utils

package
v1.3.0-rc4 Latest Latest
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 Go to latest Published: Apr 7, 2022 License: MIT Imports: 38 Imported by: 28

Documentation

Overview

Package utils is used for common functions and tools used across the codebase.

Index

Constants

View Source 
const (
	// FormatBytes encodes the output as bytes
	FormatBytes = "bytes"
	// FormatPreformatted encodes the output, assumed to be hex, as bytes.
	FormatPreformatted = "preformatted"
	// 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 (
	KB = 1000
	MB = 1000 * KB
	GB = 1000 * MB
	TB = 1000 * GB
)

nolint

View Source 
const (
	// FastN is a shorter N parameter for testing
	FastN = 2
	// FastP is a shorter P parameter for testing
	FastP = 1
)
View Source 
const (
	// DefaultSecretSize is the entropy in bytes to generate a base64 string of 64 characters.
	DefaultSecretSize = 48
	// EVMWordByteLen the length of an EVM Word Byte
	EVMWordByteLen = 32
)

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 DefaultScryptParams = ScryptParams{N: keystore.StandardScryptN, P: keystore.StandardScryptP}

DefaultScryptParams is for use in production. It used geth's standard level of encryption and is relatively expensive to decode. Avoid using this in tests.

View Source 
var EmptyHash = common.Hash{}

EmptyHash is a hash of all zeroes, otherwise in Ethereum as 0x0000000000000000000000000000000000000000000000000000000000000000

View Source 
var FastScryptParams = ScryptParams{N: FastN, P: FastP}

FastScryptParams is for use in tests, where you don't want to wear out your CPU with expensive key derivations, do not use it in production, or your encrypted keys will be easy to brute-force!

View Source 
var ZeroAddress = common.Address{}

ZeroAddress is an address of all zeroes, otherwise in Ethereum as 0x0000000000000000000000000000000000000000

Functions

func AddHexPrefix 

func AddHexPrefix(str string) string

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

func BoxOutput added in v0.10.11 

func BoxOutput(errorMsgTemplate string, errorMsgValues ...interface{}) string

BoxOutput formats its arguments as fmt.Printf, and encloses them in a box of arrows pointing at their content, in order to better highlight it. See ExampleBoxOutput

func Bytes32FromString added in v0.10.9 

func Bytes32FromString(s string) [32]byte

Bytes32FromString returns a 32 byte array filled from the given string, which may be of any length.

func Bytes4FromString added in v0.10.9 

func Bytes4FromString(s string) [4]byte

Bytes4FromString returns a 4 byte array filled from the given string, which may be of any length.

func CheckPasswordHash 

func CheckPasswordHash(password, hash string) bool

CheckPasswordHash wraps around bcrypt.CompareHashAndPassword for a friendlier API.

func CheckUint256 added in v0.8.2 

func CheckUint256(n *big.Int) error

CheckUint256 returns an error if n is out of bounds for a uint256

func ConcatBytes 

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

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

func ContextFromChan added in v0.9.3 

func ContextFromChan(chStop <-chan struct{}) (context.Context, context.CancelFunc)

ContextFromChan creates a context that finishes when the provided channel receives or is closed. When channel closes, the ctx.Err() will always be context.Canceled NOTE: Spins up a goroutine that exits on cancellation. REMEMBER TO CALL CANCEL OTHERWISE IT CAN LEAD TO MEMORY LEAKS

func ContextFromChanWithDeadline added in v1.1.0 

func ContextFromChanWithDeadline(chStop <-chan struct{}, timeout time.Duration) (context.Context, context.CancelFunc)

ContextFromChanWithDeadline creates a context with a deadline that finishes when the provided channel receives or is closed. NOTE: Spins up a goroutine that exits on cancellation. REMEMBER TO CALL CANCEL OTHERWISE IT CAN LEAD TO MEMORY LEAKS

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 EVMBytesToUint64 added in v0.9.0 

func EVMBytesToUint64(buf []byte) uint64

EVMBytesToUint64 converts a bytebuffer to uint64

func EVMEncodeBytes 

func EVMEncodeBytes(input []byte) []byte

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 EVMTranscodeInt256 

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

EVMTranscodeInt256 converts a json input to an EVM int256

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 EVMWordUint128 added in v0.8.2 

func EVMWordUint128(val *big.Int) ([]byte, error)

