mirror of https://github.com/ledisdb/ledisdb.git
137 lines
2.3 KiB
Go
137 lines
2.3 KiB
Go
package server
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import (
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"bufio"
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"errors"
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"fmt"
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"github.com/siddontang/go/arena"
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"io"
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)
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var (
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errLineFormat = errors.New("bad response line format")
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)
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func ReadLine(rb *bufio.Reader) ([]byte, error) {
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p, err := rb.ReadSlice('\n')
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if err != nil {
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return nil, err
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}
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i := len(p) - 2
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if i < 0 || p[i] != '\r' {
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return nil, errLineFormat
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}
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return p[:i], nil
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}
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func readBytes(br *bufio.Reader, a *arena.Arena) (bytes []byte, err error) {
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size, err := readLong(br)
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if err != nil {
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return nil, err
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}
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if size == -1 {
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return nil, nil
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}
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if size < 0 {
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return nil, errors.New("Invalid size: " + fmt.Sprint("%d", size))
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}
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buf := a.Make(int(size) + 2)
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if _, err = io.ReadFull(br, buf); err != nil {
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return nil, err
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}
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if buf[len(buf)-2] != '\r' && buf[len(buf)-1] != '\n' {
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return nil, errors.New("bad bulk string format")
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}
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bytes = buf[0 : len(buf)-2]
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return
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}
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func readLong(in *bufio.Reader) (result int64, err error) {
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read, err := in.ReadByte()
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if err != nil {
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return -1, err
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}
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var sign int
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if read == '-' {
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read, err = in.ReadByte()
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if err != nil {
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return -1, err
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}
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sign = -1
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} else {
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sign = 1
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}
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var number int64
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for number = 0; err == nil; read, err = in.ReadByte() {
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if read == '\r' {
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read, err = in.ReadByte()
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if err != nil {
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return -1, err
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}
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if read == '\n' {
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return number * int64(sign), nil
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} else {
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return -1, errors.New("Bad line ending")
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}
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}
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value := read - '0'
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if value >= 0 && value < 10 {
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number *= 10
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number += int64(value)
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} else {
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return -1, errors.New("Invalid digit")
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}
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}
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return -1, err
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}
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func ReadRequest(in *bufio.Reader, a *arena.Arena) ([][]byte, error) {
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code, err := in.ReadByte()
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if err != nil {
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return nil, err
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}
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if code != '*' {
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return nil, errReadRequest
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}
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var nparams int64
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if nparams, err = readLong(in); err != nil {
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return nil, err
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} else if nparams <= 0 {
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return nil, errReadRequest
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}
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req := make([][]byte, nparams)
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for i := range req {
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if code, err = in.ReadByte(); err != nil {
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return nil, err
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} else if code != '$' {
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return nil, errReadRequest
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}
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if req[i], err = readBytes(in, a); err != nil {
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return nil, err
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}
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}
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return req, nil
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}
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func lowerSlice(buf []byte) []byte {
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for i, r := range buf {
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if 'A' <= r && r <= 'Z' {
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r += 'a' - 'A'
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}
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buf[i] = r
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}
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return buf
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}
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