common

package
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 Go to latest Published: Oct 21, 2019 License: GPL-3.0 Imports: 22 Imported by: 0

Documentation

Overview

Package common contains various helper functions, commonly used data types and constants.

Source Files

Each source file provides functions and types as listed below

  • big.go : Defines common big integers often used such as Big1
  • bytes.go : Provides conversion functions between a byte slice and a string in Hex format
  • cache.go : Defines Cache interface and constants such as CacheType
  • debug.go : Provides a function to let an user know where to report a bug. It is being used by datasync/downloader
  • format.go : Provides a function to print a time.Duration in more readable format
  • path.go : Provides functions to check a file's existence and to get an absolute path
  • size.go : Provides StorageSize type and its stringer functions
  • types.go : Provides commonly used Hash and Address types and its methods
  • utils.go : Provides LoadJSON function to read a JSON file

Index

Constants

View Source 
const (
	HashLength      = 32
	AddressLength   = 20
	SignatureLength = 65
)

Variables

View Source 
var (
	Big1   = big.NewInt(1)
	Big2   = big.NewInt(2)
	Big3   = big.NewInt(3)
	Big0   = big.NewInt(0)
	Big32  = big.NewInt(32)
	Big100 = big.NewInt(100)
	Big256 = big.NewInt(256)
	Big257 = big.NewInt(257)
)

Common big integers often used

View Source 
var CacheScale int = 100 // Cache size = preset size * CacheScale / 100.
View Source 
var ScaleByCacheUsageLevel int = 100 // Scale according to cache usage level (%).
View Source 
var TotalPhysicalMemGB int = getPhysicalMemorySize() // Convert Byte to GByte
View Source 
var WriteThroughCaching = false

TODO-Klaytn-Storage WriteThroughCaching flag should be stored to proper place.

Functions

func AbsolutePath 

func AbsolutePath(datadir string, filename string) string

AbsolutePath returns datadir + filename, or filename if it is absolute.

func Bytes2Hex 

func Bytes2Hex(d []byte) string

Bytes2Hex returns the hexadecimal encoding of d.

func CopyBytes 

func CopyBytes(b []byte) (copiedBytes []byte)

CopyBytes returns an exact copy of the provided bytes.

func EmptyHash 

func EmptyHash(h Hash) bool

func FileExist 

func FileExist(filePath string) bool

FileExist checks if a file exists at filePath.

func FromHex 

func FromHex(s string) []byte

FromHex returns the bytes represented by the hexadecimal string s. s may be prefixed with "0x".

func GetScaleByCacheUsageLevel 

func GetScaleByCacheUsageLevel(cacheUsageLevelFlag string) (int, error)

GetScaleByCacheUsageLevel returns the scale according to cacheUsageLevel

func Hex2Bytes 

func Hex2Bytes(str string) []byte

Hex2Bytes returns the bytes represented by the hexadecimal string str.

func Hex2BytesFixed 

func Hex2BytesFixed(str string, flen int) []byte

Hex2BytesFixed returns bytes of a specified fixed length flen.

func IsHexAddress 

func IsHexAddress(s string) bool

IsHexAddress verifies whether a string can represent a valid hex-encoded Klaytn address or not.

func IsPrecompiledContractAddress 

func IsPrecompiledContractAddress(addr Address) bool

IsPrecompiledContractAddress returns true if the input address is in the range of precompiled contract addresses.

func LeftPadBytes 

func LeftPadBytes(slice []byte, l int) []byte

LeftPadBytes zero-pads slice to the left up to length l.

func LoadJSON 

func LoadJSON(file string, val interface{}) error

LoadJSON reads the given file and unmarshals its content.

func MakeName 

func MakeName(name, version string) string

MakeName creates a node name that follows the Klaytn convention for such names. It adds the operation system name and Go runtime version the name.

func PrintDepricationWarning 

func PrintDepricationWarning(str string)

PrintDepricationWarning prinst the given string in a box using fmt.Println.

func Report 

func Report(extra ...interface{})

Report gives off a warning requesting the user to submit an issue to the github tracker.

func RightPadBytes 

func RightPadBytes(slice []byte, l int) []byte

RightPadBytes zero-pads slice to the right up to length l.

func ToHex deprecated 

func ToHex(b []byte) string

ToHex returns the hex representation of b, prefixed with '0x'. For empty slices, the return value is "0x0".

