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main.go
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main.go
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package main
import (
"bytes"
"errors"
"flag"
"fmt"
"io/ioutil"
"log"
"net"
"os"
"path"
"runtime"
"strconv"
"strings"
"sync"
"github.com/mholt/caddy/config"
"github.com/mholt/caddy/server"
)
var (
conf string
http2 bool // TODO: temporary flag until http2 is standard
quiet bool
cpu string
)
func init() {
flag.StringVar(&conf, "conf", "", "Configuration file to use (default="+config.DefaultConfigFile+")")
flag.BoolVar(&http2, "http2", true, "Enable HTTP/2 support") // TODO: temporary flag until http2 merged into std lib
flag.BoolVar(&quiet, "quiet", false, "Quiet mode (no initialization output)")
flag.StringVar(&cpu, "cpu", "100%", "CPU cap")
flag.StringVar(&config.Root, "root", config.DefaultRoot, "Root path to default site")
flag.StringVar(&config.Host, "host", config.DefaultHost, "Default host")
flag.StringVar(&config.Port, "port", config.DefaultPort, "Default port")
config.AppName = "Caddy"
config.AppVersion = "0.6.0"
}
func main() {
flag.Parse()
var wg sync.WaitGroup
// Set CPU cap
err := setCPU(cpu)
if err != nil {
log.Fatal(err)
}
// Load config from file
allConfigs, err := loadConfigs()
if err != nil {
log.Fatal(err)
}
// Group by address (virtual hosts)
addresses, err := arrangeBindings(allConfigs)
if err != nil {
log.Fatal(err)
}
// Start each server with its one or more configurations
for addr, configs := range addresses {
s, err := server.New(addr, configs, configs[0].TLS.Enabled)
if err != nil {
log.Fatal(err)
}
s.HTTP2 = http2 // TODO: This setting is temporary
wg.Add(1)
go func(s *server.Server) {
defer wg.Done()
err := s.Serve()
if err != nil {
log.Fatal(err) // kill whole process to avoid a half-alive zombie server
}
}(s)
if !quiet {
for _, config := range configs {
fmt.Println(config.Address())
}
}
}
wg.Wait()
}
// loadConfigs loads configuration from a file or stdin (piped).
// Configuration is obtained from one of three sources, tried
// in this order: 1. -conf flag, 2. stdin, 3. Caddyfile.
// If none of those are available, a default configuration is
// loaded.
func loadConfigs() ([]server.Config, error) {
// -conf flag
if conf != "" {
file, err := os.Open(conf)
if err != nil {
return []server.Config{}, err
}
defer file.Close()
return config.Load(path.Base(conf), file)
}
// stdin
fi, err := os.Stdin.Stat()
if err == nil && fi.Mode()&os.ModeCharDevice == 0 {
// Note that a non-nil error is not a problem. Windows
// will not create a stdin if there is no pipe, which
// produces an error when calling Stat(). But Unix will
// make one either way, which is why we also check that
// bitmask.
confBody, err := ioutil.ReadAll(os.Stdin)
if err != nil {
log.Fatal(err)
}
if len(confBody) > 0 {
return config.Load("stdin", bytes.NewReader(confBody))
}
}
// Caddyfile
file, err := os.Open(config.DefaultConfigFile)
if err != nil {
if os.IsNotExist(err) {
return []server.Config{config.Default()}, nil
}
return []server.Config{}, err
}
defer file.Close()
return config.Load(config.DefaultConfigFile, file)
}
// arrangeBindings groups configurations by their bind address. For example,
// a server that should listen on localhost and another on 127.0.0.1 will
// be grouped into the same address: 127.0.0.1. It will return an error
// if the address lookup fails or if a TLS listener is configured on the
// same address as a plaintext HTTP listener.
func arrangeBindings(allConfigs []server.Config) (map[string][]server.Config, error) {
addresses := make(map[string][]server.Config)
// Group configs by bind address
for _, conf := range allConfigs {
addr, err := net.ResolveTCPAddr("tcp", conf.Address())
if err != nil {
return addresses, errors.New("Could not serve " + conf.Address() + " - " + err.Error())
}
addresses[addr.String()] = append(addresses[addr.String()], conf)
}
// Don't allow HTTP and HTTPS to be served on the same address
for _, configs := range addresses {
isTLS := configs[0].TLS.Enabled
for _, config := range configs {
if config.TLS.Enabled != isTLS {
thisConfigProto, otherConfigProto := "HTTP", "HTTP"
if config.TLS.Enabled {
thisConfigProto = "HTTPS"
}
if configs[0].TLS.Enabled {
otherConfigProto = "HTTPS"
}
return addresses, fmt.Errorf("Configuration error: Cannot multiplex %s (%s) and %s (%s) on same address",
configs[0].Address(), otherConfigProto, config.Address(), thisConfigProto)
}
}
}
return addresses, nil
}
// setCPU parses string cpu and sets GOMAXPROCS
// according to its value. It accepts either
// a number (e.g. 3) or a percent (e.g. 50%).
func setCPU(cpu string) error {
var numCPU int
availCPU := runtime.NumCPU()
if strings.HasSuffix(cpu, "%") {
// Percent
var percent float32
pctStr := cpu[:len(cpu)-1]
pctInt, err := strconv.Atoi(pctStr)
if err != nil || pctInt < 1 || pctInt > 100 {
return errors.New("Invalid CPU value: percentage must be between 1-100")
}
percent = float32(pctInt) / 100
numCPU = int(float32(availCPU) * percent)
} else {
// Number
num, err := strconv.Atoi(cpu)
if err != nil || num < 1 {
return errors.New("Invalid CPU value: provide a number or percent greater than 0")
}
numCPU = num
}
if numCPU > availCPU {
numCPU = availCPU
}
runtime.GOMAXPROCS(numCPU)
return nil
}