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/*
* Copyright (C) Max Romanov
* Copyright (C) NGINX, Inc.
*/
package unit
/*
#include "nxt_cgo_lib.h"
*/
import "C"
import (
"io"
"net"
"os"
"sync"
"unsafe"
)
type port_key struct {
pid int
id int
}
type port struct {
key port_key
rcv *net.UnixConn
snd *net.UnixConn
}
type port_registry struct {
sync.RWMutex
m map[port_key]*port
}
var port_registry_ port_registry
func find_port(key port_key) *port {
port_registry_.RLock()
res := port_registry_.m[key]
port_registry_.RUnlock()
return res
}
func add_port(p *port) {
port_registry_.Lock()
if port_registry_.m == nil {
port_registry_.m = make(map[port_key]*port)
}
old := port_registry_.m[p.key]
if old == nil {
port_registry_.m[p.key] = p
}
port_registry_.Unlock()
}
func (p *port) Close() {
if p.rcv != nil {
p.rcv.Close()
}
if p.snd != nil {
p.snd.Close()
}
}
func getUnixConn(fd int) *net.UnixConn {
if fd < 0 {
return nil
}
f := os.NewFile(uintptr(fd), "sock")
defer f.Close()
c, err := net.FileConn(f)
if err != nil {
nxt_go_alert("FileConn error %s", err)
return nil
}
uc, ok := c.(*net.UnixConn)
if !ok {
nxt_go_alert("Not a Unix-domain socket %d", fd)
return nil
}
return uc
}
//export nxt_go_add_port
func nxt_go_add_port(ctx *C.nxt_unit_ctx_t, p *C.nxt_unit_port_t) C.int {
new_port := &port{
key: port_key{
pid: int(p.id.pid),
id: int(p.id.id),
},
rcv: getUnixConn(int(p.in_fd)),
snd: getUnixConn(int(p.out_fd)),
}
add_port(new_port)
p.in_fd = -1
p.out_fd = -1
if new_port.key.id == 65535 {
go func(ctx *C.nxt_unit_ctx_t) {
C.nxt_unit_run_shared(ctx);
}(ctx)
}
return C.NXT_UNIT_OK
}
//export nxt_go_remove_port
func nxt_go_remove_port(unit *C.nxt_unit_t, p *C.nxt_unit_port_t) {
key := port_key{
pid: int(p.id.pid),
id: int(p.id.id),
}
port_registry_.Lock()
if port_registry_.m != nil {
delete(port_registry_.m, key)
}
port_registry_.Unlock()
}
//export nxt_go_port_send
func nxt_go_port_send(pid C.int, id C.int, buf unsafe.Pointer, buf_size C.int,
oob unsafe.Pointer, oob_size C.int) C.ssize_t {
key := port_key{
pid: int(pid),
id: int(id),
}
p := find_port(key)
if p == nil {
nxt_go_alert("port %d:%d not found", pid, id)
return 0
}
n, oobn, err := p.snd.WriteMsgUnix(GoBytes(buf, buf_size),
GoBytes(oob, oob_size), nil)
if err != nil {
nxt_go_warn("write result %d (%d), %s", n, oobn, err)
n = -1
}
return C.ssize_t(n)
}
//export nxt_go_port_recv
func nxt_go_port_recv(pid C.int, id C.int, buf unsafe.Pointer, buf_size C.int,
oob unsafe.Pointer, oob_size C.int) C.ssize_t {
key := port_key{
pid: int(pid),
id: int(id),
}
p := find_port(key)
if p == nil {
nxt_go_alert("port %d:%d not found", pid, id)
return 0
}
n, oobn, _, _, err := p.rcv.ReadMsgUnix(GoBytes(buf, buf_size),
GoBytes(oob, oob_size))
if err != nil {
if nerr, ok := err.(*net.OpError); ok {
if nerr.Err == io.EOF {
return 0
}
}
nxt_go_warn("read result %d (%d), %s", n, oobn, err)
n = -1
}
return C.ssize_t(n)
}
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