[Ethereum Youtube] Writing Smart Contracts with Mutan and Ethereum Go - Episode 1, 2 and 3

StephanTual

This thread is to post new tutorials in the OP message and discuss them within the thread.

Go Ethereum Episode 1: Introduction and ecosystem


Go Ethereum Episode 2: Installing the Go Ethereum client


Go Ethereum Episode 3: Writing a meta-coin smart contract

ethergrok

Good work, and yes, I did get some insights on many things that I would not have considered if only working through the C++ client and LLL contract language creations. Thanks for doing this and spending the time.

creemej

I don't see how the local app (JefCoin/samplecoin) is started.
It's located in ethereal/.../assets.
I can start several instances of ethereal and transfer coins between the different accounts.
Make a new contract on the blockchain.
But how can I start a local app that controls this new contract on the blockchain, like JefCoin in demo (episode 3).

SimonLondon

This blog post could help you
http://hidskes.com/blog/2014/05/21/ethereum-dapp-development-for-web-developers/

creemej

Yes, it's that what I want to do.
But I don't see how to start the webapp (the resulting webpage, the interface to the contract).

SimonLondon

It worked fine for me

The only thing I changed was the contract address

You are on the latest version right? Its poc5 rc8

comes up starting ethereum GUI v0.5.0 RC8

I did not post in the other thread to keep it all here

creemej

Start ethereal like this, but where do I have to save the webpage (genericcoin.html and main.js)

macee:~ jac$ ethereal -m -asset_path=/usr/local/share/go-ethereum-gui/assets
...
2014/05/22 15:09:27 Starting Ethereum GUI v0.5.0 RC8

SimonLondon

start like this

ethereal -m -dir=".ethereal2"

(or whatever directory you want to use - I use about 5 different ones)

I forget what the asset path flag is but I never use it since I always run ethereal from

cd $GOPATH/src/github.com/ethereum/go-ethereum/ethereal

You can save the html and js anywhere but of course make sure the js is in the same directory as the html

creemej

I have to use the asset_path, else it doesn't start with message:
asset not found: you can set an alternative asset path on on the command line using option 'asset_path'

I have also used different directories and made transfers from one account to the other.

Maybe I have to reinstall eth-go/go-ethereum for a clean situation without the need for the asset_path.

SimonLondon

Hope that a reinstall works for you, let us know how it goes
Not sure why you need the asset_path option
Sorry I can't be of more help

creemej

Just one question.
Is your install also on OSX or is it on Linux or Windows

Thanks for your help

SimonLondon

OSX mavericks 10.9.2

creemej

Now it works!

Rolled back to 5.2.0

https://github.com/ethereum/go-ethereum/issues/35#issuecomment-43983173

SimonLondon

Good news

StephanTual

@creemej‌ : It appears that RC8 indeed broke the fix that was in RC7 regarding locking to QT 5.2.0