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Bufferevent removal: remove HAS_BUFFEREVENT macros and usage

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This is another way that we had bufferevents-only code marked.
This commit is contained in:
Nick Mathewson 2016-08-02 13:15:10 -04:00
parent 8e9a6543e1
commit c68a23a135
10 changed files with 22 additions and 204 deletions
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64
src/or/connection.c
View File

@ -575,15 +575,6 @@ connection_free_(connection_t *conn)
tor_event_free(conn->read_event);
tor_event_free(conn->write_event);
conn->read_event = conn->write_event = NULL;
IF_HAS_BUFFEREVENT(conn, {
/* This was a workaround to handle bugs in some old versions of libevent
* where callbacks can occur after calling bufferevent_free(). Setting
* the callbacks to NULL prevented this. It shouldn't be necessary any
* more, but let's not tempt fate for now. */
bufferevent_setcb(conn->bufev, NULL, NULL, NULL, NULL);
bufferevent_free(conn->bufev);
conn->bufev = NULL;
});
if (conn->type == CONN_TYPE_DIR) {
dir_connection_t *dir_conn = TO_DIR_CONN(conn);
@ -2220,12 +2211,7 @@ static int
connection_fetch_from_buf_socks_client(connection_t *conn,
int state, char **reason)
{
IF_HAS_BUFFEREVENT(conn, {
struct evbuffer *input = bufferevent_get_input(conn->bufev);
return fetch_from_evbuffer_socks_client(input, state, reason);
}) ELSE_IF_NO_BUFFEREVENT {
return fetch_from_buf_socks_client(conn->inbuf, state, reason);
}
}
/** Call this from connection_*_process_inbuf() to advance the proxy
@ -3570,12 +3556,7 @@ connection_read_to_buf(connection_t *conn, ssize_t *max_to_read,
int
connection_fetch_from_buf(char *string, size_t len, connection_t *conn)
{
IF_HAS_BUFFEREVENT(conn, {
/* XXX overflow -seb */
return (int)bufferevent_read(conn->bufev, string, len);
}) ELSE_IF_NO_BUFFEREVENT {
return fetch_from_buf(string, len, conn->inbuf);
}
}
/** As fetch_from_buf_line(), but read from a connection's input buffer. */
@ -3583,25 +3564,7 @@ int
connection_fetch_from_buf_line(connection_t *conn, char *data,
size_t *data_len)
{
IF_HAS_BUFFEREVENT(conn, {
int r;
size_t eol_len=0;
struct evbuffer *input = bufferevent_get_input(conn->bufev);
struct evbuffer_ptr ptr =
evbuffer_search_eol(input, NULL, &eol_len, EVBUFFER_EOL_LF);
if (ptr.pos == -1)
return 0; /* No EOL found. */
if ((size_t)ptr.pos+eol_len >= *data_len) {
return -1; /* Too long */
}
*data_len = ptr.pos+eol_len;
r = evbuffer_remove(input, data, ptr.pos+eol_len);
tor_assert(r >= 0);
data[ptr.pos+eol_len] = '\0';
return 1;
}) ELSE_IF_NO_BUFFEREVENT {
return fetch_from_buf_line(conn->inbuf, data, data_len);
}
}
/** As fetch_from_buf_http, but fetches from a connection's input buffer_t or
@ -3612,14 +3575,8 @@ connection_fetch_from_buf_http(connection_t *conn,
char **body_out, size_t *body_used,
size_t max_bodylen, int force_complete)
{
IF_HAS_BUFFEREVENT(conn, {
struct evbuffer *input = bufferevent_get_input(conn->bufev);
return fetch_from_evbuffer_http(input, headers_out, max_headerlen,
body_out, body_used, max_bodylen, force_complete);
}) ELSE_IF_NO_BUFFEREVENT {
return fetch_from_buf_http(conn->inbuf, headers_out, max_headerlen,
body_out, body_used, max_bodylen, force_complete);
}
}
/** Return conn-\>outbuf_flushlen: how many bytes conn wants to flush
@ -3931,10 +3888,6 @@ connection_handle_write(connection_t *conn, int force)
int
connection_flush(connection_t *conn)
{
IF_HAS_BUFFEREVENT(conn, {
int r = bufferevent_flush(conn->bufev, EV_WRITE, BEV_FLUSH);
return (r < 0) ? -1 : 0;
});
return connection_handle_write(conn, 1);
}
@ -3963,22 +3916,6 @@ connection_write_to_buf_impl_,(const char *string, size_t len,
if (conn->marked_for_close && !conn->hold_open_until_flushed)
return;
IF_HAS_BUFFEREVENT(conn, {
if (zlib) {
int done = zlib < 0;
r = write_to_evbuffer_zlib(bufferevent_get_output(conn->bufev),
TO_DIR_CONN(conn)->zlib_state,
string, len, done);
} else {
r = bufferevent_write(conn->bufev, string, len);
}
if (r < 0) {
/* XXXX mark for close? */
log_warn(LD_NET, "bufferevent_write failed! That shouldn't happen.");
}
return;
});
old_datalen = buf_datalen(conn->outbuf);
if (zlib) {
dir_connection_t *dir_conn = TO_DIR_CONN(conn);
@ -4441,7 +4378,6 @@ connection_finished_flushing(connection_t *conn)
// log_fn(LOG_DEBUG,"entered. Socket %u.", conn->s);
IF_HAS_NO_BUFFEREVENT(conn)
connection_stop_writing(conn);
switch (conn->type) {

