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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 "ppport.h"
#include "picohttpparser-git/picohttpparser.c"
#include "rinq.c"
#ifndef CRLF
#define CRLF "\015\012"
#endif
#define CRLFx2 CRLF CRLF
// 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
#define READ_CHUNK 4096
// 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: " f_, __FILE__, __LINE__, ##__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 <sys/uio.h>
#define IOMATRIX_SIZE 64
struct iomatrix {
uint16_t offset;
uint16_t count;
struct iovec iov[IOMATRIX_SIZE];
SV *sv[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;
struct feer_req *req;
ssize_t expected_cl;
ssize_t received_cl;
int16_t in_callback;
int16_t responding;
int16_t receiving;
bool is_http11;
};
typedef struct feer_conn feer_conn_handle; // for typemap
#define dCONN struct feer_conn *c = (struct feer_conn *)w->data
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 int feersum_write_whole_body (pTHX_ struct feer_conn *c, SV *body);
static void feersum_handle_psgi_response(pTHX_ struct feer_conn *c, SV *ret);
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 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);
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 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 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 struct iomatrix *
next_iomatrix (struct feer_conn *c)
{
bool add_iomatrix = 0;
struct iomatrix *m;
if (!c->wbuf_rinq) {
add_iomatrix = 1;
}
else {
// get the tail-end struct
m = (struct iomatrix *)c->wbuf_rinq->prev->ref;
if (m->count >= IOMATRIX_SIZE) {
add_iomatrix = 1;
}
}
if (add_iomatrix) {
Newx(m,1,struct iomatrix);
Poison(m,1,struct iomatrix);
m->offset = m->count = 0;
rinq_push(&c->wbuf_rinq, m);
}
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 (SvPADTMP(sv) || SvTEMP(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) {
// 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 an just make a simple 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);
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_const_to_wbuf(c, CRLF, 2);
sv_setpvf(chunk, "%x" CRLF, 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;
struct linger linger = { .l_onoff = 0, .l_linger = 0 };
// make it non-blocking
flags = O_NONBLOCK;
if (fcntl(fd, F_SETFL, flags) < 0)
return -1;
// flush writes immediately
flags = 1;
#if PERL_DARWIN
if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &flags, sizeof(int)))
#else
if (setsockopt(fd, SOL_TCP, TCP_NODELAY, &flags, sizeof(int)))
#endif
return -1;
// handle URG data inline
flags = 1;
if (setsockopt(fd, SOL_SOCKET, SO_OOBINLINE, &flags, sizeof(int)))
return -1;
// disable lingering
if (setsockopt(fd, SOL_SOCKET, SO_LINGER, &linger, sizeof(linger)))
return -1;
return 0;
}
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);
SvREADONLY_on(self); // turn off later for blessing
c->self = self;
c->fd = conn_fd;
c->sa = sa;
if (prep_socket(c->fd)) {
perror("prep_socket");
trace("prep_socket failed for %d\n", c->fd);
}
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.repeat = read_timeout;
c->read_ev_timer.data = (void *)c;
ev_timer_again(EV_A, &c->read_ev_timer);
trace3("made conn fd=%d self=%p, c=%p, cur=%d, len=%d\n",
c->fd, self, c, SvCUR(self), SvLEN(self));
active_conns++;
return c;
}
// for use in the typemap:
static struct feer_conn *
sv_2feer_conn (SV *rv)
{
if (!sv_isa(rv,"Feersum::Connection"))
croak("object is not of type Feersum::Connection");
return (struct feer_conn *)SvPVX(SvRV(rv));
}
static SV*
feer_conn_2sv (struct feer_conn *c)
{
SV *rv = newRV_inc(c->self);
if (!SvOBJECT(c->self)) {
trace3("c->self not yet an object\n");
SvREADONLY_off(c->self);
// XXX: should this block use newRV_noinc instead?
