mithril_client/feedback.rs
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//! # Long task feedbacks
//!
//! Even with fast computer and network, some tasks can take more than a few
//! seconds to run (or even more than an hour for a snapshot download).
//!
//! Those tasks are:
//! - Snapshot download
//! - Certificate chain validation
//!
//! In order to have feedbacks for those tasks, a mechanism is available.
//!
//! Define your feedback receiver and implement the [FeedbackReceiver] trait to receive
//! [events][MithrilEvent] with the [`handle_event`][FeedbackReceiver::handle_event] method.
//! Then pass an instance of your receiver when building your `Client` using
//! [`ClientBuilder::add_feedback_receiver`][crate::ClientBuilder::add_feedback_receiver] method.
//!
//! # Example
//!
//! Using the provided [SlogFeedbackReceiver] to log the events using a [slog] logger.
//!
//! ```no_run
//! use std::sync::Arc;
//! # async fn run() -> mithril_client::MithrilResult<()> {
//! use mithril_client::{ClientBuilder, MessageBuilder, feedback::SlogFeedbackReceiver};
//!
//! let client = ClientBuilder::aggregator("YOUR_AGGREGATOR_ENDPOINT", "YOUR_GENESIS_VERIFICATION_KEY")
//! .add_feedback_receiver(Arc::new(SlogFeedbackReceiver::new(build_logger())))
//! .build()?;
//!
//! let _ = client.certificate().verify_chain("CERTIFICATE_HASH").await?;
//! #
//! # Ok(())
//! # }
//!
//! pub fn build_logger() -> slog::Logger {
//! use slog::Drain;
//! let decorator = slog_term::TermDecorator::new().build();
//! let drain = slog_term::FullFormat::new(decorator).build().fuse();
//! let drain = slog_async::Async::new(drain).build().fuse();
//!
//! slog::Logger::root(Arc::new(drain), slog::o!())
//! }
//! ```
//!
//! Running this code should yield the following logs (example run on _pre-release-preview_):
//!
//! ```shell
//! Nov 08 14:41:40.436 INFO Certificate chain validation started, certificate_chain_validation_id: ab623989-b0ac-4031-8522-1370958bbb4e
//! Nov 08 14:41:40.626 INFO Certificate validated, certificate_chain_validation_id: ab623989-b0ac-4031-8522-1370958bbb4e, certificate_hash: dd4d4299cfb817b5ee5987c3de7cf5f13bdcda69c968ef087effd550470dc081
//! Nov 08 14:42:05.477 INFO Certificate validated, certificate_chain_validation_id: ab623989-b0ac-4031-8522-1370958bbb4e, certificate_hash: 660b3d426a95303254bb255a56bed443616ea63c4d721ea77433b920d7ebdf62
//! Nov 08 14:42:05.477 INFO Certificate chain validated, certificate_chain_validation_id: ab623989-b0ac-4031-8522-1370958bbb4e
//! ```
use async_trait::async_trait;
use mithril_common::entities::ImmutableFileNumber;
use serde::Serialize;
use slog::{info, Logger};
use std::sync::{Arc, RwLock};
use strum::Display;
use uuid::Uuid;
/// Event that can be reported by a [FeedbackReceiver] for Cardano database related events.
