fix(cli): improve dashboard download error handling and retry logic (#1154)
This PR fixes dashboard installation failures by improving HTTP error handling and adding retry logic for network issues. ## Problem Users were experiencing dashboard installation failures with cryptic error messages like "error sending request for url" when network issues occurred or when GitHub releases were temporarily unavailable. ## Changes - **Enhanced HTTP client**: Added proper User-Agent, timeouts (120s total, 30s connect), and better error formatting - **Retry logic**: Added exponential backoff retry (up to 3 attempts) for connection errors and server errors (5xx) - **Better error messages**: Improved error formatting with full error chain context - **Comprehensive tests**: Added unit tests for various failure scenarios (404, connection errors, partial downloads) ## Implementation Details - Replaced direct `reqwest::get()` calls with a configured HTTP client - Added `format_reqwest_error()` to provide detailed error context - Implemented retry logic in `download_bytes()` with exponential backoff - Added extensive test coverage including mock HTTP server scenarios Fixes #1146
This commit is contained in:
Chris Tate
+286
-30
@@ -183,9 +183,12 @@ fn platform_key() -> &'static str {
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}
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async fn fetch_download_url() -> Result<(String, String), String> {
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let resp = reqwest::get(LAST_KNOWN_GOOD_URL)
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let client = http_client()?;
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let resp = client
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.get(LAST_KNOWN_GOOD_URL)
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.send()
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.await
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.map_err(|e| format!("Failed to fetch version info: {}", e))?;
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.map_err(|e| format!("Failed to fetch version info: {}", format_reqwest_error(&e)))?;
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let body: serde_json::Value = resp
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.json()
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@@ -223,44 +226,110 @@ async fn fetch_download_url() -> Result<(String, String), String> {
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Ok((version, url))
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}
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fn format_reqwest_error(e: &reqwest::Error) -> String {
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let mut msg = e.to_string();
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let mut source = std::error::Error::source(e);
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while let Some(cause) = source {
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msg.push_str(&format!(": {}", cause));
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source = std::error::Error::source(cause);
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}
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msg
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}
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fn http_client() -> Result<reqwest::Client, String> {
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reqwest::Client::builder()
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.user_agent(format!("agent-browser/{}", env!("CARGO_PKG_VERSION")))
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.timeout(std::time::Duration::from_secs(120))
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.connect_timeout(std::time::Duration::from_secs(30))
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.build()
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.map_err(|e| format!("Failed to create HTTP client: {}", format_reqwest_error(&e)))
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}
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async fn download_bytes(url: &str) -> Result<Vec<u8>, String> {
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let resp = reqwest::get(url)
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.await
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.map_err(|e| format!("Download failed: {}", e))?;
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let client = http_client()?;
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let max_retries = 3;
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let mut last_err = String::new();
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let total = resp.content_length();
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let mut bytes = Vec::new();
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let mut stream = resp;
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let mut downloaded: u64 = 0;
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let mut last_pct: u64 = 0;
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for attempt in 0..max_retries {
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if attempt > 0 {
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eprintln!(
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" Retrying download (attempt {}/{})",
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attempt + 1,
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max_retries
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);
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tokio::time::sleep(std::time::Duration::from_secs(1 << attempt)).await;
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}
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loop {
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let chunk = stream
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.chunk()
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.await
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.map_err(|e| format!("Download error: {}", e))?;
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match chunk {
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Some(data) => {
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downloaded += data.len() as u64;
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bytes.extend_from_slice(&data);
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let resp = match client.get(url).send().await {
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Ok(r) => r,
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Err(e) => {
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last_err = format!("Download failed: {}", format_reqwest_error(&e));
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if e.is_connect() || e.is_timeout() {
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continue;
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}
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return Err(last_err);
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}
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};
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if let Some(total) = total {
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let pct = (downloaded * 100) / total;
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if pct >= last_pct + 5 {
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last_pct = pct;
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let mb = downloaded as f64 / 1_048_576.0;
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let total_mb = total as f64 / 1_048_576.0;
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eprint!("\r {:.0}/{:.0} MB ({pct}%)", mb, total_mb);
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let _ = io::stderr().flush();
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let status = resp.status();
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if !status.is_success() {
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last_err = format!(
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"Download failed: server returned HTTP {} for {}",
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status, url
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);
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if status.is_server_error() {
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continue;
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}
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return Err(last_err);
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}
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let total = resp.content_length();
