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end_of_support.rs
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end_of_support.rs
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//! End of support checking task.
use std::time::Duration;
use color_eyre::Report;
use zebra_chain::{
block::Height,
chain_tip::ChainTip,
parameters::{Network, NetworkUpgrade},
};
use crate::application::release_version;
/// The estimated height that this release will be published.
pub const ESTIMATED_RELEASE_HEIGHT: u32 = 2_626_500;
/// The maximum number of days after `ESTIMATED_RELEASE_HEIGHT` where a Zebra server will run
/// without halting.
///
/// Notes:
///
/// - Zebra will exit with a panic if the current tip height is bigger than the `ESTIMATED_RELEASE_HEIGHT`
/// plus this number of days.
/// - Currently set to 14 weeks.
pub const EOS_PANIC_AFTER: u32 = 70;
/// The number of days before the end of support where Zebra will display warnings.
pub const EOS_WARN_AFTER: u32 = EOS_PANIC_AFTER - 14;
/// A string which is part of the panic that will be displayed if Zebra halts.
pub const EOS_PANIC_MESSAGE_HEADER: &str = "Zebra refuses to run";
/// A string which is part of the warning that will be displayed if Zebra release is close to halting.
pub const EOS_WARN_MESSAGE_HEADER: &str = "Your Zebra release is too old and it will stop running";
/// The amount of time between end of support checks.
const CHECK_INTERVAL: Duration = Duration::from_secs(60 * 60);
/// Wait a few seconds at startup so `best_tip_height` is always `Some`.
const INITIAL_WAIT: Duration = Duration::from_secs(10);
/// Start the end of support checking task for Mainnet.
pub async fn start(
network: Network,
latest_chain_tip: impl ChainTip + std::fmt::Debug,
) -> Result<(), Report> {
info!("Starting end of support task");
tokio::time::sleep(INITIAL_WAIT).await;
loop {
if network == Network::Mainnet {
if let Some(tip_height) = latest_chain_tip.best_tip_height() {
check(tip_height, &network);
}
} else {
info!("Release always valid in Testnet");
}
tokio::time::sleep(CHECK_INTERVAL).await;
}
}
/// Check if the current release is too old and panic if so.
pub fn check(tip_height: Height, network: &Network) {
info!("Checking if Zebra release is inside support range ...");
// Get the current block spacing
let target_block_spacing = NetworkUpgrade::target_spacing_for_height(network, tip_height);
// Get the number of blocks per day
let estimated_blocks_per_day =
u32::try_from(chrono::Duration::days(1).num_seconds() / target_block_spacing.num_seconds())
.expect("number is always small enough to fit");
let panic_height =
Height(ESTIMATED_RELEASE_HEIGHT + (EOS_PANIC_AFTER * estimated_blocks_per_day));
let warn_height =
Height(ESTIMATED_RELEASE_HEIGHT + (EOS_WARN_AFTER * estimated_blocks_per_day));
if tip_height > panic_height {
panic!(
"{EOS_PANIC_MESSAGE_HEADER} if the release date is older than {EOS_PANIC_AFTER} days. \
\nRelease name: {}, Estimated release height: {ESTIMATED_RELEASE_HEIGHT} \
\nHint: Download and install the latest Zebra release from: https://github.com/ZcashFoundation/zebra/releases/latest",
release_version()
);
} else if tip_height > warn_height {
warn!(
"{EOS_WARN_MESSAGE_HEADER} at block {}. \
\nRelease name: {}, Estimated release height: {ESTIMATED_RELEASE_HEIGHT} \
\nHint: Download and install the latest Zebra release from: https://github.com/ZcashFoundation/zebra/releases/latest", panic_height.0, release_version()
);
} else {
info!("Zebra release is supported until block {}, please report bugs at https://github.com/ZcashFoundation/zebra/issues", panic_height.0);
}
}