feat(events): add events for incoming API requests (#2621)

Co-authored-by: Nishant Joshi <nishant.joshi@juspay.in>

crates/router/src/events.rs

@@ -1,9 +1,10 @@
 use serde::Serialize;
 
+pub mod api_logs;
 pub mod event_logger;
 
 pub trait EventHandler: Sync + Send + dyn_clone::DynClone {
-    fn log_event<T: Event>(&self, event: T, previous: Option<T>);
+    fn log_event<T: Event>(&self, event: T);
 }
 
 #[derive(Debug, Serialize)]

crates/router/src/events/api_logs.rs

@@ -0,0 +1,41 @@
+use router_env::{tracing_actix_web::RequestId, types::FlowMetric};
+use serde::{Deserialize, Serialize};
+use time::OffsetDateTime;
+
+use super::Event;
+
+#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize)]
+pub struct ApiEvent {
+    api_flow: String,
+    created_at_timestamp: i128,
+    request_id: String,
+    latency: u128,
+    status_code: i64,
+}
+
+impl ApiEvent {
+    pub fn new(
+        api_flow: &impl FlowMetric,
+        request_id: &RequestId,
+        latency: u128,
+        status_code: i64,
+    ) -> Self {
+        Self {
+            api_flow: api_flow.to_string(),
+            created_at_timestamp: OffsetDateTime::now_utc().unix_timestamp_nanos(),
+            request_id: request_id.as_hyphenated().to_string(),
+            latency,
+            status_code,
+        }
+    }
+}
+
+impl Event for ApiEvent {
+    fn event_type() -> super::EventType {
+        super::EventType::ApiLogs
+    }
+
+    fn key(&self) -> String {
+        self.request_id.to_string()
+    }
+}

crates/router/src/events/event_logger.rs

@@ -5,11 +5,7 @@ use crate::services::logger;
 pub struct EventLogger {}
 
 impl EventHandler for EventLogger {
-    fn log_event<T: Event>(&self, event: T, previous: Option<T>) {
-        if let Some(prev) = previous {
-            logger::info!(previous = ?serde_json::to_string(&prev).unwrap_or(r#"{ "error": "Serialization failed" }"#.to_string()), current = ?serde_json::to_string(&event).unwrap_or(r#"{ "error": "Serialization failed" }"#.to_string()), event_type =? T::event_type(), event_id =? event.key(), log_type = "event");
-        } else {
+    fn log_event<T: Event>(&self, event: T) {
         logger::info!(current = ?serde_json::to_string(&event).unwrap_or(r#"{ "error": "Serialization failed" }"#.to_string()), event_type =? T::event_type(), event_id =? event.key(), log_type = "event");
     }
-    }
 }

crates/router/src/routes/app.rs

@@ -5,6 +5,7 @@ use actix_web::{web, Scope};
 use external_services::email::{AwsSes, EmailClient};
 #[cfg(feature = "kms")]
 use external_services::kms::{self, decrypt::KmsDecrypt};
+use router_env::tracing_actix_web::RequestId;
 use scheduler::SchedulerInterface;
 use storage_impl::MockDb;
 use tokio::sync::oneshot;
@@ -58,7 +59,7 @@ pub trait AppStateInfo {
     fn event_handler(&self) -> &Self::Event;
     #[cfg(feature = "email")]
     fn email_client(&self) -> Arc<dyn EmailClient>;
-    fn add_request_id(&mut self, request_id: Option<String>);
+    fn add_request_id(&mut self, request_id: RequestId);
     fn add_merchant_id(&mut self, merchant_id: Option<String>);
     fn add_flow_name(&mut self, flow_name: String);
     fn get_request_id(&self) -> Option<String>;
@@ -79,7 +80,7 @@ impl AppStateInfo for AppState {
     fn event_handler(&self) -> &Self::Event {
         &self.event_handler
     }
-    fn add_request_id(&mut self, request_id: Option<String>) {
+    fn add_request_id(&mut self, request_id: RequestId) {
         self.api_client.add_request_id(request_id);
     }
     fn add_merchant_id(&mut self, merchant_id: Option<String>) {

