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Added support for Trace name truncation for traces

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This commit is contained in:
Alex Antonov 2018-07-31 17:16:03 -05:00 committed by Traefiker Bot
parent ed0c7d9c49
commit 4d79c2a6d2
8 changed files with 404 additions and 14 deletions
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7
cmd/configuration.go
View file

@ -9,6 +9,7 @@ import (
"github.com/containous/traefik/configuration"
"github.com/containous/traefik/middlewares/accesslog"
"github.com/containous/traefik/middlewares/tracing"
"github.com/containous/traefik/middlewares/tracing/datadog"
"github.com/containous/traefik/middlewares/tracing/jaeger"
"github.com/containous/traefik/middlewares/tracing/zipkin"
"github.com/containous/traefik/ping"
@ -220,6 +221,7 @@ func NewTraefikDefaultPointersConfiguration() *TraefikConfiguration {
defaultTracing := tracing.Tracing{
Backend: "jaeger",
ServiceName: "traefik",
SpanNameLimit: 0,
Jaeger: &jaeger.Config{
SamplingServerURL: "http://localhost:5778/sampling",
SamplingType: "const",
@ -232,6 +234,11 @@ func NewTraefikDefaultPointersConfiguration() *TraefikConfiguration {
ID128Bit: true,
Debug: false,
},
DataDog: &datadog.Config{
LocalAgentHostPort: "localhost:8126",
GlobalTag: "",
Debug: false,
},
}
// default LifeCycle

21
docs/configuration/tracing.md
View file

@ -23,6 +23,13 @@ Træfik supports two backends: Jaeger and Zipkin.
#
serviceName = "traefik"
# Span name limit allows for name truncation in case of very long Frontend/Backend names
# This can prevent certain tracing providers to drop traces that exceed their length limits
#
# Default: 0 - no truncation will occur
#
spanNameLimit = 0
[tracing.jaeger]
# Sampling Server URL is the address of jaeger-agent's HTTP sampling server
#
@ -73,6 +80,13 @@ Træfik supports two backends: Jaeger and Zipkin.
#
serviceName = "traefik"
# Span name limit allows for name truncation in case of very long Frontend/Backend names
# This can prevent certain tracing providers to drop traces that exceed their length limits
#
# Default: 0 - no truncation will occur
#
spanNameLimit = 150
[tracing.zipkin]
# Zipking HTTP endpoint used to send data
#
@ -116,6 +130,13 @@ Træfik supports two backends: Jaeger and Zipkin.
#
serviceName = "traefik"
# Span name limit allows for name truncation in case of very long Frontend/Backend names
# This can prevent certain tracing providers to drop traces that exceed their length limits
#
# Default: 0 - no truncation will occur
#
spanNameLimit = 100
[tracing.datadog]
# Local Agent Host Port instructs reporter to send spans to datadog-tracing-agent at this address
#

23
middlewares/tracing/entrypoint.go
View file

@ -22,12 +22,10 @@ func (t *Tracing) NewEntryPoint(name string) negroni.Handler {
}
func (e *entryPointMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request, next http.HandlerFunc) {
opNameFunc := func(r *http.Request) string {
return fmt.Sprintf("Entrypoint %s %s", e.entryPoint, r.Host)
}
opNameFunc := generateEntryPointSpanName
ctx, _ := e.Extract(opentracing.HTTPHeaders, opentracing.HTTPHeadersCarrier(r.Header))
span := e.StartSpan(opNameFunc(r), ext.RPCServerOption(ctx))
span := e.StartSpan(opNameFunc(r, e.entryPoint, e.SpanNameLimit), ext.RPCServerOption(ctx))
ext.Component.Set(span, e.ServiceName)
LogRequest(span, r)
ext.SpanKindRPCServer.Set(span)
@ -40,3 +38,20 @@ func (e *entryPointMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request,
LogResponseCode(span, recorder.Status())
span.Finish()
}
// generateEntryPointSpanName will return a Span name of an appropriate lenth based on the 'spanLimit' argument. If needed, it will be truncated, but will not be less than 24 characters.
func generateEntryPointSpanName(r *http.Request, entryPoint string, spanLimit int) string {
name := fmt.Sprintf("Entrypoint %s %s", entryPoint, r.Host)
if spanLimit > 0 && len(name) > spanLimit {
if spanLimit < EntryPointMaxLengthNumber {
log.Warnf("SpanNameLimit is set to be less than required static number of characters, defaulting to %d + 3", EntryPointMaxLengthNumber)
spanLimit = EntryPointMaxLengthNumber + 3
}
hash := computeHash(name)
limit := (spanLimit - EntryPointMaxLengthNumber) / 2
name = fmt.Sprintf("Entrypoint %s %s %s", truncateString(entryPoint, limit), truncateString(r.Host, limit), hash)
}
return name
}

69
middlewares/tracing/entrypoint_test.go Normal file
View file

@ -0,0 +1,69 @@
package tracing
import (
"net/http"
"net/http/httptest"
"testing"
"github.com/opentracing/opentracing-go/ext"
"github.com/stretchr/testify/assert"
)
func TestEntryPointMiddlewareServeHTTP(t *testing.T) {
expectedTags := map[string]interface{}{
"span.kind": ext.SpanKindRPCServerEnum,
"http.method": "GET",
"component": "",
"http.url": "http://www.test.com",
"http.host": "www.test.com",
}
testCases := []struct {
desc string
entryPoint string
tracing *Tracing
expectedTags map[string]interface{}
expectedName string
}{
{
desc: "no truncation test",
entryPoint: "test",
tracing: &Tracing{
SpanNameLimit: 0,
tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]interface{})}},
},
expectedTags: expectedTags,
expectedName: "Entrypoint test www.test.com",
}, {
desc: "basic test",
entryPoint: "test",
tracing: &Tracing{
SpanNameLimit: 25,
tracer: &MockTracer{Span: &MockSpan{Tags: make(map[string]interface{})}},
},
expectedTags: expectedTags,
expectedName: "Entrypoint te... ww... 39b97e58",
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
e := &entryPointMiddleware{
entryPoint: test.entryPoint,
Tracing: test.tracing,
}
next := func(http.ResponseWriter, *http.Request) {
span := test.tracing.tracer.(*MockTracer).Span
actual := span.Tags
assert.Equal(t, test.expectedTags, actual)
assert.Equal(t, test.expectedName, span.OpName)
}
e.ServeHTTP(httptest.NewRecorder(), httptest.NewRequest(http.MethodGet, "http://www.test.com", nil), next)
})
}
}

19
middlewares/tracing/forwarder.go
View file

@ -23,7 +23,7 @@ func (t *Tracing) NewForwarderMiddleware(frontend, backend string) negroni.Handl
Tracing: t,
frontend: frontend,
backend: backend,
opName: fmt.Sprintf("forward %s/%s", frontend, backend),
opName: generateForwardSpanName(frontend, backend, t.SpanNameLimit),
}
}
@ -44,3 +44,20 @@ func (f *forwarderMiddleware) ServeHTTP(w http.ResponseWriter, r *http.Request,
LogResponseCode(span, recorder.Status())
}
// generateForwardSpanName will return a Span name of an appropriate lenth based on the 'spanLimit' argument. If needed, it will be truncated, but will not be less than 21 characters
func generateForwardSpanName(frontend, backend string, spanLimit int) string {
name := fmt.Sprintf("forward %s/%s", frontend, backend)
if spanLimit > 0 && len(name) > spanLimit {
if spanLimit < ForwardMaxLengthNumber {
log.Warnf("SpanNameLimit is set to be less than required static number of characters, defaulting to %d + 3", ForwardMaxLengthNumber)
spanLimit = ForwardMaxLengthNumber + 3
}
hash := computeHash(name)
limit := (spanLimit - ForwardMaxLengthNumber) / 2
name = fmt.Sprintf("forward %s/%s/%s", truncateString(frontend, limit), truncateString(backend, limit), hash)
}
return name
}

93
middlewares/tracing/forwarder_test.go Normal file
View file

@ -0,0 +1,93 @@
package tracing
import (
"testing"
"github.com/stretchr/testify/assert"
)
func TestTracingNewForwarderMiddleware(t *testing.T) {
testCases := []struct {
desc string
tracer *Tracing
frontend string
backend string
expected *forwarderMiddleware
}{
{
desc: "Simple Forward Tracer without truncation and hashing",
tracer: &Tracing{
SpanNameLimit: 101,
},
frontend: "some-service.domain.tld",
backend: "some-service.domain.tld",
expected: &forwarderMiddleware{
Tracing: &Tracing{
SpanNameLimit: 101,
},
frontend: "some-service.domain.tld",
backend: "some-service.domain.tld",
opName: "forward some-service.domain.tld/some-service.domain.tld",
},
}, {
desc: "Simple Forward Tracer with truncation and hashing",
tracer: &Tracing{
SpanNameLimit: 101,
},
frontend: "some-service-100.slug.namespace.environment.domain.tld",
backend: "some-service-100.slug.namespace.environment.domain.tld",
expected: &forwarderMiddleware{
Tracing: &Tracing{
SpanNameLimit: 101,
},
frontend: "some-service-100.slug.namespace.environment.domain.tld",
backend: "some-service-100.slug.namespace.environment.domain.tld",
opName: "forward some-service-100.slug.namespace.enviro.../some-service-100.slug.namespace.enviro.../bc4a0d48",
},
},
{
desc: "Exactly 101 chars",
tracer: &Tracing{
SpanNameLimit: 101,
},
frontend: "some-service1.namespace.environment.domain.tld",
backend: "some-service1.namespace.environment.domain.tld",
expected: &forwarderMiddleware{
Tracing: &Tracing{
SpanNameLimit: 101,
},
frontend: "some-service1.namespace.environment.domain.tld",
backend: "some-service1.namespace.environment.domain.tld",
opName: "forward some-service1.namespace.environment.domain.tld/some-service1.namespace.environment.domain.tld",
},
},
{
desc: "More than 101 chars",
tracer: &Tracing{
SpanNameLimit: 101,
},
frontend: "some-service1.frontend.namespace.environment.domain.tld",
backend: "some-service1.backend.namespace.environment.domain.tld",
expected: &forwarderMiddleware{
Tracing: &Tracing{
SpanNameLimit: 101,
},
frontend: "some-service1.frontend.namespace.environment.domain.tld",
backend: "some-service1.backend.namespace.environment.domain.tld",
opName: "forward some-service1.frontend.namespace.envir.../some-service1.backend.namespace.enviro.../fa49dd23",
},
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
actual := test.tracer.NewForwarderMiddleware(test.frontend, test.backend)
assert.Equal(t, test.expected, actual)
assert.True(t, len(test.expected.opName) <= test.tracer.SpanNameLimit)
})
}
}

39
middlewares/tracing/tracing.go
View file

@ -1,6 +1,7 @@
package tracing
import (
"crypto/sha256"
"fmt"
"io"
"net/http"
@ -13,10 +14,20 @@ import (
"github.com/opentracing/opentracing-go/ext"
)
// ForwardMaxLengthNumber defines the number of static characters in the Forwarding Span Trace name : 8 chars for 'forward ' + 8 chars for hash + 2 chars for '_'.
const ForwardMaxLengthNumber = 18
// EntryPointMaxLengthNumber defines the number of static characters in the Entrypoint Span Trace name : 11 chars for 'Entrypoint ' + 8 chars for hash + 2 chars for '_'.
const EntryPointMaxLengthNumber = 21
// TraceNameHashLength defines the number of characters to use from the head of the generated hash.
const TraceNameHashLength = 8
// Tracing middleware
type Tracing struct {
Backend string `description:"Selects the tracking backend ('jaeger','zipkin', 'datadog')." export:"true"`
ServiceName string `description:"Set the name for this service" export:"true"`
SpanNameLimit int `description:"Set the maximum character limit for Span names (default 0 = no limit)" export:"true"`
Jaeger *jaeger.Config `description:"Settings for jaeger"`
Zipkin *zipkin.Config `description:"Settings for zipkin"`
DataDog *datadog.Config `description:"Settings for DataDog"`
@ -147,16 +158,40 @@ func SetError(r *http.Request) {
}
}
// SetErrorAndDebugLog flags the span associated with this request as in error and create a debug log
// SetErrorAndDebugLog flags the span associated with this request as in error and create a debug log.
func SetErrorAndDebugLog(r *http.Request, format string, args ...interface{}) {
SetError(r)
log.Debugf(format, args...)
LogEventf(r, format, args...)
}
// SetErrorAndWarnLog flags the span associated with this request as in error and create a debug log
// SetErrorAndWarnLog flags the span associated with this request as in error and create a debug log.
func SetErrorAndWarnLog(r *http.Request, format string, args ...interface{}) {
SetError(r)
log.Warnf(format, args...)
LogEventf(r, format, args...)
}
// truncateString reduces the length of the 'str' argument to 'num' - 3 and adds a '...' suffix to the tail.
func truncateString(str string, num int) string {
text := str
if len(str) > num {
if num > 3 {
num -= 3
}
text = str[0:num] + "..."
}
return text
}
// computeHash returns the first TraceNameHashLength character of the sha256 hash for 'name' argument.
func computeHash(name string) string {
data := []byte(name)
hash := sha256.New()
if _, err := hash.Write(data); err != nil {
// Impossible case
log.Errorf("Fail to create Span name hash for %s: %v", name, err)
}
return fmt.Sprintf("%x", hash.Sum(nil))[:TraceNameHashLength]
}

