Nethereum/Nethereum

Ethereum RPC Client Library in .Net C#

sz.sahaj

@saszer

is it possible to mod nethereum ( im mostly working with Unity's 461 example) to interact with matic network instead of eth?

Juan Blanco

@juanfranblanco

@BadgerTheAdger set the From Address in your transferFunction, top of my head, although you need to validate if you have any erc20 token as when it does the estimation will throw an error if you don't

@notBehemoth_twitter as a query it will be only one, BUT if it returns an error code it will try to decode it

@saszer i don't know..

Juan Blanco

@juanfranblanco

i ll need to talk to them

but after a quick look i think you need to use this https://rpc-mumbai.matic.today

and use chainId of 80001

kunalbarchha

@kunalbarchha

@juanfranblanco Do you know anyone expert in Web3j to resolve a "Filter not found" issue in transactionFlowable function. It's a paid task.

Juan Blanco

@juanfranblanco

i guess somebody from web3 labs could do that on the side

kunalbarchha

@kunalbarchha

I tried !

Juan Blanco

@juanfranblanco

@kunalbarchha sorry i had to go, is this related to logs using websockets subscriptions?

are you using infura?

kunalbarchha

@kunalbarchha

@juanfranblanco transaction subscription using socket, yes. I tried with setting up local GETH and also infura. Talked with Web3J guys, devs from GETH, and what not.

web3j/web3j#1218

Juan Blanco

@juanfranblanco

can you reproduce it in Nethereum ? https://github.com/Nethereum/Nethereum.WSLogStreamingUniswapSample

will it be due to the client disconnecting the socket and need to reconnect?

kunalbarchha

@kunalbarchha

Don't have C# env setup

need to do that

Jason Payne

@NeoXtreem

I'm using EthNewPendingTransactionObservableSubscription but I'd like to filter on a contract address (Uniswap V2 Router 2). I've tried the following, but it results in no events at all, not even the Uniswap ones:

await subscription.SubscribeAsync(Event<TransferEventDto>.GetEventABI().CreateFilterInput("0x7a250d5630b4cf539739df2c5dacb4c659f2488d"));

Is it possible to do this? Or, even better, can I just subscribe to pending transactions on the Uniswap contract instead?

cesarsld

@cesarsld

@juanfranblanco Hey sorry for taking so long to get back to you! I tested your repo (uniswap pubsub) on my laptop (macbook) and it didn't work.....
BUT, I uploaded code on a ubunu server that I have and it worked there! So I think I need to update my dotnet version on my macbook or something... Thanks for helping out!

Juan Blanco

@juanfranblanco

@NeoXtreem no you cannot do that , pending transactions are not "filterable"

@cesarsld great (ish) let me know if you fix it in your mac

Behemoth

@notBehemoth_twitter

@juanfranblanco Thanks for all the help :)

Leon Do

@_LeonDo__twitter

anyone here using Nethereum + Unity? I wrote an article about it. I’d love to get some feedback https://medium.com/coinmonks/part-1-using-nethereum-in-unity-54e62f7e65d5

Behemoth

@notBehemoth_twitter

@juanfranblanco Do you see any problems in the below code?

var ethSwapHandler = web3.Eth.GetContractTransactionHandler<SwapExactETHForTokensFunction>();
                var ethSwapDTO = new SwapExactETHForTokensFunction
                {
                    AmountToSend = Web3.Convert.ToWei(wethToTrade), // wethToTrade = 1
                    AmountOutMin = Web3.Convert.ToWei(amountOutMin), // amountOutMin = 7.25
                    Path = path,
                    To = myWallet,
                    Deadline = ((DateTimeOffset)DateTime.Now).ToUnixTimeSeconds() + 1200,
                    GasPrice = Web3.Convert.ToWei(gasPriceToUse, UnitConversion.EthUnit.Gwei), // gasPriceToUse = 300 (taken from Etherscan + 200)
                    Gas = Web3.Convert.ToWei(400000)
                };

                var transactionEthSwapReceipt = await ethSwapHandler.SendRequestAndWaitForReceiptAsync(uniswapContractAddress, ethSwapDTO);

I wasn't converting the amountOutMin & Gas amounts to Wei before. Could that be the reason for getting the 'insufficient funds for gas * price' error?

Juan Blanco

@juanfranblanco

@_LeonDo__twitter great articles!!!

Juan Blanco

@juanfranblanco

@notBehemoth_twitter hmm i cannot see any issue, regarding the insufficient funds it might have been due to an error if you had not convert it, the amount will be smaller

Allen Hena

@RealAllenHena_twitter

Hi is there any way in Nethereum to write everything in C# and somehow it compiles or ports to an ETH ABI/smart contract?

Juan Blanco

@juanfranblanco

Hi @RealAllenHena_twitter you want to write smart contracts in C# ?

we have discussed this many years ago, it it truly did not make any sense

there was an effort to so compile at the time to convert to IL to EVM opcodes, and others to transpile.. both truly don't make any sense as you will prefer Solidity anytime as it advances much faster and is closer to the chain. Also the reuse of smart contract logic, best practices etc it is best done in Solidity.

Now having a top layer that might protect you from common solidity mistakes might have been "good" but truly it wont give you much of an advantage

Juan Blanco

@juanfranblanco

If you could take advantage of some of the .net libraries etc.. that could have been interesting.. but yet again, everything is linked to the evm with its small pitfalls but also confined to the limitations of the blockchain.

what requirements you had in mind?

Behemoth

@notBehemoth_twitter

@juanfranblanco Thanks. The swaps work on mainnet now. I have a question regarding Uniswap trades for you - When trading is paused / disabled for a token on Uniswap (by the token creators), one can see a 'UniswapV2: TRANSFER_FAILED. There is an error with one of the tokens you are trading' error message pop up on the UI as soon as you hit the 'SWAP' button. What check might this be making to figure out that the token trade is paused? I tried swaps for a token that had its trading paused by the token devs and ended up submitting a few transactions to the blockchain which all failed due to the same error, but they cost gas! The Uniswap frontend is able to figure this out without spending gas, is there any READ function on the router / factory that allows this kind of query? I will post this question to Uniswap as well, but I thought you might already know the solution. :)

Samguy036

@Samguy036

@juanfranblanco Hello Juan, when I'm compiling to Android APK by Unity, Google Play requests IL2CPP backend with ARM64. However, when I test it on phone, all the Ethereum codes are just not working, strangely I don't see any error message. By the way I already disabled "Strip engine code" option, so do you probably know what happened?

If I change to Mono backend, everything is fine.

Juan Blanco

@juanfranblanco

@notBehemoth_twitter can you send me a token example? i have not seen the function for that in the smart contracts..

Samguy036

@Samguy036

If I change to Mono backend, everything is fine.

Actually, I got the error message "NotSupportedException: System.Reflection.Emit.DynamicMethod"

Juan Blanco

@juanfranblanco

@Samguy036 ah.. are you not using the aot version? which includes the json.net aot?

the same for webgl

Samguy036

@Samguy036

Juan Blanco

@juanfranblanco

are you using these?

https://github.com/Nethereum/Nethereum/releases/download/3.5.0/net461dllsAOT.zip

Samguy036

@Samguy036

I'm using this

Not sure if it's AOT

Can you distinguish?

Juan Blanco

@juanfranblanco

just replace with the others i sent you

the aot is linked to that specific version of json.net

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