Refactor: migrate pdf_parser.py to golang (#16323)

### What problem does this PR solve?

Http API based on onnx model.
pdf_parser.py to golang

### Type of change

- [x] Refactoring

docker/.env

@@ -25,7 +25,7 @@ DOC_ENGINE=${DOC_ENGINE:-elasticsearch}
 # - `gpu`
 DEVICE=${DEVICE:-cpu}
 
-COMPOSE_PROFILES=${DOC_ENGINE},${DEVICE}
+COMPOSE_PROFILES=${DOC_ENGINE},${DEVICE},deepdoc
 
 # The version of Elasticsearch.
 STACK_VERSION=${STACK_VERSION:-8.11.3}
@@ -308,3 +308,13 @@ THREAD_POOL_MAX_WORKERS=128
 
 #Option to disable login form for SSO
 DISABLE_PASSWORD_LOGIN=false
+
+# -----------------------------------------------------------------------------
+# DeepDoc OSS Vision Service
+# -----------------------------------------------------------------------------
+# URL for the deepdoc vision API (DLA, OCR, TSR) served by OSS ONNX models.
+# The `deepdoc` service defined in docker-compose.yml provides this endpoint.
+# When unset, the parser falls back to inline ONNX Runtime inference.
+DEEPDOC_URL=http://deepdoc:9390
+# Docker image for the OSS deepdoc service.  CPU-only; uses ONNX Runtime.
+DEEPDOC_IMAGE=deepdoc_oss:latest

docker/README.md

@@ -89,6 +89,17 @@ The [.env](./.env) file contains important environment variables for Docker.
 >   - `RAGFLOW_IMAGE=swr.cn-north-4.myhuaweicloud.com/infiniflow/ragflow:nightly` or,
 >   - `RAGFLOW_IMAGE=registry.cn-hangzhou.aliyuncs.com/infiniflow/ragflow:nightly`.
 
+### DeepDoc Vision Service (OSS)
+
+- `DEEPDOC_URL`  
+  URL for the deepdoc vision API serving DLA (layout analysis), OCR (text detection/recognition), and TSR (table structure recognition). The `deepdoc` service in `docker-compose.yml` provides this endpoint. Defaults to `http://deepdoc:9390`. When unset, the parser falls back to inline ONNX Runtime inference.
+
+  > The OSS deepdoc service runs on CPU using ONNX Runtime models. No GPU required.  
+  > API endpoints: `GET /health`, `GET /model`, `POST /predict/dla`, `POST /predict/tsr`, `POST /predict/ocr`.
+
+- `DEEPDOC_IMAGE`  
+  Docker image for the OSS deepdoc service. Defaults to `infiniflow/deepdoc_oss:latest`.
+
 ### Timezone
 
 - `TZ`  
@@ -167,6 +178,13 @@ Before setting `DOC_ENGINE=oceanbase`, make sure the host OS allows the file des
   - `host`: The API server's IP address inside the Docker container. Defaults to `0.0.0.0`.
   - `port`: The API server's serving port inside the Docker container. Defaults to `9380`.
 
+- `deepdoc`  
+  The OSS DeepDoc vision service provides DLA, OCR, and TSR inference via ONNX Runtime.
+  Defined in `docker-compose.yml`, it is started automatically as a dependency of `ragflow-cpu` and `ragflow-gpu`.
+  - `image`: Docker image. Defaults to `infiniflow/deepdoc_oss:latest`.
+  - `port`: Serving port inside the container. Defaults to `9390`.
+  - Health check: `curl -f http://localhost:9390/health` every 10s.
+
 - `mysql`
   - `name`: The MySQL database name. Defaults to `rag_flow`.
   - `user`: The username for MySQL.

docker/docker-compose.yml

@@ -2,10 +2,28 @@ include:
   - ./docker-compose-base.yml
 # To ensure that the container processes the locally modified `service_conf.yaml.template` instead of the one included in its image, you need to mount the local `service_conf.yaml.template` to the container.
 services:
+  deepdoc:
+    image: ${DEEPDOC_IMAGE:-deepdoc_oss:latest}
+    profiles:
+      - deepdoc
+    build:
+      context: ..
+      dockerfile: Dockerfile_deepdoc_oss
+    networks:
+      - ragflow
+    restart: unless-stopped
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:9390/health"]
+      interval: 10s
+      timeout: 10s
+      retries: 60
+
   ragflow-cpu:
     depends_on:
       mysql:
         condition: service_healthy
+      deepdoc:
+        condition: service_healthy
     profiles:
       - cpu
     image: ${RAGFLOW_IMAGE}
@@ -57,6 +75,8 @@ services:
     depends_on:
       mysql:
         condition: service_healthy
+      deepdoc:
+        condition: service_healthy
     profiles:
       - gpu
     image: ${RAGFLOW_IMAGE}