EVMWordUint128 returns a uint128 as an EVM word byte array.

func EVMWordUint32 added in v1.0.0 

func EVMWordUint32(val uint32) []byte

EVMWordUint32 returns a uint32 as an EVM word byte array.

func EVMWordUint64 

func EVMWordUint64(val uint64) []byte

EVMWordUint64 returns a uint64 as an EVM word byte array.

func EnsureDirAndMaxPerms added in v0.8.5 

func EnsureDirAndMaxPerms(path string, perms os.FileMode) error

EnsureDirAndMaxPerms ensures that the given path exists, that it's a directory, and that it has permissions that are no more permissive than the given ones.

- If the path does not exist, it is created - If the path exists, but is not a directory, an error is returned - If the path exists, and is a directory, but has the wrong perms, it is chmod'ed

func EnsureFileMaxPerms added in v0.8.5 

func EnsureFileMaxPerms(file *os.File, perms os.FileMode) error

EnsureFileMaxPerms ensures that the given file has permissions that are no more permissive than the given ones.

func EnsureFilepathMaxPerms added in v0.8.5 

func EnsureFilepathMaxPerms(filepath string, perms os.FileMode) (err error)

EnsureFilepathMaxPerms ensures that the file at the given filepath has permissions that are no more permissive than the given ones.

func FileExists 

func FileExists(name string) bool

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

func FiniteTicker added in v1.1.0 

func FiniteTicker(period time.Duration, onTick func()) func()

FiniteTicker starts a goroutine to execute the given function periodically, until the returned function is called.

func FormatJSON 

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

FormatJSON applies indent to format a JSON response.

func GenericEncode added in v1.0.0 

func GenericEncode(types []string, values ...interface{}) ([]byte, error)

GenericEncode eth encodes values based on the provided types

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 HexToBig added in v0.10.8 

func HexToBig(s string) *big.Int

HexToBig parses the given hex string or panics if it is invalid.

func HexToUint256 added in v0.8.2 

func HexToUint256(s string) (*big.Int, error)

HexToUint256 returns the uint256 represented by s, or an error if it doesn't represent one.

func ISO8601UTC 

func ISO8601UTC(t time.Time) string

ISO8601UTC formats given time to ISO8601.

func IsEmpty added in v0.10.4 

func IsEmpty(bytes []byte) bool

IsEmpty returns true if bytes contains only zero values, or has len 0.

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 IsFileOwnedByChainlink(fileInfo os.FileInfo) (bool, error)

IsFileOwnedByChainlink attempts to read fileInfo to verify file owner

func IsHexBytes added in v1.1.0 

func IsHexBytes(arr []byte) bool

IsHexBytes returns true if the given bytes array is basically HEX encoded value.

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 MaxInt 

func MaxInt(first int, ints ...int) int

MaxInt finds the maximum value of a list of ints.

func MaxUint32 

func MaxUint32(first uint32, uints ...uint32) uint32

MaxUint32 finds the maximum value of a list of uint32s.

func MinUint added in v0.8.2 

func MinUint(first uint, vals ...uint) uint

MinUint finds the minimum value of a list of uints.

func MustHash 

func MustHash(in string) common.Hash

MustHash returns the keccak256 hash, or panics on failure.

func MustUnmarshalToMap added in v0.8.17 

func MustUnmarshalToMap(input string) map[string]interface{}

MustUnmarshalToMap performs UnmarshalToMap, panics upon failure

func NewBytes32ID 

func NewBytes32ID() string

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

func NewHash added in v0.10.11 

func NewHash() common.Hash

NewHash return random Keccak256

func NewRedialBackoff added in v1.3.0 

func NewRedialBackoff() backoff.Backoff

NewRedialBackoff is a standard backoff to use for redialling or reconnecting to unreachable network endpoints

func NewSecret added in v0.6.6 

func NewSecret(n int) string

NewSecret returns a new securely random sequence of n bytes of entropy. The result is a base64 encoded string.

Panics on failed attempts to read from system's PRNG.

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 PadByteToHash added in v0.10.11 

func PadByteToHash(b byte) common.Hash

PadByteToHash returns a hash with zeros padded on the left of the given byte.

