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Merge pull request #340 from prometheus/beorn7/deprecation 

Remove the deprecated uses of Untyped metrics
This commit is contained in:
Björn Rabenstein 2017-08-29 17:37:40 +02:00 committed by GitHub
parent 140d476395 6164fff8ce
commit 61d8c3f402
2 changed files with 28 additions and 160 deletions
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138
prometheus/untyped.go
View File

@ -13,144 +13,12 @@
package prometheus
// Untyped is a Metric that represents a single numerical value that can
// arbitrarily go up and down.
//
// An Untyped metric works the same as a Gauge. The only difference is that to
// no type information is implied.
//
// To create Untyped instances, use NewUntyped.
//
// Deprecated: The Untyped type is deprecated because it doesn't make sense in
// direct instrumentation. If you need to mirror an external metric of unknown
// type (usually while writing exporters), Use MustNewConstMetric to create an
// untyped metric instance on the fly.
type Untyped interface {
Metric
Collector
// Set sets the Untyped metric to an arbitrary value.
Set(float64)
// Inc increments the Untyped metric by 1.
Inc()
// Dec decrements the Untyped metric by 1.
Dec()
// Add adds the given value to the Untyped metric. (The value can be
// negative, resulting in a decrease.)
Add(float64)
// Sub subtracts the given value from the Untyped metric. (The value can
// be negative, resulting in an increase.)
Sub(float64)
}
// UntypedOpts is an alias for Opts. See there for doc comments.
type UntypedOpts Opts
// NewUntyped creates a new Untyped metric from the provided UntypedOpts.
func NewUntyped(opts UntypedOpts) Untyped {
return newValue(NewDesc(
BuildFQName(opts.Namespace, opts.Subsystem, opts.Name),
opts.Help,
nil,
opts.ConstLabels,
), UntypedValue, 0)
}
// UntypedVec is a Collector that bundles a set of Untyped metrics that all
// share the same Desc, but have different values for their variable
// labels. This is used if you want to count the same thing partitioned by
// various dimensions. Create instances with NewUntypedVec.
//
// Deprecated: UntypedVec is deprecated for the same reasons as Untyped.
type UntypedVec struct {
*metricVec
}
// NewUntypedVec creates a new UntypedVec based on the provided UntypedOpts and
// partitioned by the given label names.
func NewUntypedVec(opts UntypedOpts, labelNames []string) *UntypedVec {
desc := NewDesc(
BuildFQName(opts.Namespace, opts.Subsystem, opts.Name),
opts.Help,
labelNames,
opts.ConstLabels,
)
return &UntypedVec{
metricVec: newMetricVec(desc, func(lvs ...string) Metric {
return newValue(desc, UntypedValue, 0, lvs...)
}),
}
}
// GetMetricWithLabelValues returns the Untyped for the given slice of label
// values (same order as the VariableLabels in Desc). If that combination of
// label values is accessed for the first time, a new Untyped is created.
//
// It is possible to call this method without using the returned Untyped to only
// create the new Untyped but leave it at its starting value 0. See also the
// SummaryVec example.
//
// Keeping the Untyped for later use is possible (and should be considered if
// performance is critical), but keep in mind that Reset, DeleteLabelValues and
// Delete can be used to delete the Untyped from the UntypedVec. In that case, the
// Untyped will still exist, but it will not be exported anymore, even if a
// Untyped with the same label values is created later. See also the CounterVec
// example.
//
// An error is returned if the number of label values is not the same as the
// number of VariableLabels in Desc.
//
// Note that for more than one label value, this method is prone to mistakes
// caused by an incorrect order of arguments. Consider GetMetricWith(Labels) as
// an alternative to avoid that type of mistake. For higher label numbers, the
// latter has a much more readable (albeit more verbose) syntax, but it comes
// with a performance overhead (for creating and processing the Labels map).
// See also the GaugeVec example.
func (m *UntypedVec) GetMetricWithLabelValues(lvs ...string) (Untyped, error) {
metric, err := m.metricVec.getMetricWithLabelValues(lvs...)
if metric != nil {
return metric.(Untyped), err
}
return nil, err
}
// GetMetricWith returns the Untyped for the given Labels map (the label names
// must match those of the VariableLabels in Desc). If that label map is
// accessed for the first time, a new Untyped is created. Implications of
// creating a Untyped without using it and keeping the Untyped for later use are
// the same as for GetMetricWithLabelValues.