#[derive(Debug, Clone, Eq, PartialEq, Display, Serialize)]
#[strum(serialize_all = "PascalCase")]
#[serde(untagged)]
pub enum MithrilEventCardanoDatabase {
/// Cardano Database download sequence started
Started {
/// Unique identifier used to track a cardano database download
download_id: String,
/// Total number of immutable files
total_immutable_files: u64,
/// Total number of ancillary files
include_ancillary: bool,
},
/// Cardano Database download sequence completed
Completed {
/// Unique identifier used to track a cardano database download
download_id: String,
},
/// An immutable archive file download has started
ImmutableDownloadStarted {
/// Immutable file number downloaded
immutable_file_number: ImmutableFileNumber,
/// Unique identifier used to track a cardano database download
download_id: String,
/// Size of the downloaded archive
size: u64,
},
/// An immutable archive file download is in progress
ImmutableDownloadProgress {
/// Immutable file number downloaded
immutable_file_number: ImmutableFileNumber,
/// Unique identifier used to track a cardano database download
download_id: String,
/// Number of bytes that have been downloaded
downloaded_bytes: u64,
/// Size of the downloaded archive
size: u64,
},
/// An immutable archive file download has completed
ImmutableDownloadCompleted {
/// Immutable file number downloaded
immutable_file_number: ImmutableFileNumber,
/// Unique identifier used to track a cardano database download
download_id: String,
},
/// An ancillary archive file download has started
AncillaryDownloadStarted {
/// Unique identifier used to track a cardano database download
download_id: String,
/// Size of the downloaded archive
size: u64,
},
/// An ancillary archive file download is in progress
AncillaryDownloadProgress {
/// Unique identifier used to track a cardano database download
download_id: String,
/// Number of bytes that have been downloaded
downloaded_bytes: u64,
/// Size of the downloaded archive
size: u64,
},
/// An ancillary archive file download has completed
AncillaryDownloadCompleted {
/// Unique identifier used to track a cardano database download
download_id: String,
},
/// A digest file download has started
DigestDownloadStarted {
/// Unique identifier used to track a cardano database download
download_id: String,
},
/// A digest file download is in progress
DigestDownloadProgress {
/// Unique identifier used to track a cardano database download
download_id: String,
/// Number of bytes that have been downloaded
downloaded_bytes: u64,
/// Size of the downloaded archive
size: u64,
},
/// A digest file download has completed
DigestDownloadCompleted {
/// Unique identifier used to track a cardano database download
download_id: String,
},
}
/// Event that can be reported by a [FeedbackReceiver].
#[derive(Debug, Clone, Eq, PartialEq, Display, Serialize)]
#[strum(serialize_all = "PascalCase")]
#[serde(untagged)]
pub enum MithrilEvent {
/// A snapshot download has started
SnapshotDownloadStarted {
/// Digest of the downloaded snapshot
digest: String,
/// Unique identifier used to track this specific snapshot download
download_id: String,
/// Size of the downloaded archive
size: u64,
},
/// A snapshot download is in progress
SnapshotDownloadProgress {
/// Unique identifier used to track this specific snapshot download
download_id: String,
/// Number of bytes that have been downloaded
downloaded_bytes: u64,
/// Size of the downloaded archive
size: u64,
},
/// A snapshot download has completed
SnapshotDownloadCompleted {
/// Unique identifier used to track this specific snapshot download
download_id: String,
},
/// Cardano database related events
CardanoDatabase(MithrilEventCardanoDatabase),
/// A certificate chain validation has started
CertificateChainValidationStarted {
/// Unique identifier used to track this specific certificate chain validation
certificate_chain_validation_id: String,
},
/// An individual certificate of a chain have been validated.
CertificateValidated {
/// Unique identifier used to track this specific certificate chain validation
certificate_chain_validation_id: String,
/// The validated certificate hash
certificate_hash: String,
},
/// An individual certificate of a chain have been fetched from the cache.
CertificateFetchedFromCache {
/// Unique identifier used to track this specific certificate chain validation
certificate_chain_validation_id: String,
/// The fetched certificate hash
certificate_hash: String,
},
/// The whole certificate chain is valid.
