forked from mirror/ledisdb
312 lines
5.5 KiB
Go
312 lines
5.5 KiB
Go
package server
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import (
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"bufio"
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"errors"
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"github.com/siddontang/go/arena"
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"github.com/siddontang/go/hack"
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"github.com/siddontang/go/log"
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"github.com/siddontang/go/num"
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"github.com/siddontang/ledisdb/ledis"
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"io"
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"net"
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"runtime"
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"strconv"
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"time"
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)
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var errReadRequest = errors.New("invalid request protocol")
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var errClientQuit = errors.New("remote client quit")
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type respClient struct {
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*client
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conn net.Conn
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rb *bufio.Reader
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ar *arena.Arena
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activeQuit bool
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}
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type respWriter struct {
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buff *bufio.Writer
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}
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func (app *App) addRespClient(c *respClient) {
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app.rcm.Lock()
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app.rcs[c] = struct{}{}
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app.rcm.Unlock()
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}
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func (app *App) delRespClient(c *respClient) {
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app.rcm.Lock()
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delete(app.rcs, c)
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app.rcm.Unlock()
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}
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func (app *App) closeAllRespClients() {
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app.rcm.Lock()
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for c := range app.rcs {
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c.conn.Close()
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}
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app.rcm.Unlock()
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}
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func (app *App) respClientNum() int {
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app.rcm.Lock()
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n := len(app.rcs)
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app.rcm.Unlock()
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return n
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}
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func newClientRESP(conn net.Conn, app *App) {
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c := new(respClient)
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c.client = newClient(app)
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c.conn = conn
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c.activeQuit = false
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if tcpConn, ok := conn.(*net.TCPConn); ok {
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tcpConn.SetReadBuffer(app.cfg.ConnReadBufferSize)
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tcpConn.SetWriteBuffer(app.cfg.ConnWriteBufferSize)
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}
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c.rb = bufio.NewReaderSize(conn, app.cfg.ConnReadBufferSize)
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c.resp = newWriterRESP(conn, app.cfg.ConnWriteBufferSize)
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c.remoteAddr = conn.RemoteAddr().String()
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//maybe another config?
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c.ar = arena.NewArena(app.cfg.ConnReadBufferSize)
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app.connWait.Add(1)
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app.addRespClient(c)
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go c.run()
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}
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func (c *respClient) run() {
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defer func() {
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if e := recover(); e != nil {
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buf := make([]byte, 4096)
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n := runtime.Stack(buf, false)
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buf = buf[0:n]
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log.Fatalf("client run panic %s:%v", buf, e)
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}
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c.client.close()
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c.conn.Close()
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if c.tx != nil {
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c.tx.Rollback()
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c.tx = nil
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}
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c.app.removeSlave(c.client, c.activeQuit)
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c.app.delRespClient(c)
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c.app.connWait.Done()
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}()
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select {
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case <-c.app.quit:
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//check app closed
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return
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default:
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break
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}
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kc := time.Duration(c.app.cfg.ConnKeepaliveInterval) * time.Second
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for {
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if kc > 0 {
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c.conn.SetReadDeadline(time.Now().Add(kc))
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}
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reqData, err := c.readRequest()
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if err == nil {
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err = c.handleRequest(reqData)
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}
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if err != nil {
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return
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}
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}
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}
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func (c *respClient) readRequest() ([][]byte, error) {
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return ReadRequest(c.rb, c.ar)
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}
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func (c *respClient) handleRequest(reqData [][]byte) error {
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if len(reqData) == 0 {
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c.cmd = ""
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c.args = reqData[0:0]
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} else {
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c.cmd = hack.String(lowerSlice(reqData[0]))
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c.args = reqData[1:]
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}
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if c.cmd == "quit" {
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c.activeQuit = true
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c.resp.writeStatus(OK)
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c.resp.flush()
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c.conn.Close()
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return errClientQuit
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}
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c.perform()
