Instana tracer implementation

vendor/github.com/instana/go-sensor/event.go

@@ -0,0 +1,78 @@
+package instana
+
+import (
+	"time"
+)
+
+// EventData is the construct serialized for the host agent
+type EventData struct {
+	Title string `json:"title"`
+	Text  string `json:"text"`
+	// Duration in milliseconds
+	Duration int `json:"duration"`
+	// Severity with value of -1, 5, 10 : see type severity
+	Severity int    `json:"severity"`
+	Plugin   string `json:"plugin,omitempty"`
+	ID       string `json:"id,omitempty"`
+	Host     string `json:"host"`
+}
+
+type severity int
+
+//Severity values for events sent to the instana agent
+const (
+	SeverityChange   severity = -1
+	SeverityWarning  severity = 5
+	SeverityCritical severity = 10
+)
+
+// Defaults for the Event API
+const (
+	ServicePlugin = "com.instana.forge.connection.http.logical.LogicalWebApp"
+	ServiceHost   = ""
+)
+
+// SendDefaultServiceEvent sends a default event which already contains the service and host
+func SendDefaultServiceEvent(title string, text string, sev severity, duration time.Duration) {
+	if sensor == nil {
+		// Since no sensor was initialized, there is no default service (as
+		// configured on the sensor) so we send blank.
+		SendServiceEvent("", title, text, sev, duration)
+	} else {
+		SendServiceEvent(sensor.serviceName, title, text, sev, duration)
+	}
+}
+
+// SendServiceEvent send an event on a specific service
+func SendServiceEvent(service string, title string, text string, sev severity, duration time.Duration) {
+	sendEvent(&EventData{
+		Title:    title,
+		Text:     text,
+		Severity: int(sev),
+		Plugin:   ServicePlugin,
+		ID:       service,
+		Host:     ServiceHost,
+		Duration: int(duration / time.Millisecond),
+	})
+}
+
+// SendHostEvent send an event on the current host
+func SendHostEvent(title string, text string, sev severity, duration time.Duration) {
+	sendEvent(&EventData{
+		Title:    title,
+		Text:     text,
+		Duration: int(duration / time.Millisecond),
+		Severity: int(sev),
+	})
+}
+
+func sendEvent(event *EventData) {
+	if sensor == nil {
+		// If the sensor hasn't initialized we do so here so that we properly
+		// discover where the host agent may be as it varies between a
+		// normal host, docker, kubernetes etc..
+		InitSensor(&Options{})
+	}
+	//we do fire & forget here, because the whole pid dance isn't necessary to send events
+	go sensor.agent.request(sensor.agent.makeURL(agentEventURL), "POST", event)
+}