hopefully finish implementation

.gitignore

@@ -1,2 +1,3 @@
 /target
 **/*.rs.bk
+.idea

Cargo.lock

@@ -1,9 +1,9 @@
 [[package]]
-name = "aho-corasick"
+name = "ansi_term"
-version = "0.6.9"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "memchr 2.1.3 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -53,6 +53,30 @@ name = "cfg-if"
 version = "0.1.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "chrono"
+version = "0.4.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-integer 0.1.39 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "clap"
+version = "2.32.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "ansi_term 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
+ "bitflags 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "textwrap 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
 [[package]]
 name = "cloudabi"
 version = "0.0.3"
@@ -117,15 +141,11 @@ dependencies = [
 ]
 
 [[package]]
-name = "env_logger"
+name = "fern"
-version = "0.6.0"
+version = "0.5.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "atty 0.2.11 (registry+https://github.com/rust-lang/crates.io-index)",
- "humantime 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "regex 1.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
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 [[package]]
@@ -203,14 +223,6 @@ name = "httparse"
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-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
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@@ -297,15 +309,6 @@ dependencies = [
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-[[package]]
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-source = "registry+https://github.com/rust-lang/crates.io-index"
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-
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@@ -365,6 +368,19 @@ name = "nodrop"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "num-integer"
+version = "0.1.39"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "num-traits 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
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@@ -415,13 +431,16 @@ dependencies = [
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 version = "0.1.0"
 dependencies = [
- "env_logger 0.6.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "clap 2.32.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "fern 0.5.7 (registry+https://github.com/rust-lang/crates.io-index)",
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  "hyper 0.12.23 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "log 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
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- "serde_derive 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.87 (registry+https://github.com/rust-lang/crates.io-index)",
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@@ -582,26 +601,6 @@ dependencies = [
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-[[package]]
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-
 [[package]]
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@@ -630,8 +629,11 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "serde"
-version = "1.0.85"
+version = "1.0.87"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "serde_derive 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "serde_derive"
@@ -671,6 +673,11 @@ name = "string"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 
+[[package]]
+name = "strsim"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
 [[package]]
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@@ -681,14 +688,6 @@ dependencies = [
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-[[package]]
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-
 [[package]]
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@@ -700,11 +699,11 @@ dependencies = [
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 [[package]]
-name = "thread_local"
+name = "textwrap"
-version = "0.3.6"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "lazy_static 1.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -890,7 +889,7 @@ name = "toml"
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 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "serde 1.0.85 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde 1.0.87 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -899,8 +898,8 @@ version = "0.2.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
-name = "ucd-util"
+name = "unicode-width"
-version = "0.1.3"
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 [[package]]
@@ -917,8 +916,8 @@ dependencies = [
