Add plugin development framework (#4324)

plugins/inputs/logparser/dev/docker-compose.yml

@@ -0,0 +1,13 @@
+version: '3'
+
+services:
+    telegraf:
+        image: glinton/scratch
+        volumes:
+          - ./telegraf.conf:/telegraf.conf
+          - ../../../../telegraf:/telegraf
+          - ./test.log:/var/log/test.log
+        entrypoint:
+          - /telegraf
+          - --config
+          - /telegraf.conf

plugins/inputs/logparser/dev/telegraf.conf

@@ -0,0 +1,12 @@
+[agent]
+  interval="1s"
+  flush_interval="1s"
+
+[[inputs.logparser]]
+   files = ["/var/log/test.log"]
+   from_beginning = true
+   [inputs.logparser.grok]
+      patterns = [ "%{COMBINED_LOG_FORMAT}", "%{CLIENT:client_ip} %{NOTSPACE:ident} %{NOTSPACE:auth} \\[%{TIMESTAMP_ISO8601:timestamp}\\] \"(?:%{WORD:verb:tag} %{NOTSPACE:request}(?: HTTP/%{NUMBER:http_version:float})?|%{DATA})\" %{NUMBER:resp_code:tag} (?:%{NUMBER:resp_bytes:int}|-) %{QS:referrer} %{QS:agent}"]
+
+[[outputs.file]]
+  files = ["stdout"]

plugins/inputs/logparser/dev/test.log

@@ -0,0 +1,2 @@
+127.0.0.1 ident auth [10/Oct/2000:13:55:36 -0700] "GET /anything HTTP/1.0" 200 2326 "http://localhost:8083/" "Chrome/51.0.2704.84"
+127.0.0.1 ident auth [2018-02-21 13:10:34,555] "GET /peter HTTP/1.0" 200 2326 "http://localhost:8083/" "Chrome/51.0.2704.84"