feat: update go-redis to v8, support ctx in redis methods (#1507)

* feat: update go-redis to v8, support ctx in redis methods

* fix compile errors

* chore: remove unused const

* chore: add tracing log on redis

core/stores/redis/hook.go

@@ -0,0 +1,83 @@
+package redis
+
+import (
+	"context"
+	"strings"
+	"time"
+
+	red "github.com/go-redis/redis/v8"
+	"github.com/zeromicro/go-zero/core/logx"
+	"github.com/zeromicro/go-zero/core/mapping"
+	"github.com/zeromicro/go-zero/core/timex"
+)
+
+var (
+	startTimeKey = contextKey("startTime")
+	durationHook = hook{}
+)
+
+type (
+	contextKey string
+	hook       struct{}
+)
+
+func (h hook) BeforeProcess(ctx context.Context, _ red.Cmder) (context.Context, error) {
+	return context.WithValue(ctx, startTimeKey, timex.Now()), nil
+}
+
+func (h hook) AfterProcess(ctx context.Context, cmd red.Cmder) error {
+	val := ctx.Value(startTimeKey)
+	if val == nil {
+		return nil
+	}
+
+	start, ok := val.(time.Duration)
+	if !ok {
+		return nil
+	}
+
+	duration := timex.Since(start)
+	if duration > slowThreshold.Load() {
+		logDuration(ctx, cmd, duration)
+	}
+
+	return nil
+}
+
+func (h hook) BeforeProcessPipeline(ctx context.Context, _ []red.Cmder) (context.Context, error) {
+	return context.WithValue(ctx, startTimeKey, timex.Now()), nil
+}
+
+func (h hook) AfterProcessPipeline(ctx context.Context, cmds []red.Cmder) error {
+	if len(cmds) == 0 {
+		return nil
+	}
+
+	val := ctx.Value(startTimeKey)
+	if val == nil {
+		return nil
+	}
+
+	start, ok := val.(time.Duration)
+	if !ok {
+		return nil
+	}
+
+	duration := timex.Since(start)
+	if duration > slowThreshold.Load()*time.Duration(len(cmds)) {
+		logDuration(ctx, cmds[0], duration)
+	}
+
+	return nil
+}
+
+func logDuration(ctx context.Context, cmd red.Cmder, duration time.Duration) {
+	var buf strings.Builder
+	for i, arg := range cmd.Args() {
+		if i > 0 {
+			buf.WriteByte(' ')
+		}
+		buf.WriteString(mapping.Repr(arg))
+	}
+	logx.WithContext(ctx).WithDuration(duration).Slowf("[REDIS] slowcall on executing: %s", buf.String())
+}