Feature/add ability to show variable output (#3580)

add ability to show variable output

Author: HenryHengZJ

packages/components/nodes/utilities/SetVariable/SetVariable.ts

@@ -16,7 +16,7 @@ class SetVariable_Utilities implements INode {
     constructor() {
         this.label = 'Set Variable'
         this.name = 'setVariable'
-        this.version = 2.0
+        this.version = 2.1
         this.type = 'SetVariable'
         this.icon = 'setvar.svg'
         this.category = 'Utilities'
@@ -36,6 +36,14 @@ class SetVariable_Utilities implements INode {
                 name: 'variableName',
                 type: 'string',
                 placeholder: 'var1'
+            },
+            {
+                label: 'Show Output',
+                name: 'showOutput',
+                description: 'Show the output result in the Prediction API response',
+                type: 'boolean',
+                optional: true,
+                additionalParams: true
             }
         ]
         this.outputs = [

packages/server/src/utils/buildChatflow.ts

@@ -249,6 +249,8 @@ export const utilBuildChatflow = async (req: Request, isInternal: boolean = fals
         // Get prepend messages
         const prependMessages = incomingInput.history
 
+        const flowVariables = {} as Record<string, unknown>
+
         /*   Reuse the flow without having to rebuild (to avoid duplicated upsert, recomputation, reinitialization of memory) when all these conditions met:
          * - Reuse of flows is not disabled
          * - Node Data already exists in pool
@@ -378,6 +380,18 @@ export const utilBuildChatflow = async (req: Request, isInternal: boolean = fals
                 baseURL
             })
 
+            // Show output of setVariable nodes in the response
+            for (const node of reactFlowNodes) {
+                if (
+                    node.data.name === 'setVariable' &&
+                    (node.data.inputs?.showOutput === true || node.data.inputs?.showOutput === 'true')
+                ) {
+                    const outputResult = node.data.instance
+                    const variableKey = node.data.inputs?.variableName
+                    flowVariables[variableKey] = outputResult
+                }
+            }
+
             const nodeToExecute =
                 endingNodeIds.length === 1
                     ? reactFlowNodes.find((node: IReactFlowNode) => endingNodeIds[0] === node.id)
@@ -525,6 +539,7 @@ export const utilBuildChatflow = async (req: Request, isInternal: boolean = fals
 
         if (sessionId) result.sessionId = sessionId
         if (memoryType) result.memoryType = memoryType
+        if (Object.keys(flowVariables).length) result.flowVariables = flowVariables
 
         return result
     } catch (e) {