fix(117): split callback state to separate file (#119)

Signed-off-by: lsytj0413 <511121939@qq.com>

Signed-off-by: lsytj0413 <511121939@qq.com>

Author: lsytj0413

model/callback_state.go

@@ -0,0 +1,36 @@
+// Copyright 2022 The Serverless Workflow Specification Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package model
+
+// CallbackState executes a function and waits for callback event that indicates
+// completion of the task.
+type CallbackState struct {
+	BaseState
+	// Defines the action to be executed
+	Action Action `json:"action" validate:"required"`
+	// References a unique callback event name in the defined workflow events
+	EventRef string `json:"eventRef" validate:"required"`
+	// Time period to wait for incoming events (ISO 8601 format)
+	Timeouts *CallbackStateTimeout `json:"timeouts" validate:"omitempty"`
+	// Event data filter
+	EventDataFilter EventDataFilter `json:"eventDataFilter,omitempty"`
+}
+
+// CallbackStateTimeout defines timeout settings for callback state
+type CallbackStateTimeout struct {
+	StateExecTimeout  *StateExecTimeout `json:"stateExecTimeout,omitempty"`
+	ActionExecTimeout string            `json:"actionExecTimeout,omitempty" validate:"omitempty,iso8601duration"`
+	EventTimeout      string            `json:"eventTimeout,omitempty" validate:"omitempty,iso8601duration"`
+}

model/states.go

@@ -150,26 +150,6 @@ type InjectStateTimeout struct {
 	StateExecTimeout *StateExecTimeout `json:"stateExecTimeout,omitempty"`
 }
 
-// CallbackState ...
-type CallbackState struct {
-	BaseState
-	// Defines the action to be executed
-	Action Action `json:"action" validate:"required"`
-	// References a unique callback event name in the defined workflow events
-	EventRef string `json:"eventRef" validate:"required"`
-	// Time period to wait for incoming events (ISO 8601 format)
-	Timeouts CallbackStateTimeout `json:"timeouts" validate:"required"`
-	// Event data filter
-	EventDataFilter EventDataFilter `json:"eventDataFilter,omitempty"`
-}
-
-// CallbackStateTimeout ...
-type CallbackStateTimeout struct {
-	StateExecTimeout  *StateExecTimeout `json:"stateExecTimeout,omitempty"`
-	ActionExecTimeout string            `json:"actionExecTimeout,omitempty"`
-	EventTimeout      string            `json:"eventTimeout,omitempty"`
-}
-
 // BaseSwitchState ...
 type BaseSwitchState struct {
 	BaseState