paperclip-wallet/renderer/blockchain.js

// In renderer process (web page).
const {ipcRenderer} = require('electron');

class Blockchain {
    constructor() {
        this.txSubscribe = null;
        this.bhSubscribe = null;
    }

    getBlock(blockToGet, includeData, clbError, clbSuccess) {
        web3Local.eth.getBlock(blockToGet, includeData, function(error, block) {
            if (error) {
                clbError(error);
            } else {
                clbSuccess(block);
            }
        });
    }

    getAccounts(clbError, clbSuccess) {
        web3Local.eth.getAccounts(function(err, res) { 
            if (err) {
                clbError(err);
            } else {
                clbSuccess(res);
            }
        });
    }

    isAddress(address) {
        return web3Local.utils.isAddress(address);
    }

    getTransaction(thxid, clbError, clbSuccess) {
        web3Local.eth.getTransaction(thxid, function( error, result ) {
            if (error) {
                clbError(error);    
            } else {
                clbSuccess(result);
            }
        });
    }

    getTranasctionFee(fromAddress, toAddress, value, clbError, clbSuccess) {
        web3Local.eth.getTransactionCount(fromAddress, function( error, result ) {
            if (error) {
                clbError(error);    
            } else {
                var amountToSend = web3Local.utils.toWei(value, "ether"); //convert to wei value
                var RawTransaction = {
                    from: fromAddress,
                    to: toAddress, 
                    value: amountToSend,
                    nonce: result
                };
    
                web3Local.eth.estimateGas(RawTransaction, function( error, result ) {
                    if (error) {
                        clbError(error);
                    } else {
                        var usedGas = result + 1;
                        web3Local.eth.getGasPrice(function( error, result ) {
                            if (error) {
                                clbError(error);
                            } else {
                                clbSuccess(result * usedGas);
                            }
                        });
                    }
                });      
            }
        });  
    }

    prepareTransaction(password, fromAddress, toAddress, value, clbError, clbSuccess) {
        web3Local.eth.personal.unlockAccount(fromAddress, password, function( error, result ) {                    
            if (error) {
                clbError("Wrong password for the selected address!");
            } else
            {
                web3Local.eth.getTransactionCount(fromAddress, 'pending', function( error, result ) {
                    if (error) {
                        clbError(error);   
                    } else {
                        var amountToSend = web3Local.utils.toWei(value, "ether"); //convert to wei value
                        var RawTransaction = {
                            from: fromAddress,
                            to: toAddress, 
                            value: amountToSend,
                            nonce: result
                        };

                        web3Local.eth.estimateGas(RawTransaction, function( error, result ) {
                            if (error) {
                                clbError(error);
                            } else {
                                RawTransaction.gas = result + 1;
                                web3Local.eth.getGasPrice(function( error, result ) {
                                    if (error) {
                                        clbError(error);    
                                    } else {
                                        RawTransaction.gasPrice = result;
                                        web3Local.eth.signTransaction(RawTransaction, fromAddress, function( error, result ) {
                                            if (error) {
                                                clbError(error);
                                            } else {
                                                clbSuccess(result);
                                            }
                                        });    
                                    }
                                });
                            }
                        });    
                    }
                });    
            }
        });                
    }

    sendTransaction(rawTransaction, clbError, clbSuccess) {
        web3Local.eth.sendSignedTransaction(rawTransaction, function( error, result ) {
            if (error) {
                clbError(error);
            } else {
                clbSuccess(result);
            }
        });
    }

    getAccountsData(clbError, clbSuccess) {
        var rendererData = {};
        rendererData.sumBalance = 0;
        rendererData.addressData = [];
      
        var wallets = EthoDatatabse.getWallets();
        var counter = 0;
      
        web3Local.eth.getAccounts(function(err, res) { 
          if (err) {
            clbError(err);
          } else {
            for (var i = 0; i < res.length; i++) {
                var walletName =  vsprintf("Account %d", [i + 1]);
                if (wallets) {
                  walletName = wallets.names[res[i]] || walletName;
                }
        
                var addressInfo = {};
                addressInfo.balance = 0;
                addressInfo.address = res[i];
                addressInfo.name = walletName;
                rendererData.addressData.push(addressInfo);
              }
          
              if (rendererData.addressData.length > 0) {
                updateBalance(counter);
              } else {
                clbSuccess(rendererData);
              }       
          }
        });
      
        function updateBalance(index)
        {
          web3Local.eth.getBalance(rendererData.addressData[index].address, function(error, balance) {
            rendererData.addressData[index].balance = parseFloat(web3Local.utils.fromWei(balance, 'ether')).toFixed(2); 
            rendererData.sumBalance = rendererData.sumBalance + parseFloat(web3Local.utils.fromWei(balance, 'ether'));
      
            if (counter < rendererData.addressData.length - 1) {
              counter++;
              updateBalance(counter);
            } else {
              rendererData.sumBalance = parseFloat(rendererData.sumBalance).toFixed(2); 
              clbSuccess(rendererData);
            }
          });    
        }    
    }

    getAddressListData(clbError, clbSuccess) {
        var rendererData = {};
        rendererData.addressData = [];
      
        var wallets = EthoDatatabse.getWallets();
        var counter = 0;
      
        web3Local.eth.getAccounts(function(err, res) { 
          if (err) {
            clbError(err);
          } else {
            for (var i = 0; i < res.length; i++) {
                var walletName =  vsprintf("Account %d", [i + 1]);
                if (wallets) {
                  walletName = wallets.names[res[i]] || walletName;
                }
        
                var addressInfo = {};
                addressInfo.address = res[i];
                addressInfo.name = walletName;
                rendererData.addressData.push(addressInfo);
            }
          
            clbSuccess(rendererData);
          }
        });      
    }

    createNewAccount(password, clbError, clbSuccess) {
        web3Local.eth.personal.newAccount(password, function(error, account) {
            if (error) {
                clbError(error);
            } else {
              clbSuccess(account);
            }
        });
    }

    subsribePendingTransactions(clbError, clbSuccess, clbData) {
        this.txSubscribe = web3Local.eth.subscribe('pendingTransactions', function(error, result){
            if (error) {
                clbError(error);
            } else {
                clbSuccess(result);
            }
        }).on("data", function(transaction){
            if (clbData) {
                clbData(transaction);
            }
        });        
    }

    unsubsribePendingTransactions(clbError, clbSuccess) {
        if (this.txSubscribe) {
            this.txSubscribe.unsubscribe(function(error, success){
                if(error) {
                    clbError(error);
                } else {
                    clbSuccess(success) ;
                }
            });
        }
    }

    subsribeNewBlockHeaders(clbError, clbSuccess, clbData) {
        this.bhSubscribe = web3Local.eth.subscribe('newBlockHeaders', function(error, result){
            if (error) {
                clbError(error);
            } else {
                clbSuccess(result);
            }
        }).on("data", function(blockHeader){
            if (clbData) {
                clbData(blockHeader);
            }
        });        
    }

    unsubsribeNewBlockHeaders(clbError, clbSuccess) {
        if (this.bhSubscribe) {
            this.bhSubscribe.unsubscribe(function(error, success){
                if(error) {
                    clbError(error);
                } else {
                    clbSuccess(success) ;
                }
            });    
        }
    }

    closeConnection() {
        web3Local.currentProvider.connection.close();
    }
}

// create new blockchain variable
EthoBlockchain = new Blockchain();