feat: add background to advanced subscriber

Cargo.toml

@@ -136,6 +136,7 @@ quote = "1.0.37"
 rand = { version = "0.8.5", default-features = false } # Default features are disabled due to usage in no_std crates
 rand_chacha = "0.3.1"
 rcgen = "0.13.1"
+ref-cast = "1.0.23"
 regex = "1.10.6"
 ron = "0.8.1"
 ringbuffer-spsc = "0.1.9"

commons/zenoh-config/src/wrappers.rs

@@ -152,6 +152,16 @@ pub struct EntityGlobalId(EntityGlobalIdProto);
 pub type EntityId = u32;
 
 impl EntityGlobalId {
+    /// Creates a new EntityGlobalId.
+    #[zenoh_macros::internal]
+    pub fn new(zid: ZenohId, eid: EntityId) -> Self {
+        EntityGlobalIdProto {
+            zid: zid.into(),
+            eid,
+        }
+        .into()
+    }
+
     /// Returns the [`ZenohId`], i.e. the Zenoh session, this ID is associated to.
     pub fn zid(&self) -> ZenohId {
         self.0.zid.into()

commons/zenoh-macros/src/lib.rs

@@ -515,7 +515,7 @@ pub fn ke(tokens: TokenStream) -> TokenStream {
     let value: LitStr = syn::parse(tokens).unwrap();
     let ke = value.value();
     match zenoh_keyexpr::keyexpr::new(&ke) {
-        Ok(_) => quote!(unsafe {::zenoh::key_expr::keyexpr::from_str_unchecked(#ke)}).into(),
+        Ok(_) => quote!(unsafe { zenoh::key_expr::keyexpr::from_str_unchecked(#ke)}).into(),
         Err(e) => panic!("{}", e),
     }
 }

zenoh-ext/Cargo.toml

@@ -38,14 +38,16 @@ tokio = { workspace = true, features = [
   "macros",
   "io-std",
 ] }
+async-trait = { workspace = true }
 bincode = { workspace = true }
 zenoh-util = { workspace = true }
 flume = { workspace = true }
 futures = { workspace = true }
 tracing = { workspace = true }
 serde = { workspace = true, features = ["default"] }
 leb128 = { workspace = true }
-zenoh = { workspace = true, default-features = false }
+uhlc = { workspace = true }
+zenoh = { workspace = true, features = ["default"] }
 zenoh-macros = { workspace = true }
 
 [dev-dependencies]

zenoh-ext/examples/Cargo.toml

@@ -42,12 +42,12 @@ zenoh-ext = { workspace = true, features = ["unstable"] }
 zenoh-config = { workspace = true }
 
 [[example]]
-name = "z_query_sub"
-path = "examples/z_query_sub.rs"
+name = "z_advanced_pub"
+path = "examples/z_advanced_pub.rs"
 
 [[example]]
-name = "z_pub_cache"
-path = "examples/z_pub_cache.rs"
+name = "z_advanced_sub"
+path = "examples/z_advanced_sub.rs"
 
 [[example]]
 name = "z_member"

zenoh-ext/examples/examples/README.md

@@ -15,31 +15,33 @@
 
 ## Examples description
 
-### z_pub_cache
+### z_advanced_pub
 
-   Declares a publisher and an associated publication cache with a given key expression.  
-   All the publications are locally cached (with a configurable history size - i.e. max number of cached data per resource). The cache can be queried by a QueryingSubscriber at startup (see next example).
+   Declares an AdvancedPublisher with a given key expression.  
+   All the publications are locally cached (with a configurable history size - i.e. max number of cached data per resource, default 1). The cache can be queried by an AdvancedSubscriber for hsitory
+   or retransmission.
 
    Typical usage:
    ```bash
-      z_pub_cache
+      z_advanced_pub
    ```
    or
    ```bash
-      z_pub_cache --history 10
+      z_advanced_pub --history 10
    ```
 
-### z_query_sub
+### z_advanced_sub
 
-   Declares a querying subscriber with a selector.  
-   At startup, the subscriber issuez a query (by default on the same selector than the subscription) and merge/sort/de-duplicate the query results with the publications received in parallel.
+   Declares an AdvancedSubscriber with a given key expression.  
+   The AdvancedSubscriber can query for AdvancedPublisher history at startup
+   and on late joiner publisher detection. The AdvancedSubscriber can detect
+   sample loss and ask for retransmission.
 
    Typical usage:
    ```bash
-      z_query_sub
+      z_advanced_sub
    ```
 
-
 ### z_member
 
    Group Management example: join a group and display the received group events (Join, Leave, LeaseExpired), as well as an updated group view.

zenoh-ext/examples/examples/z_pub_cache.rs → zenoh-ext/examples/examples/z_advanced_pub.rs

@@ -1,3 +1,5 @@
+use std::time::Duration;
+
 //
 // Copyright (c) 2023 ZettaScale Technology
 //
@@ -11,40 +13,37 @@
 // Contributors:
 //   ZettaScale Zenoh Team, <[email protected]>
 //
-use std::time::Duration;
-
 use clap::{arg, Parser};
 use zenoh::{config::Config, key_expr::KeyExpr};
 use zenoh_config::ModeDependentValue;
-use zenoh_ext::*;
+use zenoh_ext::{AdvancedPublisherBuilderExt, CacheConfig};
 use zenoh_ext_examples::CommonArgs;
 
