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test_utils.go
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test_utils.go
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package types
import (
"fmt"
"math/rand"
"testing"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/stretchr/testify/require"
"github.com/tendermint/tendermint/crypto"
)
var (
pk1 = crypto.GenPrivKeyEd25519().PubKey()
pk2 = crypto.GenPrivKeyEd25519().PubKey()
pk3 = crypto.GenPrivKeyEd25519().PubKey()
addr1 = sdk.AccAddress(pk1.Address())
addr2 = sdk.AccAddress(pk2.Address())
addr3 = sdk.AccAddress(pk3.Address())
emptyAddr sdk.AccAddress
emptyPubkey crypto.PubKey
)
// Operation reflects any operation that transforms staking state. It takes in
// a RNG instance, pool, validator and returns an updated pool, updated
// validator, delta tokens, and descriptive message.
type Operation func(r *rand.Rand, pool Pool, c Validator) (Pool, Validator, int64, string)
// OpBondOrUnbond implements an operation that bonds or unbonds a validator
// depending on current status.
// nolint: unparam
func OpBondOrUnbond(r *rand.Rand, pool Pool, val Validator) (Pool, Validator, int64, string) {
var (
msg string
newStatus sdk.BondStatus
)
if val.Status() == sdk.Bonded {
msg = fmt.Sprintf("sdk.Unbonded previously bonded validator %s (poolShares: %v, delShares: %v, DelegatorShareExRate: %v)",
val.Owner, val.PoolShares.Bonded(), val.DelegatorShares, val.DelegatorShareExRate(pool))
newStatus = sdk.Unbonded
} else if val.Status() == sdk.Unbonded {
msg = fmt.Sprintf("sdk.Bonded previously unbonded validator %s (poolShares: %v, delShares: %v, DelegatorShareExRate: %v)",
val.Owner, val.PoolShares.Bonded(), val.DelegatorShares, val.DelegatorShareExRate(pool))
newStatus = sdk.Bonded
}
val, pool = val.UpdateStatus(pool, newStatus)
return pool, val, 0, msg
}
// OpAddTokens implements an operation that adds a random number of tokens to a
// validator.
func OpAddTokens(r *rand.Rand, pool Pool, val Validator) (Pool, Validator, int64, string) {
msg := fmt.Sprintf("validator %s (status: %d, poolShares: %v, delShares: %v, DelegatorShareExRate: %v)",
val.Owner, val.Status(), val.PoolShares.Bonded(), val.DelegatorShares, val.DelegatorShareExRate(pool))
tokens := int64(r.Int31n(1000))
val, pool, _ = val.AddTokensFromDel(pool, tokens)
msg = fmt.Sprintf("Added %d tokens to %s", tokens, msg)
// Tokens are removed so for accounting must be negative
return pool, val, -1 * tokens, msg
}
// OpRemoveShares implements an operation that removes a random number of
// shares from a validator.
func OpRemoveShares(r *rand.Rand, pool Pool, val Validator) (Pool, Validator, int64, string) {
var shares sdk.Rat
for {
shares = sdk.NewRat(int64(r.Int31n(1000)))
if shares.LT(val.DelegatorShares) {
break
}
}
msg := fmt.Sprintf("Removed %v shares from validator %s (status: %d, poolShares: %v, delShares: %v, DelegatorShareExRate: %v)",
shares, val.Owner, val.Status(), val.PoolShares, val.DelegatorShares, val.DelegatorShareExRate(pool))
val, pool, tokens := val.RemoveDelShares(pool, shares)
return pool, val, tokens, msg
}
// RandomOperation returns a random staking operation.
func RandomOperation(r *rand.Rand) Operation {
operations := []Operation{
OpBondOrUnbond,
OpAddTokens,
OpRemoveShares,
}
r.Shuffle(len(operations), func(i, j int) {
operations[i], operations[j] = operations[j], operations[i]
})
return operations[0]
}
// AssertInvariants ensures invariants that should always be true are true.
