add initial version of rss plugin

plugins/inputs/rss/README.md

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+# Telegraf Input Plugin: rss
+
+### Configuration:
+
+```toml
+# Pulls items from rss feeds
+[[inputs.rss]]
+  ## One or more URLs from which to read rss feed
+  urls = [
+    "http://localhost/rss/feed"
+  ]
+
+  ## Reduce traffic. Do not run too frequently.
+  interval = '10m'
+```
+
+### Measurements & Fields:
+
+
+### Tags:
+
+
+### Example Output:
+

plugins/inputs/rss/rss.go

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+package rss
+
+import (
+	"fmt"
+	"sync"
+	"time"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/inputs"
+	"github.com/mmcdole/gofeed"
+)
+
+var ts = time.Now()
+
+type RSS struct {
+	URLs []string `toml:"urls"`
+}
+
+func (r *RSS) Description() string {
+	return "Reads RSS Feeds Description"
+}
+
+var sampleConfig = `
+  ## One or more URLs from which to read rss feed
+  urls = [
+    "http://localhost/rss/feed"
+  ]
+
+  ## Reduce traffic. Do not run too frequently.
+  interval = '10m'
+`
+
+func (r *RSS) SampleConfig() string {
+	return sampleConfig
+}
+
+func (r *RSS) Gather(acc telegraf.Accumulator) error {
+	var wg sync.WaitGroup
+	for _, u := range r.URLs {
+		wg.Add(1)
+		go func(url string) {
+			defer wg.Done()
+			if err := r.gatherFeed(acc, url, ts); err != nil {
+				acc.AddError(fmt.Errorf("[url=%s]: %s", url, err))
+			}
+		}(u)
+	}
+
+	// remember last time started
+	ts = time.Now()
+
+	wg.Wait()
+
+	return nil
+}
+
+func (r *RSS) gatherFeed(acc telegraf.Accumulator, url string, ts time.Time) error {
+	fp := gofeed.NewParser()
+	feed, err := fp.ParseURL(url)
+	if err != nil {
+		return err
+	}
+
+	fields := make(map[string]interface{})
+	tags := make(map[string]string)
+
+	tags["url"] = url
+	tags["feed_type"] = feed.FeedType
+	tags["feed_version"] = feed.FeedVersion
+
+	for _, item := range feed.Items {
+		time := item.PublishedParsed
+		if time.Before(ts) {
+			continue
+		}
+
+		fields["title"] = item.Title
+		fields["description"] = item.Description
+
+		acc.AddFields("rss", fields, tags, *time)
+	}
+
+	return nil
+}
+
+func init() {
+	inputs.Add("rss", func() telegraf.Input { return &RSS{} })
+}