add slackrus slack notifications

README.md

@@ -189,6 +189,9 @@ Watchtower can send notifications when containers are updated. Notifications are
 The types of notifications to send are passed via the comma-separated option `--notifications` (or corresponding environment variable `WATCHTOWER_NOTIFICATIONS`), which has the following valid values:
 
 * `email` to send notifications via e-mail
+* `slack` to send notifications through a Slack webhook
+
+### Notifications via E-Mail
 
 To receive notifications by email, the following command-line options, or their corresponding environment variables, can be set:
 
@@ -215,3 +218,22 @@ docker run -d \
   v2tec/watchtower
 ```
 
+### Notifications through Slack webhook
+
+To receive notifications in Slack, add `slack` to the `--notifications` option or the `WATCHTOWER_NOTIFICATIONS` environment variable.
+
+Additionally, you should set the Slack webhook url using the `--notification-slack-hook-url` option or the `WATCHTOWER_NOTIFICATION_SLACK_HOOK_URL` environment variable.
+
+By default, watchtower will send messages under the name `watchtower`, you can customize this string through the `--notification-slack-identifier` option or the `WATCHTOWER_NOTIFICATION_SLACK_IDENTIFIER` environment variable.
+
+Example:
+
+```bash
+docker run -d \
+  --name watchtower \
+  -v /var/run/docker.sock:/var/run/docker.sock \
+  -e WATCHTOWER_NOTIFICATIONS=slack \
+  -e WATCHTOWER_NOTIFICATION_SLACK_HOOK_URL="https://hooks.slack.com/services/xxx/yyyyyyyyyyyyyyy" \
+  -e WATCHTOWER_NOTIFICATION_SLACK_IDENTIFIER=watchtower-server-1 \
+  v2tec/watchtower
+```

glide.lock

@@ -1,5 +1,5 @@
-hash: 9ddd729b207d71ce16ae9a0282ac87a046b9161ac4f15b108e86a03367172516
-updated: 2017-01-24T20:45:43.1914053+01:00
+hash: c0e0c69383b9b665e92c40a5ea69632ea846a645f44654411137c75c5ef5017c
+updated: 2017-11-27T11:34:21.283697431+01:00
 imports:
 - name: github.com/Azure/go-ansiterm
   version: 388960b655244e76e24c75f48631564eaefade62
@@ -25,7 +25,7 @@ imports:
   - registry/storage/cache/memory
   - uuid
 - name: github.com/docker/docker
-  version: 49bf474f9ed7ce7143a59d1964ff7b7fd9b52178
+  version: 092cba3727bb9b4a2f0e922cd6c0f93ea270e363
   subpackages:
   - api
   - api/server/httputils
@@ -110,13 +110,16 @@ imports:
   version: 0eeaf8392f5b04950925b8a69fe70f110fa7cbfc
 - name: github.com/inconshreveable/mousetrap
   version: 76626ae9c91c4f2a10f34cad8ce83ea42c93bb75
+- name: github.com/johntdyer/slack-go
+  version: 88ef3038545fa084d81f36e4a6943d112cdd74f6
+- name: github.com/johntdyer/slackrus
+  version: 3992f319fd0ac349483279ef74742cd787841cba
 - name: github.com/mattn/go-shellwords
   version: f4e566c536cf69158e808ec28ef4182a37fdc981
 - name: github.com/Microsoft/go-winio
   version: 24a3e3d3fc7451805e09d11e11e95d9a0a4f205e
 - name: github.com/opencontainers/runc
-  version: 2f7393a47307a16f8cee44a37b262e8b81021e3e
-  repo: https://github.com/docker/runc.git
+  version: e8149af2910850602cae998dede29e630d1b8ee1
   subpackages:
   - libcontainer/configs
   - libcontainer/devices
@@ -135,10 +138,11 @@ imports:
 - name: github.com/robfig/cron
   version: 9585fd555638e77bba25f25db5c44b41f264aeb7
 - name: github.com/Sirupsen/logrus
-  version: d26492970760ca5d33129d2d799e34be5c4782eb
+  version: ba1b36c82c5e05c4f912a88eab0dcd91a171688f
