LLM node can not produce stream response in workflow mode when IF-ELSE nested IF-ELSE #15162

yunzhuqing · 2025-03-07T02:10:18Z

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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 · 2025-03-07T02:12:59Z

@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 · 2025-03-07T02:23:05Z

`
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 · 2025-03-07T02:26:36Z

I think this should be fixed in 1.0.0

yunzhuqing · 2025-03-07T06:06:55Z

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:
marketplace_plugin_unique_identifier: langgenius/openai:0.0.7@11ec0b1909200f62b6ebf2cec1da981a9071d11c1ee0e2ef332ce89bcffa2544
kind: app
version: 0.1.5
workflow:
conversation_variables: []
environment_variables: []
features:
file_upload:
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
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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`

Nov1c444 · 2025-03-07T08:40:41Z

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:
marketplace_plugin_unique_identifier: langgenius/openai:0.0.7@11ec0b1909200f62b6ebf2cec1da981a9071d11c1ee0e2ef332ce89bcffa2544
kind: app
version: 0.1.5
workflow:
conversation_variables: []
environment_variables: []
features:
file_upload:
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
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:
edges:

data:
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sourceType: llm
targetType: end
id: 1741079850797-source-1741079855710-target
source: '1741079850797'
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target: '1741079855710'
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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.

yunzhuqing · 2025-03-07T09:08:30Z

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:
marketplace_plugin_unique_identifier: langgenius/openai:0.0.7@11ec0b1909200f62b6ebf2cec1da981a9071d11c1ee0e2ef332ce89bcffa2544
kind: app
version: 0.1.5
workflow:
conversation_variables: []
environment_variables: []
features:
file_upload:
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
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:
edges:

data:
isInIteration: false
sourceType: llm
targetType: end
id: 1741079850797-source-1741079855710-target
source: '1741079850797'
sourceHandle: source
target: '1741079855710'
targetHandle: target
type: custom
zIndex: 0

data:
isInIteration: false
sourceType: variable-aggregator
targetType: llm
id: 1741093509560-source-1741079850797-target
source: '1741093509560'
sourceHandle: source
target: '1741079850797'
targetHandle: target
type: custom
zIndex: 0

data:
isInIteration: false
sourceType: start
targetType: if-else
id: 1740992702922-source-1741178641430-target
source: '1740992702922'
sourceHandle: source
target: '1741178641430'
targetHandle: target
type: custom
zIndex: 0

data:
isInIteration: false
sourceType: if-else
targetType: code
id: 1741178641430-true-1741178777224-target
source: '1741178641430'
sourceHandle: 'true'
target: '1741178777224'
targetHandle: target
type: custom
zIndex: 0

data:
isInIteration: false
sourceType: code
targetType: if-else
id: 1741178841840-source-1741251811883-target
source: '1741178841840'
sourceHandle: source
target: '1741251811883'
targetHandle: target
type: custom
zIndex: 0

data:
isInIteration: false
sourceType: if-else
targetType: variable-aggregator
id: 1741251811883-true-1741093509560-target
selected: false
source: '1741251811883'
sourceHandle: 'true'
target: '1741093509560'
targetHandle: target
type: custom
zIndex: 0

data:
isInIteration: false
sourceType: code
targetType: if-else
id: 1741178777224-source-1741251865690-target
source: '1741178777224'
sourceHandle: source
target: '1741251865690'
targetHandle: target
type: custom
zIndex: 0

data:
isInIteration: false
sourceType: if-else
targetType: variable-aggregator
id: 1741251865690-true-1741093509560-target
selected: false
source: '1741251865690'
sourceHandle: 'true'
target: '1741093509560'
targetHandle: target
type: custom
zIndex: 0

data:
isInIteration: false
sourceType: if-else
targetType: code
id: 1741178641430-2320a209-47cc-4779-9aca-6c9c7ca3da8a-1741178841840-target
source: '1741178641430'
sourceHandle: 2320a209-47cc-4779-9aca-6c9c7ca3da8a
target: '1741178841840'
targetHandle: target
type: custom
zIndex: 0
nodes:

data:
desc: ''
selected: false
title: 开始
type: start
variables:

label: query
max_length: 48
options: []
required: true
type: text-input
variable: query
height: 89
id: '1740992702922'
position:
x: 30
y: 287
positionAbsolute:
x: 30
y: 287
selected: false
sourcePosition: right
targetPosition: left
type: custom
width: 243

data:
context:
enabled: false
variable_selector: []
desc: ''
model:
completion_params:
temperature: 0.7
mode: chat
name: gpt-4o-mini
provider: langgenius/openai/openai
prompt_template:

id: 2fbc7ba7-c14d-4fd7-b951-705db4341cee
role: system
text: 你是一个小助手, 协助用户解答问题。

id: 86073a3b-bb02-48d2-90e6-272af7fda3f0
role: user
text: '{{#1741093509560.output#}}'
selected: false
title: LLM
type: llm
variables: []
vision:
enabled: false
height: 89
id: '1741079850797'
position:
x: 1762.8571428571422
y: 495.57142857142867
positionAbsolute:
x: 1762.8571428571422
y: 495.57142857142867
selected: false
sourcePosition: right
targetPosition: left
type: custom
width: 243

data:
desc: ''
outputs:

value_selector:

