neoneo-go/pkg/vm/cli/cli.go

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package cli
import (
"bytes"
"encoding/base64"
"encoding/hex"
"errors"
"fmt"
"io/ioutil"
"math/big"
"os"
"strconv"
"strings"
"text/tabwriter"
"github.com/nspcc-dev/neo-go/pkg/compiler"
"github.com/nspcc-dev/neo-go/pkg/encoding/address"
"github.com/nspcc-dev/neo-go/pkg/encoding/bigint"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
"gopkg.in/abiosoft/ishell.v2"
)
const (
vmKey = "vm"
boolType = "bool"
boolFalse = "false"
boolTrue = "true"
intType = "int"
stringType = "string"
)
var commands = []*ishell.Cmd{
{
Name: "exit",
Help: "Exit the VM prompt",
LongHelp: "Exit the VM prompt",
Func: handleExit,
},
{
Name: "ip",
Help: "Show current instruction",
LongHelp: "Show current instruction",
Func: handleIP,
},
{
Name: "break",
Help: "Place a breakpoint",
LongHelp: `Usage: break <ip>
<ip> is mandatory parameter, example:
> break 12`,
Func: handleBreak,
},
{
Name: "estack",
Help: "Show evaluation stack contents",
LongHelp: "Show evaluation stack contents",
Func: handleXStack,
},
{
Name: "astack",
Help: "Show alt stack contents",
LongHelp: "Show alt stack contents",
Func: handleXStack,
},
{
Name: "istack",
Help: "Show invocation stack contents",
LongHelp: "Show invocation stack contents",
Func: handleXStack,
},
{
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Name: "loadnef",
Help: "Load a NEF-consistent script into the VM",
LongHelp: `Usage: loadnef <file>
<file> is mandatory parameter, example:
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> loadnef /path/to/script.nef`,
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Func: handleLoadNEF,
},
{
Name: "loadbase64",
Help: "Load a base64-encoded script string into the VM",
LongHelp: `Usage: loadbase64 <string>
<string> is mandatory parameter, example:
> loadbase64 AwAQpdToAAAADBQV9ehtQR1OrVZVhtHtoUHRfoE+agwUzmFvf3Rhfg/EuAVYOvJgKiON9j8TwAwIdHJhbnNmZXIMFDt9NxHG8Mz5sdypA9G/odiW8SOMQWJ9W1I4`,
Func: handleLoadBase64,
},
{
Name: "loadhex",
Help: "Load a hex-encoded script string into the VM",
LongHelp: `Usage: loadhex <string>
<string> is mandatory parameter, example:
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> loadhex 0c0c48656c6c6f20776f726c6421`,
Func: handleLoadHex,
},
{
Name: "loadgo",
Help: "Compile and load a Go file into the VM",
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LongHelp: `Usage: loadgo <file>
<file> is mandatory parameter, example:
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> loadgo /path/to/file.go`,
Func: handleLoadGo,
},
{
Name: "parse",
Help: "Parse provided argument and convert it into other possible formats",
LongHelp: `Usage: parse <arg>
<arg> is an argument which is tried to be interpreted as an item of different types
and converted to other formats. Strings are escaped and output in quotes.`,
Func: handleParse,
},
{
Name: "run",
Help: "Execute the current loaded script",
LongHelp: `Usage: run [<operation> [<parameter>...]]
<operation> is an operation name, passed as a first parameter to Main() (and it
can't be 'help' at the moment)
<parameter> is a parameter (can be repeated multiple times) that can be specified
as <type>:<value>, where type can be:
'` + boolType + `': supports '` + boolFalse + `' and '` + boolTrue + `' values
'` + intType + `': supports integers as values
'` + stringType + `': supports strings as values (that are pushed as a byte array
values to the stack)
or can be just <value>, for which the type will be detected automatically
following these rules: '` + boolTrue + `' and '` + boolFalse + `' are treated as respective
boolean values, everything that can be converted to integer is treated as
integer and everything else is treated like a string.
