path: root/rpc/api/debug.go

package api

import (
    "fmt"

    "github.com/ethereum/ethash"
    "github.com/ethereum/go-ethereum/core/state"
    "github.com/ethereum/go-ethereum/core/vm"
    "github.com/ethereum/go-ethereum/eth"
    "github.com/ethereum/go-ethereum/rlp"
    "github.com/ethereum/go-ethereum/rpc/codec"
    "github.com/ethereum/go-ethereum/rpc/shared"
    "github.com/ethereum/go-ethereum/xeth"
)

const (
    DebugVersion = "1.0.0"
)

var (
    // mapping between methods and handlers
    DebugMapping = map[string]debughandler{
        "debug_dumpBlock":    (*DebugApi).DumpBlock,
        "debug_getBlockRlp":  (*DebugApi).GetBlockRlp,
        "debug_printBlock":   (*DebugApi).PrintBlock,
        "debug_processBlock": (*DebugApi).ProcessBlock,
        "debug_seedHash":     (*DebugApi).SeedHash,
        "debug_setHead":      (*DebugApi).SetHead,
    }
)

// debug callback handler
type debughandler func(*DebugApi, *shared.Request) (interface{}, error)

// admin api provider
type DebugApi struct {
    xeth     *xeth.XEth
    ethereum *eth.Ethereum
    methods  map[string]debughandler
    codec    codec.ApiCoder
}

// create a new debug api instance
func NewDebugApi(xeth *xeth.XEth, ethereum *eth.Ethereum, coder codec.Codec) *DebugApi {
    return &DebugApi{
        xeth:     xeth,
        ethereum: ethereum,
        methods:  DebugMapping,
        codec:    coder.New(nil),
    }
}

// collection with supported methods
func (self *DebugApi) Methods() []string {
    methods := make([]string, len(self.methods))
    i := 0
    for k := range self.methods {
        methods[i] = k
        i++
    }
    return methods
}

// Execute given request
func (self *DebugApi) Execute(req *shared.Request) (interface{}, error) {
    if callback, ok := self.methods[req.Method]; ok {
        return callback(self, req)
    }

    return nil, &shared.NotImplementedError{req.Method}
}

func (self *DebugApi) Name() string {
    return DebugApiName
}

func (self *DebugApi) PrintBlock(req *shared.Request) (interface{}, error) {
    args := new(BlockNumArg)
    if err := self.codec.Decode(req.Params, &args); err != nil {
        return nil, shared.NewDecodeParamError(err.Error())
    }

    block := self.xeth.EthBlockByNumber(args.BlockNumber)
    return fmt.Sprintf("%s", block), nil
}

func (self *DebugApi) DumpBlock(req *shared.Request) (interface{}, error) {
    args := new(BlockNumArg)
    if err := self.codec.Decode(req.Params, &args); err != nil {
        return nil, shared.NewDecodeParamError(err.Error())
    }

    block := self.xeth.EthBlockByNumber(args.BlockNumber)
    if block == nil {
        return nil, fmt.Errorf("block #%d not found", args.BlockNumber)
    }

    stateDb := state.New(block.Root(), self.ethereum.StateDb())
    if stateDb == nil {
        return nil, nil
    }

    return stateDb.Dump(), nil
}

func (self *DebugApi) GetBlockRlp(req *shared.Request) (interface{}, error) {
    args := new(BlockNumArg)
    if err := self.codec.Decode(req.Params, &args); err != nil {
        return nil, shared.NewDecodeParamError(err.Error())
    }

    block := self.xeth.EthBlockByNumber(args.BlockNumber)
    if block == nil {
        return nil, fmt.Errorf("block #%d not found", args.BlockNumber)
    }
    encoded, err := rlp.EncodeToBytes(block)
    return fmt.Sprintf("%x", encoded), err
}

func (self *DebugApi) SetHead(req *shared.Request) (interface{}, error) {
    args := new(BlockNumArg)
    if err := self.codec.Decode(req.Params, &args); err != nil {
        return nil, shared.NewDecodeParamError(err.Error())
    }

    block := self.xeth.EthBlockByNumber(args.BlockNumber)
    if block == nil {
        return nil, fmt.Errorf("block #%d not found", args.BlockNumber)
    }

    self.ethereum.ChainManager().SetHead(block)

    return nil, nil
}

func (self *DebugApi) ProcessBlock(req *shared.Request) (interface{}, error) {
    args := new(BlockNumArg)
    if err := self.codec.Decode(req.Params, &args); err != nil {
        return nil, shared.NewDecodeParamError(err.Error())
    }

    block := self.xeth.EthBlockByNumber(args.BlockNumber)
    if block == nil {
        return nil, fmt.Errorf("block #%d not found", args.BlockNumber)
    }

    old := vm.Debug
    defer func() { vm.Debug = old }()
    vm.Debug = true

    _, err := self.ethereum.BlockProcessor().RetryProcess(block)
    if err == nil {
        return true, nil
    }
    return false, err
}

func (self *DebugApi) SeedHash(req *shared.Request) (interface{}, error) {
    args := new(BlockNumArg)
    if err := self.codec.Decode(req.Params, &args); err != nil {
        return nil, shared.NewDecodeParamError(err.Error())
    }

    if hash, err := ethash.GetSeedHash(uint64(args.BlockNumber)); err == nil {
        return fmt.Sprintf("0x%x", hash), nil
    } else {
        return nil, err
    }
}