cosmos-sdk/x/stake/types.go

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package stake
import (
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sdk "github.com/cosmos/cosmos-sdk/types"
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crypto "github.com/tendermint/go-crypto"
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"github.com/cosmos/cosmos-sdk/wire"
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)
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// GenesisState - all staking state that must be provided at genesis
type GenesisState struct {
Pool Pool `json:"pool"`
Params Params `json:"params"`
Candidates []Candidate `json:"candidates"`
Bonds []DelegatorBond `json:"bonds"`
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}
//_________________________________________________________________________
// Params defines the high level settings for staking
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type Params struct {
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InflationRateChange sdk.Rat `json:"inflation_rate_change"` // maximum annual change in inflation rate
InflationMax sdk.Rat `json:"inflation_max"` // maximum inflation rate
InflationMin sdk.Rat `json:"inflation_min"` // minimum inflation rate
GoalBonded sdk.Rat `json:"goal_bonded"` // Goal of percent bonded atoms
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MaxValidators uint16 `json:"max_validators"` // maximum number of validators
BondDenom string `json:"bond_denom"` // bondable coin denomination
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}
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func (p Params) equal(p2 Params) bool {
return p.InflationRateChange.Equal(p2.InflationRateChange) &&
p.InflationMax.Equal(p2.InflationMax) &&
p.InflationMin.Equal(p2.InflationMin) &&
p.GoalBonded.Equal(p2.GoalBonded) &&
p.MaxValidators == p2.MaxValidators &&
p.BondDenom == p2.BondDenom
}
//_________________________________________________________________________
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// Pool - dynamic parameters of the current state
type Pool struct {
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TotalSupply int64 `json:"total_supply"` // total supply of all tokens
BondedShares sdk.Rat `json:"bonded_shares"` // sum of all shares distributed for the Bonded Pool
UnbondedShares sdk.Rat `json:"unbonded_shares"` // sum of all shares distributed for the Unbonded Pool
BondedPool int64 `json:"bonded_pool"` // reserve of bonded tokens
UnbondedPool int64 `json:"unbonded_pool"` // reserve of unbonded tokens held with candidates
InflationLastTime int64 `json:"inflation_last_time"` // block which the last inflation was processed // TODO make time
Inflation sdk.Rat `json:"inflation"` // current annual inflation rate
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}
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func (p Pool) equal(p2 Pool) bool {
return p.BondedShares.Equal(p2.BondedShares) &&
p.UnbondedShares.Equal(p2.UnbondedShares) &&
p.Inflation.Equal(p2.Inflation) &&
p.TotalSupply == p2.TotalSupply &&
p.BondedPool == p2.BondedPool &&
p.UnbondedPool == p2.UnbondedPool &&
p.InflationLastTime == p2.InflationLastTime
}
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//_________________________________________________________________________
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// CandidateStatus - status of a validator-candidate
type CandidateStatus byte
const (
// nolint
Bonded CandidateStatus = 0x00
Unbonded CandidateStatus = 0x01
Revoked CandidateStatus = 0x02
)
// Candidate defines the total amount of bond shares and their exchange rate to
// coins. Accumulation of interest is modelled as an in increase in the
// exchange rate, and slashing as a decrease. When coins are delegated to this
// candidate, the candidate is credited with a DelegatorBond 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 bonds multiplied by
// exchange rate.
type Candidate struct {
Status CandidateStatus `json:"status"` // Bonded status
Address sdk.Address `json:"owner"` // Sender of BondTx - UnbondTx returns here
PubKey crypto.PubKey `json:"pub_key"` // Pubkey of candidate
Assets sdk.Rat `json:"assets"` // total shares of a global hold pools
Liabilities sdk.Rat `json:"liabilities"` // total shares issued to a candidate's delegators
Description Description `json:"description"` // Description terms for the candidate
ValidatorBondHeight int64 `json:"validator_bond_height"` // Earliest height as a bonded validator
ValidatorBondCounter int16 `json:"validator_bond_counter"` // Block-local tx index of validator change
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}
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// Candidates - list of Candidates
type Candidates []Candidate
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// NewCandidate - initialize a new candidate
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func NewCandidate(address sdk.Address, pubKey crypto.PubKey, description Description) Candidate {
return Candidate{
Status: Unbonded,
Address: address,
PubKey: pubKey,
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Assets: sdk.ZeroRat(),
Liabilities: sdk.ZeroRat(),
Description: description,
ValidatorBondHeight: int64(0),
ValidatorBondCounter: int16(0),
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}
}
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// Description - description fields for a candidate
type Description struct {
Moniker string `json:"moniker"`
Identity string `json:"identity"`
Website string `json:"website"`
Details string `json:"details"`
}
func NewDescription(moniker, identity, website, details string) Description {
return Description{
Moniker: moniker,
Identity: identity,
Website: website,
Details: details,
}
}
// get the exchange rate of global pool shares over delegator shares
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func (c Candidate) delegatorShareExRate() sdk.Rat {
if c.Liabilities.IsZero() {
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return sdk.OneRat()
}
return c.Assets.Quo(c.Liabilities)
}
// Validator returns a copy of the Candidate as a Validator.
// Should only be called when the Candidate qualifies as a validator.
func (c Candidate) validator() Validator {
return Validator{
Address: c.Address,
PubKey: c.PubKey,
Power: c.Assets,
Height: c.ValidatorBondHeight,
Counter: c.ValidatorBondCounter,
}
}
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//XXX updateDescription function
//XXX enforce limit to number of description characters
//______________________________________________________________________
// Validator is one of the top Candidates
type Validator struct {
Address sdk.Address `json:"address"`
PubKey crypto.PubKey `json:"pub_key"`
Power sdk.Rat `json:"voting_power"`
Height int64 `json:"height"` // Earliest height as a validator
Counter int16 `json:"counter"` // Block-local tx index for resolving equal voting power & height
}
// abci validator from stake validator type
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func (v Validator) abciValidator(cdc *wire.Codec) sdk.Validator {
return sdk.Validator{
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PubKey: v.PubKey.Bytes(),
Power: v.Power.Evaluate(),
}
}
// abci validator from stake validator type
// with zero power used for validator updates
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func (v Validator) abciValidatorZero(cdc *wire.Codec) sdk.Validator {
return sdk.Validator{
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PubKey: v.PubKey.Bytes(),
Power: 0,
}
}
//_________________________________________________________________________
// DelegatorBond represents the bond with tokens held by an account. It is
// owned by one delegator, and is associated with the voting power of one
// pubKey.
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// TODO better way of managing space
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type DelegatorBond struct {
DelegatorAddr sdk.Address `json:"delegator_addr"`
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CandidateAddr sdk.Address `json:"candidate_addr"`
Shares sdk.Rat `json:"shares"`
Height int64 `json:"height"` // Last height bond updated
}