301 lines
9.2 KiB
Django/Jinja
301 lines
9.2 KiB
Django/Jinja
{#- -*- coding: utf-8 -*- #}
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{#- vim: ft=jinja #}
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{#- Get the `tplroot` from `tpldir` #}
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{%- set tplroot = tpldir.split("/")[0] %}
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{%- from tplroot ~ "/libmatchers.jinja" import parse_matchers, query_map %}
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{%- set _default_config_dirs = [
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"parameters/",
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tplroot ~ "/parameters"
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] %}
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{%- macro mapstack(
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matchers,
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defaults=None,
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dirs=_default_config_dirs,
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log_prefix="libmapstack: "
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) %}
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{#-
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Load configuration in the order of `matchers` and merge
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successively the values with `defaults`.
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The `matchers` are processed using `libmatchers.jinja` to select
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the configuration sources from where the values are loaded.
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Parameters:
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- `matchers`: list of matchers in the form
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`[<TYPE>[:<OPTION>[:<DELIMITER>]]@]<QUERY>`
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- `defaults`: dictionary of default values to start the merging,
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they are considered built-ins. It must conform to the same
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layout as the YAML files: a mandatory `values` key and two
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optional `strategy` and `merge_lists` keys.
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- `dirs`: list of directory where to look-up the configuration
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file matching the matchers, by default a global `salt://parameters/`
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and a per formula `salt://<tplroot>/parameters`
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- `log_prefix`: prefix used in the log outputs, by default it is
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`libmapstack: `
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Example: On a Debian system with `roles=["nginx/server", "telegraf"]`
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{%- set settings = mapstack(
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matchers=[
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"Y:G@os_family",
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"I@" ~ tplroot,
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"Y:C@roles",
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],
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dirs=["defaults", tplroot ~ "/parameters"],
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)
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| load_yaml %}
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This will merge the values:
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- starting with the default empty dictionary `{}` (no
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`defaults` parameter)
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- from the YAML files
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- `salt://defaults/os_family/Debian.yaml`
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- `salt://{{ tplroot }}/parameters/os_family/Debian.yaml`
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- from the pillar `salt["pillar.get"](tplroot)`
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- from the `nginx/server` YAML files:
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- `salt://defaults/roles/nginx/server.yaml`
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- `salt://{{ tplroot }}/parameters/roles/nginx/server.yaml`
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- from the `telegraf` YAML files:
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- `salt://defaults/roles/telegraf.yaml`
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- `salt://{{ tplroot }}/parameters/roles/telegraf.yaml`
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Each YAML file and the `defaults` parameters must conform to the
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following layout:
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- a mandatory `values` key to store the configuration values
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- two optional keys to configure the use of `salt.slsutil.merge`
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- an optional `strategy` key to configure the merging
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strategy, for example `strategy: 'recurse'`, the default is
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`smart`
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- an optional `merge_lists` key to configure if lists should
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be merged or overridden for the `recurse` and `overwrite`
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strategies, for example `merge_lists: 'true'`
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#}
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{%- set stack = defaults | default({"values": {} }, boolean=True) %}
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{#- Build configuration file names based on matchers #}
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{%- set matchers = parse_matchers(
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matchers,
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log_prefix=log_prefix
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)
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| load_yaml %}
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{%- do salt["log.debug"](
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log_prefix
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~ "built-in configuration:\n"
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~ {"values": defaults | traverse("values")}
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| yaml(False)
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) %}
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{%- for param_dir in dirs %}
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{%- for matcher in matchers %}
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{#- `slsutil.merge` options from #}
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{#- 1. the `value` #}
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{#- 2. the `defaults` #}
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{#- 3. the built-in #}
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{%- set strategy = matcher.value
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| traverse(
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"strategy",
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defaults
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| traverse(
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"strategy",
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"smart"
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)
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) %}
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{%- set merge_lists = matcher.value
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| traverse(
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"merge_lists",
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defaults
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| traverse(
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"merge_lists",
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False
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)
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)
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| to_bool %}
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{%- if matcher.type in query_map.keys() %}
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{#- No value is an empty list, must be a dict for `stack.update` #}
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{%- set normalized_value = matcher.value | default({}, boolean=True) %}
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{#- Merge in `mapdata.<query>` instead of directly in `mapdata` #}
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{%- set is_sub_key = matcher.option | default(False) == "SUB" %}
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{%- if is_sub_key %}
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{#- Merge values with `mapdata.<key>`, `<key>` and `<key>:lookup` are merged together #}
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{%- set value = { matcher.query | regex_replace(":lookup$", ""): normalized_value } %}
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{%- else %}
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{%- set value = normalized_value %}
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{%- endif %}
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{%- do salt["log.debug"](
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log_prefix
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~ "merge "
