From 020f9cdc5d88284478036e28d1603784fc944ce1 Mon Sep 17 00:00:00 2001
From: Teemu Patja <tp@iki.fi>
Date: Fri, 17 Mar 2017 21:35:06 +0200
Subject: [PATCH] Gather usage metrics to db table with sql trigger

---
 .../20170317210604-user-stats.down.sql        |  0
 .../20170317210604-user-stats.up.sql          | 23 +++++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 resources/migrations/20170317210604-user-stats.down.sql
 create mode 100644 resources/migrations/20170317210604-user-stats.up.sql

diff --git a/resources/migrations/20170317210604-user-stats.down.sql b/resources/migrations/20170317210604-user-stats.down.sql
new file mode 100644
index 0000000..e69de29
diff --git a/resources/migrations/20170317210604-user-stats.up.sql b/resources/migrations/20170317210604-user-stats.up.sql
new file mode 100644
index 0000000..8c03bc7
--- /dev/null
+++ b/resources/migrations/20170317210604-user-stats.up.sql
@@ -0,0 +1,23 @@
+
+drop table usage_metrics;
+CREATE TABLE usage_metrics (
+    registered_users int,
+    users_with_address int,
+    change_timestamp timestamp without time zone
+ DEFAULT timezone('utc'::text, now()));
+
+
+CREATE OR REPLACE FUNCTION store_usage_metrics() RETURNS TRIGGER AS $usage_metrics$
+BEGIN
+  insert into usage_metrics (registered_users, users_with_address)
+  values ((select count(*) from users),
+          (select count(*) from users
+          where address is not null));
+
+  return null;
+END;
+$usage_metrics$ LANGUAGE plpgsql;
+
+CREATE TRIGGER usage_metrics
+AFTER INSERT OR UPDATE OR DELETE ON users
+execute PROCEDURE store_usage_metrics();