From 85f365c0cacb4ad9368bfb18b968ec5c545d85a3 Mon Sep 17 00:00:00 2001 From: Sam Willcocks Date: Thu, 2 Jan 2020 18:05:42 +0000 Subject: [PATCH] Initial commit, it works --- go.mod | 8 ++++++ go.sum | 79 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ main.go | 68 +++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 155 insertions(+) create mode 100644 go.mod create mode 100644 go.sum create mode 100644 main.go diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..f92f471 --- /dev/null +++ b/go.mod @@ -0,0 +1,8 @@ +module code.int.wlcx.cc/twitter-prometheus + +go 1.13 + +require ( + github.com/prometheus/client_golang v1.3.0 + github.com/sirupsen/logrus v1.4.2 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..154a29b --- /dev/null +++ b/go.sum @@ -0,0 +1,79 @@ +github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= +github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc= +github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= +github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0= +github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q= +github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8= +github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM= +github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw= +github.com/cespare/xxhash/v2 v2.1.1 h1:6MnRN8NT7+YBpUIWxHtefFZOKTAPgGjpQSxqLNn0+qY= +github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew 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"net/http" + "net/url" + "time" + + "github.com/prometheus/client_golang/prometheus" + "github.com/prometheus/client_golang/prometheus/promhttp" + log "github.com/sirupsen/logrus" +) + +func probeTwitter(ctx context.Context, target string, registry *prometheus.Registry) (success bool) { + followersGauge := prometheus.NewGaugeVec(prometheus.GaugeOpts{ + Name: "twitter_followers", + Help: "The number of followers of the twitter account.", + }, + []string{"screen_name"}) + + registry.MustRegister(followersGauge) + + res, err := http.Get(fmt.Sprintf("https://cdn.syndication.twimg.com/widgets/followbutton/info.json?screen_names=%s", url.QueryEscape(target))) + if err != nil { + log.Errorf("fetching url: %s", err) + return false + } + + data := []struct { + FollowersCount int `json:"followers_count"` + }{} + if err := json.NewDecoder(res.Body).Decode(&data); err != nil { + log.Errorf("decoding json: %s", err) + return false + } + followersGauge.With(prometheus.Labels{"screen_name": target}).Set(float64(data[0].FollowersCount)) + return true +} + +func twitterHandler(w http.ResponseWriter, r *http.Request) { + username := r.URL.Query().Get("username") + if username == "" { + http.Error(w, "username parameter is missing", http.StatusBadRequest) + return + } + + reg := prometheus.NewRegistry() + + ctx, cancel := context.WithTimeout(r.Context(), time.Duration(5*time.Second)) + defer cancel() + + if success := probeTwitter(ctx, username, reg); !success { + log.Error("Probe failed!") + } + + h := promhttp.HandlerFor(reg, promhttp.HandlerOpts{}) + h.ServeHTTP(w, r) + +} +func main() { + http.Handle("/metrics", promhttp.Handler()) + http.HandleFunc("/probe", func(w http.ResponseWriter, r *http.Request) { + twitterHandler(w, r) + }) + http.ListenAndServe(":9700", nil) +}