[flagd-ui] add back legacy REST APIs to empower programmatic usage

CHANGELOG.md

@@ -22,6 +22,7 @@ the release.
   ([#2644](https://github.com/open-telemetry/opentelemetry-demo/pull/2644))
 * [frontend] fix item calculation and shipping
   ([#2684](https://github.com/open-telemetry/opentelemetry-demo/pull/2684))
+* [flagd-ui] add back legacy REST APIs to empower programmatic usage ([#2720](https://github.com/open-telemetry/opentelemetry-demo/pull/2720))
 
 ## 2.1.3
 

src/flagd-ui/lib/flagd_ui_web/controllers/feature_controller.ex

@@ -9,4 +9,11 @@ defmodule FlagdUiWeb.FeatureController do
 
     json(conn, %{"flags" => flags})
   end
+
+  def write(conn, %{"data" => data}) do
+    payload = Jason.encode!(data)
+    GenServer.cast(Storage, {:replace, payload})
+
+    json(conn, %{})
+  end
 end

src/flagd-ui/lib/flagd_ui_web/router.ex

@@ -29,6 +29,9 @@ defmodule FlagdUiWeb.Router do
     pipe_through :api
 
     get "/read", FeatureController, :read
+    get "/read-file", FeatureController, :read
+    post "/write", FeatureController, :write
+    post "/write-to-file", FeatureController, :write
   end
 
   # Enable LiveDashboard and Swoosh mailbox preview in development

src/flagd-ui/mix.exs

@@ -7,7 +7,7 @@ defmodule FlagdUi.MixProject do
   def project do
     [
       app: :flagd_ui,
-      version: "0.1.0",
+      version: "0.1.1",
       elixir: "~> 1.15",
       elixirc_paths: elixirc_paths(Mix.env()),
       start_permanent: Mix.env() == :prod,

src/flagd-ui/test/flagd_ui_web/controllers/feature_controller_test.exs

@@ -0,0 +1,136 @@
+# Copyright The OpenTelemetry Authors
+# SPDX-License-Identifier: Apache-2.0
+
+defmodule FlagdUiWeb.FeatureControllerTest do
+  use FlagdUiWeb.ConnCase
+
+  setup do
+    file_content = GenServer.call(Storage, :read)
+
+    on_exit(fn ->
+      GenServer.cast(Storage, {:replace, Jason.encode!(file_content)})
+    end)
+  end
+
+  test "GET /api/read", %{conn: conn} do
+    conn = get(conn, ~p"/api/read")
+
+    assert %{
+             "flags" => %{
+               "adFailure" => %{
+                 "defaultVariant" => "off",
+                 "description" => "Fail ad service",
+                 "state" => "ENABLED",
+                 "variants" => %{"off" => false, "on" => true}
+               },
+               "adHighCpu" => %{
+                 "defaultVariant" => "off",
+                 "description" => "Triggers high cpu load in the ad service",
+                 "state" => "ENABLED",
+                 "variants" => %{"off" => false, "on" => true}
+               }
+             }
+           } = json_response(conn, 200)
+  end
+
+  test "GET /api/read-file (legacy API)", %{conn: conn} do
+    conn = get(conn, ~p"/api/read-file")
+
+    assert %{
+             "flags" => %{
+               "adFailure" => %{
+                 "defaultVariant" => "off",
+                 "description" => "Fail ad service",
+                 "state" => "ENABLED",
+                 "variants" => %{"off" => false, "on" => true}
+               },
+               "adHighCpu" => %{
+                 "defaultVariant" => "off",
+                 "description" => "Triggers high cpu load in the ad service",
+                 "state" => "ENABLED",
+                 "variants" => %{"off" => false, "on" => true}
+               }
+             }
+           } = json_response(conn, 200)
+  end
+
+  test "POST /api/write", %{conn: conn} do
+    data = %{
+      "flags" => %{
+        "adFailure" => %{
+          "defaultVariant" => "off",
+          "description" => "Fail ad service",
+          "state" => "ENABLED",
+          "variants" => %{"off" => true, "on" => false}
+        },
+        "adHighCpu" => %{
+          "defaultVariant" => "off",
+          "description" => "Triggers high cpu load in the ad service",
+          "state" => "ENABLED",
+          "variants" => %{"off" => true, "on" => false}
+        }
+      }
+    }
+
+    conn = post(conn, ~p"/api/write", %{"data" => data})
+
+    conn = get(conn, ~p"/api/read")
+
+    assert %{
+             "flags" => %{
+               "adFailure" => %{
+                 "defaultVariant" => "off",
+                 "description" => "Fail ad service",
+                 "state" => "ENABLED",
+                 "variants" => %{"off" => true, "on" => false}
+               },
+               "adHighCpu" => %{
+                 "defaultVariant" => "off",
+                 "description" => "Triggers high cpu load in the ad service",
+                 "state" => "ENABLED",
+                 "variants" => %{"off" => true, "on" => false}
+               }
+             }
+           } = json_response(conn, 200)
+  end
+
+  test "POST /api/write-to-file (legacy API)", %{conn: conn} do
+    data = %{
+      "flags" => %{
+        "adFailure" => %{
+          "defaultVariant" => "off",
+          "description" => "Fail ad service",
+          "state" => "ENABLED",
+          "variants" => %{"off" => true, "on" => false}
+        },
+        "adHighCpu" => %{
+          "defaultVariant" => "off",
+          "description" => "Triggers high cpu load in the ad service",
+          "state" => "ENABLED",
+          "variants" => %{"off" => true, "on" => false}
+        }
+      }
+    }
+
+    conn = post(conn, ~p"/api/write-to-file", %{"data" => data})
+
+    conn = get(conn, ~p"/api/read-file")
+
+    assert %{
+             "flags" => %{
+               "adFailure" => %{
+                 "defaultVariant" => "off",
+                 "description" => "Fail ad service",
+                 "state" => "ENABLED",
+                 "variants" => %{"off" => true, "on" => false}
+               },
+               "adHighCpu" => %{
+                 "defaultVariant" => "off",
+                 "description" => "Triggers high cpu load in the ad service",
+                 "state" => "ENABLED",
+                 "variants" => %{"off" => true, "on" => false}
+               }
+             }
+           } = json_response(conn, 200)
+  end
+end