Eventually(getMetricNames).Should(ContainElement("numGoRoutines"))
})
It("emits all memoryStats metrics", func() {
perform()
Eventually(getMetricNames).Should(ContainElement("memoryStats.numBytesAllocatedHeap"))
Eventually(getMetricNames).Should(ContainElement("memoryStats.numBytesAllocatedStack"))
Eventually(getMetricNames).Should(ContainElement("memoryStats.numBytesAllocated"))
Eventually(getMetricNames).Should(ContainElement("memoryStats.numMallocs"))
Eventually(getMetricNames).Should(ContainElement("memoryStats.numFrees"))
Eventually(getMetricNames).Should(ContainElement("memoryStats.lastGCPauseTimeNS"))
})
It("logs an error if emitting fails", func() {
fakeEventEmitter.ReturnError = errors.New("fake error")
fakeLogWriter := &fakeLogWriter{make(chan []byte)}
log.SetOutput(fakeLogWriter)
perform()
Eventually(fakeLogWriter.writeChan).Should(Receive(ContainSubstring("fake error")))
})
})
type fakeLogWriter struct {
writeChan chan []byte
}
func (w *fakeLogWriter) Write(p []byte) (int, error) {
w.writeChan <- p
return len(p), nil
}
It("emits on a timer", func() {
Eventually(emitter.GetEvents).Should(ContainElement(&events.ValueMetric{Name: proto.String("logSenderTotalMessagesRead"), Value: proto.Float64(0), Unit: proto.String("count")}))
Eventually(func() int { return len(emitter.GetEvents()) }).Should(BeNumerically(">", 3))
sender.SendAppLog("app-id", "custom-log-message", "App", "0")
Eventually(emitter.GetEvents).Should(ContainElement(&events.ValueMetric{Name: proto.String("logSenderTotalMessagesRead"), Value: proto.Float64(1), Unit: proto.String("count")}))
sender.SendAppLog("app-id", "custom-log-message", "App", "0")
Eventually(emitter.GetEvents).Should(ContainElement(&events.ValueMetric{Name: proto.String("logSenderTotalMessagesRead"), Value: proto.Float64(2), Unit: proto.String("count")}))
})
})
Context("when messages cannot be emitted", func() {
BeforeEach(func() {
emitter.ReturnError = errors.New("expected error")
})
Describe("SendAppLog", func() {
It("sends an error when log messages cannot be emitted", func() {
err := sender.SendAppLog("app-id", "custom-log-message", "App", "0")
Expect(err).To(HaveOccurred())
})
})
Describe("SendAppErrorLog", func() {
It("sends an error when log error messages cannot be emitted", func() {
err := sender.SendAppErrorLog("app-id", "custom-log-error-message", "App", "0")
Expect(err).To(HaveOccurred())
})
sender = metric_sender.NewMetricSender(emitter)
})
It("sends a metric to its emitter", func() {
err := sender.SendValue("metric-name", 42, "answers")
Expect(err).NotTo(HaveOccurred())
Expect(emitter.Messages).To(HaveLen(1))
metric := emitter.Messages[0].Event.(*events.ValueMetric)
Expect(metric.GetName()).To(Equal("metric-name"))
Expect(metric.GetValue()).To(BeNumerically("==", 42))
Expect(metric.GetUnit()).To(Equal("answers"))
})
It("returns an error if it can't send metric value", func() {
emitter.ReturnError = errors.New("some error")
err := sender.SendValue("stuff", 12, "no answer")
Expect(emitter.Messages).To(HaveLen(0))
Expect(err.Error()).To(Equal("some error"))
})
It("sends an update counter event to its emitter", func() {
err := sender.IncrementCounter("counter-strike")
Expect(err).NotTo(HaveOccurred())
Expect(emitter.Messages).To(HaveLen(1))
counterEvent := emitter.Messages[0].Event.(*events.CounterEvent)
Expect(counterEvent.GetName()).To(Equal("counter-strike"))
})
sender = metric_sender.NewMetricSender(emitter)
})
It("sends a metric to its emitter", func() {
err := sender.SendValue("metric-name", 42, "answers")
Expect(err).NotTo(HaveOccurred())
Expect(emitter.GetMessages()).To(HaveLen(1))
metric := emitter.GetMessages()[0].Event.(*events.ValueMetric)
Expect(metric.GetName()).To(Equal("metric-name"))
Expect(metric.GetValue()).To(BeNumerically("==", 42))
Expect(metric.GetUnit()).To(Equal("answers"))
})
It("returns an error if it can't send metric value", func() {
emitter.ReturnError = errors.New("some error")
err := sender.SendValue("stuff", 12, "no answer")
Expect(emitter.GetMessages()).To(HaveLen(0))
Expect(err.Error()).To(Equal("some error"))
})
It("sends an update counter event to its emitter", func() {
err := sender.IncrementCounter("counter-strike")
Expect(err).NotTo(HaveOccurred())
Expect(emitter.GetMessages()).To(HaveLen(1))
counterEvent := emitter.GetMessages()[0].Event.(*events.CounterEvent)
Expect(counterEvent.GetName()).To(Equal("counter-strike"))
Expect(counterEvent.GetDelta()).To(Equal(uint64(1)))
})
)
BeforeEach(func() {
envOrigin = "original-origin"
emitter = fake.NewFakeEventEmitter("origin")
sender = envelope_sender.NewEnvelopeSender(emitter)
})
It("sends an Envelope to its emitter", func() {
err := sender.SendEnvelope(createTestEnvelope(envOrigin))
Expect(err).NotTo(HaveOccurred())
Expect(emitter.GetEnvelopes()).To(HaveLen(1))
envelope := emitter.GetEnvelopes()[0]
metric := envelope.ValueMetric
Expect(metric.GetName()).To(Equal("metric-name"))
Expect(metric.GetValue()).To(BeNumerically("==", 42))
Expect(metric.GetUnit()).To(Equal("answers"))
Expect(envelope.Origin).To(Equal(proto.String(envOrigin)))
})
It("returns an error if it can't send metric value", func() {
emitter.ReturnError = errors.New("some error")
err := sender.SendEnvelope(createTestEnvelope(envOrigin))
Expect(emitter.GetMessages()).To(HaveLen(0))
Expect(err.Error()).To(Equal("some error"))
})
})
