feat(agent): Multi agents v0.1 (#1044)

Co-authored-by: qidanrui <qidanrui@gmail.com>
Co-authored-by: csunny <cfqsunny@163.com>
Co-authored-by: Fangyin Cheng <staneyffer@gmail.com>

dbgpt/serve/agent/team/base.py

@@ -0,0 +1,58 @@
+import logging
+from enum import Enum
+from typing import List, Union
+
+logger = logging.getLogger(__name__)
+
+
+class TeamMode(Enum):
+    AUTO_PLAN = "auto_plan"
+    AWEL_LAYOUT = "awel_layout"
+    SINGLE_AGENT = "singe_agent"
+
+
+def content_str(content: Union[str, List, None]) -> str:
+    """Converts `content` into a string format.
+
+    This function processes content that may be a string, a list of mixed text and image URLs, or None,
+    and converts it into a string. Text is directly appended to the result string, while image URLs are
+    represented by a placeholder image token. If the content is None, an empty string is returned.
+
+    Args:
+        - content (Union[str, List, None]): The content to be processed. Can be a string, a list of dictionaries
+                                      representing text and image URLs, or None.
+
+    Returns:
+        str: A string representation of the input content. Image URLs are replaced with an image token.
+
+    Note:
+    - The function expects each dictionary in the list to have a "type" key that is either "text" or "image_url".
+      For "text" type, the "text" key's value is appended to the result. For "image_url", an image token is appended.
+    - This function is useful for handling content that may include both text and image references, especially
+      in contexts where images need to be represented as placeholders.
+    """
+    if content is None:
+        return ""
+    if isinstance(content, str):
+        return content
+    if not isinstance(content, list):
+        raise TypeError(f"content must be None, str, or list, but got {type(content)}")
+
+    rst = ""
+    for item in content:
+        if not isinstance(item, dict):
+            raise TypeError(
+                "Wrong content format: every element should be dict if the content is a list."
+            )
+        assert (
+            "type" in item
+        ), "Wrong content format. Missing 'type' key in content's dict."
+        if item["type"] == "text":
+            rst += item["text"]
+        elif item["type"] == "image_url":
+            rst += "<image>"
+        else:
+            raise ValueError(
+                f"Wrong content format: unknown type {item['type']} within the content"
+            )
+    return rst