syntax = "proto3";

package neo.fs.v2.status;

option go_package = "git.frostfs.info/TrueCloudLab/frostfs-api-go/v2/status/grpc;status";
option csharp_namespace = "Neo.FileStorage.API.Status";

// Declares the general format of the status returns of the NeoFS RPC protocol.
// Status is present in all response messages. Each RPC of NeoFS 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 NeoFS 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;
}

// Section of NeoFS 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 NeoFS network.
    // Details:
    //  - [**0**] Magic number of the served NeoFS 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;
}

// 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;
}

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

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