257 lines
9.5 KiB
Go
257 lines
9.5 KiB
Go
package stake
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import (
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"bytes"
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sdk "github.com/cosmos/cosmos-sdk/types"
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"github.com/cosmos/cosmos-sdk/wire"
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abci "github.com/tendermint/abci/types"
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crypto "github.com/tendermint/go-crypto"
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)
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// Validator defines the total amount of bond shares and their exchange rate to
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// coins. Accumulation of interest is modelled as an in increase in the
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// exchange rate, and slashing as a decrease. When coins are delegated to this
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// validator, the validator is credited with a Delegation whose number of
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// bond shares is based on the amount of coins delegated divided by the current
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// exchange rate. Voting power can be calculated as total bonds multiplied by
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// exchange rate.
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type Validator struct {
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Owner sdk.Address `json:"owner"` // sender of BondTx - UnbondTx returns here
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PubKey crypto.PubKey `json:"pub_key"` // pubkey of validator
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Revoked bool `json:"revoked"` // has the validator been revoked from bonded status?
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RevokedUntilTime int64 `json:"revoked_until_time"` // timestamp before which the validator cannot unrevoke
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PoolShares PoolShares `json:"pool_shares"` // total shares for tokens held in the pool
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DelegatorShares sdk.Rat `json:"delegator_shares"` // total shares issued to a validator's delegators
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Description Description `json:"description"` // description terms for the validator
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BondHeight int64 `json:"bond_height"` // earliest height as a bonded validator
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BondIntraTxCounter int16 `json:"bond_intra_tx_counter"` // block-local tx index of validator change
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ProposerRewardPool sdk.Coins `json:"proposer_reward_pool"` // XXX reward pool collected from being the proposer
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Commission sdk.Rat `json:"commission"` // XXX the commission rate of fees charged to any delegators
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CommissionMax sdk.Rat `json:"commission_max"` // XXX maximum commission rate which this validator can ever charge
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CommissionChangeRate sdk.Rat `json:"commission_change_rate"` // XXX maximum daily increase of the validator commission
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CommissionChangeToday sdk.Rat `json:"commission_change_today"` // XXX commission rate change today, reset each day (UTC time)
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// fee related
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PrevBondedShares sdk.Rat `json:"prev_bonded_shares"` // total shares of a global hold pools
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}
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// Validators - list of Validators
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type Validators []Validator
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// NewValidator - initialize a new validator
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func NewValidator(owner sdk.Address, pubKey crypto.PubKey, description Description) Validator {
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return Validator{
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Owner: owner,
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PubKey: pubKey,
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Revoked: false,
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RevokedUntilTime: int64(0),
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PoolShares: NewUnbondedShares(sdk.ZeroRat()),
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DelegatorShares: sdk.ZeroRat(),
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Description: description,
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BondHeight: int64(0),
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BondIntraTxCounter: int16(0),
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ProposerRewardPool: sdk.Coins{},
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Commission: sdk.ZeroRat(),
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CommissionMax: sdk.ZeroRat(),
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CommissionChangeRate: sdk.ZeroRat(),
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CommissionChangeToday: sdk.ZeroRat(),
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PrevBondedShares: sdk.ZeroRat(),
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}
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}
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// only the vitals - does not check bond height of IntraTxCounter
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func (v Validator) equal(c2 Validator) bool {
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return v.PubKey.Equals(c2.PubKey) &&
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bytes.Equal(v.Owner, c2.Owner) &&
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v.PoolShares.Equal(c2.PoolShares) &&
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v.DelegatorShares.Equal(c2.DelegatorShares) &&
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v.Description == c2.Description &&
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//v.BondHeight == c2.BondHeight &&
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//v.BondIntraTxCounter == c2.BondIntraTxCounter && // counter is always changing
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v.ProposerRewardPool.IsEqual(c2.ProposerRewardPool) &&
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v.Commission.Equal(c2.Commission) &&
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v.CommissionMax.Equal(c2.CommissionMax) &&
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v.CommissionChangeRate.Equal(c2.CommissionChangeRate) &&
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v.CommissionChangeToday.Equal(c2.CommissionChangeToday) &&
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v.PrevBondedShares.Equal(c2.PrevBondedShares)
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}
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// Description - description fields for a validator
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type Description struct {
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Moniker string `json:"moniker"`
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Identity string `json:"identity"`
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Website string `json:"website"`
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Details string `json:"details"`
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}
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func NewDescription(moniker, identity, website, details string) Description {
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return Description{
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Moniker: moniker,
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Identity: identity,
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Website: website,
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Details: details,
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}
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}
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//XXX updateDescription function which enforce limit to number of description characters
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// abci validator from stake validator type
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func (v Validator) abciValidator(cdc *wire.Codec) abci.Validator {
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return abci.Validator{
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PubKey: v.PubKey.Bytes(),
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Power: v.PoolShares.Bonded().Evaluate(),
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}
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}
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// abci validator from stake validator type
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// with zero power used for validator updates
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func (v Validator) abciValidatorZero(cdc *wire.Codec) abci.Validator {
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return abci.Validator{
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PubKey: v.PubKey.Bytes(),
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Power: 0,
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}
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}
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// abci validator from stake validator type
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func (v Validator) Status() sdk.BondStatus {
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return v.PoolShares.Status
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}
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// update the location of the shares within a validator if its bond status has changed
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func (v Validator) UpdateStatus(pool Pool, NewStatus sdk.BondStatus) (Validator, Pool) {