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~ "sub key " * is_sub_key
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~ "'"
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~ matcher.query
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~ "' retrieved with '"
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~ matcher.query_method
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~ "', merge: strategy='"
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~ strategy
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~ "', lists='"
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~ merge_lists
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~ "':\n"
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~ value
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| yaml(False)
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) %}
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{%- do stack.update(
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{
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"values": salt["slsutil.merge"](
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stack["values"],
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value,
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strategy=strategy,
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merge_lists=merge_lists,
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)
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}
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) %}
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{%- else %}
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{#- Load YAML file matching the grain/pillar/... #}
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{#- Fallback to use the source name as a direct filename #}
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{%- if matcher.value | length == 0 %}
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{#- Mangle `matcher.value` to use it as literal path #}
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{%- set query_parts = matcher.query.split("/") %}
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{%- set yaml_dirname = query_parts[0:-1] | join("/") %}
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{%- set yaml_names = query_parts[-1] %}
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{%- else %}
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{%- set yaml_dirname = matcher.query %}
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{%- set yaml_names = matcher.value %}
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{%- endif %}
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{#- Some configuration return list #}
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{%- if yaml_names is string %}
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{%- set yaml_names = [yaml_names] %}
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{%- endif %}
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{#- `yaml_dirname` can be an empty string with literal path like `myconf.yaml` #}
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{%- set yaml_dir = [
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param_dir,
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yaml_dirname
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]
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| select
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| join("/") %}
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{%- for yaml_name in yaml_names %}
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{#- Make sure to have a `.yaml` extension #}
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{#- Use `.rpartition` to strip last `.yaml` in `dir.yaml/file.yaml` #}
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{%- set yaml_filename = [
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yaml_dir.rstrip("/"),
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yaml_name.rpartition(".yaml")
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| reject("equalto", ".yaml")
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| join
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~ ".yaml"
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]
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| select
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| join("/") %}
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{%- do salt["log.debug"](
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log_prefix
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~ "load configuration values from "
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~ yaml_filename
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) %}
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{%- load_yaml as yaml_values %}
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{%- include yaml_filename ignore missing %}
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{%- endload %}
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{%- if yaml_values %}
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{%- do salt["log.debug"](
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log_prefix
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~ "loaded configuration values from "
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~ yaml_name
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~ ":\n"
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~ yaml_values
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| yaml(False)
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) %}
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{#- `slsutil.merge` options from #}
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{#- 1. the `value` #}
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{#- 2. the `defaults` #}
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{#- 3. the built-in #}
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{%- set strategy = yaml_values
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| traverse(
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"strategy",
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defaults
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| traverse(
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"strategy",
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"smart"
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)
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) %}
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{%- set merge_lists = yaml_values
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| traverse(
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"merge_lists",
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defaults
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| traverse(
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"merge_lists",
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False
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)
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)
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| to_bool %}
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{%- do stack.update(
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{
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"values": salt["slsutil.merge"](
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stack["values"],
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yaml_values
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| traverse("values", {}),
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strategy=strategy,
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merge_lists=merge_lists,
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)
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}
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) %}
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{%- do salt["log.debug"](
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log_prefix
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~ "merged configuration values from "
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~ yaml_name
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~ ", merge: strategy='"
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~ strategy
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~ "', merge_lists='"
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~ merge_lists
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~ "':\n"
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~ {"values": stack["values"]}
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| yaml(False)
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) %}
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{%- endif %}
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{%- endfor %}
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{%- endif %}
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{%- endfor %}
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{%- endfor %}
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{%- do salt["log.debug"](
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log_prefix
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~ "final configuration values:\n"
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~ {"values": stack["values"]}
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| yaml(False)
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) %}
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{#- Output stack as YAML, caller should use with something like #}
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{#- `{%- set config = mapstack(matchers=["foo"]) | load_yaml %}` #}
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{{ stack | yaml }}
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{%- endmacro %}
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