Merge PR #4244: Param Proposal Simulation Messages; Minting Params Fix

2019-05-02 16:50:01 -04:00
parent 38f93128eb
commit 29ed730aff
9 changed files with 322 additions and 95 deletions
@@ -0,0 +1,136 @@
+package simulation
+
+import (
+	"fmt"
+	"math/rand"
+	"time"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/gov"
+	"github.com/cosmos/cosmos-sdk/x/params"
+	"github.com/cosmos/cosmos-sdk/x/simulation"
+)
+
+type simParamChange struct {
+	subspace string
+	key      string
+	subkey   string
+	simValue func(r *rand.Rand) string
+}
+
+func (spc simParamChange) compKey() string {
+	return fmt.Sprintf("%s/%s/%s", spc.subkey, spc.key, spc.subkey)
+}
+
+// paramChangePool defines a static slice of possible simulated parameter changes
+// where each simParamChange corresponds to a ParamChange with a simValue
+// function to generate a simulated new value.
+//
+// TODO: governance parameters (blocked on an upgrade to go-amino)
+var paramChangePool = []simParamChange{
+	// staking parameters
+	{
+		"staking",
+		"MaxValidators",
+		"",
+		func(r *rand.Rand) string {
+			return fmt.Sprintf("%d", simulation.ModuleParamSimulator["MaxValidators"](r).(uint16))
+		},
+	},
+	{
+		"staking",
+		"UnbondingTime",
+		"",
+		func(r *rand.Rand) string {
+			return fmt.Sprintf("\"%d\"", simulation.ModuleParamSimulator["UnbondingTime"](r).(time.Duration))
+		},
+	},
+	// slashing parameters
+	{
+		"slashing",
+		"SignedBlocksWindow",
+		"",
+		func(r *rand.Rand) string {
+			return fmt.Sprintf("\"%d\"", simulation.ModuleParamSimulator["SignedBlocksWindow"](r).(int64))
+		},
+	},
+	{
+		"slashing",
+		"MinSignedPerWindow",
+		"",
+		func(r *rand.Rand) string {
+			return fmt.Sprintf("\"%d\"", simulation.ModuleParamSimulator["MinSignedPerWindow"](r).(sdk.Dec))
+		},
+	},
+	{
+		"slashing",
+		"SlashFractionDowntime",
+		"",
+		func(r *rand.Rand) string {
+			return fmt.Sprintf("\"%d\"", simulation.ModuleParamSimulator["SlashFractionDowntime"](r).(sdk.Dec))
+		},
+	},
+	// minting parameters
+	{
+		"mint",
+		"InflationRateChange",
+		"",
+		func(r *rand.Rand) string {
+			return fmt.Sprintf("\"%d\"", simulation.ModuleParamSimulator["InflationRateChange"](r).(sdk.Dec))
+		},
+	},
+	// auth parameters
+	{
+		"auth",
+		"MaxMemoCharacters",
+		"",
+		func(r *rand.Rand) string {
+			return fmt.Sprintf("\"%d\"", simulation.ModuleParamSimulator["MaxMemoCharacters"](r).(uint64))
+		},
+	},
+	{
+		"auth",
+		"TxSigLimit",
+		"",
+		func(r *rand.Rand) string {
+			return fmt.Sprintf("\"%d\"", simulation.ModuleParamSimulator["TxSigLimit"](r).(uint64))
+		},
+	},
+	{
+		"auth",
+		"TxSizeCostPerByte",
+		"",
+		func(r *rand.Rand) string {
+			return fmt.Sprintf("\"%d\"", simulation.ModuleParamSimulator["TxSizeCostPerByte"](r).(uint64))
+		},
+	},
+}
+
+// SimulateParamChangeProposalContent returns random parameter change content.
+// It will generate a ParameterChangeProposal object with anywhere between 1 and
+// 3 parameter changes all of which have random, but valid values.
+func SimulateParamChangeProposalContent(r *rand.Rand) gov.Content {
+	numChanges := simulation.RandIntBetween(r, 1, len(paramChangePool)/2)
+	paramChanges := make([]params.ParamChange, numChanges, numChanges)
+	paramChangesKeys := make(map[string]struct{})
+
+	for i := 0; i < numChanges; i++ {
+		spc := paramChangePool[r.Intn(len(paramChangePool))]
+
+		// do not include duplicate parameter changes for a given subspace/key
+		_, ok := paramChangesKeys[spc.compKey()]
+		for ok {
+			spc = paramChangePool[r.Intn(len(paramChangePool))]
+			_, ok = paramChangesKeys[spc.compKey()]
+		}
+
+		paramChangesKeys[spc.compKey()] = struct{}{}
+		paramChanges[i] = params.NewParamChange(spc.subspace, spc.key, spc.subkey, spc.simValue(r))
+	}
+
+	return params.NewParameterChangeProposal(
+		simulation.RandStringOfLength(r, 140),
+		simulation.RandStringOfLength(r, 5000),
+		paramChanges,
+	)
+}