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 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 RetryWithBackoff added in v0.8.3 

func RetryWithBackoff(ctx context.Context, fn func() (retry bool))

RetryWithBackoff retries the sleeper and backs off if not Done

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 ToDecimal added in v0.9.3 

func ToDecimal(input interface{}) (decimal.Decimal, error)

ToDecimal converts an input to a decimal

func TooPermissive added in v0.8.5 

func TooPermissive(fileMode, maxAllowedPerms os.FileMode) bool

TooPermissive checks if the file has more than the allowed permissions

func Uint256ToBytes added in v0.8.2 

func Uint256ToBytes(x *big.Int) (uint256 []byte, err error)

Uint256ToBytes is x represented as the bytes of a uint256

func Uint256ToBytes32 added in v0.10.8 

func Uint256ToBytes32(n *big.Int) []byte

Uint256ToBytes32 returns the bytes32 encoding of the big int provided

func UnmarshalToMap added in v0.8.17 

func UnmarshalToMap(input string) (map[string]interface{}, error)

UnmarshalToMap takes an input json string and returns a map[string]interface i.e. a raw object

func ValidateCronSchedule added in v0.10.10 

func ValidateCronSchedule(schedule string) error

ValidateCronSchedule returns an error if the given schedule is invalid.

func WaitGroupChan added in v0.8.3 

func WaitGroupChan(wg *sync.WaitGroup) <-chan struct{}

WaitGroupChan creates a channel that closes when the provided sync.WaitGroup is done.

func WithCloseChan added in v1.3.0 

func WithCloseChan(parentCtx context.Context, chStop <-chan struct{}) (ctx context.Context, cancel context.CancelFunc)

WithCloseChan wraps a context so that it is canceled if the passed in channel is closed. NOTE: Spins up a goroutine that exits on cancellation. REMEMBER TO CALL CANCEL OTHERWISE IT CAN LEAD TO MEMORY LEAKS

func WithJitter added in v0.9.6 

func WithJitter(d time.Duration) time.Duration

WithJitter adds +/- 10% to a duration

func WrapIfError added in v0.8.13 

func WrapIfError(err *error, msg string)

WrapIfError decorates an error with the given message. It is intended to be used with `defer` statements, like so: 

func SomeFunction() (err error) {
    defer WrapIfError(&err, "error in SomeFunction:")

    ...
}

func WriteFileWithMaxPerms added in v0.8.5 

func WriteFileWithMaxPerms(path string, data []byte, perms os.FileMode) (err error)

WriteFileWithMaxPerms writes `data` to `path` and ensures that the file has permissions that are no more permissive than the given ones.

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 BackoffTicker added in v0.10.5 

type BackoffTicker struct {
	C chan time.Time

	sync.Mutex
	// contains filtered or unexported fields
}

BackoffTicker sends ticks with periods that increase over time, over a configured range.

func NewBackoffTicker added in v0.10.5 

func NewBackoffTicker(min, max time.Duration) BackoffTicker

NewBackoffTicker returns a new BackoffTicker for the given range.

func (*BackoffTicker) Bounds added in v0.10.8 

func (t *BackoffTicker) Bounds() (time.Duration, time.Duration)

func (*BackoffTicker) Start added in v0.10.5 

func (t *BackoffTicker) Start() bool

Start - Starts the ticker Returns true if the ticker was not running yet

func (*BackoffTicker) Stop added in v0.10.5 

func (t *BackoffTicker) Stop() bool

Stop stops the ticker. A ticker can be restarted by calling Start on a stopped ticker. Returns true if the ticker was actually stopped at this invocation (was previously running)

func (*BackoffTicker) Ticks added in v0.10.5 

func (t *BackoffTicker) Ticks() <-chan time.Time

Ticks returns the underlying channel.

type Big added in v0.8.2 

type Big big.Int

Big stores large integers and can deserialize a variety of inputs.

func NewBig added in v0.8.2 

func NewBig(i *big.Int) *Big

NewBig constructs a Big from *big.Int.

func NewBigI added in v0.8.7 

func NewBigI(i int64) *Big

NewBigI constructs a Big from int64.

func (*Big) Cmp added in v1.1.0 

func (b *Big) Cmp(c *Big) int

Cmp compares b and c as big.Ints.

func (*Big) Equal added in v1.1.0 

func (b *Big) Equal(c *Big) bool

Equal returns true if c is equal according to Cmp.

