package rest import ( "context" "encoding/hex" "encoding/json" "net/http" "strings" "github.com/gorilla/mux" "github.com/cosmos/cosmos-sdk/client" clientrest "github.com/cosmos/cosmos-sdk/client/rest" "github.com/cosmos/cosmos-sdk/types/rest" authrest "github.com/cosmos/cosmos-sdk/x/auth/client/rest" rpctypes "github.com/tharsis/ethermint/rpc/ethereum/types" "github.com/ethereum/go-ethereum/common" ) // RegisterTxRoutes - Central function to define routes that get registered by the main application func RegisterTxRoutes(clientCtx client.Context, rtr *mux.Router) { r := clientrest.WithHTTPDeprecationHeaders(rtr) r.HandleFunc("/txs/{hash}", QueryTxRequestHandlerFn(clientCtx)).Methods("GET") r.HandleFunc("/txs", authrest.QueryTxsRequestHandlerFn(clientCtx)).Methods("GET") r.HandleFunc("/txs/decode", authrest.DecodeTxRequestHandlerFn(clientCtx)).Methods("POST") } // QueryTxRequestHandlerFn implements a REST handler that queries a transaction // by hash in a committed block. func QueryTxRequestHandlerFn(clientCtx client.Context) http.HandlerFunc { return func(w http.ResponseWriter, r *http.Request) { vars := mux.Vars(r) hashHexStr := vars["hash"] clientCtx, ok := rest.ParseQueryHeightOrReturnBadRequest(w, clientCtx, r) if !ok { return } ethHashPrefix := "0x" if !strings.HasPrefix(hashHexStr, ethHashPrefix) { authrest.QueryTxRequestHandlerFn(clientCtx) return } // eth Tx ethHashPrefixLength := len(ethHashPrefix) output, err := getEthTransactionByHash(clientCtx, hashHexStr[ethHashPrefixLength:]) if err != nil { rest.WriteErrorResponse(w, http.StatusInternalServerError, err.Error()) return } rest.PostProcessResponseBare(w, clientCtx, output) } } // GetTransactionByHash returns the transaction identified by hash. func getEthTransactionByHash(clientCtx client.Context, hashHex string) ([]byte, error) { hash, err := hex.DecodeString(hashHex) if err != nil { return nil, err } node, err := clientCtx.GetNode() if err != nil { return nil, err } tx, err := node.Tx(context.Background(), hash, false) if err != nil { return nil, err } // Can either cache or just leave this out if not necessary block, err := node.Block(context.Background(), &tx.Height) if err != nil { return nil, err } blockHash := common.BytesToHash(block.Block.Header.Hash()) ethTx, err := rpctypes.RawTxToEthTx(clientCtx, tx.Tx) if err != nil { return nil, err } height := uint64(tx.Height) rpcTx := rpctypes.NewTransaction(ethTx.AsTransaction(), blockHash, height, uint64(tx.Index)) return json.Marshal(rpcTx) }