From 96f6c3e30b28bf3b35296fc3cfda5cc366903c26 Mon Sep 17 00:00:00 2001 From: Louis-Vincent Date: Thu, 2 Jan 2025 16:25:43 -0500 Subject: [PATCH] added more examples to use lock and log --- .gitignore | 2 +- example/Cargo.lock | 1272 +++++++++++++++++++++++++ example/Cargo.toml | 19 + example/src/bin/example-lock.rs | 50 + example/src/bin/example-log.rs | 84 ++ example/src/bin/example-scope-with.rs | 50 + src/log.rs | 2 - 7 files changed, 1476 insertions(+), 3 deletions(-) create mode 100644 example/Cargo.lock create mode 100644 example/Cargo.toml create mode 100644 example/src/bin/example-lock.rs create mode 100644 example/src/bin/example-log.rs create mode 100644 example/src/bin/example-scope-with.rs diff --git a/.gitignore b/.gitignore index ea8c4bf..1de5659 100644 --- a/.gitignore +++ b/.gitignore @@ -1 +1 @@ -/target +target \ No newline at end of file diff --git a/example/Cargo.lock b/example/Cargo.lock new file mode 100644 index 0000000..24424bc --- /dev/null +++ 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+version = "0.7.35" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e" +dependencies = [ + "proc-macro2", + "quote", + "syn", +] diff --git a/example/Cargo.toml b/example/Cargo.toml new file mode 100644 index 0000000..c479212 --- /dev/null +++ b/example/Cargo.toml @@ -0,0 +1,19 @@ +[package] +name = "example" +version = "0.1.0" +edition = "2021" + +[dependencies] +rust-etcd-utils = { path = "../" } +async-trait = "0.1.83" +etcd-client = "0.14.0" +futures = "0.3.31" +rand = "0.8.5" +retry = "2.0.0" +serde = { version = "1.0.215", features = ["derive"] } +serde_json = "1.0.133" +thiserror = "2.0.3" +tokio = { version = "1.38.0", features = ["rt-multi-thread", "time", "sync", "signal"] } +tokio-stream = "0.1.16" +tonic = "0.12.3" +tracing = "0.1.40" \ No newline at end of file diff --git a/example/src/bin/example-lock.rs b/example/src/bin/example-lock.rs new file mode 100644 index 0000000..f4790cd --- /dev/null +++ b/example/src/bin/example-lock.rs @@ -0,0 +1,50 @@ +use core::time::Duration; + +use futures::lock; +use rust_etcd_utils::{lease::ManagedLeaseFactory, lock::spawn_lock_manager}; + +#[tokio::main] +async fn main() { + let etcd = etcd_client::Client::connect(["http://localhost:2379"], None) + .await + .expect("failed to connect to etcd"); + + let lease_duration = Duration::from_secs(2); + let managed_lease_factory = ManagedLeaseFactory::new(etcd.clone()); + let (lock_man_handle, lock_manager) = spawn_lock_manager(etcd.clone(), managed_lease_factory); + + let lock_name = "example-lock"; + + // Managed lock are RAII guards that automatically release the lock when they are dropped. + let my_managed_lock = lock_manager + .lock(lock_name, lease_duration) + .await + .expect("failed to lock"); + + let lock_manager2 = lock_manager.clone(); + let h = tokio::spawn(async move { + lock_manager2 + .lock("example-lock", lease_duration) + .await + .expect("failed to lock"); + println!("Lock acquired in task 2!"); + }); + + println!("Lock acquired in main task!"); + + println!("Sleeping for 5 second..."); + for i in 1..=5 { + println!("{}...", i); + tokio::time::sleep(Duration::from_secs(1)).await; + } + + println!("Dropping managed lock!"); + drop(my_managed_lock); + + println!("Waiting for task 2 to acquire lock..."); + h.await.expect("task 2 failed to acquire lock"); + + drop(lock_manager); + lock_man_handle.await.expect("lock manager failed"); + println!("Finished!"); +} diff --git a/example/src/bin/example-log.rs b/example/src/bin/example-log.rs new file mode 100644 index 0000000..7746ddd --- /dev/null +++ b/example/src/bin/example-log.rs @@ -0,0 +1,84 @@ +use core::time::Duration; + +use rust_etcd_utils::{ + lease::ManagedLeaseFactory, + lock::spawn_lock_manager, + log::{ExclusiveLogUpdater, LogWatcher}, +}; +use serde::{Deserialize, Serialize}; + +#[derive(Debug, Clone, Serialize, Deserialize)] +struct DummyValue { + value: i32, +} + +/// +/// This example shows how to create a "protected" or "exclusive-writer" log in etcd where you update a key