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Feersum.xs
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Feersum.xs
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#include "EVAPI.h"
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <errno.h>
#include <ctype.h>
#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <sys/uio.h>
#include "ppport.h"
#ifdef __GNUC__
# define likely(x) __builtin_expect(!!(x), 1)
# define unlikely(x) __builtin_expect(!!(x), 0)
#else
# define likely(x) (x)
# define unlikely(x) (x)
#endif
#ifndef CRLF
#define CRLF "\015\012"
#endif
#define CRLFx2 CRLF CRLF
// make darwin, solaris and bsd happy:
#ifndef SOL_TCP
#define SOL_TCP IPPROTO_TCP
#endif
// Wish-list: %z formats for perl sprintf. Would make compiling a lot less
// noisy for systems that warn size_t and STRLEN are incompatible with
// %d/%u/%x.
#if Size_t_size == LONGSIZE
# define Sz_f "l"
# define Sz_t long
#elif Size_t_size == 8 && defined HAS_QUAD && QUADKIND == QUAD_IS_LONG_LONG
# define Sz_f "ll"
# define Sz_t long long
#else
// hope "int" works.
# define Sz_f ""
# define Sz_t int
#endif
#define Sz_uf Sz_f"u"
#define Sz_xf Sz_f"x"
#define Ssz_df Sz_f"d"
#define Sz unsigned Sz_t
#define Ssz Sz_t
// if you change these, also edit the LIMITS section in the POD
#define MAX_HEADERS 64
#define MAX_HEADER_NAME_LEN 128
#define MAX_BODY_LENGTH 2147483647
// Read buffers start out at READ_INIT_FACTOR * READ_BUFSZ bytes.
// If another read is needed and the buffer is under READ_BUFSZ bytes
// then the buffer gets an additional READ_GROW_FACTOR * READ_BUFSZ bytes.
// The trade-off with the grow factor is memory usage vs. system calls.
#define READ_BUFSZ 4096
#define READ_INIT_FACTOR 2
#define READ_GROW_FACTOR 8
// Setting this to true will wait for writability before calling write() (will
// try to immediately write otherwise)
#define AUTOCORK_WRITES 1
#define WARN_PREFIX "Feersum: "
#ifndef DEBUG
#ifndef __inline
#define __inline
#endif
#define INLINE_UNLESS_DEBUG __inline
#else
#define INLINE_UNLESS_DEBUG
#endif
#define trouble(f_, ...) warn(WARN_PREFIX f_, ##__VA_ARGS__);
#ifdef DEBUG
#define trace(f_, ...) warn("%s:%d [%d] " f_, __FILE__, __LINE__, (int)getpid(), ##__VA_ARGS__)
#else
#define trace(...)
#endif
#if DEBUG >= 2
#define trace2(f_, ...) trace(f_, ##__VA_ARGS__)
#else
#define trace2(...)
#endif
#if DEBUG >= 3
#define trace3(f_, ...) trace(f_, ##__VA_ARGS__)
#else
#define trace3(...)
#endif
#include "picohttpparser-git/picohttpparser.c"
#include "rinq.c"
// Check FEERSUM_IOMATRIX_SIZE against what's actually usable on this
// platform. See $iomatrix_size in Makefile.PL for the default.
