common: improve printing of Hash and Address (#21834)
Both Hash and Address have a String method, which returns the value as
hex with 0x prefix. They also had a Format method which tried to print
the value using printf of []byte. The way Format worked was at odds with
String though, leading to a situation where fmt.Sprintf("%v", hash)
returned the decimal notation and hash.String() returned a hex string.
This commit makes it consistent again. Both types now support the %v,
%s, %q format verbs for 0x-prefixed hex output. %x, %X creates
unprefixed hex output. %d is also supported and returns the decimal
notation "[1 2 3...]".
For Address, the case of hex characters in %v, %s, %q output is
determined using the EIP-55 checksum. Using %x, %X with Address
disables checksumming.
Co-authored-by: Felix Lange <fjl@twurst.com>
This commit is contained in:
Li, Cheng
GitHub
parent
ed0670cb17
commit
bd848aad7c
106
common/types.go
106
common/types.go
@ -17,6 +17,7 @@
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package common
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import (
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"bytes"
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"database/sql/driver"
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"encoding/hex"
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"encoding/json"
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@ -84,10 +85,34 @@ func (h Hash) String() string {
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return h.Hex()
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}
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// Format implements fmt.Formatter, forcing the byte slice to be formatted as is,
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// without going through the stringer interface used for logging.
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// Format implements fmt.Formatter.
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// Hash supports the %v, %s, %v, %x, %X and %d format verbs.
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func (h Hash) Format(s fmt.State, c rune) {
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fmt.Fprintf(s, "%"+string(c), h[:])
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hexb := make([]byte, 2+len(h)*2)
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copy(hexb, "0x")
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hex.Encode(hexb[2:], h[:])
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switch c {
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case 'x', 'X':
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if !s.Flag('#') {
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hexb = hexb[2:]
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}
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if c == 'X' {
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hexb = bytes.ToUpper(hexb)
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}
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fallthrough
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case 'v', 's':
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s.Write(hexb)
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case 'q':
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q := []byte{'"'}
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s.Write(q)
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s.Write(hexb)
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s.Write(q)
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case 'd':
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fmt.Fprint(s, ([len(h)]byte)(h))
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default:
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fmt.Fprintf(s, "%%!%c(hash=%x)", c, h)
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}
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}
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// UnmarshalText parses a hash in hex syntax.
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@ -208,24 +233,7 @@ func (a Address) Hash() Hash { return BytesToHash(a[:]) }
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// Hex returns an EIP55-compliant hex string representation of the address.
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func (a Address) Hex() string {
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unchecksummed := hex.EncodeToString(a[:])
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sha := sha3.NewLegacyKeccak256()
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sha.Write([]byte(unchecksummed))
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hash := sha.Sum(nil)
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result := []byte(unchecksummed)
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for i := 0; i < len(result); i++ {
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hashByte := hash[i/2]
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if i%2 == 0 {
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hashByte = hashByte >> 4
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} else {
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hashByte &= 0xf
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}
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if result[i] > '9' && hashByte > 7 {
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result[i] -= 32
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}
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}
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return "0x" + string(result)
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return string(a.checksumHex())
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}
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// String implements fmt.Stringer.
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@ -233,10 +241,60 @@ func (a Address) String() string {
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return a.Hex()
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}
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// Format implements fmt.Formatter, forcing the byte slice to be formatted as is,
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// without going through the stringer interface used for logging.
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func (a *Address) checksumHex() []byte {
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buf := a.hex()
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// compute checksum
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sha := sha3.NewLegacyKeccak256()
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sha.Write(buf[2:])
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hash := sha.Sum(nil)
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for i := 2; i < len(buf); i++ {
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hashByte := hash[(i-2)/2]
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if i%2 == 0 {
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hashByte = hashByte >> 4
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} else {
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hashByte &= 0xf
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}
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if buf[i] > '9' && hashByte > 7 {
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buf[i] -= 32
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}
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}
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return buf[:]
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}
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func (a Address) hex() []byte {
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var buf [len(a)*2 + 2]byte
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copy(buf[:2], "0x")
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hex.Encode(buf[2:], a[:])
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return buf[:]
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}
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// Format implements fmt.Formatter.
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// Address supports the %v, %s, %v, %x, %X and %d format verbs.
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func (a Address) Format(s fmt.State, c rune) {
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fmt.Fprintf(s, "%"+string(c), a[:])
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switch c {
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case 'v', 's':
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s.Write(a.checksumHex())
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case 'q':
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q := []byte{'"'}
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s.Write(q)
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s.Write(a.checksumHex())
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s.Write(q)
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case 'x', 'X':
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// %x disables the checksum.
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hex := a.hex()
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if !s.Flag('#') {
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hex = hex[2:]
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}
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if c == 'X' {
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hex = bytes.ToUpper(hex)
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}
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s.Write(hex)
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case 'd':
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fmt.Fprint(s, ([len(a)]byte)(a))
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default:
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fmt.Fprintf(s, "%%!%c(address=%x)", c, a)
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}
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}
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// SetBytes sets the address to the value of b.
