path: root/rpc/api.go

package rpc

import (
    "encoding/json"
    "math/big"
    "path"
    "sync"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/core"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/ethdb"
    "github.com/ethereum/go-ethereum/xeth"
)

type EthereumApi struct {
    eth    *xeth.XEth
    xethMu sync.RWMutex
    db     common.Database

    // Miner agent
    agent *Agent
}

func NewEthereumApi(eth *xeth.XEth, dataDir string) *EthereumApi {
    // What about when dataDir is empty?
    db, _ := ethdb.NewLDBDatabase(path.Join(dataDir, "dapps"))
    api := &EthereumApi{
        eth:   eth,
        db:    db,
        agent: NewAgent(),
    }
    eth.Backend().Miner().Register(api.agent)

    return api
}

func (self *EthereumApi) xeth() *xeth.XEth {
    self.xethMu.RLock()
    defer self.xethMu.RUnlock()

    return self.eth
}

func (self *EthereumApi) xethAtStateNum(num int64) *xeth.XEth {
    return self.xeth().AtStateNum(num)
}

func (p *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) error {
    // Spec at https://github.com/ethereum/wiki/wiki/Generic-JSON-RPC
    rpclogger.Debugf("%s %s", req.Method, req.Params)

    switch req.Method {
    case "web3_sha3":
        args := new(Sha3Args)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }
        *reply = common.ToHex(crypto.Sha3(common.FromHex(args.Data)))
    case "web3_clientVersion":
        *reply = p.xeth().Backend().Version()
    case "net_version":
        return NewNotImplementedError(req.Method)
    case "net_listening":
        *reply = p.xeth().IsListening()
    case "net_peerCount":
        v := p.xeth().PeerCount()
        *reply = common.ToHex(big.NewInt(int64(v)).Bytes())
    case "eth_coinbase":
        // TODO handling of empty coinbase due to lack of accounts
        res := p.xeth().Coinbase()
        if res == "0x" || res == "0x0" {
            *reply = nil
        } else {
            *reply = res
        }
    case "eth_mining":
        *reply = p.xeth().IsMining()
    case "eth_gasPrice":
        v := p.xeth().DefaultGas()
        *reply = common.ToHex(v.Bytes())
    case "eth_accounts":
        *reply = p.xeth().Accounts()
    case "eth_blockNumber":
        v := p.xeth().Backend().ChainManager().CurrentBlock().Number()
        *reply = common.ToHex(v.Bytes())
    case "eth_getBalance":
        args := new(GetBalanceArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        if err := args.requirements(); err != nil {
            return err
        }

        v := p.xethAtStateNum(args.BlockNumber).State().SafeGet(args.Address).Balance()
        *reply = common.ToHex(v.Bytes())
    case "eth_getStorage", "eth_storageAt":
        args := new(GetStorageArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        if err := args.requirements(); err != nil {
            return err
        }

        *reply = p.xethAtStateNum(args.BlockNumber).State().SafeGet(args.Address).Storage()
    case "eth_getStorageAt":
        args := new(GetStorageAtArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }
        if err := args.requirements(); err != nil {
            return err
        }

        state := p.xethAtStateNum(args.BlockNumber).State().SafeGet(args.Address)
        value := state.StorageString(args.Key)

        *reply = common.Bytes2Hex(value.Bytes())
    case "eth_getTransactionCount":
        args := new(GetTxCountArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        err := args.requirements()
        if err != nil {
            return err
        }

        *reply = p.xethAtStateNum(args.BlockNumber).TxCountAt(args.Address)
    case "eth_getBlockTransactionCountByHash":
        args := new(GetBlockByHashArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        block := NewBlockRes(p.xeth().EthBlockByHash(args.BlockHash))
        *reply = common.ToHex(big.NewInt(int64(len(block.Transactions))).Bytes())
    case "eth_getBlockTransactionCountByNumber":
        args := new(GetBlockByNumberArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        block := NewBlockRes(p.xeth().EthBlockByNumber(args.BlockNumber))
        *reply = common.ToHex(big.NewInt(int64(len(block.Transactions))).Bytes())
    case "eth_getUncleCountByBlockHash":
        args := new(GetBlockByHashArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        block := p.xeth().EthBlockByHash(args.BlockHash)
        br := NewBlockRes(block)
        *reply = common.ToHex(big.NewInt(int64(len(br.Uncles))).Bytes())
    case "eth_getUncleCountByBlockNumber":
        args := new(GetBlockByNumberArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        block := p.xeth().EthBlockByNumber(args.BlockNumber)
        br := NewBlockRes(block)
        *reply = common.ToHex(big.NewInt(int64(len(br.Uncles))).Bytes())
    case "eth_getData", "eth_getCode":
        args := new(GetDataArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }
        if err := args.requirements(); err != nil {
            return err
        }
        *reply = p.xethAtStateNum(args.BlockNumber).CodeAt(args.Address)
    case "eth_sendTransaction", "eth_transact":
        args := new(NewTxArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        if err := args.requirements(); err != nil {
            return err
        }