Passing parameters without operation is not supported. Parameters are packed
into array before they're passed to the script, so effectively 'run' only
supports contracts with signatures like this:
func Main(operation string, args []interface{}) interface{}
Example:
> run put ` + stringType + `:"Something to put"`,
Func: handleRun,
},
{
Name: "cont",
Help: "Continue execution of the current loaded script",
LongHelp: "Continue execution of the current loaded script",
Func: handleCont,
},
{
Name: "step",
Help: "Step (n) instruction in the program",
LongHelp: `Usage: step [<n>]
<n> is optional parameter to specify number of instructions to run, example:
> step 10`,
Func: handleStep,
},
{
Name: "stepinto",
Help: "Stepinto instruction to take in the debugger",
LongHelp: `Usage: stepInto
example:
> stepinto`,
Func: handleStepInto,
},
{
Name: "stepout",
Help: "Stepout instruction to take in the debugger",
LongHelp: `Usage: stepOut
example:
> stepout`,
Func: handleStepOut,
},
{
Name: "stepover",
Help: "Stepover instruction to take in the debugger",
LongHelp: `Usage: stepOver
example:
> stepover`,
Func: handleStepOver,
},
{
Name: "ops",
Help: "Dump opcodes of the current loaded program",
LongHelp: "Dump opcodes of the current loaded program",
Func: handleOps,
},
}
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// VMCLI object for interacting with the VM.
type VMCLI struct {
vm *vm.VM
shell *ishell.Shell
}
// New returns a new VMCLI object.
func New() *VMCLI {
vmcli := VMCLI{
vm: vm.New(),
shell: ishell.New(),
}
vmcli.shell.Set(vmKey, vmcli.vm)
for _, c := range commands {
vmcli.shell.AddCmd(c)
}
changePrompt(vmcli.shell, vmcli.vm)
return &vmcli
}
func getVMFromContext(c *ishell.Context) *vm.VM {
return c.Get(vmKey).(*vm.VM)
}
func checkVMIsReady(c *ishell.Context) bool {
v := getVMFromContext(c)
if v == nil || !v.Ready() {
c.Err(errors.New("VM is not ready: no program loaded"))
return false
}
return true
}
func handleExit(c *ishell.Context) {
c.Println("Bye!")
os.Exit(0)
}
func handleIP(c *ishell.Context) {
if !checkVMIsReady(c) {
return
}
v := getVMFromContext(c)
ip, opcode := v.Context().CurrInstr()
c.Printf("instruction pointer at %d (%s)\n", ip, opcode)
}
func handleBreak(c *ishell.Context) {
if !checkVMIsReady(c) {
return
}
v := getVMFromContext(c)
if len(c.Args) != 1 {
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c.Err(errors.New("missing parameter <ip>"))
}
n, err := strconv.Atoi(c.Args[0])
if err != nil {
c.Err(fmt.Errorf("argument conversion error: %s", err))
return
}
v.AddBreakPoint(n)
c.Printf("breakpoint added at instruction %d\n", n)
}
func handleXStack(c *ishell.Context) {
v := getVMFromContext(c)
c.Println(v.Stack(c.Cmd.Name))
}
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func handleLoadNEF(c *ishell.Context) {
v := getVMFromContext(c)
if len(c.Args) < 1 {
c.Err(errors.New("missing parameter <file>"))
return
}
if err := v.LoadFile(c.Args[0]); err != nil {
c.Err(err)
} else {
c.Printf("READY: loaded %d instructions\n", v.Context().LenInstr())
}
changePrompt(c, v)
}
func handleLoadBase64(c *ishell.Context) {
v := getVMFromContext(c)
if len(c.Args) < 1 {
c.Err(errors.New("missing parameter <string>"))
return
}
b, err := base64.StdEncoding.DecodeString(c.Args[0])
if err != nil {
c.Err(err)
return
}
v.Load(b)
c.Printf("READY: loaded %d instructions\n", v.Context().LenInstr())
changePrompt(c, v)
}
func handleLoadHex(c *ishell.Context) {
v := getVMFromContext(c)
if len(c.Args) < 1 {
c.Err(errors.New("missing parameter <string>"))
return
}
b, err := hex.DecodeString(c.Args[0])
if err != nil {
c.Err(err)
return
}
v.Load(b)
c.Printf("READY: loaded %d instructions\n", v.Context().LenInstr())
changePrompt(c, v)
}
func handleLoadGo(c *ishell.Context) {
v := getVMFromContext(c)
if len(c.Args) < 1 {
c.Err(errors.New("missing parameter <file>"))
return
}
fb, err := ioutil.ReadFile(c.Args[0])
if err != nil {
c.Err(err)
return
}
b, err := compiler.Compile(bytes.NewReader(fb))
if err != nil {
c.Err(err)
return
}
v.Load(b)
c.Printf("READY: loaded %d instructions\n", v.Context().LenInstr())
changePrompt(c, v)
}
func handleRun(c *ishell.Context) {
v := getVMFromContext(c)
if len(c.Args) != 0 {
var (
method []byte
params []stackitem.Item
err error
)
method = []byte(c.Args[0])
params, err = parseArgs(c.Args[1:])
if err != nil {
c.Err(err)
return
}
v.LoadArgs(method, params)
}
runVMWithHandling(c, v)
changePrompt(c, v)
}
// runVMWithHandling runs VM with handling errors and additional state messages.