crates/router/src/services/api.rs

@@ -13,7 +13,10 @@ use actix_web::{body, web, FromRequest, HttpRequest, HttpResponse, Responder, Re
 use api_models::enums::CaptureMethod;
 pub use client::{proxy_bypass_urls, ApiClient, MockApiClient, ProxyClient};
 pub use common_utils::request::{ContentType, Method, Request, RequestBuilder};
-use common_utils::{consts::X_HS_LATENCY, errors::ReportSwitchExt};
+use common_utils::{
+    consts::X_HS_LATENCY,
+    errors::{ErrorSwitch, ReportSwitchExt},
+};
 use error_stack::{report, IntoReport, Report, ResultExt};
 use masking::{ExposeOptionInterface, PeekInterface};
 use router_env::{instrument, tracing, tracing_actix_web::RequestId, Tag};
@@ -30,6 +33,7 @@ use crate::{
         errors::{self, CustomResult},
         payments,
     },
+    events::{api_logs::ApiEvent, EventHandler},
     logger,
     routes::{
         app::AppStateInfo,
@@ -750,19 +754,20 @@ where
     T: Debug,
     A: AppStateInfo + Clone,
     U: auth::AuthInfo,
-    CustomResult<ApplicationResponse<Q>, E>: ReportSwitchExt<ApplicationResponse<Q>, OErr>,
-    CustomResult<U, errors::ApiErrorResponse>: ReportSwitchExt<U, OErr>,
-    CustomResult<(), errors::ApiErrorResponse>: ReportSwitchExt<(), OErr>,
-    OErr: ResponseError + Sync + Send + 'static,
+    E: ErrorSwitch<OErr> + error_stack::Context,
+    OErr: ResponseError + error_stack::Context,
+    errors::ApiErrorResponse: ErrorSwitch<OErr>,
 {
     let request_id = RequestId::extract(request)
         .await
-        .ok()
-        .map(|id| id.as_hyphenated().to_string());
+        .into_report()
+        .attach_printable("Unable to extract request id from request")
+        .change_context(errors::ApiErrorResponse::InternalServerError.switch())?;
 
     let mut request_state = state.get_ref().clone();
 
     request_state.add_request_id(request_id);
+    let start_instant = Instant::now();
 
     let auth_out = api_auth
         .authenticate_and_fetch(request.headers(), &request_state)
@@ -795,11 +800,20 @@ where
             .switch()?;
         res
     };
+    let request_duration = Instant::now()
+        .saturating_duration_since(start_instant)
+        .as_millis();
 
     let status_code = match output.as_ref() {
         Ok(res) => metrics::request::track_response_status_code(res),
         Err(err) => err.current_context().status_code().as_u16().into(),
     };
+    state.event_handler().log_event(ApiEvent::new(
+        flow,
+        &request_id,
+        request_duration,
+        status_code,
+    ));
 
     metrics::request::status_code_metrics(status_code, flow.to_string(), merchant_id.to_string());
 
@@ -827,8 +841,7 @@ where
     U: auth::AuthInfo,
     A: AppStateInfo + Clone,
     ApplicationResponse<Q>: Debug,
-    CustomResult<ApplicationResponse<Q>, E>:
-        ReportSwitchExt<ApplicationResponse<Q>, api_models::errors::types::ApiErrorResponse>,
+    E: ErrorSwitch<api_models::errors::types::ApiErrorResponse> + error_stack::Context,
 {
     let request_method = request.method().as_str();
     let url_path = request.path();

crates/router/src/services/api/client.rs

@@ -5,6 +5,7 @@ use http::{HeaderValue, Method};
 use masking::PeekInterface;
 use once_cell::sync::OnceCell;
 use reqwest::multipart::Form;
+use router_env::tracing_actix_web::RequestId;
 
 use super::{request::Maskable, Request};
 use crate::{
@@ -167,10 +168,10 @@ where
         forward_to_kafka: bool,
     ) -> CustomResult<reqwest::Response, ApiClientError>;
 
-    fn add_request_id(&mut self, _request_id: Option<String>);
+    fn add_request_id(&mut self, request_id: RequestId);
     fn get_request_id(&self) -> Option<String>;
     fn add_merchant_id(&mut self, _merchant_id: Option<String>);
-    fn add_flow_name(&mut self, _flow_name: String);
+    fn add_flow_name(&mut self, flow_name: String);
 }
 
 dyn_clone::clone_trait_object!(ApiClient);
@@ -350,8 +351,9 @@ impl ApiClient for ProxyClient {
         crate::services::send_request(state, request, option_timeout_secs).await
     }
 
-    fn add_request_id(&mut self, _request_id: Option<String>) {
-        self.request_id = _request_id
+    fn add_request_id(&mut self, request_id: RequestId) {
+        self.request_id
+            .replace(request_id.as_hyphenated().to_string());
     }
 
     fn get_request_id(&self) -> Option<String> {
@@ -402,7 +404,7 @@ impl ApiClient for MockApiClient {
         Err(ApiClientError::UnexpectedState.into())
     }
 
-    fn add_request_id(&mut self, _request_id: Option<String>) {
+    fn add_request_id(&mut self, _request_id: RequestId) {
         // [#2066]: Add Mock implementation for ApiClient
     }