forked from mirror/client_golang
75 lines
2.4 KiB
Go
75 lines
2.4 KiB
Go
// 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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"errors"
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"fmt"
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"mime"
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"net/http"
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)
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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. If no acceptable
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// Processor can be found, an error is returned.
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func ProcessorForRequestHeader(header http.Header) (Processor, error) {
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if header == nil {
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return nil, errors.New("received illegal and nil header")
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}
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mediatype, params, err := mime.ParseMediaType(header.Get("Content-Type"))
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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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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"] != "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 "text/plain":
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switch params["version"] {
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case "0.0.4":
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return Processor004, nil
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case "":
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// Fallback: most recent version.
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return Processor004, nil
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default:
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return nil, fmt.Errorf("unrecognized API version %s", params["version"])
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}
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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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}
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