From 863ed0ce6e7ed4e0d0ae0bb0f4b57695a1c0ba12 Mon Sep 17 00:00:00 2001
From: pradeepnnv <pradeepnnv@gmail.com>
Date: Thu, 23 Feb 2023 21:03:44 -0600
Subject: [PATCH] add now function

Signed-off-by: pradeepnnv <pradeepnnv@gmail.com>
---
 .../transform/action/datetime/now.go          | 18 ++++++++++++++++
 .../transform/function/datatime_functions.go  | 21 +++++++++++++++++++
 2 files changed, 39 insertions(+)
 create mode 100644 internal/primitive/transform/action/datetime/now.go

diff --git a/internal/primitive/transform/action/datetime/now.go b/internal/primitive/transform/action/datetime/now.go
new file mode 100644
index 000000000..b571b0a2a
--- /dev/null
+++ b/internal/primitive/transform/action/datetime/now.go
@@ -0,0 +1,18 @@
+package datetime
+
+import (
+	"github.com/linkall-labs/vanus/internal/primitive/transform/action"
+	"github.com/linkall-labs/vanus/internal/primitive/transform/arg"
+	"github.com/linkall-labs/vanus/internal/primitive/transform/function"
+)
+
+func now() action.Action {
+	a := &action.SourceTargetSameAction{}
+	a.CommonAction = action.CommonAction{
+		ActionName:  "NOW",
+		FixedArgs:   []arg.TypeList{arg.EventList, arg.All},
+		VariadicArg: arg.All,
+		Fn:          function.NowFunction,
+	}
+	return a
+}
diff --git a/internal/primitive/transform/function/datatime_functions.go b/internal/primitive/transform/function/datatime_functions.go
index 908befb39..7e4729eba 100644
--- a/internal/primitive/transform/function/datatime_functions.go
+++ b/internal/primitive/transform/function/datatime_functions.go
@@ -60,3 +60,24 @@ var UnixTimeFormatFunction = function{
 		return t.In(loc).Format(format), nil
 	},
 }
+
+var NowFunction = function{
+	name:         "NOW",
+	fixedArgs:    []common.Type{common.String, common.String},
+	variadicArgs: common.TypePtr(common.String),
+	fn: func(args []interface{}) (interface{}, error) {
+		t, err := time.ParseInLocation(time.RFC3339, args[0].(string), time.UTC)
+		if err != nil {
+			return nil, err
+		}
+		loc := time.UTC
+		if len(args) > 2 && args[2].(string) != "" {
+			loc, err = time.LoadLocation(args[2].(string))
+			if err != nil {
+				return nil, err
+			}
+		}
+		format := util.ConvertFormat2Go(args[1].(string))
+		return t.In(loc).Format(format), nil
+	},
+}