mirror of https://github.com/go-redis/redis.git
133 lines
2.3 KiB
Go
133 lines
2.3 KiB
Go
package redis
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import (
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"fmt"
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"sync"
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)
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type MultiClient struct {
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*Client
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execMtx sync.Mutex
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}
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func (c *Client) MultiClient() (*MultiClient, error) {
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return &MultiClient{
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Client: &Client{
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BaseClient: &BaseClient{
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ConnPool: NewSingleConnPool(c.ConnPool, true),
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InitConn: c.InitConn,
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},
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},
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}, nil
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}
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func (c *MultiClient) Close() error {
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c.Unwatch()
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return c.Client.Close()
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}
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func (c *MultiClient) Watch(keys ...string) *StatusReq {
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args := append([]string{"WATCH"}, keys...)
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req := NewStatusReq(args...)
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c.Process(req)
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return req
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}
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func (c *MultiClient) Unwatch(keys ...string) *StatusReq {
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args := append([]string{"UNWATCH"}, keys...)
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req := NewStatusReq(args...)
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c.Process(req)
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return req
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}
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func (c *MultiClient) Discard() {
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c.reqsMtx.Lock()
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if c.reqs == nil {
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panic("Discard can be used only inside Exec")
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}
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c.reqs = c.reqs[:1]
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c.reqsMtx.Unlock()
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}
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func (c *MultiClient) Exec(do func()) ([]Req, error) {
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c.reqsMtx.Lock()
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c.reqs = []Req{NewStatusReq("MULTI")}
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c.reqsMtx.Unlock()
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do()
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c.Queue(NewIfaceSliceReq("EXEC"))
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c.reqsMtx.Lock()
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reqs := c.reqs
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c.reqs = nil
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c.reqsMtx.Unlock()
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if len(reqs) == 2 {
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return []Req{}, nil
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}
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conn, err := c.conn()
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if err != nil {
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return nil, err
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}
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// Synchronize writes and reads to the connection using mutex.
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c.execMtx.Lock()
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err = c.ExecReqs(reqs, conn)
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c.execMtx.Unlock()
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if err != nil {
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c.ConnPool.Remove(conn)
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return nil, err
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}
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c.ConnPool.Add(conn)
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return reqs[1 : len(reqs)-1], nil
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}
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func (c *MultiClient) ExecReqs(reqs []Req, conn *Conn) error {
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err := c.WriteReq(conn, reqs...)
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if err != nil {
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return err
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}
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statusReq := NewStatusReq()
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// Omit last request (EXEC).
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reqsLen := len(reqs) - 1
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// Parse queued replies.
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for i := 0; i < reqsLen; i++ {
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_, err = statusReq.ParseReply(conn.Rd)
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if err != nil {
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return err
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}
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}
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// Parse number of replies.
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line, err := readLine(conn.Rd)
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if err != nil {
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return err
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}
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if line[0] != '*' {
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return fmt.Errorf("Expected '*', but got line %q", line)
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}
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if len(line) == 3 && line[1] == '-' && line[2] == '1' {
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return Nil
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}
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// Parse replies.
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// Loop starts from 1 to omit first request (MULTI).
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for i := 1; i < reqsLen; i++ {
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req := reqs[i]
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val, err := req.ParseReply(conn.Rd)
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if err != nil {
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req.SetErr(err)
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} else {
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req.SetVal(val)
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}
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}
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return nil
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}
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