Compile Contract

First let's compile contract using solidity compiler.

echo 'contract Storage {  
uint pos0;  
mapping(address => uint) pos1;  
  
function Storage_func() public {  
 pos0 = 1234;  
 pos1[msg.sender] = 5678;  
  
 }  
}' | solc --bin -

Generated Bytecode:

6080604052348015600e575f80fd5b5060b680601a5f395ff3fe6080604052348015600e575f80fd5b50600436106026575f3560e01c8063fcff4c0814602a575b5f80fd5b60306032565b005b6104d25f8190555061162e60015f3373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff1681526020019081526020015f208190555056fea2646970667358221220615d2c9c894f2d6ab072b64f478ea2763653cb8223893c4b22e91ffd8c3c817864736f6c63430008190033

Contract

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.8.2 <0.9.0;

/**
* @title Storage
* @dev Store & retrieve value in a variable
* @custom:dev-run-script ./scripts/deploy_with_ethers.ts
*/

contract Storage {
uint pos0;
mapping(address => uint) pos1;

function Storage_func() public {
  pos0 = 1234;
  pos1[msg.sender] = 5678;
  }
}

Deploy contract

curl --data '{"from": "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266", "data": "0x6080604052348015600e575f80fd5b5060b680601a5f395ff3fe6080604052348015600e575f80fd5b50600436106026575f3560e01c8063fcff4c0814602a575b5f80fd5b60306032565b005b6104d25f8190555061162e60015f3373ffffffffffffffffffffffffffffffffffffffff1673ffffffffffffffffffffffffffffffffffffffff1681526020019081526020015f208190555056fea2646970667358221220615d2c9c894f2d6ab072b64f478ea2763653cb8223893c4b22e91ffd8c3c817864736f6c63430008190033"}' -H "Content-Type:application/json" localhost:3000/eth/tx -X POST

Send Transaction for executing function Storage_func.

Note: We are updating state of Ethereum on calling this function. Therefore, calling this function should be done through eth_sendTransaction and not eth_call.

• Through JSON RPC API
  ​​​​curl --data '{"jsonrpc":"2.0","method": "eth_sendTransaction", "params":[{"from": "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266", "to": "0x5fbdb2315678afecb367f032d93f642f64180aa3", "data": "0xfcff4c08"}], "id": 8}' -H "Content-Type: application/json" localhost:8545
  

OR

• Through ethRPCtoREST
  ​​​​curl --data '{"from": "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266", "to": "0x5fbdb2315678afecb367f032d93f642f64180aa3","data": "Storage_func()"}' -H "Content-Type: application/json" localhost:3000/eth/tx -X POST
  

Read storage from contract

Get pos0 value from contract with contract address 0x5fbdb2315678afecb367f032d93f642f64180aa3 at following path.

http://localhost:3000/eth/storage/0x5fbdb2315678afecb367f032d93f642f64180aa3/0/latest

Get value from map stored in pos1 using caller address (msg.sender) as key in the map.

http://localhost:3000/eth/storage/0x5fbdb2315678afecb367f032d93f642f64180aa3/1/latest?map=0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266