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routes.go
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routes.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
package api
import (
"fmt"
"net/http"
_ "net/http/pprof" //nolint:gosec // we want to expose pprof endpoint
"net/url"
"github.com/elastic/elastic-agent-libs/config"
"github.com/elastic/elastic-agent-libs/logp"
"github.com/elastic/elastic-agent-libs/mapstr"
"github.com/elastic/elastic-agent-libs/monitoring"
)
// HandlerFunc is an http callback
type HandlerFunc func(http.ResponseWriter, *http.Request)
type lookupFunc func(string) *monitoring.Namespace
var handlerFuncMap = make(map[string]HandlerFunc)
// NewWithDefaultRoutes creates a new server with default API routes.
func NewWithDefaultRoutes(log *logp.Logger, c *config.C, ns lookupFunc) (*Server, error) {
mux := http.NewServeMux()
mux.HandleFunc("/", MakeRootAPIHandler(MakeAPIHandler(ns("info"))))
mux.HandleFunc("/state", MakeAPIHandler(ns("state")))
mux.HandleFunc("/stats", MakeAPIHandler(ns("stats")))
mux.HandleFunc("/dataset", MakeAPIHandler(ns("dataset")))
for api, h := range handlerFuncMap {
mux.HandleFunc(api, h)
}
return New(log, mux, c)
}
// AttachPprof adds /debug/pprof endpoints to the server
func (s *Server) AttachPprof() {
s.log.Info("Attaching pprof endpoints")
s.mux.HandleFunc("/debug/pprof/", func(w http.ResponseWriter, r *http.Request) {
http.DefaultServeMux.ServeHTTP(w, r)
})
}
// MakeRootAPIHandler creates a HandlerFunc for the root / path
func MakeRootAPIHandler(handler HandlerFunc) HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
handler(w, r)
}
}
// MakeAPIHandler creates an API handler for the given namespace
func MakeAPIHandler(ns *monitoring.Namespace) HandlerFunc {
return func(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
data := monitoring.CollectStructSnapshot(
ns.GetRegistry(),
monitoring.Full,
false,
)
prettyPrint(w, data, r.URL)
}
}
func prettyPrint(w http.ResponseWriter, data mapstr.M, u *url.URL) {
query := u.Query()
if _, ok := query["pretty"]; ok {
fmt.Fprint(w, data.StringToPrint())
} else {
fmt.Fprint(w, data.String())
}
}
// AddHandlerFunc adds a handler to the global handler map.
// Callbacks should be added before calling NewWithDefaultRoutes()
// This is NOT threadsafe
func AddHandlerFunc(api string, h HandlerFunc) error {
if _, exist := handlerFuncMap[api]; exist {
return fmt.Errorf("%s already exist", api)
}
handlerFuncMap[api] = h
return nil
}