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main.go
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main.go
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package main
import (
"context"
"errors"
"expvar"
"flag"
"fmt"
"log/slog"
"net"
"net/http"
"net/http/pprof"
"os"
"os/signal"
"path/filepath"
"runtime"
"runtime/debug"
"slices"
"strings"
"syscall"
"time"
_ "time/tzdata"
"github.com/polyscone/tofu/size"
"github.com/polyscone/tofu/slogger"
"github.com/polyscone/tofu/web"
)
var opts struct {
version bool
dev bool
data string
log struct {
style slogger.Style
}
server struct {
addr Addr
insecure bool
proxies Proxies
}
debug struct {
addr Addr
}
password struct {
duration time.Duration
memory int
parallelism int
}
}
func main() {
defer func() {
// If we recover from a panic we want to log it using whatever
// handler was setup as the default in the slog package, rather than
// just having the stack trace dumped without any structure
if err := recover(); err != nil {
const size = 64 << 10
buf := make([]byte, size)
buf = buf[:runtime.Stack(buf, false)]
message := fmt.Errorf("%v\n%s", err, buf)
slog.Error("panic", "error", message)
os.Exit(1)
}
}()
requiredFlags := []string{"addr"}
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), "Usage of %v:\n", os.Args[0])
fmt.Fprintf(flag.CommandLine.Output(), " %v [command] [-dev] [-addr <addr>] [-log-style <text|json|dev>]\n", os.Args[0])
fmt.Fprintln(flag.CommandLine.Output(), "Commands:")
fmt.Fprintf(flag.CommandLine.Output(), " version\n")
fmt.Fprintf(flag.CommandLine.Output(), " \tDisplay binary version information\n")
fmt.Fprintln(flag.CommandLine.Output(), "Options:")
flag.PrintDefaults()
}
flag.StringVar(&opts.data, "data", "./.data", "The directory to use for storing application data")
flag.BoolVar(&opts.dev, "dev", false, "Whether to run in development mode")
flag.BoolVar(&opts.version, "version", false, "Display binary version information")
flag.Var(&opts.log.style, "log-style", "The output style for log messages (text|json|dev)")
flag.Var(&opts.server.addr, "addr", "The address to run the server on, for example :8080; random if empty")
flag.BoolVar(&opts.server.insecure, "insecure", false, "Run in insecure mode without HTTPS")
flag.Var(&opts.server.proxies, "trusted-proxies", "A space separated list of trusted proxy addresses")
flag.Var(&opts.debug.addr, "debug-addr", "The address to run the private debug server on, for example :8081; random if empty")
flag.DurationVar(&opts.password.duration, "password-hash-duration", 1*time.Second, "The target duration of a password hash")
flag.IntVar(&opts.password.memory, "password-hash-memory", 64*size.Kibibyte, "The amount of memory (KiB) to use when hashing a password")
flag.IntVar(&opts.password.parallelism, "password-hash-parallelism", max(1, runtime.NumCPU()/2), "The number of threads to use when hashing a password")
flag.Parse()
if flag.NArg() > 0 && flag.Arg(0) != "version" {
fmt.Fprintf(flag.CommandLine.Output(), "Unknown command %q\n", flag.Arg(0))
flag.Usage()
os.Exit(2)
}
// Version data
{
modified := false
revision := "-"
tags := "-"
_go := strings.TrimPrefix(runtime.Version(), "go")
race := "disabled"
info, _ := debug.ReadBuildInfo()
for _, setting := range info.Settings {
switch setting.Key {
case "vcs.revision":
revision = setting.Value
case "vcs.modified":
modified = setting.Value == "true"
case "-tags":
tags = strings.ReplaceAll(setting.Value, ",", " ")
case "-race":
if setting.Value == "true" {
race = "enabled"
}
}
}
if modified {
revision += " (uncommitted changes)"
}
if opts.version || flag.Arg(0) == "version" {
var version string
version += fmt.Sprintln("Revision: ", revision)
version += fmt.Sprintln("Tags: ", tags)
version += fmt.Sprintln("Go version: ", _go)
version += fmt.Sprintln("OS/Arch: ", runtime.GOOS+"/"+runtime.GOARCH)
version += fmt.Sprintln("Race detector:", race)
fmt.Print(version)
return
}
newString := func(value string) expvar.Var {
var s expvar.String
s.Set(value)
return &s
}
version := expvar.NewMap("version")
version.Set("revision", newString(revision))
version.Set("tags", newString(tags))
version.Set("go", newString(_go))
version.Set("os", newString(runtime.GOOS))
version.Set("arch", newString(runtime.GOARCH))
version.Set("race", newString(race))
}
now := time.Now()
expvar.Publish("uptime", expvar.Func(func() any {
return time.Since(now)
}))
expvar.Publish("now", expvar.Func(func() any {