CertificateChainValidated {
/// Unique identifier used to track this specific certificate chain validation
certificate_chain_validation_id: String,
},
}
impl MithrilEvent {
/// Generate a random unique identifier to identify a snapshot download
pub fn new_snapshot_download_id() -> String {
Uuid::new_v4().to_string()
}
/// Generate a random unique identifier to identify a Cardano download
pub fn new_cardano_database_download_id() -> String {
Uuid::new_v4().to_string()
}
/// Generate a random unique identifier to identify a certificate chain validation
pub fn new_certificate_chain_validation_id() -> String {
Uuid::new_v4().to_string()
}
#[cfg(test)]
pub(crate) fn event_id(&self) -> &str {
match self {
MithrilEvent::SnapshotDownloadStarted { download_id, .. } => download_id,
MithrilEvent::SnapshotDownloadProgress { download_id, .. } => download_id,
MithrilEvent::SnapshotDownloadCompleted { download_id } => download_id,
MithrilEvent::CardanoDatabase(MithrilEventCardanoDatabase::Started {
download_id,
..
}) => download_id,
MithrilEvent::CardanoDatabase(MithrilEventCardanoDatabase::Completed {
download_id,
..
}) => download_id,
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::ImmutableDownloadStarted { download_id, .. },
) => download_id,
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::ImmutableDownloadProgress { download_id, .. },
) => download_id,
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::ImmutableDownloadCompleted { download_id, .. },
) => download_id,
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::AncillaryDownloadStarted { download_id, .. },
) => download_id,
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::AncillaryDownloadProgress { download_id, .. },
) => download_id,
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::AncillaryDownloadCompleted { download_id, .. },
) => download_id,
MithrilEvent::CardanoDatabase(MithrilEventCardanoDatabase::DigestDownloadStarted {
download_id,
..
}) => download_id,
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::DigestDownloadProgress { download_id, .. },
) => download_id,
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::DigestDownloadCompleted { download_id, .. },
) => download_id,
MithrilEvent::CertificateChainValidationStarted {
certificate_chain_validation_id,
} => certificate_chain_validation_id,
MithrilEvent::CertificateValidated {
certificate_chain_validation_id,
..
} => certificate_chain_validation_id,
MithrilEvent::CertificateFetchedFromCache {
certificate_chain_validation_id,
..
} => certificate_chain_validation_id,
MithrilEvent::CertificateChainValidated {
certificate_chain_validation_id,
} => certificate_chain_validation_id,
}
}
}
/// A sender of [MithrilEvent].
///
/// It uses Arc internally so it can be cloned at will.
#[derive(Clone)]
pub struct FeedbackSender {
receivers: Vec<Arc<dyn FeedbackReceiver>>,
}
impl FeedbackSender {
/// Create a new [FeedbackSender].
pub fn new(receivers: &[Arc<dyn FeedbackReceiver>]) -> FeedbackSender {
Self {
receivers: receivers.to_vec(),
}
}
/// Send the given event to the known receivers.
pub async fn send_event(&self, event: MithrilEvent) {
for receiver in &self.receivers {
receiver.handle_event(event.clone()).await;
}
}
}
/// A receiver of [MithrilEvent].
#[cfg_attr(target_family = "wasm", async_trait(?Send))]
#[cfg_attr(not(target_family = "wasm"), async_trait)]
pub trait FeedbackReceiver: Sync + Send {
/// Callback called by a [FeedbackSender] when it needs to send an [event][MithrilEvent].
async fn handle_event(&self, event: MithrilEvent);
}
/// A [FeedbackReceiver] that writes the event it receives in a [slog logger][Logger].
pub struct SlogFeedbackReceiver {
logger: Logger,
}
impl SlogFeedbackReceiver {
/// Create a new [SlogFeedbackReceiver].
