add initial version of twitter plugin

plugins/inputs/twitter/README.md

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+# Telegraf Service Plugin: twitter
+
+Originally developed by https://dzone.com/articles/monitoring-cryptocurrency-with-influxdb-amp-telegr
+
+### Configuration:
+
+```toml
+# Pulls metrics from tweets
+[[inputs.twitter]]
+  ## These values can be optained from apps.twitter.com
+  consumer_key = "ZrJV7ouTEQPW1gvtFti0Ou2qb"
+  consumer_secret = "X9qKXO8AkgVWEuS0TPbrxykzDpCtr9FJogUm1YEUbky1aW6hsk"
+  access_token = "835781864833052672-sBie6YhrhUB4MAYtyYZSE1fDlNv2XGM"
+  access_token_secret = "GGnHT2M8s5tQ7e4iKHIoDPNAsVSKUMmh6dBGNaluat5Yf"
+  keywords_to_track = "bitcoin,$btc,ethereum,$eth,monero,$xmr,dax,$dax,eurusd"
+```
+
+### Measurements & Fields:
+
+
+### Tags:
+
+
+### Example Output:
+

plugins/inputs/twitter/twitter.go

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+package twitter
+
+import (
+	"context"
+	"net/url"
+	"strings"
+	"sync"
+
+	"github.com/ChimeraCoder/anaconda"
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/inputs"
+)
+
+type Twitter struct {
+	ServiceAddress    string
+	ConsumerKey       string
+	ConsumerSecret    string
+	AccessToken       string
+	AccessTokenSecret string
+	KeywordsToTrack   string
+
+	api    *anaconda.TwitterApi
+	wg     *sync.WaitGroup
+	ctx    context.Context
+	cancel context.CancelFunc
+}
+
+var sampleConfig = `
+  ## These values can be optained from apps.twitter.com
+  service_address = ""
+  consumer_key = ""
+  consumer_secret = ""
+  access_token = ""
+  access_token_secret = ""
+  keywords_to_track = ""
+`
+
+// SampleConfig returns the default configuration of the Input
+func (s *Twitter) SampleConfig() string {
+	return sampleConfig
+}
+
+// Description returns a one-sentence description on the Input
+func (s *Twitter) Description() string {
+	return "Pulls metrics from tweets"
+}
+
+// Gather - Called every interval and used for polling inputs
+func (s *Twitter) Gather(acc telegraf.Accumulator) error {
+	return nil
+}
+
+// Start - Called once when starting the plugin
+func (s *Twitter) Start(acc telegraf.Accumulator) error {
+	anaconda.SetConsumerKey(s.ConsumerKey)
+	anaconda.SetConsumerSecret(s.ConsumerSecret)
+	s.api = anaconda.NewTwitterApi(s.AccessToken, s.AccessTokenSecret)
+
+	// Store the cancel function so we can call it on Stop
+	s.ctx, s.cancel = context.WithCancel(context.Background())
+	s.wg = &sync.WaitGroup{}
+	s.wg.Add(1)
+	go s.fetchTweets(acc)
+
+	return nil
+}
+
+func (s *Twitter) fetchTweets(acc telegraf.Accumulator) {
+	defer s.wg.Done()
+	// We will use this little later for finding keywords in tweets
+	keywordsList := strings.Split(s.KeywordsToTrack, ",")
+	// Setting the keywords we want to track
+	v := url.Values{}
+	v.Set("track", s.KeywordsToTrack)
+	stream := s.api.PublicStreamFilter(v)
+	for item := range stream.C {
+		select {
+		// Listen for the call to cancle so we know it's time to stop
+		case <-s.ctx.Done():
+			stream.Stop()
+			return
+		default:
+			switch tweet := item.(type) {
+			case anaconda.Tweet:
+				fields := make(map[string]interface{})
+				tags := make(map[string]string)
+				if tweet.Lang != "" {
+					tags["lang"] = tweet.Lang
+				}
+				fields["retweet_count"] = tweet.RetweetCount
+				fields["tweet_id"] = tweet.IdStr
+				fields["followers_count"] = tweet.User.FollowersCount
+				fields["screen_name"] = tweet.User.ScreenName
+				fields["friends_count"] = tweet.User.FriendsCount
+				fields["user_verified"] = tweet.User.Verified
+				fields["source"] = tweet.Source
+				fields["full_text"] = tweet.FullText
+				time, err := tweet.CreatedAtTime()
+				if err != nil {
+					acc.AddError(err)
+					continue
+				}
+				for _, keyword := range keywordsList {
+					if strings.Contains(strings.ToLower(tweet.Text), strings.ToLower(keyword)) {
+						tags["keyword"] = strings.ToLower(keyword)
+						acc.AddFields("tweets", fields, tags, time)
+					}
+				}
+			}
+		}
+	}
+}
+
+// Stop - Called once when stopping the plugin
+func (s *Twitter) Stop() {
+	s.cancel()
+	s.wg.Wait()
+	return
+}
+
+func init() {
+	inputs.Add("twitter", func() telegraf.Input { return &Twitter{} })
+}