package proto import ( "bufio" "encoding" "fmt" "io" "strconv" "github.com/go-redis/redis/internal/util" ) type Writer struct { wr *bufio.Writer lenBuf []byte numBuf []byte } func NewWriter(wr io.Writer) *Writer { return &Writer{ wr: bufio.NewWriter(wr), lenBuf: make([]byte, 64), numBuf: make([]byte, 64), } } func (w *Writer) WriteArgs(args []interface{}) error { err := w.wr.WriteByte(ArrayReply) if err != nil { return err } err = w.writeLen(len(args)) if err != nil { return err } for _, arg := range args { err := w.writeArg(arg) if err != nil { return err } } return nil } func (w *Writer) writeLen(n int) error { w.lenBuf = strconv.AppendUint(w.lenBuf[:0], uint64(n), 10) w.lenBuf = append(w.lenBuf, '\r', '\n') _, err := w.wr.Write(w.lenBuf) return err } func (w *Writer) writeArg(v interface{}) error { switch v := v.(type) { case nil: return w.string("") case string: return w.string(v) case []byte: return w.bytes(v) case int: return w.int(int64(v)) case int8: return w.int(int64(v)) case int16: return w.int(int64(v)) case int32: return w.int(int64(v)) case int64: return w.int(v) case uint: return w.uint(uint64(v)) case uint8: return w.uint(uint64(v)) case uint16: return w.uint(uint64(v)) case uint32: return w.uint(uint64(v)) case uint64: return w.uint(v) case float32: return w.float(float64(v)) case float64: return w.float(v) case bool: if v { return w.int(1) } else { return w.int(0) } case encoding.BinaryMarshaler: b, err := v.MarshalBinary() if err != nil { return err } return w.bytes(b) default: return fmt.Errorf( "redis: can't marshal %T (implement encoding.BinaryMarshaler)", v) } } func (w *Writer) bytes(b []byte) error { err := w.wr.WriteByte(StringReply) if err != nil { return err } err = w.writeLen(len(b)) if err != nil { return err } _, err = w.wr.Write(b) if err != nil { return err } return w.crlf() } func (w *Writer) string(s string) error { return w.bytes(util.StringToBytes(s)) } func (w *Writer) uint(n uint64) error { w.numBuf = strconv.AppendUint(w.numBuf[:0], n, 10) return w.bytes(w.numBuf) } func (w *Writer) int(n int64) error { w.numBuf = strconv.AppendInt(w.numBuf[:0], n, 10) return w.bytes(w.numBuf) } func (w *Writer) float(f float64) error { w.numBuf = strconv.AppendFloat(w.numBuf[:0], f, 'f', -1, 64) return w.bytes(w.numBuf) } func (w *Writer) crlf() error { err := w.wr.WriteByte('\r') if err != nil { return err } return w.wr.WriteByte('\n') } func (w *Writer) Reset(wr io.Writer) { w.wr.Reset(wr) } func (w *Writer) Flush() error { return w.wr.Flush() }