297 lines
6.5 KiB
Go
297 lines
6.5 KiB
Go
package main
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import (
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"context"
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"embed"
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"fmt"
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"io/fs"
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"log"
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"net"
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"net/http"
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"os"
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os_signal "os/signal"
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"strings"
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"syscall"
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"time"
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"git.exozy.me/exozyme/status/core"
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"git.exozy.me/exozyme/status/scanner"
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"github.com/cbroglie/mustache"
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"github.com/timewasted/go-accept-headers"
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)
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//go:embed all:public
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var staticAssets embed.FS
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//go:embed all:templates
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var templateAssets embed.FS
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func parseAndRenderTemplate(templateName string, data interface{}) (string, error) {
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rawTemplate, err := templateAssets.ReadFile(templateName)
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if err != nil {
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return "", err
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}
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tmpl, err := mustache.ParseString(string(rawTemplate))
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if err != nil {
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log.Println("Failed to parse template:", err)
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return "", err
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}
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res, err := tmpl.Render(data)
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if err != nil {
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log.Println("Failed to render template:", err)
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return "", err
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}
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return res, nil
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}
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func index(w http.ResponseWriter, r *http.Request) {
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if r.Method != "GET" {
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return
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}
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config_new, err := core.LoadConfig()
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if err != nil {
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log.Println("[WARN] failed to load config:", err)
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} else {
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config = config_new
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}
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// get service status'
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timeout := time.Second
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ctx, cancel := context.WithTimeout(context.Background(), timeout)
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defer cancel()
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data := scanner.CheckServiceBatch(ctx, config.Service)
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non_duplicates, err := dbm.StoreServiceStatusBatch(data, time.Now())
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if err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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err_annouce := announce(non_duplicates)
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if err_annouce != nil {
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log.Println(err_annouce)
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}
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// don't uncomment this in production. verbose
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// log.Printf("%v", data)
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ua := r.UserAgent()
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prefer_text := strings.HasPrefix(ua, "curl/")
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header_accept := accept.Parse(r.Header.Get("Accept"))
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accept_text := header_accept.Accepts("text/plain")
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accept_html := header_accept.Accepts("text/html")
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if (!accept_html || prefer_text) && accept_text {
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indexForVT100(w, r, data)
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} else if accept_html {
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indexForBrowser(w, r, data)
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} else { // when no valid content type is requested
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// not to-spec. still sends plain text anyway
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indexForVT100(w, r, data)
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}
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}
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func indexForVT100(w http.ResponseWriter, r *http.Request, data scanner.ServiceStatusBatch) {
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w.Header().Add("Content-Type", "text/plain; charset=utf-8")
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parsedTemplate := formatStatusUpdateAsText(data)
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w.Write([]byte(parsedTemplate))
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}
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func indexForBrowser(w http.ResponseWriter, r *http.Request, data scanner.ServiceStatusBatch) {
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parsedTemplate, err := parseAndRenderTemplate("templates/index.html", data)
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if err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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w.Write([]byte(parsedTemplate))
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}
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var config *core.Config
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var dbm core.Database
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var client *core.MatrixClient
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func cleanup() {
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log.Println("Cleaning up")
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_ = dbm.StoreSelfStatus(core.EventSelfDown, time.Now())
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_ = dbm.Persist()
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}
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func main() {
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var err error
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config, err = core.LoadConfig()
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if err != nil {
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log.Panic(err)
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}
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dbm, err = core.OpenDatabase(config.Database)
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if err != nil {
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log.Panic(err)
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}
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client, err = core.NewMatrixClient(config.Matrix)
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if err != nil {
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log.Panic(err)
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}
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http.HandleFunc("/", index)
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// serve public folder from embedfs
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htmlContent, err := fs.Sub(fs.FS(staticAssets), "public")
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if err != nil {
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log.Panic(err)
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}
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fs := http.FileServer(http.FS(htmlContent))
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http.Handle("/public/", http.StripPrefix("/public/", fs))
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protocol := "tcp"
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addr := "localhost:3333"
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var unix_socket_path string
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var is_unix bool
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if config.UnixSocket != "" {
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// get unix socket path from the config else
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unix_socket_path = config.UnixSocket
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is_unix = true
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} else {
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// fallback
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unix_socket_path, is_unix = os.LookupEnv("PORT")
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}
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if is_unix {
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protocol = "unix"
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addr = unix_socket_path
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// VnPower: is this unsafe?
