253 lines
9.1 KiB
Go
253 lines
9.1 KiB
Go
/*
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Copyright 2017 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package value
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import (
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"bytes"
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"context"
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"fmt"
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"strings"
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"testing"
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"k8s.io/component-base/metrics/legacyregistry"
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"k8s.io/component-base/metrics/testutil"
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)
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type testTransformer struct {
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from, to []byte
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err error
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stale bool
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receivedFrom, receivedTo []byte
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}
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func (t *testTransformer) TransformFromStorage(ctx context.Context, data []byte, dataCtx Context) (out []byte, stale bool, err error) {
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t.receivedFrom = data
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return t.from, t.stale, t.err
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}
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func (t *testTransformer) TransformToStorage(ctx context.Context, data []byte, dataCtx Context) (out []byte, err error) {
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t.receivedTo = data
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return t.to, t.err
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}
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func TestPrefixFrom(t *testing.T) {
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testErr := fmt.Errorf("test error")
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transformErr := fmt.Errorf("transform error")
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transformers := []PrefixTransformer{
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{Prefix: []byte("first:"), Transformer: &testTransformer{from: []byte("value1")}},
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{Prefix: []byte("second:"), Transformer: &testTransformer{from: []byte("value2")}},
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{Prefix: []byte("fails:"), Transformer: &testTransformer{err: transformErr}},
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{Prefix: []byte("stale:"), Transformer: &testTransformer{from: []byte("value3"), stale: true}},
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}
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p := NewPrefixTransformers(testErr, transformers...)
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testCases := []struct {
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input []byte
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expect []byte
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stale bool
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err error
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match int
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}{
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{[]byte("first:value"), []byte("value1"), false, nil, 0},
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{[]byte("second:value"), []byte("value2"), true, nil, 1},
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{[]byte("third:value"), nil, false, testErr, -1},
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{[]byte("fails:value"), nil, false, transformErr, 2},
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{[]byte("stale:value"), []byte("value3"), true, nil, 3},
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}
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for i, test := range testCases {
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got, stale, err := p.TransformFromStorage(context.Background(), test.input, nil)
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if err != test.err || stale != test.stale || !bytes.Equal(got, test.expect) {
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t.Errorf("%d: unexpected out: %q %t %#v", i, string(got), stale, err)
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continue
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}
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if test.match != -1 && !bytes.Equal([]byte("value"), transformers[test.match].Transformer.(*testTransformer).receivedFrom) {
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t.Errorf("%d: unexpected value received by transformer: %s", i, transformers[test.match].Transformer.(*testTransformer).receivedFrom)
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}
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}
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}
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func TestPrefixTo(t *testing.T) {
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testErr := fmt.Errorf("test error")
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transformErr := fmt.Errorf("test error")
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testCases := []struct {
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transformers []PrefixTransformer
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expect []byte
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err error
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}{
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{[]PrefixTransformer{{Prefix: []byte("first:"), Transformer: &testTransformer{to: []byte("value1")}}}, []byte("first:value1"), nil},
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{[]PrefixTransformer{{Prefix: []byte("second:"), Transformer: &testTransformer{to: []byte("value2")}}}, []byte("second:value2"), nil},
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{[]PrefixTransformer{{Prefix: []byte("fails:"), Transformer: &testTransformer{err: transformErr}}}, nil, transformErr},
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}
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for i, test := range testCases {
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p := NewPrefixTransformers(testErr, test.transformers...)
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got, err := p.TransformToStorage(context.Background(), []byte("value"), nil)
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if err != test.err || !bytes.Equal(got, test.expect) {
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t.Errorf("%d: unexpected out: %q %#v", i, string(got), err)
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continue
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}
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if !bytes.Equal([]byte("value"), test.transformers[0].Transformer.(*testTransformer).receivedTo) {
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t.Errorf("%d: unexpected value received by transformer: %s", i, test.transformers[0].Transformer.(*testTransformer).receivedTo)
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}
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}
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}
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func TestPrefixFromMetrics(t *testing.T) {
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testErr := fmt.Errorf("test error")
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transformerErr := fmt.Errorf("test error")
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identityTransformer := PrefixTransformer{Prefix: []byte{}, Transformer: &testTransformer{from: []byte("value1")}}
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identityTransformerErr := PrefixTransformer{Prefix: []byte{}, Transformer: &testTransformer{err: transformerErr}}
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otherTransformer := PrefixTransformer{Prefix: []byte("other:"), Transformer: &testTransformer{from: []byte("value1")}}
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otherTransformerErr := PrefixTransformer{Prefix: []byte("other:"), Transformer: &testTransformer{err: transformerErr}}
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testCases := []struct {
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desc string
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input []byte
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prefix Transformer
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metrics []string
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want string
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err error
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}{
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{
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desc: "identity prefix",
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input: []byte("value"),
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prefix: NewPrefixTransformers(testErr, identityTransformer, otherTransformer),
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metrics: []string{
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"apiserver_storage_transformation_operations_total",
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},
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want: `
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# HELP apiserver_storage_transformation_operations_total [ALPHA] Total number of transformations.
