Confluence DL retry/backoff (#3168)

Implemented a retry/backoff logic in response to #2473

---------

Co-authored-by: Justin Flick <jflick@homesite.com>

langchain/document_loaders/confluence.py

@@ -1,9 +1,19 @@
 """Load Data from a Confluence Space"""
+import logging
 from typing import Any, Callable, List, Optional, Union
 
+from tenacity import (
+    before_sleep_log,
+    retry,
+    stop_after_attempt,
+    wait_exponential,
+)
+
 from langchain.docstore.document import Document
 from langchain.document_loaders.base import BaseLoader
 
+logger = logging.getLogger(__name__)
+
 
 class ConfluenceLoader(BaseLoader):
     """
@@ -44,8 +54,14 @@ class ConfluenceLoader(BaseLoader):
     :type oauth2: dict, optional
     :param cloud: _description_, defaults to True
     :type cloud: bool, optional
-    :raises ValueError: _description_
-    :raises ImportError: _description_
+    :param number_of_retries: How many times to retry, defaults to 3
+    :type number_of_retries: Optional[int], optional
+    :param min_retry_seconds: defaults to 2
+    :type min_retry_seconds: Optional[int], optional
+    :param max_retry_seconds:  defaults to 10
+    :type max_retry_seconds: Optional[int], optional
+    :raises ValueError: Errors while validating input
+    :raises ImportError: Required dependencies not installed.
     """
 
     def __init__(
@@ -54,13 +70,19 @@ class ConfluenceLoader(BaseLoader):
         api_key: Optional[str] = None,
         username: Optional[str] = None,
         oauth2: Optional[dict] = None,
-        cloud: bool = True,
+        cloud: Optional[bool] = True,
+        number_of_retries: Optional[int] = 3,
+        min_retry_seconds: Optional[int] = 2,
+        max_retry_seconds: Optional[int] = 10,
     ):
         errors = ConfluenceLoader.validate_init_args(url, api_key, username, oauth2)
         if errors:
             raise ValueError(f"Error(s) while validating input: {errors}")
 
         self.base_url = url
+        self.number_of_retries = number_of_retries
+        self.min_retry_seconds = min_retry_seconds
+        self.max_retry_seconds = max_retry_seconds
 
         try:
             from atlassian import Confluence  # noqa: F401
@@ -196,9 +218,19 @@ class ConfluenceLoader(BaseLoader):
 
         if page_ids:
             for page_id in page_ids:
-                page = self.confluence.get_page_by_id(
-                    page_id=page_id, expand="body.storage.value"
-                )
+                get_page = retry(
+                    reraise=True,
+                    stop=stop_after_attempt(
+                        self.number_of_retries  # type: ignore[arg-type]
+                    ),
+                    wait=wait_exponential(
+                        multiplier=1,  # type: ignore[arg-type]
+                        min=self.min_retry_seconds,  # type: ignore[arg-type]
+                        max=self.max_retry_seconds,  # type: ignore[arg-type]
+                    ),
+                    before_sleep=before_sleep_log(logger, logging.WARNING),
+                )(self.confluence.get_page_by_id)
+                page = get_page(page_id=page_id, expand="body.storage.value")
                 doc = self.process_page(page, include_attachments, text_maker)
                 docs.append(doc)
 
@@ -227,7 +259,19 @@ class ConfluenceLoader(BaseLoader):
         page = 0
         docs = []
         while page < limit:
-            batch = retrieval_method(**kwargs, start=page)
+            get_pages = retry(
+                reraise=True,
+                stop=stop_after_attempt(
+                    self.number_of_retries  # type: ignore[arg-type]
+                ),
+                wait=wait_exponential(
+                    multiplier=1,
+                    min=self.min_retry_seconds,  # type: ignore[arg-type]
+                    max=self.max_retry_seconds,  # type: ignore[arg-type]
+                ),
+                before_sleep=before_sleep_log(logger, logging.WARNING),
+            )(retrieval_method)
+            batch = get_pages(**kwargs, start=page)
             if len(batch) < limit:
                 page = limit
             else: