From 1b14ff117d278cd2149eb6f39d68e545efb54033 Mon Sep 17 00:00:00 2001
From: Grant Slater <git@firefishy.com>
Date: Sun, 5 Apr 2020 14:39:53 +0100
Subject: [PATCH] tilecache: add script for reporting fastest peers

---
 cookbooks/tilecache/recipes/default.rb           |  7 +++++++
 .../templates/tilecache-fastest-peers.erb        | 16 ++++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 cookbooks/tilecache/templates/tilecache-fastest-peers.erb

diff --git a/cookbooks/tilecache/recipes/default.rb b/cookbooks/tilecache/recipes/default.rb
index 683a53d09..e6e848ce1 100644
--- a/cookbooks/tilecache/recipes/default.rb
+++ b/cookbooks/tilecache/recipes/default.rb
@@ -205,3 +205,10 @@ template "/srv/tilecache/tilecache-curl-time" do
   mode 0o755
   variables :caches => tilecaches, :renders => tilerenders
 end
+
+template "/srv/tilecache/tilecache-fastest-peers" do
+  source "tilecache-fastest-peers.erb"
+  owner "root"
+  group "root"
+  mode 0o755
+end
diff --git a/cookbooks/tilecache/templates/tilecache-fastest-peers.erb b/cookbooks/tilecache/templates/tilecache-fastest-peers.erb
new file mode 100644
index 000000000..c6745de3a
--- /dev/null
+++ b/cookbooks/tilecache/templates/tilecache-fastest-peers.erb
@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# Find performance reports for last few minutes
+# Add up total time taken to download tile grouped by remote server
+# Remove 1 second per successful time report (de-prioritise new servers)
+# Add 30 seconds per failed time report request
+# Sort time reports
+# Strip to best 4 server names
+
+/usr/bin/find /srv/tilecache/data/ -type f -iname 'tilecache-*.txt' -mmin -10 -print0 \
+ | /usr/bin/xargs -0 --no-run-if-empty /usr/bin/tail --quiet -n 20 \
+ | /usr/bin/awk -F ',' '$2 == 200 {time[$3] += $1; time[$3] -= 1} $2 != 200 {time[$3] +=30} END{for (i in time) print time[i], i}' \
+ | /usr/bin/sort -k1n \
+ | /usr/bin/cut -d '/' -f 3 \
+ | /bin/grep -E '(openstreetmap|localhost)' \
+ | /usr/bin/head -n 4
-- 
2.39.5