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It is recommended to improve the SDK thread safety mechanism #58

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opened 2026-02-15 21:15:30 -05:00 by yindo · 0 comments
yindo commented 2026-02-15 21:15:30 -05:00
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Originally created by @w2534073922 on GitHub (Sep 12, 2025).

Background

When developing a Dify plugin, I encountered a thread-related issue that is extremely difficult to troubleshoot:

  • In the current SDK, under the Remote (full-duplex) mode, the underlying reader/writer channels are not thread-safe.
  • When the main thread and sub-threads concurrently access the SDK session (for example, the main thread (endpoint) quickly responds to HTTP requests, and sub-threads asynchronously call reverse invocations such as self.session.app.chat.invoke), phenomena like "long waits, eventual network errors, or timeouts" occur.
  • After adjusting the code structure (such as moving external HTTP requests into sub-threads), this issue manifests as follows: when the main thread no longer performs network operations, reverse invocations in sub-threads get blocked.

Problem Analysis

  • The SDK's full-duplex implementation relies on a controlled read/write loop, which typically works stably only under specific threads/contexts.
  • When multiple threads concurrently access the same session, competition or deadlocks occur for underlying resources (sockets, readers/writers, event loops), resulting in callbacks failing to receive responses.
  • The phenomenon is extremely difficult to troubleshoot and is easily mistaken for network/business issues. In fact, it is caused by the opacity of the SDK's thread model.

Suggestions

  • It is hoped that the official SDK team:
    1. Can clearly specify the requirements and limitations for thread usage in the SDK in the documentation.
    2. Provide thread-safe invocation methods to prevent developers from encountering inexplicable issues due to thread problems.

Reproduction Method

  • Have the main thread of the plugin quickly return an HTTP response, and call self.session.app.chat.invoke in a sub-thread.
  • Or place all network operations in sub-threads, leaving the main thread idle. In this case, reverse invocations are likely to be blocked.

Expectations

  • The SDK can better support asynchronous/multi-threaded scenarios, or at the very least, prevent developers from falling into pitfalls.
  • Improve the usability and robustness of the SDK, and reduce hidden thread traps.
Originally created by @w2534073922 on GitHub (Sep 12, 2025). ## Background When developing a Dify plugin, I encountered a thread-related issue that is extremely difficult to troubleshoot: - In the current SDK, under the Remote (full-duplex) mode, the underlying reader/writer channels are not thread-safe. - When the main thread and sub-threads concurrently access the SDK session (for example, the main thread (endpoint) quickly responds to HTTP requests, and sub-threads asynchronously call reverse invocations such as self.session.app.chat.invoke), phenomena like "long waits, eventual network errors, or timeouts" occur. - After adjusting the code structure (such as moving external HTTP requests into sub-threads), this issue manifests as follows: when the main thread no longer performs network operations, reverse invocations in sub-threads get blocked. ## Problem Analysis - The SDK's full-duplex implementation relies on a controlled read/write loop, which typically works stably only under specific threads/contexts. - When multiple threads concurrently access the same session, competition or deadlocks occur for underlying resources (sockets, readers/writers, event loops), resulting in callbacks failing to receive responses. - The phenomenon is extremely difficult to troubleshoot and is easily mistaken for network/business issues. In fact, it is caused by the opacity of the SDK's thread model. ## Suggestions - It is hoped that the official SDK team: 1. Can clearly specify the requirements and limitations for thread usage in the SDK in the documentation. 2. Provide thread-safe invocation methods to prevent developers from encountering inexplicable issues due to thread problems. ## Reproduction Method - Have the main thread of the plugin quickly return an HTTP response, and call self.session.app.chat.invoke in a sub-thread. - Or place all network operations in sub-threads, leaving the main thread idle. In this case, reverse invocations are likely to be blocked. ## Expectations - The SDK can better support asynchronous/multi-threaded scenarios, or at the very least, prevent developers from falling into pitfalls. - Improve the usability and robustness of the SDK, and reduce hidden thread traps.
yindo added the enhancement label 2026-02-15 21:15:30 -05:00
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Reference: langgenius/dify-plugin-sdks#58
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