[nspcc-dev#190] status: Add OBJECT_ALREADY_REMOVED code

Add `OBJECT_ALREADY_REMOVED` value to `Object` enumeration. Return this
status from object GET/HEAD/RANGE operations.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

object/service.proto

@@ -30,7 +30,9 @@ service ObjectService {
   // - **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT):
   // object not found in container;
   // - **TOKEN_EXPIRED** (4097, SECTION_SESSION):
-  // provided session token has expired.
+  // provided session token has expired;
+  // - **OBJECT_ALREADY_REMOVED** (2052, SECTION_OBJECT):
+  // the requested object has been marked as deleted.
   rpc Get(GetRequest) returns (stream GetResponse);
 
   // Put the object into container. Request uses gRPC stream. First message
@@ -93,7 +95,9 @@ service ObjectService {
   // - **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT):
   // object not found in container;
   // - **TOKEN_EXPIRED** (4097, SECTION_SESSION):
-  // provided session token has expired.
+  // provided session token has expired;
+  // - **OBJECT_ALREADY_REMOVED** (2052, SECTION_OBJECT):
+  // the requested object has been marked as deleted.
   rpc Head(HeadRequest) returns (HeadResponse);
 
   // Search objects in container. Search query allows to match by Object
@@ -128,7 +132,9 @@ service ObjectService {
   // - **OBJECT_NOT_FOUND** (2049, SECTION_OBJECT):
   // object not found in container;
   // - **TOKEN_EXPIRED** (4097, SECTION_SESSION):
-  // provided session token has expired.
+  // provided session token has expired;
+  // - **OBJECT_ALREADY_REMOVED** (2052, SECTION_OBJECT):
+  // the requested object has been marked as deleted.
   rpc GetRange(GetRangeRequest) returns (stream GetRangeResponse);
 
   // Returns homomorphic or regular hash of object's payload range after

status/types.proto

@@ -112,6 +112,9 @@ enum Object {
 
     // [**2051**] Locking an object with a non-REGULAR type rejected.
     LOCK_NON_REGULAR_OBJECT = 3;
+
+    // [**2052**] Object has been marked deleted.
+    OBJECT_ALREADY_REMOVED = 4;
 }
 
 // Section of statuses for container-related operations.