update memcache library

- support read timeout from context
- fix miss prometheus metrics on some method

pkg/cache/memcache/ascii_conn.go

@@ -66,9 +66,9 @@ func replyToError(line []byte) error {
 }
 
 func (c *asiiConn) Populate(ctx context.Context, cmd string, key string, flags uint32, expiration int32, cas uint64, data []byte) error {
+	var err error
 	c.conn.SetWriteDeadline(shrinkDeadline(ctx, c.writeTimeout))
 	// <command name> <key> <flags> <exptime> <bytes> [noreply]\r\n
-	var err error
 	if cmd == "cas" {
 		_, err = fmt.Fprintf(c.rw, "%s %s %d %d %d %d\r\n", cmd, key, flags, expiration, len(data), cas)
 	} else {
@@ -127,14 +127,14 @@ func (c *asiiConn) Err() error {
 }
 
 func (c *asiiConn) Get(ctx context.Context, key string) (result *Item, err error) {
-	c.conn.SetWriteDeadline(time.Now().Add(c.writeTimeout))
+	c.conn.SetWriteDeadline(shrinkDeadline(ctx, c.writeTimeout))
 	if _, err = fmt.Fprintf(c.rw, "gets %s\r\n", key); err != nil {
 		return nil, c.fatal(err)
 	}
 	if err = c.rw.Flush(); err != nil {
 		return nil, c.fatal(err)
 	}
-	if err = c.parseGetReply(func(it *Item) {
+	if err = c.parseGetReply(ctx, func(it *Item) {
 		result = it
 	}); err != nil {
 		return
@@ -155,7 +155,7 @@ func (c *asiiConn) GetMulti(ctx context.Context, keys ...string) (map[string]*It
 		return nil, c.fatal(err)
 	}
 	results := make(map[string]*Item, len(keys))
-	if err = c.parseGetReply(func(it *Item) {
+	if err = c.parseGetReply(ctx, func(it *Item) {
 		results[it.Key] = it
 	}); err != nil {
 		return nil, err
@@ -163,8 +163,8 @@ func (c *asiiConn) GetMulti(ctx context.Context, keys ...string) (map[string]*It
 	return results, nil
 }
 
-func (c *asiiConn) parseGetReply(f func(*Item)) error {
-	c.conn.SetReadDeadline(shrinkDeadline(context.TODO(), c.readTimeout))
+func (c *asiiConn) parseGetReply(ctx context.Context, f func(*Item)) error {
+	c.conn.SetReadDeadline(shrinkDeadline(ctx, c.readTimeout))
 	for {
 		line, err := c.rw.ReadSlice('\n')
 		if err != nil {
@@ -209,7 +209,7 @@ func scanGetReply(line []byte, item *Item) (size int, err error) {
 }
 
 func (c *asiiConn) Touch(ctx context.Context, key string, expire int32) error {
-	line, err := c.writeReadLine("touch %s %d\r\n", key, expire)
+	line, err := c.writeReadLine(ctx, "touch %s %d\r\n", key, expire)
 	if err != nil {
 		return err
 	}
@@ -217,7 +217,7 @@ func (c *asiiConn) Touch(ctx context.Context, key string, expire int32) error {
 }
 
 func (c *asiiConn) IncrDecr(ctx context.Context, cmd, key string, delta uint64) (uint64, error) {
-	line, err := c.writeReadLine("%s %s %d\r\n", cmd, key, delta)
+	line, err := c.writeReadLine(ctx, "%s %s %d\r\n", cmd, key, delta)
 	if err != nil {
 		return 0, err
 	}
@@ -236,23 +236,24 @@ func (c *asiiConn) IncrDecr(ctx context.Context, cmd, key string, delta uint64)
 }
 
 func (c *asiiConn) Delete(ctx context.Context, key string) error {
-	line, err := c.writeReadLine("delete %s\r\n", key)
+	line, err := c.writeReadLine(ctx, "delete %s\r\n", key)
 	if err != nil {
 		return err
 	}
 	return replyToError(line)
 }
 
-func (c *asiiConn) writeReadLine(format string, args ...interface{}) ([]byte, error) {
-	c.conn.SetWriteDeadline(shrinkDeadline(context.TODO(), c.writeTimeout))
-	_, err := fmt.Fprintf(c.rw, format, args...)
+func (c *asiiConn) writeReadLine(ctx context.Context, format string, args ...interface{}) ([]byte, error) {
+	var err error
+	c.conn.SetWriteDeadline(shrinkDeadline(ctx, c.writeTimeout))
+	_, err = fmt.Fprintf(c.rw, format, args...)
 	if err != nil {
 		return nil, c.fatal(pkgerr.WithStack(err))
 	}
 	if err = c.rw.Flush(); err != nil {
 		return nil, c.fatal(pkgerr.WithStack(err))
 	}
-	c.conn.SetReadDeadline(shrinkDeadline(context.TODO(), c.readTimeout))
+	c.conn.SetReadDeadline(shrinkDeadline(ctx, c.readTimeout))
 	line, err := c.rw.ReadSlice('\n')
 	if err != nil {
 		return line, c.fatal(pkgerr.WithStack(err))

