Add input plugin for rollbar service. (#1247)

* Report rollbar events.

Signed-off-by: Cyril Duez <cyril@stormz.me>
Signed-off-by: François de Metz <francois@stormz.me>

* Fix indent with go fmt.

* Add test for rollbar webhooks.

* Report more data from new_item event.

* Handle new deploy webhook.

Signed-off-by: Cyril Duez <cyril@stormz.me>
Signed-off-by: François de Metz <francois@stormz.me>

* Update default port.

* Add readme.

* Add rollbar_webhooks to the readme.

* Add rollbar_webhooks to plugins list.

* Add tag level for new_item event.

* Update readme.

* Update changelog.

plugins/inputs/rollbar_webhooks/rollbar_webhooks_test.go

@@ -0,0 +1,74 @@
+package rollbar_webhooks
+
+import (
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/influxdata/telegraf/testutil"
+)
+
+func postWebhooks(rb *RollbarWebhooks, eventBody string) *httptest.ResponseRecorder {
+	req, _ := http.NewRequest("POST", "/", strings.NewReader(eventBody))
+	w := httptest.NewRecorder()
+	w.Code = 500
+
+	rb.eventHandler(w, req)
+
+	return w
+}
+
+func TestNewItem(t *testing.T) {
+	var acc testutil.Accumulator
+	rb := NewRollbarWebhooks()
+	resp := postWebhooks(rb, NewItemJSON())
+	if resp.Code != http.StatusOK {
+		t.Errorf("POST new_item returned HTTP status code %v.\nExpected %v", resp.Code, http.StatusOK)
+	}
+	rb.Gather(&acc)
+
+	fields := map[string]interface{}{
+		"id": 272716944,
+	}
+
+	tags := map[string]string{
+		"event":       "new_item",
+		"environment": "production",
+		"project_id":  "90",
+		"language":    "python",
+		"level":       "error",
+	}
+
+	acc.AssertContainsTaggedFields(t, "rollbar_webhooks", fields, tags)
+}
+
+func TestDeploy(t *testing.T) {
+	var acc testutil.Accumulator
+	rb := NewRollbarWebhooks()
+	resp := postWebhooks(rb, DeployJSON())
+	if resp.Code != http.StatusOK {
+		t.Errorf("POST deploy returned HTTP status code %v.\nExpected %v", resp.Code, http.StatusOK)
+	}
+	rb.Gather(&acc)
+
+	fields := map[string]interface{}{
+		"id": 187585,
+	}
+
+	tags := map[string]string{
+		"event":       "deploy",
+		"environment": "production",
+		"project_id":  "90",
+	}
+
+	acc.AssertContainsTaggedFields(t, "rollbar_webhooks", fields, tags)
+}
+
+func TestUnknowItem(t *testing.T) {
+	rb := NewRollbarWebhooks()
+	resp := postWebhooks(rb, UnknowJSON())
+	if resp.Code != http.StatusOK {
+		t.Errorf("POST unknow returned HTTP status code %v.\nExpected %v", resp.Code, http.StatusOK)
+	}
+}