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let mut bytes = Vec::new();
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let mut stream = resp;
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let mut downloaded: u64 = 0;
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let mut last_pct: u64 = 0;
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let mut chunk_err = None;
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loop {
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let chunk = stream
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.chunk()
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.await
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.map_err(|e| format!("Download error: {}", format_reqwest_error(&e)));
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match chunk {
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Ok(Some(data)) => {
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downloaded += data.len() as u64;
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bytes.extend_from_slice(&data);
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if let Some(total) = total {
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let pct = (downloaded * 100) / total;
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if pct >= last_pct + 5 {
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last_pct = pct;
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let mb = downloaded as f64 / 1_048_576.0;
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let total_mb = total as f64 / 1_048_576.0;
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eprint!("\r {:.0}/{:.0} MB ({pct}%)", mb, total_mb);
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let _ = io::stderr().flush();
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}
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}
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}
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Ok(None) => break,
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Err(e) => {
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chunk_err = Some(e);
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break;
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}
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}
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None => break,
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}
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eprintln!();
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if let Some(e) = chunk_err {
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last_err = e;
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continue;
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}
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return Ok(bytes);
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}
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eprintln!();
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Ok(bytes)
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Err(last_err)
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}
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fn extract_zip(bytes: Vec<u8>, dest: &Path) -> Result<(), String> {
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@@ -780,6 +849,193 @@ pub fn run_dashboard_install() {
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use tokio::io::{AsyncReadExt, AsyncWriteExt};
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use tokio::net::TcpListener;
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fn http_response(status: u16, reason: &str, body: &[u8]) -> Vec<u8> {
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let header = format!(
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"HTTP/1.1 {} {}\r\nContent-Length: {}\r\nConnection: close\r\n\r\n",
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status,
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reason,
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body.len()
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);
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let mut resp = header.into_bytes();
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resp.extend_from_slice(body);
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resp
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}
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async fn accept_once(listener: &TcpListener, response: &[u8]) {
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let (mut s, _) = listener.accept().await.unwrap();
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let mut buf = [0u8; 4096];
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let _ = s.read(&mut buf).await;
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s.write_all(response).await.unwrap();
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}
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async fn accept_with_ua_check(listener: &TcpListener, response: &[u8]) -> String {
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let (mut s, _) = listener.accept().await.unwrap();
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let mut buf = [0u8; 4096];
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let n = s.read(&mut buf).await.unwrap();
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let request = String::from_utf8_lossy(&buf[..n]).to_string();
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s.write_all(response).await.unwrap();
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request
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}
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#[tokio::test]
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async fn download_bytes_returns_body_on_200() {
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let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
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let port = listener.local_addr().unwrap().port();
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let body = b"fake-zip-content";
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let resp = http_response(200, "OK", body);
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let server = tokio::spawn(async move {
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accept_once(&listener, &resp).await;
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});
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let url = format!("http://127.0.0.1:{}/test.zip", port);
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let result = download_bytes(&url).await;
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assert!(result.is_ok());
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assert_eq!(result.unwrap(), body);
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server.await.unwrap();
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}
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#[tokio::test]
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async fn download_bytes_returns_error_on_404() {
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let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
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let port = listener.local_addr().unwrap().port();
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let resp = http_response(404, "Not Found", b"not found");
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let server = tokio::spawn(async move {
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accept_once(&listener, &resp).await;
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});
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let url = format!("http://127.0.0.1:{}/test.zip", port);
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let result = download_bytes(&url).await;
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assert!(result.is_err());
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let err = result.unwrap_err();
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assert!(
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err.contains("HTTP 404"),
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"expected HTTP 404 in error, got: {}",
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err
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);
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server.await.unwrap();
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}
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#[tokio::test]
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async fn download_bytes_retries_on_500() {