#if FEERSUM_IOMATRIX_SIZE > IOV_MAX
# undef FEERSUM_IOMATRIX_SIZE
# define FEERSUM_IOMATRIX_SIZE IOV_MAX
#endif
struct iomatrix {
unsigned offset;
unsigned count;
struct iovec iov[FEERSUM_IOMATRIX_SIZE];
SV *sv[FEERSUM_IOMATRIX_SIZE];
};
struct feer_req {
SV *buf;
const char* method;
size_t method_len;
const char* path;
size_t path_len;
int minor_version;
size_t num_headers;
struct phr_header headers[MAX_HEADERS];
};
#define RESPOND_NOT_STARTED 0
#define RESPOND_NORMAL 1
#define RESPOND_STREAMING 2
#define RESPOND_SHUTDOWN 3
#define RECEIVE_HEADERS 0
#define RECEIVE_BODY 1
#define RECEIVE_STREAMING 2
#define RECEIVE_SHUTDOWN 3
struct feer_conn {
SV *self;
int fd;
struct sockaddr *sa;
struct ev_io read_ev_io;
struct ev_io write_ev_io;
struct ev_timer read_ev_timer;
SV *rbuf;
struct rinq *wbuf_rinq;
SV *poll_write_cb;
SV *ext_guard;
struct feer_req *req;
ssize_t expected_cl;
ssize_t received_cl;
U16 in_callback;
U16 responding;
U16 receiving;
U16 _reservedflags:13;
U16 is_http11:1;
U16 poll_write_cb_is_io_handle:1;
U16 auto_cl:1;
};
typedef struct feer_conn feer_conn_handle; // for typemap
#define dCONN struct feer_conn *c = (struct feer_conn *)w->data
#define IsArrayRef(_x) (SvROK(_x) && SvTYPE(SvRV(_x)) == SVt_PVAV)
#define IsCodeRef(_x) (SvROK(_x) && SvTYPE(SvRV(_x)) == SVt_PVCV)
static HV* feersum_env(pTHX_ struct feer_conn *c);
static void feersum_start_response
(pTHX_ struct feer_conn *c, SV *message, AV *headers, int streaming);
static size_t feersum_write_whole_body (pTHX_ struct feer_conn *c, SV *body);
static void feersum_handle_psgi_response(
pTHX_ struct feer_conn *c, SV *ret, bool can_recurse);
static int feersum_close_handle(pTHX_ struct feer_conn *c, bool is_writer);
static SV* feersum_conn_guard(pTHX_ struct feer_conn *c, SV *guard);
static void start_read_watcher(struct feer_conn *c);
static void stop_read_watcher(struct feer_conn *c);
static void restart_read_timer(struct feer_conn *c);
static void stop_read_timer(struct feer_conn *c);
static void start_write_watcher(struct feer_conn *c);
static void stop_write_watcher(struct feer_conn *c);
static void try_conn_write(EV_P_ struct ev_io *w, int revents);
static void try_conn_read(EV_P_ struct ev_io *w, int revents);
static void conn_read_timeout(EV_P_ struct ev_timer *w, int revents);
static bool process_request_headers(struct feer_conn *c, int body_offset);
static void sched_request_callback(struct feer_conn *c);
static void call_died (pTHX_ struct feer_conn *c, const char *cb_type);
static void call_request_callback(struct feer_conn *c);
static void call_poll_callback (struct feer_conn *c, bool is_write);
static void pump_io_handle (struct feer_conn *c, SV *io);
static void conn_write_ready (struct feer_conn *c);
static void respond_with_server_error(struct feer_conn *c, const char *msg, STRLEN msg_len, int code);
static STRLEN add_sv_to_wbuf (struct feer_conn *c, SV *sv);
static STRLEN add_const_to_wbuf (struct feer_conn *c, const char const *str, size_t str_len);
#define add_crlf_to_wbuf(c) add_const_to_wbuf(c,CRLF,2)
static void finish_wbuf (struct feer_conn *c);
static void add_chunk_sv_to_wbuf (struct feer_conn *c, SV *sv);
static void add_placeholder_to_wbuf (struct feer_conn *c, SV **sv, struct iovec **iov_ref);
static void uri_decode_sv (SV *sv);
static bool str_eq(const char *a, int a_len, const char *b, int b_len);
