added test for nginx

mackerel-plugin-nginx/rule.txt

@@ -0,0 +1,7 @@
+nginx.connections.connections	>=0
+nginx.requests.accepts	>=0
+nginx.requests.handled	>=0
+nginx.requests.requests	>=0
+nginx.queue.reading	>=0
+nginx.queue.writing	>=0
+nginx.queue.waiting	>=0

mackerel-plugin-nginx/test.sh

@@ -0,0 +1,35 @@
+#!/bin/sh
+
+prog=$(basename "$0")
+if ! [ -S /var/run/docker.sock ]
+then
+	echo "$prog: there are no running docker" >&2
+	exit 2
+fi
+
+cd "$(dirname "$0")" || exit
+PATH=$(pwd):$PATH
+plugin=$(basename "$(pwd)")
+if ! which "$plugin" >/dev/null
+then
+	echo "$prog: $plugin is not installed" >&2
+	exit 2
+fi
+
+image=nginx:1.23
+port=20080
+
+docker run --name "test-$plugin" -p $port:80 -v $(pwd)/testdata/nginx.conf:/etc/nginx/nginx.conf:ro -d $image
+trap 'docker stop test-$plugin; docker rm test-$plugin; exit 1' 1 2 3 15
+sleep 10
+
+# to store previous value to calculate a diff of metrics
+$plugin -port $port >/dev/null 2>&1
+sleep 3
+
+$plugin -port $port | graphite-metric-test -f rule.txt
+status=$?
+
+docker stop "test-$plugin"
+docker rm "test-$plugin"
+exit $status

mackerel-plugin-nginx/testdata/nginx.conf

@@ -0,0 +1,44 @@
+
+user  nginx;
+worker_processes  auto;
+
+error_log  /var/log/nginx/error.log notice;
+pid        /var/run/nginx.pid;
+
+
+events {
+    worker_connections  1024;
+}
+
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
+                      '$status $body_bytes_sent "$http_referer" '
+                      '"$http_user_agent" "$http_x_forwarded_for"';
+
+    access_log  /var/log/nginx/access.log  main;
+
+    sendfile        on;
+    #tcp_nopush     on;
+
+    keepalive_timeout  65;
+
+    #gzip  on;
+
+    server {
+        listen       80;
+        server_name  localhost;
+
+        location / {
+            root   /usr/share/nginx/html;
+            index  index.html index.htm;
+        }
+
+        location = /nginx_status {
+            stub_status;
+        }
+    }
+}