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update_docs.ex
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update_docs.ex
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defmodule Mix.Tasks.UpdateDocs do
@moduledoc """
Uses actual configuration defaults for updating the operator's guide.
"""
use Mix.Task
require Logger
@header """
-------- | ----------- | -------
"""
@erlang_envs ["NODE_HOST", "NODE_COOKIE"]
@target_path "./docs/rig-ops-guide.md"
@shortdoc "Uses actual configuration defaults for updating the operator's guide."
def run(_) do
# Only run when MIX_ENV=PROD for correct default values:
if Mix.env() == :prod do
if File.exists?(@target_path) do
update_file(@target_path)
else
Logger.info(fn -> "Not updating documentation (file not present: #{@target_path})" end)
end
end
end
defp all_envs do
Application.get_all_env(:rig)
end
def update_file(filename, env \\ all_envs()) do
defaults =
env_defaults(env)
|> log_duplicate_defaults()
|> Map.new()
{above_table, table, below_table} =
filename
|> read_file()
|> find_table_in_text()
table_list = text_to_list(table)
keysets = extract_keysets(table_list, defaults)
log_undocumented_vars(keysets)
log_documented_but_missing_vars(keysets)
{table_list, updated_keys} = set_defaults(table_list, defaults)
log_updated_vars(updated_keys)
# Write back to disk:
table = list_to_text(table_list)
content = above_table <> table <> below_table
write_file(filename, content)
end
def find_table_in_text(text) do
[above_header, below_header] = String.split(text, @header, parts: 2)
[table, below_table] = String.split(below_header, "\n\n", parts: 2)
{above_header <> @header, table, "\n\n" <> below_table}
end
def text_to_list(table_text) do
table_text
|> String.split("\n")
|> Enum.map(fn line ->
line
|> String.split("|")
|> Enum.map(&String.trim/1)
|> Enum.map(&String.trim(&1, "`"))
|> List.to_tuple()
end)
end
def list_to_text(table_list) do
table_list
|> Enum.map(&Tuple.to_list/1)
|> Enum.map(&Enum.join(&1, " | "))
|> Enum.join("\n")
end
def log_duplicate_defaults(defaults) do
defaults
|> Enum.reduce(%{}, fn {key, value}, acc ->
case Map.fetch(acc, key) do
{:ok, ^value} ->
# Multiple definitions are okay if the same default is used
acc
{:ok, other_value} ->
Logger.warn(
"More than one default value found for environment variable #{key}: #{inspect(value)} and #{
inspect(other_value)
}"
)
acc
:error ->
Map.put(acc, key, value)
end
end)
end
def extract_keysets(table, defaults) do
table_keyset =
table
|> Enum.map(fn {key, _, _} -> key end)
|> MapSet.new()
env_keyset =
defaults
|> Enum.map(fn {key, _} -> key end)
|> MapSet.new()
{table_keyset, env_keyset}
end
def log_undocumented_vars({table_keyset, env_keyset}) do
env_keyset
|> MapSet.difference(table_keyset)
|> Enum.each(fn key ->
Logger.warn("Documentation for environment variable #{key} is missing")
end)
end
def log_documented_but_missing_vars({table_keyset, env_keyset}) do
@erlang_envs
|> MapSet.new()
|> MapSet.difference(table_keyset)
|> MapSet.difference(env_keyset)
|> Enum.each(fn key ->
Logger.warn("Documentation for environment variable #{key} is missing")
end)
end
def log_updated_vars(updated_keys) do
updated_keys
|> Enum.each(fn key ->
Logger.info("Default value for environment variable #{key} updated")
end)
end
def set_defaults(table_list, defaults) do
{updated_table, updated_keys} =
table_list
|> Enum.reduce({_table = [], _keys = MapSet.new()}, fn {key, desc, last_default},
{table, keys} = _acc ->
cur_default_str = Map.get(defaults, key, nil) |> inspect()
keys = if last_default == cur_default_str, do: keys, else: MapSet.put(keys, key)
table = table ++ [{"`#{key}`", desc, cur_default_str}]
{table, keys}
end)
{updated_table, updated_keys}
end
defp nested_envs(envs) do
{flat_env, list_env} =
Enum.split_with(envs, fn
{_, _} -> true
_ -> false
end)
list_env
|> List.flatten()
|> Enum.concat(flat_env)
|> Enum.reject(&is_nil/1)
end
def env_defaults(env) do
env
|> Enum.flat_map(fn {_mod, kwlist} -> List.wrap(kwlist) end)
|> Enum.map(fn
{_, {:system, key, val}} ->
{key, val}
{_, {:system, _, key, val}} ->
{key, val}
{_, list_env = [_ | _]} ->
Enum.map(list_env, fn
{_, {:system, key, val}} -> {key, val}
{_, {:system, _, key, val}} -> {key, val}
_ -> nil
end)
_ ->
nil
end)
|> Enum.reject(&is_nil/1)
|> nested_envs
end
def read_file(filename) do
file = File.open!(filename, [:read, :utf8])
all = IO.read(file, :all)
File.close(file)
all
end
def write_file(filename, content) do
file = File.open!(filename, [:write, :utf8])
IO.write(file, content)
File.close(file)
end
end