rpc/cli: implement contract deployment, fix #474

It's used like this:
./bin/neo-go contract deploy -i 1-print.avm -c neo-go.yml -e http://localhost:20331 -w KxDgvEKzgSBPPfuVfw67oPQBSjidEiqTHURKSDL1R7yGaGYAeYnr -g 100

cli/smartcontract/smart_contract.go

@@ -11,7 +11,10 @@ import (
 	"os"
 	"path/filepath"
 
+	"github.com/CityOfZion/neo-go/pkg/crypto/hash"
+	"github.com/CityOfZion/neo-go/pkg/crypto/keys"
 	"github.com/CityOfZion/neo-go/pkg/rpc"
+	"github.com/CityOfZion/neo-go/pkg/util"
 	"github.com/CityOfZion/neo-go/pkg/vm"
 	"github.com/CityOfZion/neo-go/pkg/vm/compiler"
 	"github.com/go-yaml/yaml"
@@ -22,6 +25,8 @@ import (
 var (
 	errNoEndpoint          = errors.New("no RPC endpoint specified, use option '--endpoint' or '-e'")
 	errNoInput             = errors.New("no input file was found, specify an input file with the '--in or -i' flag")
+	errNoConfFile          = errors.New("no config file was found, specify a config file with the '--config' or '-c' flag")
+	errNoWIF               = errors.New("no WIF parameter found, specify it with the '--wif or -w' flag")
 	errNoSmartContractName = errors.New("no name was provided, specify the '--name or -n' flag")
 	errFileExist           = errors.New("A file with given smart-contract name already exists")
 )
@@ -63,6 +68,33 @@ func NewCommands() []cli.Command {
 					},
 				},
 			},
+			{
+				Name:   "deploy",
+				Usage:  "deploy a smart contract (.avm with description)",
+				Action: contractDeploy,
+				Flags: []cli.Flag{
+					cli.StringFlag{
+						Name:  "in, i",
+						Usage: "Input file for the smart contract (*.avm)",
+					},
+					cli.StringFlag{
+						Name:  "config, c",
+						Usage: "configuration input file (*.yml)",
+					},
+					cli.StringFlag{
+						Name:  "endpoint, e",
+						Usage: "RPC endpoint address (like 'http://seed4.ngd.network:20332')",
+					},
+					cli.StringFlag{
+						Name:  "wif, w",
+						Usage: "key to sign deployed transaction (in wif format)",
+					},
+					cli.IntFlag{
+						Name:  "gas, g",
+						Usage: "gas to pay for contract deployment",
+					},
+				},
+			},
 			{
 				Name:   "testinvoke",
 				Usage:  "Test an invocation of a smart contract on the blockchain",
@@ -218,25 +250,11 @@ func testInvoke(ctx *cli.Context) error {
 // ProjectConfig contains project metadata.
 type ProjectConfig struct {
 	Version  uint
-	Contract ContractDetails `yaml:"project"`
+	Contract rpc.ContractDetails `yaml:"project"`
 }
 
-// ContractDetails contains contract metadata.
-type ContractDetails struct {
-	Author               string
-	Email                string
-	Version              string
-	ProjectName          string `yaml:"name"`
-	Description          string
-	HasStorage           bool
-	HasDynamicInvocation bool
-	IsPayable            bool
-	ReturnType           rpc.StackParamType
-	Parameters           []rpc.StackParamType
-}
-
-func parseContractDetails() ContractDetails {
-	details := ContractDetails{}
+func parseContractDetails() rpc.ContractDetails {
+	details := rpc.ContractDetails{}
 	reader := bufio.NewReader(os.Stdin)
 
 	fmt.Print("Author: ")
@@ -279,3 +297,55 @@ func inspect(ctx *cli.Context) error {
 