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let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
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let port = listener.local_addr().unwrap().port();
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let server = tokio::spawn(async move {
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// First two attempts: 500
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let r500 = http_response(500, "Internal Server Error", b"error");
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accept_once(&listener, &r500).await;
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accept_once(&listener, &r500).await;
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// Third attempt: 200
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let r200 = http_response(200, "OK", b"ok-data");
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accept_once(&listener, &r200).await;
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});
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let url = format!("http://127.0.0.1:{}/test.zip", port);
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let result = download_bytes(&url).await;
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assert!(
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result.is_ok(),
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"expected success after retries: {:?}",
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result
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);
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assert_eq!(result.unwrap(), b"ok-data");
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server.await.unwrap();
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}
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#[tokio::test]
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async fn download_bytes_gives_up_after_max_retries() {
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let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
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let port = listener.local_addr().unwrap().port();
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let server = tokio::spawn(async move {
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let r500 = http_response(500, "Internal Server Error", b"error");
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// All 3 attempts get 500
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accept_once(&listener, &r500).await;
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accept_once(&listener, &r500).await;
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accept_once(&listener, &r500).await;
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});
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let url = format!("http://127.0.0.1:{}/test.zip", port);
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let result = download_bytes(&url).await;
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assert!(result.is_err());
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let err = result.unwrap_err();
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assert!(
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err.contains("HTTP 500"),
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"expected HTTP 500 in error, got: {}",
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err
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);
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server.await.unwrap();
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}
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#[tokio::test]
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async fn download_bytes_does_not_retry_on_403() {
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let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
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let port = listener.local_addr().unwrap().port();
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let resp = http_response(403, "Forbidden", b"forbidden");
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let server = tokio::spawn(async move {
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// Only one request should arrive (no retries for 4xx)
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accept_once(&listener, &resp).await;
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});
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let url = format!("http://127.0.0.1:{}/test.zip", port);
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let result = download_bytes(&url).await;
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assert!(result.is_err());
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assert!(result.unwrap_err().contains("HTTP 403"));
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server.await.unwrap();
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}
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#[tokio::test]
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async fn http_client_sends_user_agent() {
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let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
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let port = listener.local_addr().unwrap().port();
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let resp = http_response(200, "OK", b"ok");
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let server = tokio::spawn(async move {
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let req = accept_with_ua_check(&listener, &resp).await;
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req
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});
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let client = http_client().unwrap();
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let url = format!("http://127.0.0.1:{}/test", port);
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let _ = client.get(&url).send().await;
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let request_text = server.await.unwrap();
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let expected_ua = format!("agent-browser/{}", env!("CARGO_PKG_VERSION"));
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assert!(
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request_text.contains(&expected_ua),
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"expected User-Agent '{}' in request:\n{}",
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expected_ua,
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request_text
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);
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}
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#[test]
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fn download_bytes_connection_refused_includes_details() {
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// Use a port that nothing is listening on
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let rt = tokio::runtime::Builder::new_current_thread()
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.enable_all()
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.build()
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.unwrap();
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let result = rt.block_on(download_bytes("http://127.0.0.1:1/test.zip"));
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assert!(result.is_err());
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let err = result.unwrap_err();
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// The new code should include the root cause (connection refused)
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// not just the vague "error sending request for url"
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assert!(
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err.contains("Connection refused") || err.contains("connection refused"),
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"expected 'connection refused' in error, got: {}",
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err
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);
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}
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}
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fn extract_dashboard_zip(bytes: Vec<u8>, dest: &Path) -> Result<(), String> {
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fs::create_dir_all(dest).map_err(|e| format!("Failed to create directory: {}", e))?;
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