/* * Copyright (C) Igor Sysoev * Copyright (C) NGINX, Inc. */ #ifndef _NXT_CONN_H_INCLUDED_ #define _NXT_CONN_H_INCLUDED_ typedef ssize_t (*nxt_conn_io_read_t)(nxt_task_t *task, nxt_conn_t *c); typedef nxt_msec_t (*nxt_conn_timer_value_t)(nxt_conn_t *c, uintptr_t data); typedef struct { nxt_work_handler_t ready_handler; nxt_work_handler_t close_handler; nxt_work_handler_t error_handler; nxt_conn_io_read_t io_read_handler; nxt_work_handler_t timer_handler; nxt_conn_timer_value_t timer_value; uintptr_t timer_data; uint8_t timer_autoreset; } nxt_conn_state_t; typedef struct { double average; size_t limit; size_t limit_after; size_t max_limit; nxt_msec_t last; } nxt_event_write_rate_t; typedef struct { nxt_work_handler_t connect; nxt_work_handler_t accept; /* * The read() with NULL c->read buffer waits readiness of a connection * to avoid allocation of read buffer if the connection will time out * or will be closed with error. The kqueue-specific read() can also * detect case if a client did not sent anything and has just closed the * connection without errors. In the latter case state's close_handler * is called. */ nxt_work_handler_t read; ssize_t (*recvbuf)(nxt_conn_t *c, nxt_buf_t *b); ssize_t (*recv)(nxt_conn_t *c, void *buf, size_t size, nxt_uint_t flags); /* The write() is an interface to write a buffer chain. */ nxt_work_handler_t write; /* * The sendbuf() is an interface for OS-specific sendfile * implementations or simple writev(). */ ssize_t (*sendbuf)(nxt_task_t *task, nxt_sendbuf_t *sb); /* * The sendbuf() is an interface for OS-specific sendfile * implementations or simple writev(). */ ssize_t (*old_sendbuf)(nxt_conn_t *c, nxt_buf_t *b, size_t limit); /* * The writev() is an interface to write several nxt_iobuf_t buffers. */ ssize_t (*writev)(nxt_conn_t *c, nxt_iobuf_t *iob, nxt_uint_t niob); /* * The send() is an interface to write a single buffer. SSL/TLS * libraries' send() interface handles also the libraries' errors. */ ssize_t (*send)(nxt_conn_t *c, void *buf, size_t size); nxt_work_handler_t shutdown; } nxt_conn_io_t; /* * The nxt_listen_event_t is separated from nxt_listen_socket_t * because nxt_listen_socket_t is one per process whilst each worker * thread uses own nxt_listen_event_t. */ typedef struct { /* Must be the first field. */ nxt_fd_event_t socket; nxt_task_t task; uint32_t ready; uint32_t batch; uint32_t count; /* An accept() interface is cached to minimize memory accesses. */ nxt_work_handler_t accept; nxt_listen_socket_t *listen; nxt_conn_t *next; nxt_work_queue_t *work_queue; nxt_timer_t timer; nxt_queue_link_t link; } nxt_listen_event_t; struct nxt_conn_s { /* * Must be the first field, since nxt_fd_event_t * and nxt_conn_t are used interchangeably. */ nxt_fd_event_t socket; nxt_buf_t *read; const nxt_conn_state_t *read_state; nxt_work_queue_t *read_work_queue; nxt_timer_t read_timer; nxt_buf_t *write; const