package main import ( "bytes" "encoding/json" "errors" "fmt" "io/ioutil" "log" "net/http" "os" "time" "github.com/ethereum/go-ethereum/common/hexutil" ) var ( HOST = os.Getenv("HOST") HOME = os.Getenv("PWD") ) type Request struct { Version string `json:"jsonrpc"` Method string `json:"method"` Params interface{} `json:"params"` ID int `json:"id"` } type RPCError struct { Code int `json:"code"` Message string `json:"message"` Data interface{} `json:"data,omitempty"` } type Response struct { Error *RPCError `json:"error"` ID int `json:"id"` Result json.RawMessage `json:"result,omitempty"` } func createRequest(method string, params interface{}) Request { return Request{ Version: "2.0", Method: method, Params: params, ID: 1, } } func getTransactionReceipt(hash hexutil.Bytes) (map[string]interface{}, error) { param := []string{hash.String()} rpcRes, err := call("eth_getTransactionReceipt", param) if err != nil { return nil, err } receipt := make(map[string]interface{}) err = json.Unmarshal(rpcRes.Result, &receipt) if err != nil { return nil, err } return receipt, nil } func waitForReceipt(hash hexutil.Bytes) (map[string]interface{}, error) { for i := 0; i < 10; i++ { receipt, err := getTransactionReceipt(hash) if receipt != nil { return receipt, err } else if err != nil { return nil, err } time.Sleep(time.Second) } return nil, errors.New("cound not find transaction on chain") } func call(method string, params interface{}) (*Response, error) { if HOST == "" { HOST = "http://localhost:8545" } req, err := json.Marshal(createRequest(method, params)) if err != nil { return nil, err } var rpcRes *Response time.Sleep(1000000 * time.Nanosecond) /* #nosec */ res, err := http.Post(HOST, "application/json", bytes.NewBuffer(req)) if err != nil { return nil, err } decoder := json.NewDecoder(res.Body) rpcRes = new(Response) err = decoder.Decode(&rpcRes) if err != nil { return nil, err } err = res.Body.Close() if err != nil { return nil, err } return rpcRes, nil } func main() { dat, err := ioutil.ReadFile(HOME + "/counter/counter_sol.bin") if err != nil { log.Fatal(err) } param := make([]map[string]string, 1) param[0] = make(map[string]string) param[0]["from"] = os.Args[1] param[0]["data"] = "0x" + string(dat) txRPCRes, err := call("eth_sendTransaction", param) if err != nil { log.Fatal(err) } var hash hexutil.Bytes err = json.Unmarshal(txRPCRes.Result, &hash) if err != nil { log.Fatal(err) } fmt.Println("Contract TX hash: ", hash) receipt, err := waitForReceipt(hash) if err != nil { log.Fatal(err) } /* //test for bad hash testhash, err := hexutil.Decode("0xe146d95c74a48e730bf825c2a3dcbce8122b8a463bc15bcbb38b9c195402f0a5") if err != nil { log.Fatal(err) } receipt, err := waitForReceipt(testhash) if err != nil { log.Fatal(err) } */ fmt.Println("receipt: ", receipt) }