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c.cmd = ""
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c.args = nil
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c.ar.Reset()
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return nil
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}
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// response writer
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func newWriterRESP(conn net.Conn, size int) *respWriter {
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w := new(respWriter)
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w.buff = bufio.NewWriterSize(conn, size)
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return w
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}
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func (w *respWriter) writeError(err error) {
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w.buff.Write(hack.Slice("-ERR"))
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if err != nil {
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w.buff.WriteByte(' ')
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w.buff.Write(hack.Slice(err.Error()))
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}
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w.buff.Write(Delims)
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}
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func (w *respWriter) writeStatus(status string) {
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w.buff.WriteByte('+')
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w.buff.Write(hack.Slice(status))
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w.buff.Write(Delims)
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}
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func (w *respWriter) writeInteger(n int64) {
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w.buff.WriteByte(':')
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w.buff.Write(num.FormatInt64ToSlice(n))
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w.buff.Write(Delims)
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}
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func (w *respWriter) writeBulk(b []byte) {
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w.buff.WriteByte('$')
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if b == nil {
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w.buff.Write(NullBulk)
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} else {
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w.buff.Write(hack.Slice(strconv.Itoa(len(b))))
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w.buff.Write(Delims)
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w.buff.Write(b)
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}
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w.buff.Write(Delims)
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}
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func (w *respWriter) writeArray(lst []interface{}) {
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w.buff.WriteByte('*')
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if lst == nil {
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w.buff.Write(NullArray)
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w.buff.Write(Delims)
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} else {
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w.buff.Write(hack.Slice(strconv.Itoa(len(lst))))
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w.buff.Write(Delims)
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for i := 0; i < len(lst); i++ {
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switch v := lst[i].(type) {
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case []interface{}:
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w.writeArray(v)
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case [][]byte:
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w.writeSliceArray(v)
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case []byte:
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w.writeBulk(v)
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case nil:
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w.writeBulk(nil)
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case int64:
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w.writeInteger(v)
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default:
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panic("invalid array type")
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}
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}
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}
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}
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func (w *respWriter) writeSliceArray(lst [][]byte) {
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w.buff.WriteByte('*')
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if lst == nil {
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w.buff.Write(NullArray)
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w.buff.Write(Delims)
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} else {
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w.buff.Write(hack.Slice(strconv.Itoa(len(lst))))
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w.buff.Write(Delims)
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for i := 0; i < len(lst); i++ {
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w.writeBulk(lst[i])
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}
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}
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}
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func (w *respWriter) writeFVPairArray(lst []ledis.FVPair) {
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w.buff.WriteByte('*')
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if lst == nil {
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w.buff.Write(NullArray)
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w.buff.Write(Delims)
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} else {
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w.buff.Write(hack.Slice(strconv.Itoa(len(lst) * 2)))
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w.buff.Write(Delims)
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for i := 0; i < len(lst); i++ {
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w.writeBulk(lst[i].Field)
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w.writeBulk(lst[i].Value)
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}
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}
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}
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func (w *respWriter) writeScorePairArray(lst []ledis.ScorePair, withScores bool) {
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w.buff.WriteByte('*')
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if lst == nil {
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w.buff.Write(NullArray)
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w.buff.Write(Delims)
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} else {
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if withScores {
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w.buff.Write(hack.Slice(strconv.Itoa(len(lst) * 2)))
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w.buff.Write(Delims)
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} else {
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w.buff.Write(hack.Slice(strconv.Itoa(len(lst))))
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w.buff.Write(Delims)
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}
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for i := 0; i < len(lst); i++ {
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w.writeBulk(lst[i].Member)
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if withScores {
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w.writeBulk(num.FormatInt64ToSlice(lst[i].Score))
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}
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}
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}
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}
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func (w *respWriter) writeBulkFrom(n int64, rb io.Reader) {
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w.buff.WriteByte('$')
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w.buff.Write(hack.Slice(strconv.FormatInt(n, 10)))
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w.buff.Write(Delims)
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io.Copy(w.buff, rb)
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w.buff.Write(Delims)
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}
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func (w *respWriter) flush() {
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w.buff.Flush()
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}
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