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resource_finder.ex
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resource_finder.ex
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defmodule K8s.Discovery.ResourceFinder do
@moduledoc """
Kubernetes API Groups
"""
alias K8s.Discovery.ResourceNaming
@type error_t :: {:error, K8s.Discovery.Error.t()}
@doc """
Get the REST resource name for a kubernetes `Kind`.
Since `K8s.Operation` is abstracted away from a specific cluster, when working with kubernetes resource `Map`s and specifying `"kind"` the `K8s.Operation.Path` module isn't
able to determine the correct path. (It will generate things like /api/v1/Pod instead of api/v1/pods).
Also accepts REST resource name in the event they are provided, as it may be known in the event of subresources.
"""
@spec resource_name_for_kind(K8s.Conn.t(), binary(), binary()) ::
{:ok, binary()}
| error_t
def resource_name_for_kind(conn, api_version, name_or_kind) do
case find_resource(conn, api_version, name_or_kind) do
{:ok, %{"name" => name}} ->
{:ok, name}
error ->
error
end
end
@doc """
Finds a resource definition by api version and (name or kind).
"""
@spec find_resource(K8s.Conn.t(), binary(), atom() | binary()) ::
{:ok, map}
| error_t
def find_resource(conn, api_version, name_or_kind) do
with {:ok, resources} <- conn.discovery_driver.resources(api_version, conn) do
find_resource_by_name(resources, name_or_kind)
end
end
@doc false
@spec find_resource_by_name(list(map), atom() | binary()) ::
{:ok, map} | error_t
def find_resource_by_name(resources, name_or_kind) do
resource = Enum.find(resources, &ResourceNaming.matches?(&1, name_or_kind))
case resource do
nil ->
{:error,
%K8s.Discovery.Error{message: "Unsupported Kubernetes resource: #{name_or_kind}"}}
resource ->
{:ok, resource}
end
end
end