func (*Big) Hex added in v0.8.2 

func (b *Big) Hex() string

Hex returns the hex encoding of b.

func (Big) MarshalJSON added in v0.8.2 

func (b Big) MarshalJSON() ([]byte, error)

MarshalJSON marshals this instance to base 10 number as string.

func (Big) MarshalText added in v0.8.2 

func (b Big) MarshalText() ([]byte, error)

MarshalText marshals this instance to base 10 number as string.

func (*Big) Scan added in v0.8.2 

func (b *Big) Scan(value interface{}) error

Scan reads the database value and returns an instance.

func (*Big) String added in v0.8.2 

func (b *Big) String() string

String returns the base 10 encoding of b.

func (*Big) ToInt added in v0.8.2 

func (b *Big) ToInt() *big.Int

ToInt converts b to a big.Int.

func (*Big) UnmarshalJSON added in v0.8.2 

func (b *Big) UnmarshalJSON(input []byte) error

UnmarshalJSON implements encoding.JSONUnmarshaler.

func (*Big) UnmarshalText added in v0.8.2 

func (b *Big) UnmarshalText(input []byte) error

UnmarshalText implements encoding.TextUnmarshaler.

func (Big) Value added in v0.8.2 

func (b Big) Value() (driver.Value, error)

Value returns this instance serialized for database storage.

type BigFloat added in v0.8.2 

type BigFloat big.Float

BigFloat accepts both string and float JSON values.

func (BigFloat) MarshalJSON added in v0.8.2 

func (b BigFloat) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface.

func (*BigFloat) UnmarshalJSON added in v0.8.2 

func (b *BigFloat) UnmarshalJSON(buf []byte) error

UnmarshalJSON implements the json.Unmarshal interface.

func (*BigFloat) Value added in v0.8.2 

func (b *BigFloat) Value() *big.Float

Value returns the big.Float value.

type BoundedPriorityQueue added in v0.8.3 

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

BoundedPriorityQueue stores a series of BoundedQueues with associated priorities and capacities

func NewBoundedPriorityQueue added in v0.8.3 

func NewBoundedPriorityQueue(capacities map[uint]uint) *BoundedPriorityQueue

NewBoundedPriorityQueue creates a new BoundedPriorityQueue

func (*BoundedPriorityQueue) Add added in v0.8.3 

func (q *BoundedPriorityQueue) Add(priority uint, x interface{})

Add pushes an item into a subque within a BoundedPriorityQueue

func (*BoundedPriorityQueue) Empty added in v0.8.3 

func (q *BoundedPriorityQueue) Empty() bool

Empty checks the BoundedPriorityQueue if all subqueues are empty

func (*BoundedPriorityQueue) Take added in v0.8.3 

func (q *BoundedPriorityQueue) Take() interface{}

Take takes from the BoundedPriorityQueue's subque

type BoundedQueue added in v0.8.3 

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

BoundedQueue is a FIFO queue that discards older items when it reaches its capacity.

func NewBoundedQueue added in v0.8.3 

func NewBoundedQueue(capacity uint) *BoundedQueue

NewBoundedQueue creates a new BoundedQueue instance

func (*BoundedQueue) Add added in v0.8.3 

func (q *BoundedQueue) Add(x interface{})

Add appends items to a BoundedQueue

func (*BoundedQueue) Empty added in v0.8.3 

func (q *BoundedQueue) Empty() bool

Empty check is a BoundedQueue is empty

func (*BoundedQueue) Full added in v0.8.3 

func (q *BoundedQueue) Full() bool

Full checks if a BoundedQueue is over capacity.

func (*BoundedQueue) Take added in v0.8.3 

func (q *BoundedQueue) Take() interface{}

Take pulls the first item from the array and removes it

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 CronTicker added in v0.10.10 

type CronTicker struct {
	*cron.Cron
	// contains filtered or unexported fields
}

CronTicker is like a time.Ticker but for a cron schedule.

func NewCronTicker added in v0.10.10 

func NewCronTicker(schedule string) (CronTicker, error)

NewCronTicker returns a new CrontTicker for the given schedule.