        v, err := p.xeth().Transact(args.From, args.To, args.Value.String(), args.Gas.String(), args.GasPrice.String(), args.Data)
        if err != nil {
            return err
        }
        *reply = v
    case "eth_call":
        args := new(NewTxArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        v, err := p.xethAtStateNum(args.BlockNumber).Call(args.From, args.To, args.Value.String(), args.Gas.String(), args.GasPrice.String(), args.Data)
        if err != nil {
            return err
        }

        *reply = v
    case "eth_flush":
        return NewNotImplementedError(req.Method)
    case "eth_getBlockByHash":
        args := new(GetBlockByHashArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        block := p.xeth().EthBlockByHash(args.BlockHash)
        br := NewBlockRes(block)
        br.fullTx = args.IncludeTxs

        *reply = br
    case "eth_getBlockByNumber":
        args := new(GetBlockByNumberArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        block := p.xeth().EthBlockByNumber(args.BlockNumber)
        br := NewBlockRes(block)
        br.fullTx = args.IncludeTxs

        *reply = br
    case "eth_getTransactionByHash":
        // HashIndexArgs used, but only the "Hash" part we need.
        args := new(HashIndexArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
        }
        tx := p.xeth().EthTransactionByHash(args.Hash)
        if tx != nil {
            *reply = NewTransactionRes(tx)
        }
    case "eth_getTransactionByBlockHashAndIndex":
        args := new(HashIndexArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        block := p.xeth().EthBlockByHash(args.Hash)
        br := NewBlockRes(block)
        br.fullTx = true

        if args.Index > int64(len(br.Transactions)) || args.Index < 0 {
            return NewValidationError("Index", "does not exist")
        }
        *reply = br.Transactions[args.Index]
    case "eth_getTransactionByBlockNumberAndIndex":
        args := new(BlockNumIndexArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        block := p.xeth().EthBlockByNumber(args.BlockNumber)
        v := NewBlockRes(block)
        v.fullTx = true

        if args.Index > int64(len(v.Transactions)) || args.Index < 0 {
            return NewValidationError("Index", "does not exist")
        }
        *reply = v.Transactions[args.Index]
    case "eth_getUncleByBlockHashAndIndex":
        args := new(HashIndexArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        br := NewBlockRes(p.xeth().EthBlockByHash(args.Hash))

        if args.Index > int64(len(br.Uncles)) || args.Index < 0 {
            return NewValidationError("Index", "does not exist")
        }

        uhash := br.Uncles[args.Index].Hex()
        uncle := NewBlockRes(p.xeth().EthBlockByHash(uhash))

        *reply = uncle
    case "eth_getUncleByBlockNumberAndIndex":
        args := new(BlockNumIndexArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        block := p.xeth().EthBlockByNumber(args.BlockNumber)
        v := NewBlockRes(block)
        v.fullTx = true

        if args.Index > int64(len(v.Uncles)) || args.Index < 0 {
            return NewValidationError("Index", "does not exist")
        }

        uhash := v.Uncles[args.Index].Hex()
        uncle := NewBlockRes(p.xeth().EthBlockByHash(uhash))

        *reply = uncle
    case "eth_getCompilers":
        c := []string{""}
        *reply = c
    case "eth_compileSolidity", "eth_compileLLL", "eth_compileSerpent":
        return NewNotImplementedError(req.Method)
    case "eth_newFilter":
        args := new(BlockFilterArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        opts := toFilterOptions(args)
        id := p.xeth().RegisterFilter(opts)
        *reply = common.ToHex(big.NewInt(int64(id)).Bytes())
    case "eth_newBlockFilter":
        args := new(FilterStringArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }
        if err := args.requirements(); err != nil {
            return err
        }

        id := p.xeth().NewFilterString(args.Word)
        *reply = common.ToHex(big.NewInt(int64(id)).Bytes())
    case "eth_uninstallFilter":
        args := new(FilterIdArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }
        *reply = p.xeth().UninstallFilter(args.Id)
    case "eth_getFilterChanges":
        args := new(FilterIdArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }
        *reply = NewLogsRes(p.xeth().FilterChanged(args.Id))
    case "eth_getFilterLogs":
        args := new(FilterIdArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }
        *reply = NewLogsRes(p.xeth().Logs(args.Id))
    case "eth_getLogs":
        args := new(BlockFilterArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }
        opts := toFilterOptions(args)
        *reply = NewLogsRes(p.xeth().AllLogs(opts))
    case "eth_getWork":
        *reply = p.getWork()
    case "eth_submitWork":
        // TODO what is the reply here?
        // TODO what are the arguments?
        p.agent.SetResult(0, common.Hash{}, common.Hash{})

