include/grpc/impl/codegen/status.h

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#ifndef GRPC_IMPL_CODEGEN_STATUS_H
#define GRPC_IMPL_CODEGEN_STATUS_H

#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
  /** Not an error; returned on success */
  GRPC_STATUS_OK = 0,

  /** The operation was cancelled (typically by the caller). */
  GRPC_STATUS_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. */
  GRPC_STATUS_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). */
  GRPC_STATUS_INVALID_ARGUMENT = 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. */
  GRPC_STATUS_DEADLINE_EXCEEDED = 4,

  /** Some requested entity (e.g., file or directory) was not found. */
  GRPC_STATUS_NOT_FOUND = 5,

  /** Some entity that we attempted to create (e.g., file or directory)
     already exists. */
  GRPC_STATUS_ALREADY_EXISTS = 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). */
  GRPC_STATUS_PERMISSION_DENIED = 7,

  /** The request does not have valid authentication credentials for the
     operation. */
  GRPC_STATUS_UNAUTHENTICATED = 16,

  /** Some resource has been exhausted, perhaps a per-user quota, or
     perhaps the entire file system is out of space. */
  GRPC_STATUS_RESOURCE_EXHAUSTED = 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. */
  GRPC_STATUS_FAILED_PRECONDITION = 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. */
  GRPC_STATUS_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. */
  GRPC_STATUS_OUT_OF_RANGE = 11,

  /** Operation is not implemented or not supported/enabled in this service. */
  GRPC_STATUS_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. */
  GRPC_STATUS_INTERNAL = 13,

  /** The service is currently unavailable.  This is a most likely a
     transient condition and may be corrected by retrying with
     a backoff.

     WARNING: Although data MIGHT not have been transmitted when this
     status occurs, there is NOT A GUARANTEE that the server has not seen
     anything. So in general it is unsafe to retry on this status code
     if the call is non-idempotent.

     See litmus test above for deciding between FAILED_PRECONDITION,
     ABORTED, and UNAVAILABLE. */
  GRPC_STATUS_UNAVAILABLE = 14,

  /** Unrecoverable data loss or corruption. */
  GRPC_STATUS_DATA_LOSS = 15,

  /** Force users to include a default branch: */
  GRPC_STATUS__DO_NOT_USE = -1
} grpc_status_code;

#ifdef __cplusplus
}
#endif

#endif /* GRPC_IMPL_CODEGEN_STATUS_H */