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Add a low-level MetricFamily injection hook. 

This hook is needed for the upcoming push gateway.

Also remove go vet warnings and add test for Handler().

Change-Id: If6c56676c7a0f10c16b4effae7285903f8267616
This commit is contained in:
Bjoern Rabenstein 2014-04-02 13:31:22 +02:00
parent 7524a7a115
commit ee34486fa1
3 changed files with 330 additions and 9 deletions
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37
prometheus/registry.go
View File

@ -68,6 +68,7 @@ func (c containers) Less(i, j int) bool {
type registry struct {
mutex sync.RWMutex
signatureContainers map[uint64]*container
metricFamilyInjectionHook func() []*dto.MetricFamily
}
// Registry is a registrar where metrics are listed.
@ -77,11 +78,23 @@ type registry struct {
type Registry interface {
// Register a metric with a given name. Name should be globally unique.
Register(name, docstring string, baseLabels map[string]string, metric Metric) error
// Create a http.HandlerFunc that is tied to a Registry such that requests
// against it generate a representation of the housed metrics.
// SetMetricFamilyInjectionHook sets a function that is called whenever
// metrics are requested. The MetricsFamily protobufs returned by the
// function are appended to the delivered metrics. This is a way to
// directly inject MetricFamily protobufs managed and owned by the
// caller. The caller has full responsibility. No sanity checks are
// performed on the returned protobufs. The function must be callable at
// any time and concurrently. The only thing handled by the Registry is
// the conversion if metrics are requested in a non-protobuf format. The
// deprecated JSON format, however, is not supported, i.e. metrics
// delivered as JSON will not contain the metrics injected by the
// injection hook.
SetMetricFamilyInjectionHook(func() []*dto.MetricFamily)
// Handler creates a http.HandlerFunc. Requests against it generate a
// representation of the metrics managed by this registry.
Handler() http.HandlerFunc
// This is a legacy version of Handler and is deprecated. Please stop
// using.
// YieldExporter is a legacy version of Handler and is deprecated.
// Please stop using.
YieldExporter() http.HandlerFunc
}
@ -98,6 +111,11 @@ func Register(name, docstring string, baseLabels map[string]string, metric Metri
return DefaultRegistry.Register(name, docstring, baseLabels, metric)
}
// SetMetricFamilyInjectionHook implements the Registry interface.
func (r *registry) SetMetricFamilyInjectionHook(hook func() []*dto.MetricFamily) {
r.metricFamilyInjectionHook = hook
}
// Implements json.Marshaler
func (r *registry) MarshalJSON() ([]byte, error) {
containers := make(containers, 0, len(r.signatureContainers))
@ -277,6 +295,15 @@ func (r *registry) dumpDelimitedPB(w io.Writer) {
}
}
func (r *registry) dumpDelimitedExternalPB(w io.Writer) {
if r.metricFamilyInjectionHook == nil {
return
}
for _, f := range r.metricFamilyInjectionHook() {
ext.WriteDelimited(w, f)
}
}
func (registry *registry) Handler() http.HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
defer requestLatencyAccumulator(time.Now())
@ -306,7 +333,7 @@ func (registry *registry) Handler() http.HandlerFunc {
header.Set(contentTypeHeader, DelimitedTelemetryContentType)
registry.dumpDelimitedPB(writer)
registry.dumpDelimitedExternalPB(writer)
return
}
}

