0g-chain/app/_simulate_tx.go

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package app
import (
"net/http"
"github.com/gorilla/mux"
"github.com/cosmos/cosmos-sdk/client/context"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/types/rest"
"github.com/cosmos/cosmos-sdk/x/auth"
)
// SimulateRequest represents attributes of a tx that will be simulated
type SimulateRequest struct {
Msgs []sdk.Msg `json:"msgs"`
Fee auth.StdFee `json:"fee"`
Memo string `json:"memo"`
}
// RegisterSimulateRoutes registers a tx simulate route to a mux router with
// a provided cli context
func RegisterSimulateRoutes(cliCtx context.CLIContext, r *mux.Router) {
r.HandleFunc("/tx/simulate", postAppSimulateHandlerFn(cliCtx)).Methods("POST")
}
// postAppSimulateHandlerFn handles tx simulate requests and returns the height and
// output of the simulation
func postAppSimulateHandlerFn(cliCtx context.CLIContext) http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
var req SimulateRequest
if !rest.ReadRESTReq(w, r, cliCtx.Codec, &req) {
return
}
tx := auth.NewStdTx(
req.Msgs,
req.Fee,
[]auth.StdSignature{{}},
req.Memo,
)
txBz, err := cliCtx.Codec.MarshalBinaryLengthPrefixed(tx)
if err != nil {
rest.WriteErrorResponse(w, http.StatusBadRequest, err.Error())
return
}
bz, height, err := cliCtx.QueryWithData("/app/simulate", txBz)
cliCtx = cliCtx.WithHeight(height)
if err != nil {
rest.WriteErrorResponse(w, http.StatusBadRequest, err.Error())
return
}
var simRes sdk.SimulationResponse
if err := cliCtx.Codec.UnmarshalBinaryBare(bz, &simRes); err != nil {
rest.WriteErrorResponse(w, http.StatusInternalServerError, err.Error())
return
}
rest.PostProcessResponse(w, cliCtx, simRes)
}
}