sv_bless(rv, feer_conn_stash);
SvREADONLY_on(c->self);
}
return rv;
}
static feer_conn_handle *
sv_2feer_conn_handle (SV *rv, bool can_croak)
{
trace3("sv 2 conn_handle\n");
if (!SvROK(rv))
croak("Expected a reference");
// do not allow subclassing
SV *sv = SvRV(rv);
if (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 (struct feer_conn *c, bool is_writer)
{
SV *sv;
SvREFCNT_inc(c->self);
sv = newRV_noinc(newSVuv(PTR2UV(c)));
sv_bless(sv, is_writer ? feer_conn_writer_stash : feer_conn_reader_stash);
return sv;
}
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 (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 (revents & EV_ERROR) {
trouble("EV error in prepare, revents=0x%08x\n", revents);
ev_unloop(EV_A, EVUNLOOP_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 (revents & EV_ERROR) {
trouble("EV error in check, revents=0x%08x\n", revents);
ev_unloop(EV_A, EVUNLOOP_ALL);
return;
}
trace3("check! head=%p\n", request_ready_rinq);
process_request_ready_rinq();
}
static void
idle_cb (EV_P_ ev_idle *w, int revents)
{
if (revents & EV_ERROR) {
trouble("EV error in idle, revents=0x%08x\n", revents);
ev_unloop(EV_A, EVUNLOOP_ALL);
return;
}
trace3("idle! head=%p\n", 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;
// if it's marked readable EV suggests we simply try write to it.
// Otherwise it is stopped and we should ditch this connection.
if (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 (!c->wbuf_rinq) {
if (c->responding == RESPOND_SHUTDOWN)
goto try_write_finished;
if (!c->poll_write_cb) {
trace("tried to write with an empty buffer %d resp=%d\n",w->fd,c->responding);
ev_io_stop(EV_A, w);
return;
}
call_poll_callback(c, 1);
// callback didn't write anything:
if (!c->wbuf_rinq) goto try_write_again;
}
struct iomatrix *m = (struct iomatrix *)c->wbuf_rinq->ref;
#if DEBUG >= 2
for (i=0; i < m->count; i++) {
fprintf(stderr,"%.*s",m->iov[i].iov_len, m->iov[i].iov_base);
}
#endif
trace("going to write %d off=%d count=%d\n", w->fd, m->offset, m->count);
ssize_t wrote = writev(w->fd, &m->iov[m->offset], m->count - m->offset);
trace("wrote %d bytes to %d\n", wrote, w->fd);
if (wrote == -1) {
if (errno == EAGAIN || errno == EINTR)
goto try_write_again;
perror("try_conn_write");
goto try_write_finished;
}
if (wrote == 0) goto try_write_again;
for (i = 0; i < m->count; i++) {
struct iovec *v = &m->iov[i];
if (v->iov_len > wrote) {
trace3("offset vector %d base=%p len=%lu\n", w->fd, v->iov_base, v->iov_len);
v->iov_base += wrote;
v->iov_len -= wrote;
}
else {
trace3("consume vector %d base=%p len=%lu sv=%p\n", w->fd, v->iov_base, 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 (m->offset >= m->count) {
trace2("all done with iomatrix %d\n",w->fd);
rinq_shift(&c->wbuf_rinq);
Safefree(m);
goto try_write_finished;
}
// else, fallthrough:
try_write_again:
trace("write again %d\n",w->fd);
if (!ev_is_active(w)) {
ev_io_start(EV_A, w);
}
return;
try_write_finished:
// should always be responding, but just in case
if (!c->responding || c->responding == RESPOND_SHUTDOWN) {
ev_io_stop(EV_A, w);
shutdown(c->fd, SHUT_WR);
trace3("ref dec after write %d\n", c->fd);
// TODO: call a completion callback instead of just GCing
SvREFCNT_dec(c->self);
}
else if (c->poll_write_cb) {
goto try_write_again;
}
else {
ev_io_stop(EV_A, w);
}
return;
}
static int
try_parse_http(struct feer_conn *c, size_t last_read)
{
struct feer_req *req = c->req;
if (!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;
// if it's marked readable EV suggests we simply try read it. Otherwise it
// is stopped and we should ditch this connection.
