Making command structs digestable (#2716)

* intial move

* adding stringcmdable

* moving module commands to align with other changes

---------

Co-authored-by: ofekshenawa <104765379+ofekshenawa@users.noreply.github.com>
Co-authored-by: ofekshenawa <ofek.shenawa@redis.com>

osscluster_commands.go

@@ -0,0 +1,109 @@
+package redis
+
+import (
+	"context"
+	"sync"
+	"sync/atomic"
+)
+
+func (c *ClusterClient) DBSize(ctx context.Context) *IntCmd {
+	cmd := NewIntCmd(ctx, "dbsize")
+	_ = c.withProcessHook(ctx, cmd, func(ctx context.Context, _ Cmder) error {
+		var size int64
+		err := c.ForEachMaster(ctx, func(ctx context.Context, master *Client) error {
+			n, err := master.DBSize(ctx).Result()
+			if err != nil {
+				return err
+			}
+			atomic.AddInt64(&size, n)
+			return nil
+		})
+		if err != nil {
+			cmd.SetErr(err)
+		} else {
+			cmd.val = size
+		}
+		return nil
+	})
+	return cmd
+}
+
+func (c *ClusterClient) ScriptLoad(ctx context.Context, script string) *StringCmd {
+	cmd := NewStringCmd(ctx, "script", "load", script)
+	_ = c.withProcessHook(ctx, cmd, func(ctx context.Context, _ Cmder) error {
+		var mu sync.Mutex
+		err := c.ForEachShard(ctx, func(ctx context.Context, shard *Client) error {
+			val, err := shard.ScriptLoad(ctx, script).Result()
+			if err != nil {
+				return err
+			}
+
+			mu.Lock()
+			if cmd.Val() == "" {
+				cmd.val = val
+			}
+			mu.Unlock()
+
+			return nil
+		})
+		if err != nil {
+			cmd.SetErr(err)
+		}
+		return nil
+	})
+	return cmd
+}
+
+func (c *ClusterClient) ScriptFlush(ctx context.Context) *StatusCmd {
+	cmd := NewStatusCmd(ctx, "script", "flush")
+	_ = c.withProcessHook(ctx, cmd, func(ctx context.Context, _ Cmder) error {
+		err := c.ForEachShard(ctx, func(ctx context.Context, shard *Client) error {
+			return shard.ScriptFlush(ctx).Err()
+		})
+		if err != nil {
+			cmd.SetErr(err)
+		}
+		return nil
+	})
+	return cmd
+}
+
+func (c *ClusterClient) ScriptExists(ctx context.Context, hashes ...string) *BoolSliceCmd {
+	args := make([]interface{}, 2+len(hashes))
+	args[0] = "script"
+	args[1] = "exists"
+	for i, hash := range hashes {
+		args[2+i] = hash
+	}
+	cmd := NewBoolSliceCmd(ctx, args...)
+
+	result := make([]bool, len(hashes))
+	for i := range result {
+		result[i] = true
+	}
+
+	_ = c.withProcessHook(ctx, cmd, func(ctx context.Context, _ Cmder) error {
+		var mu sync.Mutex
+		err := c.ForEachShard(ctx, func(ctx context.Context, shard *Client) error {
+			val, err := shard.ScriptExists(ctx, hashes...).Result()
+			if err != nil {
+				return err
+			}
+
+			mu.Lock()
+			for i, v := range val {
+				result[i] = result[i] && v
+			}
+			mu.Unlock()
+
+			return nil
+		})
+		if err != nil {
+			cmd.SetErr(err)
+		} else {
+			cmd.val = result
+		}
+		return nil
+	})
+	return cmd
+}