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Add psycopg dependencies instruction for checkpointing (#564)

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* Add psycopg dependencies instruction for checkpointing

* fix: update Dockerfile to improve dependency installation process
This commit is contained in:
CHANGXUBO
2025-09-09 17:28:18 +08:00
committed by GitHub
parent 38ff2f7276
commit 7138ba36bc
2 changed files with 19 additions and 1 deletions
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5
Dockerfile
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@@ -3,6 +3,11 @@ FROM ghcr.io/astral-sh/uv:python3.12-bookworm
# Install uv.
COPY --from=ghcr.io/astral-sh/uv:latest /uv /bin/uv
# Install system dependencies including libpq
RUN apt-get update && apt-get install -y \
libpq-dev \
&& rm -rf /var/lib/apt/lists/*
WORKDIR /app
# Pre-cache the application dependencies.

15
README.md
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@@ -392,11 +392,24 @@ This will enable trace visualization in LangGraph Studio and send your traces to
3. Supports saving and loading checkpoints for workflow execution.
4. Supports saving chat stream events for replaying conversations.
Note:
*Note: About langgraph issue #5557*
The latest langgraph-checkpoint-postgres-2.0.23 have checkpointing issue, you can check the open issue:"TypeError: Object of type HumanMessage is not JSON serializable" [https://github.com/langchain-ai/langgraph/issues/5557].
To use postgres checkpoint you should install langgraph-checkpoint-postgres-2.0.21
*Note: About psycopg dependencies*
Please read the following document before using postgres: https://www.psycopg.org/psycopg3/docs/basic/install.html
BY default, psycopg needs libpq to be installed on your system. If you don't have libpq installed, you can install psycopg with the `binary` extra to include a statically linked version of libpq mannually:
```bash
pip install psycopg[binary]
```
This will install a self-contained package with all the libraries needed, but binary not supported for all platform, you check the supported platform : https://pypi.org/project/psycopg-binary/#files
if not supported, you can select local-installation: https://www.psycopg.org/psycopg3/docs/basic/install.html#local-installation
The default database and collection will be automatically created if not exists.
Default database: checkpoing_db
Default collection: checkpoint_writes_aio (langgraph checkpoint writes)