Instrumented macro refactoring

Author: Mariusz Reichert

Cargo.lock

@@ -1,4 +1,5 @@
-workspace = { members = ["instrumented_macro"] }
+workspace = { members = ["electrs_macros"] }
+
 [package]
 name = "electrs"
 version = "0.4.1"
@@ -17,17 +18,14 @@ default-run = "electrs"
 liquid = ["elements"]
 electrum-discovery = ["electrum-client"]
 bench = []
-default = ["no-otlp-tracing"]
 otlp-tracing = [
-    "tracing/max_level_trace",
+    "tracing",
     "tracing-subscriber",
     "opentelemetry",
     "tracing-opentelemetry",
     "opentelemetry-otlp",
-    "opentelemetry-semantic-conventions"
-]
-no-otlp-tracing = [
-    "tracing/max_level_off"
+    "opentelemetry-semantic-conventions",
+    "electrs_macros/otlp-tracing"
 ]
 
 [dependencies]
@@ -71,12 +69,12 @@ tracing-opentelemetry = {  version = "0.21.0", optional = true }
 opentelemetry-otlp = { version = "0.13.0", default-features = false, features = ["http-proto", "reqwest-client"], optional = true }
 tracing-subscriber = { version = "0.3.17", default-features = false, features = ["env-filter", "fmt"], optional = true }
 opentelemetry-semantic-conventions = { version = "0.12.0", optional = true }
-tracing = { version = "0.1.40", default-features = false, features = ["attributes"] }
+tracing = { version = "0.1.40", default-features = false, features = ["attributes"], optional = true }
 
 # optional dependencies for electrum-discovery
 electrum-client = { version = "0.8", optional = true }
 zmq = "0.10.0"
-instrumented_macro = { path = "instrumented_macro" }
+electrs_macros = { path = "electrs_macros", default-features = false }
 
 [dev-dependencies]
 bitcoind = { version = "0.36", features = ["25_0"] }

Cargo.toml

@@ -1,11 +1,14 @@
 [package]
-name = "instrumented_macro"
+name = "electrs_macros"
 version = "0.1.0"
 edition = "2021"
 
 [lib]
 proc-macro = true
 
+[features]
+otlp-tracing = []
+
 [dependencies]
 syn = "2.0"
 quote = "1.0"

instrumented_macro/Cargo.toml electrs_macros/Cargo.tomlinstrumented_macro/Cargo.toml renamed to electrs_macros/Cargo.toml

@@ -1,9 +1,12 @@
 use proc_macro::TokenStream;
-use quote::quote;
-use syn::{parse_macro_input, ItemFn};
+
 
 #[proc_macro_attribute]
-pub fn instrumented(attr: TokenStream, item: TokenStream) -> TokenStream {
+#[cfg(feature = "otlp-tracing")]
+pub fn trace(attr: TokenStream, item: TokenStream) -> TokenStream {
+    use quote::quote;
+    use syn::{parse_macro_input, ItemFn};
+
     let additional_fields = if !attr.is_empty() {
         let attr_tokens: proc_macro2::TokenStream = attr.into();
         quote! {, #attr_tokens }
@@ -23,4 +26,10 @@ pub fn instrumented(attr: TokenStream, item: TokenStream) -> TokenStream {
     };
 
     expanded.into()
+}
+
+#[proc_macro_attribute]
+#[cfg(not(feature = "otlp-tracing"))]
+pub fn trace(_attr: TokenStream, item: TokenStream) -> TokenStream {
+    item
 }

instrumented_macro/src/lib.rs electrs_macros/src/lib.rsinstrumented_macro/src/lib.rs renamed to electrs_macros/src/lib.rs

@@ -159,7 +159,7 @@ fn main_() {
     }
 }
 
-#[cfg(feature = "no-otlp-tracing")]
+#[cfg(not(feature = "otlp-tracing"))]
 fn main() {
     main_();
 }