From b50a97378649ca2467b5e02eda17c76b99e22d23 Mon Sep 17 00:00:00 2001
From: dawn <dawn@tangled.org>
Date: Fri, 16 Oct 2026 20:45:59 +0300
Subject: [PATCH] knot-config: add how long a member's read lease lasts

Signed-off-by: dawn <dawn@tangled.org>
---
 knot2/crates/knot-config/src/lib.rs | 23 +++++++++++++++++++++++
 knot2/example.toml                  |  5 +++++
 2 files changed, 28 insertions(+)

diff --git a/knot2/crates/knot-config/src/lib.rs b/knot2/crates/knot-config/src/lib.rs
index 8d808836e..8032ff1ef 100644
--- a/knot2/crates/knot-config/src/lib.rs
+++ b/knot2/crates/knot-config/src/lib.rs
@@ -46,6 +46,8 @@ pub struct KnotConfig {
     #[config(nested)]
     pub keyfill: KeyfillConfig,
     #[config(nested)]
+    pub leases: LeasesConfig,
+    #[config(nested)]
     pub resources: ResourcesConfig,
     #[config(nested)]
     pub homepage: HomepageConfig,
@@ -477,6 +479,12 @@ pub struct KeyfillConfig {
     pub reprieve_budget_secs: u64,
 }
 
+#[derive(Debug, Config)]
+pub struct LeasesConfig {
+    #[config(env = "KNOT_LEASES_TTL_DAYS", default = 3)]
+    pub ttl_days: u32,
+}
+
 #[derive(Debug, Config)]
 pub struct ResourcesConfig {
     #[config(env = "KNOT_MAX_THREADS", default = 0)]
@@ -806,6 +814,10 @@ impl KnotConfig {
                 self.keyfill.reprieve_budget_secs >= self.keyfill.reprieve_retry_secs,
                 "keyfill.reprieve_budget_secs must be at least keyfill.reprieve_retry_secs",
             ),
+            check(
+                (1..=MAX_SPAN_SECS / 86_400).contains(&u64::from(self.leases.ttl_days)),
+                "leases.ttl_days must be between one day and one year",
+            ),
             check(
                 self.maintenance.interval_secs > 0,
                 "maintenance.interval_secs must be greater than zero",
@@ -1387,6 +1399,7 @@ mod tests {
                 reprieve_retry_secs: 300,
                 reprieve_budget_secs: 21_600,
             },
+            leases: LeasesConfig { ttl_days: 3 },
             resources: ResourcesConfig {
                 max_threads: 0,
                 max_memory_bytes: 0,
@@ -1732,6 +1745,16 @@ mod tests {
                 },
                 "keyfill.reprieve_budget_secs must be at least",
             ),
+            (
+                "a_lease_ttl_of_zero_days",
+                |config| config.leases.ttl_days = 0,
+                "leases.ttl_days",
+            ),
+            (
+                "a_lease_ttl_past_a_year",
+                |config| config.leases.ttl_days = 366,
+                "leases.ttl_days",
+            ),
             (
                 "a_non_https_plc_directory",
                 |config| {
diff --git a/knot2/example.toml b/knot2/example.toml
index 5f6bcb1bc..cffbb0dea 100644
--- a/knot2/example.toml
+++ b/knot2/example.toml
@@ -461,6 +461,11 @@
 # Default value: 21600
 #reprieve_budget_secs = 21600
 
+[leases]
+# Can also be specified via environment variable `KNOT_LEASES_TTL_DAYS`.
+# Default value: 3
+#ttl_days = 3
+
 [resources]
 # Can also be specified via environment variable `KNOT_MAX_THREADS`.
 # Default value: 0
-- 
2.54.0