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[PR #30832] fix(api): defer streaming response until referenced variables are updated #32972

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opened 2026-02-21 20:52:25 -05:00 by yindo · 0 comments
yindo commented 2026-02-21 20:52:25 -05:00
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Original Pull Request: https://github.com/langgenius/dify/pull/30832

State: closed
Merged: Yes

Important

  1. Make sure you have read our contribution guidelines
  2. Ensure there is an associated issue and you have been assigned to it
  3. Use the correct syntax to link this PR: Fixes #<issue number>.

Summary

Fix #30831.

Root cause: VariableAssigner v1 does not override blocks_variable_output, so the response streaming coordinator treats it as non-blocking and may start streaming Answer nodes before the conversation variable update is applied.

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Before After
image image

Checklist

  • This change requires a documentation update, included: Dify Document
  • I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
  • I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
  • I've updated the documentation accordingly.
  • I ran make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods
**Original Pull Request:** https://github.com/langgenius/dify/pull/30832 **State:** closed **Merged:** Yes --- > [!IMPORTANT] > > 1. Make sure you have read our [contribution guidelines](https://github.com/langgenius/dify/blob/main/CONTRIBUTING.md) > 1. Ensure there is an associated issue and you have been assigned to it > 1. Use the correct syntax to link this PR: `Fixes #<issue number>`. ## Summary Fix #30831. Root cause: `VariableAssigner` v1 does not override `blocks_variable_output`, so the response streaming coordinator treats it as non-blocking and may start streaming Answer nodes before the conversation variable update is applied. ## Screenshots | Before | After | |--------|-------| | <img width="455" height="329" alt="image" src="https://github.com/user-attachments/assets/7aba5954-316c-4e5f-8acd-48c1bff49974" /> | <img width="407" height="298" alt="image" src="https://github.com/user-attachments/assets/9b6c744b-ab76-41f9-97a5-abaab86dde5c" /> | ## Checklist - [ ] This change requires a documentation update, included: [Dify Document](https://github.com/langgenius/dify-docs) - [x] I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!) - [x] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change. - [x] I've updated the documentation accordingly. - [x] I ran `make lint` and `make type-check` (backend) and `cd web && npx lint-staged` (frontend) to appease the lint gods
yindo added the pull-request label 2026-02-21 20:52:25 -05:00
yindo closed this issue 2026-02-21 20:52:25 -05:00
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Reference: langgenius/dify#32972
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