Merge pull request #7 from lorello/master

Added the possibility to include hostname in messages posted to Slack

README.md

@@ -19,6 +19,24 @@ curl -O https://raw.githubusercontent.com/int128/slack-docker/master/docker-comp
 docker-compose up -d
 ```
 
+### Include docker hostname in the messages
+
+If you run standalone docker hosts you'll probably find usefull include the `HOSTNAME` in the 
+messages posted to slack. Run the container as follows:
+
+```sh
+# Docker
+docker run --net=host --env include_hostname=1 -d -e webhook=URL -v /var/run/docker.sock:/var/run/docker.sock int128/slack-docker
+```
+
+or set the variable explicitly
+
+```sh
+# Docker
+docker run --env HOSTNAME=${HOSTNAME} --env include_hostname=1 -d -e webhook=URL -v /var/run/docker.sock:/var/run/docker.sock int128/slack-docker
+```
+
+
 ### 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:

app.js

@@ -3,7 +3,6 @@ const Docker = require('dockerode');
 const Slack = require('./slack');
 const JSONStream = require('JSONStream');
 const templates = require('./templates');
-
 const imageRegExp = new RegExp(process.env.image_regexp);
 const docker = new Docker();
 const slack = new Slack({
@@ -13,13 +12,17 @@ const slack = new Slack({
 
 async function sendEvent(event) {
   console.info(event);
+  hostname_string = '';
+  if (process.env.include_hostname) {
+    hostname_string = '@ ' + process.env.HOSTNAME
+  }
   if (imageRegExp.test(event.from)) {
     const template = templates[`${event.Type}_${event.Action}`];
     if (template) {
       const attachment = template(event);
       if (attachment) {
         await slack.send({
-          username: `docker ${event.Type} ${event.Actor.Attributes.name}`,
+          username: `docker ${event.Type} ${event.Actor.Attributes.name} ${hostname_string}`,
           attachments: [attachment],
         });
       }

docker-compose.yml

@@ -4,3 +4,4 @@ daemon:
     - /var/run/docker.sock:/var/run/docker.sock
   environment:
     - webhook=https://hooks.slack.com/services/...
+    #- include_hostname=1