Curate sources to avoid the UI crashing (#1212)

* Curate sources to avoid the UI crashing

* Remove sources from chat history to avoid confusing the LLM

private_gpt/ui/ui.py

@@ -9,18 +9,43 @@
 from fastapi import FastAPI
 from gradio.themes.utils.colors import slate  # type: ignore
 from llama_index.llms import ChatMessage, ChatResponse, MessageRole
+from pydantic import BaseModel
 
 from private_gpt.di import root_injector
 from private_gpt.server.chat.chat_service import ChatService, CompletionGen
-from private_gpt.server.chunks.chunks_service import ChunksService
+from private_gpt.server.chunks.chunks_service import Chunk, ChunksService
 from private_gpt.server.ingest.ingest_service import IngestService
 from private_gpt.settings.settings import settings
 from private_gpt.ui.images import logo_svg
 
 logger = logging.getLogger(__name__)
 
-
 UI_TAB_TITLE = "My Private GPT"
+SOURCES_SEPARATOR = "\n\n Sources: \n"
+
+
+class Source(BaseModel):
+    file: str
+    page: str
+    text: str
+
+    class Config:
+        frozen = True
+
+    @staticmethod
+    def curate_sources(sources: list[Chunk]) -> set["Source"]:
+        curated_sources = set()
+
+        for chunk in sources:
+            doc_metadata = chunk.document.doc_metadata
+
+            file_name = doc_metadata.get("file_name", "-") if doc_metadata else "-"
+            page_label = doc_metadata.get("page_label", "-") if doc_metadata else "-"
+
+            source = Source(file=file_name, page=page_label, text=chunk.text)
+            curated_sources.add(source)
+
+        return curated_sources
 
 
 class PrivateGptUi:
@@ -44,21 +69,11 @@ def yield_deltas(completion_gen: CompletionGen) -> Iterable[str]:
                 yield full_response
 
             if completion_gen.sources:
-                full_response += "\n\n Sources: \n"
-                sources = (
-                    {
-                        "file": chunk.document.doc_metadata["file_name"]
-                        if chunk.document.doc_metadata
-                        else "",
-                        "page": chunk.document.doc_metadata["page_label"]
-                        if chunk.document.doc_metadata
-                        else "",
-                    }
-                    for chunk in completion_gen.sources
-                )
+                full_response += SOURCES_SEPARATOR
+                cur_sources = Source.curate_sources(completion_gen.sources)
                 sources_text = "\n\n\n".join(
-                    f"{index}. {source['file']} (page {source['page']})"
-                    for index, source in enumerate(sources, start=1)
+                    f"{index}. {source.file} (page {source.page})"
+                    for index, source in enumerate(cur_sources, start=1)
                 )
                 full_response += sources_text
             yield full_response
@@ -70,7 +85,9 @@ def build_history() -> list[ChatMessage]:
                         [
                             ChatMessage(content=interaction[0], role=MessageRole.USER),
                             ChatMessage(
-                                content=interaction[1], role=MessageRole.ASSISTANT
+                                # Remove from history content the Sources information
+                                content=interaction[1].split(SOURCES_SEPARATOR)[0],
+                                role=MessageRole.ASSISTANT,
                             ),
                         ]
                         for interaction in history
@@ -103,11 +120,13 @@ def build_history() -> list[ChatMessage]:
                     text=message, limit=4, prev_next_chunks=0
                 )
 
+                sources = Source.curate_sources(response)
+
                 yield "\n\n\n".join(
-                    f"{index}. **{chunk.document.doc_metadata['file_name'] if chunk.document.doc_metadata else ''} "
-                    f"(page {chunk.document.doc_metadata['page_label'] if chunk.document.doc_metadata else ''})**\n "
-                    f"{chunk.text}"
-                    for index, chunk in enumerate(response, start=1)
+                    f"{index}. **{source.file} "
+                    f"(page {source.page})**\n "
+                    f"{source.text}"
+                    for index, source in enumerate(sources, start=1)
                 )
 
     def _list_ingested_files(self) -> list[list[str]]: