client_golang was updated to support full label-oriented telemetry, which introduced interface incompatibilities with the previous version of Prometheus. To alleviate this, a general fetching and processing dispatching system has been created, which discriminates and processes according to the version of input.pull/48/head
parent
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// Copyright 2013 Prometheus Team
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package format |
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import ( |
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"fmt" |
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"net/http" |
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) |
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var ( |
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DefaultRegistry Registry = ®istry{} |
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) |
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// Registry is responsible for applying a determination strategy to the given
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// inputs to determine what Processor can handle this type of input.
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type Registry interface { |
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// ProcessorForRequestHeader interprets a HTTP request header to determine
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// what Processor should be used for the given input.
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ProcessorForRequestHeader(header http.Header) (Processor, error) |
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} |
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type registry struct { |
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} |
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func (r *registry) ProcessorForRequestHeader(header http.Header) (processor Processor, err error) { |
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if header == nil { |
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err = fmt.Errorf("Received illegal and nil header.") |
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return |
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} |
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prometheusApiVersion := header.Get("X-Prometheus-API-Version") |
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switch prometheusApiVersion { |
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case "0.0.1": |
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processor = Processor001 |
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return |
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default: |
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err = fmt.Errorf("Unrecognized API version %s", prometheusApiVersion) |
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return |
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} |
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return |
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} |
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@ -0,0 +1,82 @@ |
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// Copyright 2013 Prometheus Team
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package format |
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import ( |
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"fmt" |
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"github.com/matttproud/prometheus/utility/test" |
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"net/http" |
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"testing" |
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) |
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func testDiscriminatorHttpHeader(t test.Tester) { |
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var scenarios = []struct { |
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input map[string]string |
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output Processor |
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err error |
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}{ |
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{ |
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output: nil, |
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err: fmt.Errorf("Received illegal and nil header."), |
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}, |
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{ |
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input: map[string]string{"X-Prometheus-API-Version": "0.0.0"}, |
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output: nil, |
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err: fmt.Errorf("Unrecognized API version 0.0.0"), |
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}, |
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{ |
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input: map[string]string{"X-Prometheus-API-Version": "0.0.1"}, |
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output: Processor001, |
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err: nil, |
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}, |
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} |
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for i, scenario := range scenarios { |
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var header http.Header |
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if len(scenario.input) > 0 { |
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header = http.Header{} |
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} |
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for key, value := range scenario.input { |
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header.Add(key, value) |
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} |
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actual, err := DefaultRegistry.ProcessorForRequestHeader(header) |
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if scenario.err != err { |
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if scenario.err != nil && err != nil { |
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if scenario.err.Error() != err.Error() { |
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t.Errorf("%d. expected %s, got %s", i, scenario.err, err) |
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} |
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} else if scenario.err != nil || err != nil { |
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t.Errorf("%d. expected %s, got %s", i, scenario.err, err) |
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} |
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} |
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if scenario.output != actual { |
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t.Errorf("%d. expected %s, got %s", i, scenario.output, actual) |
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} |
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} |
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} |
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func TestDiscriminatorHttpHeader(t *testing.T) { |
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testDiscriminatorHttpHeader(t) |
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} |
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func BenchmarkDiscriminatorHttpHeader(b *testing.B) { |
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for i := 0; i < b.N; i++ { |
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testDiscriminatorHttpHeader(b) |
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} |
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} |
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// Copyright 2013 Prometheus Team
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package format |
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import ( |
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"testing" |
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) |
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func TestInterface(t *testing.T) { |
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var _ Registry = ®istry{} |
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} |
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// Copyright 2013 Prometheus Team
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package format |
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import ( |
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"github.com/matttproud/prometheus/model" |
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"io" |
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) |
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// Processor is responsible for decoding the actual message responses from
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// stream into a format that can be consumed with the end result written
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// to the results channel.
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type Processor interface { |
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// Process performs the work on the input and closes the incoming stream.
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Process(stream io.ReadCloser, baseLabels model.LabelSet, results chan Result) (err error) |
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} |
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@ -0,0 +1,156 @@ |
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// Copyright 2013 Prometheus Team
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package format |
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import ( |
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"encoding/json" |
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"fmt" |
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"github.com/matttproud/prometheus/model" |
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"io" |
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"io/ioutil" |
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"time" |
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) |
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const ( |
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baseLabels001 = "baseLabels" |
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counter001 = "counter" |
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docstring001 = "docstring" |
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gauge001 = "gauge" |
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histogram001 = "histogram" |
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labels001 = "labels" |
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metric001 = "metric" |
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type001 = "type" |
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value001 = "value" |
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percentile001 = "percentile" |
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) |
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var ( |
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Processor001 Processor = &processor001{} |
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) |
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// processor001 is responsible for handling API version 0.0.1.
