and a bad chain network with abnormal nodes.

For a alternative choice, I checked ethereum clients:

• geth has a command geth attach, it could sync blocks to a specific block. (ref: a guide in reddit)

Axon could add a similar command.

Alternatives you've considered

No response

Anything else?

All features I proposed in this issue, are used for testing.

So the priority is low.