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harness_test.go
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harness_test.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package apmot
import (
"encoding/json"
"io"
"testing"
opentracing "github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/harness"
"github.com/stretchr/testify/suite"
"go.elastic.co/apm"
"go.elastic.co/apm/apmtest"
"go.elastic.co/apm/module/apmhttp"
)
func TestHarness(t *testing.T) {
// NOTE(axw) we do not support binary propagation, but we patch in
// basic support *for the tests only* so we can check compatibility
// with the HTTP and text formats.
binaryInject = func(w io.Writer, traceContext apm.TraceContext) error {
return json.NewEncoder(w).Encode(apmhttp.FormatTraceparentHeader(traceContext))
}
binaryExtract = func(r io.Reader) (apm.TraceContext, error) {
var headerValue string
if err := json.NewDecoder(r).Decode(&headerValue); err != nil {
return apm.TraceContext{}, err
}
return apmhttp.ParseTraceparentHeader(headerValue)
}
defer func() {
binaryInject = binaryInjectUnsupported
binaryExtract = binaryExtractUnsupported
}()
newTracer := func() (opentracing.Tracer, func()) {
tracer := New(WithTracer(apmtest.DiscardTracer))
return tracer, func() {}
}
var done bool
defer func() {
if done {
recover()
}
}()
harness.RunAPIChecks(t, newTracer,
harness.CheckExtract(true),
harness.CheckInject(true),
harness.UseProbe(harnessAPIProbe{}),
func(s *harness.APICheckSuite) {
suite.Run(t, harnessSuiteWrapper{s})
done = true
panic("done") // prevent suite.Run(t, s)
},
)
}
type harnessSuiteWrapper struct {
*harness.APICheckSuite
}
func (w harnessSuiteWrapper) TestStartSpanWithParent() {
// APICheckSuite.TestStartSpanWithParent tests both child-of and
// follows-from. We don't support follows-from, but we don't want
// that to prevent us from testing the child-of case.
isValidSpanRef = func(ref opentracing.SpanReference) bool {
switch ref.Type {
case opentracing.ChildOfRef, opentracing.FollowsFromRef:
return true
}
return false
}
defer func() { isValidSpanRef = isChildOfSpanRef }()
w.APICheckSuite.TestStartSpanWithParent()
}
type harnessAPIProbe struct{}
func (harnessAPIProbe) SameTrace(first, second opentracing.Span) bool {
ctx1, ok := first.Context().(*spanContext)
if !ok {
return false
}
ctx2, ok := second.Context().(*spanContext)
if !ok {
return false
}
return ctx1.traceContext.Trace == ctx2.traceContext.Trace
}
func (harnessAPIProbe) SameSpanContext(span opentracing.Span, sc opentracing.SpanContext) bool {
ctx1, ok := span.Context().(*spanContext)
if !ok {
return false
}
ctx2, ok := sc.(*spanContext)
if !ok {
return false
}
return ctx1.traceContext.Trace == ctx2.traceContext.Trace &&
ctx1.traceContext.Span == ctx2.traceContext.Span
}