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type processor001 struct { |
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} |
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// entity001 represents a the JSON structure that 0.0.1 uses.
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type entity001 []struct { |
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BaseLabels map[string]string `json:"baseLabels"` |
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Docstring string `json:"docstring"` |
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Metric struct { |
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MetricType string `json:"type"` |
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Value []struct { |
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Labels map[string]string `json:"labels"` |
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Value interface{} `json:"value"` |
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} `json:"value"` |
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} `json:"metric"` |
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} |
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func (p *processor001) Process(stream io.ReadCloser, baseLabels model.LabelSet, results chan Result) (err error) { |
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// TODO(matt): Replace with plain-jane JSON unmarshalling.
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defer stream.Close() |
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buffer, err := ioutil.ReadAll(stream) |
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if err != nil { |
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return |
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} |
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entities := entity001{} |
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err = json.Unmarshal(buffer, &entities) |
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if err != nil { |
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return |
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} |
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// Swap this to the testable timer.
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now := time.Now() |
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// TODO(matt): This outer loop is a great basis for parallelization.
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for _, entity := range entities { |
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for _, value := range entity.Metric.Value { |
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metric := model.Metric{} |
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for label, labelValue := range baseLabels { |
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metric[label] = labelValue |
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} |
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for label, labelValue := range entity.BaseLabels { |
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metric[model.LabelName(label)] = model.LabelValue(labelValue) |
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} |
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for label, labelValue := range value.Labels { |
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metric[model.LabelName(label)] = model.LabelValue(labelValue) |
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} |
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switch entity.Metric.MetricType { |
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case gauge001, counter001: |
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sampleValue, ok := value.Value.(float64) |
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if !ok { |
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err = fmt.Errorf("Could not convert value from %s %s to float64.", entity, value) |
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continue |
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} |
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sample := model.Sample{ |
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Metric: metric, |
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Timestamp: now, |
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Value: model.SampleValue(sampleValue), |
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} |
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results <- Result{ |
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Err: err, |
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Sample: sample, |
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} |
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break |
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case histogram001: |
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sampleValue, ok := value.Value.(map[string]interface{}) |
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if !ok { |
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err = fmt.Errorf("Could not convert value from %q to a map[string]interface{}.", value.Value) |
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continue |
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} |
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for percentile, percentileValue := range sampleValue { |
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individualValue, ok := percentileValue.(float64) |
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if !ok { |
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err = fmt.Errorf("Could not convert value from %q to a float64.", percentileValue) |
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continue |
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} |
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childMetric := make(map[model.LabelName]model.LabelValue, len(metric)+1) |
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for k, v := range metric { |
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childMetric[k] = v |
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} |
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childMetric[model.LabelName(percentile001)] = model.LabelValue(percentile) |
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sample := model.Sample{ |
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Metric: childMetric, |
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Timestamp: now, |
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Value: model.SampleValue(individualValue), |
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} |
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results <- Result{ |
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Err: err, |
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Sample: sample, |
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} |
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} |
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break |
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default: |
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} |
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} |
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} |
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|
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return |
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} |
