Top up canisters which have fewer than MIN_CYCLES_BALANCE cycles

backend/canisters/local_group_index/CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [unreleased]
 
+### Changed
+
+- Top up canisters which have fewer than `MIN_CYCLES_BALANCE` cycles ([#6819](https://github.com/open-chat-labs/open-chat/pull/6819))
+
 ## [[2.0.1449](https://github.com/open-chat-labs/open-chat/releases/tag/v2.0.1449-local_group_index)] - 2024-11-13
 
 ### Added

backend/canisters/local_group_index/impl/src/jobs/topup_canisters.rs

@@ -93,7 +93,9 @@ fn next(state: &mut RuntimeState) -> GetNextResult {
 async fn run_async(canister_id: CanisterId) {
     match ic_cdk::api::management_canister::main::canister_status(CanisterIdRecord { canister_id }).await {
         Ok((status,)) => {
-            if status.cycles < Nat::from(60u32) * status.idle_cycles_burned_per_day {
+            if status.cycles < utils::cycles::MIN_CYCLES_BALANCE
+                || status.cycles < Nat::from(60u32) * status.idle_cycles_burned_per_day
+            {
                 top_up_canister(Some(canister_id)).await;
             }
         }

backend/canisters/local_user_index/CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ## [unreleased]
 
+### Changed
+
+- Top up canisters which have fewer than `MIN_CYCLES_BALANCE` cycles ([#6819](https://github.com/open-chat-labs/open-chat/pull/6819))
+
 ## [[2.0.1447](https://github.com/open-chat-labs/open-chat/releases/tag/v2.0.1447-local_user_index)] - 2024-11-13
 
 ### Changed

backend/canisters/local_user_index/impl/src/jobs/topup_canisters.rs

@@ -86,7 +86,9 @@ async fn run_async(user_id: UserId) {
     .await
     {
         Ok((status,)) => {
-            if status.cycles < Nat::from(60u32) * status.idle_cycles_burned_per_day {
+            if status.cycles < utils::cycles::MIN_CYCLES_BALANCE
+                || status.cycles < Nat::from(60u32) * status.idle_cycles_burned_per_day
+            {
                 top_up_user(Some(user_id)).await;
             }
         }

backend/canisters/local_user_index/impl/src/lib.rs

@@ -316,6 +316,7 @@ struct Data {
     pub ic_root_key: Vec<u8>,
     pub events_for_remote_users: Vec<(UserId, UserEvent)>,
     pub canisters_pending_events_migration_to_stable_memory: Vec<CanisterId>,
+    #[serde(skip_deserializing)]
     pub cycles_balance_check_queue: VecDeque<UserId>,
 }
 

backend/libraries/utils/src/cycles/check_cycles_balance.rs

@@ -5,7 +5,7 @@ use tracing::error;
 use types::{CanisterId, Cycles};
 
 const FREEZE_THRESHOLD_SECONDS: u32 = 30 * 24 * 60 * 60; // 30 days
-const MIN_CYCLES_BALANCE: Cycles = CYCLES_REQUIRED_FOR_UPGRADE + 50_000_000_000;
+pub const MIN_CYCLES_BALANCE: Cycles = CYCLES_REQUIRED_FOR_UPGRADE + 50_000_000_000;
 const GB_STORAGE_PER_SECOND_FEE: Cycles = 127_000;
 
 pub fn check_cycles_balance(top_up_canister_id: CanisterId) {

backend/libraries/utils/src/cycles/mod.rs

@@ -8,7 +8,7 @@ mod cycles_dispenser_client;
 pub use self::cycles_dispenser_client::init_cycles_dispenser_client;
 pub use accept_cycles::accept_cycles;
 pub use can_spend_cycles::can_spend_cycles;
-pub use check_cycles_balance::{check_cycles_balance, send_low_balance_notification};
+pub use check_cycles_balance::{check_cycles_balance, send_low_balance_notification, MIN_CYCLES_BALANCE};
 
 pub fn is_out_of_cycles_error(code: RejectionCode, message: &str) -> bool {
     code == RejectionCode::SysTransient && message.starts_with("IC0207:")