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@ -17,8 +17,10 @@
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package common
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import (
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"bytes"
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"database/sql/driver"
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"encoding/json"
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"fmt"
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"math/big"
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"reflect"
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"strings"
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@ -371,3 +373,167 @@ func TestAddress_Value(t *testing.T) {
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})
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}
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}
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func TestAddress_Format(t *testing.T) {
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b := []byte{
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0xb2, 0x6f, 0x2b, 0x34, 0x2a, 0xab, 0x24, 0xbc, 0xf6, 0x3e,
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0xa2, 0x18, 0xc6, 0xa9, 0x27, 0x4d, 0x30, 0xab, 0x9a, 0x15,
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}
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var addr Address
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addr.SetBytes(b)
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tests := []struct {
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name string
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out string
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want string
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}{
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{
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name: "println",
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out: fmt.Sprintln(addr),
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want: "0xB26f2b342AAb24BCF63ea218c6A9274D30Ab9A15\n",
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},
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{
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name: "print",
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out: fmt.Sprint(addr),
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want: "0xB26f2b342AAb24BCF63ea218c6A9274D30Ab9A15",
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},
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{
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name: "printf-s",
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out: func() string {
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buf := new(bytes.Buffer)
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fmt.Fprintf(buf, "%s", addr)
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return buf.String()
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}(),
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want: "0xB26f2b342AAb24BCF63ea218c6A9274D30Ab9A15",
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},
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{
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name: "printf-q",
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out: fmt.Sprintf("%q", addr),
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want: `"0xB26f2b342AAb24BCF63ea218c6A9274D30Ab9A15"`,
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},
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{
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name: "printf-x",
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out: fmt.Sprintf("%x", addr),
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want: "b26f2b342aab24bcf63ea218c6a9274d30ab9a15",
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},
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{
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name: "printf-X",
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out: fmt.Sprintf("%X", addr),
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want: "B26F2B342AAB24BCF63EA218C6A9274D30AB9A15",
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},
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{
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name: "printf-#x",
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out: fmt.Sprintf("%#x", addr),
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want: "0xb26f2b342aab24bcf63ea218c6a9274d30ab9a15",
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},
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{
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name: "printf-v",
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out: fmt.Sprintf("%v", addr),
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want: "0xB26f2b342AAb24BCF63ea218c6A9274D30Ab9A15",
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},
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// The original default formatter for byte slice
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{
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name: "printf-d",
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out: fmt.Sprintf("%d", addr),
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want: "[178 111 43 52 42 171 36 188 246 62 162 24 198 169 39 77 48 171 154 21]",
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},
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// Invalid format char.
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{
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name: "printf-t",
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out: fmt.Sprintf("%t", addr),
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want: "%!t(address=b26f2b342aab24bcf63ea218c6a9274d30ab9a15)",
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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if tt.out != tt.want {
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t.Errorf("%s does not render as expected:\n got %s\nwant %s", tt.name, tt.out, tt.want)
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}
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})
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}
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}
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func TestHash_Format(t *testing.T) {
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var hash Hash
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hash.SetBytes([]byte{
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0xb2, 0x6f, 0x2b, 0x34, 0x2a, 0xab, 0x24, 0xbc, 0xf6, 0x3e,
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0xa2, 0x18, 0xc6, 0xa9, 0x27, 0x4d, 0x30, 0xab, 0x9a, 0x15,
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0xa2, 0x18, 0xc6, 0xa9, 0x27, 0x4d, 0x30, 0xab, 0x9a, 0x15,
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0x10, 0x00,
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})
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tests := []struct {
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name string
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out string
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want string
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}{
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{
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name: "println",
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out: fmt.Sprintln(hash),
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want: "0xb26f2b342aab24bcf63ea218c6a9274d30ab9a15a218c6a9274d30ab9a151000\n",
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},
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{
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name: "print",
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out: fmt.Sprint(hash),
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want: "0xb26f2b342aab24bcf63ea218c6a9274d30ab9a15a218c6a9274d30ab9a151000",
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},
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{
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name: "printf-s",
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out: func() string {
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buf := new(bytes.Buffer)
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fmt.Fprintf(buf, "%s", hash)
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return buf.String()
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}(),
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want: "0xb26f2b342aab24bcf63ea218c6a9274d30ab9a15a218c6a9274d30ab9a151000",
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},
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{
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name: "printf-q",
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out: fmt.Sprintf("%q", hash),
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want: `"0xb26f2b342aab24bcf63ea218c6a9274d30ab9a15a218c6a9274d30ab9a151000"`,
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},
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{
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name: "printf-x",
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out: fmt.Sprintf("%x", hash),
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want: "b26f2b342aab24bcf63ea218c6a9274d30ab9a15a218c6a9274d30ab9a151000",
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},
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{
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name: "printf-X",
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out: fmt.Sprintf("%X", hash),
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want: "B26F2B342AAB24BCF63EA218C6A9274D30AB9A15A218C6A9274D30AB9A151000",
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},
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{
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name: "printf-#x",
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out: fmt.Sprintf("%#x", hash),
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want: "0xb26f2b342aab24bcf63ea218c6a9274d30ab9a15a218c6a9274d30ab9a151000",
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},
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{
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name: "printf-#X",
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out: fmt.Sprintf("%#X", hash),
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want: "0XB26F2B342AAB24BCF63EA218C6A9274D30AB9A15A218C6A9274D30AB9A151000",
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},
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{
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name: "printf-v",
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out: fmt.Sprintf("%v", hash),
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want: "0xb26f2b342aab24bcf63ea218c6a9274d30ab9a15a218c6a9274d30ab9a151000",
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},
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// The original default formatter for byte slice
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{
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name: "printf-d",
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out: fmt.Sprintf("%d", hash),
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want: "[178 111 43 52 42 171 36 188 246 62 162 24 198 169 39 77 48 171 154 21 162 24 198 169 39 77 48 171 154 21 16 0]",
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},
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// Invalid format char.
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{
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name: "printf-t",
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out: fmt.Sprintf("%t", hash),
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want: "%!t(hash=b26f2b342aab24bcf63ea218c6a9274d30ab9a15a218c6a9274d30ab9a151000)",
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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if tt.out != tt.want {
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t.Errorf("%s does not render as expected:\n got %s\nwant %s", tt.name, tt.out, tt.want)
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}
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})
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}
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}
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