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utils_for_test.go
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utils_for_test.go
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// Copyright (c) 2016 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package main
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"runtime"
"sync"
"testing"
"github.com/opentracing/opentracing-go"
"github.com/stretchr/testify/require"
"github.com/uber/jaeger-client-go"
"github.com/yarpc/yab/encoding"
"github.com/yarpc/yab/transport"
"go.uber.org/zap"
)
// Constants useful for tests
const (
validThrift = "testdata/simple.thrift"
fooMethod = "Simple::foo"
exampleTemplate = "testdata/templates/foo.yab"
)
var _testLogger = zap.NewNop()
var (
_resolvedTChannelThrift = resolvedProtocolEncoding{protocol: transport.TChannel, enc: encoding.Thrift}
_resolvedTChannelRaw = resolvedProtocolEncoding{protocol: transport.TChannel, enc: encoding.Raw}
_resolvedGrpcProto = resolvedProtocolEncoding{protocol: transport.GRPC, enc: encoding.Protobuf}
)
type testOutput struct {
*bytes.Buffer
warnf func(string, ...interface{})
fatalf func(string, ...interface{})
}
func (t testOutput) Fatalf(format string, args ...interface{}) {
t.fatalf(format, args...)
runtime.Goexit()
}
func (t testOutput) Printf(format string, args ...interface{}) {
t.WriteString(fmt.Sprintf(format, args...))
}
func (t testOutput) Warnf(format string, args ...interface{}) {
t.warnf(format, args...)
}
func getOutput(t *testing.T) (*bytes.Buffer, *bytes.Buffer, output) {
outBuf := &bytes.Buffer{}
warnBuf := &bytes.Buffer{}
out := testOutput{
Buffer: outBuf,
warnf: func(format string, args ...interface{}) {
warnBuf.WriteString(fmt.Sprintf(format, args...))
},
fatalf: t.Errorf,
}
return outBuf, warnBuf, out
}
func writeFile(t *testing.T, prefix, contents string) string {
f, err := ioutil.TempFile("", prefix)
require.NoError(t, err, "TempFile failed")
_, err = f.WriteString(contents)
require.NoError(t, err, "Write to temp file failed")
require.NoError(t, f.Close(), "Close temp file failed")
return f.Name()
}
type debugThrottler struct {
sync.Mutex
credits int
}
func (d *debugThrottler) IsAllowed(operation string) bool {
const creditsPerDebugTrace = 1
d.Lock()
defer d.Unlock()
if d.credits >= creditsPerDebugTrace {
d.credits -= creditsPerDebugTrace
return true
}
return false
}
func newDebugThrottler(credits int) *debugThrottler {
return &debugThrottler{credits: credits}
}
type debugTraceCounter struct {
sync.Mutex
numDebugSpans int
max int
t *testing.T
}
func newDebugTraceCounter(t *testing.T, numDebugTraces int) jaeger.Reporter {
return &debugTraceCounter{numDebugSpans: 0, max: numDebugTraces, t: t}
}
func (d *debugTraceCounter) Report(span *jaeger.Span) {
d.Lock()
defer d.Unlock()
if span.Context().(jaeger.SpanContext).IsDebug() {
d.numDebugSpans += 1
}
}
func (d *debugTraceCounter) Close() {
d.Lock()
defer d.Unlock()
require.True(d.t, d.numDebugSpans <= d.max, "Incorrect number of debug traces")
}
func getTestTracer(t *testing.T, serviceName string) (opentracing.Tracer, io.Closer) {
const credits = 10
return getTestTracerWithCredits(t, serviceName, credits)
}
func getTestTracerWithCredits(t *testing.T, serviceName string, credits int) (opentracing.Tracer, io.Closer) {
return jaeger.NewTracer(
serviceName,
jaeger.NewConstSampler(true),
newDebugTraceCounter(t, credits),
jaeger.TracerOptions.DebugThrottler(newDebugThrottler(credits)),
)
}