256 lines
7.0 KiB
Go
256 lines
7.0 KiB
Go
package rest
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import (
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"fmt"
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"net/http"
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"strconv"
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"github.com/cosmos/cosmos-sdk/client"
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"github.com/cosmos/cosmos-sdk/client/context"
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"github.com/cosmos/cosmos-sdk/client/utils"
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"github.com/cosmos/cosmos-sdk/codec"
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"github.com/cosmos/cosmos-sdk/crypto/keys/keyerror"
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sdk "github.com/cosmos/cosmos-sdk/types"
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"github.com/cosmos/cosmos-sdk/x/auth"
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authtxb "github.com/cosmos/cosmos-sdk/x/auth/client/txbuilder"
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)
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//-----------------------------------------------------------------------------
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// Basic HTTP utilities
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// ErrorResponse defines the attributes of a JSON error response.
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type ErrorResponse struct {
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Code int `json:"code,omitempty"`
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Message string `json:"message"`
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}
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// NewErrorResponse creates a new ErrorResponse instance.
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func NewErrorResponse(code int, msg string) ErrorResponse {
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return ErrorResponse{Code: code, Message: msg}
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}
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// WriteErrorResponse prepares and writes a HTTP error
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// given a status code and an error message.
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func WriteErrorResponse(w http.ResponseWriter, status int, err string) {
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(status)
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w.Write(codec.Cdc.MustMarshalJSON(NewErrorResponse(0, err)))
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}
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// WriteSimulationResponse prepares and writes an HTTP
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// response for transactions simulations.
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func WriteSimulationResponse(w http.ResponseWriter, cdc *codec.Codec, gas uint64) {
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gasEst := GasEstimateResponse{GasEstimate: gas}
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resp, err := cdc.MarshalJSON(gasEst)
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if err != nil {
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WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
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return
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}
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w.Header().Set("Content-Type", "application/json")
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w.WriteHeader(http.StatusOK)
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w.Write(resp)
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}
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// ParseInt64OrReturnBadRequest converts s to a int64 value.
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func ParseInt64OrReturnBadRequest(w http.ResponseWriter, s string) (n int64, ok bool) {
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var err error
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n, err = strconv.ParseInt(s, 10, 64)
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if err != nil {
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err := fmt.Errorf("'%s' is not a valid int64", s)
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WriteErrorResponse(w, http.StatusBadRequest, err.Error())
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return n, false
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}
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return n, true
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}
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// ParseUint64OrReturnBadRequest converts s to a uint64 value.
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func ParseUint64OrReturnBadRequest(w http.ResponseWriter, s string) (n uint64, ok bool) {
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var err error
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n, err = strconv.ParseUint(s, 10, 64)
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if err != nil {
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err := fmt.Errorf("'%s' is not a valid uint64", s)
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WriteErrorResponse(w, http.StatusBadRequest, err.Error())
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return n, false
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}
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return n, true
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}
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// ParseFloat64OrReturnBadRequest converts s to a float64 value. It returns a
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// default value, defaultIfEmpty, if the string is empty.
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func ParseFloat64OrReturnBadRequest(w http.ResponseWriter, s string, defaultIfEmpty float64) (n float64, ok bool) {
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if len(s) == 0 {
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return defaultIfEmpty, true
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}
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n, err := strconv.ParseFloat(s, 64)
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if err != nil {
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WriteErrorResponse(w, http.StatusBadRequest, err.Error())
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return n, false
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}
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return n, true
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}
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//-----------------------------------------------------------------------------
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// Building / Sending utilities
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// CompleteAndBroadcastTxREST implements a utility function that facilitates
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// sending a series of messages in a signed tx. In addition, it will handle
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// tx gas simulation and estimation.
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//
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// NOTE: Also see CompleteAndBroadcastTxCLI.
