kyle
4372673184
Default GET /metrics is Prometheus text; JSON stays at /metrics.json and ?format=json. :8443 needs the metrics caller bearer; loopback stays open. Restricted callers have no per-caller series and no tavily:restricted gauge.
109 lines
3.9 KiB
Go
109 lines
3.9 KiB
Go
// Copyright 2022 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 promhttp
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import (
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"context"
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"net/http"
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"github.com/prometheus/client_golang/prometheus"
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)
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// Option are used to configure both handler (middleware) or round tripper.
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type Option interface {
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apply(*options)
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}
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// LabelValueFromRequest is used to compute the label value from request.
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type LabelValueFromRequest func(request *http.Request) string
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// LabelValueFromCtx are used to compute the label value from request context.
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// Context can be filled with values from request through middleware.
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type LabelValueFromCtx func(ctx context.Context) string
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// options store options for both a handler or round tripper.
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type options struct {
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extraMethods []string
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getExemplarFn func(req *http.Request) prometheus.Labels
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extraLabelsFromRequest map[string]LabelValueFromRequest
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}
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func defaultOptions() *options {
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return &options{
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getExemplarFn: func(req *http.Request) prometheus.Labels { return nil },
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extraLabelsFromRequest: map[string]LabelValueFromRequest{},
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}
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}
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func (o *options) emptyDynamicLabels() prometheus.Labels {
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labels := prometheus.Labels{}
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for label := range o.extraLabelsFromRequest {
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labels[label] = ""
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}
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return labels
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}
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type optionApplyFunc func(*options)
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func (o optionApplyFunc) apply(opt *options) { o(opt) }
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// WithExtraMethods adds additional HTTP methods to the list of allowed methods.
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// See https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods for the default list.
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//
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// See the example for ExampleInstrumentHandlerWithExtraMethods for example usage.
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func WithExtraMethods(methods ...string) Option {
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return optionApplyFunc(func(o *options) {
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o.extraMethods = methods
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})
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}
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// WithExemplarFromRequest allows you to inject a function that will get exemplar from request that will be put to counter and histogram metrics.
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// If the function returns nil labels or the metric does not support exemplars, no exemplar will be added (noop), but
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// metric will continue to observe/increment.
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func WithExemplarFromRequest(getExemplarFn func(req *http.Request) prometheus.Labels) Option {
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return optionApplyFunc(func(o *options) {
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o.getExemplarFn = getExemplarFn
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})
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}
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// WithExemplarFromContext allows you to inject a function that will get exemplar from context that will be put to counter and histogram metrics.
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// If the function returns nil labels or the metric does not support exemplars, no exemplar will be added (noop), but
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// metric will continue to observe/increment.
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func WithExemplarFromContext(getExemplarFn func(requestCtx context.Context) prometheus.Labels) Option {
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return optionApplyFunc(func(o *options) {
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o.getExemplarFn = func(req *http.Request) prometheus.Labels {
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return getExemplarFn(req.Context())
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}
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})
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}
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// WithLabelFromRequest registers a label for dynamic resolution with access to the request.
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func WithLabelFromRequest(name string, valueFn LabelValueFromRequest) Option {
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return optionApplyFunc(func(o *options) {
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o.extraLabelsFromRequest[name] = valueFn
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})
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}
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// WithLabelFromCtx registers a label for dynamic resolution with access to context.
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// See the example for ExampleInstrumentHandlerWithLabelResolver for example usage
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func WithLabelFromCtx(name string, valueFn LabelValueFromCtx) Option {
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return optionApplyFunc(func(o *options) {
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o.extraLabelsFromRequest[name] = func(req *http.Request) string {
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return valueFn(req.Context())
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}
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})
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}
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