91 lines
2.5 KiB
Go
91 lines
2.5 KiB
Go
/*
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httpprocwatchd provides HTTP interface to a list of process' statuses
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formatted as JSON.
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Copyright (c) 2021 Alexander "Arav" Andreev <me@arav.top>
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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 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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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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package prog
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import (
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"context"
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"encoding/json"
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"encoding/xml"
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"log"
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"net/http"
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"time"
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)
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func CreateAndStartHTTPServer(conf *Configuration) *http.Server {
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router := http.NewServeMux()
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router.HandleFunc("/processes", AreProcessesUp(&conf.Processes))
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srv := &http.Server{
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Addr: conf.ListenAddress,
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Handler: router,
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ReadTimeout: 5 * time.Second,
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WriteTimeout: 5 * time.Second,
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IdleTimeout: 10 * time.Second,
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}
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go func() {
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if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
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log.Fatalf("ListenAndServe: %s\n", err)
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}
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}()
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return srv
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}
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func ShutdownHTTPServer(srv *http.Server) {
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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srv.SetKeepAlivesEnabled(false)
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if err := srv.Shutdown(ctx); err != nil {
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log.Fatalf("%s\n", err)
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}
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}
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// AreProcessesUp handles a GET /processes request and sends back status of given
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// processes.
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func AreProcessesUp(processes *[]string) func(http.ResponseWriter, *http.Request) {
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return func(w http.ResponseWriter, r *http.Request) {
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if r.Method == http.MethodGet {
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proclist := NewProcessList()
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for _, proc := range *processes {
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isup, _, _ := IsProcessUp(proc)
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proclist.AddProcess(proc, isup)
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}
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if hdr := r.Header.Get("Accept"); hdr == "application/xml" {
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w.Header().Add("Content-Type", "application/xml")
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enc := xml.NewEncoder(w)
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enc.Indent("", "\t")
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enc.Encode(proclist)
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} else {
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w.Header().Add("Content-Type", "application/json")
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enc := json.NewEncoder(w)
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enc.SetIndent("", "\t")
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enc.Encode(proclist)
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}
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} else {
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w.WriteHeader(http.StatusMethodNotAllowed)
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w.Header().Add("Allow", "GET")
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}
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}
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}
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