pub fn new(logger: Logger) -> SlogFeedbackReceiver {
Self { logger }
}
}
#[cfg_attr(target_family = "wasm", async_trait(?Send))]
#[cfg_attr(not(target_family = "wasm"), async_trait)]
impl FeedbackReceiver for SlogFeedbackReceiver {
async fn handle_event(&self, event: MithrilEvent) {
match event {
MithrilEvent::SnapshotDownloadStarted {
digest,
download_id,
size,
} => {
info!(
self.logger, "Snapshot download started";
"size" => size, "digest" => digest, "download_id" => download_id,
);
}
MithrilEvent::SnapshotDownloadProgress {
download_id,
downloaded_bytes,
size,
} => {
info!(
self.logger, "Snapshot download in progress ...";
"downloaded_bytes" => downloaded_bytes, "size" => size, "download_id" => download_id,
);
}
MithrilEvent::SnapshotDownloadCompleted { download_id } => {
info!(self.logger, "Snapshot download completed"; "download_id" => download_id);
}
MithrilEvent::CardanoDatabase(MithrilEventCardanoDatabase::Started {
download_id,
total_immutable_files,
include_ancillary,
}) => {
info!(
self.logger, "Cardano database download started"; "download_id" => download_id, "total_immutable_files" => total_immutable_files, "include_ancillary" => include_ancillary,
);
}
MithrilEvent::CardanoDatabase(MithrilEventCardanoDatabase::Completed {
download_id,
}) => {
info!(
self.logger, "Cardano database download completed"; "download_id" => download_id,
);
}
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::ImmutableDownloadStarted {
immutable_file_number,
download_id,
size,
},
) => {
info!(
self.logger, "Immutable download started";
"immutable_file_number" => immutable_file_number, "download_id" => download_id, "size" => size
);
}
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::ImmutableDownloadProgress {
immutable_file_number,
download_id,
downloaded_bytes,
size,
},
) => {
info!(
self.logger, "Immutable download in progress ...";
"immutable_file_number" => immutable_file_number, "downloaded_bytes" => downloaded_bytes, "size" => size, "download_id" => download_id,
);
}
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::ImmutableDownloadCompleted {
immutable_file_number,
download_id,
},
) => {
info!(self.logger, "Immutable download completed"; "immutable_file_number" => immutable_file_number, "download_id" => download_id);
}
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::AncillaryDownloadStarted { download_id, size },
) => {
info!(
self.logger, "Ancillary download started";
"download_id" => download_id,
"size" => size,
);
}
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::AncillaryDownloadProgress {
download_id,
downloaded_bytes,
size,
},
) => {
info!(
self.logger, "Ancillary download in progress ...";
"downloaded_bytes" => downloaded_bytes, "size" => size, "download_id" => download_id,
);
}
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::AncillaryDownloadCompleted { download_id },
) => {
info!(self.logger, "Ancillary download completed"; "download_id" => download_id);
}
MithrilEvent::CardanoDatabase(MithrilEventCardanoDatabase::DigestDownloadStarted {
download_id,
}) => {
info!(
self.logger, "Digest download started";
"download_id" => download_id,
);
}
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::DigestDownloadProgress {
download_id,
downloaded_bytes,
size,
},
) => {
info!(
self.logger, "Digest download in progress ...";
"downloaded_bytes" => downloaded_bytes, "size" => size, "download_id" => download_id,
);
}
MithrilEvent::CardanoDatabase(
MithrilEventCardanoDatabase::DigestDownloadCompleted { download_id },
) => {
info!(self.logger, "Digest download completed"; "download_id" => download_id);
}
MithrilEvent::CertificateChainValidationStarted {
certificate_chain_validation_id,
} => {
info!(
self.logger, "Certificate chain validation started";
"certificate_chain_validation_id" => certificate_chain_validation_id,
);
}
MithrilEvent::CertificateValidated {
certificate_hash,
certificate_chain_validation_id,
} => {
info!(
self.logger, "Certificate validated";
"certificate_hash" => certificate_hash,
"certificate_chain_validation_id" => certificate_chain_validation_id,
);
}
MithrilEvent::CertificateFetchedFromCache {
certificate_hash,
certificate_chain_validation_id,
} => {
info!(
self.logger, "Cached";
"certificate_hash" => certificate_hash,
"certificate_chain_validation_id" => certificate_chain_validation_id,
);
}
MithrilEvent::CertificateChainValidated {
certificate_chain_validation_id,
} => {
info!(
self.logger, "Certificate chain validated";
"certificate_chain_validation_id" => certificate_chain_validation_id,
);
}
};
}
}
/// A [FeedbackReceiver] that stacks the events that it receives in a vec.
