Golang common.FromHex函数代码示例

// Post injects a message into the whisper network for distribution.
func (self *Whisper) Post(payload string, to, from string, topics []string, priority, ttl uint32) error {
	// Decode the topic strings
	topicsDecoded := make([][]byte, len(topics))
	for i, topic := range topics {
		topicsDecoded[i] = common.FromHex(topic)
	}
	// Construct the whisper message and transmission options
	message := whisper.NewMessage(common.FromHex(payload))
	options := whisper.Options{
		To:     crypto.ToECDSAPub(common.FromHex(to)),
		TTL:    time.Duration(ttl) * time.Second,
		Topics: whisper.NewTopics(topicsDecoded...),
	}
	if len(from) != 0 {
		if key := self.Whisper.GetIdentity(crypto.ToECDSAPub(common.FromHex(from))); key != nil {
			options.From = key
		} else {
			return fmt.Errorf("unknown identity to send from: %s", from)
		}
	}
	// Wrap and send the message
	pow := time.Duration(priority) * time.Millisecond
	envelope, err := message.Wrap(pow, options)
	if err != nil {
		return err
	}
	if err := self.Whisper.Send(envelope); err != nil {
		return err
	}
	return nil
}

// NewWhisperFilter creates and registers a new message filter to watch for inbound whisper messages.
func (s *PublicWhisperAPI) NewFilter(args NewFilterArgs) (*rpc.HexNumber, error) {
	if s.w == nil {
		return nil, whisperOffLineErr
	}

	var id int
	filter := Filter{
		To:     crypto.ToECDSAPub(common.FromHex(args.To)),
		From:   crypto.ToECDSAPub(common.FromHex(args.From)),
		Topics: NewFilterTopics(args.Topics...),
		Fn: func(message *Message) {
			wmsg := NewWhisperMessage(message)
			s.messagesMu.RLock() // Only read lock to the filter pool
			defer s.messagesMu.RUnlock()
			if s.messages[id] != nil {
				s.messages[id].insert(wmsg)
			}
		},
	}

	id = s.w.Watch(filter)

	s.messagesMu.Lock()
	s.messages[id] = newWhisperFilter(id, s.w)
	s.messagesMu.Unlock()

	return rpc.NewHexNumber(id), nil
}

// Post injects a message into the whisper network for distribution.
func (s *PublicWhisperAPI) Post(args PostArgs) (bool, error) {
	if s.w == nil {
		return false, whisperOffLineErr
	}

	// construct whisper message with transmission options
	message := NewMessage(common.FromHex(args.Payload))
	options := Options{
		To:     crypto.ToECDSAPub(common.FromHex(args.To)),
		TTL:    time.Duration(args.TTL) * time.Second,
		Topics: NewTopics(args.Topics...),
	}

	// set sender identity
	if len(args.From) > 0 {
		if key := s.w.GetIdentity(crypto.ToECDSAPub(common.FromHex(args.From))); key != nil {
			options.From = key
		} else {
			return false, fmt.Errorf("unknown identity to send from: %s", args.From)
		}
	}

	// Wrap and send the message
	pow := time.Duration(args.Priority) * time.Millisecond
	envelope, err := message.Wrap(pow, options)
	if err != nil {
		return false, err
	}

	return true, s.w.Send(envelope)
}

func checkLogs(tlog []Log, logs vm.Logs) error {

	if len(tlog) != len(logs) {
		return fmt.Errorf("log length mismatch. Expected %d, got %d", len(tlog), len(logs))
	} else {
		for i, log := range tlog {
			if common.HexToAddress(log.AddressF) != logs[i].Address {
				return fmt.Errorf("log address expected %v got %x", log.AddressF, logs[i].Address)
			}

			if !bytes.Equal(logs[i].Data, common.FromHex(log.DataF)) {
				return fmt.Errorf("log data expected %v got %x", log.DataF, logs[i].Data)
			}

