mirror of
https://github.com/caddyserver/caddy.git
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123 lines
3.2 KiB
Go
123 lines
3.2 KiB
Go
// Copyright 2015 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 reverseproxy
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import (
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"encoding/json"
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"fmt"
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"net/http"
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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(adminUpstreams{})
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}
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// adminUpstreams is a module that provides the
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// /reverse_proxy/upstreams endpoint for the Caddy admin
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// API. This allows for checking the health of configured
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// reverse proxy upstreams in the pool.
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type adminUpstreams struct{}
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// upstreamResults holds the status of a particular upstream
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type upstreamStatus struct {
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Address string `json:"address"`
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Healthy bool `json:"healthy"`
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NumRequests int `json:"num_requests"`
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Fails int `json:"fails"`
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}
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// CaddyModule returns the Caddy module information.
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func (adminUpstreams) CaddyModule() caddy.ModuleInfo {
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return caddy.ModuleInfo{
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ID: "admin.api.reverse_proxy",
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New: func() caddy.Module { return new(adminUpstreams) },
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}
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}
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// Routes returns a route for the /reverse_proxy/upstreams endpoint.
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func (al adminUpstreams) Routes() []caddy.AdminRoute {
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return []caddy.AdminRoute{
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{
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Pattern: "/reverse_proxy/upstreams",
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Handler: caddy.AdminHandlerFunc(al.handleUpstreams),
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},
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}
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}
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// handleUpstreams reports the status of the reverse proxy
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// upstream pool.
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func (adminUpstreams) handleUpstreams(w http.ResponseWriter, r *http.Request) error {
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if r.Method != http.MethodGet {
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return caddy.APIError{
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HTTPStatus: http.StatusMethodNotAllowed,
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Err: fmt.Errorf("method not allowed"),
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}
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}
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// Prep for a JSON response
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w.Header().Set("Content-Type", "application/json")
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enc := json.NewEncoder(w)
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// Collect the results to respond with
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results := []upstreamStatus{}
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// Iterate over the upstream pool (needs to be fast)
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var rangeErr error
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hosts.Range(func(key, val interface{}) bool {
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address, ok := key.(string)
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if !ok {
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rangeErr = caddy.APIError{
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HTTPStatus: http.StatusInternalServerError,
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Err: fmt.Errorf("could not type assert upstream address"),
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}
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return false
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}
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upstream, ok := val.(*upstreamHost)
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if !ok {
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rangeErr = caddy.APIError{
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HTTPStatus: http.StatusInternalServerError,
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Err: fmt.Errorf("could not type assert upstream struct"),
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}
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return false
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}
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results = append(results, upstreamStatus{
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Address: address,
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Healthy: !upstream.Unhealthy(),
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NumRequests: upstream.NumRequests(),
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Fails: upstream.Fails(),
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})
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return true
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})
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// If an error happened during the range, return it
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if rangeErr != nil {
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return rangeErr
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}
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err := enc.Encode(results)
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if err != nil {
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return caddy.APIError{
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HTTPStatus: http.StatusInternalServerError,
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Err: err,
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}
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}
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return nil
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}
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