 	return nil
 }
+
+// contractDeploy deploys contract.
+func contractDeploy(ctx *cli.Context) error {
+	in := ctx.String("in")
+	if len(in) == 0 {
+		return cli.NewExitError(errNoInput, 1)
+	}
+	confFile := ctx.String("config")
+	if len(confFile) == 0 {
+		return cli.NewExitError(errNoConfFile, 1)
+	}
+	endpoint := ctx.String("endpoint")
+	if len(endpoint) == 0 {
+		return cli.NewExitError(errNoEndpoint, 1)
+	}
+	wifStr := ctx.String("wif")
+	if len(wifStr) == 0 {
+		return cli.NewExitError(errNoWIF, 1)
+	}
+	gas := util.Fixed8FromInt64(int64(ctx.Int("gas")))
+
+	wif, err := keys.WIFDecode(wifStr, 0)
+	if err != nil {
+		return cli.NewExitError(fmt.Errorf("bad wif: %v", err), 1)
+	}
+	avm, err := ioutil.ReadFile(in)
+	if err != nil {
+		return cli.NewExitError(err, 1)
+	}
+	confBytes, err := ioutil.ReadFile(confFile)
+	if err != nil {
+		return cli.NewExitError(err, 1)
+	}
+
+	conf := ProjectConfig{}
+	err = yaml.Unmarshal(confBytes, &conf)
+	if err != nil {
+		return cli.NewExitError(fmt.Errorf("bad config: %v", err), 1)
+	}
+
+	client, err := rpc.NewClient(context.TODO(), endpoint, rpc.ClientOptions{})
+	if err != nil {
+		return cli.NewExitError(err, 1)
+	}
+
+	txHash, err := client.DeployContract(avm, &conf.Contract, wif, gas)
+	if err != nil {
+		return cli.NewExitError(fmt.Errorf("failed to deploy: %v", err), 1)
+	}
+	fmt.Printf("Sent deployment transaction %s for contract %s\n", txHash.ReverseString(), hash.Hash160(avm).ReverseString())
+	return nil
+}

pkg/rpc/rpc.go

@@ -2,9 +2,10 @@ package rpc
 
 import (
 	"encoding/hex"
+	"fmt"
 
 	"github.com/CityOfZion/neo-go/pkg/core/transaction"
-	"github.com/CityOfZion/neo-go/pkg/io"
+	"github.com/CityOfZion/neo-go/pkg/crypto/keys"
 	"github.com/CityOfZion/neo-go/pkg/smartcontract"
 	"github.com/CityOfZion/neo-go/pkg/util"
 	"github.com/pkg/errors"
@@ -108,9 +109,9 @@ func (c *Client) Invoke(script string, params []smartcontract.Parameter) (*Invok
 // The given hex string needs to be signed with a keypair.
 // When the result of the response object is true, the TX has successfully
 // been broadcasted to the network.
-func (c *Client) sendRawTransaction(rawTX string) (*response, error) {
+func (c *Client) sendRawTransaction(rawTX *transaction.Transaction) (*response, error) {
 	var (
-		params = newParams(rawTX)
+		params = newParams(hex.EncodeToString(rawTX.Bytes()))
 		resp   = &response{}
 	)
 	if err := c.performRequest("sendrawtransaction", params, resp); err != nil {
@@ -125,9 +126,7 @@ func (c *Client) sendRawTransaction(rawTX string) (*response, error) {
 func (c *Client) SendToAddress(asset util.Uint256, address string, amount util.Fixed8) (*SendToAddressResponse, error) {
 	var (
 		err      error
-		buf      = io.NewBufBinWriter()
 		rawTx    *transaction.Transaction
-		rawTxStr string
 		txParams = ContractTxParams{
 			assetID:  asset,
 			address:  address,
@@ -142,12 +141,7 @@ func (c *Client) SendToAddress(asset util.Uint256, address string, amount util.F
 	if rawTx, err = CreateRawContractTransaction(txParams); err != nil {
 		return nil, errors.Wrap(err, "failed to create raw transaction for `sendtoaddress`")
 	}
-	rawTx.EncodeBinary(buf.BinWriter)
-	if buf.Err != nil {
-		return nil, errors.Wrap(buf.Err, "failed to encode raw transaction to binary for `sendtoaddress`")
-	}
-	rawTxStr = hex.EncodeToString(buf.Bytes())
-	if resp, err = c.sendRawTransaction(rawTxStr); err != nil {
+	if resp, err = c.sendRawTransaction(rawTx); err != nil {
 		return nil, errors.Wrap(err, "failed to send raw transaction")
 	}
 	response.Error = resp.Error
@@ -158,3 +152,39 @@ func (c *Client) SendToAddress(asset util.Uint256, address string, amount util.F
 	}
 	return response, nil
 }
+
+// DeployContract deploys given contract to the blockchain using given wif to
+// sign the transaction and spending the amount of gas specified. It returns
+// a hash of the deployment transaction and an error.
+func (c *Client) DeployContract(avm []byte, contract *ContractDetails, wif *keys.WIF, gas util.Fixed8) (util.Uint256, error) {
+	var txHash util.Uint256
+
+	gasIDB, _ := hex.DecodeString("602c79718b16e442de58778e148d0b1084e3b2dffd5de6b7b16cee7969282de7")
+	gasID, _ := util.Uint256DecodeReverseBytes(gasIDB)
+
+	txScript, err := CreateDeploymentScript(avm, contract)
+	if err != nil {
+		return txHash, errors.Wrap(err, "failed creating deployment script")
+	}
+	tx := transaction.NewInvocationTX(txScript, gas)
+
+	fromAddress := wif.PrivateKey.Address()
+
+	if err = AddInputsAndUnspentsToTx(tx, fromAddress, gasID, gas, c); err != nil {
+		return txHash, errors.Wrap(err, "failed to add inputs and unspents to transaction")
+	}
+
+	if err = SignTx(tx, wif); err != nil {
+		return txHash, errors.Wrap(err, "failed to sign tx")
+	}
+	txHash = tx.Hash()
+	resp, err := c.sendRawTransaction(tx)
+
+	if err != nil {
+		return txHash, errors.Wrap(err, "failed sendning tx")
+	}
+	if resp.Error != nil {
+		return txHash, fmt.Errorf("remote returned %d: %s", resp.Error.Code, resp.Error.Message)
+	}
+	return txHash, nil
+}