 #[tokio::main]
 async fn main() {
     // Initiate logging
     zenoh::init_log_from_env_or("error");
 
-    let (config, key_expr, value, history, prefix, complete) = parse_args();
+    let (config, key_expr, value, history) = parse_args();
 
     println!("Opening session...");
     let session = zenoh::open(config).await.unwrap();
 
-    println!("Declaring PublicationCache on {}", &key_expr);
-    let mut publication_cache_builder = session
-        .declare_publication_cache(&key_expr)
-        .history(history)
-        .queryable_complete(complete);
-    if let Some(prefix) = prefix {
-        publication_cache_builder = publication_cache_builder.queryable_prefix(prefix);
-    }
-    let _publication_cache = publication_cache_builder.await.unwrap();
+    println!("Declaring AdvancedPublisher on {}", &key_expr);
+    let publisher = session
+        .declare_publisher(&key_expr)
+        .cache(CacheConfig::default().max_samples(history))
+        .sample_miss_detection()
+        .publisher_detection()
+        .await
+        .unwrap();
 
     println!("Press CTRL-C to quit...");
     for idx in 0..u32::MAX {
         tokio::time::sleep(Duration::from_secs(1)).await;
         let buf = format!("[{idx:4}] {value}");
         println!("Put Data ('{}': '{}')", &key_expr, buf);
-        session.put(&key_expr, buf).await.unwrap();
+        publisher.put(buf).await.unwrap();
     }
 }
 
@@ -59,36 +58,16 @@ struct Args {
     #[arg(short = 'i', long, default_value = "1")]
     /// The number of publications to keep in cache.
     history: usize,
-    #[arg(short = 'o', long)]
-    /// Set `complete` option to true. This means that this queryable is ultimate data source, no need to scan other queryables.
-    complete: bool,
-    #[arg(short = 'x', long)]
-    /// An optional queryable prefix.
-    prefix: Option<String>,
     #[command(flatten)]
     common: CommonArgs,
 }
 
-fn parse_args() -> (
-    Config,
-    KeyExpr<'static>,
-    String,
-    usize,
-    Option<String>,
-    bool,
-) {
+fn parse_args() -> (Config, KeyExpr<'static>, String, usize) {
     let args = Args::parse();
     let mut config: Config = args.common.into();
     config
         .timestamping
         .set_enabled(Some(ModeDependentValue::Unique(true)))
         .unwrap();
-    (
-        config,
-        args.key,
-        args.value,
-        args.history,
-        args.prefix,
-        args.complete,
-    )
+    (config, args.key, args.value, args.history)
 }

zenoh-ext/examples/examples/z_advanced_sub.rs

@@ -0,0 +1,84 @@
+//
+// Copyright (c) 2023 ZettaScale Technology
+//
+// This program and the accompanying materials are made available under the
+// terms of the Eclipse Public License 2.0 which is available at
+// http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
+// which is available at https://www.apache.org/licenses/LICENSE-2.0.
+//
+// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
+//
+// Contributors:
+//   ZettaScale Zenoh Team, <[email protected]>
+//
+use std::time::Duration;
+
+use clap::{arg, Parser};
+use zenoh::config::Config;
+use zenoh_ext::{AdvancedSubscriberBuilderExt, HistoryConfig, RecoveryConfig};
+use zenoh_ext_examples::CommonArgs;
+
+#[tokio::main]
+async fn main() {
+    // Initiate logging
+    zenoh::init_log_from_env_or("error");
+
+    let (config, key_expr) = parse_args();
+
+    println!("Opening session...");
+    let session = zenoh::open(config).await.unwrap();
+
+    println!("Declaring AdvancedSubscriber on {}", key_expr);
+    let subscriber = session
+        .declare_subscriber(key_expr)
+        .history(HistoryConfig::default().detect_late_publishers())
+        .recovery(RecoveryConfig::default().periodic_queries(Some(Duration::from_secs(1))))
+        .subscriber_detection()
+        .await
+        .unwrap();
+
+    let miss_listener = subscriber.sample_miss_listener().await.unwrap();
+
+    println!("Press CTRL-C to quit...");
+    loop {
+        tokio::select! {
+            sample = subscriber.recv_async() => {
+                if let Ok(sample) = sample {
+                    let payload = sample
+                        .payload()
+                        .try_to_string()
+                        .unwrap_or_else(|e| e.to_string().into());
+                    println!(
+                        ">> [Subscriber] Received {} ('{}': '{}')",
+                        sample.kind(),
+                        sample.key_expr().as_str(),
+                        payload
+                    );
+                }
+            },
+            miss = miss_listener.recv_async() => {
+                if let Ok(miss) = miss {
+                    println!(
+                        ">> [Subscriber] Missed {} samples from {:?} !!!",
+                        miss.nb(),
+                        miss.source()
+                    );
+                }
+            },
+        }
+    }
+}
+
+#[derive(clap::Parser, Clone, PartialEq, Eq, Hash, Debug)]
+struct Args {
+    #[arg(short, long, default_value = "demo/example/**")]
+    /// The key expression to subscribe onto.
+    key: String,
+    #[command(flatten)]
+    common: CommonArgs,
+}
+
+fn parse_args() -> (Config, String) {
+    let args = Args::parse();
+    (args.common.into(), args.key)
+}