Issue:
Bug: Add span metadata to `tokio` spawned futures



Add span metadata to `tokio` spawned futures, as logs do not have parent span context.

Pull request description:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [ ] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->
Add span metadata to `tokio` spawned futures, as logs do not have parent span context. Also removed unused marco.

### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding changes.

Following are the paths where you can find config files:
1. `config`
2. `crates/router/src/configs`
3. `loadtest/config`
-->


## Motivation and Context
<!--
Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

If you don't have an issue, we'd recommend starting with one first so the PR
can focus on the implementation (unless it is an obvious bug or documentation fix
that will have little conversation).
-->


## How did you test it?
<!--
Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
-->
Logs of save payment method. Initially the `request_id` was not available for this logs.
![image](https://github.com/juspay/hyperswitch/assets/83439957/ce6f2d8a-de71-44cf-b4a2-67691288f5ab)

## Checklist
<!-- Put an `x` in the boxes that apply -->

- [x] I formatted the code `cargo +nightly fmt --all`
- [x] I addressed lints thrown by `cargo clippy`
- [x] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable


Testing:

Logs of save payment method. Initially the `request_id` was not available for this logs.
![image](https://github.com/juspay/hyperswitch/assets/83439957/ce6f2d8a-de71-44cf-b4a2-67691288f5ab)

Patch:
diff --git a/crates/common_utils/src/macros.rs b/crates/common_utils/src/macros.rs
index c07b2112db2..b8d5743d8fe 100644
--- a/crates/common_utils/src/macros.rs
+++ b/crates/common_utils/src/macros.rs
@@ -47,13 +47,6 @@ macro_rules! newtype {
     };
 }
 
-#[macro_export]
-macro_rules! async_spawn {
-    ($t:block) => {
-        tokio::spawn(async move { $t });
-    };
-}
-
 /// Use this to ensure that the corresponding
 /// openapi route has been implemented in the openapi crate
 #[macro_export]
diff --git a/crates/diesel_models/src/lib.rs b/crates/diesel_models/src/lib.rs
index 44e4d174537..27bf11a7e6f 100644
--- a/crates/diesel_models/src/lib.rs
+++ b/crates/diesel_models/src/lib.rs
@@ -24,7 +24,6 @@ pub mod gsm;
 #[cfg(feature = "kv_store")]
 pub mod kv;
 pub mod locker_mock_up;
-pub mod macros;
 pub mod mandate;
 pub mod merchant_account;
 pub mod merchant_connector_account;
diff --git a/crates/diesel_models/src/macros.rs b/crates/diesel_models/src/macros.rs
deleted file mode 100644
index de3596ecc10..00000000000
--- a/crates/diesel_models/src/macros.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-#[macro_export]
-macro_rules! async_spawn {
-    ($t:block) => {
-        tokio::spawn(async move { $t });
-    };
-}
diff --git a/crates/drainer/src/handler.rs b/crates/drainer/src/handler.rs
index 5aa902d84c5..47b60db80d5 100644
--- a/crates/drainer/src/handler.rs
+++ b/crates/drainer/src/handler.rs
@@ -1,5 +1,6 @@
 use std::sync::{atomic, Arc};
 
+use router_env::tracing::Instrument;
 use tokio::{
     sync::{mpsc, oneshot},
     time::{self, Duration},
@@ -68,13 +69,16 @@ impl Handler {
         while self.running.load(atomic::Ordering::SeqCst) {
             metrics::DRAINER_HEALTH.add(&metrics::CONTEXT, 1, &[]);
             if self.store.is_stream_available(stream_index).await {
-                tokio::spawn(drainer_handler(
-                    self.store.clone(),
-                    stream_index,
-                    self.conf.max_read_count,
-                    self.active_tasks.clone(),
-                    jobs_picked.clone(),
-                ));
+                let _task_handle = tokio::spawn(
+                    drainer_handler(
+                        self.store.clone(),
+                        stream_index,
+                        self.conf.max_read_count,
+                        self.active_tasks.clone(),
+                        jobs_picked.clone(),
+                    )
+                    .in_current_span(),
+                );
             }
             stream_index = utils::increment_stream_index(
                 (stream_index, jobs_picked.clone()),
@@ -116,10 +120,12 @@ impl Handler {
         let redis_conn_clone = self.store.redis_conn.clone();
 
         // Spawn a task to monitor if redis is down or not
-        tokio::spawn(async move { redis_conn_clone.on_error(redis_error_tx).await });
+        let _task_handle = tokio::spawn(
+            async move { redis_conn_clone.on_error(redis_error_tx).await }.in_current_span(),
+        );
 