static bool str_case_eq(const char *a, int a_len, const char *b, int b_len);
static SV* fetch_av_normal (pTHX_ AV *av, I32 i);
static const char const *http_code_to_msg (int code);
static int prep_socket (int fd);
static HV *feer_stash, *feer_conn_stash;
static HV *feer_conn_reader_stash = NULL, *feer_conn_writer_stash = NULL;
static MGVTBL psgix_io_vtbl;
static SV *request_cb_cv = NULL;
static bool request_cb_is_psgi = 0;
static SV *shutdown_cb_cv = NULL;
static bool shutting_down = 0;
static int active_conns = 0;
static double read_timeout = 5.0;
static SV *feer_server_name = NULL;
static SV *feer_server_port = NULL;
static ev_io accept_w;
static ev_prepare ep;
static ev_check ec;
struct ev_idle ei;
static struct rinq *request_ready_rinq = NULL;
static AV *psgi_ver;
static SV *psgi_serv10, *psgi_serv11, *crlf_sv;
// TODO: make this thread-local if and when there are multiple C threads:
struct ev_loop *feersum_ev_loop = NULL;
static HV *feersum_tmpl_env = NULL;
INLINE_UNLESS_DEBUG
static SV*
fetch_av_normal (pTHX_ AV *av, I32 i)
{
SV **elt = av_fetch(av, i, 0);
if (elt == NULL) return NULL;
SV *sv = *elt;
// copy to remove magic
if (unlikely(SvMAGICAL(sv))) sv = sv_2mortal(newSVsv(sv));
if (unlikely(!SvOK(sv))) return NULL;
// usually array ref elems aren't RVs (for PSGI anyway)
if (unlikely(SvROK(sv))) sv = SvRV(sv);
return sv;
}
INLINE_UNLESS_DEBUG
static struct iomatrix *
next_iomatrix (struct feer_conn *c)
{
bool add_iomatrix = 0;
struct iomatrix *m;
if (!c->wbuf_rinq) {
trace3("next_iomatrix(%d): head\n", c->fd);
add_iomatrix = 1;
}
else {
// get the tail-end struct
m = (struct iomatrix *)c->wbuf_rinq->prev->ref;
trace3("next_iomatrix(%d): tail, count=%d, offset=%d\n",
c->fd, m->count, m->offset);
if (m->count >= FEERSUM_IOMATRIX_SIZE) {
add_iomatrix = 1;
}
}
if (add_iomatrix) {
trace3("next_iomatrix(%d): malloc\n", c->fd);
Newx(m,1,struct iomatrix);
Poison(m,1,struct iomatrix);
m->offset = m->count = 0;
rinq_push(&c->wbuf_rinq, m);
}
trace3("next_iomatrix(%d): end, count=%d, offset=%d\n",
c->fd, m->count, m->offset);
return m;
}
INLINE_UNLESS_DEBUG
static STRLEN
add_sv_to_wbuf(struct feer_conn *c, SV *sv)
{
struct iomatrix *m = next_iomatrix(c);
int idx = m->count++;
STRLEN cur;
if (unlikely(SvMAGICAL(sv))) {
sv = newSVsv(sv); // copy to force it to be normal.
}
else if (unlikely(SvPADTMP(sv))) {
// PADTMPs have their PVs re-used, so we can't simply keep a
// reference. TEMPs maybe behave in a similar way and are potentially
// stealable.
#ifdef FEERSUM_STEAL
if (SvFLAGS(sv) == SVs_PADTMP|SVf_POK|SVp_POK) {
trace3("STEALING\n");
// XXX: EGREGIOUS HACK THAT MAKES THINGS A LOT FASTER
// steal the PV from a PADTMP PV
SV *theif = newSV(0);
sv_upgrade(theif, SVt_PV);
SvPV_set(theif, SvPVX(sv));
SvLEN_set(theif, SvLEN(sv));
SvCUR_set(theif, SvCUR(sv));
// make the temp null
(void)SvOK_off(sv);
SvPV_set(sv, NULL);
SvLEN_set(sv, 0);
SvCUR_set(sv, 0);
SvFLAGS(theif) |= SVf_READONLY|SVf_POK|SVp_POK;
sv = theif;
}
else {
// be safe and just make a copy
sv = newSVsv(sv);
}
#else
// Make a simple copy (which duplicates the PV almost all of the time)
sv = newSVsv(sv);
#endif
}
else {
sv = SvREFCNT_inc(sv);
}
m->iov[idx].iov_base = SvPV(sv, cur);
m->iov[idx].iov_len = cur;
m->sv[idx] = sv;
return cur;
}
INLINE_UNLESS_DEBUG
static STRLEN
add_const_to_wbuf(struct feer_conn *c, const char const *str, size_t str_len)
