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validator.go
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validator.go
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package types
import (
"bytes"
"fmt"
"strings"
"time"
abci "github.com/tendermint/tendermint/abci/types"
"github.com/tendermint/tendermint/crypto"
tmtypes "github.com/tendermint/tendermint/types"
yaml "gopkg.in/yaml.v2"
"github.com/cosmos/cosmos-sdk/codec"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/x/staking/exported"
)
// nolint
const (
// TODO: Why can't we just have one string description which can be JSON by convention
MaxMonikerLength = 70
MaxIdentityLength = 3000
MaxWebsiteLength = 140
MaxDetailsLength = 280
)
// Implements Validator interface
var _ exported.ValidatorI = Validator{}
// Validator defines the total amount of bond shares and their exchange rate to
// coins. Slashing results in a decrease in the exchange rate, allowing correct
// calculation of future undelegations without iterating over delegators.
// When coins are delegated to this validator, the validator is credited with a
// delegation whose number of bond shares is based on the amount of coins delegated
// divided by the current exchange rate. Voting power can be calculated as total
// bonded shares multiplied by exchange rate.
type Validator struct {
OperatorAddress sdk.ValAddress `json:"operator_address" yaml:"operator_address"` // address of the validator's operator; bech encoded in JSON
ConsPubKey crypto.PubKey `json:"consensus_pubkey" yaml:"consensus_pubkey"` // the consensus public key of the validator; bech encoded in JSON
Jailed bool `json:"jailed" yaml:"jailed"` // has the validator been jailed from bonded status?
Status sdk.BondStatus `json:"status" yaml:"status"` // validator status (bonded/unbonding/unbonded)
Tokens sdk.Int `json:"tokens" yaml:"tokens"` // delegated tokens (incl. self-delegation)
DelegatorShares sdk.Dec `json:"delegator_shares" yaml:"delegator_shares"` // total shares issued to a validator's delegators
Description Description `json:"description" yaml:"description"` // description terms for the validator
UnbondingHeight int64 `json:"unbonding_height" yaml:"unbonding_height"` // if unbonding, height at which this validator has begun unbonding
UnbondingCompletionTime time.Time `json:"unbonding_time" yaml:"unbonding_time"` // if unbonding, min time for the validator to complete unbonding
Commission Commission `json:"commission" yaml:"commission"` // commission parameters
MinSelfDelegation sdk.Int `json:"min_self_delegation" yaml:"min_self_delegation"` // validator's self declared minimum self delegation
}
// custom marshal yaml function due to consensus pubkey
func (v Validator) MarshalYAML() (interface{}, error) {
bs, err := yaml.Marshal(struct {
OperatorAddress sdk.ValAddress
ConsPubKey string
Jailed bool
Status sdk.BondStatus
Tokens sdk.Int
DelegatorShares sdk.Dec
Description Description
UnbondingHeight int64
UnbondingCompletionTime time.Time
Commission Commission
MinSelfDelegation sdk.Int
}{
OperatorAddress: v.OperatorAddress,
ConsPubKey: sdk.MustBech32ifyConsPub(v.ConsPubKey),
Jailed: v.Jailed,
Status: v.Status,
Tokens: v.Tokens,
DelegatorShares: v.DelegatorShares,
Description: v.Description,
UnbondingHeight: v.UnbondingHeight,
UnbondingCompletionTime: v.UnbondingCompletionTime,
Commission: v.Commission,
MinSelfDelegation: v.MinSelfDelegation,
})
if err != nil {
return nil, err
}
return string(bs), nil
}
// Validators is a collection of Validator
type Validators []Validator
func (v Validators) String() (out string) {
for _, val := range v {
out += val.String() + "\n"
}
return strings.TrimSpace(out)
}
// ToSDKValidators - convenience function convert []Validators to []sdk.Validators
func (v Validators) ToSDKValidators() (validators []exported.ValidatorI) {
for _, val := range v {
validators = append(validators, val)
}
return validators
}
// NewValidator - initialize a new validator
func NewValidator(operator sdk.ValAddress, pubKey crypto.PubKey, description Description) Validator {
return Validator{
OperatorAddress: operator,
ConsPubKey: pubKey,
Jailed: false,
Status: sdk.Unbonded,
Tokens: sdk.ZeroInt(),
DelegatorShares: sdk.ZeroDec(),
Description: description,
UnbondingHeight: int64(0),
UnbondingCompletionTime: time.Unix(0, 0).UTC(),
Commission: NewCommission(sdk.ZeroDec(), sdk.ZeroDec(), sdk.ZeroDec()),
MinSelfDelegation: sdk.OneInt(),
}
}
// return the redelegation
func MustMarshalValidator(cdc *codec.Codec, validator Validator) []byte {
return cdc.MustMarshalBinaryLengthPrefixed(validator)
}
// unmarshal a redelegation from a store value
func MustUnmarshalValidator(cdc *codec.Codec, value []byte) Validator {
validator, err := UnmarshalValidator(cdc, value)
if err != nil {
panic(err)
}
return validator
}
// unmarshal a redelegation from a store value
func UnmarshalValidator(cdc *codec.Codec, value []byte) (validator Validator, err error) {
err = cdc.UnmarshalBinaryLengthPrefixed(value, &validator)
return validator, err
}
// String returns a human readable string representation of a validator.
