utils

package
v0.6.0 Latest Latest
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 Go to latest Published: Jun 25, 2019 License: MIT Imports: 29 Imported by: 0

Documentation

Overview

Package utils is used for the common functions for dealing with conversion to and from hex, bytes, and strings, formatting time.

Index

Constants

View Source 
const (
	// FormatBytes encodes the output as bytes
	FormatBytes = "bytes"
	// FormatUint256 encodes the output as bytes containing a uint256
	FormatUint256 = "uint256"
	// FormatInt256 encodes the output as bytes containing an int256
	FormatInt256 = "int256"
	// FormatBool encodes the output as bytes containing a bool
	FormatBool = "bool"
)
View Source 
const (
	// HumanTimeFormat is the predefined layout for use in Time.Format and time.Parse
	HumanTimeFormat = "2006-01-02 15:04:05 MST"
	// EVMWordByteLen the length of an EVM Word Byte
	EVMWordByteLen = 32
	// EVMWordHexLen the length of an EVM Word Hex
	EVMWordHexLen = EVMWordByteLen * 2
)
View Source 
const NewBytes32Length = 32

NewBytes32Length holds the length of bytes needed for Bytes32ID.

Variables

View Source 
var (

	// MaxUint256 represents the largest number represented by an EVM word
	MaxUint256 = &big.Int{}
	// MaxInt256 represents the largest number represented by an EVM word using
	// signed encoding.
	MaxInt256 = &big.Int{}
	// MinInt256 represents the smallest number represented by an EVM word using
	// signed encoding.
	MinInt256 = &big.Int{}
)

"Constants" used by EVM words

View Source 
var ZeroAddress = common.Address{}

ZeroAddress is an empty address, otherwise in Ethereum as 0x0000000000000000000000000000000000000000

Functions

func AddHexPrefix 

func AddHexPrefix(str string) string

AddHexPrefix adds the previx (0x) to a given hex string.

func CheckPasswordHash 

func CheckPasswordHash(password, hash string) bool

CheckPasswordHash wraps around bcrypt.CompareHashAndPassword for a friendlier API.

func CoerceInterfaceMapToStringMap 

func CoerceInterfaceMapToStringMap(in interface{}) (interface{}, error)

CoerceInterfaceMapToStringMap converts map[interface{}]interface{} (interface maps) to map[string]interface{} (string maps) and []interface{} with interface maps to string maps. Relevant when serializing between CBOR and JSON.

func ConcatBytes 

func ConcatBytes(bufs ...[]byte) ([]byte, error)

ConcatBytes appends a bunch of byte arrays into a single byte array

func DecodeEthereumTx 

func DecodeEthereumTx(hex string) (types.Transaction, error)

DecodeEthereumTx takes an RLP hex encoded Ethereum transaction and returns a Transaction struct with all the fields accessible.

func DurationFromNow 

func DurationFromNow(t time.Time) time.Duration

DurationFromNow returns the amount of time since the Time field was last updated.

func EIP55CapitalizedAddress 

func EIP55CapitalizedAddress(possibleAddressString string) bool

EIP55CapitalizedAddress returns true iff possibleAddressString has the correct capitalization for an Ethereum address, per EIP 55

func EVMEncodeBytes 

func EVMEncodeBytes(input []byte) ([]byte, error)

EVMEncodeBytes encodes arbitrary bytes as bytes expected by the EVM

func EVMTranscodeBool 

func EVMTranscodeBool(value gjson.Result) ([]byte, error)

EVMTranscodeBool converts a json input to an EVM bool

func EVMTranscodeBytes 

func EVMTranscodeBytes(value gjson.Result) ([]byte, error)

EVMTranscodeBytes converts a json input to an EVM bytes array

func EVMTranscodeInt256 

func EVMTranscodeInt256(value gjson.Result) ([]byte, error)

EVMTranscodeInt256 converts a json input to an EVM int256

func EVMTranscodeJSONWithFormat 

func EVMTranscodeJSONWithFormat(value gjson.Result, format string) ([]byte, error)

EVMTranscodeJSONWithFormat given a JSON input and a format specifier, encode the value for use by the EVM

func EVMTranscodeUint256 

func EVMTranscodeUint256(value gjson.Result) ([]byte, error)

EVMTranscodeUint256 converts a json input to an EVM uint256

func EVMWordBigInt 

func EVMWordBigInt(val *big.Int) ([]byte, error)

