Post to multiple slack channels

Per a request from Donald Johnson, added support to ankh for
posting to multiple slack channels. Also added channels as an
array to the slack section in ankh config

README.md

@@ -263,6 +263,7 @@ When invoked, Ankh will operate over both the `haste-server` and `myservice` cha
 | format        | string | Optional. Format of slack message that will be used. See available variables below. |
 | rollbackFormat | string | Optional. Format of message for rollbacks that will be used. See available variables below. |
 | pretext       | string | Optional. Pretext for slack message. Default is `A new release notification has been received`. |
+| channels       | []string | Optional. Channel[s} to post the message to. |
 
 #### `JiraConfig`
 | Field         | Type     | Description                                                                                                          |

ankh/main.go

@@ -431,7 +431,8 @@ func execute(ctx *ankh.ExecutionContext) {
 		executeContext(ctx, &rootAnkhFile)
 	}
 
-	if len(ctx.SlackChannels) > 0 {
+	if len(ctx.AnkhConfig.Slack.Channels) > 0 {
+		ctx.Logger.Debugf("Pinging %d slack channels %+v", len(ctx.AnkhConfig.Slack.Channels), ctx.AnkhConfig.Slack.Channels)
 		if ctx.Mode == ankh.Rollback {
 			ctx.SlackDeploymentVersion = "rollback"
 		}
@@ -912,7 +913,9 @@ func main() {
 				ctx.LocalChart = true
 			}
 			ctx.Mode = ankh.Apply
-			ctx.SlackChannels = append(ctx.SlackChannels, *slackChannel)
+			if *slackChannel != "" {
+				ctx.AnkhConfig.Slack.Channels = []string{*slackChannel}
+			}
 			ctx.SlackMessageOverride = *slackMessageOverride
 			ctx.CreateJiraTicket = *createJiraTicket
 			filters := []string{}
@@ -946,7 +949,7 @@ func main() {
 				ctx.LocalChart = true
 			}
 			ctx.Mode = ankh.Rollback
-			ctx.SlackChannels = append(ctx.SlackChannels, *slackChannel)
+			ctx.AnkhConfig.Slack.Channels = append(ctx.AnkhConfig.Slack.Channels, *slackChannel)
 			ctx.SlackMessageOverride = *slackMessageOverride
 			ctx.CreateJiraTicket = *createJiraTicket
 			ctx.Filters = []string{"deployment", "statfulset"}

context/context.go

@@ -111,12 +111,13 @@ type DockerConfig struct {
 }
 
 type SlackConfig struct {
-	Token          string `yaml:"token"`
-	Icon           string `yaml:"icon-url"`
-	Username       string `yaml:"username"`
-	Format         string `yaml:"format"`
-	RollbackFormat string `yaml:"rollbackFormat"`
-	Pretext        string `yaml:"pretext"`
+	Token          string   `yaml:"token"`
+	Icon           string   `yaml:"icon-url"`
+	Username       string   `yaml:"username"`
+	Format         string   `yaml:"format"`
+	RollbackFormat string   `yaml:"rollbackFormat"`
+	Pretext        string   `yaml:"pretext"`
+	Channels       []string `yaml:"channels"`
 }
 
 type JiraConfig struct {

slack/slack.go

@@ -52,22 +52,22 @@ func PingSlackChannel(ctx *ankh.ExecutionContext) error {
 		Username: username,
 	}
 
-        channels := make(map[string]string, len(ctx.SlackChannels))
-	for _, ch := range ctx.SlackChannels {
+	channels := make(map[string]string, len(ctx.AnkhConfig.Slack.Channels))
+	for _, ch := range ctx.AnkhConfig.Slack.Channels {
 		channelId, err := getSlackChannelIDByName(api, ch)
-	        if err != nil {
-		        return err
-	        }
-                channels[ch] = channelId
-        }
+		if err != nil {
+			return err
+		}
+		channels[ch] = channelId
+	}
 
 	for name, id := range channels {
-	        if !ctx.DryRun {
-		        _, _, err = api.PostMessage(id, slack.MsgOptionAttachments(attachment), slack.MsgOptionPostMessageParameters(messageParams))
-	        } else {
-		        ctx.Logger.Infof("--dry-run set so not sending message '%v' to slack channel %v", messageText, name)
-	        }
-        }
+		if !ctx.DryRun {
+			_, _, err = api.PostMessage(id, slack.MsgOptionAttachments(attachment), slack.MsgOptionPostMessageParameters(messageParams))
+		} else {
+			ctx.Logger.Infof("--dry-run set so not sending message '%v' to slack channel %v", messageText, name)
+		}
+	}
 
 	return err
 }