func (v Validator) String() string {
bechConsPubKey, err := sdk.Bech32ifyConsPub(v.ConsPubKey)
if err != nil {
panic(err)
}
return fmt.Sprintf(`Validator
Operator Address: %s
Validator Consensus Pubkey: %s
Jailed: %v
Status: %s
Tokens: %s
Delegator Shares: %s
Description: %s
Unbonding Height: %d
Unbonding Completion Time: %v
Minimum Self Delegation: %v
Commission: %s`, v.OperatorAddress, bechConsPubKey,
v.Jailed, v.Status, v.Tokens,
v.DelegatorShares, v.Description,
v.UnbondingHeight, v.UnbondingCompletionTime, v.MinSelfDelegation, v.Commission)
}
// this is a helper struct used for JSON de- and encoding only
type bechValidator struct {
OperatorAddress sdk.ValAddress `json:"operator_address" yaml:"operator_address"` // the bech32 address of the validator's operator
ConsPubKey string `json:"consensus_pubkey" yaml:"consensus_pubkey"` // the bech32 consensus public key of the validator
Jailed bool `json:"jailed" yaml:"jailed"` // has the validator been jailed from bonded status?
Status sdk.BondStatus `json:"status" yaml:"status"` // validator status (bonded/unbonding/unbonded)
Tokens sdk.Int `json:"tokens" yaml:"tokens"` // delegated tokens (incl. self-delegation)
DelegatorShares sdk.Dec `json:"delegator_shares" yaml:"delegator_shares"` // total shares issued to a validator's delegators
Description Description `json:"description" yaml:"description"` // description terms for the validator
UnbondingHeight int64 `json:"unbonding_height" yaml:"unbonding_height"` // if unbonding, height at which this validator has begun unbonding
UnbondingCompletionTime time.Time `json:"unbonding_time" yaml:"unbonding_time"` // if unbonding, min time for the validator to complete unbonding
Commission Commission `json:"commission" yaml:"commission"` // commission parameters
MinSelfDelegation sdk.Int `json:"min_self_delegation" yaml:"min_self_delegation"` // minimum self delegation
}
// MarshalJSON marshals the validator to JSON using Bech32
func (v Validator) MarshalJSON() ([]byte, error) {
bechConsPubKey, err := sdk.Bech32ifyConsPub(v.ConsPubKey)
if err != nil {
return nil, err
}
return codec.Cdc.MarshalJSON(bechValidator{
OperatorAddress: v.OperatorAddress,
ConsPubKey: bechConsPubKey,
Jailed: v.Jailed,
Status: v.Status,
Tokens: v.Tokens,
DelegatorShares: v.DelegatorShares,
Description: v.Description,
UnbondingHeight: v.UnbondingHeight,
UnbondingCompletionTime: v.UnbondingCompletionTime,
MinSelfDelegation: v.MinSelfDelegation,
Commission: v.Commission,
})
}
// UnmarshalJSON unmarshals the validator from JSON using Bech32
func (v *Validator) UnmarshalJSON(data []byte) error {
bv := &bechValidator{}
if err := codec.Cdc.UnmarshalJSON(data, bv); err != nil {
return err
}
consPubKey, err := sdk.GetConsPubKeyBech32(bv.ConsPubKey)
if err != nil {
return err
}
*v = Validator{
OperatorAddress: bv.OperatorAddress,
ConsPubKey: consPubKey,
Jailed: bv.Jailed,
Tokens: bv.Tokens,
Status: bv.Status,
DelegatorShares: bv.DelegatorShares,
Description: bv.Description,
UnbondingHeight: bv.UnbondingHeight,
UnbondingCompletionTime: bv.UnbondingCompletionTime,
Commission: bv.Commission,
MinSelfDelegation: bv.MinSelfDelegation,
}
return nil
}
// only the vitals
func (v Validator) TestEquivalent(v2 Validator) bool {
return v.ConsPubKey.Equals(v2.ConsPubKey) &&
bytes.Equal(v.OperatorAddress, v2.OperatorAddress) &&
v.Status.Equal(v2.Status) &&
v.Tokens.Equal(v2.Tokens) &&
v.DelegatorShares.Equal(v2.DelegatorShares) &&
v.Description == v2.Description &&
v.Commission.Equal(v2.Commission)
}
// return the TM validator address
func (v Validator) ConsAddress() sdk.ConsAddress {
return sdk.ConsAddress(v.ConsPubKey.Address())
}
// IsBonded checks if the validator status equals Bonded
func (v Validator) IsBonded() bool {
return v.GetStatus().Equal(sdk.Bonded)
}
// IsUnbonded checks if the validator status equals Unbonded
func (v Validator) IsUnbonded() bool {
return v.GetStatus().Equal(sdk.Unbonded)
}
// IsUnbonding checks if the validator status equals Unbonding
func (v Validator) IsUnbonding() bool {
return v.GetStatus().Equal(sdk.Unbonding)
}
// constant used in flags to indicate that description field should not be updated
const DoNotModifyDesc = "[do-not-modify]"
// Description - description fields for a validator
type Description struct {
Moniker string `json:"moniker" yaml:"moniker"` // name
Identity string `json:"identity" yaml:"identity"` // optional identity signature (ex. UPort or Keybase)
Website string `json:"website" yaml:"website"` // optional website link
Details string `json:"details" yaml:"details"` // optional details
}
// NewDescription returns a new Description with the provided values.
