common

package
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Published: Jun 12, 2023 License: GPL-3.0, MIT Imports: 21 Imported by: 8

Documentation

Overview

Package common contains various helper functions.

Index

Constants

View Source
const (
	// HashLength is the expected length of the hash
	HashLength = 32
	// AddressLength is the expected length of the address
	AddressLength = 20
)

Lengths of hashes and addresses in bytes.

View Source
const (
	// MaxVarIntPayload is the maximum payload size for a variable length integer.
	MaxVarIntPayload = 9
)

Variables

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

Common big integers often used

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 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 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 Ethereum address or not.

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 ethereum 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 ReadVarBytes

func ReadVarBytes(r io.Reader, pver uint32, maxAllowed uint32,
	fieldName string) ([]byte, error)

ReadVarBytes reads a variable length byte array. A byte array is encoded as a varInt containing the length of the array followed by the bytes themselves. An error is returned if the length is greater than the passed maxAllowed parameter which helps protect against memory exhaustion attacks and forced panics through malformed messages. The fieldName parameter is only used for the error message so it provides more context in the error.

func ReadVarInt

func ReadVarInt(r io.Reader, pver uint32) (uint64, error)

ReadVarInt reads a variable length integer from r and returns it as a uint64.

func ReadVarString

func ReadVarString(r io.Reader, pver uint32) (string, error)

ReadVarString reads a variable length string from r and returns it as a Go string. A variable length string is encoded as a variable length integer containing the length of the string followed by the bytes that represent the string itself.

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.

func ToHexArray

func ToHexArray(b [][]byte) []string

ToHexArray creates a array of hex-string based on []byte

func TrimLeftZeroes

func TrimLeftZeroes(s []byte) []byte

TrimLeftZeroes returns a subslice of s without leading zeroes

func VarIntSerializeSize

func VarIntSerializeSize(val uint64) int

VarIntSerializeSize returns the number of bytes it would take to serialize val as a variable length integer.

func WriteVarBytes

func WriteVarBytes(w io.Writer, pver uint32, bytes []byte) error

WriteVarBytes serializes a variable length byte array to w as a varInt containing the number of bytes, followed by the bytes themselves.

func WriteVarInt

func WriteVarInt(w io.Writer, pver uint32, val uint64) error

WriteVarInt serializes val to w using a variable number of bytes depending on its value.

func WriteVarString

func WriteVarString(w io.Writer, pver uint32, str string) error

WriteVarString serializes str to w as a variable length integer containing the length of the string followed by the bytes that represent the string itself.

Types

type Address

type Address [AddressLength]byte

Address represents the 20 byte address of an Ethereum 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 (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) ImplementsGraphQLType

func (a Address) ImplementsGraphQLType(name string) bool

ImplementsGraphQLType returns true if Hash implements the specified GraphQL type.

func (Address) MarshalText

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

MarshalText returns the hex representation of a.

func (*Address) Scan

func (a *Address) Scan(src interface{}) error

Scan implements Scanner for database/sql.

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) String

func (a Address) String() string

String implements fmt.Stringer.

func (*Address) UnmarshalGraphQL

func (a *Address) UnmarshalGraphQL(input interface{}) error

UnmarshalGraphQL unmarshals the provided GraphQL query data.

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.

func (Address) Value

func (a Address) Value() (driver.Value, error)

Value implements valuer for database/sql.

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) ImplementsGraphQLType

func (Hash) ImplementsGraphQLType(name string) bool

ImplementsGraphQLType returns true if Hash implements the specified GraphQL type.

func (Hash) MarshalText

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

MarshalText returns the hex representation of h.

func (*Hash) Scan

func (h *Hash) Scan(src interface{}) error

Scan implements Scanner for database/sql.

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) UnmarshalGraphQL

func (h *Hash) UnmarshalGraphQL(input interface{}) error

UnmarshalGraphQL unmarshals the provided GraphQL query data.

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.

func (Hash) Value

func (h Hash) Value() (driver.Value, error)

Value implements valuer for database/sql.

type MessageError

type MessageError struct {
	Func        string // Function name
	Description string // Human readable description of the issue
}

MessageError describes an issue with a message. An example of some potential issues are messages from the wrong bitcoin network, invalid commands, mismatched checksums, and exceeding max payloads.

This provides a mechanism for the caller to type assert the error to differentiate between general io errors such as io.EOF and issues that resulted from malformed messages.

func (*MessageError) Error

func (e *MessageError) Error() string

Error satisfies the error interface and prints human-readable errors.

type MixedcaseAddress

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

MixedcaseAddress retains the original string, which may or may not be correctly checksummed

func NewMixedcaseAddress

func NewMixedcaseAddress(addr Address) MixedcaseAddress

NewMixedcaseAddress constructor (mainly for testing)

func NewMixedcaseAddressFromString

func NewMixedcaseAddressFromString(hexaddr string) (*MixedcaseAddress, error)

NewMixedcaseAddressFromString is mainly meant for unit-testing

func (*MixedcaseAddress) Address

func (ma *MixedcaseAddress) Address() Address

Address returns the address

func (*MixedcaseAddress) MarshalJSON

func (ma *MixedcaseAddress) MarshalJSON() ([]byte, error)

MarshalJSON marshals the original value

func (*MixedcaseAddress) Original

func (ma *MixedcaseAddress) Original() string

Original returns the mixed-case input string

func (*MixedcaseAddress) String

func (ma *MixedcaseAddress) String() string

String implements fmt.Stringer

func (*MixedcaseAddress) UnmarshalJSON

func (ma *MixedcaseAddress) UnmarshalJSON(input []byte) error

UnmarshalJSON parses MixedcaseAddress

func (*MixedcaseAddress) ValidChecksum

func (ma *MixedcaseAddress) ValidChecksum() bool

ValidChecksum returns true if the address has valid checksum

type PrettyAge

type PrettyAge time.Time

PrettyAge is a pretty printed version of a time.Duration value that rounds the values up to a single most significant unit, days/weeks/years included.

func (PrettyAge) String

func (t PrettyAge) String() string

String implements the Stringer interface, allowing pretty printing of duration values rounded to the most significant time unit.

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.

Directories

Path Synopsis
Package bitutil implements fast bitwise operations.
Package bitutil implements fast bitwise operations.
Package compiler wraps the Solidity and Vyper compiler executables (solc; vyper).
Package compiler wraps the Solidity and Vyper compiler executables (solc; vyper).
Package hexutil implements hex encoding with 0x prefix.
Package hexutil implements hex encoding with 0x prefix.
Package math provides integer math utilities.
Package math provides integer math utilities.
Package mclock is a wrapper for a monotonic clock source
Package mclock is a wrapper for a monotonic clock source
Package prque implements a priority queue data structure supporting arbitrary value types and int64 priorities.
Package prque implements a priority queue data structure supporting arbitrary value types and int64 priorities.

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