Deprecated: use hexutil.Encode instead.

Types

type ARCConfig 

type ARCConfig struct {
	CacheSize int
}

type Address 

type Address [AddressLength]byte

Address represents the 20 byte address of a Klaytn account.

func BigToAddress 

func BigToAddress(b *big.Int) Address

BigToAddress returns Address with byte values of b. If b is larger than len(h), b will be cropped from the left.

func BytesToAddress 

func BytesToAddress(b []byte) Address

BytesToAddress returns Address with value b. If b is larger than len(h), b will be cropped from the left.

func HexToAddress 

func HexToAddress(s string) Address

HexToAddress returns Address with byte values of s. If s is larger than len(h), s will be cropped from the left.

func StringToAddress 

func StringToAddress(s string) Address

func (Address) Bytes 

func (a Address) Bytes() []byte

Bytes gets the string representation of the underlying address.

func (Address) Format 

func (a Address) Format(s fmt.State, c rune)

Format implements fmt.Formatter, forcing the byte slice to be formatted as is, without going through the stringer interface used for logging.

func (Address) Hash 

func (a Address) Hash() Hash

Hash converts an address to a hash by left-padding it with zeros.

func (Address) Hex 

func (a Address) Hex() string

Hex returns an EIP55-compliant hex string representation of the address.

func (Address) MarshalText 

func (a Address) MarshalText() ([]byte, error)

MarshalText returns the hex representation of a.

func (*Address) SetBytes 

func (a *Address) SetBytes(b []byte)

SetBytes sets the address to the value of b. If b is larger than len(a) it will panic.

func (*Address) SetBytesFromFront 

func (a *Address) SetBytesFromFront(b []byte)

SetBytesFromFront sets the address to the value of b. If len(b) is larger, take AddressLength bytes from front.

func (Address) String 

func (a Address) String() string

String implements fmt.Stringer.

func (*Address) UnmarshalJSON 

func (a *Address) UnmarshalJSON(input []byte) error

UnmarshalJSON parses a hash in hex syntax.

func (*Address) UnmarshalText 

func (a *Address) UnmarshalText(input []byte) error

UnmarshalText parses a hash in hex syntax.

type Cache 

type Cache interface {
	Add(key CacheKey, value interface{}) (evicted bool)
	Get(key CacheKey) (value interface{}, ok bool)
	Contains(key CacheKey) bool
	Purge()
}

func NewCache 

func NewCache(config CacheConfiger) Cache

type CacheConfiger 

type CacheConfiger interface {
	// contains filtered or unexported methods
}

type CacheKey 

type CacheKey interface {
	// contains filtered or unexported methods
}

type CacheKeyUint64 

type CacheKeyUint64 uint64

type CacheType 

type CacheType int
const (
	LRUCacheType CacheType = iota
	LRUShardCacheType
	FIFOCacheType
	ARCChacheType
)
var DefaultCacheType CacheType = FIFOCacheType

it's set by flag.

type FIFOCacheConfig 

type FIFOCacheConfig struct {
	CacheSize int
}

FIFOCacheConfig is a implementation of CacheConfiger interface for fifoCache.

type GovernanceCacheKey 

type GovernanceCacheKey string

type Hash 

type Hash [HashLength]byte

Hash represents the 32 byte Keccak256 hash of arbitrary data.

func BigToHash 

func BigToHash(b *big.Int) Hash

BigToHash sets byte representation of b to hash. If b is larger than len(h), b will be cropped from the left.

func BytesToHash 

func BytesToHash(b []byte) Hash

BytesToHash sets b to hash. If b is larger than len(h), b will be cropped from the left.

func HexToHash 

func HexToHash(s string) Hash

HexToHash sets byte representation of s to hash. If b is larger than len(h), b will be cropped from the left.

func (Hash) Big 

func (h Hash) Big() *big.Int

Big converts a hash to a big integer.

func (Hash) Bytes 

func (h Hash) Bytes() []byte

Bytes gets the byte representation of the underlying hash.

func (Hash) Format 

func (h Hash) Format(s fmt.State, c rune)