+- name: github.com/sirupsen/logrus
+  version: ba1b36c82c5e05c4f912a88eab0dcd91a171688f
 - name: github.com/spf13/cobra
-  version: a3c09249f1a24a9d951f2738fb9b9256b8b42fa5
-  repo: https://github.com/dnephin/cobra.git
+  version: 1be1d2841c773c01bee8289f55f7463b6e2c2539
 - name: github.com/spf13/pflag
   version: dabebe21bf790f782ea4c7bbd2efc430de182afd
 - name: github.com/stretchr/objx

glide.yaml

@@ -26,3 +26,5 @@ import:
   - context
 - package: github.com/robfig/cron
   version: 9585fd555638e77bba25f25db5c44b41f264aeb7
+- package: github.com/johntdyer/slackrus
+  version: 3992f31

main.go

@@ -8,8 +8,8 @@ import (
 
 	"strconv"
 
-	log "github.com/sirupsen/logrus"
 	"github.com/robfig/cron"
+	log "github.com/sirupsen/logrus"
 	"github.com/urfave/cli"
 	"github.com/v2tec/watchtower/actions"
 	"github.com/v2tec/watchtower/container"
@@ -93,7 +93,7 @@ func main() {
 		cli.StringSliceFlag{
 			Name:   "notifications",
 			Value:  &cli.StringSlice{},
-			Usage:  "notification types to send (valid: email)",
+			Usage:  "notification types to send (valid: email, slack)",
 			EnvVar: "WATCHTOWER_NOTIFICATIONS",
 		},
 		cli.StringFlag{
@@ -136,6 +136,23 @@ func main() {
 			Usage:  "SMTP server password for sending notifications",
 			EnvVar: "WATCHTOWER_NOTIFICATION_EMAIL_SERVER_PASSWORD",
 		},
+		cli.StringFlag{
+			Name:   "notification-slack-hook-url",
+			Usage:  "The Slack Hook URL to send notifications to",
+			EnvVar: "WATCHTOWER_NOTIFICATION_SLACK_HOOK_URL",
+		},
+		cli.StringFlag{
+			Name:   "notification-slack-identifier",
+			Usage:  "A string which will be used to identify the messages coming from this watchtower instance. Default if omitted is \"watchtower\"",
+			EnvVar: "WATCHTOWER_NOTIFICATION_SLACK_IDENTIFIER",
+			Value:  "watchtower",
+		},
+		cli.StringFlag{
+			Name:   "notification-slack-level",
+			Usage:  "The log level used for sending notifications through Slack. Default if omitted is \"info\". Possible values: \"panic\",\"fatal\",\"error\",\"warn\",\"info\" or \"debug\"",
+			EnvVar: "WATCHTOWER_NOTIFICATION_SLACK_LEVEL",
+			Value:  "info",
+		},
 	}
 
 	if err := app.Run(os.Args); err != nil {

notifications/notifier.go

@@ -26,6 +26,8 @@ func NewNotifier(c *cli.Context) *Notifier {
 		switch t {
 		case emailType:
 			tn = newEmailNotifier(c)
+		case slackType:
+			tn = newSlackNotifier(c)
 		default:
 			log.Fatalf("Unknown notification type %q", t)
 		}

notifications/slack.go

@@ -0,0 +1,38 @@
+package notifications
+
+import (
+	"github.com/johntdyer/slackrus"
+	log "github.com/sirupsen/logrus"
+	"github.com/urfave/cli"
+)
+
+const (
+	slackType = "slack"
+)
+
+type slackTypeNotifier struct {
+	slackrus.SlackrusHook
+}
+
+func newSlackNotifier(c *cli.Context) typeNotifier {
+	logLevel, err := log.ParseLevel(c.GlobalString("notification-slack-level"))
+	if err != nil {
+		log.Fatalf("Slack notifications: %s", err.Error())
+	}
+
+	n := &slackTypeNotifier{
+		SlackrusHook: slackrus.SlackrusHook{
+			HookURL:        c.GlobalString("notification-slack-hook-url"),
+			Username:       c.GlobalString("notification-slack-identifier"),
+			AcceptedLevels: slackrus.LevelThreshold(logLevel),
+		},
+	}
+
+	log.AddHook(n)
+
+	return n
+}
+
+func (s *slackTypeNotifier) StartNotification() {}
+
+func (s *slackTypeNotifier) SendNotification() {}