Admin API: GET /api/pleroma/admin/stats to get status count by visibility scope

priv/repo/migrations/20200109123126_add_counter_cache_table.exs

@@ -0,0 +1,55 @@
+defmodule Pleroma.Repo.Migrations.AddCounterCacheTable do
+  use Ecto.Migration
+
+  def up do
+    create_if_not_exists table(:counter_cache) do
+      add(:name, :string, null: false)
+      add(:count, :bigint, null: false, default: 0)
+    end
+
+    create_if_not_exists(unique_index(:counter_cache, [:name]))
+
+    """
+    CREATE OR REPLACE FUNCTION update_status_visibility_counter_cache()
+    RETURNS TRIGGER AS
+    $$
+      DECLARE
+      BEGIN
+      IF TG_OP = 'INSERT' THEN
+          IF NEW.data->>'type' = 'Create' THEN
+            EXECUTE 'INSERT INTO counter_cache (name, count) VALUES (''status_visibility_' || activity_visibility(NEW.actor, NEW.recipients, NEW.data) || ''', 1) ON CONFLICT (name) DO UPDATE SET count = counter_cache.count + 1';
+          END IF;
+          RETURN NEW;
+      ELSIF TG_OP = 'UPDATE' THEN
+          IF (NEW.data->>'type' = 'Create') and (OLD.data->>'type' = 'Create') and activity_visibility(NEW.actor, NEW.recipients, NEW.data) != activity_visibility(OLD.actor, OLD.recipients, OLD.data) THEN
+             EXECUTE 'INSERT INTO counter_cache (name, count) VALUES (''status_visibility_' || activity_visibility(NEW.actor, NEW.recipients, NEW.data) || ''', 1) ON CONFLICT (name) DO UPDATE SET count = counter_cache.count + 1';
+             EXECUTE 'update counter_cache SET count = counter_cache.count - 1 where count > 0 and name = ''status_visibility_' || activity_visibility(OLD.actor, OLD.recipients, OLD.data) || ''';';
+          END IF;
+          RETURN NEW;
+      ELSIF TG_OP = 'DELETE' THEN
+          IF OLD.data->>'type' = 'Create' THEN
+            EXECUTE 'update counter_cache SET count = counter_cache.count - 1 where count > 0 and name = ''status_visibility_' || activity_visibility(OLD.actor, OLD.recipients, OLD.data) || ''';';
+          END IF;
+          RETURN OLD;
+      END IF;
+      END;
+    $$
+    LANGUAGE 'plpgsql';
+    """
+    |> execute()
+
+    """
+    CREATE TRIGGER status_visibility_counter_cache_trigger BEFORE INSERT OR UPDATE of recipients, data OR DELETE ON activities
+    FOR EACH ROW
+    EXECUTE PROCEDURE update_status_visibility_counter_cache();
+    """
+    |> execute()
+  end
+
+  def down do
+    execute("drop trigger if exists status_visibility_counter_cache_trigger on activities")
+    execute("drop function if exists update_status_visibility_counter_cache()")
+    drop_if_exists(unique_index(:counter_cache, [:name]))
+    drop_if_exists(table(:counter_cache))
+  end
+end