nxt_conn_state_t *write_state; nxt_work_queue_t *write_work_queue; nxt_event_write_rate_t *rate; nxt_timer_t write_timer; nxt_off_t sent; uint32_t max_chunk; uint32_t nbytes; nxt_conn_io_t *io; union { #if (NXT_TLS) void *tls; #endif nxt_thread_pool_t *thread_pool; } u; nxt_mp_t *mem_pool; nxt_task_t task; nxt_log_t log; nxt_listen_event_t *listen; nxt_sockaddr_t *remote; nxt_sockaddr_t *local; const char *action; uint8_t block_read; /* 1 bit */ uint8_t block_write; /* 1 bit */ uint8_t delayed; /* 1 bit */ uint8_t idle; /* 1 bit */ #define NXT_CONN_SENDFILE_OFF 0 #define NXT_CONN_SENDFILE_ON 1 #define NXT_CONN_SENDFILE_UNSET 3 uint8_t sendfile; /* 2 bits */ uint8_t tcp_nodelay; /* 1 bit */ nxt_queue_link_t link; }; #define nxt_conn_timer_init(ev, c, wq) \ do { \ (ev)->work_queue = (wq); \ (ev)->log = &(c)->log; \ (ev)->bias = NXT_TIMER_DEFAULT_BIAS; \ } while (0) #define nxt_read_timer_conn(ev) \ nxt_timer_data(ev, nxt_conn_t, read_timer) #define nxt_write_timer_conn(ev) \ nxt_timer_data(ev, nxt_conn_t, write_timer) #if (NXT_HAVE_UNIX_DOMAIN) #define nxt_conn_tcp_nodelay_on(task, c) \ do { \ nxt_int_t ret; \ \ if ((c)->remote->u.sockaddr.sa_family != AF_UNIX) { \ ret = nxt_socket_setsockopt(task, (c)->socket.fd, IPPROTO_TCP, \ TCP_NODELAY, 1); \ \ (c)->tcp_nodelay = (ret == NXT_OK); \ } \ } while (0) #else #define nxt_conn_tcp_nodelay_on(task, c) \ do { \ nxt_int_t ret; \ \ ret = nxt_socket_setsockopt(task, (c)->socket.fd, IPPROTO_TCP, \ TCP_NODELAY, 1); \ \ (c)->tcp_nodelay = (ret == NXT_OK); \ } while (0) #endif NXT_EXPORT nxt_conn_t *nxt_conn_create(nxt_mp_t *mp, nxt_task_t *task); NXT_EXPORT void nxt_conn_free(nxt_task_t *task, nxt_conn_t *c); NXT_EXPORT void nxt_conn_close(nxt_event_engine_t *engine, nxt_conn_t *c); NXT_EXPORT void nxt_conn_timer(nxt_event_engine_t *engine, nxt_conn_t *c, const nxt_conn_state_t *state, nxt_timer_t *tev); NXT_EXPORT void nxt_conn_work_queue_set(nxt_conn_t *c, nxt_work_queue_t *wq); NXT_EXPORT nxt_sockaddr_t *nxt_conn_local_addr(nxt_task_t *task, nxt_conn_t *c); void nxt_conn_sys_socket(nxt_task_t *task, void *obj, void *data); void nxt_conn_io_connect(nxt_task_t *task, void *obj, void *data); nxt_int_t nxt_conn_socket(nxt_task_t *task, nxt_conn_t *c); void nxt_conn_connect_test(nxt_task_t *task, void *obj, void *data); void nxt_conn_connect_error(nxt_task_t *task, void *obj, void *data); NXT_EXPORT nxt_listen_event_t *nxt_listen_event(nxt_task_t *task, nxt_listen_socket_t *ls); void nxt_conn_io_accept(nxt_task_t *task, void *obj, void *data); NXT_EXPORT void nxt_conn_accept(nxt_task_t *task, nxt_listen_event_t *lev, nxt_conn_t *c); void nxt_conn_accept_error(nxt_task_t *task, nxt_listen_event_t *lev, const char *accept_syscall, nxt_err_t err); void nxt_conn_wait(nxt_conn_t *c); void nxt_conn_io_read(nxt_task_t *task, void *obj, void *data); ssize_t nxt_conn_io_recvbuf(nxt_conn_t *c, nxt_buf_t *b); ssize_t nxt_conn_io_recv(nxt_conn_t *c, void *buf, size_t size, nxt_uint_t flags); void nxt_conn_io_write(nxt_task_t *task, void *obj, void *data); ssize_t nxt_conn_io_sendbuf(nxt_task_t *task, nxt_sendbuf_t *sb); ssize_t nxt_conn_io_writev(nxt_task_t *task, nxt_sendbuf_t *sb, nxt_iobuf_t *iob, nxt_uint_t niob); ssize_t nxt_conn_io_send(nxt_task_t *task, nxt_sendbuf_t *sb, void *buf, size_t size); size_t nxt_event_conn_write_limit(nxt_conn_t *c); nxt_bool_t nxt_event_conn_write_delayed(nxt_event_engine_t *engine, nxt_conn_t *c, size_t sent); ssize_t nxt_event_conn_io_writev(nxt_conn_t *c, nxt_iobuf_t *iob, nxt_uint_t niob); ssize_t nxt_event_conn_io_send(nxt_conn_t *c, void *buf, size_t size); NXT_EXPORT void nxt_event_conn_job_sendfile(nxt_task_t *task, nxt_conn_t *c); #define nxt_conn_connect(engine, c) \ nxt_work_queue_add(&engine->socket_work_queue, nxt_conn_sys_socket, \ c->socket.task, c, c->socket.data) #define nxt_conn_read(engine, c) \ do { \ nxt_event_engine_t *e = engine; \ \ c->socket.read_work_queue = &e->read_work_queue; \ \ nxt_work_queue_add(&e->read_work_queue, c->io->read, \ c->socket.task, c, c->socket.data); \ } while (0) #define nxt_conn_write(engine, c) \ do { \ nxt_event_engine_t *e = engine; \ \ c->socket.write_work_queue = &e->write_work_queue; \ \ nxt_work_queue_add(&e->write_work_queue, c->io->write, \ c->socket.task, c, c->socket.data); \ } while (0) #define nxt_conn_idle(engine, c) \ do { \ nxt_event_engine_t *e = engine; \ \ nxt_queue_insert_head(&e->idle_connections, &c->link); \ \ c->idle = 1; \ e->idle_conns_cnt++; \ } while (0) #define nxt_conn_active(engine, c) \ do { \ nxt_event_engine_t *e = engine; \ \ nxt_queue_remove(&c->link); \ \ e->idle_conns_cnt -= c->idle; \ } while (0) extern nxt_conn_io_t nxt_unix_conn_io; typedef struct { /* * Client and peer connections are not embedded because already * existent connections can be switched to the event connection proxy. */ nxt_conn_t *client; nxt_conn_t *peer; nxt_buf_t *client_buffer; nxt_buf_t *peer_buffer; size_t client_buffer_size; size_t peer_buffer_size; nxt_msec_t client_wait_timeout; nxt_msec_t connect_timeout; nxt_msec_t reconnect_timeout; nxt_msec_t peer_wait_timeout; nxt_msec_t client_write_timeout; nxt_msec_t peer_write_timeout; uint8_t connected; /* 1 bit */ uint8_t delayed; /* 1 bit */ uint8_t retries; /* 8 bits */ uint8_t retain; /* 2 bits */ nxt_work_handler_t completion_handler; } nxt_conn_proxy_t; NXT_EXPORT nxt_conn_proxy_t *nxt_conn_proxy_create(nxt_conn_t *c); NXT_EXPORT void nxt_conn_proxy(nxt_task_t *task, nxt_conn_proxy_t *p); /* STUB */ #define nxt_event_conn_t nxt_conn_t #define nxt_event_conn_state_t nxt_conn_state_t #define nxt_event_conn_proxy_t nxt_conn_proxy_t #define nxt_event_conn_read nxt_conn_read #define nxt_event_conn_write nxt_conn_write #define nxt_event_conn_close nxt_conn_close #endif /* _NXT_CONN_H_INCLUDED_ */