61 lines
1.7 KiB
Go
61 lines
1.7 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//go:build !nometrics
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package metrics
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import (
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"net/http"
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"github.com/gin-gonic/gin"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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)
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type Module struct {
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handler http.Handler
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}
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func New() *Module {
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// Let prometheus use "identity", ie., no compression,
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// or "gzip", to match our own gzip compression middleware.
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opts := promhttp.HandlerOpts{
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OfferedCompressions: []promhttp.Compression{
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promhttp.Identity,
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promhttp.Gzip,
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},
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}
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// Instrument handler itself.
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handler := promhttp.InstrumentMetricHandler(
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prometheus.DefaultRegisterer,
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promhttp.HandlerFor(prometheus.DefaultGatherer, opts),
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)
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return &Module{
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handler: handler,
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}
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}
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func (m *Module) Route(attachHandler func(method string, path string, f ...gin.HandlerFunc) gin.IRoutes) {
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attachHandler(http.MethodGet, "", func(c *gin.Context) {
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// Defer all "/metrics" handling to prom.
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m.handler.ServeHTTP(c.Writer, c.Request)
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})
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}
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