			if len(log.TopicsF) != len(logs[i].Topics) {
				return fmt.Errorf("log topics length expected %d got %d", len(log.TopicsF), logs[i].Topics)
			} else {
				for j, topic := range log.TopicsF {
					if common.HexToHash(topic) != logs[i].Topics[j] {
						return fmt.Errorf("log topic[%d] expected %v got %x", j, topic, logs[i].Topics[j])
					}
				}
			}
			genBloom := common.LeftPadBytes(types.LogsBloom(vm.Logs{logs[i]}).Bytes(), 256)

			if !bytes.Equal(genBloom, common.Hex2Bytes(log.BloomF)) {
				return fmt.Errorf("bloom mismatch")
			}
		}
	}
	return nil
}

func TestNull(t *testing.T) {
	var trie Trie
	key := make([]byte, 32)
	value := common.FromHex("0x823140710bf13990e4500136726d8b55")
	trie.Update(key, value)
	value = trie.Get(key)
}

func (args *DbHexArgs) UnmarshalJSON(b []byte) (err error) {
	var obj []interface{}
	if err := json.Unmarshal(b, &obj); err != nil {
		return shared.NewDecodeParamError(err.Error())
	}

	if len(obj) < 2 {
		return shared.NewInsufficientParamsError(len(obj), 2)
	}

	var objstr string
	var ok bool

	if objstr, ok = obj[0].(string); !ok {
		return shared.NewInvalidTypeError("database", "not a string")
	}
	args.Database = objstr

	if objstr, ok = obj[1].(string); !ok {
		return shared.NewInvalidTypeError("key", "not a string")
	}
	args.Key = objstr

	if len(obj) > 2 {
		objstr, ok = obj[2].(string)
		if !ok {
			return shared.NewInvalidTypeError("value", "not a string")
		}

		args.Value = common.FromHex(objstr)
	}

	return nil
}

func TestLoadECDSAFile(t *testing.T) {
	keyBytes := common.FromHex(testPrivHex)
	fileName0 := "test_key0"
	fileName1 := "test_key1"
	checkKey := func(k *ecdsa.PrivateKey) {
		checkAddr(t, PubkeyToAddress(k.PublicKey), common.HexToAddress(testAddrHex))
		loadedKeyBytes := FromECDSA(k)
		if !bytes.Equal(loadedKeyBytes, keyBytes) {
			t.Fatalf("private key mismatch: want: %x have: %x", keyBytes, loadedKeyBytes)
		}
	}

	ioutil.WriteFile(fileName0, []byte(testPrivHex), 0600)
	defer os.Remove(fileName0)

	key0, err := LoadECDSA(fileName0)
	if err != nil {
		t.Fatal(err)
	}
	checkKey(key0)

	// again, this time with SaveECDSA instead of manual save:
	err = SaveECDSA(fileName1, key0)
	if err != nil {
		t.Fatal(err)
	}
	defer os.Remove(fileName1)

	key1, err := LoadECDSA(fileName1)
	if err != nil {
		t.Fatal(err)
	}
	checkKey(key1)
}

func (args *PostArgs) UnmarshalJSON(data []byte) (err error) {
	var obj struct {
		From     string        `json:"from"`
		To       string        `json:"to"`
		Topics   []string      `json:"topics"`
		Payload  string        `json:"payload"`
		Priority rpc.HexNumber `json:"priority"`
		TTL      rpc.HexNumber `json:"ttl"`
	}

	if err := json.Unmarshal(data, &obj); err != nil {
		return err
	}

	args.From = obj.From
	args.To = obj.To
	args.Payload = obj.Payload
	args.Priority = obj.Priority.Int64()
	args.TTL = obj.TTL.Int64()