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# TYPE apiserver_storage_transformation_operations_total counter
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apiserver_storage_transformation_operations_total{status="OK",transformation_type="from_storage",transformer_prefix="identity"} 1
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`,
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err: nil,
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},
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{
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desc: "other prefix (ok)",
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input: []byte("other:value"),
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prefix: NewPrefixTransformers(testErr, identityTransformerErr, otherTransformer),
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metrics: []string{
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"apiserver_storage_transformation_operations_total",
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},
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want: `
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# HELP apiserver_storage_transformation_operations_total [ALPHA] Total number of transformations.
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# TYPE apiserver_storage_transformation_operations_total counter
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apiserver_storage_transformation_operations_total{status="OK",transformation_type="from_storage",transformer_prefix="other:"} 1
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`,
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err: nil,
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},
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{
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desc: "other prefix (error)",
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input: []byte("other:value"),
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prefix: NewPrefixTransformers(testErr, identityTransformerErr, otherTransformerErr),
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metrics: []string{
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"apiserver_storage_transformation_operations_total",
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},
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want: `
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# HELP apiserver_storage_transformation_operations_total [ALPHA] Total number of transformations.
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# TYPE apiserver_storage_transformation_operations_total counter
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apiserver_storage_transformation_operations_total{status="unknown-non-grpc",transformation_type="from_storage",transformer_prefix="other:"} 1
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`,
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err: nil,
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},
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{
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desc: "unknown prefix",
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input: []byte("foo:value"),
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prefix: NewPrefixTransformers(testErr, identityTransformerErr, otherTransformer),
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metrics: []string{
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"apiserver_storage_transformation_operations_total",
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},
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want: `
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# HELP apiserver_storage_transformation_operations_total [ALPHA] Total number of transformations.
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# TYPE apiserver_storage_transformation_operations_total counter
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apiserver_storage_transformation_operations_total{status="unknown-non-grpc",transformation_type="from_storage",transformer_prefix="unknown"} 1
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`,
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err: nil,
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},
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}
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RegisterMetrics()
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transformerOperationsTotal.Reset()
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for _, tc := range testCases {
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t.Run(tc.desc, func(t *testing.T) {
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tc.prefix.TransformFromStorage(context.Background(), tc.input, nil)
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defer transformerOperationsTotal.Reset()
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if err := testutil.GatherAndCompare(legacyregistry.DefaultGatherer, strings.NewReader(tc.want), tc.metrics...); err != nil {
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t.Fatal(err)
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}
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})
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}
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}
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func TestPrefixToMetrics(t *testing.T) {
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testErr := fmt.Errorf("test error")
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transformerErr := fmt.Errorf("test error")
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otherTransformer := PrefixTransformer{Prefix: []byte("other:"), Transformer: &testTransformer{from: []byte("value1")}}
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otherTransformerErr := PrefixTransformer{Prefix: []byte("other:"), Transformer: &testTransformer{err: transformerErr}}
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testCases := []struct {
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desc string
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input []byte
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prefix Transformer
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metrics []string
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want string
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err error
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}{
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{
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desc: "ok",
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input: []byte("value"),
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prefix: NewPrefixTransformers(testErr, otherTransformer),
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metrics: []string{
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"apiserver_storage_transformation_operations_total",
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},
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want: `
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# HELP apiserver_storage_transformation_operations_total [ALPHA] Total number of transformations.
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# TYPE apiserver_storage_transformation_operations_total counter
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apiserver_storage_transformation_operations_total{status="OK",transformation_type="to_storage",transformer_prefix="other:"} 1
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`,
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err: nil,
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},
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{
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desc: "error",
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input: []byte("value"),
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prefix: NewPrefixTransformers(testErr, otherTransformerErr),
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metrics: []string{
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"apiserver_storage_transformation_operations_total",
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},
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want: `
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# HELP apiserver_storage_transformation_operations_total [ALPHA] Total number of transformations.
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# TYPE apiserver_storage_transformation_operations_total counter
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apiserver_storage_transformation_operations_total{status="unknown-non-grpc",transformation_type="to_storage",transformer_prefix="other:"} 1
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`,
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err: nil,
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},
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}
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RegisterMetrics()
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transformerOperationsTotal.Reset()
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for _, tc := range testCases {
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t.Run(tc.desc, func(t *testing.T) {
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tc.prefix.TransformToStorage(context.Background(), tc.input, nil)
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defer transformerOperationsTotal.Reset()
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if err := testutil.GatherAndCompare(legacyregistry.DefaultGatherer, strings.NewReader(tc.want), tc.metrics...); err != nil {
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t.Fatal(err)
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}
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})
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}
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}
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