{
struct iomatrix *m = next_iomatrix(c);
int idx = m->count++;
m->iov[idx].iov_base = (void*)str;
m->iov[idx].iov_len = str_len;
m->sv[idx] = NULL;
return str_len;
}
INLINE_UNLESS_DEBUG
static void
add_placeholder_to_wbuf(struct feer_conn *c, SV **sv, struct iovec **iov_ref)
{
struct iomatrix *m = next_iomatrix(c);
int idx = m->count++;
*sv = newSV(31);
SvPOK_on(*sv);
m->sv[idx] = *sv;
*iov_ref = &m->iov[idx];
}
static void
finish_wbuf(struct feer_conn *c)
{
if (!c->is_http11) return; // nothing required
add_const_to_wbuf(c, "0\r\n\r\n", 5); // terminating chunk
}
#define update_wbuf_placeholder(c,sv,iov) iov->iov_base = SvPV(sv, iov->iov_len)
static void
add_chunk_sv_to_wbuf(struct feer_conn *c, SV *sv)
{
SV *chunk;
struct iovec *chunk_iov;
add_placeholder_to_wbuf(c, &chunk, &chunk_iov);
STRLEN cur = add_sv_to_wbuf(c, sv);
add_crlf_to_wbuf(c);
sv_setpvf(chunk, "%"Sz_xf CRLF, (Sz)cur);
update_wbuf_placeholder(c, chunk, chunk_iov);
}
static const char const *
http_code_to_msg (int code) {
// http://en.wikipedia.org/wiki/List_of_HTTP_status_codes
switch (code) {
case 100: return "Continue";
case 101: return "Switching Protocols";
case 102: return "Processing"; // RFC 2518
case 200: return "OK";
case 201: return "Created";
case 202: return "Accepted";
case 203: return "Non Authoritative Information";
case 204: return "No Content";
case 205: return "Reset Content";
case 206: return "Partial Content";
case 207: return "Multi-Status"; // RFC 4918 (WebDav)
case 300: return "Multiple Choices";
case 301: return "Moved Permanently";
case 302: return "Found";
case 303: return "See Other";
case 304: return "Not Modified";
case 305: return "Use Proxy";
case 307: return "Temporary Redirect";
case 400: return "Bad Request";
case 401: return "Unauthorized";
case 402: return "Payment Required";
case 403: return "Forbidden";
case 404: return "Not Found";
case 405: return "Method Not Allowed";
case 406: return "Not Acceptable";
case 407: return "Proxy Authentication Required";
case 408: return "Request Timeout";
case 409: return "Conflict";
case 410: return "Gone";
case 411: return "Length Required";
case 412: return "Precondition Failed";
case 413: return "Request Entity Too Large";
case 414: return "Request URI Too Long";
case 415: return "Unsupported Media Type";
case 416: return "Requested Range Not Satisfiable";
case 417: return "Expectation Failed";
case 418: return "I'm a teapot";
case 421: return "Too Many Connections"; // Microsoft?
case 422: return "Unprocessable Entity"; // RFC 4918
case 423: return "Locked"; // RFC 4918
case 424: return "Failed Dependency"; // RFC 4918
case 425: return "Unordered Collection"; // RFC 3648
case 426: return "Upgrade Required"; // RFC 2817
case 449: return "Retry With"; // Microsoft
case 450: return "Blocked by Parental Controls"; // Microsoft
case 500: return "Internal Server Error";
case 501: return "Not Implemented";
case 502: return "Bad Gateway";
case 503: return "Service Unavailable";
case 504: return "Gateway Timeout";
case 505: return "HTTP Version Not Supported";
case 506: return "Variant Also Negotiates"; // RFC 2295
case 507: return "Insufficient Storage"; // RFC 4918
case 509: return "Bandwidth Limit Exceeded"; // Apache mod
case 510: return "Not Extended"; // RFC 2774
case 530: return "User access denied"; // ??
