eth/tracers: live chain tracing with hooks (#29189 )

Here we add a Go API for running tracing plugins within the main block import process. 

As an advanced user of geth, you can now create a Go file in eth/tracers/live/, and within
that file register your custom tracer implementation. Then recompile geth and select your tracer
on the command line. Hooks defined in the tracer will run whenever a block is processed.

The hook system is defined in package core/tracing. It uses a struct with callbacks, instead of 
requiring an interface, for several reasons:

- We plan to keep this API stable long-term. The core/tracing hook API does not depend on
  on deep geth internals.
- There are a lot of hooks, and tracers will only need some of them. Using a struct allows you
   to implement only the hooks you want to actually use.

All existing tracers in eth/tracers/native have been rewritten to use the new hook system.

This change breaks compatibility with the vm.EVMLogger interface that we used to have.
If you are a user of vm.EVMLogger, please migrate to core/tracing, and sorry for breaking
your stuff. But we just couldn't have both the old and new tracing APIs coexist in the EVM.

---------

Co-authored-by: Matthieu Vachon <matthieu.o.vachon@gmail.com>
Co-authored-by: Delweng <delweng@gmail.com>
Co-authored-by: Martin HS <martin@swende.se>

2024-03-22 18:53:53 +01:00

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Filling test cases

To fill test cases for the built-in tracers, the makeTest.js script can be used. Given a transaction on a dev/test network, makeTest.js will fetch its prestate and then traces with the given configuration. In the Geth console do:

let tx = '0x...'
loadScript('makeTest.js')
makeTest(tx, { tracer: 'callTracer' })

354 B Raw Permalink Blame History

Filling test cases

354 B

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