pkg/cache/memcache/pool_conn.go

@@ -86,7 +86,7 @@ func (pc *poolConn) Err() error {
 }
 
 func (pc *poolConn) Set(item *Item) (err error) {
-	return pc.c.SetContext(pc.ctx, item)
+	return pc.SetContext(pc.ctx, item)
 }
 
 func (pc *poolConn) Add(item *Item) (err error) {
@@ -102,15 +102,15 @@ func (pc *poolConn) CompareAndSwap(item *Item) (err error) {
 }
 
 func (pc *poolConn) Get(key string) (r *Item, err error) {
-	return pc.c.GetContext(pc.ctx, key)
+	return pc.GetContext(pc.ctx, key)
 }
 
 func (pc *poolConn) GetMulti(keys []string) (res map[string]*Item, err error) {
-	return pc.c.GetMultiContext(pc.ctx, keys)
+	return pc.GetMultiContext(pc.ctx, keys)
 }
 
 func (pc *poolConn) Touch(key string, timeout int32) (err error) {
-	return pc.c.TouchContext(pc.ctx, key, timeout)
+	return pc.TouchContext(pc.ctx, key, timeout)
 }
 
 func (pc *poolConn) Scan(item *Item, v interface{}) error {
@@ -118,15 +118,15 @@ func (pc *poolConn) Scan(item *Item, v interface{}) error {
 }
 
 func (pc *poolConn) Delete(key string) (err error) {
-	return pc.c.DeleteContext(pc.ctx, key)
+	return pc.DeleteContext(pc.ctx, key)
 }
 
 func (pc *poolConn) Increment(key string, delta uint64) (newValue uint64, err error) {
-	return pc.c.IncrementContext(pc.ctx, key, delta)
+	return pc.IncrementContext(pc.ctx, key, delta)
 }
 
 func (pc *poolConn) Decrement(key string, delta uint64) (newValue uint64, err error) {
-	return pc.c.DecrementContext(pc.ctx, key, delta)
+	return pc.DecrementContext(pc.ctx, key, delta)
 }
 
 func (pc *poolConn) AddContext(ctx context.Context, item *Item) error {

pkg/cache/memcache/util.go

@@ -80,10 +80,9 @@ func ProtobufItem(key string, message proto.Message, flags uint32, expiration in
 }
 
 func shrinkDeadline(ctx context.Context, timeout time.Duration) time.Time {
-	// TODO: ignored context deadline to compatible old behaviour.
-	//deadline, ok := ctx.Deadline()
-	//if ok {
-	//	return deadline
-	//}
-	return time.Now().Add(timeout)
+	timeoutTime := time.Now().Add(timeout)
+	if deadline, ok := ctx.Deadline(); ok && timeoutTime.After(deadline) {
+		return deadline
+	}
+	return timeoutTime
 }

pkg/cache/memcache/util_test.go

@@ -1,7 +1,9 @@
 package memcache
 
 import (
+	"context"
 	"testing"
+	"time"
 
 	pb "github.com/bilibili/kratos/pkg/cache/memcache/test"
 
@@ -73,3 +75,31 @@ func TestLegalKey(t *testing.T) {
 		})
 	}
 }
+
+func TestShrinkDeadline(t *testing.T) {
+	t.Run("test not deadline", func(t *testing.T) {
+		timeout := time.Second
+		timeoutTime := time.Now().Add(timeout)
+		tm := shrinkDeadline(context.Background(), timeout)
+		assert.True(t, tm.After(timeoutTime))
+	})
+	t.Run("test big deadline", func(t *testing.T) {
+		timeout := time.Second
+		timeoutTime := time.Now().Add(timeout)
+		deadlineTime := time.Now().Add(2 * time.Second)
+		ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
+		defer cancel()
+
+		tm := shrinkDeadline(ctx, timeout)
+		assert.True(t, tm.After(timeoutTime) && tm.Before(deadlineTime))
+	})
+	t.Run("test small deadline", func(t *testing.T) {
+		timeout := time.Second
+		deadlineTime := time.Now().Add(500 * time.Millisecond)
+		ctx, cancel := context.WithTimeout(context.Background(), 500*time.Millisecond)
+		defer cancel()
+
+		tm := shrinkDeadline(ctx, timeout)
+		assert.True(t, tm.After(deadlineTime) && tm.Before(time.Now().Add(timeout)))
+	})
+}