/*
Wraps the RoundTrip function of the given RoundTripper.
Will provide accounting metrics for the http.Request / http.Response life-cycle
Callers of RoundTrip are responsible for setting the ‘X-CF-RequestID’ field in the request header if they have one.
Callers are also responsible for setting the ‘X-CF-ApplicationID’ and ‘X-CF-InstanceIndex’ fields in the request header if they are known.
*/
func (irt *instrumentedRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
requestId, err := GenerateUuid()
if err != nil {
log.Printf("failed to generated request ID: %v\n", err)
requestId = &uuid.UUID{}
}
startTime := time.Now()
parentRequestId := req.Header.Get("X-CF-RequestID")
req.Header.Set("X-CF-RequestID", requestId.String())
resp, roundTripErr := irt.roundTripper.RoundTrip(req)
var statusCode int
var contentLength int64
if roundTripErr == nil {
statusCode = resp.StatusCode
contentLength = resp.ContentLength
}
httpStartStop := factories.NewHttpStartStop(req, statusCode, contentLength, events.PeerType_Client, requestId)
if parentRequestId != "" {
if id, err := uuid.ParseHex(parentRequestId); err == nil {
httpStartStop.ParentRequestId = factories.NewUUID(id)
}
}
httpStartStop.StartTimestamp = proto.Int64(startTime.UnixNano())
err = irt.emitter.Emit(httpStartStop)
if err != nil {
log.Printf("failed to emit startstop event: %v\n", err)
}
return resp, roundTripErr
}
func basicHTTPStopEventEnvelope() *events.Envelope {
uuid, _ := uuid.ParseHex("9f45fa9d-dbf8-463e-425f-a79d30e1b56f")
return &events.Envelope{
Origin: proto.String("fake-origin-2"),
EventType: events.Envelope_HttpStop.Enum(),
HttpStop: &events.HttpStop{
Timestamp: proto.Int64(12),
Uri: proto.String("some uri"),
RequestId: factories.NewUUID(uuid),
PeerType: events.PeerType_Client.Enum(),
StatusCode: proto.Int32(404),
ContentLength: proto.Int64(98475189),
},
}
}
func basicHTTPStopMessageEnvelope(requestId string) *events.Envelope {
uuid, _ := uuid.ParseHex(requestId)
return &events.Envelope{
Origin: proto.String("fake-origin-2"),
EventType: events.Envelope_HttpStop.Enum(),
HttpStop: &events.HttpStop{
Timestamp: proto.Int64(12),
Uri: proto.String("some uri"),
RequestId: factories.NewUUID(uuid),
PeerType: events.PeerType_Client.Enum(),
StatusCode: proto.Int32(404),
ContentLength: proto.Int64(98475189),
},
}
}
func basicHTTPStartEventEnvelope() *events.Envelope {
uuid, _ := uuid.ParseHex("9f45fa9d-dbf8-463e-425f-a79d30e1b56f")
return &events.Envelope{
Origin: proto.String("fake-origin-2"),
EventType: events.Envelope_HttpStart.Enum(),
HttpStart: &events.HttpStart{
Timestamp: proto.Int64(12),
RequestId: factories.NewUUID(uuid),
PeerType: events.PeerType_Client.Enum(),
Method: events.Method_GET.Enum(),
Uri: proto.String("some uri"),
RemoteAddress: proto.String("some address"),
UserAgent: proto.String("some user agent"),
},
}
}
/*
Wraps the RoundTrip function of the given RoundTripper.
Will provide accounting metrics for the http.Request / http.Response life-cycle
Callers of RoundTrip are responsible for setting the ‘X-CF-RequestID’ field in the request header if they have one.
Callers are also responsible for setting the ‘X-CF-ApplicationID’ and ‘X-CF-InstanceIndex’ fields in the request header if they are known.
