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Create http server listening on unix sockets or systemd socket activated fds
## Quick Usage
Just replace `http.ListenAndServe` with `anyhttp.ListenAndServe`.
```diff
- http.ListenAndServe(addr, h)
+ anyhttp.ListenAndServe(addr, h)
```
### Address Syntax
#### Unix socket
Syntax
unix/<path to socket>
Examples
unix/relative/path.sock
unix//var/run/app/absolutepath.sock
#### Systemd Socket activated fd:
Syntax
sysd/fdidx/<fd index starting at 0>
sysd/fdname/<fd name set using FileDescriptorName socket setting >
Examples:
# First (or only) socket fd passed to app
sysd/fdidx/0
# Socket with FileDescriptorName
sysd/fdname/myapp
# Using default name
sysd/fdname/myapp.socket
#### TCP port
If the address is a number less than 65536, it is assumed as a port and passed as `http.ListenAndServe(":<port>",...)`
Anything else is directly passed to `http.ListenAndServe` as well. Below examples should work
:http
:8888
127.0.0.1:8080

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// Package anyhttp has helpers to serve http from unix sockets and systemd socket activated fds
package anyhttp
import (
"errors"
"fmt"
"io/fs"
"net"
"net/http"
"os"
"strconv"
"strings"
"syscall"
)
type UnixSocketConfig struct {
SocketPath string
SocketMode fs.FileMode
RemoveExisting bool
}
var DefaultUnixSocketConfig = UnixSocketConfig{
SocketMode: 0666,
RemoveExisting: true,
}
func NewUnixSocketConfig(socketPath string) UnixSocketConfig {
usc := DefaultUnixSocketConfig
usc.SocketPath = socketPath
return usc
}
type SysdConfig struct {
FDIndex *int
FDName *string
CheckPID bool
UnsetEnv bool
}
var DefaultSysdConfig = SysdConfig{
CheckPID: true,
UnsetEnv: false,
}
func NewSysDConfigWithFDIdx(fdIdx int) SysdConfig {
sysc := DefaultSysdConfig
sysc.FDIndex = &fdIdx
return sysc
}
func NewSysDConfigWithFDName(fdName string) SysdConfig {
sysc := DefaultSysdConfig
sysc.FDName = &fdName
return sysc
}
func (u *UnixSocketConfig) GetListener() (net.Listener, error) {
if u.RemoveExisting {
if err := os.Remove(u.SocketPath); err != nil && !errors.Is(err, fs.ErrNotExist) {
return nil, err
}
}
l, err := net.Listen("unix", u.SocketPath)
if err != nil {
return nil, err
}
if err = os.Chmod(u.SocketPath, u.SocketMode); err != nil {
return nil, err
}
return l, nil
}
const StartFD = 3
func makeFdListener(fd int, name string) (net.Listener, error) {
fdFile := os.NewFile(uintptr(fd), name)
l, err := net.FileListener(fdFile)
if err != nil {
return nil, err
}
syscall.CloseOnExec(fd)
return l, nil
}
func (s *SysdConfig) GetListener() (net.Listener, error) {
if s.UnsetEnv {
defer UnsetSystemdListenVars()
}
if s.CheckPID {
pid, err := strconv.Atoi(os.Getenv("LISTEN_PID"))
if err != nil {
return nil, err
}
if pid != os.Getpid() {
return nil, fmt.Errorf("fd not for you")
}
}
numFds, err := strconv.Atoi(os.Getenv("LISTEN_FDS"))
if err != nil {
return nil, err
}
fdNames := strings.Split(os.Getenv("LISTEN_FDNAMES"), ":")
if s.FDIndex != nil {
idx := *s.FDIndex
if idx < 0 || idx >= numFds {
return nil, fmt.Errorf("invalid fd")
}
fd := StartFD + idx
if idx < len(fdNames) {
return makeFdListener(fd, fdNames[idx])
} else {
return makeFdListener(fd, fmt.Sprintf("sysdfd_%d", fd))
}
}
if s.FDName != nil {
for idx, name := range fdNames {
if name == *s.FDName {
fd := StartFD + idx
return makeFdListener(fd, name)
}
}
return nil, fmt.Errorf("fdName not found: %q", *s.FDName)
}
return nil, fmt.Errorf("neither FDIndex nor FDName set")
}
// GetListener gets a unix or systemd socket listener
func GetListener(addr string) (net.Listener, error) {
if strings.HasPrefix(addr, "unix/") {
usc := NewUnixSocketConfig(strings.TrimPrefix(addr, "unix/"))
return usc.GetListener()
}
if strings.HasPrefix(addr, "sysd/fdidx/") {
idx, err := strconv.Atoi(strings.TrimPrefix(addr, "sysd/fdidx/"))
if err != nil {
return nil, err
}
sysdc := NewSysDConfigWithFDIdx(idx)
return sysdc.GetListener()
}
if strings.HasPrefix(addr, "sysd/fdname/") {
sysdc := NewSysDConfigWithFDName(strings.TrimPrefix(addr, "sysd/fdname/"))
return sysdc.GetListener()
}
return nil, nil
}
func ListenAndServe(addr string, h http.Handler) error {
listener, err := GetListener(addr)
if err != nil {
return err
}
if listener != nil {
return http.Serve(listener, h)
}
if port, err := strconv.Atoi(addr); err == nil {
if port > 0 && port < 65536 {
return http.ListenAndServe(fmt.Sprintf(":%v", port), h)
}
return fmt.Errorf("invalid port: %v", port)
}
return http.ListenAndServe(addr, h)
}
func UnsetSystemdListenVars() {
os.Unsetenv("LISTEN_PID")
os.Unsetenv("LISTEN_FDS")
os.Unsetenv("LISTEN_FDNAMES")
}

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module go.balki.me/anyhttp
go 1.20