go-ethereum-event-subscribe

Go Ethereum Event Subscribe

Methods to subscribe on events with go-ethereum

With Compiled ABI

Example with ChainLink Oracle compile the ABI

• Copy the abi from Etherscan to the folder ABIs in a .abi file
• Compile the abi with abigen CLI

abigen --abi=./abis/AccessControlledOffchainAggregator.abi --pkg=abis --out=./abis/AccessControlledOffchainAggregator.go

change the smart contract in main.go

contractAddress := common.HexToAddress("0xAe74faA92cB67A95ebCAB07358bC222e33A34dA7")

Without Compiled ABI

Example with ChainLink Oracle in code folder

• Need to find the Topics[0] of the event we are looking for
• As we are filter all logs to matche the topics we need

if log.Topics[0] == common.HexToHash("0xf6a97944f31ea060dfde0566e4167c1a1082551e64b60ecb14d599a9d023d451") {

update/change the smart contract in main.go

• contractAddress
• description
• decimals

contractAddress := common.HexToAddress("0xAe74faA92cB67A95ebCAB07358bC222e33A34dA7")
description := "BTC/USD"
decimals := int32(8)*-1

Usage

go run main.go