if (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 (c->receiving == RECEIVE_SHUTDOWN) {
ev_io_stop(EV_A, w);
ev_timer_stop(EV_A, &c->read_ev_timer);
return;
}
trace("try read %d\n",w->fd);
if (!c->rbuf) {
trace("init rbuf for %d\n",w->fd);
c->rbuf = newSV(2*READ_CHUNK + 1);
}
if (SvLEN(c->rbuf) - SvCUR(c->rbuf) < READ_CHUNK) {
size_t new_len = SvLEN(c->rbuf) + READ_CHUNK;
trace("moar memory %d: %d to %d\n",w->fd, SvLEN(c->rbuf),new_len);
SvGROW(c->rbuf, new_len);
}
char *cur = SvPVX(c->rbuf) + SvCUR(c->rbuf);
ssize_t got_n = read(w->fd, cur, READ_CHUNK);
if (got_n == -1) {
if (errno == EAGAIN || errno == EINTR)
goto try_read_again;
perror("try_conn_read error");
goto try_read_error;
}
else if (got_n == 0) {
trace("EOF before complete request: %d\n",w->fd,SvCUR(c->rbuf));
goto try_read_error;
}
trace("read %d %d\n", w->fd, got_n);
SvCUR(c->rbuf) += got_n;
if (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 (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 {
warn("unknown read state %d %d", w->fd, c->receiving);
}
// fallthrough:
try_read_error:
trace("READ ERROR %d\n", w->fd);
c->receiving = RECEIVE_SHUTDOWN;
c->responding = RESPOND_SHUTDOWN;
ev_io_stop(EV_A, w);
ev_timer_stop(EV_A, &c->read_ev_timer);
shutdown(c->fd, SHUT_RDWR);
SvREFCNT_dec(c->self);
return;
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;
ev_io_stop(EV_A, w);
ev_timer_stop(EV_A, &c->read_ev_timer);
shutdown(c->fd, SHUT_RD); // TODO: respect keep-alive
return;
try_read_again_reset_timer:
trace("(reset read timer) %d\n", w->fd);
ev_timer_again(EV_A, &c->read_ev_timer);
// fallthrough:
try_read_again:
trace("read again %d\n", w->fd);
if (!ev_is_active(w)) {
ev_io_start(EV_A,w);
}
return;
}
static void
conn_read_timeout (EV_P_ ev_timer *w, int revents)
{
dCONN;
if (!(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);
return;
}
trace("read timeout %d\n", c->fd);
c->receiving = RECEIVE_SHUTDOWN;
ev_io_stop(EV_A, &c->read_ev_io);
// always stop since, for efficiency, we set this up as a recurring timer.
ev_timer_stop(EV_A, w);
if (c->responding == RESPOND_NOT_STARTED) {
shutdown(c->fd, SHUT_RD);
const char *msg;
if (c->receiving == RECEIVE_HEADERS) {
msg = "Headers took too long.";
}
else {
msg = "Timeout reading body.";
}
respond_with_server_error(c, msg, 0, 408);
return;
}
else {
shutdown(c->fd, SHUT_RDWR);
c->responding = RESPOND_SHUTDOWN;
}
// TODO: trigger the Reader poll callback with an error, if present
SvREFCNT_dec(c->self);
}
static void
accept_cb (EV_P_ ev_io *w, int revents)
{
if (shutting_down) {
// shouldn't get called, but be defensive
ev_io_stop(EV_A, w);
close(w->fd);
return;
}
if (revents & EV_ERROR) {
trouble("EV error in accept_cb, fd=%d, revents=0x%08x\n",w->fd,revents);
ev_unloop(EV_A, EVUNLOOP_ALL);
return;
}
trace2("accept! revents=0x%08x\n", revents);
while (1) {
struct sockaddr_storage *sa;
Newx(sa,1,struct sockaddr_storage);
socklen_t sl = sizeof(struct sockaddr_storage);
int fd = accept(w->fd, (struct sockaddr *)sa, &sl);
if (fd == -1) break;
struct feer_conn *c = new_feer_conn(EV_A,fd,(struct sockaddr *)sa);
// XXX: good idea to read right away?