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 [[package]]
-name = "utf8-ranges"
+name = "vec_map"
-version = "1.0.2"
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 "checksum spin 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "ceac490aa12c567115b40b7b7fceca03a6c9d53d5defea066123debc83c5dc1f"
 "checksum stable_deref_trait 1.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "dba1a27d3efae4351c8051072d619e3ade2820635c3958d826bfea39d59b54c8"
 "checksum string 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "b639411d0b9c738748b5397d5ceba08e648f4f1992231aa859af1a017f31f60b"
+"checksum strsim 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "bb4f380125926a99e52bc279241539c018323fab05ad6368b56f93d9369ff550"
 "checksum syn 0.15.26 (registry+https://github.com/rust-lang/crates.io-index)" = "f92e629aa1d9c827b2bb8297046c1ccffc57c99b947a680d3ccff1f136a3bee9"
-"checksum termcolor 1.0.4 (registry+https://github.com/rust-lang/crates.io-index)" = "4096add70612622289f2fdcdbd5086dc81c1e2675e6ae58d6c4f62a16c6d7f2f"
 "checksum termion 1.5.1 (registry+https://github.com/rust-lang/crates.io-index)" = "689a3bdfaab439fd92bc87df5c4c78417d3cbe537487274e9b0b2dce76e92096"
-"checksum thread_local 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "c6b53e329000edc2b34dbe8545fd20e55a333362d0a321909685a19bd28c3f1b"
+"checksum textwrap 0.10.0 (registry+https://github.com/rust-lang/crates.io-index)" = "307686869c93e71f94da64286f9a9524c0f308a9e1c87a583de8e9c9039ad3f6"
 "checksum time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
 "checksum tokio 0.1.15 (registry+https://github.com/rust-lang/crates.io-index)" = "e0500b88064f08bebddd0c0bed39e19f5c567a5f30975bee52b0c0d3e2eeb38c"
 "checksum tokio-codec 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "5c501eceaf96f0e1793cf26beb63da3d11c738c4a943fdf3746d81d64684c39f"
@@ -1091,17 +1073,15 @@ dependencies = [
 "checksum tokio-uds 0.2.5 (registry+https://github.com/rust-lang/crates.io-index)" = "037ffc3ba0e12a0ab4aca92e5234e0dedeb48fddf6ccd260f1f150a36a9f2445"
 "checksum toml 0.4.10 (registry+https://github.com/rust-lang/crates.io-index)" = "758664fc71a3a69038656bee8b6be6477d2a6c315a6b81f7081f591bffa4111f"
 "checksum try-lock 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "e604eb7b43c06650e854be16a2a03155743d3752dd1c943f6829e26b7a36e382"
-"checksum ucd-util 0.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535c204ee4d8434478593480b8f86ab45ec9aae0e83c568ca81abf0fd0e88f86"
+"checksum unicode-width 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "882386231c45df4700b275c7ff55b6f3698780a650026380e72dabe76fa46526"
 "checksum unicode-xid 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "fc72304796d0818e357ead4e000d19c9c174ab23dc11093ac919054d20a6a7fc"
 "checksum unreachable 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "382810877fe448991dfc7f0dd6e3ae5d58088fd0ea5e35189655f84e6814fa56"
-"checksum utf8-ranges 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "796f7e48bef87609f7ade7e06495a87d5cd06c7866e6a5cbfceffc558a243737"
+"checksum vec_map 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "05c78687fb1a80548ae3250346c3db86a80a7cdd77bda190189f2d0a0987c81a"
 "checksum void 1.0.2 (registry+https://github.com/rust-lang/crates.io-index)" = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
 "checksum want 0.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "797464475f30ddb8830cc529aaaae648d581f99e2036a928877dfde027ddf6b3"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.6 (registry+https://github.com/rust-lang/crates.io-index)" = "92c1eb33641e276cfa214a0522acad57be5c56b10cb348b3c5117db75f3ac4b0"
 "checksum winapi-build 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "2d315eee3b34aca4797b2da6b13ed88266e6d612562a0c46390af8299fc699bc"
 "checksum winapi-i686-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
-"checksum winapi-util 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "7168bab6e1daee33b4557efd0e95d5ca70a03706d39fa5f3fe7a236f584b03c9"
 "checksum winapi-x86_64-pc-windows-gnu 0.4.0 (registry+https://github.com/rust-lang/crates.io-index)" = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
-"checksum wincolor 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "561ed901ae465d6185fa7864d63fbd5720d0ef718366c9a4dc83cf6170d7e9ba"
 "checksum ws2_32-sys 0.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d59cefebd0c892fa2dd6de581e937301d8552cb44489cdff035c6187cb63fa5e"

Cargo.toml

@@ -3,14 +3,18 @@ name = "peshming"
 version = "0.1.0"
 authors = ["Jan Christian Grünhage <jan.christian@gruenhage.xyz>"]
 edition = "2018"
+description = "Pings configured hosts in a configurable intervals and exposes metrics for prometheus."
 
