ethereum/py-evm

Jason Carver

@carver

I merged in the #1858 changes (in #1871 ) and am starting in on a release...

Jason Carver

@carver

py-evm released: https://py-evm.readthedocs.io/en/latest/release_notes.html#py-evm-0-3-0-alpha-8-2019-11-05

@/all

Voith Mascarenhas

@voith

:tada:

Just some guy

@fubuloubu

Thanks for the fix to ethereum/py-evm#1865

Jason Carver

@carver

:+1:

Jacques Wagener

@jacqueswww

:clap:

Chris Calderon

@SerpentChris

If I want to make a chain to use for testing a smart contract, can I use the Chain class instead of the MiningChain class?

Christoph Burgdorf

@cburgdorf

@SerpentChris You need the MiningChain class when you want to build blocks incrementally instead of importing blocks in one go.

Jason Carver

@carver

For testing, you might be interested in using web3.py with eth-tester (which uses py-evm under the hood)

Just some guy

@fubuloubu

is Python 3.8 in the works for this project and eth-tester?

Jason Carver

@carver

I don't think there should be any problems w/ running it in py3.8. Do you know of anything? Obviously we'll want to add tests at some point, but it's not an active project that I know of @fubuloubu

Jason Carver

@carver

nm, I see in ethereum/vyper#1678 that there's some problem with the blake2b library

Just some guy

@fubuloubu

We were trying to upgrade, but I think it's just been premature. Is it just me, or has 3.7/3.8 moved a lot faster than previous release?

Monir Shaker

@Moniroaf

i have some problems to compile the app.py i conudn't call the contract from the file sol ?!!

pinnaculum

@pinnaculum

congrats on py-evm this is huge

Noel Maersk

@veox

18 days later, ACD is noisy because of the difficulty bomb. :/

TL;DR: There might be an out-of-schedule call on Friday.

(I suggest you wonderful busy folk don't waste time on reading it all.)

Jason Carver

@carver

whoops, thanks for pointing it out (twice now!)

Noel Maersk

@veox

Heh, that's not what I meant by the comment, but thanks for fixing. :)

Jason Carver

@carver

Griffin Ichiba Hotchkiss

@gichiba

Happy thanksgiving, americans! I'm looking to be pointed in the right direction with how to play with py-evm... I want to do essentially what is done in this exercise: https://easythereentropy.wordpress.com/2014/06/04/understanding-the-ethereum-trie/ -- but using py-evm instead of pythereum, and using the nice boilerplate project template that you have in the cookbooks. My question is where in the py-evm API or source would I find the logic that does the same thing trie.py does in pyethereum? Or, perhaps I'm totally going about this the wrong way, in which case my question is even more general: What's a good starting place for simple DB/State/Trie understanding of the evm?

Jason Carver

@carver

Yeah, if you just want to play around with tries, check out https://github.com/ethereum/py-trie @gichiba
I just noticed an "early release" warning on the README of py-trie. That could be removed now. It is the library that py-evm uses, and has gone through a solid amount of testing at this point. It could be optimized a lot more, but I'm not generally concerned about correctness, at least for evm-specific configurations (like always using 32-byte keys).

Griffin Ichiba Hotchkiss

@gichiba

Thanks @carver !

Jason Carver

@carver

I'm preparing py-evm for the Istanbul fix release today. The previous release incorrectly included an ice age delay.

Jason Carver

@carver

@/all py-evm with the fixed Istanbul (and a couple other things) is released:
https://py-evm.readthedocs.io/en/latest/release_notes.html#py-evm-0-3-0-alpha-9-2019-12-02

Noel Maersk

@veox

I have a feeling someone'll have to take over PR #1885 from me, or provide a lot of guidance.

The current lint failures are all for improper definitions/returns in low-level API classes: AccountDatabaseAPI, OpcodeAPI, VirtualMachineAPI; and some related abstract classes.

Take a look at this CI job most errors are an either-or choice, and I don't know which one is "correct".

There's also

eth/chains/base.py:250: error: Unexpected keyword argument "chain_context" for "VirtualMachineAPI"
eth/abc.py:2270: note: "VirtualMachineAPI" defined here

which means something unexpected may be happening.

