feat: all CLI-based errors now come out in the same JSON format to further improve scripting and LLM integration

src/network/mod.rs

@@ -1,4 +1,5 @@
-use std::fmt::Debug;
+use std::error::Error;
+use std::fmt::{self, Debug};
 use std::sync::{Arc, OnceLock};
 
 use anyhow::{Result, anyhow};
@@ -156,8 +157,22 @@ impl<'a, 'b> Network<'a, 'b> {
               let error_body = format_error_body(&response_body);
 
               error!("Request failed. Received {status} response code with body: {response_body}");
-              self.app.lock().await.handle_error(anyhow!("Request failed. Received {status} response code with body: {error_body}"));
-              Err(anyhow!("Request failed. Received {status} response code with body: {error_body}"))
+              let message = format!("Request failed. Received {status} response code with body: {error_body}");
+              let body = if response_body.is_empty() {
+                None
+              } else {
+                Some(
+                  serde_json::from_str::<Value>(&response_body)
+                    .unwrap_or(Value::String(response_body)),
+                )
+              };
+              let network_error = NetworkError {
+                message,
+                status: status.as_u16(),
+                body,
+              };
+              self.app.lock().await.handle_error(network_error.clone().into());
+              Err(network_error.into())
             }
           }
           Err(e) => {
@@ -304,6 +319,21 @@ fn format_error_body(response_body: &str) -> String {
   re.replace_all(&body, " ").to_string()
 }
 
+#[derive(Clone, Debug)]
+pub struct NetworkError {
+  pub message: String,
+  pub status: u16,
+  pub body: Option<Value>,
+}
+
+impl fmt::Display for NetworkError {
+  fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+    write!(f, "{}", self.message)
+  }
+}
+
+impl Error for NetworkError {}
+
 #[derive(Clone, Copy, Debug, Display, PartialEq, Eq)]
 pub enum RequestMethod {
   Get,

src/network/network_tests.rs

@@ -10,7 +10,7 @@ mod tests {
   use reqwest::header::HeaderMap;
   use rstest::rstest;
   use serde::{Deserialize, Serialize};
-  use serde_json::json;
+  use serde_json::{Value, json};
   use tokio::sync::{Mutex, mpsc};
   use tokio_util::sync::CancellationToken;
 
@@ -22,7 +22,9 @@ mod tests {
   use crate::network::network_tests::test_utils::test_network;
   use crate::network::radarr_network::RadarrEvent;
   use crate::network::sonarr_network::SonarrEvent;
-  use crate::network::{Network, NetworkEvent, NetworkTrait, RequestMethod, RequestProps};
+  use crate::network::{
+    Network, NetworkError, NetworkEvent, NetworkTrait, RequestMethod, RequestProps,
+  };
 
   #[tokio::test]
   async fn test_handle_network_event_radarr_event() {
@@ -398,6 +400,104 @@ mod tests {
     );
   }
 
+  #[tokio::test]
+  async fn test_handle_request_non_success_code_downcasts_to_network_error_with_json_body() {
+    let (async_server, app_arc, server) = mock_api(RequestMethod::Get, 404, true).await;
+    let mut network = test_network(&app_arc);
+
+    let resp = network
+      .handle_request::<(), Test>(
+        RequestProps {
+          uri: format!("{}/test", server.url()),
+          method: RequestMethod::Get,
+          body: None,
+          api_token: "test1234".to_owned(),
+          ignore_status_code: false,
+          custom_headers: HeaderMap::new(),
+        },
+        |_, _| (),
+      )
+      .await;
+
+    async_server.assert_async().await;
+    let network_error = resp.unwrap_err().downcast::<NetworkError>().unwrap();
+    assert_str_eq!(
+      network_error.message,
+      r#"Request failed. Received 404 Not Found response code with body: { "value": "Test" }"#
+    );
+    assert_eq!(network_error.status, 404);
+    assert_some_eq_x!(network_error.body.as_ref(), &json!({ "value": "Test" }));
+  }
+
+  #[tokio::test]
+  async fn test_handle_request_non_success_code_downcasts_to_network_error_with_string_body() {
+    let mut server = Server::new_async().await;
+    let async_server = server
+      .mock("GET", "/test")
+      .match_header("X-Api-Key", "test1234")
+      .with_status(503)
+      .with_body("Service Unavailable")
+      .create_async()
+      .await;
+    let app_arc = Arc::new(Mutex::new(App::test_default()));
+    let mut network = test_network(&app_arc);
+
+    let resp = network
+      .handle_request::<(), Test>(
+        RequestProps {
+          uri: format!("{}/test", server.url()),
+          method: RequestMethod::Get,
+          body: None,
+          api_token: "test1234".to_owned(),
+          ignore_status_code: false,
+          custom_headers: HeaderMap::new(),
+        },
+        |_, _| (),
+      )
+      .await;
+
+    async_server.assert_async().await;
+    let network_error = resp.unwrap_err().downcast::<NetworkError>().unwrap();
+    assert_str_eq!(
+      network_error.message,
+      "Request failed. Received 503 Service Unavailable response code with body: Service Unavailable"
+    );
+    assert_eq!(network_error.status, 503);
+    assert_some_eq_x!(
+      network_error.body.as_ref(),
+      &Value::String("Service Unavailable".to_owned())
+    );
+  }
+
+  #[tokio::test]
+  async fn test_handle_request_non_success_code_downcasts_to_network_error_with_empty_body() {
+    let (async_server, app_arc, server) = mock_api(RequestMethod::Post, 404, false).await;
+    let mut network = test_network(&app_arc);
+
+    let resp = network
+      .handle_request::<(), Test>(
+        RequestProps {
+          uri: format!("{}/test", server.url()),
+          method: RequestMethod::Post,
+          body: None,
+          api_token: "test1234".to_owned(),
+          ignore_status_code: false,
+          custom_headers: HeaderMap::new(),
+        },
+        |_, _| (),
+      )
+      .await;
+
+    async_server.assert_async().await;
+    let network_error = resp.unwrap_err().downcast::<NetworkError>().unwrap();
+    assert_str_eq!(
+      network_error.message,
+      r#"Request failed. Received 404 Not Found response code with body: "#
+    );
+    assert_eq!(network_error.status, 404);
+    assert_none!(network_error.body);
+  }
+
   #[rstest]
   #[tokio::test]
   async fn test_call_api(