///
/// Use it only for tests purpose.
pub struct StackFeedbackReceiver {
stacked_events: RwLock<Vec<MithrilEvent>>,
}
impl StackFeedbackReceiver {
/// Create a new [StackFeedbackReceiver].
pub fn new() -> StackFeedbackReceiver {
Self {
stacked_events: RwLock::new(vec![]),
}
}
/// Returns a copy of the stored stacked events.
///
/// Will crash if it can't access the stored events.
pub fn stacked_events(&self) -> Vec<MithrilEvent> {
let events = self.stacked_events.read().unwrap();
events.clone()
}
}
impl Default for StackFeedbackReceiver {
fn default() -> Self {
Self::new()
}
}
#[cfg_attr(target_family = "wasm", async_trait(?Send))]
#[cfg_attr(not(target_family = "wasm"), async_trait)]
impl FeedbackReceiver for StackFeedbackReceiver {
async fn handle_event(&self, event: MithrilEvent) {
let mut events = self.stacked_events.write().unwrap();
events.push(event);
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::feedback::MithrilEvent::{SnapshotDownloadCompleted, SnapshotDownloadStarted};
use std::time::Duration;
use tokio::task::JoinSet;
#[tokio::test]
async fn send_event_same_thread() {
let receiver = Arc::new(StackFeedbackReceiver::new());
let sender = FeedbackSender::new(&[receiver.clone()]);
sender
.send_event(SnapshotDownloadStarted {
digest: "digest".to_string(),
download_id: "download_id".to_string(),
size: 10,
})
.await;
sender
.send_event(SnapshotDownloadCompleted {
download_id: "download_id".to_string(),
})
.await;
assert_eq!(
receiver.stacked_events(),
vec![
SnapshotDownloadStarted {
digest: "digest".to_string(),
download_id: "download_id".to_string(),
size: 10
},
SnapshotDownloadCompleted {
download_id: "download_id".to_string()
}
]
);
}
#[tokio::test]
async fn send_event_multiple_thread() {
let receiver = Arc::new(StackFeedbackReceiver::new());
let sender = FeedbackSender::new(&[
receiver.clone(),
Arc::new(SlogFeedbackReceiver::new(crate::test_utils::test_logger())),
]);
let sender2 = sender.clone();
let mut join_set = JoinSet::new();
join_set.spawn(async move {
// Step 1:
sender
.send_event(SnapshotDownloadStarted {
digest: "digest1".to_string(),
download_id: "download1".to_string(),
size: 1,
})
.await;
tokio::time::sleep(Duration::from_millis(2)).await;
// Step 3:
sender
.send_event(SnapshotDownloadCompleted {
download_id: "download3".to_string(),
})
.await;
sender
.send_event(SnapshotDownloadStarted {
digest: "digest2".to_string(),
download_id: "download2".to_string(),
size: 2,
})
.await;
});
join_set.spawn(async move {
// Step 2:
sender2
.send_event(SnapshotDownloadCompleted {
download_id: "download1".to_string(),
})
.await;
sender2
.send_event(SnapshotDownloadStarted {
digest: "digest3".to_string(),
download_id: "download3".to_string(),
size: 3,
})
.await;
tokio::time::sleep(Duration::from_millis(5)).await;
// Step 4:
sender2
.send_event(SnapshotDownloadCompleted {
download_id: "download2".to_string(),
})
.await;
});
while let Some(res) = join_set.join_next().await {
res.unwrap();
}
assert_eq!(
receiver.stacked_events(),
vec![
SnapshotDownloadStarted {
digest: "digest1".to_string(),
download_id: "download1".to_string(),
size: 1
},
SnapshotDownloadCompleted {
download_id: "download1".to_string()
},
SnapshotDownloadStarted {
digest: "digest3".to_string(),
download_id: "download3".to_string(),
size: 3
},
SnapshotDownloadCompleted {