 [dependencies]
 prometheus = "0.5.0"
 oping = "0.3.3"
 toml = "0.4.10"
-serde_derive = "1.0.85"
 hyper = "0.12.23"
 lazy_static = "1.2.0"
 futures = "0.1.25"
 tokio = "0.1.15"
-env_logger = "0.6.0"
+clap = "2.32.0"
+fern = "0.5.7"
+log = "0.4.6"
+chrono = "0.4.6"
+serde = { version = "1.0.87", features = ["derive"] }

config.toml.sample

@@ -0,0 +1,6 @@
+listener = "[::]:9898"
+
+[hosts]
+"1.1.1.1" = 5
+"1.0.0.1" = 5
+

src/README.md

@@ -0,0 +1,28 @@
+## peshming
+It's a prometheus exporter pinging hosts in the background.
+It's been inspired by [meshping](https://bitbucket.org/Svedrin/meshping),
+but instead of managing targets using a redis db this is using a simple config file.
+In addition, this tool allows to set a ping frequency per target.
+
+The name peshming is intended as a placeholder until
+someone comes up with something better.
+
+### Usage:
+```
+peshming 0.1.0
+Jan Christian Grünhage <jan.christian@gruenhage.xyz>
+Pings configured hosts in a configurable intervals and exposes metrics for prometheus.
+
+USAGE:
+    peshming [FLAGS] <config>
+
+FLAGS:
+    -h, --help       Prints help information
+    -v, --verbose    Be verbose (you can add this up to 4 times for more logs)
+    -V, --version    Prints version information
+
+ARGS:
+    <config>    Set config file
+
+```
+For configuration options, see the included sample config file.

src/config.rs

@@ -0,0 +1,73 @@
+use std::collections::HashMap;
+use log::{error, warn, info, debug, trace};
+use serde::{Serialize, Deserialize};
+use clap::{clap_app, crate_name, crate_version, crate_description, crate_authors};
+
+#[derive(Serialize, Deserialize)]
+pub(crate) struct Config {
+    pub(crate) listener: std::net::SocketAddr,
+    pub(crate) hosts: HashMap<String, u64>,
+}
+
+pub(crate) fn setup_clap() -> (clap::ArgMatches<'static>) {
+    clap_app!(myapp =>
+        (name: crate_name!())
+        (version: crate_version!())
+        (author: crate_authors!())
+        (about: crate_description!())
+        (@arg config: +required "Set config file")
+        (@arg v: -v --verbose ... "Be verbose (you can add this up to 4 times for more logs)")
+    ).get_matches()
+}
+
+pub(crate) fn setup_fern(level: u64) {
+    let level = match level {
+        0 => log::LevelFilter::Error,
+        1 => log::LevelFilter::Warn,
+        2 => log::LevelFilter::Info,
+        3 => log::LevelFilter::Debug,
+        _ => log::LevelFilter::Trace
+    };
+    match fern::Dispatch::new()
+        .format(|out, message, record| {
+            out.finish(format_args!(
+                "[{}][{}] {}",
+                chrono::Local::now().format("%Y-%m-%d %H:%M:%S"),
+                record.level(),
+                message
+            ))
+        })
+        .level(level)
+        .chain(std::io::stdout())
+        .apply() {
+        Err(_) => {
+            eprintln!("error setting up logging!");
+        }
+        _ => info!("logging set up properly"),
+    }
+}
+
+pub(crate) fn read_config(path: &str) -> Result<Config, Error> {
+    let config_file_content = std::fs::read_to_string(path)?;
+    Ok(toml::from_str(&config_file_content)?)
+}
+
+pub(crate) struct Error {}
+
+impl std::convert::From<std::io::Error> for Error {
+    fn from(_: std::io::Error) -> Self {
+        Error{}
+    }
+}
+
+impl std::convert::From<toml::de::Error> for Error {
+    fn from(_: toml::de::Error) -> Self {
+        Error{}
+    }
+}
+
+impl std::convert::From<oping::PingError> for Error {
+    fn from(_: oping::PingError) -> Self {
+        Error{}
+    }
+}

src/main.rs

@@ -1,85 +1,27 @@
-extern crate serde_derive;
+use log::{error, warn, info, debug, trace};
-extern crate toml;
-extern crate hyper;
-extern crate lazy_static;
-extern crate prometheus;
-extern crate futures;
-extern crate tokio;
-extern crate env_logger;
-
-use hyper::header::CONTENT_TYPE;
-use hyper::{Body, Request, Response, Server};
-use hyper::rt::Future;
-use hyper::service::service_fn_ok;
-
-use lazy_static::lazy_static;
-
-use prometheus::{Counter, Encoder, Gauge, HistogramVec, TextEncoder};
-use prometheus::*;
-
 use futures::future::lazy;
 
