mirror of https://github.com/ledisdb/ledisdb.git
365 lines
7.0 KiB
Go
365 lines
7.0 KiB
Go
package ledis
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import (
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"bufio"
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"bytes"
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"errors"
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"fmt"
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"io"
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"net"
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"strconv"
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"time"
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)
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// Error represents an error returned in a command reply.
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type Error string
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func (err Error) Error() string { return string(err) }
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type Conn struct {
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client *Client
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c net.Conn
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br *bufio.Reader
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bw *bufio.Writer
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// Scratch space for formatting argument length.
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// '*' or '$', length, "\r\n"
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lenScratch [32]byte
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// Scratch space for formatting integers and floats.
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numScratch [40]byte
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}
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func Connect(addr string) (*Conn, error) {
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return ConnectWithSize(addr, 4096, 4096)
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}
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func ConnectWithSize(addr string, readSize int, writeSize int) (*Conn, error) {
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c := new(Conn)
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var err error
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c.c, err = net.Dial(getProto(addr), addr)
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if err != nil {
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return nil, err
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}
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c.br = bufio.NewReaderSize(c.c, readSize)
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c.bw = bufio.NewWriterSize(c.c, writeSize)
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return c, nil
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}
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func (c *Conn) Close() {
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if c.client != nil {
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c.client.put(c)
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} else {
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c.finalize()
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}
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}
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func (c *Conn) SetReadDeadline(t time.Time) {
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c.c.SetReadDeadline(t)
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}
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func (c *Conn) SetWriteDeadline(t time.Time) {
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c.c.SetWriteDeadline(t)
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}
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func (c *Conn) Do(cmd string, args ...interface{}) (interface{}, error) {
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if err := c.Send(cmd, args...); err != nil {
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return nil, err
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}
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return c.Receive()
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}
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func (c *Conn) Send(cmd string, args ...interface{}) error {
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if err := c.writeCommand(cmd, args); err != nil {
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c.finalize()
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return err
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}
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if err := c.bw.Flush(); err != nil {
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c.finalize()
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return err
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}
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return nil
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}
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func (c *Conn) Receive() (interface{}, error) {
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if reply, err := c.readReply(); err != nil {
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c.finalize()
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return nil, err
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} else {
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if e, ok := reply.(Error); ok {
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return reply, e
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} else {
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return reply, nil
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}
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}
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}
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func (c *Conn) ReceiveBulkTo(w io.Writer) error {
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err := c.readBulkReplyTo(w)
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if err != nil {
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if _, ok := err.(Error); !ok {
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c.finalize()
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}
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}
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return err
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}
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func (c *Conn) finalize() {
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c.c.Close()
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}
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func (c *Conn) writeLen(prefix byte, n int) error {
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c.lenScratch[len(c.lenScratch)-1] = '\n'
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c.lenScratch[len(c.lenScratch)-2] = '\r'
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i := len(c.lenScratch) - 3
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for {
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c.lenScratch[i] = byte('0' + n%10)
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i -= 1
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n = n / 10
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if n == 0 {
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break
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}
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}
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c.lenScratch[i] = prefix
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_, err := c.bw.Write(c.lenScratch[i:])
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return err
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}
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func (c *Conn) writeString(s string) error {
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c.writeLen('$', len(s))
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c.bw.WriteString(s)
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_, err := c.bw.WriteString("\r\n")
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return err
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}
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func (c *Conn) writeBytes(p []byte) error {
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c.writeLen('$', len(p))
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c.bw.Write(p)
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_, err := c.bw.WriteString("\r\n")
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return err
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}
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func (c *Conn) writeInt64(n int64) error {
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return c.writeBytes(strconv.AppendInt(c.numScratch[:0], n, 10))
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}
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func (c *Conn) writeFloat64(n float64) error {
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return c.writeBytes(strconv.AppendFloat(c.numScratch[:0], n, 'g', -1, 64))
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}
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func (c *Conn) writeCommand(cmd string, args []interface{}) (err error) {
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c.writeLen('*', 1+len(args))
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err = c.writeString(cmd)
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for _, arg := range args {
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if err != nil {
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break
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}
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switch arg := arg.(type) {
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case string:
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err = c.writeString(arg)
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case []byte:
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err = c.writeBytes(arg)
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case int:
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err = c.writeInt64(int64(arg))
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case int64:
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err = c.writeInt64(arg)
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case float64:
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err = c.writeFloat64(arg)
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case bool:
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if arg {
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err = c.writeString("1")
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} else {
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err = c.writeString("0")
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}
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case nil:
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err = c.writeString("")
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default:
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var buf bytes.Buffer
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fmt.Fprint(&buf, arg)
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err = c.writeBytes(buf.Bytes())
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}
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}
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return err
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}
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func (c *Conn) readLine() ([]byte, error) {
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p, err := c.br.ReadSlice('\n')
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if err == bufio.ErrBufferFull {
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return nil, errors.New("ledis: long response line")
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}
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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, errors.New("ledis: bad response line terminator")
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}
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return p[:i], nil
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}
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// parseLen parses bulk string and array lengths.
