Take advantage of weak features in Rust 1.60 for TLS enablement

Previously it was impossible to have a unified feature named `rustls` or
`native-tls` that would turn on the respective TLS backend in the chosen
transport (`reqwest` or `ureq`) as a feature of `<crate>/tls` would
implicitly turn on `<crate>`.  Since Rust 1.60 it is now possible to
specify this crate-feature enablement through the use of the question
mark in `<crate>?/tls`, which will only enable the `tls` feature if
`<crate>` was enabled through other means (another feature).

Secondly we can now also let optional crates have the same name as a
feature, and use `dep:<crate>` to refer to the crate instead of the
dependency, making for a more pleasant experience without renames to
underscore suffixes.

sentry/Cargo.toml

@@ -11,6 +11,7 @@ Sentry (getsentry.com) client for rust ;)
 """
 edition = "2018"
 autoexamples = true
+rust-version = "1.54.0"
 
 # To build locally:
 # RUSTDOCFLAGS="--cfg doc_cfg" cargo +nightly doc --all-features --open
@@ -38,14 +39,14 @@ test = ["sentry-core/test"]
 debug-logs = ["log_", "sentry-core/debug-logs"]
 # transports
 transport = ["reqwest", "native-tls"]
-reqwest = ["reqwest_", "httpdate", "tokio"]
-curl = ["curl_", "httpdate"]
-surf-h1 = ["surf_/h1-client", "httpdate"]
-surf = ["surf_/curl-client", "httpdate", "tokio"]
-native-tls = ["reqwest_/default-tls"]
-rustls = ["reqwest_/rustls-tls"]
-ureq = ["ureq_/tls", "httpdate"]
-ureq-native-tls = ["ureq_/native-tls", "httpdate"]
+reqwest = ["dep:reqwest", "httpdate", "tokio"]
+curl = ["dep:curl", "httpdate"]
+surf-h1 = ["surf/h1-client", "httpdate"]
+surf = ["surf/curl-client", "httpdate", "tokio"]
+ureq = ["dep:ureq", "httpdate"]
+# transport settings
+native-tls = ["reqwest?/default-tls", "ureq?/native-tls"]
+rustls = ["reqwest?/rustls-tls", "ureq?/tls"]
 
 [dependencies]
 sentry-core = { version = "0.25.0", path = "../sentry-core", features = ["client"] }
@@ -59,13 +60,13 @@ sentry-slog = { version = "0.25.0", path = "../sentry-slog", optional = true }
 sentry-tower = { version = "0.25.0", path = "../sentry-tower", optional = true }
 sentry-tracing = { version = "0.25.0", path = "../sentry-tracing", optional = true }
 log_ = { package = "log", version = "0.4.8", optional = true, features = ["std"] }
-reqwest_ = { package = "reqwest", version = "0.11", optional = true, features = ["blocking", "json"], default-features = false }
-curl_ = { package = "curl", version = "0.4.25", optional = true }
+reqwest = { version = "0.11", optional = true, features = ["blocking", "json"], default-features = false }
+curl = { version = "0.4.25", optional = true }
 httpdate = { version = "1.0.0", optional = true }
-surf_ = { package = "surf", version = "2.0.0", optional = true, default-features = false }
+surf = { version = "2.0.0", optional = true, default-features = false }
 serde_json = { version = "1.0.48", optional = true }
 tokio = { version = "1.0", features = ["rt"], optional = true }
-ureq_ = { package = "ureq", version = "2.3.0", optional = true, default-features = false }
+ureq = { version = "2.3.0", optional = true, default-features = false }
 
 [dev-dependencies]
 sentry-anyhow = { path = "../sentry-anyhow" }
@@ -79,6 +80,6 @@ log_ = { package = "log", version = "0.4.8", features = ["std"] }
 pretty_env_logger = "0.4.0"
 slog_ = { package = "slog", version = "2.5.2" }
 tokio = { version = "1.0", features = ["macros"] }
-tower_ = { package = "tower", version = "0.4", features = ["util"] }
+tower = { version = "0.4", features = ["util"] }
 tracing_ = { package = "tracing", version = "0.1" }
 tracing-subscriber = { version = "0.3", features = ["fmt", "tracing-log"] }

sentry/src/transports/curl.rs

@@ -1,7 +1,7 @@
 use std::io::{Cursor, Read};
 use std::time::Duration;
 