// try_conn_read(EV_A, &c->read_ev_io, EV_READ);
ev_io_start(EV_A, &c->read_ev_io);
}
}
static void
sched_request_callback (struct feer_conn *c)
{
trace("rinq push: c=%p, head=%p\n", c, request_ready_rinq);
rinq_push(&request_ready_rinq, c);
SvREFCNT_inc(c->self); // for the rinq
if (!ev_is_active(&ei)) {
ev_idle_start(feersum_ev_loop, &ei);
}
}
static bool
process_request_headers (struct feer_conn *c, int body_offset)
{
int err_code;
const char *err;
struct feer_req *req = c->req;
trace("processing headers %d minor_version=%d\n",c->fd,req->minor_version);
bool body_is_required;
c->is_http11 = (req->minor_version == 1);
c->receiving = RECEIVE_BODY;
if (str_eq("GET", 3, req->method, req->method_len) ||
str_eq("HEAD", 4, req->method, req->method_len) ||
str_eq("DELETE", 6, req->method, req->method_len))
{
// Not supposed to have a body. Additional bytes are either a mistake
// or pipelined requests under HTTP/1.1
// XXX ignore them for now
goto got_it_all;
}
else if (str_eq("PUT", 3, req->method, req->method_len) ||
str_eq("POST", 4, req->method, req->method_len))
{
// MUST have a body
body_is_required = 1;
}
else {
err = "Feersum doesn't support that method yet\n";
err_code = 405;
goto got_bad_request;
}
// a body potentially follows the headers. Let feer_req retain its
// pointers into rbuf and make a new scalar for more body data.
int need = SvCUR(c->rbuf) - body_offset;
char *from = SvPVX(c->rbuf) + body_offset;
SV *new_rbuf = newSV((need > 2*READ_CHUNK) ? need-1 : 2*READ_CHUNK-1);
if (need)
sv_setpvn(new_rbuf, from, need);
req->buf = c->rbuf;
c->rbuf = new_rbuf;
// determine how much we need to read
int i;
UV expected = 0;
for (i=0; i < req->num_headers; i++) {
struct phr_header *hdr = &req->headers[i];
if (!hdr->name) continue;
// XXX: ignore multiple C-L headers?
if (str_case_eq("content-length", 14, hdr->name, hdr->name_len)) {
int g = grok_number(hdr->value, hdr->value_len, &expected);
if (g == IS_NUMBER_IN_UV) {
if (expected > MAX_BODY_LENGTH) {
err_code = 413;
err = "Content length exceeds maximum\n";
goto got_bad_request;
}
else
goto got_cl;
}
else {
err_code = 400;
err = "invalid content-length\n";
goto got_bad_request;
}
}
// TODO: support "Connection: close" bodies
// TODO: support "Transfer-Encoding: chunked" bodies
}
if (body_is_required) {
// Go the nginx route...
err_code = 411;
err = "Content-Length required\n";
}
else {
// XXX TODO support requests that don't require a body
err_code = 418;
err = "Feersum doesn't know how to handle optional-body requests yet\n";
}
got_bad_request:
respond_with_server_error(c, err, 0, err_code);
return 0;
got_cl:
c->expected_cl = (ssize_t)expected;
c->received_cl = SvCUR(c->rbuf);
trace("expecting body %d size=%d have=%d\n",c->fd, c->expected_cl,c->received_cl);
// don't have enough bytes to schedule immediately?
if (c->expected_cl && c->received_cl < c->expected_cl) {
// TODO: schedule the callback immediately and support a non-blocking
// ->read method.
// sched_request_callback(c);
// c->receiving = RECEIVE_STREAM;
return 1;
}
// fallthrough: have enough bytes
got_it_all:
c->receiving = RECEIVE_SHUTDOWN;
shutdown(c->fd, SHUT_RD);
sched_request_callback(c);
return 0;
}
static void
conn_write_ready (struct feer_conn *c)
{
if (c->in_callback) return; // defer until out of callback
if (c->write_ev_io.data == NULL) {
ev_io_init(&c->write_ev_io, try_conn_write, c->fd, EV_WRITE);
c->write_ev_io.data = (void *)c;
}
if (!ev_is_active(&c->write_ev_io)) {
#if AUTOCORK_WRITES
ev_io_start(feersum_ev_loop, &c->write_ev_io);
#else
// attempt a non-blocking write immediately if we're not already
// waiting for writability
try_conn_write(feersum_ev_loop, &c->write_ev_io, EV_WRITE);