download_id: "download3".to_string()
},
SnapshotDownloadStarted {
digest: "digest2".to_string(),
download_id: "download2".to_string(),
size: 2
},
SnapshotDownloadCompleted {
download_id: "download2".to_string()
},
]
);
}
#[tokio::test]
async fn send_event_in_one_thread_and_receive_in_another_thread() {
let receiver = Arc::new(StackFeedbackReceiver::new());
let receiver2 = receiver.clone();
let sender = FeedbackSender::new(&[receiver.clone()]);
let mut join_set = JoinSet::new();
join_set.spawn(async move {
// Step 1:
sender
.send_event(SnapshotDownloadStarted {
digest: "digest1".to_string(),
download_id: "download1".to_string(),
size: 1,
})
.await;
tokio::time::sleep(Duration::from_millis(10)).await;
// Step 2:
sender
.send_event(SnapshotDownloadCompleted {
download_id: "download1".to_string(),
})
.await;
sender
.send_event(SnapshotDownloadStarted {
digest: "digest2".to_string(),
download_id: "download2".to_string(),
size: 2,
})
.await;
tokio::time::sleep(Duration::from_millis(10)).await;
// Step 3:
sender
.send_event(SnapshotDownloadCompleted {
download_id: "download2".to_string(),
})
.await;
sender
.send_event(SnapshotDownloadStarted {
digest: "digest3".to_string(),
download_id: "download3".to_string(),
size: 3,
})
.await;
tokio::time::sleep(Duration::from_millis(10)).await;
// Final step:
sender
.send_event(SnapshotDownloadCompleted {
download_id: "download3".to_string(),
})
.await;
});
join_set.spawn(async move {
// Little sleep to wait for step 1 completion
tokio::time::sleep(Duration::from_millis(3)).await;
assert_eq!(
receiver2.stacked_events(),
vec![SnapshotDownloadStarted {
digest: "digest1".to_string(),
download_id: "download1".to_string(),
size: 1
},]
);
// Wait for step 2 completion
tokio::time::sleep(Duration::from_millis(10)).await;
assert_eq!(
receiver2.stacked_events(),
vec![
SnapshotDownloadStarted {
digest: "digest1".to_string(),
download_id: "download1".to_string(),
size: 1
},
SnapshotDownloadCompleted {
download_id: "download1".to_string()
},
SnapshotDownloadStarted {
digest: "digest2".to_string(),
download_id: "download2".to_string(),
size: 2
},
]
);
// Wait for step 3 completion
tokio::time::sleep(Duration::from_millis(10)).await;
assert_eq!(
receiver2.stacked_events(),
vec![
SnapshotDownloadStarted {
digest: "digest1".to_string(),
download_id: "download1".to_string(),
size: 1
},
SnapshotDownloadCompleted {
download_id: "download1".to_string()
},
SnapshotDownloadStarted {
digest: "digest2".to_string(),
download_id: "download2".to_string(),
size: 2
},
SnapshotDownloadCompleted {
download_id: "download2".to_string()
},
SnapshotDownloadStarted {
digest: "digest3".to_string(),
download_id: "download3".to_string(),
size: 3
},
]
);
});
while let Some(res) = join_set.join_next().await {
res.unwrap();
}
assert_eq!(
receiver.stacked_events(),
vec![
SnapshotDownloadStarted {
digest: "digest1".to_string(),
download_id: "download1".to_string(),
size: 1
},
SnapshotDownloadCompleted {
download_id: "download1".to_string()
},
SnapshotDownloadStarted {
digest: "digest2".to_string(),
download_id: "download2".to_string(),
size: 2
},
SnapshotDownloadCompleted {
download_id: "download2".to_string()
},
SnapshotDownloadStarted {
digest: "digest3".to_string(),
download_id: "download3".to_string(),
size: 3
},
SnapshotDownloadCompleted {
download_id: "download3".to_string()
},
]
);
}
}