I am trying to send a raw transaction with eth.sendTransaction but I am getting an error that says {"code":-32000,"message":"unknown account"}. I am not sure what is causing this and I cant seem to find an answer on the internet. Can anyone help me figure it out? Here is my code:
func ExecuteSignedTransaction(rawTransaction string) {
var hash web3.Hash
data := make(map[string]interface{})
data["data"] = rawTransaction
err := Web3HTTPClient.Call("eth_sendTransaction", &hash, data)
if err != nil{
fmt.Println(err)
Os.Exit(1)
}
fmt.Println("Sent tx hash:", hash)
}
So, what I might do here:
import (
"strings"
"crypto/ecdsa"
"math/big"
"github.com/ethereum/go-ethereum/ethclient"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
)
var chainId = big.NewInt(1) // chain id for the ethereum mainnet, change according to needs
func ecdsaPrivateKeyFromHex(privKeyHex string) *ecdsa.PrivateKey {
ecdsaKey, err := crypto.HexToECDSA(privKeyHex)
if err != nil { panic(err) }
return ecdsaKey
}
func newTransactOpts(privKey *ecdsa.PrivateKey) *bind.TransactOpts {
transactOpts, err := bind.NewKeyedTransactorWithChainID(privKey, chainId)
if err != nil { panic(err) }
return transactOpts
}
func newRpcClient() *ethclient.Client {
c, err := ethclient.Dial("insert rpc url here")
if err != nil { panic(err) }
return c
}
// note: constructing the *types.Transaction object left as
// an exercise to the reader
func ExecuteTransaction(rawTransaction *types.Transaction) {
privKeyHex := "0xblahblahblahblahblah" // use your own account's private key
transactOpts := newTransactOpts(ecdsaPrivateKeyFromHex(privKeyHex))
signedTxn, err := transactOpts.Signer(transactOpts.From, rawTransaction)
if err != nil { panic(err) }
rpcClient := newRpcClient()
if err := rpcClient.SendTransaction(context.Background(), signedTxn); err != nil { panic(err) }
// do whatever
}
My program:
package main
import (
"fmt"
"io"
"log"
"net"
"github.com/gobwas/ws"
)
func HandleConn(conn net.Conn) {
for {
header, err := ws.ReadHeader(conn)
if err != nil {
log.Fatal(err)
}
buf := make([]byte, header.Length)
_, err = io.ReadFull(conn, buf)
if err != nil {
log.Fatal(err)
}
fmt.Println(buf)
fmt.Println(string(buf))
}
}
func main() {
ln, err := net.Listen("tcp", "localhost:8080")
if err != nil {
log.Fatal(err)
}
for {
conn, err := ln.Accept()
if err != nil {
log.Fatal(err)
}
_, err = ws.Upgrade(conn)
if err != nil {
log.Fatal(err)
}
go HandleConn(conn)
}
}
I do in browser console:
let socket = new WebSocket("ws://127.0.0.1:8080")
socket.send("Hello world")
I see random bytes in the my terminal. Each call to socket.send("Hello world") return different bytes. But the length of the byte array is always equal to the length of the string. Where does golang get these random bytes? How can I fix this? My program is an example from the docs.
If you are going to not use the wsutil you need to unmask the payload:
buff := make([]byte, header.Length)
_, err = io.ReadFull(conn, buff)
if err != nil {
// handle error
}
if header.Masked {
ws.Cipher(buff, header.Mask, 0)
}
fmt.Println(string(buff))
If you know the name of a network card, how can you get its instance ID?
eg: WLAN 2 {74892867-F98B-454B-904F-88912DDE4B9F}.
I don't want to use the command line; it's better to work with the registry. What should be the policy that matches the network card in the registry (HKLM/SYSTEM/CurrentControlSet/Control/Class/{4d36e972-e325-11ce-bfc1-08002be10318})?