func NewDescription(moniker, identity, website, details string) Description {
return Description{
Moniker: moniker,
Identity: identity,
Website: website,
Details: details,
}
}
// UpdateDescription updates the fields of a given description. An error is
// returned if the resulting description contains an invalid length.
func (d Description) UpdateDescription(d2 Description) (Description, sdk.Error) {
if d2.Moniker == DoNotModifyDesc {
d2.Moniker = d.Moniker
}
if d2.Identity == DoNotModifyDesc {
d2.Identity = d.Identity
}
if d2.Website == DoNotModifyDesc {
d2.Website = d.Website
}
if d2.Details == DoNotModifyDesc {
d2.Details = d.Details
}
return Description{
Moniker: d2.Moniker,
Identity: d2.Identity,
Website: d2.Website,
Details: d2.Details,
}.EnsureLength()
}
// EnsureLength ensures the length of a validator's description.
func (d Description) EnsureLength() (Description, sdk.Error) {
if len(d.Moniker) > MaxMonikerLength {
return d, ErrDescriptionLength(DefaultCodespace, "moniker", len(d.Moniker), MaxMonikerLength)
}
if len(d.Identity) > MaxIdentityLength {
return d, ErrDescriptionLength(DefaultCodespace, "identity", len(d.Identity), MaxIdentityLength)
}
if len(d.Website) > MaxWebsiteLength {
return d, ErrDescriptionLength(DefaultCodespace, "website", len(d.Website), MaxWebsiteLength)
}
if len(d.Details) > MaxDetailsLength {
return d, ErrDescriptionLength(DefaultCodespace, "details", len(d.Details), MaxDetailsLength)
}
return d, nil
}
// ABCIValidatorUpdate returns an abci.ValidatorUpdate from a staking validator type
// with the full validator power
func (v Validator) ABCIValidatorUpdate() abci.ValidatorUpdate {
return abci.ValidatorUpdate{
PubKey: tmtypes.TM2PB.PubKey(v.ConsPubKey),
Power: v.ConsensusPower(),
}
}
// ABCIValidatorUpdateZero returns an abci.ValidatorUpdate from a staking validator type
// with zero power used for validator updates.
func (v Validator) ABCIValidatorUpdateZero() abci.ValidatorUpdate {
return abci.ValidatorUpdate{
PubKey: tmtypes.TM2PB.PubKey(v.ConsPubKey),
Power: 0,
}
}
// SetInitialCommission attempts to set a validator's initial commission. An
// error is returned if the commission is invalid.
func (v Validator) SetInitialCommission(commission Commission) (Validator, sdk.Error) {
if err := commission.Validate(); err != nil {
return v, err
}
v.Commission = commission
return v, nil
}
// In some situations, the exchange rate becomes invalid, e.g. if
// Validator loses all tokens due to slashing. In this case,
// make all future delegations invalid.
func (v Validator) InvalidExRate() bool {
return v.Tokens.IsZero() && v.DelegatorShares.IsPositive()
}
// calculate the token worth of provided shares
func (v Validator) TokensFromShares(shares sdk.Dec) sdk.Dec {
return (shares.MulInt(v.Tokens)).Quo(v.DelegatorShares)
}
// calculate the token worth of provided shares, truncated
func (v Validator) TokensFromSharesTruncated(shares sdk.Dec) sdk.Dec {
return (shares.MulInt(v.Tokens)).QuoTruncate(v.DelegatorShares)
}
// TokensFromSharesRoundUp returns the token worth of provided shares, rounded
// up.
func (v Validator) TokensFromSharesRoundUp(shares sdk.Dec) sdk.Dec {
return (shares.MulInt(v.Tokens)).QuoRoundUp(v.DelegatorShares)
}
// SharesFromTokens returns the shares of a delegation given a bond amount. It
// returns an error if the validator has no tokens.