10
src/or/connection.h
View File

@ -57,8 +57,6 @@ void connection_mark_for_close_internal_(connection_t *conn,
connection_t *tmp_conn_ = (c); \
connection_mark_for_close_internal_(tmp_conn_, (line), (file)); \
tmp_conn_->hold_open_until_flushed = 1; \
IF_HAS_BUFFEREVENT(tmp_conn_, \
connection_start_writing(tmp_conn_)); \
} while (0)
#define connection_mark_and_flush_internal(c) \
@ -166,21 +164,13 @@ static size_t connection_get_outbuf_len(connection_t *conn);
static inline size_t
connection_get_inbuf_len(connection_t *conn)
{
IF_HAS_BUFFEREVENT(conn, {
return evbuffer_get_length(bufferevent_get_input(conn->bufev));
}) ELSE_IF_NO_BUFFEREVENT {
return conn->inbuf ? buf_datalen(conn->inbuf) : 0;
}
}
static inline size_t
connection_get_outbuf_len(connection_t *conn)
{
IF_HAS_BUFFEREVENT(conn, {
return evbuffer_get_length(bufferevent_get_output(conn->bufev));
}) ELSE_IF_NO_BUFFEREVENT {
return conn->outbuf ? buf_datalen(conn->outbuf) : 0;
}
}
connection_t *connection_get_by_global_id(uint64_t id);

9
src/or/connection_edge.c
View File

@ -478,7 +478,6 @@ connection_edge_finished_connecting(edge_connection_t *edge_conn)
rep_hist_note_exit_stream_opened(conn->port);
conn->state = EXIT_CONN_STATE_OPEN;
IF_HAS_NO_BUFFEREVENT(conn)
connection_watch_events(conn, READ_EVENT); /* stop writing, keep reading */
if (connection_get_outbuf_len(conn)) /* in case there are any queued relay
* cells */
@ -2008,14 +2007,8 @@ connection_ap_handshake_process_socks(entry_connection_t *conn)
log_debug(LD_APP,"entered.");
IF_HAS_BUFFEREVENT(base_conn, {
struct evbuffer *input = bufferevent_get_input(base_conn->bufev);
sockshere = fetch_from_evbuffer_socks(input, socks,
options->TestSocks, options->SafeSocks);
}) ELSE_IF_NO_BUFFEREVENT {
sockshere = fetch_from_buf_socks(base_conn->inbuf, socks,
options->TestSocks, options->SafeSocks);
};
if (socks->replylen) {
had_reply = 1;
@ -3225,10 +3218,8 @@ connection_exit_connect(edge_connection_t *edge_conn)
conn->state = EXIT_CONN_STATE_OPEN;
if (connection_get_outbuf_len(conn)) {
/* in case there are any queued data cells, from e.g. optimistic data */
IF_HAS_NO_BUFFEREVENT(conn)
connection_watch_events(conn, READ_EVENT|WRITE_EVENT);
} else {
IF_HAS_NO_BUFFEREVENT(conn)
connection_watch_events(conn, READ_EVENT);
}