Language: Go 1.11
Platform: Windows 10
Get All NetCfgInstanceId on Your Windows.
package main
import (
"fmt"
"log"
"golang.org/x/sys/windows/registry"
)
const ADAPTER_KEY = `SYSTEM\CurrentControlSet\Control\Class\{4D36E972-E325-11CE-BFC1-08002BE10318}`
func main() {
k, err := registry.OpenKey(registry.LOCAL_MACHINE, ADAPTER_KEY, registry.ENUMERATE_SUB_KEYS|registry.QUERY_VALUE)
if err != nil {
log.Fatal(err)
}
defer k.Close()
keyNames, err := k.ReadSubKeyNames(-1)
if err != nil {
log.Fatal(err)
}
for _, keyName := range keyNames {
n, _ := matchKey(k, keyName)
if n != "" {
fmt.Println(n)
}
}
}
func matchKey(zones registry.Key, keyName string) (string, error) {
k, err := registry.OpenKey(zones, keyName, registry.READ)
if err != nil {
return "", err
}
defer k.Close()
netCfgInstanceId, _, err := k.GetStringValue("NetCfgInstanceId")
if err != nil {
return "", err
}
return netCfgInstanceId, nil
}
Is there an easy way to get the permanent MAC Address using Go?
package main
import (
"fmt"
"log"
"net"
)
func getMacAddr() ([]string, error) {
ifas, err := net.Interfaces()
if err != nil {
return nil, err
}
var as []string
for _, ifa := range ifas {
a := ifa.HardwareAddr.String()
if a != "" {
as = append(as, a)
}
}
return as, nil
}
func main() {
as, err := getMacAddr()
if err != nil {
log.Fatal(err)
}
for _, a := range as {
fmt.Println(a)
}
}
Here is a code snippet that reads CSV file:
func parseLocation(file string) (map[string]Point, error) {
f, err := os.Open(file)
defer f.Close()
if err != nil {
return nil, err
}
lines, err := csv.NewReader(f).ReadAll()
if err != nil {
return nil, err
}
locations := make(map[string]Point)
for _, line := range lines {
name := line[0]
lat, laterr := strconv.ParseFloat(line[1], 64)
if laterr != nil {
return nil, laterr
}
lon, lonerr := strconv.ParseFloat(line[2], 64)
if lonerr != nil {
return nil, lonerr
}
locations[name] = Point{lat, lon}
}
return locations, nil
}
Is there a way to improve readability of this code? if and nil noise.
Go now has a csv package for this. Its is encoding/csv. You can find the docs here: https://golang.org/pkg/encoding/csv/
There are a couple of good examples in the docs. Here is a helper method I created to read a csv file and returns its records.
package main
import (
"encoding/csv"
"fmt"
"log"
"os"
)
func readCsvFile(filePath string) [][]string {
f, err := os.Open(filePath)
if err != nil {
log.Fatal("Unable to read input file " + filePath, err)
}
defer f.Close()
csvReader := csv.NewReader(f)
records, err := csvReader.ReadAll()
if err != nil {
log.Fatal("Unable to parse file as CSV for " + filePath, err)
}
return records
}
func main() {
records := readCsvFile("../tasks.csv")
fmt.Println(records)
}
Go is a very verbose language, however you could use something like this:
// predeclare err
func parseLocation(file string) (locations map[string]*Point, err error) {
f, err := os.Open(file)
if err != nil {
return nil, err
}
defer f.Close() // this needs to be after the err check
lines, err := csv.NewReader(f).ReadAll()
if err != nil {
return nil, err
}
//already defined in declaration, no need for :=
locations = make(map[string]*Point, len(lines))
var lat, lon float64 //predeclare lat, lon
for _, line := range lines {
// shorter, cleaner and since we already have lat and err declared, we can do this.
if lat, err = strconv.ParseFloat(line[1], 64); err != nil {
return nil, err
}
if lon, err = strconv.ParseFloat(line[2], 64); err != nil {
return nil, err
}
locations[line[0]] = &Point{lat, lon}
}
return locations, nil
}
//edit
A more efficient and proper version was posted by #Dustin in the comments, I'm adding it here for completeness sake:
func parseLocation(file string) (map[string]*Point, error) {
f, err := os.Open(file)
if err != nil {
return nil, err
}
defer f.Close()
csvr := csv.NewReader(f)
locations := map[string]*Point{}
for {
row, err := csvr.Read()
if err != nil {
if err == io.EOF {
err = nil
}
return locations, err
}
p := &Point{}
if p.lat, err = strconv.ParseFloat(row[1], 64); err != nil {
return nil, err
}
if p.lon, err = strconv.ParseFloat(row[2], 64); err != nil {
return nil, err
}
locations[row[0]] = p
}
}
playground
I basically copied my answer from here: https://www.dotnetperls.com/csv-go. For me, this was a better answer than what I found on stackoverflow.