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func CompleteAndBroadcastTxREST(
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w http.ResponseWriter, r *http.Request, cliCtx context.CLIContext,
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baseReq BaseReq, msgs []sdk.Msg, cdc *codec.Codec,
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) {
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gasAdj, ok := ParseFloat64OrReturnBadRequest(w, baseReq.GasAdjustment, client.DefaultGasAdjustment)
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if !ok {
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return
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}
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simAndExec, gas, err := client.ParseGas(baseReq.Gas)
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if err != nil {
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WriteErrorResponse(w, http.StatusBadRequest, err.Error())
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return
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}
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// derive the from account address and name from the Keybase
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fromAddress, fromName, err := context.GetFromFields(baseReq.From)
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if err != nil {
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WriteErrorResponse(w, http.StatusBadRequest, err.Error())
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return
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}
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cliCtx = cliCtx.WithFromName(fromName).WithFromAddress(fromAddress)
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txBldr := authtxb.NewTxBuilder(
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utils.GetTxEncoder(cdc), baseReq.AccountNumber,
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baseReq.Sequence, gas, gasAdj, baseReq.Simulate,
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baseReq.ChainID, baseReq.Memo, baseReq.Fees, baseReq.GasPrices,
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)
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txBldr, err = utils.PrepareTxBuilder(txBldr, cliCtx)
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if err != nil {
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WriteErrorResponse(w, http.StatusBadRequest, err.Error())
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return
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}
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if baseReq.Simulate || simAndExec {
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if gasAdj < 0 {
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WriteErrorResponse(w, http.StatusBadRequest, client.ErrInvalidGasAdjustment.Error())
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return
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}
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txBldr, err = utils.EnrichWithGas(txBldr, cliCtx, msgs)
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if err != nil {
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WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
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return
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}
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if baseReq.Simulate {
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WriteSimulationResponse(w, cdc, txBldr.GetGas())
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return
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}
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}
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txBytes, err := txBldr.BuildAndSign(cliCtx.GetFromName(), baseReq.Password, msgs)
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if keyerror.IsErrKeyNotFound(err) {
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WriteErrorResponse(w, http.StatusBadRequest, err.Error())
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return
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} else if keyerror.IsErrWrongPassword(err) {
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WriteErrorResponse(w, http.StatusUnauthorized, err.Error())
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return
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} else if err != nil {
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WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
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return
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}
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res, err := cliCtx.BroadcastTx(txBytes)
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if err != nil {
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WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
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return
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}
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PostProcessResponse(w, cdc, res, cliCtx.Indent)
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}
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// PostProcessResponse performs post processing for a REST response.
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func PostProcessResponse(w http.ResponseWriter, cdc *codec.Codec, response interface{}, indent bool) {
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var output []byte
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switch response.(type) {
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default:
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var err error
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if indent {
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output, err = cdc.MarshalJSONIndent(response, "", " ")
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} else {
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output, err = cdc.MarshalJSON(response)
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}
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if err != nil {
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WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
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return
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}
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case []byte:
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output = response.([]byte)
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}
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w.Header().Set("Content-Type", "application/json")
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w.Write(output)
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}
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// WriteGenerateStdTxResponse writes response for the generate only mode.
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func WriteGenerateStdTxResponse(
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w http.ResponseWriter, cdc *codec.Codec, cliCtx context.CLIContext, br BaseReq, msgs []sdk.Msg,
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) {
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gasAdj, ok := ParseFloat64OrReturnBadRequest(w, br.GasAdjustment, client.DefaultGasAdjustment)
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if !ok {
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return
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}
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simAndExec, gas, err := client.ParseGas(br.Gas)
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if err != nil {
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WriteErrorResponse(w, http.StatusBadRequest, err.Error())
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return
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}
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txBldr := authtxb.NewTxBuilder(
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utils.GetTxEncoder(cdc), br.AccountNumber, br.Sequence, gas, gasAdj,
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br.Simulate, br.ChainID, br.Memo, br.Fees, br.GasPrices,
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)
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if simAndExec {
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if gasAdj < 0 {
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WriteErrorResponse(w, http.StatusBadRequest, client.ErrInvalidGasAdjustment.Error())
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return
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}
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txBldr, err = utils.EnrichWithGas(txBldr, cliCtx, msgs)
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if err != nil {
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WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
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return
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}
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}
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stdMsg, err := txBldr.Build(msgs)
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if err != nil {
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WriteErrorResponse(w, http.StatusBadRequest, err.Error())
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return
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}
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output, err := cdc.MarshalJSON(auth.NewStdTx(stdMsg.Msgs, stdMsg.Fee, nil, stdMsg.Memo))
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if err != nil {
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WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
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return
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}
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w.Header().Set("Content-Type", "application/json")
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w.Write(output)
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return
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}
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