FEAT: NEW WORKFLOW ENGINE (#3160)

Co-authored-by: Joel <iamjoel007@gmail.com>
Co-authored-by: Yeuoly <admin@srmxy.cn>
Co-authored-by: JzoNg <jzongcode@gmail.com>
Co-authored-by: StyleZhang <jasonapring2015@outlook.com>
Co-authored-by: jyong <jyong@dify.ai>
Co-authored-by: nite-knite <nkCoding@gmail.com>
Co-authored-by: jyong <718720800@qq.com>

web/app/components/workflow/nodes/variable-assigner/default.ts

@@ -0,0 +1,42 @@
+import { type NodeDefault, VarType } from '../../types'
+import { BlockEnum } from '../../types'
+import type { VariableAssignerNodeType } from './types'
+import { ALL_CHAT_AVAILABLE_BLOCKS, ALL_COMPLETION_AVAILABLE_BLOCKS } from '@/app/components/workflow/constants'
+
+const i18nPrefix = 'workflow'
+
+const nodeDefault: NodeDefault<VariableAssignerNodeType> = {
+  defaultValue: {
+    output_type: VarType.string,
+    variables: [],
+  },
+  getAvailablePrevNodes(isChatMode: boolean) {
+    const nodes = isChatMode
+      ? ALL_CHAT_AVAILABLE_BLOCKS
+      : ALL_COMPLETION_AVAILABLE_BLOCKS.filter(type => type !== BlockEnum.End)
+    return nodes.filter(type => type !== BlockEnum.IfElse && type !== BlockEnum.QuestionClassifier)
+  },
+  getAvailableNextNodes(isChatMode: boolean) {
+    const nodes = isChatMode ? ALL_CHAT_AVAILABLE_BLOCKS : ALL_COMPLETION_AVAILABLE_BLOCKS
+    return nodes
+  },
+  checkValid(payload: VariableAssignerNodeType, t: any) {
+    let errorMessages = ''
+    const { variables } = payload
+    if (!variables || variables.length === 0)
+      errorMessages = t(`${i18nPrefix}.errorMsg.fieldRequired`, { field: t(`${i18nPrefix}.nodes.variableAssigner.title`) })
+    if (!errorMessages) {
+      variables.forEach((variable) => {
+        if (!variable || variable.length === 0)
+          errorMessages = t(`${i18nPrefix}.errorMsg.fieldRequired`, { field: t(`${i18nPrefix}.errorMsg.fields.variableValue`) })
+      })
+    }
+
+    return {
+      isValid: !errorMessages,
+      errorMessage: errorMessages,
+    }
+  },
+}
+
+export default nodeDefault