75 lines
2.4 KiB
Go
75 lines
2.4 KiB
Go
// 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 extraction
|
|
|
|
import (
|
|
"errors"
|
|
"fmt"
|
|
"mime"
|
|
"net/http"
|
|
)
|
|
|
|
// ProcessorForRequestHeader interprets a HTTP request header to determine
|
|
// what Processor should be used for the given input. If no acceptable
|
|
// Processor can be found, an error is returned.
|
|
func ProcessorForRequestHeader(header http.Header) (Processor, error) {
|
|
if header == nil {
|
|
return nil, errors.New("received illegal and nil header")
|
|
}
|
|
|
|
mediatype, params, err := mime.ParseMediaType(header.Get("Content-Type"))
|
|
if err != nil {
|
|
return nil, fmt.Errorf("invalid Content-Type header %q: %s", header.Get("Content-Type"), err)
|
|
}
|
|
switch mediatype {
|
|
case "application/vnd.google.protobuf":
|
|
if params["proto"] != "io.prometheus.client.MetricFamily" {
|
|
return nil, fmt.Errorf("unrecognized protocol message %s", params["proto"])
|
|
}
|
|
if params["encoding"] != "delimited" {
|
|
return nil, fmt.Errorf("unsupported encoding %s", params["encoding"])
|
|
}
|
|
return MetricFamilyProcessor, nil
|
|
case "text/plain":
|
|
switch params["version"] {
|
|
case "0.0.4":
|
|
return Processor004, nil
|
|
case "":
|
|
// Fallback: most recent version.
|
|
return Processor004, nil
|
|
default:
|
|
return nil, fmt.Errorf("unrecognized API version %s", params["version"])
|
|
}
|
|
case "application/json":
|
|
var prometheusAPIVersion string
|
|
|
|
if params["schema"] == "prometheus/telemetry" && params["version"] != "" {
|
|
prometheusAPIVersion = params["version"]
|
|
} else {
|
|
prometheusAPIVersion = header.Get("X-Prometheus-API-Version")
|
|
}
|
|
|
|
switch prometheusAPIVersion {
|
|
case "0.0.2":
|
|
return Processor002, nil
|
|
case "0.0.1":
|
|
return Processor001, nil
|
|
default:
|
|
return nil, fmt.Errorf("unrecognized API version %s", prometheusAPIVersion)
|
|
}
|
|
default:
|
|
return nil, fmt.Errorf("unsupported media type %q, expected %q", mediatype, "application/json")
|
|
}
|
|
}
|