return an error message with helpful debug when config !correct?

added sample event and config

Signed-off-by: Ben Abrams <[email protected]>

CHANGELOG.md

@@ -5,6 +5,12 @@ This CHANGELOG follows the format listed [here](https://github.com/sensu-plugins
 
 ## [Unreleased]
 
+### Changed
+- `handler-slack.rb`: emit an `unknown` with helpful debug messages when passing in bad config (@majormoses)
+
+### Added
+- added sample event payload and config (@majormoses)
+
 ## [3.0.0] - 2018-01-11
 ### Breaking Changes
 - bumped `sensu-plugin` dependency to 2.x which removes in handler filtering for `occurrences`. If you want to keep using the same filtering features you must specify it and ensure that you have applied the filter by setting `"filters": ["occurrences"]`. For more information see [here](https://blog.sensuapp.org/deprecating-event-filtering-in-sensu-plugin-b60c7c500be3) (@majormoses)

bin/handler-slack.rb

@@ -96,6 +96,15 @@ def incident_key
 
   def get_setting(name)
     settings[config[:json_config]][name]
+  rescue TypeError, NoMethodError => e
+    puts "settings: #{settings}"
+    puts "slack key: #{config[:json_config]}. This should not be a file name/path."
+    puts <<-EOS
+      key name: #{name}. This is the key in config that broke.
+      Check the slack key to make sure it's parent key exists"
+      EOS
+    puts "error: #{e.message}"
+    exit 3 # unknown
   end
 
   def handle

sample/handler_slack_config.json

@@ -0,0 +1,10 @@
+{
+  "slack": {
+    "webhook_url": "https://hooks.slack.com/services/XXX/XXX/XXX",
+    "dashboard": "https://my-super-awesome-dashbord.domain.tld",
+    "channel": "#bots",
+    "bot_name": "sensubot",
+    "icon_url": "https://raw.githubusercontent.com/sensu/sensu-logo/master/sensu1_flat%20white%20bg_png.png",
+    "icon_emoji": ":snowman:"
+  }
+}

sample/handler_slack_event.json

@@ -0,0 +1,34 @@
+  {
+    "id": "ef6b87d2-1f89-439f-8bea-33881436ab90",
+    "action": "create",
+    "timestamp": 1460172826,
+    "occurrences": 2,
+    "check": {
+      "type": "standard",
+      "total_state_change": 11,
+      "history": ["0", "0", "1", "1", "2", "2"],
+      "status": 2,
+      "output": "No keepalive sent from client for 230 seconds (>=180)",
+      "executed": 1460172826,
+      "issued": 1460172826,
+      "name": "keepalive",
+      "thresholds": {
+        "critical": 180,
+        "warning": 120
+      }
+    },
+    "client": {
+      "timestamp": 1460172596,
+      "version": "0.27.0",
+      "socket": {
+        "port": 3030,
+        "bind": "127.0.0.1"
+      },
+      "subscriptions": [
+        "base"
+      ],
+      "environment": "development",
+      "address": "127.0.0.1",
+      "name": "slackbot"
+    }
+  }