[refactor] Returning StatusCode result to decide on flow

* We can later check on the actual status to make decisions Signed-off-by: dd di cesare <didi@posteo.net>
Kuadrant · Oct 7, 2024 · 150fda4 · 150fda4
1 parent 07211cf
commit 150fda4
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Showing 5 changed files with 52 additions and 29 deletions.
diff --git a/src/envoy/mod.rs b/src/envoy/mod.rs
@@ -38,6 +38,7 @@ pub use {
     },
     base::Metadata,
     external_auth::{CheckRequest, CheckResponse, CheckResponse_oneof_http_response},
+    http_status::StatusCode,
     ratelimit::{RateLimitDescriptor, RateLimitDescriptor_Entry},
     rls::{RateLimitRequest, RateLimitResponse, RateLimitResponse_Code},
 };

diff --git a/src/filter/http_context.rs b/src/filter/http_context.rs
@@ -105,12 +105,12 @@ impl Context for Filter {
         let some_op = self.operation_dispatcher.borrow().get_operation(token_id);
 
         if let Some(operation) = some_op {
-            GrpcService::process_grpc_response(operation, resp_size);
-            self.operation_dispatcher.borrow_mut().next();
-
-            if let Some(_op) = self.operation_dispatcher.borrow_mut().next() {
-            } else {
-                self.resume_http_request()
+            if GrpcService::process_grpc_response(operation, resp_size).is_ok() {
+                self.operation_dispatcher.borrow_mut().next();
+                if let Some(_op) = self.operation_dispatcher.borrow_mut().next() {
+                } else {
+                    self.resume_http_request()
+                }
             }
         } else {
             warn!("No Operation found with token_id: {token_id}");

diff --git a/src/service.rs b/src/service.rs
@@ -3,6 +3,7 @@ pub(crate) mod grpc_message;
 pub(crate) mod rate_limit;
 
 use crate::configuration::{Action, Extension, ExtensionType, FailureMode};
+use crate::envoy::StatusCode;
 use crate::operation_dispatcher::Operation;
 use crate::service::auth::{AuthService, AUTH_METHOD_NAME, AUTH_SERVICE_NAME};
 use crate::service::grpc_message::{GrpcMessageRequest, GrpcMessageResponse};
@@ -54,27 +55,35 @@ impl GrpcService {
         &self.extension.failure_mode
     }
 
-    pub fn process_grpc_response(operation: Rc<Operation>, resp_size: usize) {
+    pub fn process_grpc_response(
+        operation: Rc<Operation>,
+        resp_size: usize,
+    ) -> Result<(), StatusCode> {
         let failure_mode = operation.get_failure_mode();
-        if let Some(res_body_bytes) = hostcalls::get_buffer(BufferType::GrpcReceiveBuffer, 0, resp_size).unwrap() {
+        if let Some(res_body_bytes) =
+            hostcalls::get_buffer(BufferType::GrpcReceiveBuffer, 0, resp_size).unwrap()
+        {
             match GrpcMessageResponse::new(operation.get_extension_type(), &res_body_bytes) {
-                Ok(res)  =>  {
-                    match operation.get_extension_type() {
-                        ExtensionType::Auth => AuthService::process_auth_grpc_response(res, failure_mode),
-                        ExtensionType::RateLimit => {
-                            RateLimitService::process_ratelimit_grpc_response(res, failure_mode)
-                        }
+                Ok(res) => match operation.get_extension_type() {
+                    ExtensionType::Auth => {
+                        AuthService::process_auth_grpc_response(res, failure_mode)
                     }
-                }
+                    ExtensionType::RateLimit => {
+                        RateLimitService::process_ratelimit_grpc_response(res, failure_mode)
+                    }
+                },
                 Err(e) => {
-                    warn!("failed to parse grpc response body into GrpcMessageResponse message: {e}");
+                    warn!(
+                        "failed to parse grpc response body into GrpcMessageResponse message: {e}"
+                    );
                     GrpcService::handle_error_on_grpc_response(failure_mode);
+                    Err(StatusCode::InternalServerError)
                 }
-            };
-        }
-        else {
-                warn!("grpc response body is empty!");
-                GrpcService::handle_error_on_grpc_response(failure_mode);
+            }
+        } else {
+            warn!("grpc response body is empty!");
+            GrpcService::handle_error_on_grpc_response(failure_mode);
+            Err(StatusCode::InternalServerError)
         }
     }
 

