Runtime interface to add support for tracing from wasm (#6381)

* Add span recording to tracing implementation

* Add tracing proxy

* switch to rustc_hash::FxHashMap

* Replace lazy_static and hashmap with thread_local and vec.

* fix marking valid span as invalid while removing invalid spans

* refactor, add wasm_tracing module in `support`

* update registered spans

* tidy up

* typos

* refactor

* update flag name to signal lost trace - `is_valid_trace`

* update flag name to signal lost trace - `is_valid_trace`

* update docs

* update docs

* Use tracing Field recording to store the actual `name` and `target`
from wasm traces.

* fix debug log in subscriber + small refactor

* add tests

* handle misuse in case trying to exit span not held

* Implement filter for wasm traces, simplify field recording for primitive types

* remove superfluous warning

* update docs

* Update primitives/tracing/src/proxy.rs

Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* update docs, apply suggestions

* move Proxy from thread_local to `Extension`, rename macro

* fix test

* unify native & wasm span macro calls

* implement wasm tracing control facility in primitives and frame

* add cli flag `--wasm-tracing`

* fix

* switch to `Option<u4>` (possible performance degradation), switch
to static mut bool

* performance improvement using u64 vs Option<u64>

* performance improvement moving concat to client

* update docs

* Update client/cli/src/params/import_params.rs

Co-authored-by: Cecile Tonglet <cecile@parity.io>

* performance improvement

* Revert "performance improvement"

This reverts commit 55ff8817a86302cd93bb6197eb4ca5bc7f4fb524.

* small refactor

* formatting

* bump impl_version

* Update client/cli/src/config.rs

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* update docs

* small fixes, remove pub static

* nit

* add integration tests and refactor Subscriber

* tests

* revert formatting

* try fix test that works locally but not in CI

* try fix test that works locally but not in CI

* debug test that works locally but not in CI

* fix test that works locally but not in CI

* remove pub visibility from bool in runtime

* make TracingSpanGuard #[cfg(not(feature = "std"))], update docs, comments

* make TracingProxy drop implementation conditional on !empty state

* add docs for TraceHandler

* remove blank line

* update expect message

* update tests

* rename cli option to tracing_enable_wasm

* rename cli option to tracing_enable_wasm

* fix

* ensure wasm-tracing features are wasm only

* bump impl_version

* bump impl_version

* add `"pallet-scheduler/std"` to `[features]` `std` in node/runtime

* refactor service to remove sp_tracing dependency

* refactor: line width, trait bounds

* improve LogTraceHandler output

* fix test

* improve tracing log output

* Apply suggestions from code review

* Apply suggestions from code review

Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>

* swap wasm indication from trace name to a separate value

* Update client/tracing/src/lib.rs

* add docs

* remove runtime features

remove wasm_tracing option from CLI

remove wasm_tracing flag from ProfilingSubscriber

Co-authored-by: Matt Rutherford <mattrutherford@users.noreply.github.com>
Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com>
Co-authored-by: Bastian Köcher <bkchr@users.noreply.github.com>
Co-authored-by: Cecile Tonglet <cecile@parity.io>

substrate/client/executor/runtime-test/src/lib.rs

@@ -10,7 +10,7 @@ use sp_std::{vec::Vec, vec};
 #[cfg(not(feature = "std"))]
 use sp_io::{
 	storage, hashing::{blake2_128, blake2_256, sha2_256, twox_128, twox_256},
-	crypto::{ed25519_verify, sr25519_verify},
+	crypto::{ed25519_verify, sr25519_verify}, wasm_tracing,
 };
 #[cfg(not(feature = "std"))]
 use sp_runtime::{print, traits::{BlakeTwo256, Hash}};
@@ -246,6 +246,14 @@ sp_core::wasm_export_functions! {
 		sp_allocator::FreeingBumpHeapAllocator::new(0);
 	}
 
+	fn test_enter_span() -> u64 {
+		wasm_tracing::enter_span("integration_test_span_target", "integration_test_span_name")
+	}
+
+	fn test_exit_span(span_id: u64) {
+		wasm_tracing::exit_span(span_id)
+	}
+
 	fn returns_mutable_static() -> u64 {
 		unsafe {
 			MUTABLE_STATIC += 1;