func runVMWithHandling(c *ishell.Context, v *vm.VM) {
err := v.Run()
if err != nil {
c.Err(err)
return
}
var message string
switch {
case v.HasFailed():
message = "FAILED"
case v.HasHalted():
message = v.Stack("estack")
case v.AtBreakpoint():
ctx := v.Context()
i, op := ctx.CurrInstr()
message = fmt.Sprintf("at breakpoint %d (%s)\n", i, op.String())
}
if message != "" {
c.Printf(message)
}
}
func handleCont(c *ishell.Context) {
if !checkVMIsReady(c) {
return
}
v := getVMFromContext(c)
runVMWithHandling(c, v)
changePrompt(c, v)
}
func handleStep(c *ishell.Context) {
var (
n = 1
err error
)
if !checkVMIsReady(c) {
return
}
v := getVMFromContext(c)
if len(c.Args) > 0 {
n, err = strconv.Atoi(c.Args[0])
if err != nil {
c.Err(fmt.Errorf("argument conversion error: %s", err))
return
}
}
v.AddBreakPointRel(n)
runVMWithHandling(c, v)
changePrompt(c, v)
}
func handleStepInto(c *ishell.Context) {
handleStepType(c, "into")
}
func handleStepOut(c *ishell.Context) {
handleStepType(c, "out")
}
func handleStepOver(c *ishell.Context) {
handleStepType(c, "over")
}
func handleStepType(c *ishell.Context, stepType string) {
if !checkVMIsReady(c) {
return
}
v := getVMFromContext(c)
var err error
switch stepType {
case "into":
err = v.StepInto()
case "out":
err = v.StepOut()
case "over":
err = v.StepOver()
}
if err != nil {
c.Err(err)
}
handleIP(c)
changePrompt(c, v)
}
func handleOps(c *ishell.Context) {
if !checkVMIsReady(c) {
return
}
v := getVMFromContext(c)
v.PrintOps()
}
func changePrompt(c ishell.Actions, v *vm.VM) {
if v.Ready() && v.Context().IP()-1 >= 0 {
c.SetPrompt(fmt.Sprintf("NEO-GO-VM %d > ", v.Context().IP()-1))
} else {
c.SetPrompt("NEO-GO-VM > ")
}
}
// Run waits for user input from Stdin and executes the passed command.
func (c *VMCLI) Run() error {
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printLogo(c.shell)
c.shell.Run()
return nil
}
func handleParse(c *ishell.Context) {
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res, err := Parse(c.Args)
if err != nil {
c.Err(err)
return
}
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c.Print(res)
}
// Parse converts it's argument to other formats.
