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41f5dd56e1
* Add per host config * Pass host label when option is enabled * Test per host enabled * metrics: scope metrics per loaded config * doc and linter Signed-off-by: Mohammed Al Sahaf <msaa1990@gmail.com> * inject the custom registry into the admin handler Co-Authored-By: Dave Henderson <dhenderson@gmail.com> * remove `TODO` comment * fixes Signed-off-by: Mohammed Al Sahaf <msaa1990@gmail.com> * refactor to delay metrics admin handler provision Signed-off-by: Mohammed Al Sahaf <msaa1990@gmail.com> --------- Signed-off-by: Mohammed Al Sahaf <msaa1990@gmail.com> Co-authored-by: Hussam Almarzooq <me@hussam.io> Co-authored-by: Dave Henderson <dhenderson@gmail.com>
74 lines
2.1 KiB
Go
74 lines
2.1 KiB
Go
// Copyright 2020 Matthew Holt and The Caddy Authors
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//
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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 metrics
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import (
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"errors"
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"net/http"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/caddyserver/caddy/v2"
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)
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func init() {
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caddy.RegisterModule(AdminMetrics{})
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}
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// AdminMetrics is a module that serves a metrics endpoint so that any gathered
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// metrics can be exposed for scraping. This module is not configurable, and
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// is permanently mounted to the admin API endpoint at "/metrics".
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// See the Metrics module for a configurable endpoint that is usable if the
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// Admin API is disabled.
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type AdminMetrics struct {
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registry *prometheus.Registry
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metricsHandler http.Handler
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}
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// CaddyModule returns the Caddy module information.
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func (AdminMetrics) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "admin.api.metrics",
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New: func() caddy.Module { return new(AdminMetrics) },
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}
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}
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// Provision -
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func (m *AdminMetrics) Provision(ctx caddy.Context) error {
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m.registry = ctx.GetMetricsRegistry()
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if m.registry == nil {
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return errors.New("no metrics registry found")
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}
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m.metricsHandler = createMetricsHandler(nil, false, m.registry)
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return nil
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}
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// Routes returns a route for the /metrics endpoint.
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func (m *AdminMetrics) Routes() []caddy.AdminRoute {
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return []caddy.AdminRoute{{Pattern: "/metrics", Handler: caddy.AdminHandlerFunc(m.serveHTTP)}}
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}
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func (m *AdminMetrics) serveHTTP(w http.ResponseWriter, r *http.Request) error {
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m.metricsHandler.ServeHTTP(w, r)
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return nil
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}
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// Interface guards
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var (
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_ caddy.Provisioner = (*AdminMetrics)(nil)
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_ caddy.AdminRouter = (*AdminMetrics)(nil)
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)
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