296
prometheus/registry_test.go
View File

@ -8,12 +8,15 @@ package prometheus
import (
"bytes"
"encoding/binary"
"encoding/json"
"fmt"
"io"
"net/http"
"testing"
dto "github.com/prometheus/client_model/go"
"code.google.com/p/goprotobuf/proto"
"github.com/prometheus/client_golang/model"
@ -170,7 +173,7 @@ func testRegister(t tester) {
for j, input := range scenario.inputs {
actual := registry.Register(input.name, "", input.baseLabels, nil)
if scenario.outputs[j] != (actual == nil) {
t.Errorf("%d.%d. expected %s, got %s", i, j, scenario.outputs[j], actual)
t.Errorf("%d.%d. expected %t, got %t", i, j, scenario.outputs[j], actual == nil)
}
}
}
@ -202,6 +205,297 @@ func (r *fakeResponseWriter) Write(d []byte) (l int, err error) {
func (r *fakeResponseWriter) WriteHeader(c int) {
}
func testHandler(t tester) {
metric := NewCounter()
metric.Increment(map[string]string{"labelname": "val1"})
metric.Increment(map[string]string{"labelname": "val2"})
varintBuf := make([]byte, binary.MaxVarintLen32)
externalMetricFamily := []*dto.MetricFamily{
&dto.MetricFamily{
Name: proto.String("externalname"),
Help: proto.String("externaldocstring"),
Type: dto.MetricType_COUNTER.Enum(),
Metric: []*dto.Metric{
&dto.Metric{
Label: []*dto.LabelPair{
&dto.LabelPair{
Name: proto.String("externallabelname"),
Value: proto.String("externalval1"),
},
&dto.LabelPair{
Name: proto.String("externalbasename"),
Value: proto.String("externalbasevalue"),
},
&dto.LabelPair{
Name: proto.String("__name__"),
Value: proto.String("externalname"),
},
},
Counter: &dto.Counter{
Value: proto.Float64(1),
},
},
},
},
}
marshaledExternalMetricFamily, err := proto.Marshal(externalMetricFamily[0])
if err != nil {
t.Fatal(err)
}
var externalBuf bytes.Buffer
l := binary.PutUvarint(varintBuf, uint64(len(marshaledExternalMetricFamily)))
_, err = externalBuf.Write(varintBuf[:l])
if err != nil {
t.Fatal(err)
}
_, err = externalBuf.Write(marshaledExternalMetricFamily)
if err != nil {
t.Fatal(err)
}
externalMetricFamilyAsBytes := externalBuf.Bytes()
expectedMetricFamily := &dto.MetricFamily{
Name: proto.String("name"),
Help: proto.String("docstring"),
Type: dto.MetricType_COUNTER.Enum(),
Metric: []*dto.Metric{
&dto.Metric{
Label: []*dto.LabelPair{
&dto.LabelPair{
Name: proto.String("labelname"),
Value: proto.String("val1"),
},
&dto.LabelPair{
Name: proto.String("basename"),
Value: proto.String("basevalue"),
},
&dto.LabelPair{
Name: proto.String("__name__"),
Value: proto.String("name"),
},
},
Counter: &dto.Counter{
Value: proto.Float64(1),
},
},
&dto.Metric{
Label: []*dto.LabelPair{
&dto.LabelPair{
Name: proto.String("labelname"),
Value: proto.String("val2"),
},
&dto.LabelPair{
Name: proto.String("basename"),
Value: proto.String("basevalue"),
},
&dto.LabelPair{
Name: proto.String("__name__"),
Value: proto.String("name"),
},
},
Counter: &dto.Counter{
Value: proto.Float64(1),
},
},
},
}
marshaledExpectedMetricFamily, err := proto.Marshal(expectedMetricFamily)
if err != nil {
t.Fatal(err)
}
var buf bytes.Buffer
l = binary.PutUvarint(varintBuf, uint64(len(marshaledExpectedMetricFamily)))
_, err = buf.Write(varintBuf[:l])
if err != nil {
t.Fatal(err)
}
_, err = buf.Write(marshaledExpectedMetricFamily)
if err != nil {
t.Fatal(err)
}
expectedMetricFamilyAsBytes := buf.Bytes()
type output struct {
headers map[string]string
body []byte
}
var scenarios = []struct {
headers map[string]string
out output
withCounter bool
withExternalMF bool
}{
{
headers: map[string]string{
"Accept": "foo/bar;q=0.2, dings/bums;q=0.8",
},
out: output{
headers: map[string]string{
"Content-Type": `application/json; schema="prometheus/telemetry"; version=0.0.2`,
},
body: []byte("[]\n"),
},
},
{
headers: map[string]string{
"Accept": "foo/bar;q=0.2, application/quark;q=0.8",
},
out: output{
headers: map[string]string{
"Content-Type": `application/json; schema="prometheus/telemetry"; version=0.0.2`,