'1741079850797'

text
variable: text
selected: false
title: 结束
type: end
height: 89
id: '1741079855710'
position:
x: 2171.5603164922986
y: 512.7142857142858
positionAbsolute:
x: 2171.5603164922986
y: 512.7142857142858
selected: false
sourcePosition: right
targetPosition: left
type: custom
width: 243

data:
desc: ''
output_type: string
selected: false
title: 变量聚合器
type: variable-aggregator
variables:

'1741178777224'

result

'1741178841840'

result
height: 128
id: '1741093509560'
position:
x: 1306
y: 475.57142857142867
positionAbsolute:
x: 1306
y: 475.57142857142867
selected: false
sourcePosition: right
targetPosition: left
type: custom
width: 243

data:
cases:

case_id: 'true'
conditions:

comparison_operator: contains
id: 3a674dba-945a-48f1-8c49-0c2858f5d742
value: test1
varType: string
variable_selector:

'1740992702922'

query
id: 'true'
logical_operator: and

case_id: 2320a209-47cc-4779-9aca-6c9c7ca3da8a
conditions:

comparison_operator: contains
id: dd227bb2-5a0f-4567-945d-9777eee34a87
value: test2
varType: string
variable_selector:

'1740992702922'

query
id: 2320a209-47cc-4779-9aca-6c9c7ca3da8a
logical_operator: and
desc: ''
selected: false
title: 条件分支
type: if-else
height: 173
id: '1741178641430'
position:
x: 334
y: 287
positionAbsolute:
x: 334
y: 287
selected: false
sourcePosition: right
targetPosition: left
type: custom
width: 243

data:
code: "\ndef main(arg1: str) -> dict:\n return {\n "result": arg1
\ + "是一个测试用例，测试用例的编写规范是啥，推荐一些常用的规范",\n }\n"
code_language: python3
desc: 代码执行
outputs:
result:
children: null
type: string
selected: false
title: code1
type: code
variables:

value_selector:

'1740992702922'

query
variable: arg1
height: 81
id: '1741178777224'
position:
x: 629.4285714285714
y: 194.42857142857136
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 · 2025-03-07T09:18:33Z

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

yunzhuqing · 2025-03-10T01:15:07Z

#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 · 2025-03-10T01:19:45Z

#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 · 2025-03-10T01:30:50Z

#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 · 2025-03-10T01:44:28Z

#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.

Kain-90 · 2025-03-10T05:18:52Z

same to me.

dosubot bot added the 🌊 feat:workflow label Mar 7, 2025

crazywoola added the 🤔 cant-reproduce label Mar 7, 2025

Nov1c444 mentioned this issue Mar 7, 2025

fix: nesting of conditional branches causing streaming output error #14065

Merged

5 tasks

dosubot bot mentioned this issue Mar 7, 2025

Workflow exception capture fails #15252

Open

5 tasks

crazywoola closed this as completed in #14065 Mar 11, 2025

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LLM node can not produce stream response in workflow mode when IF-ELSE nested IF-ELSE #15162

LLM node can not produce stream response in workflow mode when IF-ELSE nested IF-ELSE #15162

yunzhuqing commented Mar 7, 2025

dosubot bot commented Mar 7, 2025

yunzhuqing commented Mar 7, 2025

crazywoola commented Mar 7, 2025 •

edited

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yunzhuqing commented Mar 7, 2025

Nov1c444 commented Mar 7, 2025

yunzhuqing commented Mar 7, 2025

Nov1c444 commented Mar 7, 2025

yunzhuqing commented Mar 10, 2025

Nov1c444 commented Mar 10, 2025

yunzhuqing commented Mar 10, 2025

Nov1c444 commented Mar 10, 2025

Kain-90 commented Mar 10, 2025

LLM node can not produce stream response in workflow mode when IF-ELSE nested IF-ELSE #15162

LLM node can not produce stream response in workflow mode when IF-ELSE nested IF-ELSE #15162

Comments

yunzhuqing commented Mar 7, 2025

Self Checks

Dify version

Cloud or Self Hosted

Steps to reproduce

✔️ Expected Behavior

❌ Actual Behavior

dosubot bot commented Mar 7, 2025

yunzhuqing commented Mar 7, 2025

crazywoola commented Mar 7, 2025 • edited Loading

yunzhuqing commented Mar 7, 2025

Nov1c444 commented Mar 7, 2025

yunzhuqing commented Mar 7, 2025

Nov1c444 commented Mar 7, 2025

yunzhuqing commented Mar 10, 2025

Nov1c444 commented Mar 10, 2025

yunzhuqing commented Mar 10, 2025

Nov1c444 commented Mar 10, 2025

Kain-90 commented Mar 10, 2025

crazywoola commented Mar 7, 2025 •

edited

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