From 02b6731350868a0078bb8831c768f76a9bd1ebd0 Mon Sep 17 00:00:00 2001
From: David Pedersen <david.pdrsn@gmail.com>
Date: Wed, 27 Jan 2021 23:16:07 +0100
Subject: [PATCH] Only pull in tracing when necessary (#551)

Fixes https://github.com/tower-rs/tower/issues/549

Tested with `cargo hack check --each-feature --no-dev-deps`
---
 tower/CHANGELOG.md |  1 +
 tower/Cargo.toml   | 14 +++++++-------
 2 files changed, 8 insertions(+), 7 deletions(-)

diff --git a/tower/CHANGELOG.md b/tower/CHANGELOG.md
index 7257ff07..d7b1ceca 100644
--- a/tower/CHANGELOG.md
+++ b/tower/CHANGELOG.md
@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 # Unreleased
 
 - **util**: Add `ServiceExt::map_future`. ([#542])
+- `tracing` is now only pulled in for the features that need it.
 
 [#542]: https://github.com/tower-rs/tower/pull/542
 
diff --git a/tower/Cargo.toml b/tower/Cargo.toml
index 1711d6ed..23871e82 100644
--- a/tower/Cargo.toml
+++ b/tower/Cargo.toml
@@ -45,16 +45,16 @@ full = [
 ]
 log = ["tracing/log"]
 balance = ["discover", "load", "ready-cache", "make", "rand", "slab", "tokio-stream"]
-buffer = ["tokio/sync", "tokio/rt", "tokio-stream"]
+buffer = ["tokio/sync", "tokio/rt", "tokio-stream", "tracing"]
 discover = []
 filter = ["futures-util"]
-hedge = ["util", "filter", "futures-util", "hdrhistogram", "tokio/time"]
-limit = ["tokio/time", "tokio/sync"]
-load = ["tokio/time"]
+hedge = ["util", "filter", "futures-util", "hdrhistogram", "tokio/time", "tracing"]
+limit = ["tokio/time", "tokio/sync", "tracing"]
+load = ["tokio/time", "tracing"]
 load-shed = []
 make = ["tokio/io-std"]
-ready-cache = ["futures-util", "indexmap", "tokio/sync"]
-reconnect = ["make", "tokio/io-std"]
+ready-cache = ["futures-util", "indexmap", "tokio/sync", "tracing"]
+reconnect = ["make", "tokio/io-std", "tracing"]
 retry = ["tokio/time"]
 spawn-ready = ["futures-util", "tokio/sync", "tokio/rt", "util"]
 steer = ["futures-util"]
@@ -66,7 +66,6 @@ futures-core = "0.3"
 pin-project = "1"
 tower-layer = { version = "0.3.1", path = "../tower-layer" }
 tower-service = { version = "0.3" }
-tracing = "0.1.2"
 
 futures-util = { version = "0.3", default-features = false, features = ["alloc"], optional = true }
 hdrhistogram = { version = "6.0", optional = true }
@@ -75,6 +74,7 @@ rand = { version = "0.8", features = ["small_rng"], optional = true }
 slab = { version = "0.4", optional = true }
 tokio = { version = "1", optional = true, features = ["sync"] }
 tokio-stream = { version = "0.1.0", optional = true }
+tracing = { version = "0.1.2", optional = true }
 
 [dev-dependencies]
 futures = "0.3"