src/utils.rs

@@ -6,7 +6,7 @@ use std::sync::Arc;
 use std::time::Duration;
 
 use anyhow::Result;
-use anyhow::{Context, anyhow};
+use anyhow::{Context, Error, anyhow};
 use colored::Colorize;
 use indicatif::{ProgressBar, ProgressStyle};
 use log::{LevelFilter, error};
@@ -18,13 +18,15 @@ use log4rs::config::{Appender, Root};
 use log4rs::encode::pattern::PatternEncoder;
 use regex::Regex;
 use reqwest::{Certificate, Client};
+use serde::Serialize;
+use serde_json::Value;
 use tokio::sync::Mutex;
 use tokio_util::sync::CancellationToken;
 
 use crate::app::{App, AppConfig, log_and_print_error};
 use crate::cli::{self, Command};
 use crate::models::Route;
-use crate::network::Network;
+use crate::network::{Network, NetworkError};
 use crate::ui::theme::ThemeDefinitionsWrapper;
 
 #[cfg(test)]
@@ -282,6 +284,36 @@ pub(super) fn render_spinner() -> ProgressBar {
   pb
 }
 
+#[derive(Serialize)]
+struct CliError<'a> {
+  error: CliErrorDetails<'a>,
+}
+
+#[derive(Serialize)]
+struct CliErrorDetails<'a> {
+  message: String,
+  status: Option<u16>,
+  body: Option<&'a Value>,
+}
+
+fn format_cli_error(error: &Error) -> String {
+  let details = match error.downcast_ref::<NetworkError>() {
+    Some(network_error) => CliErrorDetails {
+      message: network_error.message.clone(),
+      status: Some(network_error.status),
+      body: network_error.body.as_ref(),
+    },
+    None => CliErrorDetails {
+      message: error.to_string(),
+      status: None,
+      body: None,
+    },
+  };
+
+  serde_json::to_string_pretty(&CliError { error: details })
+    .expect("CLI error details are infallibly serializable")
+}
+
 pub(super) async fn start_cli_with_spinner(
   config: AppConfig,
   reqwest_client: Client,
@@ -295,7 +327,8 @@ pub(super) async fn start_cli_with_spinner(
     let mut app = app.lock().await;
     app.cli_mode = true;
     select_cli_configuration(&mut app, &config, &command, servarr_name).unwrap_or_else(|error| {
-      log_and_print_error(error.to_string());
+      error!("{error}");
+      eprintln!("{}", format_cli_error(&error));
       process::exit(1);
     });
   }
@@ -309,7 +342,7 @@ pub(super) async fn start_cli_with_spinner(
     }
     Err(e) => {
       pb.finish();
-      eprintln!("error: {}", e.to_string().red());
+      eprintln!("{}", format_cli_error(&e));
       process::exit(1);
     }
   }
@@ -328,7 +361,8 @@ pub(super) async fn start_cli_no_spinner(
     let mut app = app.lock().await;
     app.cli_mode = true;
     select_cli_configuration(&mut app, &config, &command, servarr_name).unwrap_or_else(|error| {
-      log_and_print_error(error.to_string());
+      error!("{error}");
+      eprintln!("{}", format_cli_error(&error));
       process::exit(1);
     });
   }
@@ -339,7 +373,7 @@ pub(super) async fn start_cli_no_spinner(
       println!("{output}");
     }
     Err(e) => {
-      eprintln!("error: {}", e.to_string().red());
+      eprintln!("{}", format_cli_error(&e));
       process::exit(1);
     }
   }
@@ -360,6 +394,7 @@ pub fn select_cli_configuration(
           (Route::Radarr(..), Command::Radarr(_))
             | (Route::Sonarr(..), Command::Sonarr(_))
             | (Route::Lidarr(..), Command::Lidarr(_))
+            | (Route::Readarr(..), Command::Readarr(_))
         )
     });
     app.server_tabs.index = selected_index.ok_or_else(|| {

