LLM node can not produce stream response in workflow mode when IF-ELSE nested IF-ELSE

[yunzhuqing]

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Dify version

0.15.3

Cloud or Self Hosted

Self Hosted (Docker)

Steps to reproduce

Workflow was defined as below:

TRUE branch will produce stream response，however, ELSE branch will block until all nodes has been executed

TRUE branch outputs is

ELSE branch outputs

The problem code maybe _fetch_node_ids_in_reachable_branch in StreamProcessor

for ELSE branch, the condition is always true, the nodes after 'IF-ELSE 2' can not be append reachable_node_ids，

these nodes will be deleted， this results stream_out_end_node_ids is always None

✔️ Expected Behavior

No response

❌ Actual Behavior

No response

[dosubot]

@yunzhuqing Hello! I'm here to help you with your reported issue. If you need assistance with bug resolution, have questions, or want to become a contributor, I'm the bot to talk to.

The issue you're encountering seems to be related to how the StreamProcessor class handles the ELSE branch in nested IF-ELSE statements. Specifically, the _fetch_node_ids_in_reachable_branch method may not be correctly identifying nodes in the ELSE branch as reachable, leading to their removal by the _remove_node_ids_in_unreachable_branch method. This results in stream_out_end_node_ids being None, which blocks the stream response until all nodes are executed.

To address this, you might want to investigate the logic within _fetch_node_ids_in_reachable_branch to ensure it correctly identifies nodes in the ELSE branch as reachable. This involves checking the conditions related to branch_identify and ensuring that nodes following an ELSE branch are not prematurely removed from the workflow execution path. Adjusting this logic should help in maintaining the integrity of the workflow and allow the ELSE branch to produce stream responses as expected.

To continue talking to Dosu, mention @dosu.

---

^{Help Dosu learn! Give it feedback: Great Response | Irrelevant Answer | Incorrect Sources | Too Verbose | Hallucination | Bug Report | Other}

[yunzhuqing]

`
def _fetch_node_ids_in_reachable_branch(self, node_id: str, branch_identify: Optional[str] = None) -> list[str]:
node_ids = []
for edge in self.graph.edge_mapping.get(node_id, []):
if edge.target_node_id == self.graph.root_node_id:
continue

        # Only follow edges that match the branch_identify or have no run_condition
        if edge.run_condition and edge.run_condition.branch_identify:
            if not branch_identify or edge.run_condition.branch_identify != branch_identify:
                continue

        node_ids.append(edge.target_node_id)
        node_ids.extend(self._fetch_node_ids_in_reachable_branch(edge.target_node_id, branch_identify))
    return node_ids

`
this condition may be useless

if edge.run_condition and edge.run_condition.branch_identify: if not branch_identify or edge.run_condition.branch_identify != branch_identify: continue

before run into _fetch_node_ids_in_reachable_branch, same condition has checked

i try to comment this segemnt, ELSE branch will work and produce stream response

[crazywoola]

I think this should be fixed in 1.0.0

[yunzhuqing]

here is my workflow yaml, maybe can help reporduce it, i try import it into https://cloud.dify.ai, i does not work yet

Can you fix it on 0.15.x, 1.x now has so many bugs
`
app:
description: ''
icon: 🤖
icon_background: '#FFEAD5'
mode: workflow
name: 复杂IF-ELSE工作流
use_icon_as_answer_icon: false
dependencies:

• current_identifier: null
  type: marketplace
  value:
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  kind: app
  version: 0.1.5
  workflow:
  conversation_variables: []
  environment_variables: []
  features:
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  - .JPG
  - .JPEG
  - .PNG
  - .GIF
  - .WEBP
  - .SVG
  allowed_file_types:
  - image
  allowed_file_upload_methods:
  - local_file
  - remote_url
  enabled: false
  fileUploadConfig:
  audio_file_size_limit: 50
  batch_count_limit: 5
  file_size_limit: 15
  image_file_size_limit: 5
  video_file_size_limit: 100
  workflow_file_upload_limit: 10
  image:
  enabled: false
  number_limits: 3
  transfer_methods:
  - local_file
  - remote_url
  number_limits: 3
  opening_statement: ''
  retriever_resource:
  enabled: true
  sensitive_word_avoidance:
  enabled: false
  speech_to_text:
  enabled: false
  suggested_questions: []
  suggested_questions_after_answer:
  enabled: false
  text_to_speech:
  enabled: false
  language: ''
  voice: ''
  graph:
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    sourceType: llm
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`

[Nov1c444]

here is my workflow yaml, maybe can help reporduce it, i try import it into https://cloud.dify.ai, i does not work yet

Can you fix it on 0.15.x, 1.x now has so many bugs ` app: description: '' icon: 🤖 icon_background: '#FFEAD5' mode: workflow name: 复杂IF-ELSE工作流 use_icon_as_answer_icon: false dependencies:

• current_identifier: null
  type: marketplace
  value:
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  kind: app
  version: 0.1.5
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  environment_variables: []
  features:
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  allowed_file_extensions:

  • .JPG
  • .JPEG
  • .PNG
  • .GIF
  • .WEBP
  • .SVG
    allowed_file_types:
  • image
    allowed_file_upload_methods:
  • local_file
  • remote_url
    enabled: false
    fileUploadConfig:
    audio_file_size_limit: 50
    batch_count_limit: 5
    file_size_limit: 15
    image_file_size_limit: 5
    video_file_size_limit: 100
    workflow_file_upload_limit: 10
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    number_limits: 3
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    opening_statement: ''
    retriever_resource:
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`

I could get the stream output successfully.