14
src/or/connection_or.c
View File

@ -1361,12 +1361,9 @@ connection_tls_start_handshake,(or_connection_t *conn, int receiving))
conn->base_.s);
note_crypto_pk_op(receiving ? TLS_HANDSHAKE_S : TLS_HANDSHAKE_C);
IF_HAS_BUFFEREVENT(TO_CONN(conn), {
/* ???? */;
}) ELSE_IF_NO_BUFFEREVENT {
if (connection_tls_continue_handshake(conn) < 0)
return -1;
}
return 0;
}
@ -1872,11 +1869,7 @@ connection_or_set_state_open(or_connection_t *conn)
or_handshake_state_free(conn->handshake_state);
conn->handshake_state = NULL;
IF_HAS_BUFFEREVENT(TO_CONN(conn), {
connection_watch_events(TO_CONN(conn), READ_EVENT|WRITE_EVENT);
}) ELSE_IF_NO_BUFFEREVENT {
connection_start_reading(TO_CONN(conn));
}
return 0;
}
@ -1936,12 +1929,7 @@ static int
connection_fetch_var_cell_from_buf(or_connection_t *or_conn, var_cell_t **out)
{
connection_t *conn = TO_CONN(or_conn);
IF_HAS_BUFFEREVENT(conn, {
struct evbuffer *input = bufferevent_get_input(conn->bufev);
return fetch_var_cell_from_evbuffer(input, out, or_conn->link_proto);
}) ELSE_IF_NO_BUFFEREVENT {
return fetch_var_cell_from_buf(conn->inbuf, out, or_conn->link_proto);
}
}
/** Process cells from <b>conn</b>'s inbuf.

5
src/or/control.c
View File

@ -4798,12 +4798,7 @@ is_valid_initial_command(control_connection_t *conn, const char *cmd)
static int
peek_connection_has_control0_command(connection_t *conn)
{
IF_HAS_BUFFEREVENT(conn, {
struct evbuffer *input = bufferevent_get_input(conn->bufev);
return peek_evbuffer_has_control0_command(input);
}) ELSE_IF_NO_BUFFEREVENT {
return peek_buf_has_control0_command(conn->inbuf);
}
}
/** Called when data has arrived on a v1 control connection: Try to fetch

4
src/or/directory.c
View File

@ -1272,10 +1272,6 @@ directory_initiate_command_rend(const tor_addr_port_t *or_addr_port,
if_modified_since);
connection_watch_events(TO_CONN(conn), READ_EVENT|WRITE_EVENT);
IF_HAS_BUFFEREVENT(ENTRY_TO_CONN(linked_conn), {
connection_watch_events(ENTRY_TO_CONN(linked_conn),
READ_EVENT|WRITE_EVENT);
}) ELSE_IF_NO_BUFFEREVENT
connection_start_reading(ENTRY_TO_CONN(linked_conn));
}
}

5
src/or/ext_orport.c
View File

@ -41,12 +41,7 @@ ext_or_cmd_free(ext_or_cmd_t *cmd)
static int
connection_fetch_ext_or_cmd_from_buf(connection_t *conn, ext_or_cmd_t **out)
{
IF_HAS_BUFFEREVENT(conn, {
struct evbuffer *input = bufferevent_get_input(conn->bufev);
return fetch_ext_or_command_from_evbuffer(input, out);
}) ELSE_IF_NO_BUFFEREVENT {
return fetch_ext_or_command_from_buf(conn->inbuf, out);
}
}
/** Write an Extended ORPort message to <b>conn</b>. Use