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var tokens int64
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switch v.Status() {
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case sdk.Unbonded:
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if NewStatus == sdk.Unbonded {
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return v, pool
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}
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pool, tokens = pool.removeSharesUnbonded(v.PoolShares.Amount)
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case sdk.Unbonding:
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if NewStatus == sdk.Unbonding {
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return v, pool
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}
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pool, tokens = pool.removeSharesUnbonding(v.PoolShares.Amount)
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case sdk.Bonded:
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if NewStatus == sdk.Bonded { // return if nothing needs switching
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return v, pool
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}
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pool, tokens = pool.removeSharesBonded(v.PoolShares.Amount)
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}
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switch NewStatus {
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case sdk.Unbonded:
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pool, v.PoolShares = pool.addTokensUnbonded(tokens)
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case sdk.Unbonding:
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pool, v.PoolShares = pool.addTokensUnbonding(tokens)
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case sdk.Bonded:
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pool, v.PoolShares = pool.addTokensBonded(tokens)
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}
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return v, pool
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}
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// Remove & burn pool shares, e.g. when slashing a validator
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func (v Validator) removePoolShares(pool Pool, amt sdk.Rat) (Validator, Pool, int64) {
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var tokens int64
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switch v.Status() {
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case sdk.Unbonded:
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pool, tokens = pool.removeSharesUnbonded(amt)
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case sdk.Unbonding:
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pool, tokens = pool.removeSharesUnbonding(amt)
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case sdk.Bonded:
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pool, tokens = pool.removeSharesBonded(amt)
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}
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v.PoolShares.Amount = v.PoolShares.Amount.Sub(amt)
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return v, pool, tokens
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}
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// XXX TEST
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// get the power or potential power for a validator
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// if bonded, the power is the BondedShares
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// if not bonded, the power is the amount of bonded shares which the
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// the validator would have it was bonded
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func (v Validator) EquivalentBondedShares(pool Pool) (eqBondedShares sdk.Rat) {
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return v.PoolShares.ToBonded(pool).Amount
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}
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//_________________________________________________________________________________________________________
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// XXX Audit this function further to make sure it's correct
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// add tokens to a validator
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func (v Validator) addTokensFromDel(pool Pool,
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amount int64) (validator2 Validator, p2 Pool, issuedDelegatorShares sdk.Rat) {
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exRate := v.DelegatorShareExRate(pool) // bshr/delshr
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var poolShares PoolShares
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var equivalentBondedShares sdk.Rat
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switch v.Status() {
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case sdk.Unbonded:
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pool, poolShares = pool.addTokensUnbonded(amount)
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case sdk.Unbonding:
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pool, poolShares = pool.addTokensUnbonding(amount)
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case sdk.Bonded:
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pool, poolShares = pool.addTokensBonded(amount)
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}
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v.PoolShares.Amount = v.PoolShares.Amount.Add(poolShares.Amount)
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equivalentBondedShares = poolShares.ToBonded(pool).Amount
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issuedDelegatorShares = equivalentBondedShares.Quo(exRate) // bshr/(bshr/delshr) = delshr
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v.DelegatorShares = v.DelegatorShares.Add(issuedDelegatorShares)
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return v, pool, issuedDelegatorShares
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}
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// remove delegator shares from a validator
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// NOTE this function assumes the shares have already been updated for the validator status
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func (v Validator) removeDelShares(pool Pool,
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delShares sdk.Rat) (validator2 Validator, p2 Pool, createdCoins int64) {
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amount := v.DelegatorShareExRate(pool).Mul(delShares)
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eqBondedSharesToRemove := NewBondedShares(amount)
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v.DelegatorShares = v.DelegatorShares.Sub(delShares)
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switch v.Status() {
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case sdk.Unbonded:
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unbondedShares := eqBondedSharesToRemove.ToUnbonded(pool).Amount
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pool, createdCoins = pool.removeSharesUnbonded(unbondedShares)
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v.PoolShares.Amount = v.PoolShares.Amount.Sub(unbondedShares)
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case sdk.Unbonding:
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unbondingShares := eqBondedSharesToRemove.ToUnbonding(pool).Amount
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pool, createdCoins = pool.removeSharesUnbonding(unbondingShares)
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v.PoolShares.Amount = v.PoolShares.Amount.Sub(unbondingShares)
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case sdk.Bonded:
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pool, createdCoins = pool.removeSharesBonded(eqBondedSharesToRemove.Amount)
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v.PoolShares.Amount = v.PoolShares.Amount.Sub(eqBondedSharesToRemove.Amount)
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}
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return v, pool, createdCoins
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}
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// get the exchange rate of tokens over delegator shares
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// UNITS: eq-val-bonded-shares/delegator-shares
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func (v Validator) DelegatorShareExRate(pool Pool) sdk.Rat {
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if v.DelegatorShares.IsZero() {
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return sdk.OneRat()
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}
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eqBondedShares := v.PoolShares.ToBonded(pool).Amount
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return eqBondedShares.Quo(v.DelegatorShares)
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}
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//______________________________________________________________________
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// ensure fulfills the sdk validator types
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var _ sdk.Validator = Validator{}
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// nolint - for sdk.Validator
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func (v Validator) GetStatus() sdk.BondStatus { return v.Status() }
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func (v Validator) GetOwner() sdk.Address { return v.Owner }
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func (v Validator) GetPubKey() crypto.PubKey { return v.PubKey }
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func (v Validator) GetPower() sdk.Rat { return v.PoolShares.Bonded() }
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func (v Validator) GetBondHeight() int64 { return v.BondHeight }
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