Ethereum getcontract

These protobuf message structs need to be auto-generated from a language-neutral. See below. The input and output protobuf message parameters need to be coordinated with the calling application. As the protobuf message data structures are generated from language-independent. Below is an example of a suitable types. StaticCall "Hello", request, signer, response fmt. Println response. Get a handle to our smart contract, from its name and address. The wire type HelloRequest and HelloResponse have to match the input and output parameters of the contract's method we are calling.

Call the Hello method. We use StaticCall as the Hello method has a static context. Calling Solidity contract Now that we have had a quick review of implementing plugins, we can look at accessing smart contracts deployed on the DAppChain's EVM from a plugin.

So our plugin will have two functions- SetValue and GetValue. These functions will just pass data between the SimpleStore contract and the transaction initiator. As it wraps this SimpleStore we will call it EvmExample. Here is the outline as for the EvmExample contract, with stubs added for the SetValue and GetValue methods: package main import "github. The function to call to run a smart contract on the EVM is: contractpb.

CallEVM ctx Context, addr loom. We need to pass the address of the solidity contract, and the correct input. So for our input we need to encode it to something like: 60fe47bdb Don't panic, go-ethereum can help us out. The key function is abi. JSON strings. Pack "set", big. NewInt value. We could either read it in from a file or hard code into the source. The Pack method takes the function signature and a list of the arguments and returns the encoded input. Putting it together Now we know how to get the input and contact address.

At this point, we can give an example of our SetValue method. Note that error checking removed for clarity. We now have to unwrap the output from the solidity contract and return it in a WrapValue message. StaticCallEvm is used as get. It is a view or a constant function. Resolve "SimpleStore" if err! Pack "get" if err!

ParseInt common. Bytes2Hex evmOut , 16, 64 if err! Resolve contractName if err! For this we need the contract's bytecode. A Solidity contract can be converted to byte code using the Solidity compiler using something like this: solc --bin -o. DecodeString can be used to convert a hex string to a []byte array.

We can then use the client. The second return parameter is a transaction hash that can be used to retrieve a receipt of the transaction using the TxHash query. DecodeString string byteHex[2:] if err! ChainID, common. WriteURI, common.

ReadURI return client. Use loom. The main difference is that the function signature and input parameters need to be converted to bytecode using ABI encoding. You can use the go-ethereum abi. Value if err! You can use the transaction hash to retrieve more information about the contract using the GetEvmTxReceipt method.

This returns a transcation receipt, vm. EvmTxReceipt object. ReadURI var receipt vm. GetTxReceipt txHash This returns the result in an ABI encoded []byte. The caller field in StaticCall is optional and using an empty loom. Address is fine. StaticCall input, loom. The main difference in the case of an EvmContract is that the input takes the format of an ABI encoded array. This is a unique hash of the transaction details. These vaults are behave as simply key-value stores dictionaries.

After storing the private keys safely, we need to retrieve them when users call our endpoints. Amount return BadRequest "Not enough balance. Transfer GetCallerPrivateKey , model. To, model. Log MsgType.

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