0g-chain/x/pricefeed/simulation/operations.go

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package simulation
import (
"fmt"
"math/rand"
"time"
"github.com/cosmos/cosmos-sdk/baseapp"
"github.com/cosmos/cosmos-sdk/codec"
"github.com/cosmos/cosmos-sdk/simapp/helpers"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/x/auth"
"github.com/cosmos/cosmos-sdk/x/simulation"
appparams "github.com/kava-labs/kava/app/params"
"github.com/kava-labs/kava/x/pricefeed/keeper"
"github.com/kava-labs/kava/x/pricefeed/types"
)
// Simulation operation weights constants
const (
OpWeightMsgUpdatePrices = "op_weight_msg_update_prices"
// Block time params are un-exported constants in cosmos-sdk/x/simulation.
// Copy them here in lieu of importing them.
minTimePerBlock time.Duration = (10000 / 2) * time.Second
maxTimePerBlock time.Duration = 10000 * time.Second
// Calculate the average block time
AverageBlockTime time.Duration = (maxTimePerBlock - minTimePerBlock) / 2
)
// WeightedOperations returns all the operations from the module with their respective weights
func WeightedOperations(
appParams simulation.AppParams, cdc *codec.Codec, ak auth.AccountKeeper, k keeper.Keeper,
) simulation.WeightedOperations {
var weightMsgUpdatePrices int
// var numBlocks int
appParams.GetOrGenerate(cdc, OpWeightMsgUpdatePrices, &weightMsgUpdatePrices, nil,
func(_ *rand.Rand) {
weightMsgUpdatePrices = appparams.DefaultWeightMsgUpdatePrices
},
)
return simulation.WeightedOperations{
simulation.NewWeightedOperation(
weightMsgUpdatePrices,
SimulateMsgUpdatePrices(ak, k, 10000),
),
}
}
// SimulateMsgUpdatePrices updates the prices of various assets by randomly varying them based on current price
func SimulateMsgUpdatePrices(ak auth.AccountKeeper, keeper keeper.Keeper, blocks int) simulation.Operation {
// runs one at the start of each simulation
startingPrices := map[string]sdk.Dec{
"btc:usd": sdk.MustNewDecFromStr("7000"),
"bnb:usd": sdk.MustNewDecFromStr("15"),
"xrp:usd": sdk.MustNewDecFromStr("0.25"),
}
// creates the new price generator from starting prices - resets for each sim
priceGenerator := NewPriceGenerator(startingPrices)
return func(
r *rand.Rand, app *baseapp.BaseApp, ctx sdk.Context, accs []simulation.Account, chainID string,
) (simulation.OperationMsg, []simulation.FutureOperation, error) {
// walk prices to current block height, noop if already called for current height
priceGenerator.Step(r, ctx.BlockHeight())
randomMarket := pickRandomAsset(ctx, keeper, r)
marketID := randomMarket.MarketID
address := getRandomOracle(r, randomMarket)
oracle, found := simulation.FindAccount(accs, address)
if !found {
return simulation.NoOpMsg(types.ModuleName), nil, nil
}
oracleAcc := ak.GetAccount(ctx, oracle.Address)
if oracleAcc == nil {
return simulation.NoOpMsg(types.ModuleName), nil, nil
}
// get price for marketID and current block height set in Step
price := priceGenerator.GetCurrentPrice(marketID)
// get the expiry time based off the current time
expiry := getExpiryTime(ctx)
// now create the msg to post price
msg := types.NewMsgPostPrice(oracle.Address, marketID, price, expiry)
spendable := oracleAcc.SpendableCoins(ctx.BlockTime())
fees, err := simulation.RandomFees(r, ctx, spendable)
if err != nil {
return simulation.NoOpMsg(types.ModuleName), nil, err
}
tx := helpers.GenTx(
[]sdk.Msg{msg},
fees,
helpers.DefaultGenTxGas,
chainID,
[]uint64{oracleAcc.GetAccountNumber()},
[]uint64{oracleAcc.GetSequence()},
oracle.PrivKey,
)
_, result, err := app.Deliver(tx)
if err != nil {
// to aid debugging, add the stack trace to the comment field of the returned opMsg
return simulation.NewOperationMsg(msg, false, fmt.Sprintf("%+v", err)), nil, err
}
return simulation.NewOperationMsg(msg, true, result.Log), nil, nil
}
}
// getRandomOracle picks a random oracle from the list of oracles
func getRandomOracle(r *rand.Rand, market types.Market) sdk.AccAddress {
randomIndex := simulation.RandIntBetween(r, 0, len(market.Oracles))
return market.Oracles[randomIndex]
}
// pickRandomAsset picks a random asset out of the assets with equal probability
// it returns the Market which includes the base asset as one of its fields
func pickRandomAsset(ctx sdk.Context, keeper keeper.Keeper, r *rand.Rand) (market types.Market) {
// get the params
params := keeper.GetParams(ctx)
// now pick a random asset
randomIndex := simulation.RandIntBetween(r, 0, len(params.Markets))
return params.Markets[randomIndex]
}
// getExpiryTime gets a price expiry time by taking the current time and adding a delta to it
func getExpiryTime(ctx sdk.Context) (t time.Time) {
// need to use the blocktime from the context as the context generates random start time when running simulations
return ctx.BlockTime().Add(AverageBlockTime * 5000) // if blocks were 6 seconds, the expiry would be 8 hrs
}