default: break;
}
// default to the Nxx group names in RFC 2616
if (100 <= code && code <= 199) {
return "Informational";
}
else if (200 <= code && code <= 299) {
return "Success";
}
else if (300 <= code && code <= 399) {
return "Redirection";
}
else if (400 <= code && code <= 499) {
return "Client Error";
}
else {
return "Error";
}
}
static int
prep_socket(int fd)
{
int flags;
// make it non-blocking
flags = O_NONBLOCK;
if (unlikely(fcntl(fd, F_SETFL, flags) < 0))
return -1;
// flush writes immediately
flags = 1;
if (unlikely(setsockopt(fd, SOL_TCP, TCP_NODELAY, &flags, sizeof(int))))
return -1;
// handle URG data inline
flags = 1;
if (unlikely(setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &flags, sizeof(int))))
return -1;
// disable lingering
struct linger linger = { .l_onoff = 0, .l_linger = 0 };
if (unlikely(setsockopt(fd, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger))))
return -1;
return 0;
}
INLINE_UNLESS_DEBUG static void
safe_close_conn(struct feer_conn *c, const char *where)
{
if (unlikely(c->fd < 0))
return;
// make it blocking
fcntl(c->fd, F_SETFL, 0);
if (unlikely(close(c->fd)))
perror(where);
c->fd = -1;
}
static struct feer_conn *
new_feer_conn (EV_P_ int conn_fd, struct sockaddr *sa)
{
SV *self = newSV(0);
SvUPGRADE(self, SVt_PVMG); // ensures sv_bless doesn't reallocate
SvGROW(self, sizeof(struct feer_conn));
SvPOK_only(self);
SvIOK_on(self);
SvIV_set(self,conn_fd);
struct feer_conn *c = (struct feer_conn *)SvPVX(self);
Zero(c, 1, struct feer_conn);
c->self = self;
c->fd = conn_fd;
c->sa = sa;
ev_io_init(&c->read_ev_io, try_conn_read, conn_fd, EV_READ);
c->read_ev_io.data = (void *)c;
ev_init(&c->read_ev_timer, conn_read_timeout);
c->read_ev_timer.data = (void *)c;
trace3("made conn fd=%d self=%p, c=%p, cur=%"Sz_uf", len=%"Sz_uf"\n",
c->fd, self, c, (Sz)SvCUR(self), (Sz)SvLEN(self));
SV *rv = newRV_inc(c->self);
sv_bless(rv, feer_conn_stash); // so DESTROY can get called on read errors
SvREFCNT_dec(rv);
SvREADONLY_on(self); // turn off later for blessing
active_conns++;
return c;
}
// for use in the typemap:
INLINE_UNLESS_DEBUG
static struct feer_conn *
sv_2feer_conn (SV *rv)
{
if (unlikely(!sv_isa(rv,"Feersum::Connection")))
croak("object is not of type Feersum::Connection");
return (struct feer_conn *)SvPVX(SvRV(rv));
}
INLINE_UNLESS_DEBUG
static SV*
feer_conn_2sv (struct feer_conn *c)
{
return newRV_inc(c->self);
}
static feer_conn_handle *
sv_2feer_conn_handle (SV *rv, bool can_croak)
{
trace3("sv 2 conn_handle\n");
if (unlikely(!SvROK(rv))) croak("Expected a reference");
// do not allow subclassing
SV *sv = SvRV(rv);
if (likely(
sv_isobject(rv) &&
(SvSTASH(sv) == feer_conn_writer_stash ||
SvSTASH(sv) == feer_conn_reader_stash)
)) {
UV uv = SvUV(sv);
if (uv == 0) {
if (can_croak) croak("Operation not allowed: Handle is closed.");
return NULL;
}
return INT2PTR(feer_conn_handle*,uv);
}
if (can_croak)
croak("Expected a Feersum::Connection::Writer or ::Reader object");
return NULL;
}
static SV *
new_feer_conn_handle (pTHX_ struct feer_conn *c, bool is_writer)
{
SV *sv;
SvREFCNT_inc_void_NN(c->self);
sv = newRV_noinc(newSVuv(PTR2UV(c)));
sv_bless(sv, is_writer ? feer_conn_writer_stash : feer_conn_reader_stash);
return sv;
}
INLINE_UNLESS_DEBUG static void
start_read_watcher(struct feer_conn *c) {
if (unlikely(ev_is_active(&c->read_ev_io)))