-use curl_::{self as curl, easy::Easy as CurlClient};
+use curl::{self as curl, easy::Easy as CurlClient};
 
 use super::thread::TransportThread;
 

sentry/src/transports/mod.rs

@@ -16,22 +16,22 @@ mod tokio_thread;
 #[cfg(feature = "reqwest")]
 mod reqwest;
 #[cfg(feature = "reqwest")]
-pub use reqwest::ReqwestHttpTransport;
+pub use self::reqwest::ReqwestHttpTransport;
 
 #[cfg(feature = "curl")]
 mod curl;
 #[cfg(feature = "curl")]
-pub use curl::CurlHttpTransport;
+pub use self::curl::CurlHttpTransport;
 
 #[cfg(feature = "surf")]
 mod surf;
 #[cfg(feature = "surf")]
-pub use surf::SurfHttpTransport;
+pub use self::surf::SurfHttpTransport;
 
 #[cfg(feature = "ureq")]
 mod ureq;
 #[cfg(feature = "ureq")]
-pub use ureq::UreqHttpTransport;
+pub use self::ureq::UreqHttpTransport;
 
 #[cfg(feature = "reqwest")]
 type DefaultTransport = ReqwestHttpTransport;

sentry/src/transports/reqwest.rs

@@ -1,6 +1,6 @@
 use std::time::Duration;
 
-use reqwest_::{header as ReqwestHeaders, Client as ReqwestClient, Proxy, StatusCode};
+use reqwest::{header as ReqwestHeaders, Client as ReqwestClient, Proxy, StatusCode};
 
 use super::tokio_thread::TransportThread;
 
@@ -31,7 +31,7 @@ impl ReqwestHttpTransport {
 
     fn new_internal(options: &ClientOptions, client: Option<ReqwestClient>) -> Self {
         let client = client.unwrap_or_else(|| {
-            let mut builder = reqwest_::Client::builder();
+            let mut builder = reqwest::Client::builder();
             if let Some(url) = options.http_proxy.as_ref() {
                 builder = builder.proxy(Proxy::http(url.as_ref()).unwrap());
             };

sentry/src/transports/surf.rs

@@ -1,6 +1,6 @@
 use std::time::Duration;
 
-use surf_::{http::headers as SurfHeaders, Client as SurfClient, StatusCode};
+use surf::{http::headers as SurfHeaders, Client as SurfClient, StatusCode};
 
 use super::tokio_thread::TransportThread;
 

sentry/src/transports/ureq.rs

@@ -1,8 +1,6 @@
 use std::time::Duration;
 
-#[cfg(fdoc)]
-use ureq_ as ureq;
-use ureq_::{Agent, AgentBuilder, Proxy};
+use ureq::{Agent, AgentBuilder, Proxy};
 
 use super::thread::TransportThread;
 
@@ -11,8 +9,6 @@ use crate::{sentry_debug, types::Scheme, ClientOptions, Envelope, Transport};
 /// A [`Transport`] that sends events via the [`ureq`] library.
 ///
 /// This is enabled by the `ureq` feature flag.
-///
-/// [`ureq`]: https://crates.io/crates/ureq
 #[cfg_attr(doc_cfg, doc(cfg(feature = "ureq")))]
 pub struct UreqHttpTransport {
     thread: TransportThread,

sentry/tests/test_tower.rs

@@ -8,7 +8,7 @@ use sentry::{
     ClientOptions, Hub,
 };
 use sentry_tower::SentryLayer;
-use tower_::{ServiceBuilder, ServiceExt};
+use tower::{ServiceBuilder, ServiceExt};
 
 #[test]
 fn test_tower_hub() {