func (*CronTicker) Start added in v0.10.10 

func (t *CronTicker) Start() bool

Start - returns true if the CronTicker was actually started, false otherwise

func (*CronTicker) Stop added in v0.10.10 

func (t *CronTicker) Stop() bool

Stop - returns true if the CronTicker was actually stopped, false otherwise

func (*CronTicker) Ticks added in v0.10.10 

func (t *CronTicker) Ticks() <-chan time.Time

Ticks returns the underlying chanel.

type DependentAwaiter added in v0.8.3 

type DependentAwaiter interface {
	AwaitDependents() <-chan struct{}
	AddDependents(n int)
	DependentReady()
}

DependentAwaiter contains Dependent funcs

func NewDependentAwaiter added in v0.8.3 

func NewDependentAwaiter() DependentAwaiter

NewDependentAwaiter creates a new DependentAwaiter

type DiskStatsProvider added in v1.3.0 

type DiskStatsProvider interface {
	AvailableSpace(path string) (FileSize, error)
}

DiskStatsProvider describes the abstraction to the `shirou/gopsutil/v3` for mocking purposes

func NewDiskStatsProvider added in v1.3.0 

func NewDiskStatsProvider() DiskStatsProvider

NewDiskStatsProvider returns a new `DiskStatsProvider` instance

type FileSize added in v1.1.0 

type FileSize uint64

FileSize repesents a file size in bytes.

func (FileSize) MarshalText added in v1.1.0 

func (s FileSize) MarshalText() ([]byte, error)

MarshalText encodes s as a human readable string.

func (FileSize) String added in v1.1.0 

func (s FileSize) String() string

func (*FileSize) UnmarshalText added in v1.1.0 

func (s *FileSize) UnmarshalText(bs []byte) error

UnmarshalText parses a file size from bs in to s.

type KeyedMutex added in v0.10.9 

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

KeyedMutex allows to lock based on particular values

func (*KeyedMutex) LockInt64 added in v0.10.9 

func (m *KeyedMutex) LockInt64(key int64) func()

LockInt64 locks the value for read/write

type Mailbox added in v0.10.0 

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

Mailbox contains a notify channel, a mutual exclusive lock, a queue of interfaces, and a queue capacity.

func NewHighCapacityMailbox added in v1.0.0 

func NewHighCapacityMailbox() *Mailbox

NewHighCapacityMailbox create a new mailbox with a capacity that is better able to handle e.g. large log replays

func NewMailbox added in v0.10.0 

func NewMailbox(capacity uint64) *Mailbox

NewMailbox creates a new mailbox instance

func (*Mailbox) Deliver added in v0.10.0 

func (m *Mailbox) Deliver(x interface{}) (wasOverCapacity bool)

Deliver appends an interface to the queue

func (*Mailbox) Notify added in v0.10.0 

func (m *Mailbox) Notify() chan struct{}

Notify returns the contents of the notify channel

func (*Mailbox) Retrieve added in v0.10.0 

func (m *Mailbox) Retrieve() (interface{}, bool)

Retrieve fetches an interface from the queue

func (*Mailbox) RetrieveLatestAndClear added in v0.10.3 

func (m *Mailbox) RetrieveLatestAndClear() interface{}

RetrieveLatestAndClear returns the latest value (or nil), and clears the queue.

type Nower 

type Nower interface {
	Now() time.Time
}

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

type PausableTicker added in v0.9.0 

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

PausableTicker stores a ticker with a duration

func NewPausableTicker added in v0.9.0 

func NewPausableTicker(duration time.Duration) PausableTicker

NewPausableTicker creates a new PausableTicker

func (*PausableTicker) Destroy added in v0.9.0 

func (t *PausableTicker) Destroy()

Destroy pauses the PausibleTicker

func (*PausableTicker) Pause added in v0.9.0 

func (t *PausableTicker) Pause()

Pause pauses a PausableTicker

func (*PausableTicker) Resume added in v0.9.0 

func (t *PausableTicker) Resume()

Resume resumes a Ticker using a PausibleTicker's duration

func (*PausableTicker) Ticks added in v0.9.0 

func (t *PausableTicker) Ticks() <-chan time.Time

Ticks retrieves the ticks from a PausableTicker

type ResettableTimer added in v0.9.0 

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

ResettableTimer stores a timer

func NewResettableTimer added in v0.9.0 

func NewResettableTimer() ResettableTimer

NewResettableTimer creates a new ResettableTimer

func (*ResettableTimer) Reset added in v0.9.0 

func (t *ResettableTimer) Reset(duration time.Duration)

