Map Cronet error code to gRPC error code. (#25880)

src/core/ext/transport/cronet/transport/cronet_status.cc

@@ -491,3 +491,37 @@ const char* cronet_net_error_as_string(cronet_net_error_code net_error) {
   }
   return "UNAVAILABLE.";
 }
+
+grpc_status_code cronet_net_error_to_grpc_error(
+    cronet_net_error_code net_error) {
+  switch (net_error) {
+    case OK:
+      return GRPC_STATUS_OK;
+    case CRONET_NET_ERROR_ABORTED:
+      return GRPC_STATUS_ABORTED;
+    case CRONET_NET_ERROR_ACCESS_DENIED:
+    case CRONET_NET_ERROR_NETWORK_ACCESS_DENIED:
+      return GRPC_STATUS_PERMISSION_DENIED;
+    case CRONET_NET_ERROR_SSL_CLIENT_AUTH_CERT_NEEDED:
+    case CRONET_NET_ERROR_PROXY_AUTH_UNSUPPORTED:
+    case CRONET_NET_ERROR_BAD_SSL_CLIENT_AUTH_CERT:
+    case CRONET_NET_ERROR_PROXY_AUTH_REQUESTED:
+    case CRONET_NET_ERROR_SSL_CLIENT_AUTH_PRIVATE_KEY_ACCESS_DENIED:
+    case CRONET_NET_ERROR_SSL_CLIENT_AUTH_CERT_NO_PRIVATE_KEY:
+    case CRONET_NET_ERROR_SSL_CLIENT_AUTH_SIGNATURE_FAILED:
+    case CRONET_NET_ERROR_CLIENT_AUTH_CERT_TYPE_UNSUPPORTED:
+    case CRONET_NET_ERROR_SSL_CLIENT_AUTH_CERT_BAD_FORMAT:
+    case CRONET_NET_ERROR_SSL_CLIENT_AUTH_NO_COMMON_ALGORITHMS:
+    case CRONET_NET_ERROR_CERT_AUTHORITY_INVALID:
+    case CRONET_NET_ERROR_UNEXPECTED_PROXY_AUTH:
+    case CRONET_NET_ERROR_MALFORMED_IDENTITY:
+    case CRONET_NET_ERROR_INVALID_AUTH_CREDENTIALS:
+    case CRONET_NET_ERROR_UNSUPPORTED_AUTH_SCHEME:
+    case CRONET_NET_ERROR_MISSING_AUTH_CREDENTIALS:
+      return GRPC_STATUS_UNAUTHENTICATED;
+    default:
+      return GRPC_STATUS_UNAVAILABLE;
+  }
+
+  return GRPC_STATUS_UNAVAILABLE;
+}

src/core/ext/transport/cronet/transport/cronet_status.h

@@ -21,6 +21,8 @@
 
 #include <grpc/impl/codegen/port_platform.h>
 
+#include <grpc/status.h>
+
 enum cronet_net_error_code {
   //
   // Ranges:
@@ -1037,5 +1039,7 @@ enum cronet_net_error_code {
 };
 
 const char* cronet_net_error_as_string(cronet_net_error_code net_error);
+grpc_status_code cronet_net_error_to_grpc_error(
+    cronet_net_error_code net_error);
 
 #endif /* GRPC_CORE_EXT_TRANSPORT_CRONET_TRANSPORT_CRONET_STATUS_H */

src/core/ext/transport/cronet/transport/cronet_transport.cc

@@ -1321,9 +1321,11 @@ static enum e_op_result execute_stream_op(struct op_and_state* oas) {
     if (stream_state->state_op_done[OP_CANCEL_ERROR]) {
       error = GRPC_ERROR_REF(stream_state->cancel_error);
     } else if (stream_state->state_callback_received[OP_FAILED]) {
+      grpc_status_code grpc_error_code =
+          cronet_net_error_to_grpc_error(stream_state->net_error);
       const char* desc = cronet_net_error_as_string(stream_state->net_error);
-      error = make_error_with_desc(GRPC_STATUS_UNAVAILABLE,
-                                   stream_state->net_error, desc);
+      error =
+          make_error_with_desc(grpc_error_code, stream_state->net_error, desc);
     } else if (oas->s->state.rs.trailing_metadata_valid) {
       grpc_chttp2_incoming_metadata_buffer_publish(
           &oas->s->state.rs.trailing_metadata,
@@ -1362,10 +1364,12 @@ static enum e_op_result execute_stream_op(struct op_and_state* oas) {
       if (stream_op->on_complete) {
         const char* error_message =
             cronet_net_error_as_string(stream_state->net_error);
+        grpc_status_code grpc_error_code =
+            cronet_net_error_to_grpc_error(stream_state->net_error);
         grpc_core::ExecCtx::Run(
             DEBUG_LOCATION, stream_op->on_complete,
-            make_error_with_desc(GRPC_STATUS_UNAVAILABLE,
-                                 stream_state->net_error, error_message));
+            make_error_with_desc(grpc_error_code, stream_state->net_error,
+                                 error_message));
       }
     } else {
       /* All actions in this stream_op are complete. Call the on_complete