forked from qrtz/livedev
/
server.go
384 lines (314 loc) · 6.9 KB
/
server.go
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package main
import (
"bufio"
"bytes"
"errors"
"fmt"
"go/build"
"log"
"net"
"net/http"
"os"
"os/exec"
"path/filepath"
"regexp"
"strconv"
"strings"
"sync"
"time"
)
var (
E_TIMEOUT = errors.New("Timeout:Gave up")
E_PROXY_ONLY = errors.New("proxy only")
)
type PortType uint8
const (
PROT_TYPE_STATIC = iota
PORT_TYPE_DYNAMIC
)
type Resource struct {
Ignore *regexp.Regexp
Paths []string
}
type Server struct {
addr string
bin string
builder []string
closed chan struct{}
cmd *exec.Cmd
context build.Context
dep []string
host string
lock sync.Mutex
port int
portType PortType
requestTime time.Time
resources *Resource
startup []string
startTime time.Time
state error
target string
targetDir string
tcpAddr *net.TCPAddr
}
func NewServer(context build.Context, s ServerConf) (*Server, error) {
var (
srv = new(Server)
ignore *regexp.Regexp
paths []string
)
if len(s.Resources.Paths) > 0 {
for _, s := range s.Resources.Paths {
if p := strings.TrimSpace(s); len(p) > 0 {
paths = append(paths, p)
}
}
if len(paths) > 0 {
if s := strings.TrimSpace(s.Resources.Ignore); len(s) > 0 {
if pattern, err := regexp.Compile(s); err == nil {
ignore = pattern
} else {
return nil, fmt.Errorf(`Fatal error: Invalid pattern "%s" : %v`, s, err)
}
}
srv.resources = &Resource{ignore, paths}
}
}
srv.target = strings.TrimSpace(s.Target)
srv.targetDir = filepath.Dir(s.Target)
srv.bin = strings.TrimSpace(s.Bin)
srv.builder = s.Builder
if !hasPrefix(srv.target, filepath.SplitList(context.GOPATH)) {
//Target is not in the $GOPATH
//Try to guess the import root(workspace) from the path
roots := ImportRoots(srv.target)
if len(roots) > 0 {
context.GOPATH = strings.Join(append(roots, context.GOPATH), string(filepath.ListSeparator))
}
}
srv.context = context
if len(srv.builder) == 0 {
cmd := filepath.Join(context.GOROOT, "bin", "go")
srv.builder = append(srv.builder, cmd, "build", "-o", srv.bin)
}
srv.port = s.Port
srv.startup = s.Startup
srv.host = s.Host
return srv, nil
}
func (srv *Server) wait(timeout <-chan time.Time) error {
var (
lastError error
)
url := fmt.Sprintf("http://%s/", srv.addr)
for {
select {
case <-timeout:
return E_TIMEOUT
default:
if srv.state != nil {
return srv.state
}
response, err := http.Head(url)
if err == nil {
if response != nil && response.Body != nil {
response.Body.Close()
}
return nil
}
lastError = err
time.Sleep(100 * time.Millisecond)
}
}
return lastError
}
func (srv *Server) Stop() (err error) {
if srv.cmd != nil && srv.cmd.Process != nil {
err = srv.cmd.Process.Kill()
if err == nil {
err = srv.cmd.Process.Release()
}
<-srv.closed
}
return
}
func (srv *Server) monitor() {
defer close(srv.closed)
if out, err := srv.cmd.CombinedOutput(); err != nil {
if len(out) > 0 {
srv.state = errors.New(string(out))
} else {
srv.state = err
}
}
srv.cmd = nil
}
func (srv *Server) Start() error {
if srv.cmd != nil {
log.Printf(`"%s" already started`, srv.host)
return nil
}
log.Printf("Starting...%s", srv.host)
args := srv.startup
if srv.port == 0 {
addr, err := findAvailablePort()
if err != nil {
return err
}
srv.tcpAddr = addr
srv.port = addr.Port
srv.portType = PORT_TYPE_DYNAMIC
}
if len(srv.addr) == 0 {
srv.addr = net.JoinHostPort(srv.host, strconv.Itoa(srv.port))
log.Println(srv.addr)
}
if srv.tcpAddr == nil {
a, err := net.ResolveTCPAddr("tcp", srv.addr)
if err != nil {
return err
}
srv.tcpAddr = a
}
if srv.portType == PORT_TYPE_DYNAMIC {
args = append(args, "--addr", srv.addr)
}
srv.state = nil
srv.cmd = exec.Command(srv.bin, args...)
