Provide Discriminator For Protocol Buf. Streams
This commit introduces an incomplete processor that decodes varint record length-delimited streams of io.prometheus.client.MetricFamily Protocol Buffer messages. The Go client presently does not support generation of said messages, but this will unblock a number of Java changes.
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@ -31,24 +31,34 @@ func ProcessorForRequestHeader(header http.Header) (Processor, error) {
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if err != nil {
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return nil, fmt.Errorf("Invalid Content-Type header %q: %s", header.Get("Content-Type"), err)
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}
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if mediatype != "application/json" {
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switch mediatype {
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case "application/vnd.google.protobuf":
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if params["proto"] != "io.prometheus.client.MetricFamily" {
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return nil, fmt.Errorf("Unrecognized Protocol Message %s", params["proto"])
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}
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if params["encoding"] != "varint record length-delimited" {
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return nil, fmt.Errorf("Unsupported Encoding %s", params["encoding"])
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}
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return MetricFamilyProcessor, nil
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case "application/json":
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var prometheusApiVersion string
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if params["schema"] == "prometheus/telemetry" && params["version"] != "" {
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prometheusApiVersion = params["version"]
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} else {
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prometheusApiVersion = header.Get("X-Prometheus-API-Version")
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}
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switch prometheusApiVersion {
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case "0.0.2":
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return Processor002, nil
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case "0.0.1":
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return Processor001, nil
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default:
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return nil, fmt.Errorf("Unrecognized API version %s", prometheusApiVersion)
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}
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default:
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return nil, fmt.Errorf("Unsupported media type %q, expected %q", mediatype, "application/json")
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}
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var prometheusApiVersion string
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if params["schema"] == "prometheus/telemetry" && params["version"] != "" {
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prometheusApiVersion = params["version"]
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} else {
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prometheusApiVersion = header.Get("X-Prometheus-API-Version")
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}
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switch prometheusApiVersion {
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case "0.0.2":
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return Processor002, nil
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case "0.0.1":
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return Processor001, nil
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default:
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return nil, fmt.Errorf("Unrecognized API version %s", prometheusApiVersion)
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}
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}
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@ -56,6 +56,21 @@ func testDiscriminatorHttpHeader(t test.Tester) {
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output: Processor002,
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err: nil,
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},
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{
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input: map[string]string{"Content-Type": `application/vnd.google.protobuf; proto="io.prometheus.client.MetricFamily"; encoding="varint record length-delimited"`},
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output: MetricFamilyProcessor,
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err: nil,
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},
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{
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input: map[string]string{"Content-Type": `application/vnd.google.protobuf; proto="illegal"; encoding="varint record length-delimited"`},
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output: nil,
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err: fmt.Errorf("Unrecognized Protocol Message illegal"),
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},
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{
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input: map[string]string{"Content-Type": `application/vnd.google.protobuf; proto="io.prometheus.client.MetricFamily"; encoding="illegal"`},
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output: nil,
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err: fmt.Errorf("Unsupported Encoding illegal"),
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},
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}
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for i, scenario := range scenarios {
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@ -0,0 +1,31 @@
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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 extraction
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import (
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"io"
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)
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type metricFamilyProcessor struct{}
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// MetricFamilyProcessor decodes varint encoded record length-delimited streams
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// of io.prometheus.client.MetricFamily.
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//
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// See http://godoc.org/github.com/matttproud/golang_protobuf_extensions/ext for
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// more details.
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var MetricFamilyProcessor = new(metricFamilyProcessor)
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func (m *metricFamilyProcessor) ProcessSingle(io.Reader, chan<- *Result, *ProcessOptions) error {
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panic("not implemented")
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}
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@ -23,7 +23,7 @@ import (
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// Processor002 is responsible for decoding payloads from protocol version
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// 0.0.2.
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var Processor002 = &processor002{}
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var Processor002 = new(processor002)
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type histogram002 struct {
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Labels map[string]string `json:"labels"`
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