added secrets file for openai key

.streamlit/secrets.toml

@@ -0,0 +1 @@
+OPENAI_API_KEY = "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"

app.py

@@ -12,11 +12,11 @@ from langchain_core.prompts import ChatPromptTemplate
 
 from langchain_community.document_loaders import UnstructuredFileLoader
 
-import os
-os.environ["OPENAI_API_KEY"] = "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"
+OPENAI_API_KEY = st.secrets["OPENAI_API_KEY"]
 
 # Get all the filenames from the docs folder
 files = glob.glob("./docs/*.txt")
+
 # Load files into readable documents
 docs = []
 for file in files:
@@ -68,7 +68,7 @@ rag_chain = (
     | StrOutputParser()
 )
 
-st.title("💬 Volker-Chat")
+st.title("🐔 Volker-Chat")
 
 if "messages" not in st.session_state:
     st.session_state["messages"] = [{"role": "assistant", "content": "Ahoi! Ich bin Volker. Wie kann ich dir helfen?"}]
@@ -78,5 +78,7 @@ for msg in st.session_state.messages:
 
 if prompt := st.chat_input():
     st.chat_message("user").write(prompt)
-    response = rag_chain.invoke(prompt)
-    st.chat_message("assistant").write(response)
+    with get_openai_callback() as cb:
+        response = rag_chain.invoke(prompt)
+        st.chat_message("assistant").write(response)
+        st.chat_message("assistant").write(cb)