},
body: []byte("[]\n"),
},
},
{
headers: map[string]string{
"Accept": "foo/bar;q=0.2, application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=bla;q=0.8",
},
out: output{
headers: map[string]string{
"Content-Type": `application/json; schema="prometheus/telemetry"; version=0.0.2`,
},
body: []byte("[]\n"),
},
},
{
headers: map[string]string{
"Accept": "foo/bar;q=0.2, application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=delimited;q=0.8",
},
out: output{
headers: map[string]string{
"Content-Type": `application/vnd.google.protobuf; proto="io.prometheus.client.MetricFamily"; encoding="delimited"`,
},
body: []byte{},
},
},
{
headers: map[string]string{
"Accept": "application/json",
},
out: output{
headers: map[string]string{
"Content-Type": `application/json; schema="prometheus/telemetry"; version=0.0.2`,
},
body: []byte(`[{"baseLabels":{"__name__":"name","basename":"basevalue"},"docstring":"docstring","metric":{"type":"counter","value":[{"labels":{"labelname":"val1"},"value":1},{"labels":{"labelname":"val2"},"value":1}]}}]
`),
},
withCounter: true,
},
{
headers: map[string]string{
"Accept": "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=delimited",
},
out: output{
headers: map[string]string{
"Content-Type": `application/vnd.google.protobuf; proto="io.prometheus.client.MetricFamily"; encoding="delimited"`,
},
body: expectedMetricFamilyAsBytes,
},
withCounter: true,
},
{
headers: map[string]string{
"Accept": "application/json",
},
out: output{
headers: map[string]string{
"Content-Type": `application/json; schema="prometheus/telemetry"; version=0.0.2`,
},
body: []byte("[]\n"),
},
withExternalMF: true,
},
{
headers: map[string]string{
"Accept": "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=delimited",
},
out: output{
headers: map[string]string{
"Content-Type": `application/vnd.google.protobuf; proto="io.prometheus.client.MetricFamily"; encoding="delimited"`,
},
body: externalMetricFamilyAsBytes,
},
withExternalMF: true,
},
{
headers: map[string]string{
"Accept": "application/vnd.google.protobuf;proto=io.prometheus.client.MetricFamily;encoding=delimited",
},
out: output{
headers: map[string]string{
"Content-Type": `application/vnd.google.protobuf; proto="io.prometheus.client.MetricFamily"; encoding="delimited"`,
},
body: bytes.Join(
[][]byte{
expectedMetricFamilyAsBytes,
externalMetricFamilyAsBytes,
},
[]byte{},
),
},
withCounter: true,
withExternalMF: true,
},
}
for i, scenario := range scenarios {
registry := NewRegistry().(*registry)
if scenario.withCounter {
registry.Register(
"name", "docstring",
map[string]string{"basename": "basevalue"},
metric,
)
}
if scenario.withExternalMF {
registry.SetMetricFamilyInjectionHook(
func() []*dto.MetricFamily {
return externalMetricFamily
},
)
}
writer := &fakeResponseWriter{
header: http.Header{},
}
handler := registry.Handler()
request, _ := http.NewRequest("GET", "/", nil)
for key, value := range scenario.headers {
request.Header.Add(key, value)
}
handler(writer, request)
for key, value := range scenario.out.headers {
if writer.Header().Get(key) != value {
t.Errorf(
"%d. expected %q for header %q, got %q",
i, value, key, writer.Header().Get(key),
)
}
}
if !bytes.Equal(scenario.out.body, writer.body.Bytes()) {
t.Errorf(
"%d. expected %q for body, got %q",
i, scenario.out.body, writer.body.Bytes(),
)
}
}
}
func TestHander(t *testing.T) {
testHandler(t)
}
func BenchmarkHandler(b *testing.B) {
for i := 0; i < b.N; i++ {
testHandler(b)
}
}
func testDecorateWriter(t tester) {
type input struct {
headers map[string]string

2
prometheus/signature_test.go
View File

@ -30,7 +30,7 @@ func testLabelsToSignature(t tester) {
actual := labelsToSignature(scenario.in)
if actual != scenario.out {
t.Errorf("%d. expected %s, got %s", i, scenario.out, actual)
t.Errorf("%d. expected %d, got %d", i, scenario.out, actual)
}
}
}