feat: RAG Integration (#238)

* feat: add rag provider and retriever

* feat: retriever tool

* feat: add retriever tool to the researcher node

* feat: add rag http apis

* feat: new message input supports resource mentions

* feat: new message input component support resource mentions

* refactor: need_web_search to need_search

* chore: RAG integration docs

* chore: change example api host

* fix: user message color in dark mode

* fix: mentions style

* feat: add local_search_tool to researcher prompt

* chore: research prompt

* fix: ragflow page size and reporter with

* docs: ragflow integration and add acknowledgment projects

* chore: format

src/rag/ragflow.py

@@ -0,0 +1,130 @@
+import os
+import requests
+from src.rag.retriever import Chunk, Document, Resource, Retriever
+from urllib.parse import urlparse
+
+
+class RAGFlowProvider(Retriever):
+    """
+    RAGFlowProvider is a provider that uses RAGFlow to retrieve documents.
+    """
+
+    api_url: str
+    api_key: str
+    page_size: int = 10
+
+    def __init__(self):
+        api_url = os.getenv("RAGFLOW_API_URL")
+        if not api_url:
+            raise ValueError("RAGFLOW_API_URL is not set")
+        self.api_url = api_url
+
+        api_key = os.getenv("RAGFLOW_API_KEY")
+        if not api_key:
+            raise ValueError("RAGFLOW_API_KEY is not set")
+        self.api_key = api_key
+
+        page_size = os.getenv("RAGFLOW_PAGE_SIZE")
+        if page_size:
+            self.page_size = int(page_size)
+
+    def query_relevant_documents(
+        self, query: str, resources: list[Resource] = []
+    ) -> list[Document]:
+        headers = {
+            "Authorization": f"Bearer {self.api_key}",
+            "Content-Type": "application/json",
+        }
+
+        dataset_ids: list[str] = []
+        document_ids: list[str] = []
+
+        for resource in resources:
+            dataset_id, document_id = parse_uri(resource.uri)
+            dataset_ids.append(dataset_id)
+            if document_id:
+                document_ids.append(document_id)
+
+        payload = {
+            "question": query,
+            "dataset_ids": dataset_ids,
+            "document_ids": document_ids,
+            "page_size": self.page_size,
+        }
+
+        response = requests.post(
+            f"{self.api_url}/api/v1/retrieval", headers=headers, json=payload
+        )
+
+        if response.status_code != 200:
+            raise Exception(f"Failed to query documents: {response.text}")
+
+        result = response.json()
+        data = result.get("data", {})
+        doc_aggs = data.get("doc_aggs", [])
+        docs: dict[str, Document] = {
+            doc.get("doc_id"): Document(
+                id=doc.get("doc_id"),
+                title=doc.get("doc_name"),
+                chunks=[],
+            )
+            for doc in doc_aggs
+        }
+
+        for chunk in data.get("chunks", []):
+            doc = docs.get(chunk.get("document_id"))
+            if doc:
+                doc.chunks.append(
+                    Chunk(
+                        content=chunk.get("content"),
+                        similarity=chunk.get("similarity"),
+                    )
+                )
+
+        return list(docs.values())
+
+    def list_resources(self, query: str | None = None) -> list[Resource]:
+        headers = {
+            "Authorization": f"Bearer {self.api_key}",
+            "Content-Type": "application/json",
+        }
+
+        params = {}
+        if query:
+            params["name"] = query
+
+        response = requests.get(
+            f"{self.api_url}/api/v1/datasets", headers=headers, params=params
+        )
+
+        if response.status_code != 200:
+            raise Exception(f"Failed to list resources: {response.text}")
+
+        result = response.json()
+        resources = []
+
+        for item in result.get("data", []):
+            item = Resource(
+                uri=f"rag://dataset/{item.get('id')}",
+                title=item.get("name", ""),
+                description=item.get("description", ""),
+            )
+            resources.append(item)
+
+        return resources
+
+
+def parse_uri(uri: str) -> tuple[str, str]:
+    parsed = urlparse(uri)
+    if parsed.scheme != "rag":
+        raise ValueError(f"Invalid URI: {uri}")
+    return parsed.path.split("/")[1], parsed.fragment
+
+
+if __name__ == "__main__":
+    uri = "rag://dataset/123#abc"
+    parsed = urlparse(uri)
+    print(parsed.scheme)
+    print(parsed.netloc)
+    print(parsed.path)
+    print(parsed.fragment)