add some unittests and bug fix

redis/server/conn.go

@@ -0,0 +1,92 @@
+package server
+
+import (
+	"github.com/hdt3213/godis/lib/sync/wait"
+	"net"
+	"sync"
+	"time"
+)
+
+// Connection represents a connection with a redis-cli
+type Connection struct {
+	conn net.Conn
+
+	// waiting util reply finished
+	waitingReply wait.Wait
+
+	// lock while server sending response
+	mu sync.Mutex
+
+	// subscribing channels
+	subs map[string]bool
+}
+
+// Close disconnect with the client
+func (c *Connection) Close() error {
+	c.waitingReply.WaitWithTimeout(10 * time.Second)
+	_ = c.conn.Close()
+	return nil
+}
+
+// NewConn creates Connection instance
+func NewConn(conn net.Conn) *Connection {
+	return &Connection{
+		conn: conn,
+	}
+}
+
+// Write sends response to client over tcp connection
+func (c *Connection) Write(b []byte) error {
+	if len(b) == 0 {
+		return nil
+	}
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	_, err := c.conn.Write(b)
+	return err
+}
+
+// Subscribe add current connection into subscribers of the given channel
+func (c *Connection) Subscribe(channel string) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	if c.subs == nil {
+		c.subs = make(map[string]bool)
+	}
+	c.subs[channel] = true
+}
+
+// UnSubscribe removes current connection into subscribers of the given channel
+func (c *Connection) UnSubscribe(channel string) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	if c.subs == nil {
+		return
+	}
+	delete(c.subs, channel)
+}
+
+// SubsCount returns the number of subscribing channels
+func (c *Connection) SubsCount() int {
+	if c.subs == nil {
+		return 0
+	}
+	return len(c.subs)
+}
+
+// GetChannels returns all subscribing channels
+func (c *Connection) GetChannels() []string {
+	if c.subs == nil {
+		return make([]string, 0)
+	}
+	channels := make([]string, len(c.subs))
+	i := 0
+	for channel := range c.subs {
+		channels[i] = channel
+		i++
+	}
+	return channels
+}