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v/vlib/picoev/picoev.v

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// Copyright (c) 2019-2023 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module picoev
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import net
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import picohttpparser
#include <errno.h>
#include <netinet/tcp.h>
#include <signal.h>
#flag -I @VEXEROOT/thirdparty/picoev
#flag @VEXEROOT/thirdparty/picoev/picoev.o
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#include "src/picoev.h"
[typedef]
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struct C.picoev_loop {}
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fn C.picoev_del(&C.picoev_loop, int) int
fn C.picoev_set_timeout(&C.picoev_loop, int, int)
// fn C.picoev_handler(loop &C.picoev_loop, fd int, revents int, cb_arg voidptr)
// TODO: (sponge) update to C.picoev_handler with C type def update
type PicoevHandler = fn (loop &C.picoev_loop, fd int, revents int, context voidptr)
fn C.picoev_add(&C.picoev_loop, int, int, int, &PicoevHandler, voidptr) int
fn C.picoev_init(int) int
fn C.picoev_create_loop(int) &C.picoev_loop
fn C.picoev_loop_once(&C.picoev_loop, int) int
fn C.picoev_destroy_loop(&C.picoev_loop) int
fn C.picoev_deinit() int
const (
max_fds = 1024
max_timeout = 10
max_read = 4096
max_write = 8192
)
enum Event {
read = C.PICOEV_READ
write = C.PICOEV_WRITE
timeout = C.PICOEV_TIMEOUT
add = C.PICOEV_ADD
del = C.PICOEV_DEL
readwrite = C.PICOEV_READWRITE
}
pub struct Config {
pub:
port int = 8080
cb fn (voidptr, picohttpparser.Request, mut picohttpparser.Response)
err_cb fn (voidptr, picohttpparser.Request, mut picohttpparser.Response, IError) = default_err_cb
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user_data voidptr = unsafe { nil }
timeout_secs int = 8
max_headers int = 100
}
struct Picoev {
loop &C.picoev_loop = unsafe { nil }
cb fn (voidptr, picohttpparser.Request, mut picohttpparser.Response)
err_cb fn (voidptr, picohttpparser.Request, mut picohttpparser.Response, IError)
user_data voidptr
timeout_secs int
max_headers int
mut:
date &u8 = unsafe { nil }
buf &u8 = unsafe { nil }
idx [1024]int
out &u8 = unsafe { nil }
}
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[inline]
fn setup_sock(fd int) ! {
flag := 1
if C.setsockopt(fd, C.IPPROTO_TCP, C.TCP_NODELAY, &flag, sizeof(int)) < 0 {
return error('setup_sock.setup_sock failed')
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}
if C.fcntl(fd, C.F_SETFL, C.O_NONBLOCK) != 0 {
return error('fcntl failed')
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}
}
[inline]
fn close_conn(loop &C.picoev_loop, fd int) {
C.picoev_del(voidptr(loop), fd)
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C.close(fd)
}
[inline]
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fn req_read(fd int, b &u8, max_len int, idx int) int {
unsafe {
return C.read(fd, b + idx, max_len - idx)
}
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}
fn rw_callback(loop &C.picoev_loop, fd int, events int, context voidptr) {
mut p := unsafe { &Picoev(context) }
defer {
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p.idx[fd] = 0
}
if (events & int(Event.timeout)) != 0 {
close_conn(loop, fd)
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return
} else if (events & int(Event.read)) != 0 {
C.picoev_set_timeout(voidptr(loop), fd, p.timeout_secs)
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// Request init
mut buf := p.buf
unsafe {
buf += fd * picoev.max_read // pointer magic
}
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mut req := picohttpparser.Request{}
// Response init
mut out := p.out
unsafe {
out += fd * picoev.max_write // pointer magic
}
mut res := picohttpparser.Response{
fd: fd
date: p.date
buf_start: out
buf: out
}
for {
// Request parsing loop
r := req_read(fd, buf, picoev.max_read, p.idx[fd]) // Get data from socket
if r == 0 {
// connection closed by peer
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close_conn(loop, fd)
return
} else if r == -1 {
// error
if C.errno == C.EAGAIN {
// try again later
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return