        return NewNotImplementedError(req.Method)
    case "db_putString":
        args := new(DbArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        if err := args.requirements(); err != nil {
            return err
        }

        p.db.Put([]byte(args.Database+args.Key), []byte(args.Value))
        *reply = true
    case "db_getString":
        args := new(DbArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        if err := args.requirements(); err != nil {
            return err
        }

        res, _ := p.db.Get([]byte(args.Database + args.Key))
        *reply = string(res)
    case "db_putHex", "db_getHex":
        return NewNotImplementedError(req.Method)
    case "shh_post":
        args := new(WhisperMessageArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }

        err := p.xeth().Whisper().Post(args.Payload, args.To, args.From, args.Topics, args.Priority, args.Ttl)
        if err != nil {
            return err
        }

        *reply = true
    case "shh_newIdentity":
        *reply = p.xeth().Whisper().NewIdentity()
    // case "shh_removeIdentity":
    //  args := new(WhisperIdentityArgs)
    //  if err := json.Unmarshal(req.Params, &args); err != nil {
    //      return err
    //  }
    //  *reply = p.xeth().Whisper().RemoveIdentity(args.Identity)
    case "shh_hasIdentity":
        args := new(WhisperIdentityArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }
        *reply = p.xeth().Whisper().HasIdentity(args.Identity)
    case "shh_newGroup", "shh_addToGroup":
        return NewNotImplementedError(req.Method)
    case "shh_newFilter":
        args := new(WhisperFilterArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }
        opts := new(xeth.Options)
        opts.From = args.From
        opts.To = args.To
        opts.Topics = args.Topics
        id := p.xeth().NewWhisperFilter(opts)
        *reply = common.ToHex(big.NewInt(int64(id)).Bytes())
    case "shh_uninstallFilter":
        args := new(FilterIdArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }
        *reply = p.xeth().UninstallWhisperFilter(args.Id)
    case "shh_getFilterChanges":
        args := new(FilterIdArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }
        *reply = p.xeth().MessagesChanged(args.Id)
    case "shh_getMessages":
        args := new(FilterIdArgs)
        if err := json.Unmarshal(req.Params, &args); err != nil {
            return err
        }
        *reply = p.xeth().Whisper().Messages(args.Id)

    // case "eth_register":
    //  // Placeholder for actual type
    //  args := new(HashIndexArgs)
    //  if err := json.Unmarshal(req.Params, &args); err != nil {
    //      return err
    //  }
    //  *reply = p.xeth().Register(args.Hash)
    // case "eth_unregister":
    //  args := new(HashIndexArgs)
    //  if err := json.Unmarshal(req.Params, &args); err != nil {
    //      return err
    //  }
    //  *reply = p.xeth().Unregister(args.Hash)
    // case "eth_watchTx":
    //  args := new(HashIndexArgs)
    //  if err := json.Unmarshal(req.Params, &args); err != nil {
    //      return err
    //  }
    //  *reply = p.xeth().PullWatchTx(args.Hash)
    default:
        return NewNotImplementedError(req.Method)
    }

    rpclogger.DebugDetailf("Reply: %T %s", reply, reply)
    return nil
}

func (p *EthereumApi) getWork() string {
    p.xeth().SetMining(true)
    return p.agent.GetWork().Hex()
}

func toFilterOptions(options *BlockFilterArgs) *core.FilterOptions {
    var opts core.FilterOptions

    // Convert optional address slice/string to byte slice
    if str, ok := options.Address.(string); ok {
        opts.Address = []common.Address{common.HexToAddress(str)}
    } else if slice, ok := options.Address.([]interface{}); ok {
        bslice := make([]common.Address, len(slice))
        for i, addr := range slice {
            if saddr, ok := addr.(string); ok {
                bslice[i] = common.HexToAddress(saddr)
            }
        }
        opts.Address = bslice
    }

    opts.Earliest = options.Earliest
    opts.Latest = options.Latest

    topics := make([][]common.Hash, len(options.Topics))
    for i, topicDat := range options.Topics {
        if slice, ok := topicDat.([]interface{}); ok {
            topics[i] = make([]common.Hash, len(slice))
            for j, topic := range slice {
                topics[i][j] = common.HexToHash(topic.(string))
            }
        } else if str, ok := topicDat.(string); ok {
            topics[i] = []common.Hash{common.HexToHash(str)}
        }
    }
    opts.Topics = topics

    return &opts
}

/*
    Work() chan<- *types.Block
    SetWorkCh(chan<- Work)
    Stop()
    Start()
    Rate() uint64
*/