using put operations only. +/// +/// The log is protected by a lock, which is acquired by the writer before updating the log. +/// The type system ensures that the lock is held when updating the log by forcing the user to use the `scope_with` method. +/// +#[tokio::main] +async fn main() { + let etcd = etcd_client::Client::connect(["http://localhost:2379"], None) + .await + .expect("failed to connect to etcd"); + + let lease_duration = Duration::from_secs(2); + let managed_lease_factory = ManagedLeaseFactory::new(etcd.clone()); + let (_lock_man_handle, lock_manager) = spawn_lock_manager(etcd.clone(), managed_lease_factory); + + let lock_name = "example-lock"; + + // Managed lock are RAII guards that automatically release the lock when they are dropped. + let my_managed_lock = lock_manager + .lock(lock_name, lease_duration) + .await + .expect("failed to lock"); + + let lock_key = my_managed_lock.get_key(); + let writer_handle = tokio::spawn(async move { + println!("Lock acquired in subtask!"); + // As + my_managed_lock + .scope_with(|guard| async move { + let mut updater = + ExclusiveLogUpdater::::with_scope("example-log", guard) + .await + .expect("failed to create log updater"); + let mut i = 0; + loop { + tokio::time::sleep(Duration::from_secs(1)).await; + updater + .write(DummyValue { value: i }) + .await + .expect("failed to update log"); + i += 1; + } + }) + .await + }); + let mut log_watcher = LogWatcher::::new(etcd.clone(), "example-log") + .await + .expect("failed to create log watcher"); + let _reader_handle = tokio::spawn(async move { + loop { + let val = log_watcher.observe().await.expect("failed to read log"); + println!("Received value: {:?}", val); + } + }); + + println!("Press Ctrl-C to delete the lock lease and abort `scope_with` loop"); + let _ = tokio::signal::ctrl_c().await; + + // You don't want to drop the key manually like this, this is just for demonstration purposes. + let _ = etcd + .kv_client() + .delete(lock_key, None) + .await + .expect("failed to delete lock key"); + + let _ = writer_handle.await; + + println!("Finished!"); +} diff --git a/example/src/bin/example-scope-with.rs b/example/src/bin/example-scope-with.rs new file mode 100644 index 0000000..b810bbf --- /dev/null +++ b/example/src/bin/example-scope-with.rs @@ -0,0 +1,50 @@ +use core::time::Duration; + +use rust_etcd_utils::{lease::ManagedLeaseFactory, lock::spawn_lock_manager}; + +#[tokio::main] +async fn main() { + let etcd = etcd_client::Client::connect(["http://localhost:2379"], None) + .await + .expect("failed to connect to etcd"); + + let lease_duration = Duration::from_secs(2); + let managed_lease_factory = ManagedLeaseFactory::new(etcd.clone()); + let (_lock_man_handle, lock_manager) = spawn_lock_manager(etcd.clone(), managed_lease_factory); + + let lock_name = "example-lock"; + + let my_managed_lock = lock_manager + .lock(lock_name, lease_duration) + .await + .expect("failed to lock"); + + let lock_key = my_managed_lock.get_key(); + let h = tokio::spawn(async move { + println!("Lock acquired in subtask!"); + // If you need to run something as long as the lock is held, you can use `scope_with` method. + my_managed_lock + .scope_with(|_guard| async move { + let now = tokio::time::Instant::now(); + loop { + tokio::time::sleep(Duration::from_secs(1)).await; + println!("Subtask is still running after {:?}", now.elapsed()); + } + }) + .await + }); + + println!("Press Ctrl-C to delete the lock lease and abort `scope_with` loop"); + let _ = tokio::signal::ctrl_c().await; + + // You don't want to drop the key manually like this, this is just for demonstration purposes. + let _ = etcd + .kv_client() + .delete(lock_key, None) + .await + .expect("failed to delete lock key"); + + let _ = h.await; + + println!("Finished!"); +} diff --git a/src/log.rs b/src/log.rs index 2e495d8..2ab6b15 100644 --- a/src/log.rs +++ b/src/log.rs @@ -1,5 +1,3 @@ -use std::future::IntoFuture; - use etcd_client::{Compare, CompareOp, Txn, TxnOp, WatchOptions}; use serde::{de::DeserializeOwned, Serialize};