func (v Validator) SharesFromTokens(amt sdk.Int) (sdk.Dec, sdk.Error) {
if v.Tokens.IsZero() {
return sdk.ZeroDec(), ErrInsufficientShares(DefaultCodespace)
}
return v.GetDelegatorShares().MulInt(amt).QuoInt(v.GetTokens()), nil
}
// SharesFromTokensTruncated returns the truncated shares of a delegation given
// a bond amount. It returns an error if the validator has no tokens.
func (v Validator) SharesFromTokensTruncated(amt sdk.Int) (sdk.Dec, sdk.Error) {
if v.Tokens.IsZero() {
return sdk.ZeroDec(), ErrInsufficientShares(DefaultCodespace)
}
return v.GetDelegatorShares().MulInt(amt).QuoTruncate(v.GetTokens().ToDec()), nil
}
// get the bonded tokens which the validator holds
func (v Validator) BondedTokens() sdk.Int {
if v.IsBonded() {
return v.Tokens
}
return sdk.ZeroInt()
}
// get the consensus-engine power
// a reduction of 10^6 from validator tokens is applied
func (v Validator) ConsensusPower() int64 {
if v.IsBonded() {
return v.PotentialConsensusPower()
}
return 0
}
// potential consensus-engine power
func (v Validator) PotentialConsensusPower() int64 {
return sdk.TokensToConsensusPower(v.Tokens)
}
// UpdateStatus updates the location of the shares within a validator
// to reflect the new status
func (v Validator) UpdateStatus(newStatus sdk.BondStatus) Validator {
v.Status = newStatus
return v
}
// AddTokensFromDel adds tokens to a validator
func (v Validator) AddTokensFromDel(amount sdk.Int) (Validator, sdk.Dec) {
// calculate the shares to issue
var issuedShares sdk.Dec
if v.DelegatorShares.IsZero() {
// the first delegation to a validator sets the exchange rate to one
issuedShares = amount.ToDec()
} else {
shares, err := v.SharesFromTokens(amount)
if err != nil {
panic(err)
}
issuedShares = shares
}
v.Tokens = v.Tokens.Add(amount)
v.DelegatorShares = v.DelegatorShares.Add(issuedShares)
return v, issuedShares
}
// RemoveTokens removes tokens from a validator
func (v Validator) RemoveTokens(tokens sdk.Int) Validator {
if tokens.IsNegative() {
panic(fmt.Sprintf("should not happen: trying to remove negative tokens %v", tokens))
}
if v.Tokens.LT(tokens) {
panic(fmt.Sprintf("should not happen: only have %v tokens, trying to remove %v", v.Tokens, tokens))
}
v.Tokens = v.Tokens.Sub(tokens)
return v
}
// RemoveDelShares removes delegator shares from a validator.
// NOTE: because token fractions are left in the valiadator,
// the exchange rate of future shares of this validator can increase.
func (v Validator) RemoveDelShares(delShares sdk.Dec) (Validator, sdk.Int) {
remainingShares := v.DelegatorShares.Sub(delShares)
var issuedTokens sdk.Int
if remainingShares.IsZero() {
// last delegation share gets any trimmings
issuedTokens = v.Tokens
v.Tokens = sdk.ZeroInt()
} else {
// leave excess tokens in the validator
// however fully use all the delegator shares
issuedTokens = v.TokensFromShares(delShares).TruncateInt()
v.Tokens = v.Tokens.Sub(issuedTokens)
if v.Tokens.IsNegative() {
panic("attempting to remove more tokens than available in validator")
}
}
v.DelegatorShares = remainingShares
return v, issuedTokens
}
// nolint - for ValidatorI
func (v Validator) IsJailed() bool { return v.Jailed }
func (v Validator) GetMoniker() string { return v.Description.Moniker }
func (v Validator) GetStatus() sdk.BondStatus { return v.Status }
func (v Validator) GetOperator() sdk.ValAddress { return v.OperatorAddress }
func (v Validator) GetConsPubKey() crypto.PubKey { return v.ConsPubKey }
func (v Validator) GetConsAddr() sdk.ConsAddress { return sdk.ConsAddress(v.ConsPubKey.Address()) }
func (v Validator) GetTokens() sdk.Int { return v.Tokens }
func (v Validator) GetBondedTokens() sdk.Int { return v.BondedTokens() }
func (v Validator) GetConsensusPower() int64 { return v.ConsensusPower() }
func (v Validator) GetCommission() sdk.Dec { return v.Commission.Rate }
func (v Validator) GetMinSelfDelegation() sdk.Int { return v.MinSelfDelegation }
func (v Validator) GetDelegatorShares() sdk.Dec { return v.DelegatorShares }