//
// An error is returned if the number and names of the Labels are inconsistent
// with those of the VariableLabels in Desc.
//
// This method is used for the same purpose as
// GetMetricWithLabelValues(...string). See there for pros and cons of the two
// methods.
func (m *UntypedVec) GetMetricWith(labels Labels) (Untyped, error) {
metric, err := m.metricVec.getMetricWith(labels)
if metric != nil {
return metric.(Untyped), err
}
return nil, err
}
// WithLabelValues works as GetMetricWithLabelValues, but panics where
// GetMetricWithLabelValues would have returned an error. By not returning an
// error, WithLabelValues allows shortcuts like
// myVec.WithLabelValues("404", "GET").Add(42)
func (m *UntypedVec) WithLabelValues(lvs ...string) Untyped {
return m.metricVec.withLabelValues(lvs...).(Untyped)
}
// With works as GetMetricWith, but panics where GetMetricWithLabels would have
// returned an error. By not returning an error, With allows shortcuts like
// myVec.With(Labels{"code": "404", "method": "GET"}).Add(42)
func (m *UntypedVec) With(labels Labels) Untyped {
return m.metricVec.with(labels).(Untyped)
}
// UntypedFunc is an Untyped whose value is determined at collect time by
// calling a provided function.
// UntypedFunc works like GaugeFunc but the collected metric is of type
// "Untyped". UntypedFunc is useful to mirror an external metric of unknown
// type.
//
// To create UntypedFunc instances, use NewUntypedFunc.
type UntypedFunc interface {

50
prometheus/vec_test.go
View File

@ -21,8 +21,8 @@ import (
)
func TestDelete(t *testing.T) {
vec := NewUntypedVec(
UntypedOpts{
vec := NewGaugeVec(
GaugeOpts{
Name: "test",
Help: "helpless",
},
@ -32,8 +32,8 @@ func TestDelete(t *testing.T) {
}
func TestDeleteWithCollisions(t *testing.T) {
vec := NewUntypedVec(
UntypedOpts{
vec := NewGaugeVec(
GaugeOpts{
Name: "test",
Help: "helpless",
},
@ -44,12 +44,12 @@ func TestDeleteWithCollisions(t *testing.T) {
testDelete(t, vec)
}
func testDelete(t *testing.T, vec *UntypedVec) {
func testDelete(t *testing.T, vec *GaugeVec) {
if got, want := vec.Delete(Labels{"l1": "v1", "l2": "v2"}), false; got != want {
t.Errorf("got %v, want %v", got, want)
}
vec.With(Labels{"l1": "v1", "l2": "v2"}).(Untyped).Set(42)
vec.With(Labels{"l1": "v1", "l2": "v2"}).(Gauge).Set(42)
if got, want := vec.Delete(Labels{"l1": "v1", "l2": "v2"}), true; got != want {
t.Errorf("got %v, want %v", got, want)
}
@ -57,7 +57,7 @@ func testDelete(t *testing.T, vec *UntypedVec) {
t.Errorf("got %v, want %v", got, want)
}
vec.With(Labels{"l1": "v1", "l2": "v2"}).(Untyped).Set(42)
vec.With(Labels{"l1": "v1", "l2": "v2"}).(Gauge).Set(42)
if got, want := vec.Delete(Labels{"l2": "v2", "l1": "v1"}), true; got != want {
t.Errorf("got %v, want %v", got, want)
}
@ -65,7 +65,7 @@ func testDelete(t *testing.T, vec *UntypedVec) {
t.Errorf("got %v, want %v", got, want)
}
vec.With(Labels{"l1": "v1", "l2": "v2"}).(Untyped).Set(42)
vec.With(Labels{"l1": "v1", "l2": "v2"}).(Gauge).Set(42)
if got, want := vec.Delete(Labels{"l2": "v1", "l1": "v2"}), false; got != want {