         //Spawns a task to send shutdown signal if redis goes down
-        tokio::spawn(redis_error_receiver(redis_error_rx, tx));
+        let _task_handle = tokio::spawn(redis_error_receiver(redis_error_rx, tx).in_current_span());
 
         Ok(())
     }
diff --git a/crates/drainer/src/lib.rs b/crates/drainer/src/lib.rs
index 0ed6183faef..e7ae7621365 100644
--- a/crates/drainer/src/lib.rs
+++ b/crates/drainer/src/lib.rs
@@ -18,7 +18,10 @@ use common_utils::signals::get_allowed_signals;
 use diesel_models::kv;
 use error_stack::{IntoReport, ResultExt};
 use hyperswitch_interfaces::secrets_interface::secret_state::RawSecret;
-use router_env::{instrument, tracing};
+use router_env::{
+    instrument,
+    tracing::{self, Instrument},
+};
 use tokio::sync::mpsc;
 
 pub(crate) type Settings = crate::settings::Settings<RawSecret>;
@@ -39,7 +42,8 @@ pub async fn start_drainer(store: Arc<Store>, conf: DrainerSettings) -> errors::
                 "Failed while getting allowed signals".to_string(),
             ))?;
     let handle = signal.handle();
-    let task_handle = tokio::spawn(common_utils::signals::signal_handler(signal, tx.clone()));
+    let task_handle =
+        tokio::spawn(common_utils::signals::signal_handler(signal, tx.clone()).in_current_span());
 
     let handler_clone = drainer_handler.clone();
 
diff --git a/crates/router/src/bin/scheduler.rs b/crates/router/src/bin/scheduler.rs
index c586bfecdb7..1df37e9f6d1 100644
--- a/crates/router/src/bin/scheduler.rs
+++ b/crates/router/src/bin/scheduler.rs
@@ -16,7 +16,10 @@ use router::{
     services::{self, api},
     workflows,
 };
-use router_env::{instrument, tracing};
+use router_env::{
+    instrument,
+    tracing::{self, Instrument},
+};
 use scheduler::{
     consumer::workflows::ProcessTrackerWorkflow, errors::ProcessTrackerError,
     workflows::ProcessTrackerWorkflows, SchedulerAppState,
@@ -49,10 +52,9 @@ async fn main() -> CustomResult<(), ProcessTrackerError> {
     .await;
     // channel to shutdown scheduler gracefully
     let (tx, rx) = mpsc::channel(1);
-    tokio::spawn(router::receiver_for_error(
-        redis_shutdown_signal_rx,
-        tx.clone(),
-    ));
+    let _task_handle = tokio::spawn(
+        router::receiver_for_error(redis_shutdown_signal_rx, tx.clone()).in_current_span(),
+    );
 
     #[allow(clippy::expect_used)]
     let scheduler_flow_str =
@@ -81,10 +83,13 @@ async fn main() -> CustomResult<(), ProcessTrackerError> {
     .await
     .expect("Failed to create the server");
 
-    tokio::spawn(async move {
-        let _ = web_server.await;
-        logger::error!("The health check probe stopped working!");
-    });
+    let _task_handle = tokio::spawn(
+        async move {
+            let _ = web_server.await;
+            logger::error!("The health check probe stopped working!");
+        }
+        .in_current_span(),
+    );
 
     logger::debug!(startup_config=?state.conf);
 
diff --git a/crates/router/src/core/payments/flows/authorize_flow.rs b/crates/router/src/core/payments/flows/authorize_flow.rs
index efc0e8852da..7757313d867 100644
--- a/crates/router/src/core/payments/flows/authorize_flow.rs
+++ b/crates/router/src/core/payments/flows/authorize_flow.rs
@@ -1,5 +1,6 @@
 use async_trait::async_trait;
 use error_stack;
+use router_env::tracing::Instrument;
 
 use super::{ConstructFlowSpecificData, Feature};
 use crate::{
@@ -125,26 +126,32 @@ impl Feature<api::Authorize, types::PaymentsAuthorizeData> for types::PaymentsAu
                 let state = state.clone();
 