-//TODO: Replace with useful metrics, these are beyond useless
+mod config;
-lazy_static! {
+mod metrics;
-    static ref HTTP_COUNTER: Counter = register_counter!(opts!(
+mod ping;
-        "example_http_requests_total",
+use crate::config::{Config, read_config, setup_clap, setup_fern};
-        "Total number of HTTP requests made.",
+use crate::metrics::start_serving_metrics;
-        labels! {"handler" => "all",}
+use crate::ping::start_pinging_hosts;
-    ))
-    .unwrap();
-    static ref HTTP_BODY_GAUGE: Gauge = register_gauge!(opts!(
-        "example_http_response_size_bytes",
-        "The HTTP response sizes in bytes.",
-        labels! {"handler" => "all",}
-    ))
-    .unwrap();
-    static ref HTTP_REQ_HISTOGRAM: HistogramVec = register_histogram_vec!(
-        "example_http_request_duration_seconds",
-        "The HTTP request latencies in seconds.",
-        &["handler"]
-    )
-    .unwrap();
-}
 
-fn start_serving_metrics() {
+fn main() {
-    let serve_metrics = || {
+    let clap = setup_clap();
-        service_fn_ok(|_req| {
+    setup_fern(clap.occurrences_of("v"));
-            HTTP_COUNTER.inc();
+    let config = match read_config(clap.value_of("config").unwrap()) {
-            let timer = HTTP_REQ_HISTOGRAM.with_label_values(&["all"]).start_timer();
+        Ok(config) => config,
-            let metric_families = prometheus::gather();
+        Err(_) => {
-            let mut buffer = vec![];
+            error!("Couldn't read config file!");
-            let encoder = TextEncoder::new();
+            return;
-            encoder.encode(&metric_families, &mut buffer).unwrap();
+        }
-            HTTP_BODY_GAUGE.set(buffer.len() as f64);
-            let mut res = Response::new(Body::from(buffer));
-            res.headers_mut().insert(CONTENT_TYPE, encoder.format_type().parse().unwrap());
-            timer.observe_duration();
-            res
-        })
     };
-    println!("listening addr 127.0.0.1:9898");
-    let server = Server::bind(&([127, 0, 0, 1], 9898).into())
-        .serve(serve_metrics)
-        .map_err(|err| eprintln!("server error: {}", err));
-    tokio::spawn(server);
-}
 
-fn start_pinging_hosts() {
+    tokio::run(lazy(move || {
-    tokio::spawn(lazy(|| {
+        start_serving_metrics(&config);
-        //TODO: Implement the pinging, based on oping and the example over at
+        start_pinging_hosts(&config);
-        //      https://tokio.rs/docs/futures/spawning/
-        Ok(())
-    }));
-}
-    //TODO: Clean this shameful mess up!
-    //TODO: Do config reading, cli args, logging etc
-
-
-fn main() {
-    env_logger::init();
-    tokio::run(lazy(|| {
-        start_serving_metrics();
-        start_pinging_hosts();
         Ok(())
     }));
 }

