bugfix: failed to load socket.lua when building without ssl.

Author: zhuizhuhaomeng

lib/resty/core/socket.lua

@@ -90,8 +90,15 @@ ngx_http_lua_ffi_socket_tcp_get_ssl_ctx(ngx_http_request_t *r,
 ngx_lua_ffi_socket_tcp_getoption = C.ngx_http_lua_ffi_socket_tcp_getoption
 ngx_lua_ffi_socket_tcp_setoption = C.ngx_http_lua_ffi_socket_tcp_setoption
 ngx_lua_ffi_socket_getfd = C.ngx_http_lua_ffi_socket_tcp_getfd
+if pcall(function() return C.ngx_http_lua_ffi_socket_tcp_get_ssl_pointer end)
+then
 ngx_lua_ffi_socket_getsslpointer = C.ngx_http_lua_ffi_socket_tcp_get_ssl_pointer
+end
+
+if pcall(function() return C.ngx_http_lua_ffi_socket_tcp_get_ssl_ctx end) then
 ngx_lua_ffi_socket_getsslctx = C.ngx_http_lua_ffi_socket_tcp_get_ssl_ctx
+end
+
 
 elseif subsystem == 'stream' then
 
@@ -122,9 +129,15 @@ ngx_stream_lua_ffi_socket_tcp_get_ssl_ctx(ngx_stream_lua_request_t *r,
 ngx_lua_ffi_socket_tcp_getoption = C.ngx_stream_lua_ffi_socket_tcp_getoption
 ngx_lua_ffi_socket_tcp_setoption = C.ngx_stream_lua_ffi_socket_tcp_setoption
 ngx_lua_ffi_socket_getfd = C.ngx_stream_lua_ffi_socket_tcp_getfd
+if pcall(function() return C.ngx_stream_lua_ffi_socket_tcp_get_ssl_pointer end)
+then
 ngx_lua_ffi_socket_getsslpointer =
     C.ngx_stream_lua_ffi_socket_tcp_get_ssl_pointer
-ngx_lua_ffi_socket_getsslctx = C.ngx_stream_lua_ffi_socket_tcp_get_ssl_ctx
+end
+if pcall(function() return C.ngx_stream_lua_ffi_socket_tcp_get_ssl_pointer end)
+then
+ngx_lua_ffi_socket_getsslctx = C.ngx_stream_lua_ffi_socket_tcp_get_ssl_pointer
+end
 end