srv.startTime = time.Now()
srv.closed = make(chan struct{})
go srv.monitor()
return srv.wait(time.After(30 * time.Second))
}
func (srv *Server) build() error {
log.Printf("Building...%s", srv.host)
//List of file to pass to "go build"
var buildFiles []string
for _, f := range srv.dep {
if strings.HasPrefix(f, srv.targetDir) {
buildFiles = append(buildFiles, filepath.Base(f))
}
}
//Reset the dependency list.
env := NewEnv(os.Environ())
env.Set(KEY_GOPATH, srv.context.GOPATH)
command, args := srv.builder[0], srv.builder[1:]
args = append(args, buildFiles...)
cmd := exec.Command(command, args...)
cmd.Env = env.Data()
cmd.Dir = srv.targetDir
if out, err := cmd.CombinedOutput(); err != nil {
if len(out) > 0 {
r := bufio.NewReader(bytes.NewReader(out))
var lines []string
done:
for {
line, err := r.ReadString('\n')
switch {
case err != nil:
break done
case !strings.HasPrefix(line, "#"):
lines = append(lines, line)
}
}
return errors.New(strings.Join(lines, ""))
}
return err
}
srv.dep = nil
return nil
}
func (srv *Server) BuildAndRun() error {
requestTime := time.Now()
srv.lock.Lock()
defer func() {
srv.requestTime = time.Now()
srv.lock.Unlock()
}()
if len(srv.bin) == 0 {
if srv.port == 0 {
srv.port = 80
}
if len(srv.addr) == 0 {
srv.addr = net.JoinHostPort(srv.host, strconv.Itoa(srv.port))
a, err := net.ResolveTCPAddr("tcp", srv.addr)
if err != nil {
return err
}
srv.tcpAddr = a
}
//PROXY ONLY
return nil
}
//Ignore if the request is within less than 3 seconds of the last one.
//This is an arbitrary number. We can certainly increase this.
if requestTime.Sub(srv.requestTime) < (3 * time.Second) {
return nil
}
var (
binModTime time.Time
restart = srv.cmd == nil
rebuild bool
)
if stat, err := os.Stat(srv.bin); err == nil {
binModTime = stat.ModTime()
if !restart {
restart = binModTime.After(srv.startTime)
}
}
if len(srv.target) > 0 && len(srv.dep) == 0 {
dep, err := ComputeDep(&srv.context, srv.target)
if err != nil {
return err
}
srv.dep = dep
}
mtime, err := ModTimeList(srv.dep, nil)
if err != nil {
return err
}
rebuild = mtime.After(binModTime)
restart = restart || rebuild
if !restart && srv.resources != nil {
mtime, err := ModTimeList(srv.resources.Paths, srv.resources.Ignore)
if err != nil {
return err
}
restart = mtime.After(srv.startTime)
}
if !restart {
return nil
}
if err := srv.Stop(); err != nil {
return err
}
if rebuild {
if err := srv.build(); err != nil {
return err
}
}
return srv.Start()
}
func (srv *Server) ServeHTTP(w http.ResponseWriter, r *http.Request) error {
transport := new(http.Transport)
h, ok := w.(http.Hijacker)
if !ok {
return errors.New("Unable to hijack connection")
}
r.Host = srv.addr
r.URL.Host = r.Host
if len(r.URL.Scheme) == 0 {
r.URL.Scheme = "http"
}
response, err := transport.RoundTrip(r)
if err != nil {
return err
}
conn, _, err := h.Hijack()
if err != nil {
return err
}
defer conn.Close()
defer response.Body.Close()
return response.Write(conn)
}