Make cpu profiling an optional build time configuration.

rtiow/Cargo.toml

@@ -3,6 +3,7 @@ authors = ["Bill Thiede <rust@xinu.tv>"]
 edition = "2018"
 name = "rtiow"
 version = "0.1.0"
+
 [[bench]]
 harness = false
 name = "spheres"
@@ -11,7 +12,7 @@ name = "spheres"
 actix-web = "0.7.8"
 askama = "0.7.1"
 chrono = "*"
-cpuprofiler = "0.0.3"
+cpuprofiler = { version = "0.0.3", optional = true }
 crossbeam-channel = "0.2.4"
 getopts = "*"
 image = "0.19.0"
@@ -27,7 +28,7 @@ structopt = "0.2.10"
 
 [dependencies.prometheus]
 features = ["process", "push"]
-version = "0.5.0"
+version = "0.7.0"
 
 [dev-dependencies]
 criterion = "0.2"
@@ -35,3 +36,6 @@ criterion = "0.2"
 [profile]
 [profile.release]
 debug = true
+
+[features]
+profile = ["cpuprofiler"]

rtiow/src/bin/tracer.rs

@@ -1,6 +1,7 @@
 #[macro_use]
 extern crate log;
 extern crate chrono;
+#[cfg(feature = "profile")]
 extern crate cpuprofiler;
 extern crate rand;
 extern crate rtiow;
@@ -16,6 +17,7 @@ use std::time::Instant;
 
 use chrono::DateTime;
 use chrono::Utc;
+#[cfg(feature = "profile")]
 use cpuprofiler::PROFILER;
 use prometheus::Encoder;
 use structopt::StructOpt;
@@ -62,6 +64,28 @@ fn push_metrics(push_gateway_addr: &str, instance: String, start_time: &DateTime
     }
 }
 
+struct MockTimer;
+
+impl MockTimer {
+    fn start<T: Into<Vec<u8>>>(&self, _: T) -> Result<(), ()> {
+        Ok(())
+    }
+    fn stop(&self) -> Result<(), ()> {
+        Ok(())
+    }
+}
+
+struct MockProfiler;
+
+impl MockProfiler {
+    fn lock(&self) -> Option<MockTimer> {
+        Some(MockTimer {})
+    }
+}
+
+#[cfg(not(feature = "profile"))]
+static PROFILER: MockProfiler = MockProfiler {};
+
 fn main() -> Result<(), std::io::Error> {
     stderrlog::new()
         .verbosity(3)