From 4398de084a44bc3508bab9c07d9587ff85bd38d5 Mon Sep 17 00:00:00 2001
From: int128 <int128@gmail.com>
Date: Tue, 15 Dec 2015 01:13:08 +0900
Subject: [PATCH] Feature #2: filter events by image name

---
 README.md  | 8 ++++++++
 app.coffee | 9 +++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index e37cdd4..f25ed15 100644
--- a/README.md
+++ b/README.md
@@ -19,6 +19,14 @@ curl -O https://raw.githubusercontent.com/int128/slack-docker/master/docker-comp
 docker-compose up -d
 ```
 
+### Filter events by image name
+
+By default all events are sent to Slack, but events can be filtered by the environment variable `image_regexp` as follows:
+
+```sh
+docker run -d -e image_regexp='node:.*' -e webhook=URL -v /var/run/docker.sock:/var/run/docker.sock int128/slack-docker
+```
+
 
 ## Contribution
 
diff --git a/app.coffee b/app.coffee
index 53a04d3..36f7976 100644
--- a/app.coffee
+++ b/app.coffee
@@ -26,6 +26,11 @@ Slack =
       fields: fields
     .fail (e) -> console.error e
 
+EventFilter =
+  _imageRegExp: new RegExp(process.env.image_regexp)
+  satisfy: (event) ->
+    @_imageRegExp.test event.from
+
 EventProcessor =
   _containers: {}
   _start: (event) ->
@@ -55,8 +60,8 @@ Docker.getVersion().then (version) ->
   console.info version
   Docker.events().then (stream) ->
     stream.pipe EventStream.map (event) ->
-      console.info "#{event.time}: #{event.status}: #{event.id} from #{event.from}"
-      EventProcessor.handle event
+      if EventFilter.satisfy event
+        EventProcessor.handle event
 .fail (e) ->
   console.error e