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package proto
import (
"encoding"
"fmt"
"strconv"
)
type WriteBuffer struct {
b []byte
}
func NewWriteBuffer() *WriteBuffer {
return &WriteBuffer{
b: make([]byte, 0, 4096),
}
}
func (w *WriteBuffer) Len() int { return len(w.b) }
func (w *WriteBuffer) Bytes() []byte { return w.b }
func (w *WriteBuffer) Reset() { w.b = w.b[:0] }
func (w *WriteBuffer) Append(args []interface{}) error {
w.b = append(w.b, ArrayReply)
w.b = strconv.AppendUint(w.b, uint64(len(args)), 10)
w.b = append(w.b, '\r', '\n')
for _, arg := range args {
if err := w.append(arg); err != nil {
return err
}
}
return nil
}
func (w *WriteBuffer) append(val interface{}) error {
switch v := val.(type) {
case nil:
w.AppendString("")
case string:
w.AppendString(v)
case []byte:
w.AppendBytes(v)
case int:
w.AppendString(formatInt(int64(v)))
case int8:
w.AppendString(formatInt(int64(v)))
case int16:
w.AppendString(formatInt(int64(v)))
case int32:
w.AppendString(formatInt(int64(v)))
case int64:
w.AppendString(formatInt(v))
case uint:
w.AppendString(formatUint(uint64(v)))
case uint8:
w.AppendString(formatUint(uint64(v)))
case uint16:
w.AppendString(formatUint(uint64(v)))
case uint32:
w.AppendString(formatUint(uint64(v)))
case uint64:
w.AppendString(formatUint(v))
case float32:
w.AppendString(formatFloat(float64(v)))
case float64:
w.AppendString(formatFloat(v))
case bool:
if v {
w.AppendString("1")
} else {
w.AppendString("0")
}
case encoding.BinaryMarshaler:
b, err := v.MarshalBinary()
if err != nil {
return err
}
w.AppendBytes(b)
default:
return fmt.Errorf(
"redis: can't marshal %T (consider implementing encoding.BinaryMarshaler)", val)
}
return nil
}
func (w *WriteBuffer) AppendString(s string) {
w.b = append(w.b, StringReply)
w.b = strconv.AppendUint(w.b, uint64(len(s)), 10)
w.b = append(w.b, '\r', '\n')
w.b = append(w.b, s...)
w.b = append(w.b, '\r', '\n')
}
func (w *WriteBuffer) AppendBytes(p []byte) {
w.b = append(w.b, StringReply)
w.b = strconv.AppendUint(w.b, uint64(len(p)), 10)
w.b = append(w.b, '\r', '\n')
w.b = append(w.b, p...)
w.b = append(w.b, '\r', '\n')
}
func formatInt(n int64) string {
return strconv.FormatInt(n, 10)
}
func formatUint(u uint64) string {
return strconv.FormatUint(u, 10)
}
func formatFloat(f float64) string {
return strconv.FormatFloat(f, 'f', -1, 64)
}
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