41
src/or/main.c
View File

@ -225,7 +225,7 @@ connection_add_impl(connection_t *conn, int is_connecting)
(void) is_connecting;
if (!HAS_BUFFEREVENT(conn) && (SOCKET_OK(conn->s) || conn->linked)) {
if (SOCKET_OK(conn->s) || conn->linked) {
conn->read_event = tor_event_new(tor_libevent_get_base(),
conn->s, EV_READ|EV_PERSIST, conn_read_callback, conn);
conn->write_event = tor_event_new(tor_libevent_get_base(),
@ -413,17 +413,6 @@ get_bytes_written,(void))
void
connection_watch_events(connection_t *conn, watchable_events_t events)
{
IF_HAS_BUFFEREVENT(conn, {
short ev = ((short)events) & (EV_READ|EV_WRITE);
short old_ev = bufferevent_get_enabled(conn->bufev);
if ((ev & ~old_ev) != 0) {
bufferevent_enable(conn->bufev, ev);
}
if ((old_ev & ~ev) != 0) {
bufferevent_disable(conn->bufev, old_ev & ~ev);
}
return;
});
if (events & READ_EVENT)
connection_start_reading(conn);
else
@ -441,9 +430,6 @@ connection_is_reading(connection_t *conn)
{
tor_assert(conn);
IF_HAS_BUFFEREVENT(conn,
return (bufferevent_get_enabled(conn->bufev) & EV_READ) != 0;
);
return conn->reading_from_linked_conn ||
(conn->read_event && event_pending(conn->read_event, EV_READ, NULL));
}
@ -494,11 +480,6 @@ connection_stop_reading,(connection_t *conn))
{
tor_assert(conn);
IF_HAS_BUFFEREVENT(conn, {
bufferevent_disable(conn->bufev, EV_READ);
return;
});
if (connection_check_event(conn, conn->read_event) < 0) {
return;
}
@ -521,11 +502,6 @@ connection_start_reading,(connection_t *conn))
{
tor_assert(conn);
IF_HAS_BUFFEREVENT(conn, {
bufferevent_enable(conn->bufev, EV_READ);
return;
});
if (connection_check_event(conn, conn->read_event) < 0) {
return;
}
@ -549,10 +525,6 @@ connection_is_writing(connection_t *conn)
{
tor_assert(conn);
IF_HAS_BUFFEREVENT(conn,
return (bufferevent_get_enabled(conn->bufev) & EV_WRITE) != 0;
);
return conn->writing_to_linked_conn ||
(conn->write_event && event_pending(conn->write_event, EV_WRITE, NULL));
}
@ -563,11 +535,6 @@ connection_stop_writing,(connection_t *conn))
{
tor_assert(conn);
IF_HAS_BUFFEREVENT(conn, {
bufferevent_disable(conn->bufev, EV_WRITE);
return;
});
if (connection_check_event(conn, conn->write_event) < 0) {
return;
}
@ -591,11 +558,6 @@ connection_start_writing,(connection_t *conn))
{
tor_assert(conn);
IF_HAS_BUFFEREVENT(conn, {
bufferevent_enable(conn->bufev, EV_WRITE);
return;
});
if (connection_check_event(conn, conn->write_event) < 0) {
return;
}
@ -793,7 +755,6 @@ conn_close_if_marked(int i)
if (conn->proxy_state == PROXY_INFANT)
log_failed_proxy_connection(conn);
IF_HAS_BUFFEREVENT(conn, goto unlink);
if ((SOCKET_OK(conn->s) || conn->linked_conn) &&
connection_wants_to_flush(conn)) {
/* s == -1 means it's an incomplete edge connection, or that the socket

34
src/or/or.h
View File

@ -1826,40 +1826,6 @@ static inline listener_connection_t *TO_LISTENER_CONN(connection_t *c)
return DOWNCAST(listener_connection_t, c);
}
/* Conditional macros to help write code that works whether bufferevents are
disabled or not.
We can't just write:
if (conn->bufev) {
do bufferevent stuff;
} else {
do other stuff;
}
because the bufferevent stuff won't even compile unless we have a fairly
new version of Libevent. Instead, we say:
IF_HAS_BUFFEREVENT(conn, { do_bufferevent_stuff } );
or:
IF_HAS_BUFFEREVENT(conn, {
do bufferevent stuff;
}) ELSE_IF_NO_BUFFEREVENT {
do non-bufferevent stuff;
}
If we're compiling with bufferevent support, then the macros expand more or
less to:
if (conn->bufev) {
do_bufferevent_stuff;
} else {
do non-bufferevent stuff;
}
and if we aren't using bufferevents, they expand more or less to:
{ do non-bufferevent stuff; }
*/
#define HAS_BUFFEREVENT(c) (0)
#define IF_HAS_BUFFEREVENT(c, stmt) (void)0
#define ELSE_IF_NO_BUFFEREVENT ;
#define IF_HAS_NO_BUFFEREVENT(c) \
if (1)
/** What action type does an address policy indicate: accept or reject? */
typedef enum {
ADDR_POLICY_ACCEPT=1,

2
src/or/relay.c
View File

@ -2525,7 +2525,7 @@ set_streams_blocked_on_circ(circuit_t *circ, channel_t *chan,
edge->edge_blocked_on_circ = block;
}
if (!conn->read_event && !HAS_BUFFEREVENT(conn)) {
if (!conn->read_event) {
/* This connection is a placeholder for something; probably a DNS
* request. It can't actually stop or start reading.*/
continue;