}
if C.errno == C.EWOULDBLOCK {
// try again later
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return
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}
// fatal error
close_conn(loop, fd)
return
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}
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p.idx[fd] += r
mut s := unsafe { tos(buf, p.idx[fd]) }
pret := req.parse_request(s, p.max_headers) // Parse request via picohttpparser
if pret > 0 { // Success
break
} else if pret == -1 { // Parse error
p.err_cb(p.user_data, req, mut &res, error('ParseError'))
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return
}
assert pret == -2
// request is incomplete, continue the loop
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if p.idx[fd] == sizeof(buf) {
p.err_cb(p.user_data, req, mut &res, error('RequestIsTooLongError'))
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return
}
}
// Callback (should call .end() itself)
p.cb(p.user_data, req, mut &res)
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}
}
fn accept_callback(loop &C.picoev_loop, fd int, events int, cb_arg voidptr) {
mut p := unsafe { &Picoev(cb_arg) }
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newfd := C.accept(fd, 0, 0)
if newfd != -1 {
setup_sock(newfd) or {
p.err_cb(p.user_data, picohttpparser.Request{}, mut &picohttpparser.Response{},
err)
}
C.picoev_add(voidptr(loop), newfd, int(Event.read), p.timeout_secs, rw_callback,
cb_arg)
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}
}
fn default_err_cb(data voidptr, req picohttpparser.Request, mut res picohttpparser.Response, error IError) {
eprintln('picoev: ${error}')
res.end()
}
pub fn new(config Config) &Picoev {
fd := C.socket(net.AddrFamily.ip, net.SocketType.tcp, 0)
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assert fd != -1
// Setting flags for socket
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flag := 1
assert C.setsockopt(fd, C.SOL_SOCKET, C.SO_REUSEADDR, &flag, sizeof(int)) == 0
$if linux {
assert C.setsockopt(fd, C.SOL_SOCKET, C.SO_REUSEPORT, &flag, sizeof(int)) == 0
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assert C.setsockopt(fd, C.IPPROTO_TCP, C.TCP_QUICKACK, &flag, sizeof(int)) == 0
timeout := 10
assert C.setsockopt(fd, C.IPPROTO_TCP, C.TCP_DEFER_ACCEPT, &timeout, sizeof(int)) == 0
queue_len := 4096
assert C.setsockopt(fd, C.IPPROTO_TCP, C.TCP_FASTOPEN, &queue_len, sizeof(int)) == 0
}
// Setting addr
mut addr := C.sockaddr_in{
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sin_family: u8(C.AF_INET)
sin_port: C.htons(config.port)
sin_addr: C.htonl(C.INADDR_ANY)
}
size := sizeof(C.sockaddr_in)
bind_res := C.bind(fd, voidptr(unsafe { &net.Addr(&addr) }), size)
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assert bind_res == 0
listen_res := C.listen(fd, C.SOMAXCONN)
assert listen_res == 0
setup_sock(fd) or {
config.err_cb(config.user_data, picohttpparser.Request{}, mut &picohttpparser.Response{},
err)
}
C.picoev_init(picoev.max_fds)
loop := C.picoev_create_loop(picoev.max_timeout)
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mut pv := &Picoev{
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loop: loop
cb: config.cb
err_cb: config.err_cb
user_data: config.user_data
timeout_secs: config.timeout_secs
max_headers: config.max_headers
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date: &u8(C.get_date())
buf: unsafe { malloc_noscan(picoev.max_fds * picoev.max_read + 1) }
out: unsafe { malloc_noscan(picoev.max_fds * picoev.max_write + 1) }
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}
C.picoev_add(voidptr(loop), fd, int(Event.read), 0, accept_callback, pv)
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spawn update_date(mut pv)
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return pv
}
pub fn (p Picoev) serve() {
for {
C.picoev_loop_once(p.loop, 1)
}
}
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fn update_date(mut p Picoev) {
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for {
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p.date = &u8(C.get_date())
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C.usleep(1000000)
}
}