pkg/rpc/scdetails.go

@@ -0,0 +1,15 @@
+package rpc
+
+// ContractDetails contains contract metadata.
+type ContractDetails struct {
+	Author               string
+	Email                string
+	Version              string
+	ProjectName          string `yaml:"name"`
+	Description          string
+	HasStorage           bool
+	HasDynamicInvocation bool
+	IsPayable            bool
+	ReturnType           StackParamType
+	Parameters           []StackParamType
+}

pkg/rpc/txBuilder.go

@@ -1,11 +1,15 @@
 package rpc
 
 import (
+	"bytes"
+
 	"github.com/CityOfZion/neo-go/pkg/core/transaction"
 	"github.com/CityOfZion/neo-go/pkg/crypto"
 	"github.com/CityOfZion/neo-go/pkg/crypto/keys"
 	"github.com/CityOfZion/neo-go/pkg/io"
+	"github.com/CityOfZion/neo-go/pkg/smartcontract"
 	"github.com/CityOfZion/neo-go/pkg/util"
+	"github.com/CityOfZion/neo-go/pkg/vm"
 	errs "github.com/pkg/errors"
 )
 
@@ -106,3 +110,55 @@ func GetInvocationScript(tx *transaction.Transaction, wif *keys.WIF) ([]byte, er
 	}
 	return append([]byte{pushbytes64}, signature...), nil
 }
+
+// CreateDeploymentScript returns a script that deploys given smart contract
+// with its metadata.
+func CreateDeploymentScript(avm []byte, contract *ContractDetails) ([]byte, error) {
+	var props smartcontract.PropertyState
+
+	script := new(bytes.Buffer)
+	if err := vm.EmitBytes(script, []byte(contract.Description)); err != nil {
+		return nil, err
+	}
+	if err := vm.EmitBytes(script, []byte(contract.Email)); err != nil {
+		return nil, err
+	}
+	if err := vm.EmitBytes(script, []byte(contract.Author)); err != nil {
+		return nil, err
+	}
+	if err := vm.EmitBytes(script, []byte(contract.Version)); err != nil {
+		return nil, err
+	}
+	if err := vm.EmitBytes(script, []byte(contract.ProjectName)); err != nil {
+		return nil, err
+	}
+	if contract.HasStorage {
+		props |= smartcontract.HasStorage
+	}
+	if contract.HasDynamicInvocation {
+		props |= smartcontract.HasDynamicInvoke
+	}
+	if contract.IsPayable {
+		props |= smartcontract.IsPayable
+	}
+	if err := vm.EmitInt(script, int64(props)); err != nil {
+		return nil, err
+	}
+	if err := vm.EmitInt(script, int64(contract.ReturnType)); err != nil {
+		return nil, err
+	}
+	params := make([]byte, len(contract.Parameters))
+	for k := range contract.Parameters {
+		params[k] = byte(contract.Parameters[k])
+	}
+	if err := vm.EmitBytes(script, params); err != nil {
+		return nil, err
+	}
+	if err := vm.EmitBytes(script, avm); err != nil {
+		return nil, err
+	}
+	if err := vm.EmitSyscall(script, "Neo.Contract.Create"); err != nil {
+		return nil, err
+	}
+	return script.Bytes(), nil
+}