*/
func (irt *instrumentedRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
requestId, err := GenerateUuid()
if err != nil {
log.Printf("failed to generated request ID: %v\n", err)
requestId = &uuid.UUID{}
}
httpStart := factories.NewHttpStart(req, events.PeerType_Client, requestId)
parentRequestId, err := uuid.ParseHex(req.Header.Get("X-CF-RequestID"))
if err == nil {
httpStart.ParentRequestId = factories.NewUUID(parentRequestId)
}
req.Header.Set("X-CF-RequestID", requestId.String())
err = irt.emitter.Emit(httpStart)
if err != nil {
log.Printf("failed to emit start event: %v\n", err)
}
resp, roundTripErr := irt.roundTripper.RoundTrip(req)
var httpStop *events.HttpStop
if roundTripErr != nil {
httpStop = factories.NewHttpStop(req, 0, 0, events.PeerType_Client, requestId)
} else {
httpStop = factories.NewHttpStop(req, resp.StatusCode, resp.ContentLength, events.PeerType_Client, requestId)
}
err = irt.emitter.Emit(httpStop)
if err != nil {
log.Printf("failed to emit stop event: %v\n", err)
}
return resp, roundTripErr
}
req.Header.Set("X-Vcap-Request-Id", requestId.String())
conn.WriteRequest(req)
findStartStopEvent := func() *events.HttpStartStop {
for _, event := range fakeEmitter.GetEvents() {
startStopEvent, ok := event.(*events.HttpStartStop)
if ok {
return startStopEvent
}
}
return nil
}
Eventually(findStartStopEvent).ShouldNot(BeNil())
Expect(findStartStopEvent().GetParentRequestId()).To(Equal(factories.NewUUID(requestId)))
conn.ReadResponse()
})
It("X-CF-InstanceID header is added with host:port information if NOT present in the routing endpoint", func() {
done := make(chan string)
ln := registerHandler(r, "app", func(conn *test_util.HttpConn) {
req, err := http.ReadRequest(conn.Reader)
Expect(err).NotTo(HaveOccurred())
resp := test_util.NewResponse(http.StatusOK)
conn.WriteResponse(resp)
conn.Close()
var origin string
BeforeEach(func() {
origin = "testEventFormatter/42"
})
It("works with dropsonde status (Heartbeat) events", func() {
statusEvent := &events.Heartbeat{SentCount: proto.Uint64(1), ErrorCount: proto.Uint64(0)}
envelope, _ := emitter.Wrap(statusEvent, origin)
Expect(envelope.GetEventType()).To(Equal(events.Envelope_Heartbeat))
Expect(envelope.GetHeartbeat()).To(Equal(statusEvent))
})
It("works with HttpStart events", func() {
id, _ := uuid.NewV4()
testEvent := &events.HttpStart{RequestId: factories.NewUUID(id)}
envelope, _ := emitter.Wrap(testEvent, origin)
Expect(envelope.GetEventType()).To(Equal(events.Envelope_HttpStart))
Expect(envelope.GetHttpStart()).To(Equal(testEvent))
})
It("works with HttpStop events", func() {
id, _ := uuid.NewV4()
testEvent := &events.HttpStop{RequestId: factories.NewUUID(id)}
envelope, _ := emitter.Wrap(testEvent, origin)
Expect(envelope.GetEventType()).To(Equal(events.Envelope_HttpStop))
Expect(envelope.GetHttpStop()).To(Equal(testEvent))
})
conn.WriteRequest(req)
findStartStopEvent := func() *events.HttpStartStop {
for _, event := range fakeEmitter.GetEvents() {
startStopEvent, ok := event.(*events.HttpStartStop)
if ok {
return startStopEvent
}
}
return nil
}
Eventually(findStartStopEvent).ShouldNot(BeNil())
Expect(findStartStopEvent().RequestId).To(Equal(factories.NewUUID(requestId)))
conn.ReadResponse()
})
It("X-CF-InstanceID header is added with host:port information if NOT present in the routing endpoint", func() {
done := make(chan string)
ln := registerHandler(r, "app", func(conn *test_util.HttpConn) {
req, err := http.ReadRequest(conn.Reader)
Expect(err).NotTo(HaveOccurred())
resp := test_util.NewResponse(http.StatusOK)
conn.WriteResponse(resp)
conn.Close()
done <- req.Header.Get(router_http.CfInstanceIdHeader)
Expect(fakeEmitter.Messages[0].Event).To(BeAssignableToTypeOf(new(events.HttpStart)))
Expect(fakeEmitter.Messages[0].Origin).To(Equal("testRoundtripper/42"))
})
Context("if request ID already exists", func() {
var existingRequestId *uuid.UUID
BeforeEach(func() {
existingRequestId, _ = uuid.NewV4()
req.Header.Set("X-CF-RequestID", existingRequestId.String())
})
It("should emit the existing request ID as the parent request ID", func() {
rt.RoundTrip(req)
startEvent := fakeEmitter.Messages[0].Event.(*events.HttpStart)
Expect(startEvent.GetParentRequestId()).To(Equal(factories.NewUUID(existingRequestId)))
})
})
Context("if round tripper returns an error", func() {
It("should emit a stop event with blank response fields", func() {
fakeRoundTripper.FakeError = errors.New("fakeEmitter error")
rt.RoundTrip(req)
Expect(fakeEmitter.Messages[1].Event).To(BeAssignableToTypeOf(new(events.HttpStop)))
stopEvent := fakeEmitter.Messages[1].Event.(*events.HttpStop)
Expect(stopEvent.GetStatusCode()).To(BeNumerically("==", 0))
Expect(stopEvent.GetContentLength()).To(BeNumerically("==", 0))
})
})
BeforeEach(func() {
applicationId, _ = uuid.NewV4()
requestId, _ = uuid.NewV4()
req, _ = http.NewRequest("GET", "http://foo.example.com/", nil)
req.RemoteAddr = "127.0.0.1"
req.Header.Set("User-Agent", "our-testing-client")
})
Describe("NewHttpStart", func() {
Context("without an application ID or instanceIndex", func() {
It("should set appropriate fields", func() {
expectedStartEvent := &events.HttpStart{
RequestId: factories.NewUUID(requestId),
PeerType: events.PeerType_Server.Enum(),
Method: events.Method_GET.Enum(),
Uri: proto.String("foo.example.com/"),
RemoteAddress: proto.String("127.0.0.1"),
UserAgent: proto.String("our-testing-client"),
}
startEvent := factories.NewHttpStart(req, events.PeerType_Server, requestId)
Expect(startEvent.GetTimestamp()).ToNot(BeZero())
startEvent.Timestamp = nil
Expect(startEvent).To(Equal(expectedStartEvent))
})
})