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carbon-app.go
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carbon-app.go
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package main
//go:generate make glue/generated_glue.go
import (
"bufio"
"errors"
"flag"
"fmt"
"log"
"net/http"
"os"
"path/filepath"
"runtime"
"strconv"
"time"
"./glue"
"github.com/DeedleFake/Go-PhysicsFS/physfs"
"github.com/carbonsrv/carbon/modules/luaconf"
"github.com/carbonsrv/carbon/modules/middleware"
"github.com/carbonsrv/carbon/modules/scheduler"
"github.com/gin-gonic/gin"
"github.com/pmylund/go-cache"
"github.com/vifino/golua/lua"
"github.com/vifino/luar"
"golang.org/x/net/http2"
)
// General
var jobs *int
// Cache
var cfe *cache.Cache
var kvstore *cache.Cache
func cacheRead(c *cache.Cache, file string) (string, error) {
res := ""
data_tmp, found := c.Get(file)
if found == false {
data, err := fileRead(file)
if err != nil {
return "", err
}
c.Set(file, data, cache.DefaultExpiration)
} else {
debug("Using cache for %s" + file)
res = data_tmp.(string)
}
return res, nil
}
// File system functions
var filesystem http.FileSystem
func initPhysFS(path string) http.FileSystem {
err := physfs.Init()
if err != nil {
panic(err)
}
err = physfs.Mount(path, "/root", true)
if err != nil {
panic(err)
}
return physfs.FileSystem()
}
/*func fileExists(file string) bool {
if _, err := os.Stat(file); os.IsNotExist(err) {
return false
}
return true
}*/
func fileRead(file string) (string, error) {
file = "/root" + file
if physfs.Exists(file) {
f, err := filesystem.Open(file)
defer f.Close()
if err != nil {
return "", err
}
fi, err := f.Stat()
if err != nil {
return "", err
}
r := bufio.NewReader(f)
buf := make([]byte, fi.Size())
_, err = r.Read(buf)
if err != nil {
return "", err
}
return string(buf), err
}
return "", errors.New("no such file or directory.")
}
func fileExists(file string) bool {
return physfs.Exists("/root" + file)
}
func cacheFileExists(file string) bool {
file = "/root" + file
data_tmp, found := cfe.Get(file)
if found == false {
exists := fileExists(file)
cfe.Set(file, exists, cache.DefaultExpiration)
return exists
} else {
return data_tmp.(bool)
}
}
// Logging
var doLog bool = false
func debug(str string) {
if doLog {
log.Print(str)
}
}
// Server
func new_server() *gin.Engine {
return gin.New()
}
func serve(srv http.Handler, en_http bool, en_https bool, en_http2 bool, bind string, binds string, cert string, key string) {
end := make(chan bool)
if en_http {
go serveHTTP(srv, bind, en_http2)
}
if en_https {
cert, _ := filepath.Abs(cert)
key, _ := filepath.Abs(key)
go serveHTTPS(srv, binds, en_http2, cert, key)
}
<-end
}
func serveHTTP(srv http.Handler, bind string, en_http2 bool) {
s := &http.Server{
Addr: bind,
Handler: srv,
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
MaxHeaderBytes: 1 << 20,
}
if en_http2 {
http2.ConfigureServer(s, nil)
}
err := s.ListenAndServe()
if err != nil {
panic(err)
}
}
func serveHTTPS(srv http.Handler, bind string, en_http2 bool, cert string, key string) {
s := &http.Server{
Addr: bind,
Handler: srv,
ReadTimeout: 10 * time.Second,
WriteTimeout: 10 * time.Second,
MaxHeaderBytes: 1 << 20,
}
if en_http2 {
http2.ConfigureServer(s, nil)
}
err := s.ListenAndServeTLS(cert, key)
if err != nil {
panic(err)
}
}
func assert(err error) {
if err != nil {
panic(err)
}
}
// Helper for environment
func int_from_env(key string, def int) int {
var num = def
tmp := os.Getenv(key)
if tmp != "" {
num, err := strconv.Atoi(tmp)
assert(err)
return num // to make go happy
}
return num
}
func bool_from_env(key string, def bool) bool {