src/utils_tests.rs

@@ -1,6 +1,8 @@
 #[cfg(test)]
 mod tests {
+  use anyhow::{Error, anyhow};
   use clap::Parser;
+  use serde_json::json;
   use std::fs::{self, File};
   use std::io::{BufRead, BufReader, Seek, SeekFrom, Write};
 
@@ -11,7 +13,10 @@ mod tests {
   use crate::{
     Cli,
     app::{App, AppConfig, ServarrConfig},
-    utils::{convert_runtime, format_size, select_cli_configuration, was_log_rotated},
+    network::NetworkError,
+    utils::{
+      convert_runtime, format_cli_error, format_size, select_cli_configuration, was_log_rotated,
+    },
   };
 
   #[test]
@@ -64,6 +69,123 @@ mod tests {
     assert_eq!(minutes, 34);
   }
 
+  #[test]
+  fn test_format_cli_error_network_error_with_json_body() {
+    let error = Error::new(NetworkError {
+      message: "Request failed. Received 404 Not Found response code with body: Not Found"
+        .to_owned(),
+      status: 404,
+      body: Some(json!({ "status": 404, "title": "Not Found" })),
+    });
+
+    let output = format_cli_error(&error);
+
+    assert_str_eq!(
+      output,
+      r#"{
+  "error": {
+    "message": "Request failed. Received 404 Not Found response code with body: Not Found",
+    "status": 404,
+    "body": {
+      "status": 404,
+      "title": "Not Found"
+    }
+  }
+}"#
+    );
+  }
+
+  #[test]
+  fn test_format_cli_error_network_error_with_string_body() {
+    let error = Error::new(NetworkError {
+      message:
+        "Request failed. Received 503 Service Unavailable response code with body: Service Unavailable"
+          .to_owned(),
+      status: 503,
+      body: Some(json!("Service Unavailable")),
+    });
+
+    let output = format_cli_error(&error);
+
+    assert_str_eq!(
+      output,
+      r#"{
+  "error": {
+    "message": "Request failed. Received 503 Service Unavailable response code with body: Service Unavailable",
+    "status": 503,
+    "body": "Service Unavailable"
+  }
+}"#
+    );
+  }
+
+  #[test]
+  fn test_format_cli_error_network_error_with_null_body() {
+    let error = Error::new(NetworkError {
+      message: "Request failed. Received 404 Not Found response code with body: ".to_owned(),
+      status: 404,
+      body: None,
+    });
+
+    let output = format_cli_error(&error);
+
+    assert_str_eq!(
+      output,
+      r#"{
+  "error": {
+    "message": "Request failed. Received 404 Not Found response code with body: ",
+    "status": 404,
+    "body": null
+  }
+}"#
+    );
+  }
+
+  #[test]
+  fn test_format_cli_error_network_error_wrapped_in_context() {
+    let error = Error::new(NetworkError {
+      message: "Request failed. Received 404 Not Found response code with body: Not Found"
+        .to_owned(),
+      status: 404,
+      body: Some(json!({ "status": 404, "title": "Not Found" })),
+    })
+    .context("failed to fetch system status");
+
+    let output = format_cli_error(&error);
+
+    assert_str_eq!(
+      output,
+      r#"{
+  "error": {
+    "message": "Request failed. Received 404 Not Found response code with body: Not Found",
+    "status": 404,
+    "body": {
+      "status": 404,
+      "title": "Not Found"
+    }
+  }
+}"#
+    );
+  }
+
+  #[test]
+  fn test_format_cli_error_plain_anyhow_error() {
+    let error = anyhow!("Failed to send request. connection refused ");
+
+    let output = format_cli_error(&error);
+
+    assert_str_eq!(
+      output,
+      r#"{
+  "error": {
+    "message": "Failed to send request. connection refused ",
+    "status": null,
+    "body": null
+  }
+}"#
+    );
+  }
+
   #[test]
   fn test_was_log_rotated_returns_false_when_file_has_not_rotated() {
     let path = std::env::temp_dir().join("managarr_test_no_rotation.log");