From 2427b22204c72443fd1890583e39568140037ea4 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Mon, 26 Oct 2026 19:00:35 +0100
Subject: POST timeout depends on content size

Replace the fixed timeout by a variable one depending on content size
with the formula: 10 s + content-size / 1 MiB/s
---
 src/transport/mycelium/mod.rs | 25 ++++++++++++++++++++++++-
 1 file changed, 24 insertions(+), 1 deletion(-)

(limited to 'src/transport')

diff --git a/src/transport/mycelium/mod.rs b/src/transport/mycelium/mod.rs
index f20f6a0..4edd1fd 100644
--- a/src/transport/mycelium/mod.rs
+++ b/src/transport/mycelium/mod.rs
@@ -15,6 +15,13 @@ pub mod daemon;
 pub use daemon::{MyceliumSetup, MyceliumSpawnConfig};
 
 const MYCELIUM_POLL_TIMEOUT_SECS: u64 = 300;
+/// How long a request to our Mycelium may take, before what its body adds
+/// (`post_timeout`).
+const REQUEST_TIMEOUT: Duration = Duration::from_secs(10);
+/// The slowest our Mycelium is expected to take a message body, in bytes per second:
+/// a large sync message gets more time than a PING, instead of failing (and being
+/// generated and sent whole again) at a fixed limit.
+const POST_MIN_RATE: u64 = 1 << 20;
 
 /// The one Mycelium topic all of continuum's messages travel on; what a message is, its
 /// payload says (`wire`).
@@ -74,7 +81,7 @@ impl MyceliumTransport {
         let rest_url = setup.rest_url.clone();
 
         let client = reqwest::Client::builder()
-            .timeout(Duration::from_secs(10))
+            .timeout(REQUEST_TIMEOUT)
             .build()?;
         let poll_client = reqwest::Client::builder()
             .timeout(Duration::from_secs(MYCELIUM_POLL_TIMEOUT_SECS + 30))
@@ -205,6 +212,7 @@ impl Transport for MyceliumTransport {
             .client
             .post(self.messages_endpoint.clone())
             .header(reqwest::header::CONTENT_TYPE, "application/json")
+            .timeout(post_timeout(message.body.len()))
             .body(message.body.clone())
             .send()
             .await?;
@@ -398,6 +406,12 @@ fn encode_payload(payload: &Vec<u8>) -> String {
     BASE64.encode(payload)
 }
 
+/// How long posting a body of `bytes` may take: `REQUEST_TIMEOUT`, plus the body at
+/// `POST_MIN_RATE`.
+fn post_timeout(bytes: usize) -> Duration {
+    REQUEST_TIMEOUT + Duration::from_millis(bytes as u64 * 1000 / POST_MIN_RATE)
+}
+
 /// Length of what padded base64 `encoded` decodes to.
 fn base64_decoded_len(encoded: &str) -> usize {
     let padding = encoded.bytes().rev().take_while(|&b| b == b'=').count();
@@ -478,6 +492,15 @@ mod tests {
     /// Mycelium splits messages into chunks of this size.
     const MYCELIUM_CHUNK: usize = 1300;
 
+    #[test]
+    fn post_timeout_grows_with_the_body() {
+        assert_eq!(post_timeout(0), REQUEST_TIMEOUT);
+        assert_eq!(
+            post_timeout(64 << 20),
+            REQUEST_TIMEOUT + Duration::from_secs(64)
+        );
+    }
+
     #[test]
     fn largest_keepalive_fits_in_one_chunk() {
         let keepalive = Keepalive {
-- 
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