fix(aws_s3 source): add retry delay in sqs::Ingestor

This commit adds logic to wait 500ms between subsequent calls of
run_once if it returns an error. This is required to prevent spamming
the SQS API if it fails to receive messages, e.g. due to invalid IAM
permissions or an SQS outage.

Author: medzin

src/sources/aws_s3/sqs.rs

@@ -1,4 +1,5 @@
 use std::collections::HashMap;
+use std::time::Duration;
 use std::{future::ready, num::NonZeroUsize, panic, sync::Arc, sync::LazyLock};
 
 use aws_sdk_s3::operation::get_object::GetObjectError;
@@ -401,27 +402,37 @@ impl IngestorProcess {
     async fn run(mut self) {
         let shutdown = self.shutdown.clone().fuse();
         pin!(shutdown);
+        let delay = Duration::from_millis(500);
 
         loop {
             select! {
                 _ = &mut shutdown => break,
-                _ = self.run_once() => {},
+                result = self.run_once() => {
+                    match result {
+                        Ok(()) => {}
+                        Err(_) => {
+                            trace!("run_once failed, will retry after delay");
+                            tokio::time::sleep(delay).await;
+                        }
+                    }
+                },
             }
         }
     }
 
-    async fn run_once(&mut self) {
-        let messages = self.receive_messages().await;
-        let messages = messages
-            .inspect(|messages| {
+    async fn run_once(&mut self) -> Result<(), ()> {
+        let messages = match self.receive_messages().await {
+            Ok(messages) => {
                 emit!(SqsMessageReceiveSucceeded {
                     count: messages.len(),
                 });
-            })
-            .inspect_err(|err| {
-                emit!(SqsMessageReceiveError { error: err });
-            })
-            .unwrap_or_default();
+                messages
+            }
+            Err(err) => {
+                emit!(SqsMessageReceiveError { error: &err });
+                return Err(());
+            }
+        };
 
         let mut delete_entries = Vec::new();
         let mut deferred_entries = Vec::new();
@@ -517,7 +528,7 @@ impl IngestorProcess {
                     message = "Deferred queue not configured, but received deferred entries.",
                     internal_log_rate_limit = true
                 );
-                return;
+                return Ok(());
             };
             let cloned_entries = deferred_entries.clone();
             match self
@@ -572,6 +583,7 @@ impl IngestorProcess {
                 }
             }
         }
+        Ok(())
     }
 
     async fn handle_sqs_message(&mut self, message: Message) -> Result<(), ProcessingError> {