eth_getLogs.go

func ethGetLogs(contractAddress string, hexOfEvent string) {
	generateZeros := func() string {
		str := ""
		for i := 0; i < 24; i++ {
			str += "0"
		}
		return str
	}

	ethAddress = fmt.Sprintf("0x%s%s", generateZeros(), ethAddress[2:])
	// eth_getLogs API: https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_getlogs
	// Topics see https://ethereum.stackexchange.com/questions/12553/understanding-logs-and-log-blooms
	requestJsonText := fmt.Sprintf(
		`{"jsonrpc":"2.0","method":"eth_getLogs"`+
			`,"params":[{"fromBlock": "0x1", "topics":["%s"], "address": "%s"}]`+
			`, "id": 1}`,
		hexOfUploadProofFunc,
		contractAddress,
	)
	body := strings.NewReader(requestJsonText)
	req, err := http.NewRequest("POST", "https://rinkeby.infura.io", body)
	if err != nil {
		fmt.Println(err)
		return
	}
	req.Header.Set("Content-Type", "application/x-www-form-urlencoded")

	resp, err := http.DefaultClient.Do(req)
	if err != nil {
		fmt.Println(err)
		return
	}
	defer resp.Body.Close()

	bytes, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		fmt.Println(err)
		return
	}

	fmt.Println(string(bytes))
}