src/metrics.rs

@@ -0,0 +1,51 @@
+use crate::config::{Config};
+use lazy_static::lazy_static;
+use hyper::{Server, Response, Body, header::CONTENT_TYPE, service::service_fn_ok};
+use prometheus::{TextEncoder, Counter, Gauge, HistogramVec};
+use prometheus::*;
+
+use futures::future::Future;
+
+lazy_static! {
+    static ref HTTP_COUNTER: Counter = register_counter!(opts!(
+        "http_requests_total",
+        "Total number of HTTP requests made.",
+        labels! {"handler" => "all",}
+    ))
+    .unwrap();
+    static ref HTTP_BODY_GAUGE: Gauge = register_gauge!(opts!(
+        "http_response_size_bytes",
+        "The HTTP response sizes in bytes.",
+        labels! {"handler" => "all",}
+    ))
+    .unwrap();
+    static ref HTTP_REQ_HISTOGRAM: HistogramVec = register_histogram_vec!(
+        "http_request_duration_seconds",
+        "The HTTP request latencies in seconds.",
+        &["handler"]
+    )
+    .unwrap();
+}
+
+pub(crate) fn start_serving_metrics(config: &Config) {
+    let serve_metrics = || {
+        service_fn_ok(|_req| {
+            HTTP_COUNTER.inc();
+            let timer = HTTP_REQ_HISTOGRAM.with_label_values(&["all"]).start_timer();
+            let metric_families = prometheus::gather();
+            let mut buffer = vec![];
+            let encoder = TextEncoder::new();
+            encoder.encode(&metric_families, &mut buffer).unwrap();
+            HTTP_BODY_GAUGE.set(buffer.len() as f64);
+            let mut res = Response::new(Body::from(buffer));
+            res.headers_mut().insert(CONTENT_TYPE, encoder.format_type().parse().unwrap());
+            timer.observe_duration();
+            res
+        })
+    };
+    println!("Listening on {}", &config.listener);
+    let server = Server::bind(&config.listener)
+        .serve(serve_metrics)
+        .map_err(|err| eprintln!("server error: {}", err));
+    tokio::spawn(server);
+}

src/ping.rs

@@ -0,0 +1,55 @@
+use crate::config::{Config, Error};
+use std::time::{Duration, Instant};
+use tokio::timer::{Interval};
+use futures::{future::{lazy, Future}, stream::Stream};
+use oping::{Ping};
+use log::{trace, debug, info, warn, error};
+use prometheus::*;
+use lazy_static::lazy_static;
+
+lazy_static! {
+    static ref PING_HISTOGRAM : HistogramVec = register_histogram_vec!(
+        "ping_rtt_milliseconds",
+        "The ping round trip time in milliseconds",
+        &["target"],
+        vec![0.5, 1.0, 5.0, 10.0, 15.0, 20.0, 25.0, 50.0, 75.0, 100.0, 150.0, 200.0, 250.0,
+        300.0, 350.0, 400.0, 450.0, 500.0, 550.0, 600.0, 650.0, 700.0, 750.0, 800.0, 900.0,
+        1000.0, 1250.0, 1500.0, 1750.0, 2000.0]
+    ).unwrap();
+}
+
+pub(crate) fn start_pinging_hosts(config: &Config) {
+    for (host, interval) in config.hosts.clone() {
+        info!("Spawn ping task for {}", host);
+        tokio::spawn(
+            Interval::new(Instant::now(), Duration::from_millis(interval))
+                .for_each(move |_| {
+                    let mut ping = Ping::new();
+                    ping.set_timeout(2.5);
+                    ping.add_host(&host);
+                    for response in match ping.send() {
+                        Ok(iterator) => iterator,
+                        Err(e) => {
+                            error!("Something went wrong sending the ping: {:?}", e);
+                            return Ok(());
+                        }
+                    }{
+                        if response.dropped > 0 {
+                            debug!("No response from host: {}", response.hostname);
+                            PING_HISTOGRAM
+                                .with_label_values(&[&host])
+                                .observe(2500.0)
+                        } else {
+                            debug!("Response from host {} (address {}): latency {} ms",
+                                     response.hostname, response.address, response.latency_ms);
+                            trace!("    all details: {:?}", response);
+                            PING_HISTOGRAM
+                                .with_label_values(&[&host])
+                                .observe(response.latency_ms);
+                        }
+                    }
+                    Ok(())
+                }).map_err(|_| ())
+        );
+    }
+}