[yunzhuqing]

here is my workflow yaml, maybe can help reporduce it, i try import it into https://cloud.dify.ai, i does not work yet
Can you fix it on 0.15.x, 1.x now has so many bugs ` app: description: '' icon: 🤖 icon_background: '#FFEAD5' mode: workflow name: 复杂IF-ELSE工作流 use_icon_as_answer_icon: false dependencies:

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`

I could get the stream output successfully.

here is my workflow yaml, maybe can help reporduce it, i try import it into https://cloud.dify.ai, i does not work yet
Can you fix it on 0.15.x, 1.x now has so many bugs ` app: description: '' icon: 🤖 icon_background: '#FFEAD5' mode: workflow name: 复杂IF-ELSE工作流 use_icon_as_answer_icon: false dependencies:

• current_identifier: null
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        positionAbsolute:
        x: 629.4285714285714
        y: 194.42857142857136
        selected: false
        sourcePosition: right
        targetPosition: left
        type: custom
        width: 243

  • data:
    code: "\ndef main(arg1: str) -> dict:\n return {\n "result": arg1
    \ + "是一个linux 命令，linux 常用命令有哪些",\n }\n"
    code_language: python3
    desc: ''
    outputs:
    result:
    children: null
    type: string
    selected: false
    title: code2
    type: code
    variables:

    • value_selector:

      • '1740992702922'
      • query
        variable: arg1
        height: 53
        id: '1741178841840'
        position:
        x: 603.7142857142857
        y: 756.7142857142858
        positionAbsolute:
        x: 603.7142857142857
        y: 756.7142857142858
        selected: false
        sourcePosition: right
        targetPosition: left
        type: custom
        width: 243

  • data:
    cases:

    • case_id: 'true'
      conditions:

      • comparison_operator: contains
        id: bb7f6b2d-a8b5-4675-be8c-b192b49bf90e
        value: 命令
        varType: string
        variable_selector:

        • '1741178841840'
        • result
          id: 'true'
          logical_operator: and
          desc: ''
          selected: false
          title: 条件分支 2
          type: if-else
          height: 125
          id: '1741251811883'
          position:
          x: 957.7142857142856
          y: 715.5714285714287
          positionAbsolute:
          x: 957.7142857142856
          y: 715.5714285714287
          selected: true
          sourcePosition: right
          targetPosition: left
          type: custom
          width: 243

  • data:
    cases:

    • case_id: 'true'
      conditions:

      • comparison_operator: contains
        id: 708308cc-3d5e-4695-8c71-22c3ab00068d
        value: 规范
        varType: string
        variable_selector:

        • '1741178777224'
        • result
          id: 'true'
          logical_operator: and
          desc: ''
          selected: false
          title: 条件分支 4
          type: if-else
          height: 125
          id: '1741251865690'
          position:
          x: 946.2857142857142
          y: 186.99999999999997
          positionAbsolute:
          x: 946.2857142857142
          y: 186.99999999999997
          selected: false
          sourcePosition: right
          targetPosition: left
          type: custom
          width: 243
          viewport:
          x: 118.85777845539099
          y: 37.45000000000002
          zoom: 0.7

`

I could get the stream output successfully.

you should define two branch as below

single IF-ELSE works, because branch_identify is always true;

second branch only product one text stream

[Nov1c444]

#14065 I understand now. There was a missing edge when exporting the DSL. You can try this PR, which has fixed this issue.

[yunzhuqing]

#14065 I understand now. There was a missing edge when exporting the DSL. You can try this PR, which has fixed this issue.

i try it , but it also does not work

[Nov1c444]

#14065我现在明白了。导出 DSL 时缺少一个边缘。您可以尝试此 PR，它已修复此问题。

我试过了，但还是不行

It seems there's missing code in the previous if block. You can copy and replace the entire file directly.

[yunzhuqing]

#14065我现在明白了。导出 DSL 时缺少一个边缘。您可以尝试此 PR，它已修复此问题。

我试过了，但还是不行

It seems there's missing code in the previous if block. You can copy and replace the entire file directly.

i copied it, but the bug alse exists, it seems they are two different questions

[Nov1c444]

#14065我现在明白了。导出 DSL 时缺少一个边缘。您可以尝试此 PR，它已修复此问题。

我试过了，但还是不行

It seems there's missing code in the previous if block. You can copy and replace the entire file directly.

i copied it, but the bug alse exists, it seems they are two different questions

Uhh, this is indeed another issue. I misunderstood your meaning. I'll fix it as soon as possible.