0g-chain/x/committee/simulation/operations.go
Kevin Davis b356309d90
Add optional rate limits to issuance (#627)
* add rate-limiting and optional blocklists

* fix: check account is not nil

* add tests for rate-limiting

* update simulations

* fix typos

* remove unsued function arg
2020-08-21 18:56:20 -04:00

203 lines
7.6 KiB
Go

package simulation
import (
"fmt"
"math/rand"
"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"
authexported "github.com/cosmos/cosmos-sdk/x/auth/exported"
"github.com/cosmos/cosmos-sdk/x/simulation"
"github.com/kava-labs/kava/x/committee/keeper"
"github.com/kava-labs/kava/x/committee/types"
)
var (
proposalPassPercentage = 0.9
)
type AccountKeeper interface {
GetAccount(sdk.Context, sdk.AccAddress) authexported.Account
}
// WeightedOperations creates an operation (with weight) for each type of proposal generator.
// Custom proposal generators can be added for more control over types of proposal submitted, eg to increase likelyhood of particular cdp param changes.
func WeightedOperations(appParams simulation.AppParams, cdc *codec.Codec, ak AccountKeeper,
k keeper.Keeper, wContents []simulation.WeightedProposalContent) simulation.WeightedOperations {
var wops simulation.WeightedOperations
for _, wContent := range wContents {
wContent := wContent // pin variable
if wContent.AppParamsKey == OpWeightSubmitCommitteeChangeProposal {
// don't include committee change/delete proposals as they're not enabled for submission to committees
continue
}
var weight int
// TODO this doesn't allow weights to be different from what they are in the gov module
appParams.GetOrGenerate(cdc, wContent.AppParamsKey, &weight, nil,
func(_ *rand.Rand) { weight = wContent.DefaultWeight })
wops = append(
wops,
simulation.NewWeightedOperation(
weight,
SimulateMsgSubmitProposal(cdc, ak, k, wContent.ContentSimulatorFn),
),
)
}
return wops
}
// SimulateMsgSubmitProposal creates a proposal using the passed contentSimulatorFn and tries to find a committee that has permissions for it. If it can't then it uses the fallback committee.
// If the fallback committee isn't there (eg when using an non-generated genesis) and no committee can be found this emits a no-op msg and doesn't do anything.
// For each submit proposal msg, future ops for the vote messages are generated. Sometimes it doesn't run enough votes to allow the proposal to timeout - the likelihood of this happening is controlled by a parameter.
func SimulateMsgSubmitProposal(cdc *codec.Codec, ak AccountKeeper, k keeper.Keeper, contentSim simulation.ContentSimulatorFn) simulation.Operation {
return func(r *rand.Rand, app *baseapp.BaseApp, ctx sdk.Context, accs []simulation.Account, chainID string) (simulation.OperationMsg, []simulation.FutureOperation, error) {
// 1) Send a submit proposal msg
committees := k.GetCommittees(ctx)
// shuffle committees to ensure proposals are distributed across them evenly
r.Shuffle(len(committees), func(i, j int) {
committees[i], committees[j] = committees[j], committees[i]
})
// move fallback committee to the end of slice
for i, c := range committees {
if c.ID == FallbackCommitteeID {
// switch places with last element
committees[i], committees[len(committees)-1] = committees[len(committees)-1], committees[i]
}
}
// pick a committee that has permissions for proposal
pp := types.PubProposal(contentSim(r, ctx, accs))
if pp == nil {
return simulation.NewOperationMsgBasic(types.ModuleName, "no-operation (conent generation function returned nil)", "", false, nil), nil, nil
}
var selectedCommittee types.Committee
var found bool
for _, c := range committees {
