Authoritative resolvers.
| Function | getSerial | Return a monotonically increasing (across program runs) integer. |
| Class | FileAuthority | An Authority that is loaded from a file. |
| Class | PySourceAuthority | A FileAuthority that is built up from Python source code. |
| Class | BindAuthority | An Authority that loads BIND zone files. |
Return a monotonically increasing (across program runs) integer.
State is stored in the given file. If it does not exist, it is created with rw-/---/--- permissions.
This manipulates process-global state by calling os.umask(), so it isn't thread-safe.
| Parameters | filename | Path to a file that is used to store the state across program runs. (type: str) |
| Returns | a monotonically increasing number (type: str) | |