diff --git a/src/service/auth.rs b/src/service/auth.rs
@@ -3,12 +3,12 @@ use crate::configuration::FailureMode;
 use crate::envoy::{
     Address, AttributeContext, AttributeContext_HttpRequest, AttributeContext_Peer,
     AttributeContext_Request, CheckRequest, CheckResponse_oneof_http_response, Metadata,
-    SocketAddress,
+    SocketAddress, StatusCode,
 };
 use crate::service::grpc_message::{GrpcMessageResponse, GrpcMessageResult};
 use crate::service::GrpcService;
 use chrono::{DateTime, FixedOffset, Timelike};
-use log::debug;
+use log::{debug, warn};
 use protobuf::well_known_types::Timestamp;
 use protobuf::Message;
 use proxy_wasm::hostcalls;
@@ -92,15 +92,17 @@ impl AuthService {
         peer
     }
 
-    pub fn process_auth_grpc_response(auth_resp: GrpcMessageResponse, failure_mode: &FailureMode) {
+    pub fn process_auth_grpc_response(
+        auth_resp: GrpcMessageResponse,
+        failure_mode: &FailureMode,
+    ) -> Result<(), StatusCode> {
         if let GrpcMessageResponse::Auth(check_response) = auth_resp {
             // store dynamic metadata in filter state
             store_metadata(check_response.get_dynamic_metadata());
 
             match check_response.http_response {
                 Some(CheckResponse_oneof_http_response::ok_response(ok_response)) => {
                     debug!("process_auth_grpc_response: received OkHttpResponse");
-
                     ok_response
                         .get_response_headers_to_add()
                         .iter()
@@ -112,28 +114,36 @@ impl AuthService {
                             )
                             .unwrap()
                         });
+                    Ok(())
                 }
                 Some(CheckResponse_oneof_http_response::denied_response(denied_response)) => {
                     debug!("process_auth_grpc_response: received DeniedHttpResponse",);
 
                     let mut response_headers = vec![];
+                    let status_code = denied_response.get_status().code;
                     denied_response.get_headers().iter().for_each(|header| {
                         response_headers.push((
                             header.get_header().get_key(),
                             header.get_header().get_value(),
                         ))
                     });
                     hostcalls::send_http_response(
-                        denied_response.get_status().code as u32,
+                        status_code as u32,
                         response_headers,
                         Some(denied_response.get_body().as_ref()),
                     )
                     .unwrap();
+                    Err(status_code)
                 }
                 None => {
                     GrpcService::handle_error_on_grpc_response(failure_mode);
+                    Err(StatusCode::InternalServerError)
                 }
             }
+        } else {
+            warn!("grpc response body is empty!");
+            GrpcService::handle_error_on_grpc_response(failure_mode);
+            Err(StatusCode::InternalServerError)
         }
     }
 }
diff --git a/src/service/rate_limit.rs b/src/service/rate_limit.rs
@@ -1,6 +1,6 @@
 use crate::configuration::FailureMode;
 use crate::envoy::{
-    RateLimitDescriptor, RateLimitRequest, RateLimitResponse, RateLimitResponse_Code,
+    RateLimitDescriptor, RateLimitRequest, RateLimitResponse, RateLimitResponse_Code, StatusCode,
 };
 use crate::service::grpc_message::{GrpcMessageResponse, GrpcMessageResult};
 use crate::service::GrpcService;
@@ -37,13 +37,14 @@ impl RateLimitService {
     pub fn process_ratelimit_grpc_response(
         rl_resp: GrpcMessageResponse,
         failure_mode: &FailureMode,
-    ) {
+    ) -> Result<(), StatusCode> {
         match rl_resp {
             GrpcMessageResponse::RateLimit(RateLimitResponse {
                 overall_code: RateLimitResponse_Code::UNKNOWN,
                 ..
             }) => {
                 GrpcService::handle_error_on_grpc_response(failure_mode);
+                Err(StatusCode::InternalServerError)
             }
             GrpcMessageResponse::RateLimit(RateLimitResponse {
                 overall_code: RateLimitResponse_Code::OVER_LIMIT,
@@ -56,6 +57,7 @@ impl RateLimitService {
                 }
                 hostcalls::send_http_response(429, response_headers, Some(b"Too Many Requests\n"))
                     .unwrap();
+                Err(StatusCode::TooManyRequests)
             }
             GrpcMessageResponse::RateLimit(RateLimitResponse {
                 overall_code: RateLimitResponse_Code::OK,
@@ -70,8 +72,9 @@ impl RateLimitService {
                     )
                     .unwrap()
                 });
+                Ok(())
             }
-            _ => {}
+            _ => Err(StatusCode::InternalServerError),
         }
     }
 }