133
middlewares/tracing/tracing_test.go Normal file
View file

@ -0,0 +1,133 @@
package tracing
import (
"testing"
"github.com/opentracing/opentracing-go"
"github.com/opentracing/opentracing-go/log"
"github.com/stretchr/testify/assert"
)
type MockTracer struct {
Span *MockSpan
}
type MockSpan struct {
OpName string
Tags map[string]interface{}
}
type MockSpanContext struct {
}
// MockSpanContext:
func (n MockSpanContext) ForeachBaggageItem(handler func(k, v string) bool) {}
// MockSpan:
func (n MockSpan) Context() opentracing.SpanContext { return MockSpanContext{} }
func (n MockSpan) SetBaggageItem(key, val string) opentracing.Span {
return MockSpan{Tags: make(map[string]interface{})}
}
func (n MockSpan) BaggageItem(key string) string { return "" }
func (n MockSpan) SetTag(key string, value interface{}) opentracing.Span {
n.Tags[key] = value
return n
}
func (n MockSpan) LogFields(fields ...log.Field) {}
func (n MockSpan) LogKV(keyVals ...interface{}) {}
func (n MockSpan) Finish() {}
func (n MockSpan) FinishWithOptions(opts opentracing.FinishOptions) {}
func (n MockSpan) SetOperationName(operationName string) opentracing.Span { return n }
func (n MockSpan) Tracer() opentracing.Tracer { return MockTracer{} }
func (n MockSpan) LogEvent(event string) {}
func (n MockSpan) LogEventWithPayload(event string, payload interface{}) {}
func (n MockSpan) Log(data opentracing.LogData) {}
func (n MockSpan) Reset() {
n.Tags = make(map[string]interface{})
}
// StartSpan belongs to the Tracer interface.
func (n MockTracer) StartSpan(operationName string, opts ...opentracing.StartSpanOption) opentracing.Span {
n.Span.OpName = operationName
return n.Span
}
// Inject belongs to the Tracer interface.
func (n MockTracer) Inject(sp opentracing.SpanContext, format interface{}, carrier interface{}) error {
return nil
}
// Extract belongs to the Tracer interface.
func (n MockTracer) Extract(format interface{}, carrier interface{}) (opentracing.SpanContext, error) {
return nil, opentracing.ErrSpanContextNotFound
}
func TestTruncateString(t *testing.T) {
testCases := []struct {
desc string
text string
limit int
expected string
}{
{
desc: "short text less than limit 10",
text: "short",
limit: 10,
expected: "short",
},
{
desc: "basic truncate with limit 10",
text: "some very long pice of text",
limit: 10,
expected: "some ve...",
},
{
desc: "truncate long FQDN to 39 chars",
text: "some-service-100.slug.namespace.environment.domain.tld",
limit: 39,
expected: "some-service-100.slug.namespace.envi...",
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
actual := truncateString(test.text, test.limit)
assert.Equal(t, test.expected, actual)
assert.True(t, len(actual) <= test.limit)
})
}
}
func TestComputeHash(t *testing.T) {
testCases := []struct {
desc string
text string
expected string
}{
{
desc: "hashing",
text: "some very long pice of text",
expected: "0258ea1c",
},
{
desc: "short text less than limit 10",
text: "short",
expected: "f9b0078b",
},
}
for _, test := range testCases {
test := test
t.Run(test.desc, func(t *testing.T) {
t.Parallel()
actual := computeHash(test.text)
assert.Equal(t, test.expected, actual)
})
}
}