chore(metrics): move example to examples/

Related: #3111.

Pull-Request: #3661.

Cargo.lock

@@ -2580,24 +2580,16 @@ dependencies = [
 name = "libp2p-metrics"
 version = "0.12.0"
 dependencies = [
- "env_logger 0.10.0",
- "futures",
- "hyper",
  "libp2p-core",
  "libp2p-dcutr",
  "libp2p-gossipsub",
  "libp2p-identify",
  "libp2p-identity",
  "libp2p-kad",
- "libp2p-noise",
  "libp2p-ping",
  "libp2p-relay",
  "libp2p-swarm",
- "libp2p-tcp",
- "libp2p-yamux",
- "log",
  "prometheus-client",
- "tokio",
 ]
 
 [[package]]
@@ -3194,6 +3186,19 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "metrics-example"
+version = "0.1.0"
+dependencies = [
+ "env_logger 0.10.0",
+ "futures",
+ "hyper",
+ "libp2p",
+ "log",
+ "prometheus-client",
+ "tokio",
+]
+
 [[package]]
 name = "minimal-lexical"
 version = "0.2.1"

Cargo.toml

@@ -9,6 +9,7 @@ members = [
     "examples/identify",
     "examples/ipfs-kad",
     "examples/ipfs-private",
+    "examples/metrics",
     "examples/ping-example",
     "examples/relay-server",
     "examples/rendezvous",

examples/metrics/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "metrics-example"
+version = "0.1.0"
+edition = "2021"
+publish = false
+license = "MIT"
+
+[dependencies]
+env_logger = "0.10.0"
+futures = "0.3.27"
+hyper = { version = "0.14", features = ["server", "tcp", "http1"] }
+libp2p = { path = "../../libp2p", features = ["async-std", "metrics", "ping", "noise", "identify", "tcp", "yamux", "macros"] }
+log = "0.4.0"
+tokio = { version = "1", features = ["rt-multi-thread"] }
+prometheus-client = "0.19.0"

examples/metrics/src/main.rs

@@ -23,13 +23,13 @@
 //! In one terminal run:
 //!
 //! ```
-//! cargo run --example metrics
+//! cargo run
 //! ```
 //!
 //! In a second terminal run:
 //!
 //! ```
-//! cargo run --example metrics -- <listen-addr-of-first-node>
+//! cargo run -- <listen-addr-of-first-node>
 //! ```
 //!
 //! Where `<listen-addr-of-first-node>` is replaced by the listen address of the
@@ -51,16 +51,11 @@
 use env_logger::Env;
 use futures::executor::block_on;
 use futures::stream::StreamExt;
-use libp2p_core::{upgrade::Version, Multiaddr, Transport};
-use libp2p_identify as identify;
-use libp2p_identity as identity;
-use libp2p_identity::PeerId;
-use libp2p_metrics::{Metrics, Recorder};
-use libp2p_noise as noise;
-use libp2p_ping as ping;
-use libp2p_swarm::{keep_alive, NetworkBehaviour, SwarmBuilder, SwarmEvent};
-use libp2p_tcp as tcp;
-use libp2p_yamux as yamux;
+use libp2p::core::{upgrade::Version, Multiaddr, Transport};
+use libp2p::identity::PeerId;
+use libp2p::metrics::{Metrics, Recorder};
+use libp2p::swarm::{keep_alive, NetworkBehaviour, SwarmBuilder, SwarmEvent};
+use libp2p::{identify, identity, noise, ping, tcp, yamux};
 use log::info;
 use prometheus_client::registry::Registry;
 use std::error::Error;
@@ -125,7 +120,6 @@ fn main() -> Result<(), Box<dyn Error>> {
 /// For illustrative purposes, this includes the [`keep_alive::Behaviour`]) behaviour so the ping actually happen
 /// and can be observed via the metrics.
 #[derive(NetworkBehaviour)]
-#[behaviour(prelude = "libp2p_swarm::derive_prelude")]
 struct Behaviour {
     identify: identify::Behaviour,
     keep_alive: keep_alive::Behaviour,

misc/metrics/Cargo.toml

@@ -32,25 +32,9 @@ prometheus-client = "0.19.0"
 [target.'cfg(not(target_os = "unknown"))'.dependencies]
 libp2p-gossipsub =  { version = "0.44.0", path = "../../protocols/gossipsub", optional = true }
 
-[dev-dependencies]
-env_logger = "0.10.0"
-futures = "0.3.28"
-hyper = { version="0.14", features = ["server", "tcp", "http1"] }
-libp2p-noise = { path = "../../transports/noise" }
-libp2p-ping = { path = "../../protocols/ping" }
-libp2p-swarm = { path = "../../swarm", features = ["macros"] }
-libp2p-tcp = { path = "../../transports/tcp", features = ["async-io"] }
-libp2p-yamux = { path = "../../muxers/yamux" }
-log = "0.4.0"
-tokio = { version = "1", features = ["rt-multi-thread"] }
-
 # Passing arguments to the docsrs builder in order to properly document cfg's.
 # More information: https://docs.rs/about/builds#cross-compiling
 [package.metadata.docs.rs]
 all-features = true
 rustdoc-args = ["--cfg", "docsrs"]
 rustc-args = ["--cfg", "docsrs"]
-
-[[example]]
-name = "metrics"
-required-features = ["ping", "identify"]