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add resp3 protocol part 5(replace to resp3) #83
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,191 @@ | ||
| package protcl | ||
|
|
||
| import ( | ||
| "bufio" | ||
| "math/big" | ||
| "strconv" | ||
| "strings" | ||
| ) | ||
|
|
||
| // Resp3Parser is for parser resp3 protocol | ||
| type Resp3Parser struct { | ||
| reader *bufio.Reader | ||
| } | ||
|
|
||
| // NewResp3Parser return a Resp3Parser | ||
| func NewResp3Parser(r *bufio.Reader) *Resp3Parser { | ||
| return &Resp3Parser{reader: r} | ||
| } | ||
|
|
||
| // Commands parse resp3 message to kache command | ||
| func (r *Resp3Parser) Commands() (*RespCommand, error) { | ||
| resp3, err := r.Parse() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| args, err := resp3.commands() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| if len(args) == 0 { | ||
| return nil, &ErrInvalidCommand{} | ||
| } | ||
|
|
||
| return &RespCommand{Name: strings.ToLower(args[0]), Args: args[1:]}, nil | ||
| } | ||
|
|
||
| // Parse return Resp3 | ||
| func (r *Resp3Parser) Parse() (*Resp3, error) { | ||
| resp, err := r.parse() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return resp, nil | ||
| } | ||
|
|
||
| func (r *Resp3Parser) parse() (*Resp3, error) { | ||
| b, err := r.reader.ReadByte() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| switch b { | ||
| case Resp3SimpleString, Resp3SimpleError: | ||
| str, err := r.stringBeforeLF() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &Resp3{Type: b, Str: str}, nil | ||
| case Resp3BlobString, Resp3BolbError: | ||
| length, err := r.intBeforeLF() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| bs, err := r.readLengthBytesWithLF(length) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| return &Resp3{Type: b, Str: string(bs)}, nil | ||
| case Resp3Number: | ||
| integer, err := r.intBeforeLF() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &Resp3{Type: b, Integer: integer}, nil | ||
| case Resp3Double: | ||
| str, err := r.stringBeforeLF() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| f, err := strconv.ParseFloat(str, 64) | ||
| if err != nil { | ||
| return nil, &ErrConvertType{Type: "double", Value: str, Err: err} | ||
| } | ||
| return &Resp3{Type: b, Double: f}, nil | ||
| case Resp3BigNumber: | ||
| str, err := r.stringBeforeLF() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| bigInt, ok := big.NewInt(0).SetString(str, 10) | ||
| if !ok { | ||
| return nil, &ErrConvertType{Type: "Big Number", Value: str} | ||
| } | ||
| return &Resp3{Type: b, BigInt: bigInt}, nil | ||
| case Resp3Null: | ||
| if _, err := r.readLengthBytesWithLF(0); err != nil { | ||
| return nil, err | ||
| } | ||
| return &Resp3{Type: b}, nil | ||
| case Resp3Boolean: | ||
| buf, err := r.readLengthBytesWithLF(1) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| switch buf[0] { | ||
| case 't': | ||
| return &Resp3{Type: b, Boolean: true}, nil | ||
| case 'f': | ||
| return &Resp3{Type: b, Boolean: false}, nil | ||
| } | ||
| return nil, &ErrUnexpectString{Str: "t/f"} | ||
| case Resp3Array, Resp3Set: | ||
| length, err := r.intBeforeLF() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| resp := &Resp3{Type: b} | ||
| for i := 0; i < length; i++ { | ||
| elem, err := r.Parse() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| resp.Elems = append(resp.Elems, elem) | ||
| } | ||
| return resp, nil | ||
| } | ||
|
|
||
| return nil, &ErrProtocolType{Type: b} | ||
| } | ||
|
|
||
| func (r *Resp3Parser) stringBeforeLF() (string, error) { | ||
| buf, err := r.reader.ReadBytes(LF) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| bs, err := trimLastLF(buf) | ||
| if err != nil { | ||
| return "", err | ||
| } | ||
| return string(bs), nil | ||
| } | ||
|
|
||
| func (r *Resp3Parser) intBeforeLF() (int, error) { | ||
| buf, err := r.reader.ReadBytes(LF) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| bs, err := trimLastLF(buf) | ||
| if err != nil { | ||
| return 0, err | ||
| } | ||
| s := string(bs) | ||
| i, err := strconv.Atoi(s) | ||
| if err != nil { | ||
| return 0, &ErrCastFailedToInt{Val: s} | ||
| } | ||
| return i, nil | ||
| } | ||
|
|
||
| func (r *Resp3Parser) readLengthBytesWithLF(length int) ([]byte, error) { | ||
| if length == 0 { | ||
| if b, err := r.reader.ReadByte(); err != nil { | ||
| return nil, err | ||
| } else if b != LF { | ||
| return nil, &ErrUnexpectString{Str: "<LF>"} | ||
| } | ||
| return nil, nil | ||
| } | ||
|
|
||
| buf := make([]byte, length+1) | ||
| n, err := r.reader.Read(buf) | ||
| if err != nil { | ||
| return nil, err | ||
| } else if n < length+1 { | ||
| return nil, &ErrUnexpectedLineEnd{} | ||
| } | ||
|
|
||
| return trimLastLF(buf) | ||
| } | ||
|
|
||
| func trimLastLF(buf []byte) ([]byte, error) { | ||
| bufLen := len(buf) | ||
| if len(buf) == 0 || buf[bufLen-1] != LF { | ||
| return nil, &ErrUnexpectedLineEnd{} | ||
| } | ||
|
|
||
| return buf[:bufLen-1], nil | ||
| } |
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why not we add
Err errortoResp3to directly accept errorsThere was a problem hiding this comment.
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for now i will merge it we can replace it later