Add streaming support to Anthropic provider and implement generate_stream_text method

simplemind/providers/anthropic.py

@@ -24,6 +24,7 @@ class Anthropic(BaseProvider):
     NAME = PROVIDER_NAME
     DEFAULT_MODEL = DEFAULT_MODEL
     DEFAULT_KWARGS = DEFAULT_KWARGS
+    supports_streaming = True
 
     def __init__(self, api_key: str | None = None):
         self.api_key = api_key or settings.get_api_key(PROVIDER_NAME)
@@ -107,3 +108,20 @@ class Anthropic(BaseProvider):
         )
 
         return response.content[0].text
+
+    @logger
+    def generate_stream_text(self, prompt: str, *, llm_model: str, **kwargs):
+        # Prepare the messages.
+        messages = [
+            {"role": "user", "content": prompt},
+        ]
+
+        # Make the request.
+        with self.client.messages.stream(
+            model=llm_model or self.DEFAULT_MODEL,
+            messages=messages,
+            **{**self.DEFAULT_KWARGS, **kwargs},
+        ) as stream:
+            # Yield each chunk of text from the stream.
+            for chunk in stream.text_stream:
+                yield chunk