Alexander "Arav" Andreev
c7fe073623
Ditched JSON configuration file. Replaced with simple key = value format. Added indented_output option to format output with indent.
76 lines
1.8 KiB
Go
76 lines
1.8 KiB
Go
package main
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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, conf.IndentedOutput))
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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, indented bool) 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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pids, err := GetProcessPIDs(proc)
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proclist.AddProcess(proc, err == nil && len(pids) > 0)
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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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if indented {
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enc.Indent("", "\t")
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}
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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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if indented {
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enc.SetIndent("", "\t")
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}
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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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