return time.Now()
}))
expvar.Publish("cgoCalls", expvar.Func(func() any {
return runtime.NumCgoCall()
}))
expvar.Publish("cpus", expvar.Func(func() any {
return runtime.NumCPU()
}))
expvar.Publish("goroutines", expvar.Func(func() any {
return runtime.NumGoroutine()
}))
if opts.log.style == "" {
opts.log.style = slogger.StyleJSON
}
handler, err := slogger.NewHandler(opts.log.style, nil)
if err != nil {
fmt.Println(err)
os.Exit(2)
}
logger, err := slogger.New(opts.log.style, nil)
if err != nil {
fmt.Println(err)
os.Exit(2)
}
slog.SetDefault(logger)
opts.server.addr.insecure = opts.server.insecure
opts.debug.addr.insecure = true
// Required flag checks
var requiredMessages []string
for _, name := range requiredFlags {
fail := func(name, value string, err error) {
// If err is nil here then it's most likely because we forced a call
// to fail on a required field that was left empty, but there was no
// custom error message, so we just set it to a default one in that case
if err == nil {
err = errors.New("required flag")
}
message := fmt.Sprintf("invalid value %q for flag -%v: %v", value, name, err)
requiredMessages = append(requiredMessages, message)
}
// If the provided value is an empty string then we force a call to the
// flag value's Set() method to get any custom error messages
// Since flags here are required this is ok because we expect Set() to
// be called at least once per flag anyway
// These checks will always fail with flags set using flag.Func
if f := flag.Lookup(name); f.Value.String() == "" {
fail(name, f.Value.String(), f.Value.Set(f.Value.String()))
}
}
if len(requiredMessages) > 0 {
fmt.Println(strings.Join(requiredMessages, "\n"))
flag.Usage()
os.Exit(2)
}
if err := os.MkdirAll(opts.data, 0755); err != nil {
slog.Error("make data directory", "error", err)
os.Exit(1)
}
// We always implicitly trust localhost
if ip := "::1"; !slices.Contains(opts.server.proxies, ip) {
opts.server.proxies = append(opts.server.proxies, ip)
}
if ip := "127.0.0.1"; !slices.Contains(opts.server.proxies, ip) {
opts.server.proxies = append(opts.server.proxies, ip)
}
if err := initHasher(); err != nil {
slog.Error("initialise hasher", "error", err)
os.Exit(1)
}
tenants := filepath.Join(opts.data, "tenants.json")
if err := initTenants(tenants); err != nil {
slog.Error("initialise tenants", "error", err)
}
listener, err := opts.server.addr.Listener()
if err != nil {
slog.Error("get listener", "error", err)
os.Exit(1)
}
baseCtx, baseCtxCancel := context.WithCancel(context.Background())
spill := 500 * time.Millisecond
readHeaderTimeout := 5 * time.Second
srv := http.Server{
ErrorLog: slog.NewLogLogger(handler, slog.LevelError),
Addr: opts.server.addr.value,
IdleTimeout: 1 * time.Minute,
ReadHeaderTimeout: readHeaderTimeout,
ReadTimeout: web.HandlerTimeout + readHeaderTimeout + spill,
WriteTimeout: web.HandlerTimeout + spill,
Handler: web.NewMultiTenantHandler(logger, newTenant),
BaseContext: func(_ net.Listener) context.Context {
return baseCtx
},
}
go func() {
slog.Info("listening", "addr", opts.server.addr.String(), "pid", os.Getpid())
if opts.server.addr.insecure {
err := srv.Serve(listener)
if err != nil && !errors.Is(err, http.ErrServerClosed) {
slog.Error("serve over HTTP", "error", err)
}
} else {
cert := filepath.Join(opts.data, "cert.pem")
key := filepath.Join(opts.data, "key.pem")
err := srv.ServeTLS(listener, cert, key)
if err != nil && !errors.Is(err, http.ErrServerClosed) {
slog.Error("serve over HTTPS", "error", err)
}
}
}()
if opts.debug.addr.value != "" {
go func() {
slog.Info("listening (debug)", "addr", opts.debug.addr.String(), "pid", os.Getpid())
mux := http.NewServeMux()
mux.HandleFunc("/debug/pprof/", pprof.Index)
mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
mux.Handle("/debug/vars", expvar.Handler())
if err := http.ListenAndServe(opts.debug.addr.value, mux); err != nil {
slog.Error("serve over HTTP (debug)", "error", err)
}
}()
}
stop := make(chan os.Signal, 1)
signal.Notify(stop, os.Interrupt, syscall.SIGTERM)
caught := <-stop
signal.Stop(stop)
slog.Info("shutting down", "signal", caught.String())
shutdownTimeout := 5 * time.Second
go func() {
time.Sleep(shutdownTimeout / 2)
baseCtxCancel()
}()
ctxShutdown, ctxShutdownCancel := context.WithTimeout(context.Background(), shutdownTimeout)
defer ctxShutdownCancel()
if err := srv.Shutdown(ctxShutdown); err != nil {
slog.Error("shut down", "error", err)
}
closeCache()
}