return;
trace("start read watcher %d\n",c->fd);
ev_io_start(feersum_ev_loop, &c->read_ev_io);
SvREFCNT_inc_void_NN(c->self);
}
INLINE_UNLESS_DEBUG static void
stop_read_watcher(struct feer_conn *c) {
if (unlikely(!ev_is_active(&c->read_ev_io)))
return;
trace("stop read watcher %d\n",c->fd);
ev_io_stop(feersum_ev_loop, &c->read_ev_io);
SvREFCNT_dec(c->self);
}
INLINE_UNLESS_DEBUG static void
restart_read_timer(struct feer_conn *c) {
if (likely(!ev_is_active(&c->read_ev_timer))) {
trace("restart read timer %d\n",c->fd);
c->read_ev_timer.repeat = read_timeout;
SvREFCNT_inc_void_NN(c->self);
}
ev_timer_again(feersum_ev_loop, &c->read_ev_timer);
}
INLINE_UNLESS_DEBUG static void
stop_read_timer(struct feer_conn *c) {
if (unlikely(!ev_is_active(&c->read_ev_timer)))
return;
trace("stop read timer %d\n",c->fd);
ev_timer_stop(feersum_ev_loop, &c->read_ev_timer);
SvREFCNT_dec(c->self);
}
INLINE_UNLESS_DEBUG static void
start_write_watcher(struct feer_conn *c) {
if (unlikely(ev_is_active(&c->write_ev_io)))
return;
trace("start write watcher %d\n",c->fd);
ev_io_start(feersum_ev_loop, &c->write_ev_io);
SvREFCNT_inc_void_NN(c->self);
}
INLINE_UNLESS_DEBUG static void
stop_write_watcher(struct feer_conn *c) {
if (unlikely(!ev_is_active(&c->write_ev_io)))
return;
trace("stop write watcher %d\n",c->fd);
ev_io_stop(feersum_ev_loop, &c->write_ev_io);
SvREFCNT_dec(c->self);
}
static void
process_request_ready_rinq (void)
{
while (request_ready_rinq) {
struct feer_conn *c =
(struct feer_conn *)rinq_shift(&request_ready_rinq);
//trace("rinq shifted c=%p, head=%p\n", c, request_ready_rinq);
call_request_callback(c);
if (likely(c->wbuf_rinq)) {
// this was deferred until after the perl callback
conn_write_ready(c);
}
SvREFCNT_dec(c->self); // for the rinq
}
}
static void
prepare_cb (EV_P_ ev_prepare *w, int revents)
{
if (unlikely(revents & EV_ERROR)) {
trouble("EV error in prepare, revents=0x%08x\n", revents);
ev_break(EV_A, EVBREAK_ALL);
return;
}
if (!ev_is_active(&accept_w) && !shutting_down) {
ev_io_start(EV_A, &accept_w);
}
ev_prepare_stop(EV_A, w);
}
static void
check_cb (EV_P_ ev_check *w, int revents)
{
if (unlikely(revents & EV_ERROR)) {
trouble("EV error in check, revents=0x%08x\n", revents);
ev_break(EV_A, EVBREAK_ALL);
return;
}
trace3("check! head=%p\n", request_ready_rinq);
if (request_ready_rinq)
process_request_ready_rinq();
}
static void
idle_cb (EV_P_ ev_idle *w, int revents)
{
if (unlikely(revents & EV_ERROR)) {
trouble("EV error in idle, revents=0x%08x\n", revents);
ev_break(EV_A, EVBREAK_ALL);
return;
}
trace3("idle! head=%p\n", request_ready_rinq);
if (request_ready_rinq)
process_request_ready_rinq();
ev_idle_stop(EV_A, w);
}
static void
try_conn_write(EV_P_ struct ev_io *w, int revents)
{
dCONN;
int i;
struct iomatrix *m;
SvREFCNT_inc_void_NN(c->self);
// if it's marked writeable EV suggests we simply try write to it.
// Otherwise it is stopped and we should ditch this connection.
if (unlikely(revents & EV_ERROR && !(revents & EV_WRITE))) {
trace("EV error on write, fd=%d revents=0x%08x\n", w->fd, revents);
c->responding = RESPOND_SHUTDOWN;
goto try_write_finished;
}
if (unlikely(!c->wbuf_rinq)) {
if (unlikely(c->responding == RESPOND_SHUTDOWN))
goto try_write_finished;
if (!c->poll_write_cb) {
// no callback and no data: wait for app to push to us.