var boolean = def
tmp := os.Getenv(key)
if tmp != "" {
boolean, err := strconv.ParseBool(tmp)
assert(err)
return boolean // to make go happy
}
return boolean
}
func string_from_env(key string, def string) string {
var str = def
tmp := os.Getenv(key)
if tmp != "" {
str = tmp
}
return str
}
// bindhook is the hook that registers our stuff
func bindhook(L *lua.State) {
luar.Register(L, "carbon", luar.Map{
"appdata": glue.GetGlue,
})
L.DoString(`
local cache_key_prefix = "carbon:lua_module:"
local cache_key_app = cache_key_prefix .. "app:"
local cache_key_app_location = cache_key_prefix .. "app_location:"
-- Load from compiled in app
local function loadapp(name)
local modname = tostring(name):gsub("%.", "/")
local location = modname .. ".lua"
local src = carbon.appdata(location)
if src ~= "" then
-- Compile and return the module
local f, err = loadstring(src, location)
if err then error(err, 0) end
kvstore._set(cache_key_app..modname, string.dump(f))
kvstore._set(cache_key_app_location..modname, location)
return f
end
local location_init = modname .. "/init.lua"
local src = carbon.appdata(location_init)
if src ~= "" then
-- Compile and return the module
local f, err = loadstring(src, location)
if err then error(err, 0) end
kvstore._set(cache_key_app..modname, string.dump(f))
kvstore._set(cache_key_app_location..modname, location_init)
return f
end
return "\n\tno app asset '/" .. location .. "' (not compiled in)"..
"\n\tno app asset '/" .. location_init .. "' (not compiled in)"
end
table.insert(package.loaders, 3, loadapp)
`)
}
func main() {
cfe = cache.New(5*time.Minute, 30*time.Second) // File-Exists Cache
kvstore = cache.New(-1, -1) // Key-Value Storage
var host = os.Getenv("CARBON_HOST")
var port = int_from_env("CARBON_PORT", 80)
var ports = int_from_env("CARBON_PORTS", 443)
var cert = os.Getenv("CARBON_CERT")
var key = os.Getenv("CARBON_KEY")
var en_http = bool_from_env("CARBON_ENABLE_HTTP", true)
var en_https = bool_from_env("CARBON_ENABLE_HTTPS", false)
var en_http2 = bool_from_env("CARBON_ENABLE_HTTP2", false)
wrkrs := 2
if runtime.NumCPU() > 2 {
wrkrs = runtime.NumCPU()
}
jobs := int_from_env("CARBON_STATES", wrkrs)
var workers = int_from_env("CARBON_WORKERS", wrkrs)
var webroot = string_from_env("CARBON_ROOT", ".")
// Do debug!
doDebug := bool_from_env("CARBON_DEBUG", false)
// Middleware options
useRecovery := bool_from_env("CARBON_RECOVERY", false)
useLogger := bool_from_env("CARBON_LOGGER", true)
args := os.Args
if en_https {
if key == "" || cert == "" {
panic("Need to have a Key and a Cert defined.")
}
}
runtime.GOMAXPROCS(workers)
root, _ := filepath.Abs(webroot)
physroot_path := root
filesystem = initPhysFS(physroot_path)
defer physfs.Deinit()
go scheduler.Run() // Run the scheduler.
go middleware.Preloader() // Run the Preloader.
middleware.Init(jobs, cfe, kvstore, root) // Run init sequence.
if doDebug == false {
gin.SetMode(gin.ReleaseMode)
}
if useLogger {
doLog = true
}
if flag.Arg(1) == "" {
args = make([]string, 0)
} else {
args = args[1:]
}
script_src, err := glue.GetGlue("app.lua")
if err != nil {
script_src, err = glue.GetGlue("init.lua")
if err != nil {
fmt.Println("Error: Compiled Bundle does not contain 'app.lua' or 'init.lua'. No idea what to run. Aborting.")
os.Exit(1)
}
}
L := luaconf.Setup(args, cfe, webroot, useRecovery, useLogger, false, func(srv *gin.Engine) {
serve(srv, en_http, en_https, en_http2, host+":"+strconv.Itoa(port), host+":"+strconv.Itoa(ports), cert, key)
}, bindhook)
err = L.DoString(script_src)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
L.Close()
}