t.Errorf("got %v, want %v", got, want)
}
@ -75,8 +75,8 @@ func testDelete(t *testing.T, vec *UntypedVec) {
}
func TestDeleteLabelValues(t *testing.T) {
vec := NewUntypedVec(
UntypedOpts{
vec := NewGaugeVec(
GaugeOpts{
Name: "test",
Help: "helpless",
},
@ -86,8 +86,8 @@ func TestDeleteLabelValues(t *testing.T) {
}
func TestDeleteLabelValuesWithCollisions(t *testing.T) {
vec := NewUntypedVec(
UntypedOpts{
vec := NewGaugeVec(
GaugeOpts{
Name: "test",
Help: "helpless",
},
@ -98,13 +98,13 @@ func TestDeleteLabelValuesWithCollisions(t *testing.T) {
testDeleteLabelValues(t, vec)
}
func testDeleteLabelValues(t *testing.T, vec *UntypedVec) {
func testDeleteLabelValues(t *testing.T, vec *GaugeVec) {
if got, want := vec.DeleteLabelValues("v1", "v2"), false; got != want {
t.Errorf("got %v, want %v", got, want)
}
vec.With(Labels{"l1": "v1", "l2": "v2"}).(Untyped).Set(42)
vec.With(Labels{"l1": "v1", "l2": "v3"}).(Untyped).Set(42) // Add junk data for collision.
vec.With(Labels{"l1": "v1", "l2": "v2"}).(Gauge).Set(42)
vec.With(Labels{"l1": "v1", "l2": "v3"}).(Gauge).Set(42) // Add junk data for collision.
if got, want := vec.DeleteLabelValues("v1", "v2"), true; got != want {
t.Errorf("got %v, want %v", got, want)
}
@ -115,7 +115,7 @@ func testDeleteLabelValues(t *testing.T, vec *UntypedVec) {
t.Errorf("got %v, want %v", got, want)
}
vec.With(Labels{"l1": "v1", "l2": "v2"}).(Untyped).Set(42)
vec.With(Labels{"l1": "v1", "l2": "v2"}).(Gauge).Set(42)
// Delete out of order.
if got, want := vec.DeleteLabelValues("v2", "v1"), false; got != want {
t.Errorf("got %v, want %v", got, want)
@ -126,8 +126,8 @@ func testDeleteLabelValues(t *testing.T, vec *UntypedVec) {
}
func TestMetricVec(t *testing.T) {
vec := NewUntypedVec(
UntypedOpts{
vec := NewGaugeVec(
GaugeOpts{
Name: "test",
Help: "helpless",
},
@ -137,8 +137,8 @@ func TestMetricVec(t *testing.T) {
}
func TestMetricVecWithCollisions(t *testing.T) {
vec := NewUntypedVec(
UntypedOpts{
vec := NewGaugeVec(
GaugeOpts{
Name: "test",
Help: "helpless",
},
@ -149,7 +149,7 @@ func TestMetricVecWithCollisions(t *testing.T) {
testMetricVec(t, vec)
}
func testMetricVec(t *testing.T, vec *UntypedVec) {
func testMetricVec(t *testing.T, vec *GaugeVec) {
vec.Reset() // Actually test Reset now!
var pair [2]string
@ -162,7 +162,7 @@ func testMetricVec(t *testing.T, vec *UntypedVec) {
vec.WithLabelValues(pair[0], pair[1]).Inc()
expected[[2]string{"v1", "v2"}]++
vec.WithLabelValues("v1", "v2").(Untyped).Inc()
vec.WithLabelValues("v1", "v2").(Gauge).Inc()
}
var total int
@ -175,7 +175,7 @@ func testMetricVec(t *testing.T, vec *UntypedVec) {
if err := metric.metric.Write(&metricOut); err != nil {
t.Fatal(err)
}
actual := *metricOut.Untyped.Value
actual := *metricOut.Gauge.Value
var actualPair [2]string
for i, label := range metricOut.Label {
@ -290,8 +290,8 @@ func benchmarkMetricVecWithLabelValues(b *testing.B, labels map[string][]string)
}
values := make([]string, len(labels)) // Value cache for permutations.
vec := NewUntypedVec(
UntypedOpts{
vec := NewGaugeVec(
GaugeOpts{
Name: "test",
Help: "helpless",
},