EVMWordBigInt returns a big.Int as an EVM word byte array, with support for a signed representation. Returns error on overflow.

func EVMWordSignedBigInt 

func EVMWordSignedBigInt(val *big.Int) ([]byte, error)

EVMWordSignedBigInt returns a big.Int as an EVM word byte array, with support for a signed representation. Returns error on overflow.

func EVMWordUint64 

func EVMWordUint64(val uint64) []byte

EVMWordUint64 returns a uint64 as an EVM word byte array.

func EncodeTxToHex 

func EncodeTxToHex(tx *types.Transaction) (string, error)

EncodeTxToHex converts the given Ethereum Transaction type and returns its hex-value string.

func FileContents 

func FileContents(path string) (string, error)

FileContents returns the contents of a file as a string.

func FileExists 

func FileExists(name string) bool

FileExists returns true if a file at the passed string exists.

func FilesInDir 

func FilesInDir(dir string) ([]string, error)

FilesInDir returns an array of filenames in the directory.

func FormatJSON 

func FormatJSON(v interface{}) ([]byte, error)

FormatJSON applies indent to format a JSON response.

func HasHexPrefix 

func HasHexPrefix(str string) bool

HasHexPrefix returns true if the string starts with 0x.

func HashPassword 

func HashPassword(password string) (string, error)

HashPassword wraps around bcrypt.GenerateFromPassword for a friendlier API.

func HexToUint64 

func HexToUint64(hex string) (uint64, error)

HexToUint64 converts a given hex string to 64-bit unsigned integer.

func ISO8601UTC 

func ISO8601UTC(t time.Time) string

ISO8601UTC formats given time to ISO8601.

func IsEmptyAddress 

func IsEmptyAddress(addr common.Address) bool

IsEmptyAddress checks that the address is empty, synonymous with the zero account/address. No logs can come from this address, as there is no contract present there.

See https://stackoverflow.com/questions/48219716/what-is-address0-in-solidity for the more info on the zero address.

func IsQuoted 

func IsQuoted(input []byte) bool

IsQuoted checks if the first and last characters are either " or '.

func JustError 

func JustError(_ interface{}, err error) error

JustError takes a tuple and returns the last entry, the error.

func Keccak256 

func Keccak256(in []byte) ([]byte, error)

Keccak256 is a simplified interface for the legacy SHA3 implementation that Ethereum uses.

func LogListeningAddress 

func LogListeningAddress(address common.Address) string

LogListeningAddress returns the LogListeningAddress

func MaxInt 

func MaxInt(ints ...int) int

MaxInt finds the maximum value of a list of ints.

func MaxUint32 

func MaxUint32(uints ...uint32) uint32

MaxUint32 finds the maximum value of a list of uint32s.

func MaxUint64 

func MaxUint64(uints ...uint64) uint64

MaxUint64 finds the maximum value of a list of uint64s.

func MinBigs 

func MinBigs(first *big.Int, bigs ...*big.Int) *big.Int

MinBigs finds the minimum value of a list of big.Ints.

func MustHash 

func MustHash(in string) common.Hash

MustHash returns the keccak256 hash, or panics on failure.

func NewBytes32ID 

func NewBytes32ID() string

NewBytes32ID returns a randomly generated UUID that conforms to Ethereum bytes32.

func NormalizedJSON 

func NormalizedJSON(val []byte) (string, error)

NormalizedJSON returns a JSON representation of an object that has been normalized to produce a consistent output for hashing.

NOTE: If this string is unmarshalled again, there is no guarantee that the final representation will be consistent with the string produced by this function due to differences in JSON implementations and information loss. e.g: 

JSON does not have a requirement to respect object key ordering.

func NullISO8601UTC 

func NullISO8601UTC(t null.Time) string

NullISO8601UTC returns formatted time if valid, empty string otherwise.

func ParseEthereumAddress 

func ParseEthereumAddress(addressString string) (common.Address, error)

ParseEthereumAddress returns addressString as a go-ethereum Address, or an error if it's invalid, e.g. if EIP 55 capitalization check fails

func RemoveContents 

func RemoveContents(dir string) error

RemoveContents removes everything in a directory but not the directory itself. https://stackoverflow.com/questions/33450980/how-to-remove-all-contents-of-a-directory-using-golang

func RemoveHexPrefix 

func RemoveHexPrefix(str string) string

RemoveHexPrefix removes the prefix (0x) of a given hex string.

