makes zmq optional dep

Cargo.toml

@@ -6,14 +6,14 @@ authors = ["Jonathan Strong <jonathan.strong@gmail.com>"]
 [[example]]
 name = "zmq-logger"
 path = "examples/zmq-logger.rs"
-required-features = ["warnings"]
+required-features = ["warnings", "zmq"]
 
 [[example]]
 name = "hist-interval"
 path = "examples/hist-interval.rs"
 
 [dependencies]
-zmq = "0.8"
+zmq = { version = "0.8", optional = true }
 influent = "0.4"
 chrono = { version = "0.4", features = ["serde"] }
 hyper = "0.10"

src/influx.rs

@@ -15,6 +15,7 @@ use hyper::client::response::Response;
 use hyper::Url;
 use hyper::client::Client;
 use influent::measurement::{Measurement, Value};
+#[cfg(feature = "zmq")]
 use zmq;
 #[allow(unused_imports)]
 use chrono::{DateTime, Utc};
@@ -398,8 +399,10 @@ impl Drop for InfluxWriter {
     }
 }
 
+#[cfg(feature = "zmq")]
 const WRITER_ADDR: &'static str = "ipc:///tmp/mm/influx";
 
+#[cfg(feature = "zmq")]
 pub fn pull(ctx: &zmq::Context) -> Result<zmq::Socket, zmq::Error> {
     let socket = ctx.socket(zmq::PULL)?;
     socket.bind(WRITER_ADDR)?;
@@ -407,6 +410,7 @@ pub fn pull(ctx: &zmq::Context) -> Result<zmq::Socket, zmq::Error> {
     Ok(socket)
 }
 
+#[cfg(feature = "zmq")]
 pub fn push(ctx: &zmq::Context) -> Result<zmq::Socket, zmq::Error> {
     let socket = ctx.socket(zmq::PUSH)?;
     socket.connect(WRITER_ADDR)?;
@@ -583,6 +587,7 @@ pub fn serialize_owned(measurement: &OwnedMeasurement, line: &mut String) {
 
 #[cfg(feature = "warnings")]
 #[deprecated(since="0.4", note="Replace with InfluxWriter")]
+#[cfg(feature = "zmq")]
 pub fn writer(warnings: Sender<Warning>) -> thread::JoinHandle<()> {
     assert!(false);
     thread::Builder::new().name("mm:inflx-wtr".into()).spawn(move || {
@@ -998,6 +1003,7 @@ mod tests {
         });
     }
 
+    #[cfg(feature = "zmq")]
     #[cfg(feature = "warnings")]
     #[test]
     #[ignore]

src/latency.rs

@@ -647,7 +647,6 @@ impl LatencyManager {
 
         let thread = Some(thread::spawn(move || { 
             let logger = file_logger("var/log/latency-manager.log", Severity::Info);
-            info!(logger, "initializing zmq");
 
             info!(logger, "initializing DurationWindows");
             let mut gdax_ws = windows::DurationWindow::new(d);

src/lib.rs

@@ -9,7 +9,6 @@
 #[macro_use] extern crate money;
 
 extern crate test;
-extern crate zmq;
 extern crate influent;
 extern crate chrono;
 extern crate hyper;
@@ -24,6 +23,8 @@ extern crate uuid;
 extern crate hdrhistogram;
 extern crate smallvec;
 extern crate num;
+#[cfg(feature = "zmq")]
+extern crate zmq;
 
 extern crate pubsub as pub_sub;
 

src/warnings.rs

@@ -9,6 +9,7 @@ use std::fmt::{self, Display, Error as FmtError, Formatter};
 use std::io::{self, Write};
 use std::fs;
 
+#[cfg(feature = "zmq")]
 use zmq;
 use chrono::{DateTime, Utc};
 use termion::color::{self, Fg, Bg};
@@ -417,6 +418,7 @@ impl WarningsManager {
     /// `measurement_name` is the name of the influxdb measurement
     /// we will save log entries to.
     ///
+    #[cfg(feature = "zmq")]
     pub fn new(measurement_name: &'static str) -> Self {
         let warnings = Arc::new(RwLock::new(VecDeque::new()));
         let warnings_copy = warnings.clone();
@@ -486,6 +488,7 @@ impl Drop for WarningsManager {
     }
 }
 
+#[cfg(feature = "zmq")]
 #[allow(dead_code)]
 pub struct ZmqDrain<D>
     where D: Drain,
@@ -496,6 +499,7 @@ pub struct ZmqDrain<D>
     buf: Arc<Mutex<Vec<u8>>>
 }
 
+#[cfg(feature = "zmq")]
 impl<D> ZmqDrain<D> 
     where D: Drain,
 {
@@ -517,6 +521,7 @@ impl<D> ZmqDrain<D>
 
 const TIMESTAMP_FORMAT: &'static str = "%b %d %H:%M:%S%.3f";
 
+#[cfg(feature = "zmq")]
 impl<D> Drain for ZmqDrain<D> 
     where D: Drain
 {
@@ -557,6 +562,7 @@ impl<D> Drain for ZmqDrain<D>
 /// Can be used as a `Write` with `slog_term` and
 /// other libraries. 
 ///
+#[cfg(feature = "zmq")]
 #[allow(dead_code)]
 pub struct ZmqIo {
     ctx: zmq::Context,
@@ -564,6 +570,7 @@ pub struct ZmqIo {
     buf: Vec<u8>
 }
 
+#[cfg(feature = "zmq")]
 impl ZmqIo {
     pub fn new(addr: &str) -> Self {
         let _ = fs::create_dir("/tmp/mm");
@@ -576,6 +583,7 @@ impl ZmqIo {
     }
 }
 
+#[cfg(feature = "zmq")]
 impl Write for ZmqIo {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
         self.buf.write(buf)