// nolint: unparam
func AssertInvariants(t *testing.T, msg string,
pOrig Pool, cOrig []Validator, pMod Pool, vMods []Validator, tokens int64) {
// total tokens conserved
require.Equal(t,
pOrig.UnbondedTokens+pOrig.BondedTokens,
pMod.UnbondedTokens+pMod.BondedTokens+tokens,
"Tokens not conserved - msg: %v\n, pOrig.PoolShares.Bonded(): %v, pOrig.PoolShares.Unbonded(): %v, pMod.PoolShares.Bonded(): %v, pMod.PoolShares.Unbonded(): %v, pOrig.UnbondedTokens: %v, pOrig.BondedTokens: %v, pMod.UnbondedTokens: %v, pMod.BondedTokens: %v, tokens: %v\n",
msg,
pOrig.BondedShares, pOrig.UnbondedShares,
pMod.BondedShares, pMod.UnbondedShares,
pOrig.UnbondedTokens, pOrig.BondedTokens,
pMod.UnbondedTokens, pMod.BondedTokens, tokens)
// Nonnegative bonded shares
require.False(t, pMod.BondedShares.LT(sdk.ZeroRat()),
"Negative bonded shares - msg: %v\npOrig: %v\npMod: %v\ntokens: %v\n",
msg, pOrig, pMod, tokens)
// Nonnegative unbonded shares
require.False(t, pMod.UnbondedShares.LT(sdk.ZeroRat()),
"Negative unbonded shares - msg: %v\npOrig: %v\npMod: %v\ntokens: %v\n",
msg, pOrig, pMod, tokens)
// Nonnegative bonded ex rate
require.False(t, pMod.BondedShareExRate().LT(sdk.ZeroRat()),
"Applying operation \"%s\" resulted in negative BondedShareExRate: %d",
msg, pMod.BondedShareExRate().RoundInt64())
// Nonnegative unbonded ex rate
require.False(t, pMod.UnbondedShareExRate().LT(sdk.ZeroRat()),
"Applying operation \"%s\" resulted in negative UnbondedShareExRate: %d",
msg, pMod.UnbondedShareExRate().RoundInt64())
for _, vMod := range vMods {
// Nonnegative ex rate
require.False(t, vMod.DelegatorShareExRate(pMod).LT(sdk.ZeroRat()),
"Applying operation \"%s\" resulted in negative validator.DelegatorShareExRate(): %v (validator.Owner: %s)",
msg,
vMod.DelegatorShareExRate(pMod),
vMod.Owner,
)
// Nonnegative poolShares
require.False(t, vMod.PoolShares.Bonded().LT(sdk.ZeroRat()),
"Applying operation \"%s\" resulted in negative validator.PoolShares.Bonded(): %v (validator.DelegatorShares: %v, validator.DelegatorShareExRate: %v, validator.Owner: %s)",
msg,
vMod.PoolShares.Bonded(),
vMod.DelegatorShares,
vMod.DelegatorShareExRate(pMod),
vMod.Owner,
)
// Nonnegative delShares
require.False(t, vMod.DelegatorShares.LT(sdk.ZeroRat()),
"Applying operation \"%s\" resulted in negative validator.DelegatorShares: %v (validator.PoolShares.Bonded(): %v, validator.DelegatorShareExRate: %v, validator.Owner: %s)",
msg,
vMod.DelegatorShares,
vMod.PoolShares.Bonded(),
vMod.DelegatorShareExRate(pMod),
vMod.Owner,
)
}
}
// TODO: refactor this random setup
// randomValidator generates a random validator.
// nolint: unparam
func randomValidator(r *rand.Rand, i int) Validator {
poolSharesAmt := sdk.NewRat(int64(r.Int31n(10000)))
delShares := sdk.NewRat(int64(r.Int31n(10000)))
var pShares PoolShares
if r.Float64() < float64(0.5) {
pShares = NewBondedShares(poolSharesAmt)
} else {
pShares = NewUnbondedShares(poolSharesAmt)
}
return Validator{
Owner: addr1,
PubKey: pk1,
PoolShares: pShares,
DelegatorShares: delShares,
}
}
// RandomSetup generates a random staking state.
func RandomSetup(r *rand.Rand, numValidators int) (Pool, []Validator) {
pool := InitialPool()
pool.LooseTokens = 100000
validators := make([]Validator, numValidators)
for i := 0; i < numValidators; i++ {
validator := randomValidator(r, i)
if validator.Status() == sdk.Bonded {
pool.BondedShares = pool.BondedShares.Add(validator.PoolShares.Bonded())
pool.BondedTokens += validator.PoolShares.Bonded().RoundInt64()
} else if validator.Status() == sdk.Unbonded {
pool.UnbondedShares = pool.UnbondedShares.Add(validator.PoolShares.Unbonded())
pool.UnbondedTokens += validator.PoolShares.Unbonded().RoundInt64()
}
validators[i] = validator
}
return pool, validators
}