Reset stops a ResettableTimer and resets it with a new duration

func (*ResettableTimer) Stop added in v0.9.0 

func (t *ResettableTimer) Stop()

Stop stops a ResettableTimer

func (*ResettableTimer) Ticks added in v0.9.0 

func (t *ResettableTimer) Ticks() <-chan time.Time

Ticks retrieves the ticks from a ResettableTimer

type ScryptConfigReader added in v0.9.3 

type ScryptConfigReader interface {
	InsecureFastScrypt() bool
}

ScryptConfigReader can check for an insecure, fast flag

type ScryptParams added in v0.9.3 

type ScryptParams struct{ N, P int }

ScryptParams represents two integers, N and P.

func GetScryptParams added in v0.9.3 

func GetScryptParams(config ScryptConfigReader) ScryptParams

GetScryptParams fetches ScryptParams from a ScryptConfigReader

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.

type SleeperTask added in v0.9.3 

type SleeperTask interface {
	Stop() error
	WakeUp()
	WakeUpIfStarted()
}

SleeperTask represents a task that waits in the background to process some work.

func NewSleeperTask added in v0.9.3 

func NewSleeperTask(worker Worker) SleeperTask

NewSleeperTask takes a worker and returns a SleeperTask.

SleeperTask is guaranteed to call Work on the worker at least once for every WakeUp call. If the Worker is busy when WakeUp is called, the Worker will be called again immediately after it is finished. For this reason you should take care to make sure that Worker is idempotent. WakeUp does not block.

type StartStopOnce added in v0.9.3 

type StartStopOnce struct {
	sync.RWMutex // lock is held during startup/shutdown, RLock is held while executing functions dependent on a particular state
	// contains filtered or unexported fields
}

StartStopOnce contains a StartStopOnceState integer

func (*StartStopOnce) Healthy added in v0.10.8 

func (once *StartStopOnce) Healthy() error

Healthy returns ErrNotStarted if the state is not started. Override this per-service with more specific implementations.

func (*StartStopOnce) IfNotStopped added in v1.2.0 

func (once *StartStopOnce) IfNotStopped(f func()) (ok bool)

IfNotStopped runs the func and returns true if in any state other than Stopped

func (*StartStopOnce) IfStarted added in v0.10.5 

func (once *StartStopOnce) IfStarted(f func()) (ok bool)

IfStarted runs the func and returns true only if started, otherwise returns false

func (*StartStopOnce) Ready added in v0.10.8 

func (once *StartStopOnce) Ready() error

Ready returns ErrNotStarted if the state is not started.

func (*StartStopOnce) StartOnce added in v0.9.3 

func (once *StartStopOnce) StartOnce(name string, fn func() error) error

StartOnce sets the state to Started

func (*StartStopOnce) State added in v0.9.3 

func (once *StartStopOnce) State() StartStopOnceState

State retrieves the current state

func (*StartStopOnce) StopOnce added in v0.9.3 

func (once *StartStopOnce) StopOnce(name string, fn func() error) error

StopOnce sets the state to Stopped

type StartStopOnceState added in v0.9.3 

type StartStopOnceState int32

StartStopOnceState holds the state for StartStopOnce 

const (
	StartStopOnce_Unstarted StartStopOnceState = iota
	StartStopOnce_Started
	StartStopOnce_Starting
	StartStopOnce_Stopping
	StartStopOnce_Stopped
)

nolint

func (StartStopOnceState) String added in v1.3.0 

func (s StartStopOnceState) String() string

type TickerBase added in v0.10.14 

type TickerBase interface {
	Resume()
	Pause()
	Destroy()
	Ticks() <-chan time.Time
}

TickerBase is an interface for pausable tickers.

type Worker added in v0.9.3 

type Worker interface {
	Work()
	Name() string
}

Worker is a simple interface that represents some work to do repeatedly

func SleeperFuncTask added in v1.1.0 

func SleeperFuncTask(work func(), name string) Worker

SleeperFuncTask returns a Worker to execute the given work function.

Source Files

View all Source files

Directories

Path Synopsis
Package bigmath compensates for awkward big.Int API.
 Package bigmath compensates for awkward big.Int API.

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