syntax = "proto3";

package frost.fs.status;

// Declares the general format of the status returns of the FrostFS RPC
// protocol. Status is present in all response messages. Each RPC of FrostFS
// protocol describes the possible outcomes and details of the operation.
//
// Each status is assigned a one-to-one numeric code. Any unique result of an
// operation in FrostFS is unambiguously associated with the code value.
//
// Numerical set of codes is split into 1024-element sections. An enumeration
// is defined for each section. Values can be referred to in the following ways:
//
// * numerical value ranging from 0 to 4,294,967,295 (global code);
//
// * values from enumeration (local code). The formula for the ratio of the
//   local code (`L`) of a defined section (`S`) to the global one (`G`):
//   `G = 1024 * S + L`.
//
// All outcomes are divided into successful and failed, which corresponds
// to the success or failure of the operation. The definition of success
// follows the semantics of RPC and the description of its purpose.
// The server must not attach code that is the opposite of the outcome type.
//
// See the set of return codes in the description for calls.
//
// Each status can carry a developer-facing error message. It should be a human
// readable text in English. The server should not transmit (and the client
// should not expect) useful information in the message. Field `details`
// should make the return more detailed.
message Status {
  // The status code
  uint32 code = 1;

  // Developer-facing error message
  string message = 2;

  // Return detail. It contains additional information that can be used to
  // analyze the response. Each code defines a set of details that can be
  // attached to a status. Client should not handle details that are not
  // covered by the code.
  message Detail {
    // Detail ID. The identifier is required to determine the binary format
    // of the detail and how to decode it.
    uint32 id = 1;

    // Binary status detail. Must follow the format associated with ID.
    // The possibility of missing a value must be explicitly allowed.
    bytes value = 2;
  }

  // Data detailing the outcome of the operation. Must be unique by ID.
  repeated Detail details = 3;
}

// Section identifiers.
enum Section {
  // Successful return codes.
  SECTION_SUCCESS = 0;

  // Failure codes regardless of the operation.
  SECTION_FAILURE_COMMON = 1;

  // Object service-specific errors.
  SECTION_OBJECT = 2;

  // Container service-specific errors.
  SECTION_CONTAINER = 3;

  // Session service-specific errors.
  SECTION_SESSION = 4;

  // Session service-specific errors.
  SECTION_APE_MANAGER = 5;
}

// Section of FrostFS successful return codes.
enum Success {
  // [**0**] Default success. Not detailed.
  // If the server cannot match successful outcome to the code, it should
  // use this code.
  OK = 0;
}

// Section of failed statuses independent of the operation.
enum CommonFail {
  // [**1024**] Internal server error, default failure. Not detailed.
  // If the server cannot match failed outcome to the code, it should
  // use this code.
  INTERNAL = 0;

  // [**1025**] Wrong magic of the FrostFS network.
  // Details:
  //  - [**0**] Magic number of the served FrostFS network (big-endian 64-bit
  //  unsigned integer).
  WRONG_MAGIC_NUMBER = 1;

  // [**1026**] Signature verification failure.
  SIGNATURE_VERIFICATION_FAIL = 2;

  // [**1027**] Node is under maintenance.
  NODE_UNDER_MAINTENANCE = 3;

  // [**1028**] Invalid argument error. If the server fails on validation of a
  // request parameter as the client sent it incorrectly, then this code should
  // be used.
  INVALID_ARGUMENT = 4;
}

// Section of statuses for object-related operations.
enum Object {
  // [**2048**] Access denied by ACL.
  // Details:
  // - [**0**] Human-readable description (UTF-8 encoded string).
  ACCESS_DENIED = 0;

  // [**2049**] Object not found.
  OBJECT_NOT_FOUND = 1;

  // [**2050**] Operation rejected by the object lock.
  LOCKED = 2;

  // [**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;

  // [**2053**] Invalid range has been requested for an object.
  OUT_OF_RANGE = 5;
}

// Section of statuses for container-related operations.
enum Container {
  // [**3072**] Container not found.
  CONTAINER_NOT_FOUND = 0;

  // [**3073**] eACL table not found.
  EACL_NOT_FOUND = 1;

  // [**3074**] Container access denied.
  CONTAINER_ACCESS_DENIED = 2;
}

// Section of statuses for session-related operations.
enum Session {
  // [**4096**] Token not found.
  TOKEN_NOT_FOUND = 0;

  // [**4097**] Token has expired.
  TOKEN_EXPIRED = 1;
}

// Section of status for APE manager related operations.
enum APEManager {
  // [**5120**] The operation is denied by APE manager.
  APE_MANAGER_ACCESS_DENIED = 0;
}