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removeFile(addr) // ideally this should be run at program exit. sadly Go's defer doesn't care about signals or panic
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}
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srv := &http.Server{Addr: addr, Handler: nil}
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ln, err := net.Listen(protocol, addr)
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if err != nil {
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log.Panic(err)
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}
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if is_unix {
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err = os.Chmod(addr, 0660)
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if err != nil {
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log.Panic(err)
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}
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log.Printf("Listening on %v\n", addr)
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} else {
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log.Printf("Listening on http://%v/\n", addr)
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}
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// log startup and register cleanup (on SIGTERM or panic)
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ch_sigterm := make(chan os.Signal, 1)
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os_signal.Notify(ch_sigterm, syscall.SIGTERM, syscall.SIGINT)
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log.Print("Starting up")
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err = dbm.StoreSelfStatus(core.EventSelfUp, time.Now())
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if err != nil {
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log.Panic(err)
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}
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defer cleanup()
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go func() {
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<-ch_sigterm
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err := srv.Shutdown(context.Background())
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if err != nil {
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log.Printf("Error when shutting down: %v", err)
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}
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}()
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btime, err := core.GetBootTime()
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if err != nil {
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log.Printf("Error in core.GetBootTime: %v", err)
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} else {
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time_passed := time.Now().Sub(btime)
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time.Sleep(core.WaitDurationAfterBoot - time_passed)
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}
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go func() { // timed update
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for {
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err := routineCheck(5*time.Minute)
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if err != nil {
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log.Printf("Error in routineCheck: %v", err)
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// idea: maybe we should delay here
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}
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}
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}()
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err = srv.Serve(ln) // serve http
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if err != http.ErrServerClosed {
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log.Panic(err)
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}
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}
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func routineCheck(timeout time.Duration) error {
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ctx, cancel := context.WithTimeout(context.Background(), timeout)
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defer cancel()
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data := scanner.CheckServiceBatch(ctx, config.Service)
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non_duplicates, err := dbm.StoreServiceStatusBatch(data, time.Now())
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if err != nil {
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return err
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}
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err = announce(non_duplicates)
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if err != nil {
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return err
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}
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// log.Printf("Routine check: %v", data)
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<-ctx.Done()
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return nil
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}
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func formatStatusUpdateAsText(updates []scanner.ServiceStatus) string {
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result := ""
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for _, v := range updates {
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var upOrDown string
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if v.Ok {
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upOrDown = "UP"
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} else {
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upOrDown = "DOWN"
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}
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serviceType := fmt.Sprintf("[%s]", v.Type)
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result += fmt.Sprintf("%-4s | %-24s %-7s %s\n", upOrDown, v.Name, serviceType, v.Status)
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}
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return result
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}
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var first_time_to_annouce = true
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func announce(updates []scanner.ServiceStatus) error {
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messageBody := ""
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if first_time_to_annouce { // only show downed services
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tmp := []scanner.ServiceStatus{}
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num_omitted := 0
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for _, v := range updates {
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if !v.Ok {
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tmp = append(tmp, v)
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} else {
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num_omitted += 1
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}
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}
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updates = tmp
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messageBody += fmt.Sprintf("UP | (%d services omitted)\n", num_omitted)
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}
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if len(updates) == 0 {
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return nil
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}
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if first_time_to_annouce {
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first_time_to_annouce = false
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}
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messageBody += formatStatusUpdateAsText(updates)
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_, err := client.SendNoticeHTML(
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"```\n"+messageBody+"```",
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"<pre><code>"+strings.TrimRight(messageBody, "\n")+"</code></pre>", &updates)
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log.Printf("notify: err=%v\n%v", err, updates)
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return err
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}
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