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#region Copyright notice and license

// Copyright 2015, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#endregion

using System;

namespace Grpc.Core
{
    /// <summary>
    /// Result of a remote procedure call.
    /// Based on grpc_status_code from grpc/status.h
    /// </summary>
    public enum StatusCode
    {
        /* Not an error; returned on success */
        OK = 0,
        /* The operation was cancelled (typically by the caller). */
        Cancelled = 1,
        /* Unknown error.  An example of where this error may be returned is
     if a Status value received from another address space belongs to
     an error-space that is not known in this address space.  Also
     errors raised by APIs that do not return enough error information
     may be converted to this error. */
        Unknown = 2,
        /* Client specified an invalid argument.  Note that this differs
     from FAILED_PRECONDITION.  INVALID_ARGUMENT indicates arguments
     that are problematic regardless of the state of the system
     (e.g., a malformed file name). */
        InvalidArgument = 3,
        /* Deadline expired before operation could complete.  For operations
     that change the state of the system, this error may be returned
     even if the operation has completed successfully.  For example, a
     successful response from a server could have been delayed long
     enough for the deadline to expire. */
        DeadlineExceeded = 4,
        /* Some requested entity (e.g., file or directory) was not found. */
        NotFound = 5,
        /* Some entity that we attempted to create (e.g., file or directory)
     already exists. */
        AlreadyExists = 6,
        /* The caller does not have permission to execute the specified
     operation.  PERMISSION_DENIED must not be used for rejections
     caused by exhausting some resource (use RESOURCE_EXHAUSTED
     instead for those errors).  PERMISSION_DENIED must not be
     used if the caller can not be identified (use UNAUTHENTICATED
     instead for those errors). */
        PermissionDenied = 7,
        /* The request does not have valid authentication credentials for the
     operation. */
        Unauthenticated = 16,
        /* Some resource has been exhausted, perhaps a per-user quota, or
     perhaps the entire file system is out of space. */
        ResourceExhausted = 8,
        /* Operation was rejected because the system is not in a state
     required for the operation's execution.  For example, directory
     to be deleted may be non-empty, an rmdir operation is applied to
     a non-directory, etc.

     A litmus test that may help a service implementor in deciding
     between FAILED_PRECONDITION, ABORTED, and UNAVAILABLE:
      (a) Use UNAVAILABLE if the client can retry just the failing call.
      (b) Use ABORTED if the client should retry at a higher-level
          (e.g., restarting a read-modify-write sequence).
      (c) Use FAILED_PRECONDITION if the client should not retry until
          the system state has been explicitly fixed.  E.g., if an "rmdir"
          fails because the directory is non-empty, FAILED_PRECONDITION
          should be returned since the client should not retry unless
          they have first fixed up the directory by deleting files from it.
      (d) Use FAILED_PRECONDITION if the client performs conditional
          REST Get/Update/Delete on a resource and the resource on the
          server does not match the condition. E.g., conflicting
          read-modify-write on the same resource. */
        FailedPrecondition = 9,
        /* The operation was aborted, typically due to a concurrency issue
     like sequencer check failures, transaction aborts, etc.

     See litmus test above for deciding between FAILED_PRECONDITION,
     ABORTED, and UNAVAILABLE. */
        Aborted = 10,
        /* Operation was attempted past the valid range.  E.g., seeking or
     reading past end of file.

     Unlike INVALID_ARGUMENT, this error indicates a problem that may
     be fixed if the system state changes. For example, a 32-bit file
     system will generate INVALID_ARGUMENT if asked to read at an
     offset that is not in the range [0,2^32-1], but it will generate
     OUT_OF_RANGE if asked to read from an offset past the current
     file size.

     There is a fair bit of overlap between FAILED_PRECONDITION and
     OUT_OF_RANGE.  We recommend using OUT_OF_RANGE (the more specific
     error) when it applies so that callers who are iterating through
     a space can easily look for an OUT_OF_RANGE error to detect when
     they are done. */
        OutOfRange = 11,
        /* Operation is not implemented or not supported/enabled in this service. */
        Unimplemented = 12,
        /* Internal errors.  Means some invariants expected by underlying
     system has been broken.  If you see one of these errors,
     something is very broken. */
        Internal = 13,
        /* The service is currently unavailable.  This is a most likely a
     transient condition and may be corrected by retrying with
     a backoff.

     See litmus test above for deciding between FAILED_PRECONDITION,
     ABORTED, and UNAVAILABLE. */
        Unavailable = 14,
        /* Unrecoverable data loss or corruption. */
        DataLoss = 15
    }
}