                 logger::info!("Call to save_payment_method in locker");
-                tokio::spawn(async move {
-                    logger::info!("Starting async call to save_payment_method in locker");
-
-                    let result = Box::pin(tokenization::save_payment_method(
-                        &state,
-                        &connector,
-                        response,
-                        &maybe_customer,
-                        &merchant_account,
-                        self.request.payment_method_type,
-                        &key_store,
-                        Some(resp.request.amount),
-                        Some(resp.request.currency),
-                    ))
-                    .await;
-
-                    if let Err(err) = result {
-                        logger::error!("Asynchronously saving card in locker failed : {:?}", err);
+                let _task_handle = tokio::spawn(
+                    async move {
+                        logger::info!("Starting async call to save_payment_method in locker");
+
+                        let result = Box::pin(tokenization::save_payment_method(
+                            &state,
+                            &connector,
+                            response,
+                            &maybe_customer,
+                            &merchant_account,
+                            self.request.payment_method_type,
+                            &key_store,
+                            Some(resp.request.amount),
+                            Some(resp.request.currency),
+                        ))
+                        .await;
+
+                        if let Err(err) = result {
+                            logger::error!(
+                                "Asynchronously saving card in locker failed : {:?}",
+                                err
+                            );
+                        }
                     }
-                });
+                    .in_current_span(),
+                );
 
                 Ok(resp)
             }
diff --git a/crates/router/src/core/payments/operations/payment_confirm.rs b/crates/router/src/core/payments/operations/payment_confirm.rs
index 97b1d8e9817..b0bdc921107 100644
--- a/crates/router/src/core/payments/operations/payment_confirm.rs
+++ b/crates/router/src/core/payments/operations/payment_confirm.rs
@@ -160,18 +160,21 @@ impl<F: Send + Clone, Ctx: PaymentMethodRetrieve>
 
         let store = state.store.clone();
 
-        let business_profile_fut = tokio::spawn(async move {
-            store
-                .find_business_profile_by_profile_id(&profile_id)
-                .map(|business_profile_result| {
-                    business_profile_result.to_not_found_response(
-                        errors::ApiErrorResponse::BusinessProfileNotFound {
-                            id: profile_id.to_string(),
-                        },
-                    )
-                })
-                .await
-        });
+        let business_profile_fut = tokio::spawn(
+            async move {
+                store
+                    .find_business_profile_by_profile_id(&profile_id)
+                    .map(|business_profile_result| {
+                        business_profile_result.to_not_found_response(
+                            errors::ApiErrorResponse::BusinessProfileNotFound {
+                                id: profile_id.to_string(),
+                            },
+                        )
+                    })
+                    .await
+            }
+            .in_current_span(),
+        );
 
         let store = state.store.clone();
 
@@ -498,13 +501,17 @@ impl<F: Send + Clone, Ctx: PaymentMethodRetrieve>
 
         let store = state.clone().store;
 
-        let additional_pm_data_fut = tokio::spawn(async move {
-            Ok(n_request_payment_method_data
-                .async_map(|payment_method_data| async move {
-                    helpers::get_additional_payment_data(&payment_method_data, store.as_ref()).await
-                })
-                .await)
-        });
+        let additional_pm_data_fut = tokio::spawn(
+            async move {
+                Ok(n_request_payment_method_data
+                    .async_map(|payment_method_data| async move {
+                        helpers::get_additional_payment_data(&payment_method_data, store.as_ref())
+                            .await
+                    })
+                    .await)
+            }
+            .in_current_span(),
+        );
 
         let store = state.clone().store;
 
diff --git a/crates/router/src/lib.rs b/crates/router/src/lib.rs
index 97d981c68eb..efba097d92d 100644
--- a/crates/router/src/lib.rs
+++ b/crates/router/src/lib.rs
@@ -31,6 +31,7 @@ use actix_web::{
 };
 use http::StatusCode;
 use hyperswitch_interfaces::secrets_interface::secret_state::SecuredSecret;
+use router_env::tracing::Instrument;
 use routes::AppState;
 use storage_impl::errors::ApplicationResult;
 use tokio::sync::{mpsc, oneshot};
@@ -195,7 +196,7 @@ pub async fn start_server(conf: settings::Settings<SecuredSecret>) -> Applicatio
         .workers(server.workers)
         .shutdown_timeout(server.shutdown_timeout)
         .run();
-    tokio::spawn(receiver_for_error(rx, server.handle()));
+    let _task_handle = tokio::spawn(receiver_for_error(rx, server.handle()).in_current_span());
     Ok(server)
 }
 
diff --git a/crates/router/tests/utils.rs b/crates/router/tests/utils.rs
index e1ab3e80f32..5d48d6e8ad0 100644
--- a/crates/router/tests/utils.rs
+++ b/crates/router/tests/utils.rs
@@ -12,6 +12,7 @@ use actix_web::{
 };
 use derive_deref::Deref;
 use router::{configs::settings::Settings, routes::AppState, services};
+use router_env::tracing::Instrument;
 use serde::{de::DeserializeOwned, Deserialize};
 use serde_json::{json, Value};
 use tokio::sync::{oneshot, OnceCell};
@@ -24,7 +25,7 @@ async fn spawn_server() -> bool {
         .await
         .expect("failed to create server");
 
