patroni --generate-config machinery.

class patroni.config_generator. AbstractConfigGenerator ( output_file : str | None ) View on GitHub

Bases: ABC

Object representing the generated Patroni config.

Variables :

  • output_file – full path to the output file to be used.

  • pg_major – integer representation of the major PostgreSQL version.

  • config – dictionary used for the generated configuration storage.

_HOSTNAME = 'build-rhel9.packaging.crunchydata.com'
_IP = '192.168.13.224'
__init__ ( output_file : str | None ) → None View on GitHub

Set up the output file (if passed), helper vars and the minimal config structure.

Parameters :

output_file – full path to the output file to be used.

_abc_impl = <_abc._abc_data object>
static _format_block ( block : Any , line_prefix : str = '' ) → str View on GitHub

Format a single YAML block.

Note

Optionally the formatted block could be indented with the line_prefix

Parameters :

  • block – the object that should be formatted to YAML.

  • line_prefix – is used for indentation.

Returns :

a formatted and indented block .

_format_config ( ) → Iterator [ str ] View on GitHub

Format current config and enrich it with some comments.

Yields :

formatted lines or blocks that represent a text output of the YAML document.

_format_config_section ( section_name : str ) → Iterator [ str ] View on GitHub

Format and yield as single section of the current config .

Note

If the section is a dict object we put an empty line before it.

Parameters :

section_name – a section name in the config .

Yields :

a formatted section in case if it exists in the config .

_write_config_to_fd ( fd : TextIO ) → None View on GitHub

Format and write current config to provided file descriptor.

Parameters :

fd – where to write the config file. Could be sys.stdout or the real file.

abstract generate ( ) → None View on GitHub

Generate config and store in config .

classmethod get_template_config ( ) → Dict [ str , Any ] View on GitHub

Generate a template config for further extension (e.g. in the inherited classes).

Returns :

dictionary with the values gathered from Patroni env, hopefully defined hostname and ip address (otherwise set to NO_VALUE_MSG ), and some sane defaults.

write_config ( ) → None View on GitHub

Write current config to the output file if provided, to stdout otherwise.

class patroni.config_generator. RunningClusterConfigGenerator ( output_file : str | None = None , dsn : str | None = None ) View on GitHub

Bases: AbstractConfigGenerator

Object representing the Patroni config generated using information gathered from the running instance.

Variables :

  • dsn – DSN string for the local instance to get GUC values from (if provided).

  • parsed_dsn – DSN string parsed into a dictionary (see parse_dsn() ).

__init__ ( output_file : str | None = None , dsn : str | None = None ) → None View on GitHub

Additionally store the passed dsn (if any) in both original and parsed version and run config generation.

Parameters :

  • output_file – full path to the output file to be used.

  • dsn – DSN string for the local instance to get GUC values from.

Raises :

PatroniException : if DSN parsing failed.

_abc_impl = <_abc._abc_data object>
_enrich_config_from_running_instance ( ) → None View on GitHub

Extend config with the values gathered from the running instance.

Retrieve the following information from the running PostgreSQL instance:

And redefine scope with the cluster_name GUC value if set.

Raises :

PatroniException : if the provided user doesn’t have superuser privileges.

_get_bin_dir_from_running_instance ( ) → str View on GitHub

Define the directory postgres binaries reside using postmaster’s pid executable.

Returns :

path to the PostgreSQL binaries directory.

Raises :

PatroniException : if:

  • pid could not be obtained from the postmaster.pid file; or

  • OSError occured during postmaster.pid file handling; or

  • the obtained postmaster pid doesn’t exist.

_get_connection_cursor ( ) → Iterator [ cursor | Cursor [ Any ] ] View on GitHub

Get cursor for the PG connection established based on the stored information.

Raises :

PatroniException : if psycopg.Error occured.

property _get_hba_conn_types : Tuple [ str , ... ] View on GitHub

Return the connection types allowed.

If pg_major is defined, adds additional parameters for PostgreSQL version >=16.

Returns :

tuple of the connection methods allowed.

property _required_pg_params : List [ str ] View on GitHub

PG configuration prameters that have to be always present in the generated config.

Returns :

list of the parameter names.

_set_conf_files ( ) → None View on GitHub

Extend config with pg_hba.conf and pg_ident.conf content.

Note

This function only defines postgresql.pg_hba and postgresql.pg_ident when hba_file and ident_file are set to the defaults. It may happen these files are located outside of PGDATA and Patroni doesn’t have write permissions for them.

Raises :

PatroniException : if OSError occured during the conf files handling.

_set_pg_params ( cur : cursor | Cursor [ Any ] ) → None View on GitHub

Extend config with the actual PG GUCs values.

THe following GUC values are set:

  • Non-internal having configuration file, postmaster command line or environment variable as a source.

  • List of the always required parameters (see _required_pg_params() ).

Parameters :

cur – connection cursor to use.

_set_su_params ( ) → None View on GitHub

Extend config with the superuser auth information.

Information set is based on the options used for connection.

generate ( ) → None View on GitHub

Generate config using the info gathered from the specified running PG instance.

Result is written to config .

class patroni.config_generator. SampleConfigGenerator ( output_file : str | None ) View on GitHub

Bases: AbstractConfigGenerator

Object representing the generated sample Patroni config.

Sane defults are used based on the gathered PG version.

_abc_impl = <_abc._abc_data object>
_get_int_major_version ( ) → int View on GitHub

Get major PostgreSQL version from the binary as an integer.

Returns :

an integer PostgreSQL major version representation gathered from the PostgreSQL binary. See postgres_major_version_to_int() and get_major_version() .

generate ( ) → None View on GitHub

Generate sample config using some sane defaults and update config .

property get_auth_method : str View on GitHub

Return the preferred authentication method for a specific PG version if provided or the default md5 .

Returns :

str value for the preferred authentication method.

patroni.config_generator. generate_config ( output_file : str , sample : bool , dsn : str | None ) → None View on GitHub

Generate Patroni configuration file.

Parameters :

  • output_file – Full path to the configuration file to be used. If not provided, result is sent to stdout .

  • sample – Optional flag. If set, no source instance will be used - generate config with some sane defaults.

  • dsn – Optional DSN string for the local instance to get GUC values from.

patroni.config_generator. get_address ( ) → Tuple [ str , str ] View on GitHub

Try to get hostname and the ip address for it returned by gethostname() .

Note

Can also return local ip.

Returns :

tuple consisting of the hostname returned by gethostname() and the first element in the sorted list of the addresses returned by getaddrinfo() . Sorting guarantees it will prefer IPv4. If an exception occured, hostname and ip values are equal to NO_VALUE_MSG .