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Kubernetes API Client for Elixir
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lib/k8s/resource/named_list.ex
defmodule K8s.Resource.NamedList do
@moduledoc """
Provides an accessor to a list of maps whereas each element in the list has a key named "name". The name should
be unique within the list and therefore defining the element.
## Examples
iex> get_in([%{"name" => "key1", "value" => "value1"}, %{"name" => "key2", "value" => "value2"}], [K8s.Resource.NamedList.access("key2"), "value"])
"value2"
iex> put_in([%{"name" => "key1", "value" => "value1"}, %{"name" => "key2", "value" => "value2"}], [K8s.Resource.NamedList.access("key1"), "value"], "value_new")
[%{"name" => "key1", "value" => "value_new"}, %{"name" => "key2", "value" => "value2"}]
iex> pop_in([%{"name" => "key1", "value" => "value1"}, %{"name" => "key2", "value" => "value2"}], [K8s.Resource.NamedList.access("key1"), "value"])
{"value1", [%{"name" => "key1"}, %{"name" => "key2", "value" => "value2"}]}
"""
@spec access(binary) :: Access.access_fun(data :: list(), get_value :: term)
def access(name) do
fn op, data, next ->
if Enum.count(data, match_name_callback(name)) > 1 do
raise ArgumentError, "The name #{name} is not unique in the given list: #{inspect(data)}"
end
access(op, data, name, next)
end
end
defp access(:get, data, name, next) when is_list(data) do
data |> Enum.find(match_name_callback(name)) |> next.()
end
defp access(:get_and_update, data, name, next) when is_list(data) do
index = Enum.find_index(data, match_name_callback(name))
{value, rest} = List.pop_at(data, index)
case next.(value) do
{get, update} -> {get, [update | rest]}
:pop -> {value, rest}
end
end
defp access(_op, data, _name, _next) do
raise ArgumentError,
"Kubernetes.NamedList.access/1 expected a named list, got: #{inspect(data)}"
end
defp match_name_callback(name), do: &(&1["name"] == name)
end