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path: root/ethereum/repl.go
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package main

import (
    "bufio"
    "fmt"
    "github.com/ethereum/eth-go"
    "github.com/ethereum/eth-go/ethpub"
    "github.com/ethereum/eth-go/ethutil"
    "github.com/obscuren/otto"
    "io"
    "os"
    "path"
)

type Repl interface {
    Start()
    Stop()
}

type JSRepl struct {
    re *JSRE

    prompt string

    history *os.File
}

func NewJSRepl(ethereum *eth.Ethereum) *JSRepl {
    hist, err := os.OpenFile(path.Join(ethutil.Config.ExecPath, "history"), os.O_RDWR|os.O_CREATE, os.ModePerm)
    if err != nil {
        panic(err)
    }

    return &JSRepl{re: NewJSRE(ethereum), prompt: "> ", history: hist}
}

func (self *JSRepl) Start() {
    reader := bufio.NewReader(self.history)
    for {
        line, err := reader.ReadString('\n')
        if err != nil && err == io.EOF {
            break
        } else if err != nil {
            fmt.Println("error reading history", err)
            break
        }

        addHistory(line[:len(line)-1])
    }
    self.read()
}

func (self *JSRepl) Stop() {
    self.re.Stop()
    self.history.Close()
}

func (self *JSRepl) parseInput(code string) {
    defer func() {
        if r := recover(); r != nil {
            fmt.Println("[native] error", r)
        }
    }()

    value, err := self.re.Run(code)
    if err != nil {
        fmt.Println(err)
        return
    }

    self.PrintValue(value)
}

// The JSEthereum object attempts to wrap the PEthereum object and returns
// meaningful javascript objects
type JSBlock struct {
    *ethpub.PBlock
    eth *JSEthereum
}

func (self *JSBlock) GetTransaction(hash string) otto.Value {
    return self.eth.toVal(self.PBlock.GetTransaction(hash))
}

type JSEthereum struct {
    *ethpub.PEthereum
    vm *otto.Otto
}

func (self *JSEthereum) GetBlock(hash string) otto.Value {
    return self.toVal(&JSBlock{self.PEthereum.GetBlock(hash), self})
}

func (self *JSEthereum) GetPeers() otto.Value {
    return self.toVal(self.PEthereum.GetPeers())
}

func (self *JSEthereum) GetKey() otto.Value {
    return self.toVal(self.PEthereum.GetKey())
}

func (self *JSEthereum) GetStateObject(addr string) otto.Value {
    return self.toVal(self.PEthereum.GetStateObject(addr))
}

func (self *JSEthereum) GetStateKeyVals(addr string) otto.Value {
    return self.toVal(self.PEthereum.GetStateObject(addr).StateKeyVal(false))
}

func (self *JSEthereum) Transact(key, recipient, valueStr, gasStr, gasPriceStr, dataStr string) otto.Value {
    r, err := self.PEthereum.Transact(key, recipient, valueStr, gasStr, gasPriceStr, dataStr)
    if err != nil {
        fmt.Println(err)

        return otto.UndefinedValue()
    }

    return self.toVal(r)
}

func (self *JSEthereum) Create(key, valueStr, gasStr, gasPriceStr, scriptStr string) otto.Value {
    r, err := self.PEthereum.Create(key, valueStr, gasStr, gasPriceStr, scriptStr)

    if err != nil {
        fmt.Println(err)

        return otto.UndefinedValue()
    }

    return self.toVal(r)
}

func (self *JSEthereum) toVal(v interface{}) otto.Value {
    result, err := self.vm.ToValue(v)

    if err != nil {
        fmt.Println("Value unknown:", err)

        return otto.UndefinedValue()
    }

    return result
}