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@ -0,0 +1,262 @@ |
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// Copyright 2013 Prometheus Team
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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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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 format |
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|
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import ( |
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"container/list" |
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"fmt" |
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"github.com/matttproud/prometheus/model" |
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"github.com/matttproud/prometheus/utility/test" |
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"io/ioutil" |
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"strings" |
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"testing" |
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) |
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|
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func testProcessor001Process(t test.Tester) { |
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var scenarios = []struct { |
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in string |
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out []Result |
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err error |
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}{ |
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{ |
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err: fmt.Errorf("unexpected end of JSON input"), |
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}, |
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{ |
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in: "[{\"baseLabels\":{\"name\":\"rpc_calls_total\"},\"docstring\":\"RPC calls.\",\"metric\":{\"type\":\"counter\",\"value\":[{\"labels\":{\"service\":\"zed\"},\"value\":25},{\"labels\":{\"service\":\"bar\"},\"value\":25},{\"labels\":{\"service\":\"foo\"},\"value\":25}]}},{\"baseLabels\":{\"name\":\"rpc_latency_microseconds\"},\"docstring\":\"RPC latency.\",\"metric\":{\"type\":\"histogram\",\"value\":[{\"labels\":{\"service\":\"foo\"},\"value\":{\"0.010000\":15.890724674774395,\"0.050000\":15.890724674774395,\"0.500000\":84.63044031436561,\"0.900000\":160.21100853053224,\"0.990000\":172.49828748957728}},{\"labels\":{\"service\":\"zed\"},\"value\":{\"0.010000\":0.0459814091918713,\"0.050000\":0.0459814091918713,\"0.500000\":0.6120456642749681,\"0.900000\":1.355915069887731,\"0.990000\":1.772733213161236}},{\"labels\":{\"service\":\"bar\"},\"value\":{\"0.010000\":78.48563317257356,\"0.050000\":78.48563317257356,\"0.500000\":97.31798360385088,\"0.900000\":109.89202084295582,\"0.990000\":109.99626121011262}}]}}]", |
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out: []Result{ |
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{ |
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Sample: model.Sample{ |
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Metric: model.Metric{"service": "zed", "name": "rpc_calls_total"}, |
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Value: 25, |
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}, |
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}, |
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{ |
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Sample: model.Sample{ |
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Metric: model.Metric{"service": "bar", "name": "rpc_calls_total"}, |
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Value: 25, |
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}, |
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}, |
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{ |
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Sample: model.Sample{ |
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|
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Metric: model.Metric{"service": "foo", "name": "rpc_calls_total"}, |
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Value: 25, |
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}, |
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}, |
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{ |
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Sample: model.Sample{ |
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|
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Metric: model.Metric{"percentile": "0.010000", "name": "rpc_latency_microseconds", "service": "zed"}, |
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Value: 0.04598141, |
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}, |
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}, |
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{ |
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Sample: model.Sample{ |
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|
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Metric: model.Metric{"percentile": "0.010000", "name": "rpc_latency_microseconds", "service": "bar"}, |
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Value: 78.485634, |
||||
}, |
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}, |
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{ |
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Sample: model.Sample{ |
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|
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Metric: model.Metric{"percentile": "0.010000", "name": "rpc_latency_microseconds", "service": "foo"}, |
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Value: 15.890724674774395, |
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}, |
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}, |
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{ |
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Sample: model.Sample{ |
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|
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Metric: model.Metric{"percentile": "0.050000", "name": "rpc_latency_microseconds", "service": "zed"}, |
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Value: 0.04598141, |
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}, |
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}, |
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{ |
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Sample: model.Sample{ |
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|
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Metric: model.Metric{"percentile": "0.050000", "name": "rpc_latency_microseconds", "service": "bar"}, |
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Value: 78.485634, |
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}, |
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}, |
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{ |
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Sample: model.Sample{ |
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|
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Metric: model.Metric{"percentile": "0.050000", "name": "rpc_latency_microseconds", "service": "foo"}, |
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Value: 15.890724674774395, |
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}, |
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}, |