if (c->responding == RESPOND_STREAMING)
goto try_write_paused;
trace("tried to write with an empty buffer %d resp=%d\n",w->fd,c->responding);
c->responding = RESPOND_SHUTDOWN;
goto try_write_finished;
}
if (c->poll_write_cb_is_io_handle)
pump_io_handle(c, c->poll_write_cb);
else
call_poll_callback(c, 1);
// callback didn't write anything:
if (unlikely(!c->wbuf_rinq)) goto try_write_again;
}
try_write_again_immediately:
m = (struct iomatrix *)c->wbuf_rinq->ref;
#if DEBUG >= 2
warn("going to write to %d:\n",c->fd);
for (i=0; i < m->count; i++) {
fprintf(stderr,"%.*s",
(int)m->iov[i].iov_len, (char*)m->iov[i].iov_base);
}
#endif
trace("going to write %d off=%d count=%d\n", w->fd, m->offset, m->count);
errno = 0;
ssize_t wrote = writev(w->fd, &m->iov[m->offset], m->count - m->offset);
trace("wrote %"Sz_uf" bytes to %d, errno=%d\n", (Sz)wrote, w->fd, errno);
if (unlikely(wrote <= 0)) {
if (unlikely(wrote == 0))
goto try_write_again;
if (likely(errno == EAGAIN || errno == EINTR))
goto try_write_again;
perror("Feersum try_conn_write");
c->responding = RESPOND_SHUTDOWN;
goto try_write_finished;
}
for (i = 0; i < m->count; i++) {
struct iovec *v = &m->iov[i];
if (unlikely(v->iov_len > wrote)) {
trace3("offset vector %d base=%p len=%"Sz_uf"\n",
w->fd, v->iov_base, (Sz)v->iov_len);
v->iov_base += wrote;
v->iov_len -= wrote;
}
else {
trace3("consume vector %d base=%p len=%"Sz_uf" sv=%p\n",
w->fd, v->iov_base, (Sz)v->iov_len, m->sv[i]);
wrote -= v->iov_len;
m->offset++;
if (m->sv[i]) {
SvREFCNT_dec(m->sv[i]);
m->sv[i] = NULL;
}
}
}
if (likely(m->offset >= m->count)) {
trace2("all done with iomatrix %d state=%d\n",w->fd,c->responding);
rinq_shift(&c->wbuf_rinq);
Safefree(m);
if (!c->wbuf_rinq)
goto try_write_finished;
trace2("write again immediately %d state=%d\n",w->fd,c->responding);
goto try_write_again_immediately;
}
// else, fallthrough:
trace2("write fallthrough %d state=%d\n",w->fd,c->responding);
try_write_again:
trace("write again %d state=%d\n",w->fd,c->responding);
start_write_watcher(c);
goto try_write_cleanup;
try_write_finished:
// should always be responding, but just in case
switch(c->responding) {
case RESPOND_NOT_STARTED:
// the write watcher shouldn't ever get called before starting to
// respond. Shut it down if it does.
trace("unexpected try_write when response not started %d\n",c->fd);
goto try_write_shutdown;
case RESPOND_NORMAL:
goto try_write_shutdown;
case RESPOND_STREAMING:
if (c->poll_write_cb) goto try_write_again;
else goto try_write_paused;
case RESPOND_SHUTDOWN:
goto try_write_shutdown;
default:
goto try_write_cleanup;
}
try_write_paused:
trace3("write PAUSED %d, refcnt=%d, state=%d\n", c->fd, SvREFCNT(c->self), c->responding);
stop_write_watcher(c);
goto try_write_cleanup;
try_write_shutdown:
trace3("write SHUTDOWN %d, refcnt=%d, state=%d\n", c->fd, SvREFCNT(c->self), c->responding);
c->responding = RESPOND_SHUTDOWN;
stop_write_watcher(c);
safe_close_conn(c, "close at write shutdown");
try_write_cleanup:
SvREFCNT_dec(c->self);
return;
}
static int
try_parse_http(struct feer_conn *c, size_t last_read)
{
struct feer_req *req = c->req;
if (likely(!req)) {
Newxz(req,1,struct feer_req);
req->num_headers = MAX_HEADERS;
c->req = req;
}
return phr_parse_request(SvPVX(c->rbuf), SvCUR(c->rbuf),
&req->method, &req->method_len,
&req->path, &req->path_len, &req->minor_version,
req->headers, &req->num_headers,
(SvCUR(c->rbuf)-last_read));
}
static void
try_conn_read(EV_P_ ev_io *w, int revents)
{
dCONN;
SvREFCNT_inc_void_NN(c->self);
// if it's marked readable EV suggests we simply try read it. Otherwise it
// is stopped and we should ditch this connection.
