Add retry logic to metadata fetch, don't crash on 500

src/main.rs

@@ -304,26 +304,13 @@ pub async fn main() -> Result<()> {
                                 continue;
                             }
                         } else {
-                            warn!("file has no metadata link");
+                            warn!("file has no metadata link, continuing with download");
                         }
-                        Ok(())
                     }
                     Err(err) => {
-                        if let Some(reqwest_err) = err.downcast_ref::<reqwest::Error>() {
-                            if reqwest_err.status() == Some(StatusCode::NOT_FOUND) {
-                                warn!(
-                                    status = ?reqwest_err.status(),
-                                    "metadata for file not found on server"
-                                );
-                                Ok(())
-                            } else {
-                                Err(err)
+                        warn!(error = %err, "error retreiving metadata for file, continuing with download");
                     }
-                        } else {
-                            Err(err)
-                        }
-                    }
-                }?;
+                };
 
                 let download_link_resp =
                     nexus_api::download_link::get(&client, db_mod.nexus_mod_id, api_file.file_id)

src/nexus_api/metadata.rs

@@ -2,7 +2,8 @@ use anyhow::{anyhow, Result};
 use reqwest::Client;
 use serde_json::Value;
 use std::env;
-use tracing::{info, instrument};
+use tokio::time::sleep;
+use tracing::{info, instrument, warn};
 
 use super::files::ApiFile;
 use super::USER_AGENT;
@@ -44,21 +45,30 @@ fn has_plugin(json: &Value) -> Result<bool> {
 
 #[instrument(skip(client, api_file), fields(metadata_link = api_file.content_preview_link.unwrap_or("null")))]
 pub async fn contains_plugin(client: &Client, api_file: &ApiFile<'_>) -> Result<Option<bool>> {
+    for attempt in 1..=3 {
         if let Some(metadata_link) = api_file.content_preview_link {
-        let res = client
+            let res = match client
                 .get(metadata_link)
                 .header("accept", "application/json")
                 .header("apikey", env::var("NEXUS_API_KEY")?)
                 .header("user-agent", USER_AGENT)
                 .send()
                 .await?
-            .error_for_status()?;
+                .error_for_status()
+            {
+                Ok(res) => res,
+                Err(err) => {
+                    warn!(error = %err, attempt, "Failed to get metadata for file, trying again after 1 second");
+                    sleep(std::time::Duration::from_secs(1)).await;
+                    continue;
+                }
+            };
 
             info!(status = %res.status(), "fetched file metadata from API");
             let json = res.json::<Value>().await?;
 
             match json.get("children") {
-            None => Ok(Some(false)),
+                None => return Ok(Some(false)),
                 Some(children) => {
                     let children = children
                         .as_array()
@@ -68,10 +78,12 @@ pub async fn contains_plugin(client: &Client, api_file: &ApiFile<'_>) -> Result<
                             return Ok(Some(true));
                         }
                     }
-                Ok(Some(false))
+                    return Ok(Some(false));
                 }
             }
         } else {
-        Ok(None)
+            return Ok(None);
         }
     }
+    Err(anyhow!("Failed to get metadata for file in three attempts"))
+}