	// decode topic strings
	args.Topics = make([][]byte, len(obj.Topics))
	for i, topic := range obj.Topics {
		args.Topics[i] = common.FromHex(topic)
	}

	return nil
}

func (self *XEth) PushTx(encodedTx string) (string, error) {
	tx := new(types.Transaction)
	err := rlp.DecodeBytes(common.FromHex(encodedTx), tx)
	if err != nil {
		glog.V(logger.Error).Infoln(err)
		return "", err
	}

	err = self.backend.TxPool().Add(tx)
	if err != nil {
		return "", err
	}

	if tx.To() == nil {
		from, err := tx.From()
		if err != nil {
			return "", err
		}

		addr := crypto.CreateAddress(from, tx.Nonce())
		glog.V(logger.Info).Infof("Tx(%x) created: %x\n", tx.Hash(), addr)
	} else {
		glog.V(logger.Info).Infof("Tx(%x) to: %x\n", tx.Hash(), tx.To())
	}

	return tx.Hash().Hex(), nil
}

func (self *XEth) FromNumber(str string) string {
	if common.IsHex(str) {
		str = str[2:]
	}

	return common.BigD(common.FromHex(str)).String()
}

func (self *XEth) FromAscii(str string) string {
	if common.IsHex(str) {
		str = str[2:]
	}

	return string(bytes.Trim(common.FromHex(str), "\x00"))
}

func RunState(statedb *state.StateDB, env, tx map[string]string) ([]byte, vm.Logs, *big.Int, error) {
	var (
		data  = common.FromHex(tx["data"])
		gas   = common.Big(tx["gasLimit"])
		price = common.Big(tx["gasPrice"])
		value = common.Big(tx["value"])
		nonce = common.Big(tx["nonce"]).Uint64()
	)

	var to *common.Address
	if len(tx["to"]) > 2 {
		t := common.HexToAddress(tx["to"])
		to = &t
	}
	// Set pre compiled contracts
	vm.Precompiled = vm.PrecompiledContracts()
	vm.Debug = false
	snapshot := statedb.Copy()
	gaspool := new(core.GasPool).AddGas(common.Big(env["currentGasLimit"]))

	key, _ := hex.DecodeString(tx["secretKey"])
	addr := crypto.PubkeyToAddress(crypto.ToECDSA(key).PublicKey)
	message := NewMessage(addr, to, data, value, gas, price, nonce)
	vmenv := NewEnvFromMap(statedb, env, tx)
	vmenv.origin = addr
	ret, _, err := core.ApplyMessage(vmenv, message, gaspool)
	if core.IsNonceErr(err) || core.IsInvalidTxErr(err) || core.IsGasLimitErr(err) {
		statedb.Set(snapshot)
	}
	statedb.Commit()

	return ret, vmenv.state.Logs(), vmenv.Gas, err
}

// ContractCall implements ContractCaller.ContractCall, delegating the execution of
// a contract call to the remote node, returning the reply to for local processing.
func (b *rpcBackend) ContractCall(contract common.Address, data []byte, pending bool) ([]byte, error) {
	// Pack up the request into an RPC argument
	args := struct {
		To   common.Address `json:"to"`
		Data string         `json:"data"`
	}{
		To:   contract,
		Data: common.ToHex(data),
	}
	// Execute the RPC call and retrieve the response
	block := "latest"
	if pending {
		block = "pending"
	}
	res, err := b.request("exp_call", []interface{}{args, block})
	if err != nil {
		return nil, err
	}
	var hex string
	if err := json.Unmarshal(res, &hex); err != nil {
		return nil, err
	}
	// Convert the response back to a Go byte slice and return
	return common.FromHex(hex), nil
}

// Calculates the sha3 over req.Params.Data
func (self *web3Api) Sha3(req *shared.Request) (interface{}, error) {
	args := new(Sha3Args)
	if err := self.codec.Decode(req.Params, &args); err != nil {
		return nil, err
	}

	return common.ToHex(crypto.Sha3(common.FromHex(args.Data))), nil
}

// HasCode implements bind.ContractVerifier.HasCode by retrieving any code associated
// with the contract from the local API, and checking its size.
func (b *ContractBackend) HasCode(contract common.Address, pending bool) (bool, error) {
	block := rpc.LatestBlockNumber
	if pending {
		block = rpc.PendingBlockNumber
	}
	out, err := b.bcapi.GetCode(contract, block)
	return len(common.FromHex(out)) > 0, err
}