if (unlikely(revents & EV_ERROR && !(revents & EV_READ))) {
trace("EV error on read, fd=%d revents=0x%08x\n", w->fd, revents);
goto try_read_error;
}
if (unlikely(c->receiving == RECEIVE_SHUTDOWN))
goto dont_read_again;
trace("try read %d\n",w->fd);
if (likely(!c->rbuf)) { // likely = optimize for small requests
trace("init rbuf for %d\n",w->fd);
c->rbuf = newSV(READ_INIT_FACTOR*READ_BUFSZ + 1);
SvPOK_on(c->rbuf);
}
ssize_t space_free = SvLEN(c->rbuf) - SvCUR(c->rbuf);
if (unlikely(space_free < READ_BUFSZ)) { // unlikely = optimize for small
size_t new_len = SvLEN(c->rbuf) + READ_GROW_FACTOR*READ_BUFSZ;
trace("moar memory %d: %"Sz_uf" to %"Sz_uf"\n",
w->fd, (Sz)SvLEN(c->rbuf), (Sz)new_len);
SvGROW(c->rbuf, new_len);
space_free += READ_GROW_FACTOR*READ_BUFSZ;
}
char *cur = SvPVX(c->rbuf) + SvCUR(c->rbuf);
ssize_t got_n = read(w->fd, cur, space_free);
if (unlikely(got_n <= 0)) {
if (unlikely(got_n == 0)) {
trace("EOF before complete request: %d\n",w->fd,SvCUR(c->rbuf));
goto try_read_error;
}
if (likely(errno == EAGAIN || errno == EINTR))
goto try_read_again;
perror("try_conn_read error");
goto try_read_error;
}
trace("read %d %"Ssz_df"\n", w->fd, (Ssz)got_n);
SvCUR(c->rbuf) += got_n;
// likely = optimize for small requests
if (likely(c->receiving == RECEIVE_HEADERS)) {
int ret = try_parse_http(c, (size_t)got_n);
if (ret == -1) goto try_read_bad;
if (ret == -2) goto try_read_again;
if (process_request_headers(c, ret))
goto try_read_again_reset_timer;
else
goto dont_read_again;
}
else if (likely(c->receiving == RECEIVE_BODY)) {
c->received_cl += got_n;
if (c->received_cl < c->expected_cl)
goto try_read_again_reset_timer;
// body is complete
sched_request_callback(c);
goto dont_read_again;
}
else {
trouble("unknown read state %d %d", w->fd, c->receiving);
}
// fallthrough:
try_read_error:
trace("READ ERROR %d, refcnt=%d\n", w->fd, SvREFCNT(c->self));
c->receiving = RECEIVE_SHUTDOWN;
c->responding = RESPOND_SHUTDOWN;
stop_read_watcher(c);
stop_read_timer(c);
stop_write_watcher(c);
goto try_read_cleanup;
try_read_bad:
trace("bad request %d\n", w->fd);
respond_with_server_error(c, "Malformed request.\n", 0, 400);
// TODO: when keep-alive, close conn instead of fallthrough here.
// fallthrough:
dont_read_again:
trace("done reading %d\n", w->fd);
c->receiving = RECEIVE_SHUTDOWN;
stop_read_watcher(c);
stop_read_timer(c);
goto try_read_cleanup;
try_read_again_reset_timer:
trace("(reset read timer) %d\n", w->fd);
restart_read_timer(c);
// fallthrough:
try_read_again:
trace("read again %d\n", w->fd);
start_read_watcher(c);
try_read_cleanup:
SvREFCNT_dec(c->self);
}
static void
conn_read_timeout (EV_P_ ev_timer *w, int revents)
{
dCONN;
SvREFCNT_inc_void_NN(c->self);
if (unlikely(!(revents & EV_TIMER) || c->receiving == RECEIVE_SHUTDOWN)) {
// if there's no EV_TIMER then EV has stopped it on an error
if (revents & EV_ERROR)
trouble("EV error on read timer, fd=%d revents=0x%08x\n",
c->fd,revents);
goto read_timeout_cleanup;
}
trace("read timeout %d\n", c->fd);
if (likely(c->responding == RESPOND_NOT_STARTED)) {
const char *msg;
if (c->receiving == RECEIVE_HEADERS) {
msg = "Headers took too long.";