func Parse(args []string) (string, error) {
if len(args) < 1 {
return "", errors.New("missing argument")
}
arg := args[0]
buf := bytes.NewBuffer(nil)
if val, err := strconv.ParseInt(arg, 10, 64); err == nil {
bs := bigint.ToBytes(big.NewInt(val))
buf.WriteString(fmt.Sprintf("Integer to Hex\t%s\n", hex.EncodeToString(bs)))
buf.WriteString(fmt.Sprintf("Integer to Base64\t%s\n", base64.StdEncoding.EncodeToString(bs)))
}
noX := strings.TrimPrefix(arg, "0x")
if rawStr, err := hex.DecodeString(noX); err == nil {
if val, err := util.Uint160DecodeBytesBE(rawStr); err == nil {
buf.WriteString(fmt.Sprintf("BE ScriptHash to Address\t%s\n", address.Uint160ToString(val)))
buf.WriteString(fmt.Sprintf("LE ScriptHash to Address\t%s\n", address.Uint160ToString(val.Reverse())))
}
buf.WriteString(fmt.Sprintf("Hex to String\t%s\n", fmt.Sprintf("%q", string(rawStr))))
buf.WriteString(fmt.Sprintf("Hex to Integer\t%s\n", bigint.FromBytes(rawStr)))
buf.WriteString(fmt.Sprintf("Swap Endianness\t%s\n", hex.EncodeToString(util.ArrayReverse(rawStr))))
}
if addr, err := address.StringToUint160(arg); err == nil {
buf.WriteString(fmt.Sprintf("Address to BE ScriptHash\t%s\n", addr))
buf.WriteString(fmt.Sprintf("Address to LE ScriptHash\t%s\n", addr.Reverse()))
buf.WriteString(fmt.Sprintf("Address to Base64 (BE)\t%s\n", base64.StdEncoding.EncodeToString(addr.BytesBE())))
buf.WriteString(fmt.Sprintf("Address to Base64 (LE)\t%s\n", base64.StdEncoding.EncodeToString(addr.BytesLE())))
}
if rawStr, err := base64.StdEncoding.DecodeString(arg); err == nil {
buf.WriteString(fmt.Sprintf("Base64 to String\t%s\n", fmt.Sprintf("%q", string(rawStr))))
buf.WriteString(fmt.Sprintf("Base64 to BigInteger\t%s\n", bigint.FromBytes(rawStr)))
}
buf.WriteString(fmt.Sprintf("String to Hex\t%s\n", hex.EncodeToString([]byte(arg))))
buf.WriteString(fmt.Sprintf("String to Base64\t%s\n", base64.StdEncoding.EncodeToString([]byte(arg))))
out := buf.Bytes()
buf = bytes.NewBuffer(nil)
w := tabwriter.NewWriter(buf, 0, 4, 4, '\t', 0)
if _, err := w.Write(out); err != nil {
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return "", err
}
if err := w.Flush(); err != nil {
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return "", err
}
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return string(buf.Bytes()), nil
}
func parseArgs(args []string) ([]stackitem.Item, error) {
items := make([]stackitem.Item, len(args))
for i, arg := range args {
var typ, value string
typeAndVal := strings.Split(arg, ":")
if len(typeAndVal) < 2 {
if typeAndVal[0] == boolFalse || typeAndVal[0] == boolTrue {
typ = boolType
} else if _, err := strconv.Atoi(typeAndVal[0]); err == nil {
typ = intType
} else {
typ = stringType
}
value = typeAndVal[0]
} else {
typ = typeAndVal[0]
value = typeAndVal[1]
}
switch typ {
case boolType:
if value == boolFalse {
items[i] = stackitem.NewBool(false)
} else if value == boolTrue {
items[i] = stackitem.NewBool(true)
} else {
return nil, errors.New("failed to parse bool parameter")
}
case intType:
val, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return nil, err
}
items[i] = stackitem.NewBigInteger(big.NewInt(val))
case stringType:
items[i] = stackitem.NewByteArray([]byte(value))
}
}
return items, nil
}
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func printLogo(c *ishell.Shell) {
logo := `
_ ____________ __________ _ ____ ___
/ | / / ____/ __ \ / ____/ __ \ | | / / |/ /
/ |/ / __/ / / / /_____/ / __/ / / /____| | / / /|_/ /
/ /| / /___/ /_/ /_____/ /_/ / /_/ /_____/ |/ / / / /
/_/ |_/_____/\____/ \____/\____/ |___/_/ /_/
`
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c.Print(logo)
c.Println()
c.Println()
}