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/// https://godoc.org/google.golang.org/grpc/codes#Code
pub enum ErrorCode {
    /// OK is returned on success.
    OK = 0,

    /// Canceled indicates the operation was canceled (typically by the caller).
    Canceled = 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,

    /// InvalidArgument indicates client specified an invalid argument.
    /// Note that this differs from FailedPrecondition. It indicates arguments
    /// that are problematic regardless of the state of the system
    /// (e.g., a malformed file name).
    InvalidArgument = 3,

    /// DeadlineExceeded means operation expired before completion.
    /// 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,

    /// NotFound means some requested entity (e.g., file or directory) was
    /// not found.
    NotFound = 5,

    /// AlreadyExists means an attempt to create an entity failed because one
    /// already exists.
    AlreadyExists = 6,

    /// PermissionDenied indicates the caller does not have permission to
    /// execute the specified operation. It must not be used for rejections
    /// caused by exhausting some resource (use ResourceExhausted
    /// instead for those errors). It must not be
    /// used if the caller cannot be identified (use Unauthenticated
    /// instead for those errors).
    PermissionDenied = 7,

    /// ResourceExhausted indicates some resource has been exhausted, perhaps
    /// a per-user quota, or perhaps the entire file system is out of space.
    ResourceExhausted = 8,

    /// FailedPrecondition indicates 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 FailedPrecondition, 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 FailedPrecondition 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, FailedPrecondition
    ///      should be returned since the client should not retry unless
    ///      they have first fixed up the directory by deleting files from it.
    ///  (d) Use FailedPrecondition 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,

    /// Aborted indicates the operation was aborted, typically due to a
    /// concurrency issue like sequencer check failures, transaction aborts,
    /// etc.
    ///
    /// See litmus test above for deciding between FailedPrecondition,
    /// Aborted, and Unavailable.
    Aborted = 10,

    /// OutOfRange means operation was attempted past the valid range.
    /// E.g., seeking or reading past end of file.
    ///
    /// Unlike InvalidArgument, this error indicates a problem that may
    /// be fixed if the system state changes. For example, a 32-bit file
    /// system will generate InvalidArgument if asked to read at an
    /// offset that is not in the range [0,2^32-1], but it will generate
    /// OutOfRange if asked to read from an offset past the current
    /// file size.
    ///
    /// There is a fair bit of overlap between FailedPrecondition and
    /// OutOfRange. We recommend using OutOfRange (the more specific
    /// error) when it applies so that callers who are iterating through
    /// a space can easily look for an OutOfRange error to detect when
    /// they are done.
    OutOfRange = 11,

    /// Unimplemented indicates 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,

    /// Unavailable indicates the service is currently unavailable.
    /// This is a most likely a transient condition and may be corrected
    /// by retrying with a backoff. Note that it is not always safe to retry
    /// non-idempotent operations.
    ///
    /// See litmus test above for deciding between FailedPrecondition,
    /// Aborted, and Unavailable.
    Unavailable = 14,

    /// DataLoss indicates unrecoverable data loss or corruption.
    DataLoss = 15,

    /// Unauthenticated indicates the request does not have valid
    /// authentication credentials for the operation.
    Unauthenticated = 16,
}