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func parseLen(p []byte) (int, error) {
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if len(p) == 0 {
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return -1, errors.New("ledis: malformed length")
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}
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if p[0] == '-' && len(p) == 2 && p[1] == '1' {
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// handle $-1 and $-1 null replies.
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return -1, nil
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}
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var n int
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for _, b := range p {
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n *= 10
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if b < '0' || b > '9' {
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return -1, errors.New("ledis: illegal bytes in length")
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}
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n += int(b - '0')
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}
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return n, nil
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}
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// parseInt parses an integer reply.
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func parseInt(p []byte) (interface{}, error) {
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if len(p) == 0 {
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return 0, errors.New("ledis: malformed integer")
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}
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var negate bool
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if p[0] == '-' {
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negate = true
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p = p[1:]
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if len(p) == 0 {
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return 0, errors.New("ledis: malformed integer")
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}
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}
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var n int64
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for _, b := range p {
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n *= 10
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if b < '0' || b > '9' {
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return 0, errors.New("ledis: illegal bytes in length")
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}
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n += int64(b - '0')
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}
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if negate {
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n = -n
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}
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return n, nil
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}
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var (
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okReply interface{} = "OK"
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pongReply interface{} = "PONG"
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)
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func (c *Conn) readBulkReplyTo(w io.Writer) error {
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line, err := c.readLine()
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if err != nil {
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return err
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}
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if len(line) == 0 {
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return errors.New("ledis: short response line")
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}
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switch line[0] {
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case '-':
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return Error(string(line[1:]))
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case '$':
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n, err := parseLen(line[1:])
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if n < 0 || err != nil {
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return err
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}
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var nn int64
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if nn, err = io.CopyN(w, c.br, int64(n)); err != nil {
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return err
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} else if nn != int64(n) {
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return io.ErrShortWrite
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}
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if line, err := c.readLine(); err != nil {
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return err
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} else if len(line) != 0 {
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return errors.New("ledis: bad bulk string format")
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}
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return nil
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default:
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return fmt.Errorf("ledis: not invalid bulk string type, but %c", line[0])
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}
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}
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func (c *Conn) readReply() (interface{}, error) {
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line, err := c.readLine()
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if err != nil {
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return nil, err
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}
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if len(line) == 0 {
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return nil, errors.New("ledis: short response line")
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}
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switch line[0] {
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case '+':
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switch {
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case len(line) == 3 && line[1] == 'O' && line[2] == 'K':
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// Avoid allocation for frequent "+OK" response.
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return okReply, nil
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case len(line) == 5 && line[1] == 'P' && line[2] == 'O' && line[3] == 'N' && line[4] == 'G':
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// Avoid allocation in PING command benchmarks :)
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return pongReply, nil
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default:
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return string(line[1:]), nil
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}
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case '-':
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return Error(string(line[1:])), nil
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case ':':
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return parseInt(line[1:])
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case '$':
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n, err := parseLen(line[1:])
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if n < 0 || err != nil {
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return nil, err
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}
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p := make([]byte, n)
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_, err = io.ReadFull(c.br, p)
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if err != nil {
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return nil, err
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}
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if line, err := c.readLine(); err != nil {
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return nil, err
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} else if len(line) != 0 {
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return nil, errors.New("ledis: bad bulk string format")
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}
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return p, nil
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case '*':
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n, err := parseLen(line[1:])
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if n < 0 || err != nil {
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return nil, err
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}
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r := make([]interface{}, n)
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for i := range r {
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r[i], err = c.readReply()
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if err != nil {
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return nil, err
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}
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}
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return r, nil
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}
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return nil, errors.New("ledis: unexpected response line")
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}
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func (c *Client) newConn(addr string) (*Conn, error) {
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co, err := ConnectWithSize(addr, c.cfg.ReadBufferSize, c.cfg.WriteBufferSize)
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if err != nil {
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return nil, err
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}
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co.client = c
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return co, nil
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}
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