import (
"bufio"
"encoding/csv"
"os"
"fmt"
"io"
)
func ReadCsvFile(filePath string) {
// Load a csv file.
f, _ := os.Open(filePath)
// Create a new reader.
r := csv.NewReader(f)
for {
record, err := r.Read()
// Stop at EOF.
if err == io.EOF {
break
}
if err != nil {
panic(err)
}
// Display record.
// ... Display record length.
// ... Display all individual elements of the slice.
fmt.Println(record)
fmt.Println(len(record))
for value := range record {
fmt.Printf(" %v\n", record[value])
}
}
}
I also dislike the verbosity of the default Reader, so I made a new type that is
similar to bufio#Scanner:
package main
import "encoding/csv"
import "io"
type Scanner struct {
Reader *csv.Reader
Head map[string]int
Row []string
}
func NewScanner(o io.Reader) Scanner {
csv_o := csv.NewReader(o)
a, e := csv_o.Read()
if e != nil {
return Scanner{}
}
m := map[string]int{}
for n, s := range a {
m[s] = n
}
return Scanner{Reader: csv_o, Head: m}
}
func (o *Scanner) Scan() bool {
a, e := o.Reader.Read()
o.Row = a
return e == nil
}
func (o Scanner) Text(s string) string {
return o.Row[o.Head[s]]
}
Example:
package main
import "strings"
func main() {
s := `Month,Day
January,Sunday
February,Monday`
o := NewScanner(strings.NewReader(s))
for o.Scan() {
println(o.Text("Month"), o.Text("Day"))
}
}
https://golang.org/pkg/encoding/csv
You can also read contents of a directory to load all the CSV files. And then read all those CSV files 1 by 1 with goroutines
csv file:
101,300.00,11000901,1155686400
102,250.99,11000902,1432339200
main.go file:
const sourcePath string = "./source"
func main() {
dir, _ := os.Open(sourcePath)
files, _ := dir.Readdir(-1)
for _, file := range files {
fmt.Println("SINGLE FILE: ")
fmt.Println(file.Name())
filePath := sourcePath + "/" + file.Name()
f, _ := os.Open(filePath)
defer f.Close()
// os.Remove(filePath)
//func
go func(file io.Reader) {
records, _ := csv.NewReader(file).ReadAll()
for _, row := range records {
fmt.Println(row)
}
}(f)
time.Sleep(10 * time.Millisecond)// give some time to GO routines for execute
}
}
And the OUTPUT will be:
$ go run main.go
SINGLE FILE:
batch01.csv
[101 300.00 11000901 1155686400]
[102 250.99 11000902 1432339200]
----------------- -------------- ---------------------- -------
---------------- ------------------- ----------- --------------
Below example with the Invoice struct
func main() {
dir, _ := os.Open(sourcePath)
files, _ := dir.Readdir(-1)
for _, file := range files {
fmt.Println("SINGLE FILE: ")
fmt.Println(file.Name())
filePath := sourcePath + "/" + file.Name()
f, _ := os.Open(filePath)
defer f.Close()
go func(file io.Reader) {
records, _ := csv.NewReader(file).ReadAll()
for _, row := range records {
invoice := new(Invoice)
invoice.InvoiceNumber = row[0]
invoice.Amount, _ = strconv.ParseFloat(row[1], 64)
invoice.OrderID, _ = strconv.Atoi(row[2])
unixTime, _ := strconv.ParseInt(row[3], 10, 64)
invoice.Date = time.Unix(unixTime, 0)
fmt.Printf("Received invoice `%v` for $ %.2f \n", invoice.InvoiceNumber, invoice.Amount)
}
}(f)
time.Sleep(10 * time.Millisecond)
}
}
type Invoice struct {
InvoiceNumber string
Amount float64
OrderID int
Date time.Time
}