Jason Carver

@carver

I'm on mobile now, but if you cc me on the PR, I'll take a look

Noel Maersk

@veox

@carver I went AFK immediately after posting y-day, sorry. Maybe it was a little too panicky. I'll cc you in a sec.

Jason Carver

@carver

@/all critical Istanbul bugfix release: https://py-evm.readthedocs.io/en/latest/release_notes.html#py-evm-0-3-0-alpha-10-2019-12-09
Trinity release coming shortly

Kjetil Vaagen

@KjetilVaa

Does anyone have any experience with Clique consensus who can help?

Noel Maersk

@veox

@KjetilVaa Very little. Anything specific?

Alan Justino da Silva

@alanjds

Hi. How near the py-evm is of the Golang version?

I mean, is it "safe" or is better to interface with the Golang via RPCs?

Jason Carver

@carver

It's in alpha, so it's not production-ready. @alanjds
Also, if you want to run a node, check out trinity which uses py-evm under the hood, but also handles all the peering, json-rpc, etc (also in alpha, of course)

Alan Justino da Silva

@alanjds

It's in alpha, so it's not production-ready. @alanjds
Also, if you want to run a node, check out trinity which uses py-evm under the hood, but also handles all the peering, json-rpc, etc (also in alpha, of course)

Tkx, @carver. I will take a look.

Jason Carver

@carver

@/all posted a new release, for the last known Istanbul bug
https://py-evm.readthedocs.io/en/latest/release_notes.html#py-evm-0-3-0-alpha-11-2019-12-12

Just some guy

@fubuloubu

famous last words lol

Jason Carver

@carver

heh

Christoph Burgdorf

@cburgdorf

@/all Muir Glacier support is here:
Docs:
https://py-evm.readthedocs.io/en/latest/release_notes.html#py-evm-0-3-0-alpha-12-2019-12-19

Tweet:
https://twitter.com/ETHSnakeCharmer/status/1207686373282594817

Voith Mascarenhas

@voith

:tada:

Christoph Burgdorf

@cburgdorf

@KjetilVaa What is your question regarding Clique?

Christoph Burgdorf

@cburgdorf

Related: We've just released a new Py-EVM version that refactors consensus handling to make it more flexible and sound.
https://py-evm.readthedocs.io/en/latest/release_notes.html#py-evm-0-3-0-alpha-13-2020-01-13

Suraj Singla

@surajsingla333

Hi all, I am creating a python script that will list all the peer nodes connected to the bootnode which I will provide. Can anyone help me with how I can list all the peer nodes using trinity?
Thanks

Eth-Gitter-Bridge

@Eth-Gitter-Bridge

<carver> (asked and answered on the trinity channel)

Peteris Erins

@Pet3ris

Hi There, is there a way to get the current executing computation/transaction from a State object? In particular I'd love to access the current stack contents, memory contents that seem to be embedded in the computation.

Eth-Gitter-Bridge

@Eth-Gitter-Bridge

<Christoph> @Pet3ris I'm afraid I can not answer this without diving into the code myself. One thing I suggest is to run py-evm with log level 0 to get full tracing output. Then you'll see output such as: https://gist.github.com/cburgdorf/41ce3a9c9502d2f194c9e54454e6a689

You can search for the output in Py-EVM and sprinkle the code paths with breakpoint() statements and then use the debugger to examine from there. That's how I'd approach it.

Peteris Erins

@Pet3ris

Hi @Eth-Gitter-Bridge, thanks for your comment. I'm already using the debugger unfortunately and digging into the code. I just wasn't able to find a way to access the ongoing computation. I've found a way to access the Execution Environment, simply vm.state.coinbase etc., but I'd like to find something like vm.current_transaction.computation.stack and vm.current_transaction.computation.memory to get other elements

Jason Carver

@carver

@Pet3ris do you mean in between transactions or mid-transaction? There's no concept of a "current transaction", the VM is not stateful in that way. But if you're curious in between transactions, there are more options besides breakpoints. If you can share an example showing what you are trying to inspect, I can help more.

Peteris Erins

@Pet3ris

@carver yep - what I'm trying to do is to monkey patch the debug2 function to inspect intermediate EVM state

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