Format implements fmt.Formatter, forcing the byte slice to be formatted as is, without going through the stringer interface used for logging.

func (Hash) Generate 

func (h Hash) Generate(rand *rand.Rand, size int) reflect.Value

Generate implements testing/quick.Generator.

func (Hash) Hex 

func (h Hash) Hex() string

Hex converts a hash to a hex string.

func (Hash) MarshalText 

func (h Hash) MarshalText() ([]byte, error)

MarshalText returns the hex representation of h.

func (*Hash) SetBytes 

func (h *Hash) SetBytes(b []byte)

SetBytes sets the hash to the value of b. If b is larger than len(h), b will be cropped from the left.

func (Hash) String 

func (h Hash) String() string

String implements the stringer interface and is used also by the logger when doing full logging into a file.

func (Hash) TerminalString 

func (h Hash) TerminalString() string

TerminalString implements log.TerminalStringer, formatting a string for console output during logging.

func (*Hash) UnmarshalJSON 

func (h *Hash) UnmarshalJSON(input []byte) error

UnmarshalJSON parses a hash in hex syntax.

func (*Hash) UnmarshalText 

func (h *Hash) UnmarshalText(input []byte) error

UnmarshalText parses a hash in hex syntax.

type LRUConfig 

type LRUConfig struct {
	CacheSize int
}

type LRUShardConfig 

type LRUShardConfig struct {
	CacheSize int
	// Hash, and Address type can not generate as many shard indexes as the maximum (2 ^ 16 = 65536),
	// so it is meaningless to set the NumShards larger than this.
	NumShards int
}

type PrettyDuration 

type PrettyDuration time.Duration

PrettyDuration is a pretty printed version of a time.Duration value that cuts the unnecessary precision off from the formatted textual representation.

func (PrettyDuration) String 

func (d PrettyDuration) String() string

String implements the Stringer interface, allowing pretty printing of duration values rounded to three decimals.

type StorageSize 

type StorageSize float64

StorageSize is a wrapper around a float value that supports user friendly formatting.

func (StorageSize) String 

func (s StorageSize) String() string

String implements the stringer interface.

func (StorageSize) TerminalString 

func (s StorageSize) TerminalString() string

TerminalString implements log.TerminalStringer, formatting a string for console output during logging.

type UnprefixedAddress 

type UnprefixedAddress Address

UnprefixedAddress allows marshaling an Address without 0x prefix.

func (UnprefixedAddress) MarshalText 

func (a UnprefixedAddress) MarshalText() ([]byte, error)

MarshalText encodes the address as hex.

func (*UnprefixedAddress) UnmarshalText 

func (a *UnprefixedAddress) UnmarshalText(input []byte) error

UnmarshalText decodes the address from hex. The 0x prefix is optional.

type UnprefixedHash 

type UnprefixedHash Hash

UnprefixedHash allows marshaling a Hash without 0x prefix.

func (UnprefixedHash) MarshalText 

func (h UnprefixedHash) MarshalText() ([]byte, error)

MarshalText encodes the hash as hex.

func (*UnprefixedHash) UnmarshalText 

func (h *UnprefixedHash) UnmarshalText(input []byte) error

UnmarshalText decodes the hash from hex. The 0x prefix is optional.

Source Files

View all Source files

Directories

Path Synopsis
Package bitutil implements fast bitwise operations and compression/decompressions.
 Package bitutil implements fast bitwise operations and compression/decompressions.
Package compiler wraps the Solidity compiler executable (solc).
 Package compiler wraps the Solidity compiler executable (solc).
Package fdlimit handles file descriptors based on the operating system.
 Package fdlimit handles file descriptors based on the operating system.
Package hexutil implements hex encoding with 0x prefix.
 Package hexutil implements hex encoding with 0x prefix.
Package math provides convenience functions to use big.Int and to parse a string into an integer.
 Package math provides convenience functions to use big.Int and to parse a string into an integer.
Package mclock is a wrapper for a monotonic clock source.
 Package mclock is a wrapper for a monotonic clock source.
Package profile provides a profiler which can store a key and related TimeRecord.
 Package profile provides a profiler which can store a key and related TimeRecord.

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