/
main.go
184 lines (146 loc) · 3.42 KB
/
main.go
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package main
import (
"context"
"flag"
"fmt"
"log"
"math/big"
"os"
"sort"
"time"
"github.com/ofen/getblock-go/eth"
"golang.org/x/sync/errgroup"
)
var (
n = flag.Int("n", 100, "")
t = flag.String("t", "", "")
v = flag.Bool("v", false, "")
)
const usage = `Usage: wtop [options...] [<block_number>]
Options:
-n Number of look-behind blocks. Should be between 1 and 500. Default is 100.
-t API token (see https://getblock.io/docs/get-started/auth-with-api-key/).
-v Verbose output.
`
func main() {
flag.Usage = func() {
fmt.Fprint(os.Stderr, usage)
}
flag.Parse()
blockNumber := new(big.Int)
if flag.NArg() > 0 {
if _, ok := blockNumber.SetString(flag.Arg(0), 10); !ok {
usageAndExit("block number should be decimal integer")
}
if blockNumber.Cmp(big.NewInt(0)) < 0 {
usageAndExit("block number should be positive decimal integer")
}
}
if *t == "" {
usageAndExit("api token required")
}
if *n < 1 {
usageAndExit("-n is too low")
}
if *n > 500 {
usageAndExit("-n is too high")
}
ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
defer cancel()
client := eth.New(*t, nil)
head, err := client.BlockNumber(ctx)
if err != nil {
log.Fatal(err)
}
// Use head if block number not provided
if flag.NArg() < 1 {
blockNumber = new(big.Int).Set(head)
}
if blockNumber.Cmp(head) > 0 {
usageAndExit(fmt.Sprintf("block number is out of range: %d", blockNumber))
}
wallets, err := listWallets(ctx, client, *n, blockNumber)
if err != nil {
log.Fatal(err)
}
lessBlockNumber := new(big.Int).Set(blockNumber)
lessBlockNumber.Sub(lessBlockNumber, big.NewInt(int64(*n)))
log.Printf("blocks %v..%v\n", lessBlockNumber, blockNumber)
if len(wallets) < 1 {
log.Println("there are no transactions")
return
}
sortWallets(wallets)
min := wallets[0]
max := wallets[len(wallets)-1]
log.Printf("%+f ETH %s\n", eth.Wei2ether(max.amount), max.address)
log.Printf("%+f ETH %s\n", eth.Wei2ether(min.amount), min.address)
}
func listWallets(ctx context.Context, client *eth.Client, numberOfBlocks int, blockNumber *big.Int) ([]*wallet, error) {
g, ctx := errgroup.WithContext(ctx)
bn := new(big.Int).Set(blockNumber)
ch := make(chan eth.Transaction)
for i := 0; i < numberOfBlocks; i++ {
g.Go(func() error {
b, err := client.GetBlockByNumber(ctx, bn, true)
if err != nil {
return err
}
for _, t := range b.Transactions {
if *v {
log.Printf("%f ETH %s -> %s", eth.Wei2ether(t.Value), t.From, t.To)
}
ch <- t
}
return nil
})
bn.Sub(bn, big.NewInt(1))
// stop if it's last block
if bn.Cmp(big.NewInt(0)) == 0 {
break
}
}
go func() {
g.Wait()
close(ch)
}()
m := make(map[string]*big.Int)
for t := range ch {
v, ok := m[t.From]
if !ok {
v = new(big.Int)
}
m[t.From] = v.Sub(v, t.Value)
v, ok = m[t.To]
if !ok {
v = new(big.Int)
}
m[t.To] = v.Add(v, t.Value)
}
wallets := make([]*wallet, 0, len(m))
for k, v := range m {
wallets = append(wallets, &wallet{address: k, amount: v})
}
return wallets, g.Wait()
}
type wallet struct {
address string
amount *big.Int
}
func sortWallets(x []*wallet) {
sort.Slice(x, func(i, j int) bool {
if r := x[i].amount.Cmp(x[j].amount); r < 0 {
return true
}
return false
})
}
func usageAndExit(msg string) {
if msg != "" {
fmt.Fprintf(os.Stderr, msg)
fmt.Fprintf(os.Stderr, "\n\n")
}
flag.Usage()
fmt.Fprintf(os.Stderr, "\n")
os.Exit(2)
}