mirror of
https://github.com/kubernetes-sigs/prometheus-adapter.git
synced 2026-04-06 01:38:10 +00:00
a293b2bf94
Travis seems to be having issues pulling deps, so we'll have to check in the vendor directory and prevent the makefile from trying to regenerate it normally.
88 lines
2.5 KiB
Go
88 lines
2.5 KiB
Go
// Copyright 2015 The Prometheus 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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//
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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 expfmt
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import (
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"fmt"
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"io"
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"net/http"
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"github.com/golang/protobuf/proto"
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"github.com/matttproud/golang_protobuf_extensions/pbutil"
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"github.com/prometheus/common/internal/bitbucket.org/ww/goautoneg"
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dto "github.com/prometheus/client_model/go"
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)
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// Encoder types encode metric families into an underlying wire protocol.
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type Encoder interface {
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Encode(*dto.MetricFamily) error
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}
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type encoder func(*dto.MetricFamily) error
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func (e encoder) Encode(v *dto.MetricFamily) error {
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return e(v)
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}
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// Negotiate returns the Content-Type based on the given Accept header.
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// If no appropriate accepted type is found, FmtText is returned.
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func Negotiate(h http.Header) Format {
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for _, ac := range goautoneg.ParseAccept(h.Get(hdrAccept)) {
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// Check for protocol buffer
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if ac.Type+"/"+ac.SubType == ProtoType && ac.Params["proto"] == ProtoProtocol {
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switch ac.Params["encoding"] {
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case "delimited":
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return FmtProtoDelim
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case "text":
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return FmtProtoText
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case "compact-text":
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return FmtProtoCompact
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}
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}
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// Check for text format.
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ver := ac.Params["version"]
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if ac.Type == "text" && ac.SubType == "plain" && (ver == TextVersion || ver == "") {
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return FmtText
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}
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}
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return FmtText
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}
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// NewEncoder returns a new encoder based on content type negotiation.
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func NewEncoder(w io.Writer, format Format) Encoder {
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switch format {
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case FmtProtoDelim:
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return encoder(func(v *dto.MetricFamily) error {
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_, err := pbutil.WriteDelimited(w, v)
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return err
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})
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case FmtProtoCompact:
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return encoder(func(v *dto.MetricFamily) error {
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_, err := fmt.Fprintln(w, v.String())
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return err
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})
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case FmtProtoText:
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return encoder(func(v *dto.MetricFamily) error {
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_, err := fmt.Fprintln(w, proto.MarshalTextString(v))
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return err
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})
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case FmtText:
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return encoder(func(v *dto.MetricFamily) error {
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_, err := MetricFamilyToText(w, v)
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return err
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})
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}
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panic("expfmt.NewEncoder: unknown format")
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}
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