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{ |
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Sample: model.Sample{ |
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|
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Metric: model.Metric{"percentile": "0.500000", "name": "rpc_latency_microseconds", "service": "zed"}, |
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Value: 0.61204565, |
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}, |
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}, |
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{ |
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Sample: model.Sample{ |
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|
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Metric: model.Metric{"percentile": "0.500000", "name": "rpc_latency_microseconds", "service": "bar"}, |
||||
Value: 97.317986, |
||||
}, |
||||
}, |
||||
{ |
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Sample: model.Sample{ |
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|
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Metric: model.Metric{"percentile": "0.500000", "name": "rpc_latency_microseconds", "service": "foo"}, |
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Value: 84.63044, |
||||
}, |
||||
}, |
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{ |
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Sample: model.Sample{ |
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|
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Metric: model.Metric{"percentile": "0.900000", "name": "rpc_latency_microseconds", "service": "zed"}, |
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Value: 1.3559151, |
||||
}, |
||||
}, |
||||
{ |
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Sample: model.Sample{ |
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|
||||
Metric: model.Metric{"percentile": "0.900000", "name": "rpc_latency_microseconds", "service": "bar"}, |
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Value: 109.89202, |
||||
}, |
||||
}, |
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{ |
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Sample: model.Sample{ |
||||
|
||||
Metric: model.Metric{"percentile": "0.900000", "name": "rpc_latency_microseconds", "service": "foo"}, |
||||
Value: 160.21101, |
||||
}, |
||||
}, |
||||
{ |
||||
Sample: model.Sample{ |
||||
|
||||
Metric: model.Metric{"percentile": "0.990000", "name": "rpc_latency_microseconds", "service": "zed"}, |
||||
Value: 1.7727332, |
||||
}, |
||||
}, |
||||
{ |
||||
Sample: model.Sample{ |
||||
|
||||
Metric: model.Metric{"percentile": "0.990000", "name": "rpc_latency_microseconds", "service": "bar"}, |
||||
Value: 109.99626, |
||||
}, |
||||
}, |
||||
{ |
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Sample: model.Sample{ |
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|
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Metric: model.Metric{"percentile": "0.990000", "name": "rpc_latency_microseconds", "service": "foo"}, |
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Value: 172.49829, |
||||
}, |
||||
}, |
||||
}, |
||||
}, |
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} |
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|
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for i, scenario := range scenarios { |
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inputChannel := make(chan Result, 1024) |
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|
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defer func(c chan Result) { |
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close(c) |
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}(inputChannel) |
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|
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reader := strings.NewReader(scenario.in) |
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|
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err := Processor001.Process(ioutil.NopCloser(reader), model.LabelSet{}, inputChannel) |
||||
if !test.ErrorEqual(scenario.err, err) { |
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t.Errorf("%d. expected err of %s, got %s", i, scenario.err, err) |
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continue |
||||
} |
||||
|
||||
if scenario.err != nil && err != nil { |
||||
if scenario.err.Error() != err.Error() { |
||||
t.Errorf("%d. expected err of %s, got %s", i, scenario.err, err) |
||||
} |
||||
} else if scenario.err != err { |
||||
t.Errorf("%d. expected err of %s, got %s", i, scenario.err, err) |
||||
} |
||||
|
||||
delivered := make([]Result, 0) |
||||
|
||||
for len(inputChannel) != 0 { |
||||
delivered = append(delivered, <-inputChannel) |
||||
} |
||||
|
||||
if len(delivered) != len(scenario.out) { |
||||
t.Errorf("%d. expected output length of %d, got %d", i, len(scenario.out), len(delivered)) |
||||
|
||||
continue |
||||
} |
||||
|
||||
expectedElements := list.New() |
||||
for _, j := range scenario.out { |
||||
expectedElements.PushBack(j) |
||||
} |
||||
|
||||
for j := 0; j < len(delivered); j++ { |
||||
actual := delivered[j] |
||||
|
||||
found := false |
||||
for element := expectedElements.Front(); element != nil && found == false; element = element.Next() { |
||||
candidate := element.Value.(Result) |
||||
|
||||
if !test.ErrorEqual(candidate.Err, actual.Err) { |
||||
continue |
||||
} |
||||
|
||||
if candidate.Sample.Value != actual.Sample.Value { |
||||
continue |
||||
} |
||||
|
||||
if len(candidate.Sample.Metric) != len(actual.Sample.Metric) { |
||||
continue |
||||
} |
||||
|
||||
labelsMatch := false |
||||
|
||||
for key, value := range candidate.Sample.Metric { |
||||
actualValue, ok := actual.Sample.Metric[key] |
||||
if !ok { |
||||
break |
||||
} |
||||
if actualValue == value { |
||||
labelsMatch = true |
||||
break |
||||
} |
||||
} |
||||
|
||||
if !labelsMatch { |
||||
continue |
||||
} |
||||
|
||||
// XXX: Test time.
|
||||
found = true |
||||
expectedElements.Remove(element) |
||||
} |
||||
|
||||
if !found { |
||||
t.Errorf("%d.%d. expected to find %s among candidate, absent", i, j, actual.Sample) |
||||
} |
||||
} |
||||
} |
||||
} |
||||
|
||||
func TestProcessor001Process(t *testing.T) { |
||||
testProcessor001Process(t) |
||||
} |
||||
|
||||
func BenchmarkProcessor001Process(b *testing.B) { |
||||
for i := 0; i < b.N; i++ { |
||||
testProcessor001Process(b) |
||||
} |
||||
} |
||||
@ -0,0 +1,25 @@ |
||||
// Copyright 2013 Prometheus Team
|
||||
// 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.
|
||||
|
||||
package format |
||||
|
||||
import ( |
||||
"github.com/matttproud/prometheus/model" |
||||
) |
||||
|
||||
// Result encapsulates the outcome from processing a given sample from a
|
||||
// source.
|
||||
type Result struct { |
||||
Err error |
||||
Sample model.Sample |
||||
} |
||||
@ -0,0 +1,31 @@ |
||||
// Copyright 2013 Prometheus Team
|
||||
// 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.
|
||||
|
||||
package test |
||||
|
||||
// ErrorEqual compares Go errors for equality.
|
||||
func ErrorEqual(left, right error) bool { |
||||
if left == right { |
||||
return true |
||||
} |
||||
|
||||
if left != nil && right != nil { |
||||
if left.Error() == right.Error() { |
||||
return true |
||||
} |
||||
|
||||
return false |
||||
} |
||||
|
||||
return false |
||||
} |
||||
Loading…
Reference in new issue