func RemoveQuotes 

func RemoveQuotes(input []byte) []byte

RemoveQuotes removes the first and last character if they are both either " or ', otherwise it is a noop.

func Sha256 

func Sha256(in string) (string, error)

Sha256 returns a hexadecimal encoded string of a hashed input

func StringToHex 

func StringToHex(in string) string

StringToHex converts a standard string to a hex encoded string.

func StripBearer 

func StripBearer(authorizationStr string) string

StripBearer removes the 'Bearer: ' prefix from the HTTP Authorization header.

func ToFilterArg 

func ToFilterArg(q ethereum.FilterQuery) interface{}

ToFilterArg filters logs with the given FilterQuery https://github.com/ethereum/go-ethereum/blob/762f3a48a00da02fe58063cb6ce8dc2d08821f15/ethclient/ethclient.go#L363

func ToFilterQueryFor 

func ToFilterQueryFor(fromBlock *big.Int, addresses []common.Address) ethereum.FilterQuery

ToFilterQueryFor returns a struct that encapsulates desired arguments used to filter event logs.

func Uint64ToHex 

func Uint64ToHex(i uint64) string

Uint64ToHex converts the given uint64 value to a hex-value string.

func WithoutZeroAddresses 

func WithoutZeroAddresses(addresses []common.Address) []common.Address

WithoutZeroAddresses returns a list of addresses excluding the zero address.

Types

type AfterNower 

type AfterNower interface {
	After(d time.Duration) <-chan time.Time
	Now() time.Time
}

AfterNower is an interface that fulfills the `After()` and `Now()` methods.

type Afterer 

type Afterer interface {
	After(d time.Duration) <-chan time.Time
}

Afterer is an interface that fulfills the After method, following the behavior of time.After.

type BackoffSleeper 

type BackoffSleeper struct {
	backoff.Backoff
	// contains filtered or unexported fields
}

BackoffSleeper is a sleeper that backs off on subsequent attempts.

func NewBackoffSleeper 

func NewBackoffSleeper() *BackoffSleeper

NewBackoffSleeper returns a BackoffSleeper that is configured to sleep for 0 seconds initially, then backs off from 1 second minimum to 10 seconds maximum.

func (*BackoffSleeper) After 

func (bs *BackoffSleeper) After() time.Duration

After returns the duration for the next stop, and increments the backoff.

func (*BackoffSleeper) Duration 

func (bs *BackoffSleeper) Duration() time.Duration

Duration returns the current duration value.

func (*BackoffSleeper) Reset 

func (bs *BackoffSleeper) Reset()

Reset resets the backoff intervals.

func (*BackoffSleeper) Sleep 

func (bs *BackoffSleeper) Sleep()

Sleep waits for the given duration, incrementing the back off.

type Clock 

type Clock struct{}

Clock is a basic type for scheduling events in the application.

func (Clock) After 

func (Clock) After(d time.Duration) <-chan time.Time

After returns the current time if the given duration has elapsed.

func (Clock) Now 

func (Clock) Now() time.Time

Now returns the current time.

type ConstantSleeper 

type ConstantSleeper struct {
	// contains filtered or unexported fields
}

ConstantSleeper is to assist with reattempts with the same sleep duration.

func NewConstantSleeper 

func NewConstantSleeper(d time.Duration) ConstantSleeper

NewConstantSleeper returns a ConstantSleeper that is configured to sleep for a constant duration based on the input.

func (ConstantSleeper) After 

func (cs ConstantSleeper) After() time.Duration

After returns the duration.

func (ConstantSleeper) Duration 

func (cs ConstantSleeper) Duration() time.Duration

Duration returns the duration value.

func (ConstantSleeper) Reset 

func (cs ConstantSleeper) Reset()

Reset is a no op since sleep time is constant.

func (ConstantSleeper) Sleep 

func (cs ConstantSleeper) Sleep()

Sleep waits for the given duration before reattempting.

type Nower 

type Nower interface {
	Now() time.Time
}

Nower is an interface that fulfills the Now method, following the behavior of time.Now.

type Sleeper 

type Sleeper interface {
	Reset()
	Sleep()
	After() time.Duration
	Duration() time.Duration
}

Sleeper interface is used for tasks that need to be done on some interval, excluding Cron, like reconnecting.

Source Files

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