Add status subcommand

 - This check uses the public Health RSS Feeds to provide information about
   a particular service

README.md

@@ -1,9 +1,34 @@
 # check_cloud_aws
 
-Icinga check plugin to check Amazon AWS resources. At the moment the check only supports EC2 instances.
+An Icinga check plugin to check Amazon AWS resources.
 
 ## Usage
 
+### Health Status
+
+A general status based on the RSS feed on the AWS Health Page
+
+```
+Usage:
+  check_cloud_aws status [flags]
+
+Flags:
+  -u, --url string       The AWS Status Page URL (default "https://status.aws.amazon.com")
+  -s, --service string   The AWS Service to check (default "ec2")
+  -h, --help             help for status
+```
+
+```
+check_cloud_aws status --service cloudfront
+OK - Service cloudfront is operating normally
+
+check_cloud_aws --region us-west-1 status --service cloudwatch
+WARNING - Information available for cloudwatch in us-west-1
+
+check_cloud_aws --region eu-west-1 status
+CRITICAL - Service disruption for ec2 in eu-west-1
+```
+
 ### EC2 - Instances
 
 When one of the states is non-ok, or a machine is stopped, the check will alert.

cmd/status.go

@@ -0,0 +1,180 @@
+package cmd
+
+import (
+	"encoding/xml"
+	"fmt"
+	"github.com/NETWAYS/check_cloud_aws/internal/status"
+	"github.com/NETWAYS/go-check"
+	"github.com/spf13/cobra"
+	"net/http"
+	"net/url"
+	"strings"
+)
+
+// To store the CLI parameters
+type StatusConfig struct {
+	Url     string
+	Service string
+}
+
+var cliStatusConfig StatusConfig
+
+func contains(s string, list []string) bool {
+	// Tiny helper to see if a string is in a list of strings
+	for _, elem := range list {
+		if s == elem {
+			return true
+		}
+	}
+
+	return false
+}
+
+var statusCmd = &cobra.Command{
+	Use:   "status",
+	Short: "Checks the status of AWS services",
+	Example: `
+	check_cloud_aws status --service cloudfront
+	OK - Service cloudfront is operating normally
+
+	check_cloud_aws --region us-west-1 status --service cloudwatch
+	WARNING - Information available for cloudwatch in us-west-1
+
+	check_cloud_aws --region eu-west-1 status
+	CRITICAL - Service disruption for ec2 in eu-west-1`,
+	Run: func(cmd *cobra.Command, args []string) {
+		var (
+			feed    status.Rss
+			rc      int
+			output  string
+			feedUrl string
+		)
+
+		// These services don't require a region
+		// Hint: This list might not be extensive
+		var globalServices = []string{"route53",
+			"route53domainregistration",
+			"route53apprecoverycontroller",
+			"chime",
+			"health",
+			"import-export",
+			"iam",
+			"awsiotdevicemanagement",
+			"marketplace",
+			"apipricing",
+			"awswaf",
+			"trustedadvisor",
+			"supportcenter",
+			"resourcegroups",
+			"organizations",
+			"management-console",
+			"awsiotdevicemanagement",
+			"account",
+			"interregionvpcpeering",
+			"cloudfront",
+			"billingconsole",
+			"chatbot"}
+
+		// Creating an client and connecting to the RSS Feed
+		// Access the AWS Health Dashboard at health.aws.amazon.com directly,
+		// since the AWS Go SDK just supports Personal Dashboards
+		c := &http.Client{}
+
+		if Region == "" && !contains(cliStatusConfig.Service, globalServices) {
+			check.ExitError(fmt.Errorf("Region required for regional services"))
+		}
+
+		// Using + concatenation since the JoinPath will add / inbetween
+		if Region == "" && contains(cliStatusConfig.Service, globalServices) {
+			feedUrl, _ = url.JoinPath(cliStatusConfig.Url, "/rss/", cliStatusConfig.Service+".rss")
+			// Just for the output later
+			Region = "Global"
+		} else {
+			feedUrl, _ = url.JoinPath(cliStatusConfig.Url, "/rss/", cliStatusConfig.Service+"-"+Region+".rss")
+		}
+
+		resp, err := c.Get(feedUrl)
+
+		if err != nil {
+			check.ExitError(err)
+		}
+
+		if resp.StatusCode != http.StatusOK {
+			check.ExitError(fmt.Errorf("Could not get %s - Error: %d", feedUrl, resp.StatusCode))
+		}
+
+		defer resp.Body.Close()
+		err = xml.NewDecoder(resp.Body).Decode(&feed)
+
+		if err != nil {
+			check.ExitError(err)
+		}
+
+		// Exit if there are no events
+		if len(feed.Channel.Items) == 0 {
+			rc = check.OK
+			output = fmt.Sprintf("No events for %s (%s)", cliStatusConfig.Service, Region)
+			check.ExitRaw(rc, output)
+		}
+
+		rc = check.Unknown
+		output = "Status unknown"
+
+		// Get the latest event
+		item := strings.Split(feed.Channel.Items[0].Title, ":")
+
+		// If we couldn't split the title
+		if len(item) < 2 {
+			output = "Could not determine status."
+			check.ExitRaw(rc, output, feed.Channel.Items[0].Title)
+		}
+
+		event := item[0]
+		details := item[1]
+
+		if strings.Contains(event, "Service disruption") {
+			// Service disruptions are Critical
+			rc = check.Critical
+			output = fmt.Sprintf("Service disruption for %s (%s)", cliStatusConfig.Service, Region)
+		}
+
+		if strings.Contains(event, "Performance issue") {
+			// Performance issues are Warnings
+			rc = check.Warning
+			output = fmt.Sprintf("Performance issues for %s (%s)", cliStatusConfig.Service, Region)
+		}
+
+		if strings.Contains(event, "Informational message") {
+			// There will be no new item if an information is resolved,
+			// we need to check if the info is resolved.
+			if strings.Contains(details, "[RESOLVED]") {
+				rc = check.OK
+				output = fmt.Sprintf("Event resolved for %s (%s)", cliStatusConfig.Service, Region)
+			} else {
+				// An information that should be checked by someone
+				rc = check.Warning
+				output = fmt.Sprintf("Information available for %s (%s)", cliStatusConfig.Service, Region)
+			}
+		}
+
+		if strings.Contains(event, "Service is operating normally") {
+			rc = check.OK
+			output = fmt.Sprintf("Service %s is operating normally (%s)", cliStatusConfig.Service, Region)
+		}
+
+		check.ExitRaw(rc, output)
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(statusCmd)
+
+	fs := statusCmd.Flags()
+
+	fs.StringVarP(&cliStatusConfig.Url, "url", "u", "https://status.aws.amazon.com",
+		"The AWS Status Page URL")
+	fs.StringVarP(&cliStatusConfig.Service, "service", "s", "ec2",
+		"The AWS Service to check")
+
+	fs.SortFlags = false
+}