gRPC is a Remote Procedure Call used when you're tired of fixing JSON schema errors and paying CPU time parsing quotes and braces.
OK (0): The operation completed successfully.
CANCELLED (1): The operation was cancelled, typically by the caller.
UNKNOWN (2): An unknown error occurred. This may be used for errors that don't fit other codes.
INVALID_ARGUMENT (3): The client specified an invalid argument. Indicates arguments that are problematic regardless of the state of the system.
DEADLINE_EXCEEDED (4): The deadline expired before the operation could complete. This can happen if a client-specified deadline or the default system deadline is exceeded.
NOT_FOUND (5): Some requested entity (e.g., file or directory) was not found.
ALREADY_EXISTS (6): The entity that a client attempted to create (e.g., file or directory) already exists.
PERMISSION_DENIED (7): The caller does not have permission to execute the specified operation.
RESOURCE_EXHAUSTED (8): Some resource has been exhausted, perhaps a per-user quota, or perhaps the entire file system is out of space.
FAILED_PRECONDITION (9): The operation was rejected because the system is not in a state required for the operation's execution.
ABORTED (10): The operation was aborted, typically due to a concurrency issue like sequencer check failures, transaction aborts, etc.
OUT_OF_RANGE (11): The operation was attempted past the valid range. Unlike `INVALID_ARGUMENT`, this error indicates a problem that may be fixed if the system state changes.
UNIMPLEMENTED (12): The operation is not implemented or is not supported/enabled in this service.
INTERNAL (13): An internal error occurred. This means some invariants expected by the underlying system have been broken. This error code is reserved for serious errors.
UNAVAILABLE (14): The service is currently unavailable. This is most likely a transient condition, which can be corrected by retrying with a backoff.
DATA_LOSS (15): Unrecoverable data loss or corruption.
UNAUTHENTICATED (16): The request does not have valid authentication credentials for the operation.
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