if c.HasPermissionsFor(ctx, cdc, k.ParamKeeper, pp) {
selectedCommittee = c
found = true
break
}
}
if !found {
// fallback committee was not present, this should only happen if not using the generated genesis state
return simulation.NewOperationMsgBasic(types.ModuleName, "no-operation (no committee has permissions for proposal)", "", false, nil), nil, nil
}
// create the msg and tx
proposer := selectedCommittee.Members[r.Intn(len(selectedCommittee.Members))] // won't panic as committees must have ≥ 1 members
msg := types.NewMsgSubmitProposal(
pp,
proposer,
selectedCommittee.ID,
)
account := ak.GetAccount(ctx, proposer)
fees, err := simulation.RandomFees(r, ctx, account.SpendableCoins(ctx.BlockTime()))
if err != nil {
return simulation.NoOpMsg(types.ModuleName), nil, err
}
proposerAcc, found := simulation.FindAccount(accs, proposer)
if !found {
return simulation.NoOpMsg(types.ModuleName), nil, fmt.Errorf("address not in account list")
}
tx := helpers.GenTx(
[]sdk.Msg{msg},
fees,
helpers.DefaultGenTxGas,
chainID,
[]uint64{account.GetAccountNumber()},
[]uint64{account.GetSequence()},
proposerAcc.PrivKey,
)
// submit tx
_, 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
}
// to aid debugging, add the result log to the comment field
submitOpMsg := simulation.NewOperationMsg(msg, true, result.Log)
// 2) Schedule vote operations
// get submitted proposal
proposalID := types.Uint64FromBytes(result.Data)
proposal, found := k.GetProposal(ctx, proposalID)
if !found {
return simulation.NoOpMsg(types.ModuleName), nil, fmt.Errorf("can't find proposal with ID '%d'", proposalID)
}
// pick the voters
// num voters determined by whether the proposal should pass or not
numMembers := int64(len(selectedCommittee.Members))
majority := selectedCommittee.VoteThreshold.Mul(sdk.NewInt(numMembers).ToDec()).Ceil().TruncateInt64()
numVoters := r.Int63n(majority) // in interval [0, majority)
shouldPass := r.Float64() < proposalPassPercentage
if shouldPass {
numVoters = majority + r.Int63n(numMembers-majority+1) // in interval [majority, numMembers]
}
voters := selectedCommittee.Members[:numVoters]
// schedule vote operations
var futureOps []simulation.FutureOperation
for _, v := range voters {
voteTime, err := RandomTime(r, ctx.BlockTime(), proposal.Deadline)
if err != nil {
return simulation.NoOpMsg(types.ModuleName), nil, fmt.Errorf("random time generation failed: %w", err)
}
fop := simulation.FutureOperation{
BlockTime: voteTime,
Op: SimulateMsgVote(k, ak, v, proposal.ID),
}
futureOps = append(futureOps, fop)
}
return submitOpMsg, futureOps, nil
}
}
func SimulateMsgVote(k keeper.Keeper, ak AccountKeeper, voter sdk.AccAddress, proposalID uint64) simulation.Operation {
return func(r *rand.Rand, app *baseapp.BaseApp, ctx sdk.Context, accs []simulation.Account, chainID string) (
opMsg simulation.OperationMsg, fOps []simulation.FutureOperation, err error) {
msg := types.NewMsgVote(voter, proposalID)
account := ak.GetAccount(ctx, voter)
fees, err := simulation.RandomFees(r, ctx, account.SpendableCoins(ctx.BlockTime()))
if err != nil {
return simulation.NoOpMsg(types.ModuleName), nil, err
}
voterAcc, found := simulation.FindAccount(accs, voter)
if !found {
return simulation.NoOpMsg(types.ModuleName), nil, fmt.Errorf("address not in account list")
}
tx := helpers.GenTx(
[]sdk.Msg{msg},
fees,
helpers.DefaultGenTxGas,
chainID,
[]uint64{account.GetAccountNumber()},
[]uint64{account.GetSequence()},
voterAcc.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
}
// to aid debugging, add the result log to the comment field
return simulation.NewOperationMsg(msg, true, result.Log), nil, nil
}
}