-    let _server = tokio::spawn(server);
+    let _server = tokio::spawn(server.in_current_span());
     true
 }
 
diff --git a/crates/scheduler/src/consumer.rs b/crates/scheduler/src/consumer.rs
index e069db28da7..471f689ffc8 100644
--- a/crates/scheduler/src/consumer.rs
+++ b/crates/scheduler/src/consumer.rs
@@ -10,7 +10,10 @@ pub use diesel_models::{self, process_tracker as storage};
 use error_stack::{IntoReport, ResultExt};
 use futures::future;
 use redis_interface::{RedisConnectionPool, RedisEntryId};
-use router_env::{instrument, tracing};
+use router_env::{
+    instrument,
+    tracing::{self, Instrument},
+};
 use time::PrimitiveDateTime;
 use tokio::sync::mpsc;
 use uuid::Uuid;
@@ -64,7 +67,8 @@ pub async fn start_consumer<T: SchedulerAppState + 'static>(
         .into_report()
         .attach_printable("Failed while creating a signals handler")?;
     let handle = signal.handle();
-    let task_handle = tokio::spawn(common_utils::signals::signal_handler(signal, tx));
+    let task_handle =
+        tokio::spawn(common_utils::signals::signal_handler(signal, tx).in_current_span());
 
     'consumer: loop {
         match rx.try_recv() {
diff --git a/crates/scheduler/src/producer.rs b/crates/scheduler/src/producer.rs
index bcf37cdf6f2..b8081c2b9ae 100644
--- a/crates/scheduler/src/producer.rs
+++ b/crates/scheduler/src/producer.rs
@@ -3,7 +3,10 @@ use std::sync::Arc;
 use common_utils::errors::CustomResult;
 use diesel_models::enums::ProcessTrackerStatus;
 use error_stack::{report, IntoReport, ResultExt};
-use router_env::{instrument, tracing};
+use router_env::{
+    instrument,
+    tracing::{self, Instrument},
+};
 use time::Duration;
 use tokio::sync::mpsc;
 
@@ -57,7 +60,8 @@ where
         .into_report()
         .attach_printable("Failed while creating a signals handler")?;
     let handle = signal.handle();
-    let task_handle = tokio::spawn(common_utils::signals::signal_handler(signal, tx));
+    let task_handle =
+        tokio::spawn(common_utils::signals::signal_handler(signal, tx).in_current_span());
 
     loop {
         match rx.try_recv() {
diff --git a/crates/storage_impl/src/redis.rs b/crates/storage_impl/src/redis.rs
index e4e0c021ac8..be82d4cc293 100644
--- a/crates/storage_impl/src/redis.rs
+++ b/crates/storage_impl/src/redis.rs
@@ -6,7 +6,7 @@ use std::sync::{atomic, Arc};
 
 use error_stack::{IntoReport, ResultExt};
 use redis_interface::PubsubInterface;
-use router_env::logger;
+use router_env::{logger, tracing::Instrument};
 
 use self::{kv_store::RedisConnInterface, pub_sub::PubSubInterface};
 
@@ -35,9 +35,12 @@ impl RedisStore {
 
     pub fn set_error_callback(&self, callback: tokio::sync::oneshot::Sender<()>) {
         let redis_clone = self.redis_conn.clone();
-        tokio::spawn(async move {
-            redis_clone.on_error(callback).await;
-        });
+        let _task_handle = tokio::spawn(
+            async move {
+                redis_clone.on_error(callback).await;
+            }
+            .in_current_span(),
+        );
     }
 
     pub async fn subscribe_to_channel(
@@ -54,11 +57,14 @@ impl RedisStore {
             .change_context(redis_interface::errors::RedisError::SubscribeError)?;
 
         let redis_clone = self.redis_conn.clone();
-        tokio::spawn(async move {
-            if let Err(e) = redis_clone.on_message().await {
-                logger::error!(pubsub_err=?e);
+        let _task_handle = tokio::spawn(
+            async move {
+                if let Err(e) = redis_clone.on_message().await {
+                    logger::error!(pubsub_err=?e);
+                }
             }
-        });
+            .in_current_span(),
+        );
         Ok(())
     }
 }