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package opencensus
// Copyright 2018 Microsoft Corporation
//
// Licensed 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.
import (
"context"
"fmt"
"net/http"
"os"
"reflect"
"testing"
"contrib.go.opencensus.io/exporter/ocagent"
"github.com/Azure/go-autorest/tracing"
"go.opencensus.io/plugin/ochttp"
"go.opencensus.io/stats/view"
"go.opencensus.io/trace"
)
func TestNoTracingByDefault(t *testing.T) {
if expected, got := false, tracing.IsEnabled(); expected != got {
t.Fatalf("By default expected %t, got %t", expected, got)
}
if defaultTracer == nil {
t.Fatal("unexpected nil defaultTracer")
}
if defaultTracer.sampler == nil {
t.Fatal("By default expected non nil sampler")
}
if tr := defaultTracer.NewTransport(nil); tr.(*ochttp.Transport).GetStartOptions(&http.Request{}).Sampler == nil {
t.Fatalf("By default expected configured Sampler to be non-nil")
}
for n := range defaultTracer.views {
v := view.Find(n)
if v != nil {
t.Fatalf("By default expected no registered views, found %s", v.Name)
}
}
}
func TestEnableTracing(t *testing.T) {
err := Enable()
if err != nil {
t.Fatalf("Enable failed, got error %v", err)
}
if e := tracing.IsEnabled(); !e {
t.Fatalf("Enable failed, IsEnabled() is %t", e)
}
if defaultTracer.sampler != nil {
t.Fatalf("Enable failed, expected nil sampler, got %v", defaultTracer.sampler)
}
if tr := tracing.NewTransport(nil); tr.(*ochttp.Transport).GetStartOptions(&http.Request{}).Sampler != nil {
t.Fatalf("Enable failed, expected Transport.GetStartOptions.Sampler to be nil")
}
for n, v := range defaultTracer.views {
fv := view.Find(n)
if fv == nil || !reflect.DeepEqual(v, fv) {
t.Fatalf("Enable failed, view %s was not registered", n)
}
}
}
func TestTracingByEnv(t *testing.T) {
os.Setenv("AZURE_SDK_TRACING_ENABLED", "")
enableFromEnv()
if e := tracing.IsEnabled(); !e {
t.Fatalf("Enable failed, IsEnabled() is %t", e)
}
if defaultTracer.sampler != nil {
t.Fatalf("Enable failed, expected nil sampler, got %v", defaultTracer.sampler)
}
if tr := tracing.NewTransport(nil); tr.(*ochttp.Transport).GetStartOptions(&http.Request{}).Sampler != nil {
t.Fatalf("Enable failed, expected Transport.GetStartOptions.Sampler to be nil")
}
for n, v := range defaultTracer.views {
fv := view.Find(n)
if fv == nil || !reflect.DeepEqual(v, fv) {
t.Fatalf("Enable failed, view %s was not registered", n)
}
}
}
func TestEnableTracingWithAIError(t *testing.T) {
agentEndpoint := fmt.Sprintf("%s:%d", ocagent.DefaultAgentHost, ocagent.DefaultAgentPort)
if err := EnableWithAIForwarding(agentEndpoint); err != nil {
// note that even though the agent isn't running no error is
// returned, the exporter's state is simply set to disconnected.
t.Fatalf("EnableWithAIForwarding failed: %v", err)
}
if e := tracing.IsEnabled(); !e {
t.Fatalf("Enable failed, IsEnabled() is %t", e)
}
if defaultTracer.sampler != nil {
t.Fatalf("Enable failed, expected nil sampler, got %v", defaultTracer.sampler)
}
if tr := tracing.NewTransport(nil); tr.(*ochttp.Transport).GetStartOptions(&http.Request{}).Sampler != nil {
t.Fatalf("Enable failed, expected Transport.GetStartOptions.Sampler to be nil")
}
for n, v := range defaultTracer.views {
fv := view.Find(n)
if fv == nil || !reflect.DeepEqual(v, fv) {
t.Fatalf("Enable failed, view %s was not registered", n)
}
}
}
func TestDisableTracing(t *testing.T) {
Enable()
Disable()
if expected, got := false, tracing.IsEnabled(); expected != got {
t.Fatalf("By default expected %t, got %t", expected, got)
}
if defaultTracer.sampler == nil {
t.Fatal("By default expected non nil sampler")
}
if tr := defaultTracer.NewTransport(nil); tr.(*ochttp.Transport).GetStartOptions(&http.Request{}).Sampler == nil {
t.Fatalf("By default expected configured Sampler to be non-nil")
}
for n := range defaultTracer.views {
v := view.Find(n)
if v != nil {
t.Fatalf("By default expected no registered views, found %s", v.Name)
}
}
}
func TestStartSpan(t *testing.T) {
ctx := defaultTracer.StartSpan(context.Background(), "testSpan")
defer defaultTracer.EndSpan(ctx, 200, nil)
span := trace.FromContext(ctx)
if span == nil {
t.Fatal("StartSpan failed, expected non-nil span")
}
}
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