go-latestver/main.go

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package main
import (
"fmt"
"net/http"
"os"
"time"
"github.com/gorilla/mux"
"github.com/robfig/cron/v3"
log "github.com/sirupsen/logrus"
"github.com/Luzifer/go-latestver/internal/config"
"github.com/Luzifer/go-latestver/internal/database"
httpHelper "github.com/Luzifer/go_helpers/v2/http"
"github.com/Luzifer/rconfig/v2"
)
var (
cfg = struct {
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BaseURL string `flag:"base-url" default:"https://example.com/" description:"Base-URL the application is reachable at"`
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Config string `flag:"config,c" default:"config.yaml" description:"Configuration file with catalog entries"`
Listen string `flag:"listen" default:":3000" description:"Port/IP to listen on"`
LogLevel string `flag:"log-level" default:"info" description:"Log level (debug, info, warn, error, fatal)"`
MaxJitter time.Duration `flag:"max-jitter" default:"30m" description:"Maximum jitter to add to the check interval for load balancing"`
Storage string `flag:"storage" default:"sqlite" description:"Storage adapter to use (mysql, sqlite)"`
StorageDSN string `flag:"storage-dsn" default:"file::memory:?cache=shared" description:"DSN to connect to the database"`
VersionAndExit bool `flag:"version" default:"false" description:"Prints current version and exits"`
}{}
configFile = config.New()
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router *mux.Router
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storage *database.Client
version = "dev"
)
func initApp() {
rconfig.AutoEnv(true)
if err := rconfig.ParseAndValidate(&cfg); err != nil {
log.Fatalf("Unable to parse commandline options: %s", err)
}
if cfg.VersionAndExit {
fmt.Printf("go-latestver %s\n", version)
os.Exit(0)
}
if l, err := log.ParseLevel(cfg.LogLevel); err != nil {
log.WithError(err).Fatal("Unable to parse log level")
} else {
log.SetLevel(l)
}
}
func main() {
initApp()
var err error
if err = configFile.Load(cfg.Config); err != nil {
log.WithError(err).Fatal("Unable to load configuration")
}
if err = configFile.ValidateCatalog(); err != nil {
log.WithError(err).Fatal("Configuration is not valid")
}
storage, err = database.NewClient(cfg.Storage, cfg.StorageDSN)
if err != nil {
log.WithError(err).Fatal("Unable to connect to database")
}
scheduler := cron.New()
scheduler.AddFunc("@every 1m", schedulerRun)
scheduler.Start()
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router = mux.NewRouter()
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router.HandleFunc("/v1/catalog", handleCatalogList).Methods(http.MethodGet)
router.HandleFunc("/v1/catalog/{name}/{tag}", handleCatalogGet).Methods(http.MethodGet)
router.HandleFunc("/v1/catalog/{name}/{tag}/log", handleLog).Methods(http.MethodGet)
router.HandleFunc("/v1/catalog/{name}/{tag}/version", handleCatalogGetVersion).Methods(http.MethodGet)
router.HandleFunc("/v1/log", handleLog).Methods(http.MethodGet)
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router.HandleFunc("/", nil).Methods(http.MethodGet).Name("catalog")
router.HandleFunc("/{name}/{tag}", nil).Methods(http.MethodGet).Name("catalog-entry")
router.HandleFunc("/{name}/{tag}/log.rss", handleLogFeed).Methods(http.MethodGet).Name("catalog-entry-rss")
router.HandleFunc("/log", nil).Methods(http.MethodGet)
router.HandleFunc("/log.rss", handleLogFeed).Methods(http.MethodGet).Name("log-rss")
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var handler http.Handler = router
handler = httpHelper.GzipHandler(handler)
handler = httpHelper.NewHTTPLogHandler(handler)
if err := http.ListenAndServe(cfg.Listen, handler); err != nil {
log.WithError(err).Fatal("HTTP server exited unclean")
}
}