| 22 | } |
| 23 | |
| 24 | func TestMiddleware(t *testing.T) { |
| 25 | var ( |
| 26 | traceID = "testTraceID" |
| 27 | spanID = "testSpanID" |
| 28 | newTraceID = func() string { return traceID } |
| 29 | newID = func() string { return spanID } |
| 30 | discard = regexp.MustCompile("^/$") |
| 31 | ) |
| 32 | |
| 33 | cases := map[string]struct { |
| 34 | Rate int |
| 35 | TraceID, ParentSpanID string |
| 36 | Discard *regexp.Regexp |
| 37 | // output |
| 38 | CtxTraceID, CtxSpanID, CtxParentID string |
| 39 | }{ |
| 40 | "no-trace": {100, "", "", nil, traceID, spanID, ""}, |
| 41 | "no-trace-discarded": {100, "", "", discard, "", "", ""}, |
| 42 | "trace": {100, "trace", "", nil, "trace", spanID, ""}, |
| 43 | "trace-not-discarded": {100, "trace", "", discard, "trace", spanID, ""}, |
| 44 | "parent": {100, "trace", "parent", nil, "trace", spanID, "parent"}, |
| 45 | "parent-not-discarded": {100, "trace", "parent", discard, "trace", spanID, "parent"}, |
| 46 | |
| 47 | "zero-rate-no-trace": {0, "", "", nil, "", "", ""}, |
| 48 | "zero-rate-trace": {0, "trace", "", nil, "trace", spanID, ""}, |
| 49 | "zero-rate-trace-not-discarded": {0, "trace", "", discard, "trace", spanID, ""}, |
| 50 | "zero-rate-parent-not-discarded": {0, "trace", "parent", discard, "trace", spanID, "parent"}, |
| 51 | } |
| 52 | |
| 53 | for k, c := range cases { |
| 54 | traceOptions := []middleware.TraceOption{ |
| 55 | httpm.SamplingPercent(c.Rate), |
| 56 | httpm.SpanIDFunc(newID), |
| 57 | httpm.TraceIDFunc(newTraceID), |
| 58 | } |
| 59 | if c.Discard != nil { |
| 60 | traceOptions = append(traceOptions, httpm.DiscardFromTrace(c.Discard)) |
| 61 | } |
| 62 | var ( |
| 63 | m = httpm.Trace(traceOptions...) |
| 64 | h = new(testHandler) |
| 65 | headers = make(http.Header) |
| 66 | ) |
| 67 | if c.TraceID != "" { |
| 68 | headers.Set(httpm.TraceIDHeader, c.TraceID) |
| 69 | } |
| 70 | if c.ParentSpanID != "" { |
| 71 | headers.Set(httpm.ParentSpanIDHeader, c.ParentSpanID) |
| 72 | } |
| 73 | req, _ := http.NewRequest("GET", "/", nil) |
| 74 | req.Header = headers |
| 75 | |
| 76 | m(h).ServeHTTP(httptest.NewRecorder(), req) |
| 77 | |
| 78 | var ctxTraceID, ctxSpanID, ctxParentID string |
| 79 | { |
| 80 | ctx := h.Context |
| 81 | if traceID := ctx.Value(middleware.TraceIDKey); traceID != nil { |