Bufferevent removal: remove HAS_BUFFEREVENT macros and usage

This is another way that we had bufferevents-only code marked.

src/or/connection.c

@@ -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);
-  }
+  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);
-  }
+  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);
-  }
+  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 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);
@@ -4441,8 +4378,7 @@ connection_finished_flushing(connection_t *conn)
 
 //  log_fn(LOG_DEBUG,"entered. Socket %u.", conn->s);
 
-  IF_HAS_NO_BUFFEREVENT(conn)
-    connection_stop_writing(conn);
+  connection_stop_writing(conn);
 
   switch (conn->type) {
     case CONN_TYPE_OR:

src/or/connection.h

@@ -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;
-  }
+  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);

src/or/connection_edge.c

@@ -478,8 +478,7 @@ 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 */
+  connection_watch_events(conn, READ_EVENT); /* stop writing, keep reading */
   if (connection_get_outbuf_len(conn)) /* in case there are any queued relay
                                         * cells */
     connection_start_writing(conn);
@@ -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);
-  };
+  sockshere = fetch_from_buf_socks(base_conn->inbuf, socks,
+                                   options->TestSocks, options->SafeSocks);
 
   if (socks->replylen) {
     had_reply = 1;
@@ -3225,11 +3218,9 @@ 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);
+    connection_watch_events(conn, READ_EVENT|WRITE_EVENT);
   } else {
-    IF_HAS_NO_BUFFEREVENT(conn)
-      connection_watch_events(conn, READ_EVENT);
+    connection_watch_events(conn, READ_EVENT);
   }
 
   /* also, deliver a 'connected' cell back through the circuit. */

src/or/connection_or.c

@@ -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;
-  }
+  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));
-  }
+  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);
-  }
+  return fetch_var_cell_from_buf(conn->inbuf, out, or_conn->link_proto);
 }
 
 /** Process cells from <b>conn</b>'s inbuf.

src/or/control.c

@@ -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);
-  }
+  return peek_buf_has_control0_command(conn->inbuf);
 }
 
 /** Called when data has arrived on a v1 control connection: Try to fetch

src/or/directory.c

@@ -1272,11 +1272,7 @@ 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));
+    connection_start_reading(ENTRY_TO_CONN(linked_conn));
   }
 }
 

src/or/ext_orport.c

@@ -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);
-  }
+  return fetch_ext_or_command_from_buf(conn->inbuf, out);
 }
 
 /** Write an Extended ORPort message to <b>conn</b>. Use

src/or/main.c

@@ -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

src/or/or.h

@@ -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,

src/or/relay.c

@@ -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;