types

package
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Published: Jun 8, 2020 License: Apache-2.0 Imports: 6 Imported by: 0

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Index

Constants

View Source
const (
	// ModuleName is the name of the oracle module
	ModuleName = "oracle"

	// StoreKey is the string store representation
	StoreKey = ModuleName

	// QuerierRoute is the querier route for the oracle module
	QuerierRoute = ModuleName

	// RouterKey is the msg router key for the oracle module
	RouterKey = ModuleName
)
View Source
const DefaultConsensusNeeded float64 = 0.7

DefaultConsensusNeeded defines the default consensus value required for a prophecy to be finalized

Variables

View Source
var (
	ErrProphecyNotFound              = sdkerrors.Register(ModuleName, 1, "prophecy with given id not found")
	ErrMinimumConsensusNeededInvalid = sdkerrors.Register(ModuleName, 2,
		"minimum consensus proportion of validator staking power must be > 0 and <= 1")
	ErrNoClaims          = sdkerrors.Register(ModuleName, 3, "cannot create prophecy without initial claim")
	ErrInvalidIdentifier = sdkerrors.Register(ModuleName, 4,
		"invalid identifier provided, must be a nonempty string")
	ErrProphecyFinalized = sdkerrors.Register(ModuleName, 5, "prophecy already finalized")
	ErrDuplicateMessage  = sdkerrors.Register(ModuleName, 6,
		"already processed message from validator for this id")
	ErrInvalidClaim     = sdkerrors.Register(ModuleName, 7, "claim cannot be empty string")
	ErrInvalidValidator = sdkerrors.Register(ModuleName, 8, "claim must be made by actively bonded validator")
	ErrInternalDB       = sdkerrors.Register(ModuleName, 9, " failed prophecy serialization/deserialization")
)

Exported code type numbers

View Source
var StatusTextToString = [...]string{"pending", "success", "failed"}
View Source
var StringToStatusText = map[string]StatusText{
	"pending": PendingStatusText,
	"success": SuccessStatusText,
	"failed":  FailedStatusText,
}

Functions

This section is empty.

Types

type Claim

type Claim struct {
	ID               string         `json:"id"`
	ValidatorAddress sdk.ValAddress `json:"validator_address"`
	Content          string         `json:"content"`
}

Claim contrains an arbitrary claim with arbitrary content made by a given validator

func NewClaim

func NewClaim(id string, validatorAddress sdk.ValAddress, content string) Claim

NewClaim returns a new Claim

type DBProphecy

type DBProphecy struct {
	ID              string `json:"id"`
	Status          Status `json:"status"`
	ClaimValidators []byte `json:"claim_validators"`
	ValidatorClaims []byte `json:"validator_claims"`
}

DBProphecy is what the prophecy becomes when being saved to the database.

Tendermint/Amino does not support maps so we must serialize those variables into bytes.

func (DBProphecy) DeserializeFromDB

func (dbProphecy DBProphecy) DeserializeFromDB() (Prophecy, error)

DeserializeFromDB deserializes a DBProphecy into a prophecy

type Prophecy

type Prophecy struct {
	ID     string `json:"id"`
	Status Status `json:"status"`

	//This is a mapping from a claim to the list of validators that made that claim.
	ClaimValidators map[string][]sdk.ValAddress `json:"claim_validators"`
	//This is a mapping from a validator bech32 address to their claim
	ValidatorClaims map[string]string `json:"validator_claims"`
}

Prophecy is a struct that contains all the metadata of an oracle ritual. Claims are indexed by the claim's validator bech32 address and by the claim's json value to allow for constant lookup times for any validation/verifiation checks of duplicate claims Each transaction, pending potential results are also calculated, stored and indexed by their byte result to allow discovery of consensus on any the result in constant time without having to sort or run through the list of claims to find the one with highest consensus

func NewProphecy

func NewProphecy(id string) Prophecy

NewProphecy returns a new Prophecy, initialized in pending status with an initial claim

func (Prophecy) AddClaim

func (prophecy Prophecy) AddClaim(validator sdk.ValAddress, claim string)

AddClaim adds a given claim to this prophecy

func (Prophecy) FindHighestClaim

func (prophecy Prophecy) FindHighestClaim(ctx sdk.Context, stakeKeeper StakingKeeper) (string, int64, int64)

FindHighestClaim looks through all the existing claims on a given prophecy. It adds up the total power across all claims and returns the highest claim, power for that claim, and total power claimed on the prophecy overall.

func (Prophecy) SerializeForDB

func (prophecy Prophecy) SerializeForDB() (DBProphecy, error)

SerializeForDB serializes a prophecy into a DBProphecy TODO: Using gob here may mean that different tendermint clients in different languages may serialize/store prophecies in their db in different ways - check with @codereviewer if this is ok or if it introduces a risk of creating forks. Or maybe using a slower json serializer or Amino:JSON would be ok

type StakingKeeper

type StakingKeeper interface {
	GetValidator(ctx sdk.Context, addr sdk.ValAddress) (validator staking.Validator, found bool)
	GetLastValidatorPower(ctx sdk.Context, operator sdk.ValAddress) (power int64)
	GetLastTotalPower(ctx sdk.Context) (power sdk.Int)
	GetBondedValidatorsByPower(ctx sdk.Context) []staking.Validator
}

StakingKeeper defines the expected staking keeper

type Status

type Status struct {
	Text       StatusText `json:"text"`
	FinalClaim string     `json:"final_claim"`
}

Status is a struct that contains the status of a given prophecy

func NewStatus

func NewStatus(text StatusText, finalClaim string) Status

NewStatus returns a new Status with the given data contained

type StatusText

type StatusText int

StatusText is an enum used to represent the status of the prophecy

const (
	PendingStatusText StatusText = iota
	SuccessStatusText
	FailedStatusText
)

func (StatusText) MarshalJSON

func (text StatusText) MarshalJSON() ([]byte, error)

func (StatusText) String

func (text StatusText) String() string

func (*StatusText) UnmarshalJSON

func (text *StatusText) UnmarshalJSON(b []byte) error

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