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65 lines
1.8 KiB
65 lines
1.8 KiB
package main
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import (
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"context"
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"fmt"
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"math/big"
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"time"
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"github.com/ethereum/go-ethereum/rpc"
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"github.com/harmony-one/harmony/hmyclient"
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)
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// newRPCClient creates a rpc client with specified node URL.
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func newRPCClient(url string) *rpc.Client {
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client, err := rpc.Dial(url)
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if err != nil {
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fmt.Errorf("Failed to connect to Ethereum node: %v", err)
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}
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return client
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}
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func main() {
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ctx, cancelFn := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancelFn()
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rpcClient := newRPCClient("http://localhost:9500")
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if rpcClient == nil {
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fmt.Errorf("Failed to create rpc client")
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}
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client := hmyclient.NewClient(rpcClient)
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if client == nil {
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fmt.Errorf("Failed to create client")
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}
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networkID, err := client.NetworkID(ctx)
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if err != nil {
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fmt.Errorf("Failed to get net_version: %v", err)
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}
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fmt.Printf("net_version: %v\n", networkID)
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blockNumber, err := client.BlockNumber(ctx)
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if err != nil {
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fmt.Errorf("Failed to get hmy_blockNumber: %v", err)
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}
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fmt.Printf("hmy_blockNumber: %v\n", blockNumber)
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block, err := client.BlockByNumber(ctx, new(big.Int).SetUint64(uint64(blockNumber)))
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if err != nil {
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fmt.Errorf("Failed to get hmy_getBlockByNumber %v: %v", blockNumber, err)
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}
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fmt.Printf("hmy_getBlockByNumber(%v):\n", blockNumber)
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fmt.Printf("number: %v\n", block.Number().Text(16))
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fmt.Printf("hash: %v\n", block.Hash().String())
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fmt.Printf("parentHash: %v\n", block.ParentHash().String())
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fmt.Printf("timestamp: %v\n", block.Time().Text(16))
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fmt.Printf("size: %v\n", block.Size())
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fmt.Printf("miner: %v\n", block.Coinbase().String())
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fmt.Printf("receiptsRoot: %v\n", block.ReceiptHash().String())
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fmt.Printf("transactionsRoot: %v\n", block.TxHash().String())
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block, err = client.BlockByNumber(ctx, nil)
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if err != nil {
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fmt.Errorf("Failed to get block: %v", err)
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}
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fmt.Printf("hmy_getBlockByNumber(latest): %v", block)
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}
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