SF functions fetch example

docs/learn/rossum-formulas/serverless-functions.md

@@ -353,5 +353,51 @@ The config examples are numbered for easier orientation:
   ]
 }
 ```
-
 </details>
+
+## Fetch OCR Text (page_data)
+
+This function retrieves textual data from Rossum's page_data API for an annotation and processes it to:
+
+1. Fetch OCR document content Data: Make an HTTP GET request to the page_data endpoint of a specific annotation using the provided rossum_authorization_token.
+1. Retry Mechanism: Handle transient network or server issues by retrying up to 3 times in case of a non-200 HTTP response or exceptions.
+1. Process Text Content: Iterate through the fetched text content for custom manipulations or pattern analysis.
+
+```py
+import requests
+
+
+def get_ocr_document_content(payload):
+    """
+    Fetch page_data from annotation.
+    :param payload: Dictionary containing the payload with annotation information.
+    """
+    token = payload.get("rossum_authorization_token")
+    annotation_url = payload.get("annotation", {}).get("url")
+
+    retries = 3
+    for attempt in range(retries):
+        try:
+            # Request to fetch text content from annotation
+            page_req = requests.get(
+                url=f"{annotation_url}/page_data?granularity=texts",
+                headers={"Authorization": f"Bearer {token}"}
+            )
+
+            if page_req.status_code == 200:
+                results = page_req.json().get("results", [])
+                # This part is optional iteration through all the text nodes
+                for page in results:
+                    for item in page.get("items", []):
+                        ocr_text = item.get("text", "")
+                        if ocr_text:
+                            # Here will be any kind of manipulation with the text you need to do.
+                            print(ocr_text)
+
+                break  # Exit retry loop if request is successful
+            else:
+                print(f"Attempt {attempt + 1} failed with status code {page_req.status_code}. Retrying...")
+
+        except requests.RequestException as e:
+            print(f"Attempt {attempt + 1} encountered an exception: {e}. Retrying...")
+```