fix: address check-cfg warnings + chores

Cargo.toml

@@ -128,9 +128,9 @@ mv = { version = "0.1.0" }
 [workspace.lints]
 rustdoc.private_doc_tests = "deny"
 
-rust.future_incompatible = {level = "deny", priority = -1 }
-rust.nonstandard_style = {level = "deny", priority = -1 }
-rust.rust_2018_idioms = {level = "deny", priority = -1 }
+rust.future_incompatible = { level = "deny", priority = -1 }
+rust.nonstandard_style = { level = "deny", priority = -1 }
+rust.rust_2018_idioms = { level = "deny", priority = -1 }
 rust.unused = { level = "deny", priority = -1 }
 
 rust.anonymous_parameters = "deny"
@@ -149,6 +149,12 @@ rust.single_use_lifetimes = "warn"
 rust.unused_lifetimes = "warn"
 # TODO: reenable
 # rust.unsafe_op_in_unsafe_fn = "deny"
+rust.unexpected_cfgs = { level = "warn", check-cfg = [
+    # FIXME: https://github.com/hyperledger/iroha/issues/3102
+    'cfg(feature, values("ffi_import"))',
+    # It is set by `cargo-llvm-cov`
+    'cfg(coverage)'
+] }
 
 # pedantic
 clippy.pedantic = { level = "warn", priority = -1 }

crates/iroha_crypto/src/lib.rs

@@ -995,7 +995,6 @@ mod ffi {
     }
 
     // NOTE: Makes sure that only one `dealloc` is exported per generated dynamic library
-    #[cfg(any(crate_type = "dylib", crate_type = "cdylib"))]
     #[cfg(all(feature = "ffi_export", not(feature = "ffi_import")))]
     mod dylib {
         #[cfg(not(feature = "std"))]

crates/iroha_data_model/src/lib.rs

@@ -468,7 +468,6 @@ mod ffi {
     }
 
     // NOTE: Makes sure that only one `dealloc` is exported per generated dynamic library
-    #[cfg(any(crate_type = "dylib", crate_type = "cdylib"))]
     #[cfg(all(feature = "ffi_export", not(feature = "ffi_import")))]
     mod dylib {
         #[cfg(not(feature = "std"))]

crates/iroha_telemetry/Cargo.toml

@@ -15,7 +15,7 @@ workspace = true
 # Should not be enabled on production builds.
 dev-telemetry = []
 # Export Prometheus metrics. See https://prometheus.io/.
-metric-instrumentation = []
+metric-instrumentation = ["iroha_telemetry_derive/metric-instrumentation"]
 
 [dependencies]
 iroha_telemetry_derive = { path = "../iroha_telemetry_derive" }

crates/iroha_telemetry_derive/Cargo.toml

@@ -18,6 +18,10 @@ is-it-maintained-issue-resolution = { repository = "https://github.com/hyperledg
 is-it-maintained-open-issues = { repository = "https://github.com/hyperledger/iroha" }
 maintenance = { status = "actively-developed" }
 
+[features]
+# FIXME: it doesn't work https://github.com/hyperledger/iroha/issues/5134
+metric-instrumentation = []
+
 [dependencies]
 syn = { workspace = true }
 quote = { workspace = true }

crates/iroha_telemetry_derive/src/lib.rs

@@ -1,6 +1,9 @@
 //! Attribute-like macro for instrumenting `isi` for `prometheus`
 //! metrics. See [`macro@metrics`] for more details.
 
+// FIXME
+#![allow(unused)]
+
 use iroha_macro_utils::Emitter;
 use manyhow::{emit, manyhow, Result};
 use proc_macro2::TokenStream;
@@ -181,12 +184,16 @@ pub fn metrics(attr: TokenStream, item: TokenStream) -> TokenStream {
         return emitter.finish_token_stream();
     };
 
-    let result = impl_metrics(&mut emitter, &metric_specs, &func);
+    let result = impl_metrics(&mut emitter, metric_specs, &func);
 
     emitter.finish_token_stream_with(result)
 }
 
-fn impl_metrics(emitter: &mut Emitter, _specs: &MetricSpecs, func: &syn::ItemFn) -> TokenStream {
+fn impl_metrics(
+    emitter: &mut Emitter,
+    #[cfg_attr(not(feature = "metric-instrumentation"), allow(unused))] specs: MetricSpecs,
+    func: &syn::ItemFn,
+) -> TokenStream {
     let syn::ItemFn {
         attrs,
         vis,
@@ -224,7 +231,8 @@ fn impl_metrics(emitter: &mut Emitter, _specs: &MetricSpecs, func: &syn::ItemFn)
 
     // Again this may seem fragile, but if we move the metrics from
     // the `WorldStateView`, we'd need to refactor many things anyway
-    let _metric_arg_ident = match arg_metrics(&sig.inputs) {
+    #[cfg_attr(not(feature = "metric-instrumentation"), allow(unused_variables))]
+    let metric_arg_ident = match arg_metrics(&sig.inputs) {
         Ok(ident) => ident,
         Err(args) => {
             emit!(
@@ -236,34 +244,34 @@ fn impl_metrics(emitter: &mut Emitter, _specs: &MetricSpecs, func: &syn::ItemFn)
         }
     };
 
-    #[cfg(feature = "metric-instrumentation")]
-    let res = {
-        let (totals, successes, times) = write_metrics(_metric_arg_ident, _specs);
-        quote!(
-            #(#attrs)* #vis #sig {
-                let _closure = || #block;
-                let started_at = std::time::Instant::now();
-
-                #totals
-                let res = _closure();
-
-                #times
-                if let Ok(_) = res {
-                    #successes
-                };
-                res
-        });
-    };
+    // #[cfg(feature = "metric-instrumentation")]
+    // {
+    //     let (totals, successes, times) = write_metrics(metric_arg_ident, specs);
+    //     quote!(
+    //         #(#attrs)* #vis #sig {
+    //             let closure = || #block;
+    //             let started_at = std::time::Instant::now();
+    //
+    //             #totals
+    //             let res = closure();
+    //
+    //             #times
+    //             if let Ok(_) = res {
+    //                 #successes
+    //             };
+    //             res
+    //     })
+    // }
 
-    #[cfg(not(feature = "metric-instrumentation"))]
-    let res = quote!(
+    // #[cfg(not(feature = "metric-instrumentation"))]
+    quote!(
         #(#attrs)* #vis #sig {
             #block
         }
-    );
-    res
+    )
 }
 
+// FIXME: metrics were removed https://github.com/hyperledger/iroha/issues/5134
 #[cfg(feature = "metric-instrumentation")]
 fn write_metrics(
     metric_arg_ident: proc_macro2::Ident,

wasm_samples/default_executor/src/lib.rs

@@ -2,7 +2,6 @@
 
 #![no_std]
 
-extern crate alloc;
 #[cfg(not(test))]
 extern crate panic_halt;
 

wasm_samples/executor_with_migration_fail/src/lib.rs

@@ -2,7 +2,6 @@
 
 #![no_std]
 
-extern crate alloc;
 #[cfg(not(test))]
 extern crate panic_halt;
 

wasm_samples/query_assets_and_save_cursor/src/lib.rs

@@ -5,8 +5,6 @@
 #[cfg(not(test))]
 extern crate panic_halt;
 
-extern crate alloc;
-
 use dlmalloc::GlobalDlmalloc;
 use iroha_smart_contract::{
     data_model::query::{